/*

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

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

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

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

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

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

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

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

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

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

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

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

 */

/*

 * Element-Checklist-Version: 5 

 */

/**

 * SECTION:element-nuvdemux

 *

 * <refsect2>

 * <para>

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

 * </para>

 * <para>

 * This element currently only supports pull-based scheduling.

 * </para>

 * <title>Example launch line</title>

 * <para>

 * <programlisting>

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

 * </programlisting>

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

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

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

 * right decoder elements/plugins installed.

 * </para>

 * </refsect2>

 *

 */

#ifdef HAVE_CONFIG_H

#include "config.h"

#endif

#include <gst/gst.h>

#include <gst/gsterror.h>

#include <gst/gstplugin.h>

#include <string.h>

#include <math.h>

#include "glib/gi18n.h"

#include "gstnuvdemux.h"

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

GST_DEBUG_CATEGORY_STATIC(nuvdemux_debug);

#define GST_CAT_DEFAULT nuvdemux_debug

#define GST_FLOW_ERROR_NO_DATA  -101

#define GST_FLOW_ERROR_EOS	-102

enum {

    NUV_PUSH_MODE = 0,

    NUV_PULL_MODE

};

GST_DEBUG_CATEGORY_EXTERN(GST_CAT_EVENT);

static const GstElementDetails gst_nuv_demux_details =

GST_ELEMENT_DETAILS("Nuv demuxer",

                    "Codec/Demuxer",

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

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

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

/*

 * file header 

 */

typedef struct {

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

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

    gint            i_width;

    gint            i_height;

    gint            i_width_desired;

    gint            i_height_desired;

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

    gdouble         d_aspect;   /* 1.0 squared pixel */

    gdouble         d_fps;

    // fps num/denom

    gint            i_fpsn;

    gint            i_fpsd;

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

    gint            i_audio_blocks;

    gint            i_text_blocks;

    gint            i_keyframe_distance;

} nuv_header;

/*

 * frame header 

 */

typedef struct {

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

                                 * Seekpoint (string:RTjjjjjjjj) D: Extra

                                 * data for codec */

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

                                     * RTJpeg+lzo N black frame L copy

                                     * last A: 0 uncompressed (44100

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

                                     * layer 3 F flac S shorten N null

                                     * frame loudless L copy last S: B

                                     * audio and vdeo sync point A audio

                                     * sync info (timecode == effective

                                     * dsp frequency*100) V next video

                                     * sync (timecode == next video frame

                                     * num) S audio,video,text correlation 

                                     */

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

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

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

                                 * 0x04: cartoon filter */

    gint32          i_timecode; /* ms */

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

                                 * length of packet correl */

} nuv_frame_header;

/*

 * FIXME Not sure of this one 

 */

typedef struct {

    gint            i_version;

    guint32         i_video_fcc;

    guint32         i_audio_fcc;

    gint            i_audio_sample_rate;

    gint            i_audio_bits_per_sample;

    gint            i_audio_channels;

    gint            i_audio_compression_ratio;

    gint            i_audio_quality;

    gint            i_rtjpeg_quality;

    gint            i_rtjpeg_luma_filter;

    gint            i_rtjpeg_chroma_filter;

    gint            i_lavc_bitrate;

    gint            i_lavc_qmin;

    gint            i_lavc_qmax;

    gint            i_lavc_maxqdiff;

    gint64          i_seekable_offset;

    gint64          i_keyframe_adjust_offset;

} nuv_extended_header;

typedef struct {

    gint64          timecode;

    gint64          offset;

} frame_index_data;

typedef enum {

    GST_NUV_DEMUX_START,

    GST_NUV_DEMUX_HEADER_DATA,

    GST_NUV_DEMUX_EXTRA_DATA,

    GST_NUV_DEMUX_MPEG_DATA,

    GST_NUV_DEMUX_EXTEND_HEADER,

    GST_NUV_DEMUX_EXTEND_HEADER_DATA,

    GST_NUV_DEMUX_INDEX_CREATE,

    GST_NUV_DEMUX_FRAME_HEADER,

    GST_NUV_DEMUX_MOVI,

    GST_NUV_DEMUX_INVALID_DATA

} GstNuvDemuxState;

struct _GstNuvDemuxPrivate {

    /*

     * used for indicate the mode 

     */

    guint           mode;

    /*

     * used on push mode 

     */

    GstAdapter     *adapter;

    /*

     * pads 

     */

    GstPad         *sinkpad;

    GstPad         *src_video_pad;

    GstPad         *src_audio_pad;

    /*

     * Flow control 

     */

    GstFlowReturn   last_video_return;

    GstFlowReturn   last_audio_return;

    gboolean        more_data;

    gboolean        eos;

    gboolean        new_file;

    guint           segment;

    /*

     * NUV decoding state 

     */

    GstNuvDemuxState state;

    guint64         offset;

    /*

     * duration information 

     */

    guint64         duration_bytes;

    guint64         duration_time;

    guint64         segment_stop;

    guint64         segment_start;

    /*

     * segment control info 

     */

    gboolean        new_audio_segment;

    gboolean        new_video_segment;

    /*

     * Mpeg ExtraData 

     */

    guint64         mpeg_data_size;

    GstBuffer      *mpeg_buffer;

    /*

     * Headers 

     */

    nuv_header      h;

    nuv_extended_header eh;

    nuv_frame_header fh;

    /*

     * anothers info 

     */

    guint64         header_lengh;

    gint64          time_start;

    gint64          time_diff;

    gint64          time_qos;

    guint64         last_frame_time;

    GSList         *index;

};

static GstStaticPadTemplate sink_template = GST_STATIC_PAD_TEMPLATE("sink",

                                                                    GST_PAD_SINK,

                                                                    GST_PAD_ALWAYS,

                                                                    GST_STATIC_CAPS

                                                                    ("video/x-nuv"));

static GstStaticPadTemplate audio_src_template =

GST_STATIC_PAD_TEMPLATE("audio_src",

                        GST_PAD_SRC,

                        GST_PAD_SOMETIMES,

                        GST_STATIC_CAPS_ANY);

static GstStaticPadTemplate video_src_template =

GST_STATIC_PAD_TEMPLATE("video_src",

                        GST_PAD_SRC,

                        GST_PAD_SOMETIMES,

                        GST_STATIC_CAPS_ANY);

static void     gst_nuv_demux_dispose(GObject * object);

static void     gst_nuv_demux_finalize(GObject * object);

static GstStateChangeReturn gst_nuv_demux_change_state(GstElement *

                                                       element,

                                                       GstStateChange

                                                       transition);

static void     gst_nuv_demux_loop(GstPad * pad);

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

static GstFlowReturn gst_nuv_demux_play(GstPad * pad);

static gboolean gst_nuv_demux_sink_activate_pull(GstPad * sinkpad,

                                                 gboolean active);

static gboolean gst_nuv_demux_sink_activate_push(GstPad * pad,

                                                 gboolean active);

static gboolean gst_nuv_demux_sink_activate(GstPad * sinkpad);

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

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

static frame_index_data *gst_nuv_demux_do_seek_index(GstNuvDemux * nuv,

                                                     gint64 seek_pos,

                                                     gint64 segment_stop,

                                                     GstFormat format);

static GstFlowReturn gst_nuv_demux_move_bytes(GstNuvDemux * nuv,

                                              guint64 size);

static GstFlowReturn gst_nuv_demux_read_bytes(GstNuvDemux * nuv,

                                              guint64 size, gboolean move,

                                              GstBuffer ** buffer);

static void     gst_nuv_demux_reset(GstNuvDemux * nuv);

static void     gst_nuv_demux_destoy_src_pad(GstNuvDemux * nuv);

static void     gst_nuv_demux_send_eos(GstNuvDemux * nuv);

static void     gst_nuv_demux_create_seek_index(GstNuvDemux * nuv);

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

GstBuffer      *gst_adapter_take_buffer(GstAdapter * adapter,

                                        guint nbytes);

#endif

GST_BOILERPLATE(GstNuvDemux, gst_nuv_demux, GstElement, GST_TYPE_ELEMENT);

/******************************************************************************

 * Utils function

 ******************************************************************************/

#if G_BYTE_ORDER == G_BIG_ENDIAN

static inline   gdouble

_gdouble_swap_le_be(gdouble * d)

{

    union {

        guint64         i;

        gdouble         d;

    } u;

    u.d = *d;

    u.i = GUINT64_SWAP_LE_BE(u.i);

    return u.d;

}

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

#else                           /* G_BYTE_ORDER != G_BIG_ENDIAN */

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

#endif                          /* G_BYTE_ORDER != G_BIG_ENDIAN */

static void

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

{

    if (in == 29.97) {

        *num = 30000;

        *denom = 1001;

    } else if (in == 23.976) {

        *num = 24000;

        *denom = 1001;

    } else {

        *denom = 1;

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

            *denom *= 10;

            in *= 10.0;

        }

        *num = (int) floor(in);

    }

}

/*

 * GObject Functions 

 */

static void

gst_nuv_demux_base_init(gpointer klass)

{

    GstElementClass *element_class = GST_ELEMENT_CLASS(klass);

    gst_element_class_add_pad_template(element_class,

                                       gst_static_pad_template_get

                                       (&audio_src_template));

    gst_element_class_add_pad_template(element_class,

                                       gst_static_pad_template_get

                                       (&video_src_template));

    gst_element_class_add_pad_template(element_class,

                                       gst_static_pad_template_get

                                       (&sink_template));

    gst_element_class_set_details(element_class, &gst_nuv_demux_details);

}

static void

gst_nuv_demux_class_init(GstNuvDemuxClass * klass)

{

    GstElementClass *gstelement_class = GST_ELEMENT_CLASS(klass);

    GObjectClass   *gobject_class = (GObjectClass *) klass;

    GST_DEBUG_CATEGORY_INIT(nuvdemux_debug, "nuvdemux",

                            0, "Demuxer for NUV streams");

    parent_class = g_type_class_peek_parent(klass);

    gobject_class->dispose = gst_nuv_demux_dispose;

    gobject_class->finalize = gst_nuv_demux_finalize;

    gstelement_class->change_state = gst_nuv_demux_change_state;

    g_type_class_add_private(gobject_class, sizeof(GstNuvDemuxPrivate));

}

static void

gst_nuv_demux_init(GstNuvDemux * nuv, GstNuvDemuxClass * nuv_class)

{

    nuv->priv = GST_NUV_DEMUX_GET_PRIVATE(nuv);

    nuv->priv->sinkpad =

        gst_pad_new_from_static_template(&sink_template, "sink");

    /*

     * creating adapter 

     */

    nuv->priv->mode = NUV_PUSH_MODE;

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

    nuv->priv->new_audio_segment = TRUE;

    nuv->priv->new_video_segment = TRUE;

    gst_pad_set_activate_function(nuv->priv->sinkpad,

                                  gst_nuv_demux_sink_activate);

    gst_pad_set_activatepull_function(nuv->priv->sinkpad,

                                      gst_nuv_demux_sink_activate_pull);

    gst_pad_set_activatepush_function(nuv->priv->sinkpad,

                                      gst_nuv_demux_sink_activate_push);

    gst_pad_set_chain_function(nuv->priv->sinkpad,

                               GST_DEBUG_FUNCPTR(gst_nuv_demux_chain));

    gst_pad_set_event_function(nuv->priv->sinkpad,

                               GST_DEBUG_FUNCPTR

                               (gst_nuv_demux_sink_event));

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

}

static void

gst_nuv_demux_dispose(GObject * object)

{

    GstNuvDemux    *nuv = GST_NUV_DEMUX(object);

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

        gst_buffer_unref(nuv->priv->mpeg_buffer);

    }

    gst_nuv_demux_reset(GST_NUV_DEMUX(object));

    gst_nuv_demux_destoy_src_pad(GST_NUV_DEMUX(object));

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

        gst_object_unref(nuv->priv->adapter);

    }

}

static void

gst_nuv_demux_finalize(GObject * object)

{

    G_OBJECT_CLASS(parent_class)->finalize(object);

}

/*

 * HeaderLoad: 

 */

static          GstFlowReturn

gst_nuv_demux_header_load(GstNuvDemux * nuv, nuv_header * h)

{

    GstBuffer      *buffer = NULL;

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

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

        goto done;

    }

    if (h != NULL) {

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

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

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

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

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

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

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

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

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

        /*

         * get the num and denom values from fps 

         */

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

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

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

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

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

        GST_DEBUG_OBJECT(nuv,

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

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

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

                         h->i_audio_blocks, h->i_text_blocks,

                         h->i_keyframe_distance);

    }

  done:

    if (buffer != NULL) {

        gst_buffer_unref(buffer);

        buffer = NULL;

    }

    return res;

}

static          GstFlowReturn

gst_nuv_demux_stream_header_data(GstNuvDemux * nuv)

{

    GstFlowReturn   res;

    if (nuv->priv->new_file)

        res = gst_nuv_demux_header_load(nuv, NULL);

    else

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

    if (res == GST_FLOW_OK)

        nuv->priv->state = GST_NUV_DEMUX_EXTRA_DATA;

    return res;

}

/*

 * Read NUV file tag

 */

static          GstFlowReturn

gst_nuv_demux_stream_file_header(GstNuvDemux * nuv)

{

    GstFlowReturn   res = GST_FLOW_OK;

    GstBuffer      *file_header = NULL;

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

    if (res == GST_FLOW_OK) {

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

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

            nuv->priv->state = GST_NUV_DEMUX_HEADER_DATA;

        } else {

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

            nuv->priv->state = GST_NUV_DEMUX_INVALID_DATA;

            res = GST_FLOW_ERROR;

        }

    }

    if (file_header != NULL) {

        gst_buffer_unref(file_header);

        file_header = NULL;

    }

    return res;

}

/*

 * FrameHeaderLoad: 

 */

static          GstFlowReturn

gst_nuv_demux_frame_header_load(GstNuvDemux * nuv, nuv_frame_header * h)

{

    unsigned char  *data;

    GstBuffer      *buf = NULL;

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

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

        goto done;

    }

    if (h == NULL)

        goto done;

    data = buf->data;

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

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

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

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

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

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

    GST_DEBUG_OBJECT(nuv,

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

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

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

                     h->i_timecode, h->i_length);

  done:

    if (buf != NULL) {

        gst_buffer_unref(buf);

        buf = NULL;

    }

    return res;

}

static          GstFlowReturn

gst_nuv_demux_extended_header_load(GstNuvDemux * nuv,

                                   nuv_extended_header * h)

{

    unsigned char  *data;

    GstBuffer      *buff = NULL;

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

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

        goto done;

    }

    if (h == NULL)

        goto done;

    data = buff->data;

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

    GST_DEBUG_OBJECT(nuv,

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

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

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

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

                     h->i_audio_bits_per_sample, h->i_audio_channels,

                     h->i_audio_compression_ratio, h->i_audio_quality,

                     h->i_rtjpeg_quality, h->i_rtjpeg_luma_filter,

                     h->i_rtjpeg_chroma_filter, h->i_lavc_bitrate,

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

                     h->i_seekable_offset, h->i_keyframe_adjust_offset);

  done:

    if (buff != NULL) {

        gst_buffer_unref(buff);

        buff = NULL;

    }

    return res;

}

/*

 * Query Functions 

 */

static const GstQueryType *

gst_nuv_demux_get_src_query_types(GstPad * pad)

{

    static const GstQueryType src_types[] = {

        GST_QUERY_POSITION,

        GST_QUERY_DURATION,

        0

    };

    return src_types;

}

static          gboolean

gst_nuv_demux_handle_src_query(GstPad * pad, GstQuery * query)

{

    gboolean        res = FALSE;

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

    switch (GST_QUERY_TYPE(query)) {

    case GST_QUERY_POSITION:

        {

            GstFormat       format;

            gst_query_parse_position(query, &format, NULL);

            switch (format) {

            case GST_FORMAT_TIME:

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

                    gst_query_set_position(query, GST_FORMAT_TIME,

                                           nuv->priv->last_frame_time);

                    res = TRUE;

                }

                break;

            default:

                break;

            }

            break;

        }

    case GST_QUERY_DURATION:

        {

            GstFormat       format;

            gst_query_parse_duration(query, &format, NULL);

            switch (format) {

            case GST_FORMAT_TIME:

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

                    gst_query_set_duration(query, GST_FORMAT_TIME,

                                           nuv->priv->duration_time);

                    res = TRUE;

                }

                break;

            default:

                break;

            }

            break;

        }

    default:

        break;

    }

    if (res == FALSE) {

        res = gst_pad_query_default(pad, query);

    }

    gst_object_unref(nuv);

    return res;

}

static GstPad  *

gst_nuv_demux_create_pad(GstNuvDemux * nuv, GstCaps * caps,

                         GstStaticPadTemplate * template,

                         const gchar * name)

{

    GstPad         *pad = NULL;

    pad = gst_pad_new_from_static_template(template, name);

    gst_pad_set_caps(pad, caps);

    gst_pad_set_active(pad, TRUE);

    gst_pad_use_fixed_caps(pad);

    gst_element_add_pad(GST_ELEMENT(nuv), pad);

    gst_pad_set_event_function(pad,

                               GST_DEBUG_FUNCPTR

                               (gst_nuv_demux_srcpad_event));

    gst_pad_set_query_type_function(pad,

                                    GST_DEBUG_FUNCPTR

                                    (gst_nuv_demux_get_src_query_types));

    gst_pad_set_query_function(pad,

                               GST_DEBUG_FUNCPTR

                               (gst_nuv_demux_handle_src_query));

    return pad;

}

static void

gst_nuv_demux_create_pads(GstNuvDemux * nuv)

{

    if ((nuv->priv->src_video_pad != NULL) || 

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

        return;

    }

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

        GstCaps *video_caps = NULL;

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

                                         "divxversion", G_TYPE_INT, 4,

                                         "width", G_TYPE_INT,

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

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

                                         "framerate", GST_TYPE_FRACTION,

                                         nuv->priv->h.i_fpsn,

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

                                         GST_TYPE_FOURCC,

                                         nuv->priv->eh.i_video_fcc,

                                         "pixel-aspect-ratio",

                                         GST_TYPE_FRACTION,

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

                                                 1000.0f), 1000, NULL);

        nuv->priv->src_video_pad =

            gst_nuv_demux_create_pad(nuv, video_caps, &video_src_template,

                                     "video_src");

        gst_caps_unref(video_caps);

    }

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

        GstCaps *audio_caps = NULL;

        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: magic number

                                         "mpegversion", G_TYPE_INT, nuv->priv->eh.i_version,

                                         NULL);

        nuv->priv->src_audio_pad =

            gst_nuv_demux_create_pad(nuv, audio_caps, &audio_src_template,

                                     "audio_src");

        gst_caps_unref(audio_caps);

    }

    gst_element_no_more_pads(GST_ELEMENT(nuv));

}

static          gboolean

gst_nuv_demux_validate_header(nuv_frame_header * h)

{

    gboolean        valid = FALSE;

    // g_usleep (1 * G_USEC_PER_SEC );

    switch (h->i_type) {

        /*

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

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

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

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

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

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

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

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

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

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

         */

    case 'A':

    case 'V':

    case 'S':

    case 'R':

    case 'D':

    case 'Q':

        valid = TRUE;

        break;

    default:

        valid = FALSE;

    }

    return valid;

}

static          GstFlowReturn

gst_nuv_demux_read_head_frame(GstNuvDemux * nuv)

{

    GstFlowReturn   ret = GST_FLOW_OK;

    gboolean        valid = FALSE;

    do {

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

        if (ret != GST_FLOW_OK) {

            return ret;

        }

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

            valid = TRUE;

    }

    while (valid == FALSE);

    nuv->priv->state = GST_NUV_DEMUX_MOVI;

    return ret;

}

static          gboolean

gst_nuv_combine_flow(GstNuvDemux * nuv)

{

    GstFlowReturn   ret_video = nuv->priv->last_video_return;

    GstFlowReturn   ret_audio = nuv->priv->last_audio_return;

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

        return FALSE;

    if (GST_FLOW_IS_FATAL(ret_video))

        return FALSE;

    if (GST_FLOW_IS_FATAL(ret_audio))

        return FALSE;

    return TRUE;

}

static GstFlowReturn

gst_nuv_demux_stream_data(GstNuvDemux * nuv)

{

    GstFlowReturn   ret = GST_FLOW_OK;

    GstPad         *pad = NULL;

    guint64         timestamp;

    GstBuffer      *buf = NULL;

    nuv_frame_header h;

    h = nuv->priv->fh;

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

        goto done;

    }

    if (h.i_length > 0) {

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

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

            goto done;

        }

        if ((h.i_timecode > 0) && (h.i_type == 'V')) {

            timestamp = h.i_timecode * GST_MSECOND;

            GST_BUFFER_TIMESTAMP(buf) = timestamp;

        }

    } else {

        goto done;

    }

    switch (h.i_type) {

    case 'V':

        {

            pad = nuv->priv->src_video_pad;

            if (nuv->priv->new_video_segment) {

                /*

                 * send new segment event 

                 */

                gst_pad_push_event(nuv->priv->src_video_pad,

                                   gst_event_new_new_segment(TRUE, 1.0,

                                                             GST_FORMAT_TIME,

                                                             0,

                                                             GST_CLOCK_TIME_NONE,

                                                             0));

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

                    nuv->priv->time_start = timestamp;

                }

                nuv->priv->new_video_segment = FALSE;

            }

            break;

        }

    case 'A':

        {

            pad = nuv->priv->src_audio_pad;

            if (nuv->priv->new_audio_segment) {

                /*

                 * send new segment event 

                 */

                gst_pad_push_event(nuv->priv->src_audio_pad,

                                   gst_event_new_new_segment(TRUE, 1.0,

                                                             GST_FORMAT_TIME,

                                                             0,

                                                             GST_CLOCK_TIME_NONE,

                                                             0));

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

                    nuv->priv->time_start = timestamp;

                }

                nuv->priv->new_audio_segment = FALSE;

            }

            break;

        }

    case 'S':

        {

            switch (h.i_compression) {

            case 'V':

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

                                 h.i_timecode);

                gst_pad_push_event(nuv->priv->src_video_pad,

                                   gst_event_new_new_segment(TRUE, 1.0,

                                                             GST_FORMAT_TIME,

                                                             h.i_timecode *

                                                             GST_MSECOND,

                                                             GST_CLOCK_TIME_NONE,

                                                             0));

                break;

            case 'A':

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

                                 h.i_timecode);

                gst_pad_push_event(nuv->priv->src_audio_pad,

                                   gst_event_new_new_segment(TRUE, 1.0,

                                                             GST_FORMAT_TIME,

                                                             0,

                                                             GST_CLOCK_TIME_NONE,

                                                             0));

                break;

            default:

                break;

            }

            goto done;

        }

    default:

        break;

    }

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

        /*

         * pushing the buffer 

         */

        gst_buffer_set_caps(buf, GST_PAD_CAPS(pad));

        ret = gst_pad_push(pad, buf);

        buf = NULL;

        if (ret != GST_FLOW_OK) {

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

                               gst_pad_get_name(pad));

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

                nuv->priv->last_video_return = ret;

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

                nuv->priv->last_audio_return = ret;

            }

            /*