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gst-gmyth/nuvdemux/gstnuvdemux.c
author renatofilho
Fri Aug 03 15:37:32 2007 +0100 (2007-08-03)
branchtrunk
changeset 793 45c799bef1f6
parent 751 3cf3c6019e3b
child 822 c517a78bf7bf
permissions -rw-r--r--
[svn r799] -fixed volume compability with playbin; -Enable compile without gmyth dep; 
     1 /*

     2  * GStreamer Copyright (C) <2006> Renato Araujo Oliveira Filho

     3  * <renato.filho@indt.org.br> Rosfran Borges <rosfran.borges@indt.org.br>

     4  * This library is free software; you can redistribute it and/or modify it

     5  * under the terms of the GNU Library General Public License as published

     6  * by the Free Software Foundation; either version 2 of the License, or (at 

     7  * your option) any later version. This library is distributed in the hope 

     8  * that it will be useful, but WITHOUT ANY WARRANTY; without even the

     9  * implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 

    10  * See the GNU Library General Public License for more details. You should 

    11  * have received a copy of the GNU Library General Public License along

    12  * with this library; if not, write to the Free Software Foundation, Inc.,

    13  * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 

    14  */

    15 /*

    16  * Element-Checklist-Version: 5 

    17  */

    18 

    19 /**

    20  * SECTION:element-nuvdemux

    21  *

    22  * <refsect2>

    23  * <para>

    24  * Demuxes an .nuv file into raw or compressed audio and/or video streams.

    25  * </para>

    26  * <para>

    27  * This element currently only supports pull-based scheduling.

    28  * </para>

    29  * <title>Example launch line</title>

    30  * <para>

    31  * <programlisting>

    32  * gst-launch filesrc test.nuv ! nuvdemux name=demux  demux.audio_00 ! decodebin ! audioconvert ! audioresample ! autoaudiosink   demux.video_00 ! queue ! decodebin ! ffmpegcolorspace ! videoscale ! autovideosink

    33  * </programlisting>

    34  * Play (parse and decode) an .nuv file and try to output it to

    35  * an automatically detected soundcard and videosink. If the NUV file contains

    36  * compressed audio or video data, this will only work if you have the

    37  * right decoder elements/plugins installed.

    38  * </para>

    39  * </refsect2>

    40  *

    41  */

    42 

    43 #ifdef HAVE_CONFIG_H

    44 #include "config.h"

    45 #endif

    46 

    47 #include <gst/gst.h>

    48 #include <gst/gsterror.h>

    49 #include <gst/gstplugin.h>

    50 #include <string.h>

    51 #include <math.h>

    52 

    53 #include "glib/gi18n.h"

    54 #include "gstnuvdemux.h"

    55 

    56 #define GST_NUV_DEMUX_GET_PRIVATE(obj) (G_TYPE_INSTANCE_GET_PRIVATE ((obj), GST_TYPE_NUV_DEMUX, GstNuvDemuxPrivate))

    57 

    58 GST_DEBUG_CATEGORY_STATIC(nuvdemux_debug);

    59 #define GST_CAT_DEFAULT nuvdemux_debug

    60 #define GST_FLOW_ERROR_NO_DATA  -101

    61 #define GST_FLOW_ERROR_EOS	-102

    62 

    63 enum {

    64     NUV_PUSH_MODE = 0,

    65     NUV_PULL_MODE

    66 };

    67 

    68 GST_DEBUG_CATEGORY_EXTERN(GST_CAT_EVENT);

    69 

    70 static const GstElementDetails gst_nuv_demux_details =

    71 GST_ELEMENT_DETAILS("Nuv demuxer",

    72                     "Codec/Demuxer",

    73                     "Demultiplex a .nuv file into audio and video",

    74                     "Renato Araujo Oliveira Filho <renato.filho@indt.org.br>,"

    75                     "Rosfran Borges <rosfran.borges@indt.org.br>");

    76 

    77 

    78 /*

    79  * file header 

    80  */

    81 typedef struct {

    82     gchar           id[12];     /* "NuppelVideo\0" or "MythTVVideo\0" */

    83     gchar           version[5]; /* "x.xx\0" */

    84 

    85     gint            i_width;

    86     gint            i_height;

    87     gint            i_width_desired;

    88     gint            i_height_desired;

    89 

    90     gchar           i_mode;     /* P progressive, I interlaced */

    91 

    92     gdouble         d_aspect;   /* 1.0 squared pixel */

    93     gdouble         d_fps;

    94     // fps num/denom

    95     gint            i_fpsn;

    96     gint            i_fpsd;

    97 

    98     gint            i_video_blocks; /* 0 no video, -1 unknown */

    99     gint            i_audio_blocks;

   100     gint            i_text_blocks;

   101 

   102     gint            i_keyframe_distance;

   103 

   104 } nuv_header;

   105 

   106 /*

   107  * frame header 

   108  */

   109 typedef struct {

   110     gchar           i_type;     /* A: audio, V: video, S: sync; T: test R: 

   111                                  * Seekpoint (string:RTjjjjjjjj) D: Extra

   112                                  * data for codec */

   113     gchar           i_compression;  /* V: 0 uncompressed 1 RTJpeg 2

   114                                      * RTJpeg+lzo N black frame L copy

   115                                      * last A: 0 uncompressed (44100

   116                                      * 1-bits, 2ch) 1 lzo 2 layer 2 3

   117                                      * layer 3 F flac S shorten N null

   118                                      * frame loudless L copy last S: B

   119                                      * audio and vdeo sync point A audio

   120                                      * sync info (timecode == effective

   121                                      * dsp frequency*100) V next video

   122                                      * sync (timecode == next video frame

   123                                      * num) S audio,video,text correlation 

   124                                      */

   125     gchar           i_keyframe; /* 0 keyframe, else no no key frame */

   126     guint8          i_filters;  /* 0x01: gauss 5 pixel (8,2,2,2,2)/16

   127                                  * 0x02: gauss 5 pixel (8,1,1,1,1)/12

   128                                  * 0x04: cartoon filter */

   129 

   130     gint32          i_timecode; /* ms */

   131 

   132     gint            i_length;   /* V,A,T: length of following data S:

   133                                  * length of packet correl */

   134 } nuv_frame_header;

   135 

   136 

   137 /*

   138  * FIXME Not sure of this one 

   139  */

   140 typedef struct {

   141     gint            i_version;

   142     guint32         i_video_fcc;

   143 

   144     guint32         i_audio_fcc;

   145     gint            i_audio_sample_rate;

   146     gint            i_audio_bits_per_sample;

   147     gint            i_audio_channels;

   148     gint            i_audio_compression_ratio;

   149     gint            i_audio_quality;

   150     gint            i_rtjpeg_quality;

   151     gint            i_rtjpeg_luma_filter;

   152     gint            i_rtjpeg_chroma_filter;

   153     gint            i_lavc_bitrate;

   154     gint            i_lavc_qmin;

   155     gint            i_lavc_qmax;

   156     gint            i_lavc_maxqdiff;

   157     gint64          i_seekable_offset;

   158     gint64          i_keyframe_adjust_offset;

   159 

   160 } nuv_extended_header;

   161 

   162 typedef struct {

   163     gint64          timecode;

   164     gint64          offset;

   165 

   166 } frame_index_data;

   167 

   168 typedef enum {

   169     GST_NUV_DEMUX_START,

   170     GST_NUV_DEMUX_HEADER_DATA,

   171     GST_NUV_DEMUX_EXTRA_DATA,

   172     GST_NUV_DEMUX_MPEG_DATA,

   173     GST_NUV_DEMUX_EXTEND_HEADER,

   174     GST_NUV_DEMUX_EXTEND_HEADER_DATA,

   175     GST_NUV_DEMUX_INDEX_CREATE,

   176     GST_NUV_DEMUX_FRAME_HEADER,

   177     GST_NUV_DEMUX_MOVI,

   178     GST_NUV_DEMUX_INVALID_DATA

   179 } GstNuvDemuxState;

   180 

   181 struct _GstNuvDemuxPrivate {

   182     /*

   183      * used for indicate the mode 

   184      */

   185     guint           mode;

   186 

   187     /*

   188      * used on push mode 

   189      */

   190     GstAdapter     *adapter;

   191 

   192     /*

   193      * pads 

   194      */

   195     GstPad         *sinkpad;

   196     GstPad         *src_video_pad;

   197     GstPad         *src_audio_pad;

   198 

   199     /*

   200      * Flow control 

   201      */

   202     GstFlowReturn   last_video_return;

   203     GstFlowReturn   last_audio_return;

   204     gboolean        more_data;

   205     gboolean        eos;

   206     gboolean        new_file;

   207     guint           segment;

   208 

   209     /*

   210      * NUV decoding state 

   211      */

   212     GstNuvDemuxState state;

   213     guint64         offset;

   214 

   215     /*

   216      * duration information 

   217      */

   218     guint64         duration_bytes;

   219     guint64         duration_time;

   220     guint64         segment_stop;

   221     guint64         segment_start;

   222 

   223     /*

   224      * segment control info 

   225      */

   226     gboolean        new_audio_segment;

   227     gboolean        new_video_segment;

   228 

   229     /*

   230      * Mpeg ExtraData 

   231      */

   232     guint64         mpeg_data_size;

   233     GstBuffer      *mpeg_buffer;

   234 

   235     /*

   236      * Headers 

   237      */

   238     nuv_header      h;

   239     nuv_extended_header eh;

   240     nuv_frame_header fh;

   241 

   242     /*

   243      * anothers info 

   244      */

   245     guint64         header_lengh;

   246     gint64          time_start;

   247     gint64          time_diff;

   248     gint64          time_qos;

   249     guint64         last_frame_time;

   250     GSList         *index;

   251 };

   252 

   253 

   254 static GstStaticPadTemplate sink_template = GST_STATIC_PAD_TEMPLATE("sink",

   255                                                                     GST_PAD_SINK,

   256                                                                     GST_PAD_ALWAYS,

   257                                                                     GST_STATIC_CAPS

   258                                                                     ("video/x-nuv"));

   259 

   260 static GstStaticPadTemplate audio_src_template =

   261 GST_STATIC_PAD_TEMPLATE("audio_src",

   262                         GST_PAD_SRC,

   263                         GST_PAD_SOMETIMES,

   264                         GST_STATIC_CAPS_ANY);

   265 

   266 static GstStaticPadTemplate video_src_template =

   267 GST_STATIC_PAD_TEMPLATE("video_src",

   268                         GST_PAD_SRC,

   269                         GST_PAD_SOMETIMES,

   270                         GST_STATIC_CAPS_ANY);

   271 

   272 static void     gst_nuv_demux_dispose(GObject * object);

   273 static void     gst_nuv_demux_finalize(GObject * object);

   274 static GstStateChangeReturn gst_nuv_demux_change_state(GstElement *

   275                                                        element,

   276                                                        GstStateChange

   277                                                        transition);

   278 static void     gst_nuv_demux_loop(GstPad * pad);

   279 static GstFlowReturn gst_nuv_demux_chain(GstPad * pad, GstBuffer * buf);

   280 static GstFlowReturn gst_nuv_demux_play(GstPad * pad);

   281 static gboolean gst_nuv_demux_sink_activate_pull(GstPad * sinkpad,

   282                                                  gboolean active);

   283 static gboolean gst_nuv_demux_sink_activate_push(GstPad * pad,

   284                                                  gboolean active);

   285 static gboolean gst_nuv_demux_sink_activate(GstPad * sinkpad);

   286 static gboolean gst_nuv_demux_sink_event(GstPad * pad, GstEvent * event);

   287 static gboolean gst_nuv_demux_srcpad_event(GstPad * pad, GstEvent * event);

   288 static frame_index_data *gst_nuv_demux_do_seek_index(GstNuvDemux * nuv,

   289                                                      gint64 seek_pos,

   290                                                      gint64 segment_stop,

   291                                                      GstFormat format);

   292 

   293 

   294 static GstFlowReturn gst_nuv_demux_move_bytes(GstNuvDemux * nuv,

   295                                               guint64 size);

   296 static GstFlowReturn gst_nuv_demux_read_bytes(GstNuvDemux * nuv,

   297                                               guint64 size, gboolean move,

   298                                               GstBuffer ** buffer);

   299 static void     gst_nuv_demux_reset(GstNuvDemux * nuv);

   300 static void     gst_nuv_demux_destoy_src_pad(GstNuvDemux * nuv);

   301 static void     gst_nuv_demux_send_eos(GstNuvDemux * nuv);

   302 static void     gst_nuv_demux_create_seek_index(GstNuvDemux * nuv);

   303 

   304 

   305 #if (GST_VERSION_MINOR == 10) && (GST_VERSION_MICRO < 6)

   306 GstBuffer      *gst_adapter_take_buffer(GstAdapter * adapter,

   307                                         guint nbytes);

   308 #endif

   309 

   310 

   311 GST_BOILERPLATE(GstNuvDemux, gst_nuv_demux, GstElement, GST_TYPE_ELEMENT);

   312 

   313 /******************************************************************************

   314  * Utils function

   315  ******************************************************************************/

   316 #if G_BYTE_ORDER == G_BIG_ENDIAN

   317 static inline   gdouble

   318 _gdouble_swap_le_be(gdouble * d)

   319 {

   320     union {

   321         guint64         i;

   322         gdouble         d;

   323     } u;

   324 

   325     u.d = *d;

   326     u.i = GUINT64_SWAP_LE_BE(u.i);

   327     return u.d;

   328 }

   329 

   330 #define READ_DOUBLE_FROM_LE(d) (_gdouble_swap_le_be((gdouble* ) d))

   331 #else                           /* G_BYTE_ORDER != G_BIG_ENDIAN */

   332 #define READ_DOUBLE_FROM_LE(d) *((gdouble* ) (d))

   333 #endif                          /* G_BYTE_ORDER != G_BIG_ENDIAN */

   334 

   335 static void

   336 double2fraction(double in, int *num, int *denom)

   337 {

   338     if (in == 29.97) {

   339         *num = 30000;

   340         *denom = 1001;

   341     } else if (in == 23.976) {

   342         *num = 24000;

   343         *denom = 1001;

   344     } else {

   345         *denom = 1;

   346         while (in - floor(in) >= 0.1) {

   347             *denom *= 10;

   348             in *= 10.0;

   349         }

   350         *num = (int) floor(in);

   351     }

   352 }

   353 

   354 /*

   355  * GObject Functions 

   356  */

   357 

   358 static void

   359 gst_nuv_demux_base_init(gpointer klass)

   360 {

   361     GstElementClass *element_class = GST_ELEMENT_CLASS(klass);

   362 

   363     gst_element_class_add_pad_template(element_class,

   364                                        gst_static_pad_template_get

   365                                        (&audio_src_template));

   366 

   367     gst_element_class_add_pad_template(element_class,

   368                                        gst_static_pad_template_get

   369                                        (&video_src_template));

   370 

   371     gst_element_class_add_pad_template(element_class,

   372                                        gst_static_pad_template_get

   373                                        (&sink_template));

   374     gst_element_class_set_details(element_class, &gst_nuv_demux_details);

   375 }

   376 

   377 static void

   378 gst_nuv_demux_class_init(GstNuvDemuxClass * klass)

   379 {

   380     GstElementClass *gstelement_class = GST_ELEMENT_CLASS(klass);

   381     GObjectClass   *gobject_class = (GObjectClass *) klass;

   382 

   383     GST_DEBUG_CATEGORY_INIT(nuvdemux_debug, "nuvdemux",

   384                             0, "Demuxer for NUV streams");

   385 

   386     parent_class = g_type_class_peek_parent(klass);

   387 

   388     gobject_class->dispose = gst_nuv_demux_dispose;

   389     gobject_class->finalize = gst_nuv_demux_finalize;

   390     gstelement_class->change_state = gst_nuv_demux_change_state;

   391 

   392     g_type_class_add_private(gobject_class, sizeof(GstNuvDemuxPrivate));

   393 }

   394 

   395 static void

   396 gst_nuv_demux_init(GstNuvDemux * nuv, GstNuvDemuxClass * nuv_class)

   397 {

   398     nuv->priv = GST_NUV_DEMUX_GET_PRIVATE(nuv);

   399     nuv->priv->sinkpad =

   400         gst_pad_new_from_static_template(&sink_template, "sink");

   401 

   402     /*

   403      * creating adapter 

   404      */

   405     nuv->priv->mode = NUV_PUSH_MODE;

   406     nuv->priv->adapter = gst_adapter_new();

   407 

   408     nuv->priv->new_audio_segment = TRUE;

   409     nuv->priv->new_video_segment = TRUE;

   410 

   411     gst_pad_set_activate_function(nuv->priv->sinkpad,

   412                                   gst_nuv_demux_sink_activate);

   413     gst_pad_set_activatepull_function(nuv->priv->sinkpad,

   414                                       gst_nuv_demux_sink_activate_pull);

   415     gst_pad_set_activatepush_function(nuv->priv->sinkpad,

   416                                       gst_nuv_demux_sink_activate_push);

   417     gst_pad_set_chain_function(nuv->priv->sinkpad,

   418                                GST_DEBUG_FUNCPTR(gst_nuv_demux_chain));

   419     gst_pad_set_event_function(nuv->priv->sinkpad,

   420                                GST_DEBUG_FUNCPTR

   421                                (gst_nuv_demux_sink_event));

   422 

   423 

   424     gst_element_add_pad(GST_ELEMENT(nuv), nuv->priv->sinkpad);

   425 

   426 }

   427 

   428 static void

   429 gst_nuv_demux_dispose(GObject * object)

   430 {

   431     GstNuvDemux    *nuv = GST_NUV_DEMUX(object);

   432 

   433 

   434     if (nuv->priv->mpeg_buffer != NULL) {

   435         gst_buffer_unref(nuv->priv->mpeg_buffer);

   436     }

   437 

   438     gst_nuv_demux_reset(GST_NUV_DEMUX(object));

   439     gst_nuv_demux_destoy_src_pad(GST_NUV_DEMUX(object));

   440 

   441     if (nuv->priv->adapter != NULL) {

   442         gst_object_unref(nuv->priv->adapter);

   443     }

   444 }

   445 

   446 static void

   447 gst_nuv_demux_finalize(GObject * object)

   448 {

   449     G_OBJECT_CLASS(parent_class)->finalize(object);

   450 }

   451 

   452 

   453 /*

   454  * HeaderLoad: 

   455  */

   456 static          GstFlowReturn

   457 gst_nuv_demux_header_load(GstNuvDemux * nuv, nuv_header * h)

   458 {

   459     GstBuffer      *buffer = NULL;

   460     GstFlowReturn   res = gst_nuv_demux_read_bytes(nuv, 72, TRUE, &buffer);

   461 

   462     if ((res != GST_FLOW_OK) || (buffer == NULL)) {

   463         goto done;

   464     }

   465 

   466     if (h != NULL) {

   467         memcpy(h->id, buffer->data, 12);

   468         memcpy(h->version, buffer->data + 12, 5);

   469         h->i_width = GST_READ_UINT32_LE(&buffer->data[20]);

   470         h->i_height = GST_READ_UINT32_LE(&buffer->data[24]);

   471         h->i_width_desired = GST_READ_UINT32_LE(&buffer->data[28]);

   472         h->i_height_desired = GST_READ_UINT32_LE(&buffer->data[32]);

   473         h->i_mode = GPOINTER_TO_INT(buffer->data[36]);

   474         h->d_aspect = READ_DOUBLE_FROM_LE(&buffer->data[40]);

   475         h->d_fps = READ_DOUBLE_FROM_LE(&buffer->data[48]);

   476         /*

   477          * get the num and denom values from fps 

   478          */

   479         double2fraction(h->d_fps, &h->i_fpsn, &h->i_fpsd);

   480         h->i_video_blocks = GST_READ_UINT32_LE(&buffer->data[56]);

   481         h->i_audio_blocks = GST_READ_UINT32_LE(&buffer->data[60]);

   482         h->i_text_blocks = GST_READ_UINT32_LE(&buffer->data[64]);

   483         h->i_keyframe_distance = GST_READ_UINT32_LE(&buffer->data[68]);

   484 

   485         GST_DEBUG_OBJECT(nuv,

   486                          "nuv: h=%s v=%s %dx%d a=%f fps=%f v=%d a=%d t=%d kfd=%d",

   487                          h->id, h->version, h->i_width, h->i_height,

   488                          h->d_aspect, h->d_fps, h->i_video_blocks,

   489                          h->i_audio_blocks, h->i_text_blocks,

   490                          h->i_keyframe_distance);

   491     }

   492 

   493   done:

   494     if (buffer != NULL) {

   495         gst_buffer_unref(buffer);

   496         buffer = NULL;

   497     }

   498     return res;

   499 }

   500 

   501 static          GstFlowReturn

   502 gst_nuv_demux_stream_header_data(GstNuvDemux * nuv)

   503 {

   504     GstFlowReturn   res;

   505 

   506     if (nuv->priv->new_file)

   507         res = gst_nuv_demux_header_load(nuv, NULL);

   508     else

   509         res = gst_nuv_demux_header_load(nuv, &nuv->priv->h);

   510 

   511     if (res == GST_FLOW_OK)

   512         nuv->priv->state = GST_NUV_DEMUX_EXTRA_DATA;

   513     return res;

   514 }

   515 

   516 /*

   517  * Read NUV file tag

   518  */

   519 static          GstFlowReturn

   520 gst_nuv_demux_stream_file_header(GstNuvDemux * nuv)

   521 {

   522     GstFlowReturn   res = GST_FLOW_OK;

   523     GstBuffer      *file_header = NULL;

   524 

   525     res = gst_nuv_demux_read_bytes(nuv, 12, FALSE, &file_header);

   526     if (res == GST_FLOW_OK) {

   527         if (strncmp((gchar *) file_header->data, "MythTVVideo", 11) ||

   528             strncmp((gchar *) file_header->data, "NuppelVideo", 11)) {

   529             nuv->priv->state = GST_NUV_DEMUX_HEADER_DATA;

   530         } else {

   531             GST_DEBUG_OBJECT(nuv, "error parsing file header");

   532             nuv->priv->state = GST_NUV_DEMUX_INVALID_DATA;

   533             res = GST_FLOW_ERROR;

   534         }

   535     }

   536 

   537     if (file_header != NULL) {

   538         gst_buffer_unref(file_header);

   539         file_header = NULL;

   540     }

   541     return res;

   542 }

   543 

   544 /*

   545  * FrameHeaderLoad: 

   546  */

   547 static          GstFlowReturn

   548 gst_nuv_demux_frame_header_load(GstNuvDemux * nuv, nuv_frame_header * h)

   549 {

   550     unsigned char  *data;

   551     GstBuffer      *buf = NULL;

   552 

   553     GstFlowReturn   res = gst_nuv_demux_read_bytes(nuv, 12, TRUE, &buf);

   554 

   555     if ((res != GST_FLOW_OK) || (buf == NULL)) {

   556         goto done;

   557     }

   558 

   559     if (h == NULL)

   560         goto done;

   561 

   562     data = buf->data;

   563 

   564     h->i_type = GPOINTER_TO_INT(data[0]);

   565     h->i_compression = GPOINTER_TO_INT(data[1]);

   566     h->i_keyframe = GPOINTER_TO_INT(data[2]);

   567     h->i_filters = GPOINTER_TO_INT(data[3]);

   568     h->i_timecode = GST_READ_UINT32_LE(&data[4]);

   569     h->i_length = GST_READ_UINT32_LE(&data[8]);

   570 

   571     GST_DEBUG_OBJECT(nuv,

   572                      "frame hdr: t=%c c=%c k=%d f=0x%x timecode=%d l=%d",

   573                      h->i_type, h->i_compression ? h->i_compression : ' ',

   574                      h->i_keyframe ? h->i_keyframe : ' ', h->i_filters,

   575                      h->i_timecode, h->i_length);

   576 

   577   done:

   578     if (buf != NULL) {

   579         gst_buffer_unref(buf);

   580         buf = NULL;

   581     }

   582 

   583     return res;

   584 }

   585 

   586 static          GstFlowReturn

   587 gst_nuv_demux_extended_header_load(GstNuvDemux * nuv,

   588                                    nuv_extended_header * h)

   589 {

   590     unsigned char  *data;

   591     GstBuffer      *buff = NULL;

   592 

   593     GstFlowReturn   res = gst_nuv_demux_read_bytes(nuv, 512, TRUE, &buff);

   594 

   595     if ((res != GST_FLOW_OK) || (buff == NULL)) {

   596         goto done;

   597     }

   598 

   599     if (h == NULL)

   600         goto done;

   601 

   602     data = buff->data;

   603     h->i_version = GST_READ_UINT32_LE(&data[0]);

   604     h->i_video_fcc = GST_MAKE_FOURCC(data[4], data[5], data[6], data[7]);

   605     h->i_audio_fcc = GST_MAKE_FOURCC(data[8], data[9], data[10], data[11]);

   606     h->i_audio_sample_rate = GST_READ_UINT32_LE(&data[12]);

   607     h->i_audio_bits_per_sample = GST_READ_UINT32_LE(&data[16]);

   608     h->i_audio_channels = GST_READ_UINT32_LE(&data[20]);

   609     h->i_audio_compression_ratio = GST_READ_UINT32_LE(&data[24]);

   610     h->i_audio_quality = GST_READ_UINT32_LE(&data[28]);

   611     h->i_rtjpeg_quality = GST_READ_UINT32_LE(&data[32]);

   612     h->i_rtjpeg_luma_filter = GST_READ_UINT32_LE(&data[36]);

   613     h->i_rtjpeg_chroma_filter = GST_READ_UINT32_LE(&data[40]);

   614     h->i_lavc_bitrate = GST_READ_UINT32_LE(&data[44]);

   615     h->i_lavc_qmin = GST_READ_UINT32_LE(&data[48]);

   616     h->i_lavc_qmin = GST_READ_UINT32_LE(&data[52]);

   617     h->i_lavc_maxqdiff = GST_READ_UINT32_LE(&data[56]);

   618     h->i_seekable_offset = GST_READ_UINT64_LE(&data[60]);

   619     h->i_keyframe_adjust_offset = GST_READ_UINT64_LE(&data[68]);

   620 

   621     GST_DEBUG_OBJECT(nuv,

   622                      "ex hdr: v=%d vffc=%4.4s afcc=%4.4s %dHz %dbits ach=%d acr=%d aq=%d"

   623                      "rtjpeg q=%d lf=%d lc=%d lavc br=%d qmin=%d qmax=%d maxqdiff=%d seekableoff=%lld keyfao=%lld",

   624                      h->i_version, (gchar *) & h->i_video_fcc,

   625                      (gchar *) & h->i_audio_fcc, h->i_audio_sample_rate,

   626                      h->i_audio_bits_per_sample, h->i_audio_channels,

   627                      h->i_audio_compression_ratio, h->i_audio_quality,

   628                      h->i_rtjpeg_quality, h->i_rtjpeg_luma_filter,

   629                      h->i_rtjpeg_chroma_filter, h->i_lavc_bitrate,

   630                      h->i_lavc_qmin, h->i_lavc_qmax, h->i_lavc_maxqdiff,

   631                      h->i_seekable_offset, h->i_keyframe_adjust_offset);

   632 

   633   done:

   634     if (buff != NULL) {

   635         gst_buffer_unref(buff);

   636         buff = NULL;

   637     }

   638     return res;

   639 }

   640 

   641 

   642 /*

   643  * Query Functions 

   644  */

   645 static const GstQueryType *

   646 gst_nuv_demux_get_src_query_types(GstPad * pad)

   647 {

   648     static const GstQueryType src_types[] = {

   649         GST_QUERY_POSITION,

   650         GST_QUERY_DURATION,

   651         0

   652     };

   653 

   654     return src_types;

   655 }

   656 

   657 static          gboolean

   658 gst_nuv_demux_handle_src_query(GstPad * pad, GstQuery * query)

   659 {

   660     gboolean        res = FALSE;

   661     GstNuvDemux    *nuv = GST_NUV_DEMUX(gst_pad_get_parent(pad));

   662 

   663 

   664     switch (GST_QUERY_TYPE(query)) {

   665     case GST_QUERY_POSITION:

   666         {

   667             GstFormat       format;

   668             gst_query_parse_position(query, &format, NULL);

   669             switch (format) {

   670             case GST_FORMAT_TIME:

   671                 if (GST_CLOCK_TIME_IS_VALID(nuv->priv->last_frame_time)) {

   672                     gst_query_set_position(query, GST_FORMAT_TIME,

   673                                            nuv->priv->last_frame_time);

   674                     res = TRUE;

   675                 }

   676                 break;

   677             default:

   678                 break;

   679             }

   680             break;

   681         }

   682     case GST_QUERY_DURATION:

   683         {

   684             GstFormat       format;

   685             gst_query_parse_duration(query, &format, NULL);

   686             switch (format) {

   687             case GST_FORMAT_TIME:

   688                 if (nuv->priv->duration_time != GST_CLOCK_TIME_NONE) {

   689                     gst_query_set_duration(query, GST_FORMAT_TIME,

   690                                            nuv->priv->duration_time);

   691                     res = TRUE;

   692                 }

   693                 break;

   694             default:

   695                 break;

   696             }

   697             break;

   698         }

   699     default:

   700         break;

   701     }

   702 

   703     if (res == FALSE) {

   704         res = gst_pad_query_default(pad, query);

   705     }

   706 

   707     gst_object_unref(nuv);

   708     return res;

   709 }

   710 

   711 static GstPad  *

   712 gst_nuv_demux_create_pad(GstNuvDemux * nuv, GstCaps * caps,

   713                          GstStaticPadTemplate * template,

   714                          const gchar * name)

   715 {

   716     GstPad         *pad = NULL;

   717     pad = gst_pad_new_from_static_template(template, name);

   718     gst_pad_set_caps(pad, caps);

   719     gst_pad_set_active(pad, TRUE);

   720     gst_pad_use_fixed_caps(pad);

   721     gst_element_add_pad(GST_ELEMENT(nuv), pad);

   722 

   723     gst_pad_set_event_function(pad,

   724                                GST_DEBUG_FUNCPTR

   725                                (gst_nuv_demux_srcpad_event));

   726 

   727     gst_pad_set_query_type_function(pad,

   728                                     GST_DEBUG_FUNCPTR

   729                                     (gst_nuv_demux_get_src_query_types));

   730 

   731     gst_pad_set_query_function(pad,

   732                                GST_DEBUG_FUNCPTR

   733                                (gst_nuv_demux_handle_src_query));

   734 

   735 

   736     return pad;

   737 }

   738 

   739 static void

   740 gst_nuv_demux_create_pads(GstNuvDemux * nuv)

   741 {

   742     if (nuv->priv->h.i_video_blocks != 0) {

   743         GstCaps        *video_caps = NULL;

   744 

   745         video_caps = gst_caps_new_simple("video/x-divx",

   746                                          "divxversion", G_TYPE_INT, 4,

   747                                          "width", G_TYPE_INT,

   748                                          nuv->priv->h.i_width, "height",

   749                                          G_TYPE_INT, nuv->priv->h.i_height,

   750                                          "framerate", GST_TYPE_FRACTION,

   751                                          nuv->priv->h.i_fpsn,

   752                                          nuv->priv->h.i_fpsd, "format",

   753                                          GST_TYPE_FOURCC,

   754                                          nuv->priv->eh.i_video_fcc,

   755                                          "pixel-aspect-ratio",

   756                                          GST_TYPE_FRACTION,

   757                                          (gint) (nuv->priv->h.d_aspect *

   758                                                  1000.0f), 1000, NULL);

   759 

   760         nuv->priv->src_video_pad =

   761             gst_nuv_demux_create_pad(nuv, video_caps, &video_src_template,

   762                                      "video_src");

   763         gst_caps_unref(video_caps);

   764     }

   765 

   766     if (nuv->priv->h.i_audio_blocks != 0) {

   767         GstCaps        *audio_caps = NULL;

   768 

   769         audio_caps = gst_caps_new_simple("audio/mpeg", "rate", G_TYPE_INT, nuv->priv->eh.i_audio_sample_rate, "format", GST_TYPE_FOURCC, nuv->priv->eh.i_audio_fcc, "channels", G_TYPE_INT, nuv->priv->eh.i_audio_channels, "layer", G_TYPE_INT, 3, // fixme: 

   770                                                                                                                                                                                                                                                     // magic 

   771                                                                                                                                                                                                                                                     // number

   772                                          "mpegversion", G_TYPE_INT,

   773                                          nuv->priv->eh.i_version, NULL);

   774 

   775         nuv->priv->src_audio_pad =

   776             gst_nuv_demux_create_pad(nuv, audio_caps, &audio_src_template,

   777                                      "audio_src");

   778         gst_caps_unref(audio_caps);

   779     }

   780 

   781     gst_element_no_more_pads(GST_ELEMENT(nuv));

   782 }

   783 

   784 static          gboolean

   785 gst_nuv_demux_validate_header(nuv_frame_header * h)

   786 {

   787     gboolean        valid = FALSE;

   788     // g_usleep (1 * G_USEC_PER_SEC );

   789     switch (h->i_type) {

   790         /*

   791          * case 'V': if (h->i_compression == 0 || h->i_compression == 1 ||

   792          * h->i_compression == 2 || h->i_compression == 'N' ||

   793          * h->i_compression == 'L') { valid = TRUE; } break; case 'A': if

   794          * (h->i_compression == 0 || h->i_compression == 1 ||

   795          * h->i_compression == 2 || h->i_compression == 3 ||

   796          * h->i_compression == 'F' || h->i_compression == 'S' ||

   797          * h->i_compression == 'N' || h->i_compression == 'L') { valid =

   798          * TRUE; } break; case 'S': if (h->i_compression == 'B' ||

   799          * h->i_compression == 'A' || h->i_compression == 'V' ||

   800          * h->i_compression == 'S') { valid = TRUE; } break; 

   801          */

   802     case 'A':

   803     case 'V':

   804     case 'S':

   805     case 'R':

   806     case 'D':

   807     case 'Q':

   808         valid = TRUE;

   809         break;

   810     default:

   811         valid = FALSE;

   812     }

   813 

   814     return valid;

   815 }

   816 

   817 static          GstFlowReturn

   818 gst_nuv_demux_read_head_frame(GstNuvDemux * nuv)

   819 {

   820     GstFlowReturn   ret = GST_FLOW_OK;

   821     gboolean        valid = FALSE;

   822 

   823     do {

   824         ret = gst_nuv_demux_frame_header_load(nuv, &nuv->priv->fh);

   825         if (ret != GST_FLOW_OK) {

   826             return ret;

   827         }

   828 

   829         if (gst_nuv_demux_validate_header(&nuv->priv->fh) == TRUE)

   830             valid = TRUE;

   831 

   832     }

   833     while (valid == FALSE);

   834 

   835     nuv->priv->state = GST_NUV_DEMUX_MOVI;

   836     return ret;

   837 }

   838 

   839 static          gboolean

   840 gst_nuv_combine_flow(GstNuvDemux * nuv)

   841 {

   842     GstFlowReturn   ret_video = nuv->priv->last_video_return;

   843     GstFlowReturn   ret_audio = nuv->priv->last_audio_return;

   844 

   845     if ((ret_video != GST_FLOW_OK) && (ret_audio != GST_FLOW_OK))

   846         return FALSE;

   847 

   848     if (GST_FLOW_IS_FATAL(ret_video))

   849         return FALSE;

   850 

   851     if (GST_FLOW_IS_FATAL(ret_audio))

   852         return FALSE;

   853 

   854     return TRUE;

   855 }

   856 

   857 static          GstFlowReturn

   858 gst_nuv_demux_stream_data(GstNuvDemux * nuv)

   859 {

   860     GstFlowReturn   ret = GST_FLOW_OK;

   861     GstPad         *pad = NULL;

   862     guint64         timestamp;

   863     GstBuffer      *buf = NULL;

   864     nuv_frame_header h;

   865 

   866     h = nuv->priv->fh;

   867 

   868     if (h.i_type == 'R') {

   869         goto done;

   870     }

   871 

   872     if (h.i_length > 0) {

   873         ret = gst_nuv_demux_read_bytes(nuv, h.i_length, TRUE, &buf);

   874         if ((ret != GST_FLOW_OK) || (buf == NULL)) {

   875             goto done;

   876         }

   877 

   878         if ((h.i_timecode < 0)) {

   879             h.i_timecode = 0;

   880             // goto done;

   881         }

   882 

   883         timestamp = h.i_timecode * GST_MSECOND;

   884         GST_BUFFER_TIMESTAMP(buf) = timestamp;

   885     } else {

   886         goto done;

   887     }

   888 

   889 

   890     switch (h.i_type) {

   891     case 'V':

   892         {

   893             pad = nuv->priv->src_video_pad;

   894 

   895             if (nuv->priv->new_video_segment) {

   896 

   897                 /*

   898                  * send new segment event 

   899                  */

   900                 gst_pad_push_event(nuv->priv->src_video_pad,

   901                                    gst_event_new_new_segment(TRUE, 1.0,

   902                                                              GST_FORMAT_TIME,

   903                                                              0,

   904                                                              GST_CLOCK_TIME_NONE,

   905                                                              0));

   906 

   907                 if (nuv->priv->time_start == GST_CLOCK_TIME_NONE) {

   908                     nuv->priv->time_start = timestamp;

   909                 }

   910                 nuv->priv->new_video_segment = FALSE;

   911             }

   912 

   913             break;

   914         }

   915     case 'A':

   916         {

   917             pad = nuv->priv->src_audio_pad;

   918 

   919             if (nuv->priv->new_audio_segment) {

   920                 /*

   921                  * send new segment event 

   922                  */

   923                 gst_pad_push_event(nuv->priv->src_audio_pad,

   924                                    gst_event_new_new_segment(TRUE, 1.0,

   925                                                              GST_FORMAT_TIME,

   926                                                              0,

   927                                                              GST_CLOCK_TIME_NONE,

   928                                                              0));

   929 

   930                 if (nuv->priv->time_start == GST_CLOCK_TIME_NONE) {

   931                     nuv->priv->time_start = timestamp;

   932                 }

   933                 nuv->priv->new_audio_segment = FALSE;

   934             }

   935 

   936             break;

   937         }

   938     case 'S':

   939         {

   940             switch (h.i_compression) {

   941             case 'V':

   942                 GST_DEBUG_OBJECT(nuv, "sending new video segment: %d",

   943                                  h.i_timecode);

   944                 gst_pad_push_event(nuv->priv->src_video_pad,

   945                                    gst_event_new_new_segment(TRUE, 1.0,

   946                                                              GST_FORMAT_TIME,

   947                                                              h.i_timecode *

   948                                                              GST_MSECOND,

   949                                                              GST_CLOCK_TIME_NONE,

   950                                                              0));

   951                 break;

   952             case 'A':

   953                 GST_DEBUG_OBJECT(nuv, "sending new audio segment: %d",

   954                                  h.i_timecode);

   955                 gst_pad_push_event(nuv->priv->src_audio_pad,

   956                                    gst_event_new_new_segment(TRUE, 1.0,

   957                                                              GST_FORMAT_TIME,

   958                                                              0,

   959                                                              GST_CLOCK_TIME_NONE,

   960                                                              0));

   961                 break;

   962             default:

   963                 break;

   964             }

   965             goto done;

   966         }

   967     default:

   968         break;

   969     }

   970 

   971     if ((buf != NULL) && (pad != NULL)) {

   972         /*

   973          * pushing the buffer 

   974          */

   975         gst_buffer_set_caps(buf, GST_PAD_CAPS(pad));

   976         ret = gst_pad_push(pad, buf);

   977         buf = NULL;

   978 

   979         if (ret != GST_FLOW_OK) {

   980             GST_WARNING_OBJECT(nuv, "error: %d pushing on srcpad %s", ret,

   981                                gst_pad_get_name(pad));

   982 

   983             if (pad == nuv->priv->src_video_pad) {

   984                 nuv->priv->last_video_return = ret;

   985             } else if (pad == nuv->priv->src_audio_pad) {

   986                 nuv->priv->last_audio_return = ret;

   987             }

   988 

   989             /*

   990              * verify anothers flow if is necessary stop task 

   991              */

   992             if (gst_nuv_combine_flow(nuv) != FALSE) {

   993                 ret = GST_FLOW_OK;

   994             } else {

   995                 GST_WARNING_OBJECT(nuv, "error: on push");

   996             }

   997 

   998         }

   999     }

  1000 

  1001   done:

  1002     if (buf != NULL) {

  1003         gst_buffer_unref(buf);

  1004         buf = NULL;

  1005     }

  1006     if (ret == GST_FLOW_OK) {

  1007         nuv->priv->state = GST_NUV_DEMUX_FRAME_HEADER;

  1008         memset(&nuv->priv->fh, 0, sizeof(nuv->priv->fh));

  1009     }

  1010     return ret;

  1011 }

  1012 

  1013 static          GstFlowReturn

  1014 gst_nuv_demux_stream_mpeg_data(GstNuvDemux * nuv)

  1015 {

  1016     GstFlowReturn   ret = GST_FLOW_OK;

  1017 

  1018     /*

  1019      * ffmpeg extra data 

  1020      */

  1021     if (nuv->priv->new_file) {

  1022         GstBuffer      *buf;

  1023         ret =

  1024             gst_nuv_demux_read_bytes(nuv, nuv->priv->mpeg_data_size, TRUE,

  1025                                      &buf);

  1026         gst_buffer_unref(buf);

  1027     } else {

  1028         ret =

  1029             gst_nuv_demux_read_bytes(nuv, nuv->priv->mpeg_data_size, TRUE,

  1030                                      &nuv->priv->mpeg_buffer);

  1031     }

  1032 

  1033     if ((ret != GST_FLOW_OK) || (nuv->priv->mpeg_buffer == NULL)) {

  1034         return ret;

  1035     }

  1036 

  1037     GST_BUFFER_SIZE(nuv->priv->mpeg_buffer) = nuv->priv->mpeg_data_size;

  1038     nuv->priv->state = GST_NUV_DEMUX_EXTEND_HEADER;

  1039     return ret;

  1040 }

  1041 

  1042 static          GstFlowReturn

  1043 gst_nuv_demux_stream_extra_data(GstNuvDemux * nuv)

  1044 {

  1045     GstFlowReturn   ret = GST_FLOW_OK;

  1046 

  1047     /*

  1048      * Load 'D' 

  1049      */

  1050     nuv_frame_header h;

  1051 

  1052     if (nuv->priv->new_file)

  1053         ret = gst_nuv_demux_frame_header_load(nuv, NULL);

  1054     else

  1055         ret = gst_nuv_demux_frame_header_load(nuv, &h);

  1056 

  1057     if (ret != GST_FLOW_OK)

  1058         return ret;

  1059 

  1060     if (h.i_type != 'D') {

  1061         GST_WARNING_OBJECT(nuv, "Unsuported rtjpeg");

  1062         return GST_FLOW_NOT_SUPPORTED;

  1063     }

  1064 

  1065     if (h.i_length > 0) {

  1066         if (h.i_compression == 'F') {

  1067             nuv->priv->state = GST_NUV_DEMUX_MPEG_DATA;

  1068         } else {

  1069             GST_WARNING_OBJECT(nuv,

  1070                                "only file with extended chunk are supported");

  1071             return GST_FLOW_NOT_SUPPORTED;

  1072         }

  1073     } else {

  1074         nuv->priv->state = GST_NUV_DEMUX_EXTEND_HEADER;

  1075     }

  1076 

  1077     return ret;

  1078 }

  1079 

  1080 static          GstFlowReturn

  1081 gst_nuv_demux_stream_extend_header_data(GstNuvDemux * nuv)

  1082 {

  1083     GstFlowReturn   ret = GST_FLOW_OK;

  1084 

  1085     if (nuv->priv->new_file)

  1086         ret = gst_nuv_demux_extended_header_load(nuv, NULL);

  1087     else {

  1088         ret = gst_nuv_demux_extended_header_load(nuv, &nuv->priv->eh);

  1089         if (ret != GST_FLOW_OK)

  1090             return ret;

  1091         gst_nuv_demux_create_pads(nuv);

  1092     }

  1093 

  1094     nuv->priv->state = GST_NUV_DEMUX_INDEX_CREATE;

  1095     return ret;

  1096 }

  1097 

  1098 static          GstFlowReturn

  1099 gst_nuv_demux_stream_extend_header(GstNuvDemux * nuv)

  1100 {

  1101     GstBuffer      *buf = NULL;

  1102     GstFlowReturn   res = GST_FLOW_OK;

  1103 

  1104     res = gst_nuv_demux_read_bytes(nuv, 1, FALSE, &buf);

  1105     if ((res != GST_FLOW_OK) || (buf == NULL)) {

  1106         if (buf != NULL) {

  1107             gst_buffer_unref(buf);

  1108         }

  1109         return res;

  1110     }

  1111 

  1112     if (buf->data[0] == 'X') {

  1113         gst_buffer_unref(buf);

  1114         buf = NULL;

  1115         nuv_frame_header h;

  1116 

  1117         res = gst_nuv_demux_frame_header_load(nuv, &h);

  1118         if (res != GST_FLOW_OK)

  1119             return res;

  1120 

  1121         if (h.i_length != 512) {

  1122             return GST_FLOW_ERROR;

  1123         }

  1124         nuv->priv->state = GST_NUV_DEMUX_EXTEND_HEADER_DATA;

  1125     } else {

  1126         nuv->priv->state = GST_NUV_DEMUX_INVALID_DATA;

  1127         g_object_unref(buf);

  1128         GST_ELEMENT_WARNING(nuv, STREAM, FAILED,

  1129                             (_("incomplete NUV support")),

  1130                             ("incomplete NUV support"));

  1131         return GST_FLOW_ERROR;

  1132     }

  1133     return res;

  1134 }

  1135 

  1136 static void

  1137 gst_nuv_demux_create_seek_index(GstNuvDemux * nuv)

  1138 {

  1139     GstMessage     *msg;

  1140     nuv_frame_header h;

  1141 

  1142     while (gst_nuv_demux_frame_header_load(nuv, &h) == GST_FLOW_OK) {

  1143         if ((h.i_type == 'V') && (h.i_keyframe == 0)) {

  1144             frame_index_data *f = g_new0(frame_index_data, 1);

  1145 

  1146             f->offset = nuv->priv->offset - 12;

  1147             f->timecode = h.i_timecode * GST_MSECOND;

  1148 

  1149             nuv->priv->index = g_slist_append(nuv->priv->index, f);

  1150         }

  1151         if (h.i_type != 'R') {

  1152             nuv->priv->offset += h.i_length;

  1153             if (h.i_type == 'A' || h.i_type == 'V')

  1154                 nuv->priv->duration_time = h.i_timecode * GST_MSECOND;

  1155         }

  1156     }

  1157     GST_DEBUG_OBJECT(nuv,

  1158                      "CREATING INDEX: DONE : DURATION Bytes/Sec: %"

  1159                      G_GUINT64_FORMAT "/%" G_GUINT64_FORMAT,

  1160                      nuv->priv->offset, nuv->priv->duration_time);

  1161 

  1162     nuv->priv->duration_bytes = nuv->priv->offset;

  1163     nuv->priv->offset = nuv->priv->header_lengh;

  1164 

  1165     msg =

  1166         gst_message_new_duration(GST_OBJECT(nuv), GST_FORMAT_TIME,

  1167                                  nuv->priv->duration_time);

  1168     gst_element_post_message(GST_ELEMENT(nuv), msg);

  1169 }

  1170 

  1171 static          GstFlowReturn

  1172 gst_nuv_demux_play(GstPad * pad)

  1173 {

  1174     GstFlowReturn   res = GST_FLOW_OK;

  1175     GstNuvDemux    *nuv = GST_NUV_DEMUX(GST_PAD_PARENT(pad));

  1176 

  1177     switch (nuv->priv->state) {

  1178     case GST_NUV_DEMUX_START:

  1179         res = gst_nuv_demux_stream_file_header(nuv);

  1180         if ((res != GST_FLOW_OK) && (res != GST_FLOW_ERROR_NO_DATA)) {

  1181             goto pause;

  1182         }

  1183         break;

  1184 

  1185     case GST_NUV_DEMUX_HEADER_DATA:

  1186         res = gst_nuv_demux_stream_header_data(nuv);

  1187         if ((res != GST_FLOW_OK) && (res != GST_FLOW_ERROR_NO_DATA)) {

  1188             goto pause;

  1189         }

  1190         break;

  1191 

  1192     case GST_NUV_DEMUX_EXTRA_DATA:

  1193         res = gst_nuv_demux_stream_extra_data(nuv);

  1194         if ((res != GST_FLOW_OK) && (res != GST_FLOW_ERROR_NO_DATA)) {

  1195             goto pause;

  1196         }

  1197         break;

  1198 

  1199     case GST_NUV_DEMUX_MPEG_DATA:

  1200         res = gst_nuv_demux_stream_mpeg_data(nuv);

  1201         if ((res != GST_FLOW_OK) && (res != GST_FLOW_ERROR_NO_DATA)) {

  1202             goto pause;

  1203         }

  1204         break;

  1205 

  1206     case GST_NUV_DEMUX_EXTEND_HEADER:

  1207         res = gst_nuv_demux_stream_extend_header(nuv);

  1208         if ((res != GST_FLOW_OK) && (res != GST_FLOW_ERROR_NO_DATA)) {

  1209             goto pause;

  1210         }

  1211         break;

  1212 

  1213     case GST_NUV_DEMUX_EXTEND_HEADER_DATA:

  1214         res = gst_nuv_demux_stream_extend_header_data(nuv);

  1215         if ((res != GST_FLOW_OK) && (res != GST_FLOW_ERROR_NO_DATA)) {

  1216             goto pause;

  1217         }

  1218         // store file header size

  1219         nuv->priv->header_lengh = nuv->priv->offset;

  1220         break;

  1221 

  1222     case GST_NUV_DEMUX_INDEX_CREATE:

  1223         if ((nuv->priv->mode == NUV_PULL_MODE) && (!nuv->priv->new_file)) {

  1224             gst_nuv_demux_create_seek_index(nuv);

  1225         }

  1226 

  1227     case GST_NUV_DEMUX_FRAME_HEADER:

  1228         res = gst_nuv_demux_read_head_frame(nuv);

  1229         if ((res != GST_FLOW_OK) && (res != GST_FLOW_ERROR_NO_DATA)) {

  1230             goto pause;

  1231         }

  1232         break;

  1233 

  1234     case GST_NUV_DEMUX_MOVI:

  1235         res = gst_nuv_demux_stream_data(nuv);

  1236         if ((res != GST_FLOW_OK) && (res != GST_FLOW_ERROR_NO_DATA)) {

  1237             goto pause;

  1238         }

  1239         break;

  1240 

  1241     case GST_NUV_DEMUX_INVALID_DATA:

  1242         goto pause;

  1243         break;

  1244     default:

  1245         g_assert_not_reached();

  1246     }

  1247 

  1248     return GST_FLOW_OK;

  1249 

  1250   pause:

  1251     GST_LOG_OBJECT(nuv, "pausing task, reason %s", gst_flow_get_name(res));

  1252     gst_pad_pause_task(nuv->priv->sinkpad);

  1253 

  1254     if (res == GST_FLOW_ERROR_EOS) {

  1255         gst_nuv_demux_send_eos(nuv);

  1256         nuv->priv->eos = TRUE;

  1257         res = GST_FLOW_OK;

  1258     }

  1259 

  1260     if (GST_FLOW_IS_FATAL(res)) {

  1261         GST_ELEMENT_ERROR(nuv, STREAM, FAILED,

  1262                           (_("Internal data stream error.")),

  1263                           ("streaming stopped, reason %s",

  1264                            gst_flow_get_name(res)));

  1265 

  1266         gst_nuv_demux_send_eos(nuv);

  1267     }

  1268     return res;

  1269 }

  1270 

  1271 static void

  1272 gst_nuv_demux_send_eos(GstNuvDemux * nuv)

  1273 {

  1274     gst_element_post_message(GST_ELEMENT(nuv),

  1275                              gst_message_new_segment_done(GST_OBJECT(nuv),

  1276                                                           GST_FORMAT_TIME,

  1277                                                           -1));

  1278 

  1279     if (nuv->priv->src_video_pad)

  1280         gst_pad_push_event(nuv->priv->src_video_pad, gst_event_new_eos());

  1281     if (nuv->priv->src_audio_pad)

  1282         gst_pad_push_event(nuv->priv->src_audio_pad, gst_event_new_eos());

  1283 }

  1284 

  1285 static          GstFlowReturn

  1286 gst_nuv_demux_read_bytes(GstNuvDemux * nuv, guint64 size, gboolean move,

  1287                          GstBuffer ** buffer)

  1288 {

  1289     GstFlowReturn   ret = GST_FLOW_OK;

  1290 

  1291     if (size == 0) {

  1292         return ret;

  1293     }

  1294 

  1295     if (nuv->priv->mode == NUV_PULL_MODE) {

  1296         ret =

  1297             gst_pad_pull_range(nuv->priv->sinkpad, nuv->priv->offset, size,

  1298                                buffer);

  1299         if (ret == GST_FLOW_OK) {

  1300             if (move) {

  1301                 nuv->priv->offset += size;

  1302             }

  1303             /*

  1304              * got eos 

  1305              */

  1306         } else if (ret == GST_FLOW_UNEXPECTED) {

  1307             return GST_FLOW_ERROR_EOS;

  1308         }

  1309     } else {

  1310         if (gst_adapter_available(nuv->priv->adapter) < size) {

  1311             nuv->priv->more_data = TRUE;

  1312             return GST_FLOW_ERROR_NO_DATA;

  1313         }

  1314         if (move) {

  1315             *buffer = gst_adapter_take_buffer(nuv->priv->adapter, size);

  1316         } else {

  1317             guint8         *data = NULL;

  1318             data = (guint8 *) gst_adapter_peek(nuv->priv->adapter, size);

  1319             *buffer = gst_buffer_new();

  1320             gst_buffer_set_data(*buffer, data, size);

  1321         }

  1322     }

  1323     return ret;

  1324 }

  1325 

  1326 static          GstFlowReturn

  1327 gst_nuv_demux_move_bytes(GstNuvDemux * nuv, guint64 size)

  1328 {

  1329     GstFlowReturn   ret = GST_FLOW_OK;

  1330 

  1331     if (size == 0) {

  1332         return ret;

  1333     }

  1334 

  1335     if (nuv->priv->mode == NUV_PULL_MODE) {

  1336         nuv->priv->offset += size;

  1337     } else {

  1338         if (gst_adapter_available(nuv->priv->adapter) < size) {

  1339             nuv->priv->more_data = TRUE;

  1340             return GST_FLOW_ERROR_NO_DATA;

  1341         }

  1342         gst_adapter_flush(nuv->priv->adapter, size);

  1343     }

  1344     return ret;

  1345 }

  1346 

  1347 static          gboolean

  1348 gst_nuv_demux_sink_activate(GstPad * sinkpad)

  1349 {

  1350     gboolean        res = TRUE;

  1351     GstNuvDemux    *nuv = GST_NUV_DEMUX(gst_pad_get_parent(sinkpad));

  1352 

  1353     if (gst_pad_check_pull_range(sinkpad)) {

  1354         gst_adapter_clear(nuv->priv->adapter);

  1355         res = gst_pad_activate_pull(sinkpad, TRUE);

  1356     } else {

  1357         gst_adapter_clear(nuv->priv->adapter);

  1358         res = gst_pad_activate_push(sinkpad, TRUE);

  1359     }

  1360 

  1361     g_object_unref(nuv);

  1362     return res;

  1363 }

  1364 

  1365 static          gboolean

  1366 gst_nuv_demux_sink_activate_pull(GstPad * sinkpad, gboolean active)

  1367 {

  1368     GstNuvDemux    *nuv = GST_NUV_DEMUX(gst_pad_get_parent(sinkpad));

  1369 

  1370     if (active) {

  1371         GST_DEBUG_OBJECT(nuv, "activating pull function");

  1372         nuv->priv->mode = NUV_PULL_MODE;

  1373         gst_adapter_clear(nuv->priv->adapter);

  1374 

  1375         gst_pad_start_task(sinkpad, (GstTaskFunction) gst_nuv_demux_loop,

  1376                            sinkpad);

  1377     } else {

  1378         GST_DEBUG_OBJECT(nuv, "deactivating pull function");

  1379         gst_pad_stop_task(sinkpad);

  1380     }

  1381     gst_object_unref(nuv);

  1382 

  1383     return TRUE;

  1384 }

  1385 

  1386 static          gboolean

  1387 gst_nuv_demux_sink_activate_push(GstPad * pad, gboolean active)

  1388 {

  1389     GstNuvDemux    *nuv = GST_NUV_DEMUX(gst_pad_get_parent(pad));

  1390 

  1391     if (active) {

  1392         nuv->priv->mode = NUV_PUSH_MODE;

  1393         gst_adapter_clear(nuv->priv->adapter);

  1394 

  1395         GST_DEBUG_OBJECT(nuv, "activating push/chain function");

  1396     } else {

  1397         GST_DEBUG_OBJECT(nuv, "deactivating push/chain function");

  1398     }

  1399 

  1400     gst_object_unref(nuv);

  1401 

  1402     return TRUE;

  1403 }

  1404 

  1405 static frame_index_data *

  1406 gst_nuv_demux_do_seek_index(GstNuvDemux * nuv, gint64 seek_pos,

  1407                             gint64 segment_stop, GstFormat format)

  1408 {

  1409     GSList         *l;

  1410     frame_index_data *ret = NULL;

  1411 

  1412     if (nuv->priv->index == NULL) {

  1413         return NULL;

  1414     }

  1415 

  1416     /*

  1417      * find keyframe closest to the requested position 

  1418      */

  1419     for (l = nuv->priv->index; l != NULL; l = l->next) {

  1420         frame_index_data *f = (frame_index_data *) l->data;

  1421         gint64          pos = 0;

  1422 

  1423         if (format == GST_FORMAT_BYTES) {

  1424             pos = f->offset;

  1425         } else if (format == GST_FORMAT_TIME) {

  1426             pos = f->timecode;

  1427         } else {

  1428             return NULL;

  1429         }

  1430 

  1431         if (pos >= seek_pos) {

  1432             ret = f;

  1433             break;

  1434         }

  1435 

  1436         if ((segment_stop != -1) && (segment_stop != GST_CLOCK_TIME_NONE)

  1437             && (pos > segment_stop)) {

  1438             break;

  1439         }

  1440     }

  1441 

  1442     return ret;

  1443 }

  1444 

  1445 static          gboolean

  1446 gst_nuv_demux_do_seek(GstNuvDemux * nuv, GstEvent * event)

  1447 {

  1448     gdouble         rate;

  1449     GstFormat       format;

  1450     GstSeekFlags    flags;

  1451     GstSeekType     cur_type;

  1452     gint64          cur;

  1453     GstSeekType     stop_type;

  1454     gint64          stop;

  1455     gboolean        flush;

  1456     frame_index_data *entry;

  1457     gint64          segment_start;

  1458     gint64          segment_stop;

  1459     GstEvent       *newsegment_event;

  1460 

  1461     if (nuv->priv->eos) {

  1462         return FALSE;

  1463     }

  1464 

  1465     if (nuv->priv->mode == NUV_PUSH_MODE) {

  1466         return FALSE;

  1467     }

  1468 

  1469 

  1470     gst_event_parse_seek(event, &rate, &format, &flags,

  1471                          &cur_type, &cur, &stop_type, &stop);

  1472 

  1473 

  1474 

  1475     /*

  1476      * if (format == GST_FORMAT_TIME) { GST_DEBUG_OBJECT (nuv, "Can only

  1477      * seek on BYTES"); return FALSE; } 

  1478      */

  1479 

  1480     if (rate <= 0.0) {

  1481         GST_DEBUG_OBJECT(nuv, "Can only seek with positive rate");

  1482         return FALSE;

  1483     }

  1484 

  1485     if (cur_type == GST_SEEK_TYPE_SET) {

  1486         GST_OBJECT_LOCK(nuv);

  1487         if (gst_nuv_demux_do_seek_index(nuv, cur, -1, format) == NULL) {

  1488             GST_DEBUG_OBJECT(nuv, "No matching seek entry in index");

  1489             GST_OBJECT_UNLOCK(nuv);

  1490             return FALSE;

  1491         }

  1492         GST_OBJECT_UNLOCK(nuv);

  1493     }

  1494 

  1495     flush = !!(flags & GST_SEEK_FLAG_FLUSH);

  1496 

  1497     if (flush) {

  1498         gst_pad_push_event(nuv->priv->sinkpad,

  1499                            gst_event_new_flush_start());

  1500         if (nuv->priv->src_video_pad != NULL) {

  1501             gst_pad_push_event(nuv->priv->src_video_pad,

  1502                                gst_event_new_flush_start());

  1503         }

  1504 

  1505         if (nuv->priv->src_audio_pad != NULL) {

  1506             gst_pad_push_event(nuv->priv->src_audio_pad,

  1507                                gst_event_new_flush_start());

  1508         }

  1509     } else {

  1510         gst_pad_pause_task(nuv->priv->sinkpad);

  1511     }

  1512 

  1513     GST_PAD_STREAM_LOCK(nuv->priv->sinkpad);

  1514     GST_OBJECT_LOCK(nuv);

  1515 

  1516 

  1517     if (cur == GST_CLOCK_TIME_NONE)

  1518         cur = 0;

  1519     if (stop == GST_CLOCK_TIME_NONE)

  1520         stop = nuv->priv->duration_time;

  1521 

  1522     if (cur_type == GST_SEEK_TYPE_SET)

  1523         segment_start = cur;

  1524     else if (cur_type == GST_SEEK_TYPE_CUR)

  1525         segment_start = nuv->priv->segment_start + cur;

  1526     else

  1527         segment_start = nuv->priv->segment_start;

  1528 

  1529     if (stop_type == GST_SEEK_TYPE_SET)

  1530         segment_stop = stop;

  1531     else if (stop_type == GST_SEEK_TYPE_CUR)

  1532         segment_stop = nuv->priv->segment_stop + stop;

  1533     else

  1534         segment_stop = nuv->priv->segment_stop;

  1535 

  1536     segment_start = CLAMP(segment_start, 0, nuv->priv->duration_time);

  1537     segment_stop = CLAMP(segment_stop, 0, nuv->priv->duration_time);

  1538 

  1539     entry = gst_nuv_demux_do_seek_index(nuv, segment_start,

  1540                                         segment_stop, format);

  1541 

  1542     if (entry == NULL) {

  1543         GST_DEBUG_OBJECT(nuv, "No matching seek entry in index");

  1544         goto seek_error;

  1545     }

  1546 

  1547     segment_start = entry->timecode;

  1548 

  1549     nuv->priv->segment_start = segment_start;

  1550     nuv->priv->segment_stop = segment_stop;

  1551 

  1552     GST_OBJECT_UNLOCK(nuv);

  1553 

  1554     if (!nuv->priv->eos) {

  1555         GstMessage     *msg;

  1556         msg =

  1557             gst_message_new_segment_start(GST_OBJECT(nuv), GST_FORMAT_TIME,

  1558                                           nuv->priv->segment_start);

  1559 

  1560         gst_element_post_message(GST_ELEMENT(nuv), msg);

  1561     }

  1562 

  1563     GST_DEBUG_OBJECT(nuv,

  1564                      "NEW SEGMENT START %" G_GUINT64_FORMAT ", STOP %"

  1565                      G_GUINT64_FORMAT, segment_start, segment_stop);

  1566     newsegment_event =

  1567         gst_event_new_new_segment(FALSE, rate, GST_FORMAT_TIME,

  1568                                   segment_start, segment_stop,

  1569                                   segment_start);

  1570 

  1571 

  1572     if (flush) {

  1573         if (nuv->priv->src_video_pad != NULL) {

  1574             gst_pad_push_event(nuv->priv->src_video_pad,

  1575                                gst_event_new_flush_stop());

  1576         }

  1577 

  1578         if (nuv->priv->src_audio_pad != NULL) {

  1579             gst_pad_push_event(nuv->priv->src_audio_pad,

  1580                                gst_event_new_flush_stop());

  1581         }

  1582 

  1583         gst_pad_push_event(nuv->priv->sinkpad, gst_event_new_flush_stop());

  1584     }

  1585 

  1586 

  1587     if (nuv->priv->src_video_pad != NULL) {

  1588         gst_pad_push_event(nuv->priv->src_video_pad,

  1589                            gst_event_ref(newsegment_event));

  1590     }

  1591     if (nuv->priv->src_audio_pad != NULL) {

  1592         gst_pad_push_event(nuv->priv->src_audio_pad,

  1593                            gst_event_ref(newsegment_event));

  1594     }

  1595 

  1596     gst_event_unref(newsegment_event);

  1597 

  1598     nuv->priv->state = GST_NUV_DEMUX_FRAME_HEADER;

  1599     nuv->priv->offset = entry->offset;

  1600 

  1601     gst_pad_start_task(nuv->priv->sinkpad,

  1602                        (GstTaskFunction) gst_nuv_demux_loop,

  1603                        nuv->priv->sinkpad);

  1604 

  1605     GST_PAD_STREAM_UNLOCK(nuv->priv->sinkpad);

  1606     return TRUE;

  1607 

  1608   seek_error:

  1609     GST_DEBUG_OBJECT(nuv, "Got a seek error");

  1610     GST_OBJECT_UNLOCK(nuv);

  1611     GST_PAD_STREAM_UNLOCK(nuv->priv->sinkpad);

  1612     return FALSE;

  1613 

  1614 }

  1615 

  1616 static          gboolean

  1617 gst_nuv_demux_srcpad_event(GstPad * pad, GstEvent * event)

  1618 {

  1619     gboolean        res = FALSE;

  1620     GstNuvDemux    *nuv;

  1621 

  1622     nuv = GST_NUV_DEMUX(gst_pad_get_parent(pad));

  1623 

  1624     switch (GST_EVENT_TYPE(event)) {

  1625     case GST_EVENT_SEEK:

  1626         res = gst_nuv_demux_do_seek(nuv, event);

  1627         break;

  1628     default:

  1629         res = FALSE;

  1630         break;

  1631     }

  1632 

  1633     gst_object_unref(nuv);

  1634     return res;

  1635 }

  1636 

  1637 static          gboolean

  1638 gst_nuv_demux_sink_event(GstPad * pad, GstEvent * event)

  1639 {

  1640     gboolean        res = FALSE;

  1641     GstNuvDemux    *nuv;

  1642 

  1643     nuv = GST_NUV_DEMUX(gst_pad_get_parent(pad));

  1644 

  1645     switch (GST_EVENT_TYPE(event)) {

  1646     case GST_EVENT_NEWSEGMENT:

  1647         {

  1648             gboolean        update;

  1649             gdouble         rate;

  1650             GstFormat       format;

  1651             gint64          start;

  1652             gint64          stop;

  1653             gint64          position;

  1654 

  1655             gst_event_parse_new_segment(event, &update, &rate, &format,

  1656                                         &start, &stop, &position);

  1657             if ((format == GST_FORMAT_BYTES) && (start == 0)) {

  1658                 g_debug("NEW SEGMENT 0");

  1659                 if (nuv->priv->segment > 0) {

  1660                     nuv->priv->new_file = TRUE;

  1661                     nuv->priv->state = GST_NUV_DEMUX_START;

  1662                     nuv->priv->offset = 0;

  1663                 }

  1664                 nuv->priv->segment++;

  1665 

  1666                 /*

  1667                  * newsegment_event = gst_event_new_new_segment (FALSE,

  1668                  * rate, GST_FORMAT_TIME, 0, GST_CLOCK_TIME_NONE,

  1669                  * GST_CLOCK_TIME_NONE);

  1670                  * 

  1671                  * gst_pad_push_event (nuv->priv->src_audio_pad,

  1672                  * gst_event_ref (newsegment_event)); gst_pad_push_event

  1673                  * (nuv->priv->src_video_pad, gst_event_ref

  1674                  * (newsegment_event)); gst_event_unref

  1675                  * (newsegment_event); 

  1676                  */

  1677                 res = gst_pad_event_default(pad, event);

  1678             }

  1679             break;

  1680         }

  1681     case GST_EVENT_CUSTOM_DOWNSTREAM:

  1682         {

  1683             /*

  1684              * nuv->priv->new_file = TRUE; nuv->priv->state =

  1685              * GST_NUV_DEMUX_START; nuv->priv->offset = 0; 

  1686              */

  1687             GST_PAD_STREAM_LOCK(pad);

  1688             gst_nuv_demux_reset(nuv);

  1689             GST_PAD_STREAM_UNLOCK(pad);

  1690 

  1691             res = gst_pad_event_default(pad, event);

  1692             break;

  1693         }

  1694     default:

  1695         res = gst_pad_event_default(pad, event);

  1696         break;

  1697     }

  1698 

  1699     return res;

  1700 }

  1701 

  1702 static          GstFlowReturn

  1703 gst_nuv_demux_chain(GstPad * pad, GstBuffer * buf)

  1704 {

  1705     GstFlowReturn   ret = GST_FLOW_OK;

  1706     GstNuvDemux    *nuv = GST_NUV_DEMUX(gst_pad_get_parent(pad));

  1707 

  1708     if (nuv->priv->mode != NUV_PUSH_MODE)

  1709         return ret;

  1710 

  1711     gst_adapter_push(nuv->priv->adapter, buf);

  1712 

  1713     while ((ret == GST_FLOW_OK) && (nuv->priv->more_data == FALSE)) {

  1714         ret = gst_nuv_demux_play(pad);

  1715     }

  1716 

  1717     nuv->priv->more_data = FALSE;

  1718     gst_object_unref(nuv);

  1719 

  1720     return ret;

  1721 }

  1722 

  1723 static void

  1724 gst_nuv_demux_loop(GstPad * pad)

  1725 {

  1726     gst_nuv_demux_play(pad);

  1727 }

  1728 

  1729 static void

  1730 gst_nuv_demux_index_free(gpointer data, gpointer user_data)

  1731 {

  1732     g_free(data);

  1733 }

  1734 

  1735 static void

  1736 gst_nuv_demux_reset(GstNuvDemux * nuv)

  1737 {

  1738     nuv->priv->eos = FALSE;

  1739     nuv->priv->more_data = FALSE;

  1740     nuv->priv->state = GST_NUV_DEMUX_START;

  1741     nuv->priv->mode = NUV_PUSH_MODE;

  1742     nuv->priv->offset = 0;

  1743     nuv->priv->time_start = 0;

  1744     nuv->priv->time_qos = GST_CLOCK_TIME_NONE;

  1745     nuv->priv->duration_bytes = GST_CLOCK_TIME_NONE;

  1746     nuv->priv->duration_time = GST_CLOCK_TIME_NONE;

  1747     nuv->priv->last_video_return = GST_FLOW_OK;

  1748     nuv->priv->last_audio_return = GST_FLOW_OK;

  1749     nuv->priv->header_lengh = 0;

  1750     nuv->priv->segment_stop = GST_CLOCK_TIME_NONE;

  1751     nuv->priv->segment_start = GST_CLOCK_TIME_NONE;

  1752     nuv->priv->new_file = FALSE;

  1753 

  1754     // clear index list

  1755     g_slist_foreach(nuv->priv->index, gst_nuv_demux_index_free, NULL);

  1756     g_slist_free(nuv->priv->index);

  1757     nuv->priv->index = NULL;

  1758 

  1759     gst_adapter_clear(nuv->priv->adapter);

  1760 

  1761     if (nuv->priv->mpeg_buffer != NULL) {

  1762         gst_buffer_unref(nuv->priv->mpeg_buffer);

  1763         nuv->priv->mpeg_buffer = NULL;

  1764     }

  1765 }

  1766 

  1767 static void

  1768 gst_nuv_demux_destoy_src_pad(GstNuvDemux * nuv)

  1769 {

  1770     if (nuv->priv->src_video_pad) {

  1771         gst_element_remove_pad(GST_ELEMENT(nuv), nuv->priv->src_video_pad);

  1772         nuv->priv->src_video_pad = NULL;

  1773     }

  1774 

  1775     if (nuv->priv->src_audio_pad) {

  1776         gst_element_remove_pad(GST_ELEMENT(nuv), nuv->priv->src_audio_pad);

  1777         nuv->priv->src_audio_pad = NULL;

  1778     }

  1779 }

  1780 

  1781 static          GstStateChangeReturn

  1782 gst_nuv_demux_change_state(GstElement * element, GstStateChange transition)

  1783 {

  1784     GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS;

  1785 

  1786     g_debug("Nuvdemux state_change");

  1787     switch (transition) {

  1788     case GST_STATE_CHANGE_NULL_TO_READY:

  1789         gst_nuv_demux_reset(GST_NUV_DEMUX(element));

  1790         gst_nuv_demux_destoy_src_pad(GST_NUV_DEMUX(element));

  1791         break;

  1792     default:

  1793         break;

  1794     }

  1795 

  1796     g_debug("Nuvdemux state_change: 1");

  1797 

  1798     ret =

  1799         GST_ELEMENT_CLASS(parent_class)->change_state(element, transition);

  1800     if (ret == GST_STATE_CHANGE_FAILURE) {

  1801         goto done;

  1802     }

  1803 

  1804 

  1805     g_debug("Nuvdemux state_change: 2");

  1806 

  1807     switch (transition) {

  1808     case GST_STATE_CHANGE_READY_TO_NULL:

  1809         gst_nuv_demux_reset(GST_NUV_DEMUX(element));

  1810         gst_nuv_demux_destoy_src_pad(GST_NUV_DEMUX(element));

  1811         break;

  1812     default:

  1813         break;

  1814     }

  1815 

  1816 

  1817     g_debug("Nuvdemux state_change: DONE");

  1818 

  1819   done:

  1820     return ret;

  1821 }

  1822 

  1823 #if (GST_VERSION_MINOR == 10) && (GST_VERSION_MICRO < 6)

  1824 GstBuffer      *

  1825 gst_adapter_take_buffer(GstAdapter * adapter, guint nbytes)

  1826 {

  1827     GstBuffer      *buffer;

  1828     GstBuffer      *cur;

  1829     guint8         *data;

  1830 

  1831     g_return_val_if_fail(GST_IS_ADAPTER(adapter), NULL);

  1832     g_return_val_if_fail(nbytes > 0, NULL);

  1833 

  1834     GST_LOG_OBJECT(adapter, "taking buffer of %u bytes", nbytes);

  1835 

  1836     /*

  1837      * we don't have enough data, return NULL. This is unlikely as one

  1838      * usually does an _available() first instead of peeking a random

  1839      * size. 

  1840      */

  1841     if (G_UNLIKELY(nbytes > adapter->size))

  1842         return NULL;

  1843 

  1844     /*

  1845      * our head buffer has enough data left, return it 

  1846      */

  1847     cur = adapter->buflist->data;

  1848     if (GST_BUFFER_SIZE(cur) >= nbytes + adapter->skip) {

  1849         GST_LOG_OBJECT(adapter,

  1850                        "providing buffer of %d bytes via sub-buffer",

  1851                        nbytes);

  1852         buffer = gst_buffer_create_sub(cur, adapter->skip, nbytes);

  1853 

  1854         gst_adapter_flush(adapter, nbytes);

  1855 

  1856         return buffer;

  1857     }

  1858 

  1859     data = gst_adapter_take(adapter, nbytes);

  1860     if (data == NULL)

  1861         return NULL;

  1862 

  1863     buffer = gst_buffer_new();

  1864     GST_BUFFER_DATA(buffer) = data;

  1865     GST_BUFFER_MALLOCDATA(buffer) = data;

  1866     GST_BUFFER_SIZE(buffer) = nbytes;

  1867 

  1868     return buffer;

  1869 }

  1870 #endif

  1871 

  1872 static void

  1873 gst_nuv_typefind(GstTypeFind * tf, gpointer unused)

  1874 {

  1875     guint8         *data = gst_type_find_peek(tf, 0, 11);

  1876 

  1877     if (data) {

  1878         if (memcmp(data, "MythTVVideo", 11) == 0

  1879             || memcmp(data, "NuppelVideo", 11) == 0) {

  1880             gst_type_find_suggest(tf, GST_TYPE_FIND_MAXIMUM,

  1881                                   gst_caps_new_simple("video/x-nuv",

  1882                                                       NULL));

  1883         }

  1884     }

  1885 }

  1886 

  1887 static          gboolean

  1888 plugin_init(GstPlugin * plugin)

  1889 {

  1890     static gchar   *exts[] = { "nuv", NULL };

  1891 #ifdef ENABLE_NLS

  1892     setlocale(LC_ALL, "");

  1893     bindtextdomain(GETTEXT_PACKAGE, LOCALEDIR);

  1894 #endif                          /* ENABLE_NLS */

  1895 

  1896     if (!gst_element_register(plugin, "nuvdemux", GST_RANK_SECONDARY,

  1897                               GST_TYPE_NUV_DEMUX)) {

  1898         return FALSE;

  1899     }

  1900 

  1901     if (!gst_type_find_register(plugin, "video/x-nuv", GST_RANK_SECONDARY,

  1902                                 gst_nuv_typefind,

  1903                                 exts,

  1904                                 gst_caps_new_simple("video/x-nuv", NULL),

  1905                                 NULL, NULL)) {

  1906         GST_WARNING("can't register typefind");

  1907         return FALSE;

  1908     }

  1909 

  1910     return TRUE;

  1911 }

  1912 

  1913 GST_PLUGIN_DEFINE(GST_VERSION_MAJOR,

  1914                   GST_VERSION_MINOR,

  1915                   "nuvdemux",

  1916                   "Demuxes and muxes audio and video",

  1917                   plugin_init, VERSION, GST_LICENSE, GST_PACKAGE_NAME,

  1918                   GST_PACKAGE_ORIGIN)
gmyth