gstffmpegcodecmap.c 71.5 KB
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/* GStreamer
 * Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
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 * This file:
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 * Copyright (c) 2002-2004 Ronald Bultje <rbultje@ronald.bitfreak.net>
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 *
 * 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.
 */

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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <gst/gst.h>
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#ifdef HAVE_FFMPEG_UNINSTALLED
#include <avcodec.h>
#else
#include <ffmpeg/avcodec.h>
#endif
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#include <string.h>
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#include "gstffmpeg.h"
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#include "gstffmpegcodecmap.h"

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/*
 * Read a palette from a caps.
 */

static void
gst_ffmpeg_get_palette (const GstCaps *caps, AVCodecContext *context)
{
  GstStructure *str = gst_caps_get_structure (caps, 0);
  const GValue *palette_v;
  const GstBuffer *palette;

  /* do we have a palette? */
  if ((palette_v = gst_structure_get_value (str,
          "palette_data")) && context) {
    palette = g_value_get_boxed (palette_v);
    if (GST_BUFFER_SIZE (palette) >= 256 * 4) {
      if (context->palctrl)
        av_free (context->palctrl);
      context->palctrl = av_malloc (sizeof (AVPaletteControl));
      context->palctrl->palette_changed = 1;
      memcpy (context->palctrl->palette, GST_BUFFER_DATA (palette),
          AVPALETTE_SIZE);
    }
  }
}

static void
gst_ffmpeg_set_palette (GstCaps *caps, AVCodecContext *context)
{
  if (context->palctrl) {
    GstBuffer *palette = gst_buffer_new_and_alloc (256 * 4);

    memcpy (GST_BUFFER_DATA (palette), context->palctrl->palette,
        AVPALETTE_SIZE);
    gst_caps_set_simple (caps,
        "palette_data", GST_TYPE_BUFFER, palette, NULL);
  }
}

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/* this macro makes a caps width fixed or unfixed width/height
 * properties depending on whether we've got a context.
 *
 * See below for why we use this.
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 *
 * We should actually do this stuff at the end, like in riff-media.c,
 * but I'm too lazy today. Maybe later.
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 */

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#define GST_FF_VID_CAPS_NEW(mimetype, ...)			\
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    (context != NULL) ?						\
    gst_caps_new_simple (mimetype,			      	\
	"width",     G_TYPE_INT,   context->width,	      	\
	"height",    G_TYPE_INT,   context->height,	  	\
	"framerate", G_TYPE_DOUBLE, 1. * context->frame_rate /  \
				   context->frame_rate_base,    \
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	__VA_ARGS__, NULL)  					\
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    :	  							\
    gst_caps_new_simple (mimetype,			      	\
	"width",     GST_TYPE_INT_RANGE, 16, 4096,      	\
	"height",    GST_TYPE_INT_RANGE, 16, 4096,	      	\
	"framerate", GST_TYPE_DOUBLE_RANGE, 0., G_MAXDOUBLE,	\
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	__VA_ARGS__, NULL)
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/* same for audio - now with channels/sample rate
 */

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#define GST_FF_AUD_CAPS_NEW(mimetype, ...)			\
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    (context != NULL) ?					      	\
    gst_caps_new_simple (mimetype,	      			\
	"rate", G_TYPE_INT, context->sample_rate,		\
	"channels", G_TYPE_INT, context->channels,		\
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	__VA_ARGS__, NULL)					\
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    :								\
    gst_caps_new_simple (mimetype,	      			\
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        "rate", GST_TYPE_INT_RANGE, 8000, 96000,		\
	"channels", GST_TYPE_INT_RANGE, 1, 2,			\
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	__VA_ARGS__, NULL)
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/* Convert a FFMPEG codec ID and optional AVCodecContext
 * to a GstCaps. If the context is ommitted, no fixed values
 * for video/audio size will be included in the GstCaps
 *
 * CodecID is primarily meant for compressed data GstCaps!
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 *
 * encode is a special parameter. gstffmpegdec will say
 * FALSE, gstffmpegenc will say TRUE. The output caps
 * depends on this, in such a way that it will be very
 * specific, defined, fixed and correct caps for encoders,
 * yet very wide, "forgiving" caps for decoders. Example
 * for mp3: decode: audio/mpeg,mpegversion=1,layer=[1-3]
 * but encode: audio/mpeg,mpegversion=1,layer=3,bitrate=x,
 * rate=x,channels=x.
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 */

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GstCaps *
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gst_ffmpeg_codecid_to_caps (enum CodecID codec_id,
    AVCodecContext * context, gboolean encode)
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{
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  GstCaps *caps = NULL;
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  gboolean buildcaps = FALSE;
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  switch (codec_id) {
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    case CODEC_ID_MPEG1VIDEO:
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      /* For decoding, CODEC_ID_MPEG2VIDEO is preferred... So omit here */
      if (encode) {
        /* FIXME: bitrate */
        caps = GST_FF_VID_CAPS_NEW ("video/mpeg",
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            "mpegversion", G_TYPE_INT, 1,
            "systemstream", G_TYPE_BOOLEAN, FALSE, NULL);
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      }
      break;

    case CODEC_ID_MPEG2VIDEO:
      if (encode) {
        /* FIXME: bitrate */
        caps = GST_FF_VID_CAPS_NEW ("video/mpeg",
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            "mpegversion", G_TYPE_INT, 2,
            "systemstream", G_TYPE_BOOLEAN, FALSE, NULL);
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      } else {
        /* decode both MPEG-1 and MPEG-2; width/height/fps are all in
         * the MPEG video stream headers, so may be omitted from caps. */
        caps = gst_caps_new_simple ("video/mpeg",
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            "mpegversion", GST_TYPE_INT_RANGE, 1, 2,
            "systemstream", G_TYPE_BOOLEAN, FALSE, NULL);
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      }
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      break;
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    case CODEC_ID_MPEG2VIDEO_XVMC:
      /* this is a special ID - don't need it in GStreamer, I think */
      break;

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      /* I don't know the exact differences between those... Anyone? */
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    case CODEC_ID_H263:
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    case CODEC_ID_H263P:
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      caps = GST_FF_VID_CAPS_NEW ("video/x-h263", NULL);
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      break;
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    case CODEC_ID_H263I:
      caps = GST_FF_VID_CAPS_NEW ("video/x-intel-h263", NULL);
      break;

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    case CODEC_ID_H261:
      caps = GST_FF_VID_CAPS_NEW ("video/x-h261", NULL);
      break;

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    case CODEC_ID_RV10:
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    case CODEC_ID_RV20:
      do {
        gint version = (codec_id == CODEC_ID_RV10) ? 1 : 2;

        /* FIXME: context->sub_id must be filled in during decoding */
        caps = GST_FF_VID_CAPS_NEW ("video/x-pn-realvideo",
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            "systemstream", G_TYPE_BOOLEAN, FALSE,
            "rmversion", G_TYPE_INT, version, NULL);
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        if (context) {
          gst_caps_set_simple (caps,
              "rmsubid", GST_TYPE_FOURCC, context->sub_id, NULL);
        }
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      } while (0);
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      break;
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    case CODEC_ID_MP2:
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      /* we use CODEC_ID_MP3 for decoding */
      if (encode) {
        /* FIXME: bitrate */
        caps = GST_FF_AUD_CAPS_NEW ("audio/mpeg",
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            "mpegversion", G_TYPE_INT, 1, "layer", G_TYPE_INT, 2, NULL);
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      }
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      break;
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    case CODEC_ID_MP3:
      if (encode) {
        /* FIXME: bitrate */
        caps = GST_FF_AUD_CAPS_NEW ("audio/mpeg",
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            "mpegversion", G_TYPE_INT, 1, "layer", G_TYPE_INT, 3, NULL);
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      } else {
        /* Decodes MPEG-1 layer 1/2/3. Samplerate, channels et al are
         * in the MPEG audio header, so may be omitted from caps. */
        caps = gst_caps_new_simple ("audio/mpeg",
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            "mpegversion", G_TYPE_INT, 1,
            "layer", GST_TYPE_INT_RANGE, 1, 3, NULL);
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      }
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      break;
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    case CODEC_ID_VORBIS:
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      /* This one is disabled for several reasons:
       * - GStreamer already has perfect Ogg and Vorbis support
       * - The ffmpeg implementation depends on libvorbis/libogg,
       *   which are not included in the ffmpeg that GStreamer ships.
       * - The ffmpeg implementation depends on shared objects between
       *   the ogg demuxer and vorbis decoder, which GStreamer doesn't.
       */
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      break;
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    case CODEC_ID_AC3:
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      /* Decoding is disabled, because:
       * - it depends on liba52, which we don't ship in ffmpeg.
       * - we already have a liba52 plugin ourselves.
       */
      if (encode) {
        /* FIXME: bitrate */
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        caps = GST_FF_AUD_CAPS_NEW ("audio/x-ac3", NULL);
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      }
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      break;
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      /* MJPEG is normal JPEG, Motion-JPEG and Quicktime MJPEG-A. MJPEGB
       * is Quicktime's MJPEG-B. LJPEG is lossless JPEG. I don't know what
       * sp5x is, but it's apparently something JPEG... We don't separate
       * between those in GStreamer. Should we (at least between MJPEG,
       * MJPEG-B and sp5x decoding...)? */
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    case CODEC_ID_MJPEG:
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    case CODEC_ID_LJPEG:
    case CODEC_ID_SP5X:
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      caps = GST_FF_VID_CAPS_NEW ("image/jpeg", NULL);
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      break;
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    case CODEC_ID_MJPEGB:
      caps = GST_FF_VID_CAPS_NEW ("video/x-mjpeg-b", NULL);
      break;

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    case CODEC_ID_MPEG4:
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      if (encode && context != NULL) {
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        /* I'm not exactly sure what ffmpeg outputs... ffmpeg itself uses
         * the AVI fourcc 'DIVX', but 'mp4v' for Quicktime... */
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        switch (context->codec_tag) {
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          case GST_MAKE_FOURCC ('D', 'I', 'V', 'X'):
            caps = GST_FF_VID_CAPS_NEW ("video/x-divx",
	        "divxversion", G_TYPE_INT, 5, NULL);
            break;
          case GST_MAKE_FOURCC ('m', 'p', '4', 'v'):
          default:
            /* FIXME: bitrate */
            caps = GST_FF_VID_CAPS_NEW ("video/mpeg",
                "systemstream", G_TYPE_BOOLEAN, FALSE,
                "mpegversion", G_TYPE_INT, 4, NULL);
            break;
        }
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      } else {
        /* The trick here is to separate xvid, divx, mpeg4, 3ivx et al */
        caps = GST_FF_VID_CAPS_NEW ("video/mpeg",
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            "mpegversion", G_TYPE_INT, 4,
            "systemstream", G_TYPE_BOOLEAN, FALSE, NULL);
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        if (encode) {
          gst_caps_append (caps, GST_FF_VID_CAPS_NEW ("video/x-divx",
              "divxversion", G_TYPE_INT, 5, NULL));
        } else {
          gst_caps_append (caps, GST_FF_VID_CAPS_NEW ("video/x-divx",
              "divxversion", GST_TYPE_INT_RANGE, 4, 5, NULL));
          gst_caps_append (caps, GST_FF_VID_CAPS_NEW ("video/x-xvid", NULL));
          gst_caps_append (caps, GST_FF_VID_CAPS_NEW ("video/x-3ivx", NULL));
        }
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      }
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      break;
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    case CODEC_ID_RAWVIDEO:
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      caps = gst_ffmpeg_codectype_to_caps (CODEC_TYPE_VIDEO, context);
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      break;
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    case CODEC_ID_MSMPEG4V1:
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    case CODEC_ID_MSMPEG4V2:
    case CODEC_ID_MSMPEG4V3:
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      do {
        gint version = 41 + codec_id - CODEC_ID_MSMPEG4V1;

        /* encode-FIXME: bitrate */
        caps = GST_FF_VID_CAPS_NEW ("video/x-msmpeg",
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            "msmpegversion", G_TYPE_INT, version, NULL);
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        if (!encode && codec_id == CODEC_ID_MSMPEG4V3) {
          gst_caps_append (caps, GST_FF_VID_CAPS_NEW ("video/x-divx",
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              "divxversion", G_TYPE_INT, 3, NULL));
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        }
      } while (0);
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      break;
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    case CODEC_ID_WMV1:
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    case CODEC_ID_WMV2:
      do {
        gint version = (codec_id == CODEC_ID_WMV1) ? 1 : 2;

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        caps = GST_FF_VID_CAPS_NEW ("video/x-wmv",
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            "wmvversion", G_TYPE_INT, version, NULL);
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      } while (0);
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      break;
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    case CODEC_ID_FLV1:
      buildcaps = TRUE;
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      break;
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    case CODEC_ID_SVQ1:
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      caps = GST_FF_VID_CAPS_NEW ("video/x-svq",
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          "svqversion", G_TYPE_INT, 1, NULL);
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      break;
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    case CODEC_ID_SVQ3:
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      caps = GST_FF_VID_CAPS_NEW ("video/x-svq",
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          "svqversion", G_TYPE_INT, 3,
          "halfpel_flag", GST_TYPE_INT_RANGE, 0, 1,
          "thirdpel_flag", GST_TYPE_INT_RANGE, 0, 1,
          "low_delay", GST_TYPE_INT_RANGE, 0, 1,
          "unknown_svq3_flag", GST_TYPE_INT_RANGE, 0, 1, NULL);
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      break;
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    case CODEC_ID_DVAUDIO:
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      caps = GST_FF_AUD_CAPS_NEW ("audio/x-dv", NULL);
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      break;
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    case CODEC_ID_DVVIDEO:
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      caps = GST_FF_VID_CAPS_NEW ("video/x-dv",
          "systemstream", G_TYPE_BOOLEAN, FALSE,
          NULL);
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      break;
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    case CODEC_ID_WMAV1:
    case CODEC_ID_WMAV2:
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      do {
        gint version = (codec_id == CODEC_ID_WMAV1) ? 1 : 2;

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        if (context) {
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          caps = GST_FF_AUD_CAPS_NEW ("audio/x-wma",
             "wmaversion", G_TYPE_INT, version,
             "block_align", G_TYPE_INT, context->block_align,
             "bitrate", G_TYPE_INT, context->bit_rate, NULL);
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        } else {
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          caps = GST_FF_AUD_CAPS_NEW ("audio/x-wma",
             "wmaversion", G_TYPE_INT, version,
             "block_align", GST_TYPE_INT_RANGE, 0, G_MAXINT,
             "bitrate", GST_TYPE_INT_RANGE, 0, G_MAXINT, NULL);
        }
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      } while (0);
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      break;
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    case CODEC_ID_MACE3:
    case CODEC_ID_MACE6:
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      do {
        gint version = (codec_id == CODEC_ID_MACE3) ? 3 : 6;

        caps = GST_FF_AUD_CAPS_NEW ("audio/x-mace",
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            "maceversion", G_TYPE_INT, version, NULL);
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      } while (0);
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      break;
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    case CODEC_ID_HUFFYUV:
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      caps = GST_FF_VID_CAPS_NEW ("video/x-huffyuv", NULL);
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      if (context) {
        gst_caps_set_simple (caps,
            "bpp", G_TYPE_INT, context->bits_per_sample, NULL);
      }
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      break;

    case CODEC_ID_CYUV:
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      buildcaps = TRUE;
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      break;

    case CODEC_ID_H264:
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      caps = GST_FF_VID_CAPS_NEW ("video/x-h264", NULL);
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      break;

    case CODEC_ID_INDEO3:
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      caps = GST_FF_VID_CAPS_NEW ("video/x-indeo",
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          "indeoversion", G_TYPE_INT, 3, NULL);
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      break;

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    case CODEC_ID_INDEO2:
      caps = GST_FF_VID_CAPS_NEW ("video/x-indeo",
          "indeoversion", G_TYPE_INT, 2, NULL);
      break;

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    case CODEC_ID_VP3:
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      caps = GST_FF_VID_CAPS_NEW ("video/x-vp3", NULL);
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      break;

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    case CODEC_ID_THEORA:
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      caps = GST_FF_VID_CAPS_NEW ("video/x-theora", NULL);
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      break;

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    case CODEC_ID_AAC:
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    case CODEC_ID_MPEG4AAC:
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      caps = GST_FF_AUD_CAPS_NEW ("audio/mpeg",
          "mpegversion", G_TYPE_INT, 4, NULL);
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      break;

    case CODEC_ID_ASV1:
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    case CODEC_ID_ASV2:
      buildcaps = TRUE;
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      break;

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    case CODEC_ID_FFV1:
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      caps = GST_FF_VID_CAPS_NEW ("video/x-ffv",
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          "ffvversion", G_TYPE_INT, 1, NULL);
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      break;

    case CODEC_ID_4XM:
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      caps = GST_FF_VID_CAPS_NEW ("video/x-4xm", NULL);
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      break;

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    case CODEC_ID_XAN_WC3:
    case CODEC_ID_XAN_WC4:
      caps = GST_FF_VID_CAPS_NEW ("video/x-xan",
          "wcversion", G_TYPE_INT, 3 - CODEC_ID_XAN_WC3 + codec_id, NULL);
      break;

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    case CODEC_ID_VCR1:
    case CODEC_ID_CLJR:
    case CODEC_ID_MDEC:
    case CODEC_ID_ROQ:
    case CODEC_ID_INTERPLAY_VIDEO:
      buildcaps = TRUE;
      break;

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    case CODEC_ID_RPZA:
      caps = GST_FF_VID_CAPS_NEW ("video/x-apple-video", NULL);
      break;

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    case CODEC_ID_CINEPAK:
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      caps = GST_FF_VID_CAPS_NEW ("video/x-cinepak", NULL);
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      break;

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    /* WS_VQA belogns here (order) */

    case CODEC_ID_MSRLE:
      caps = GST_FF_VID_CAPS_NEW ("video/x-rle",
	  "layout", G_TYPE_STRING, "microsoft", NULL);
      if (context) {
        gst_caps_set_simple (caps,
	    "depth", G_TYPE_INT, (gint) context->bits_per_sample, NULL);
      } else {
        gst_caps_set_simple (caps, "depth", GST_TYPE_INT_RANGE, 1, 64, NULL);
      }
      break;

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    case CODEC_ID_MSVIDEO1:
      caps = GST_FF_VID_CAPS_NEW ("video/x-msvideocodec",
	  "msvideoversion", G_TYPE_INT, 1, NULL);
      break;

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    case CODEC_ID_WMV3:
    case CODEC_ID_VC9:
      caps = GST_FF_VID_CAPS_NEW ("video/x-wmv",
          "wmvversion", G_TYPE_INT, 3, NULL);
      break;

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    case CODEC_ID_WS_VQA:
    case CODEC_ID_IDCIN:
    case CODEC_ID_8BPS:
    case CODEC_ID_SMC:
    case CODEC_ID_FLIC:
    case CODEC_ID_TRUEMOTION1:
    case CODEC_ID_VMDVIDEO:
    case CODEC_ID_VMDAUDIO:
    case CODEC_ID_MSZH:
    case CODEC_ID_ZLIB:
    case CODEC_ID_QTRLE:
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    case CODEC_ID_SONIC:
    case CODEC_ID_SONIC_LS:
    case CODEC_ID_SNOW:
    case CODEC_ID_TSCC:
    case CODEC_ID_ULTI:
    case CODEC_ID_QDRAW:
    case CODEC_ID_VIXL:
    case CODEC_ID_QPEG:
    case CODEC_ID_XVID:
    case CODEC_ID_PNG:
    case CODEC_ID_PPM:
    case CODEC_ID_PBM:
    case CODEC_ID_PGM:
    case CODEC_ID_PGMYUV:
    case CODEC_ID_PAM:
    case CODEC_ID_FFVHUFF:
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    case CODEC_ID_LOCO:
    case CODEC_ID_WNV1:
    case CODEC_ID_AASC:
    case CODEC_ID_MP3ADU:
    case CODEC_ID_MP3ON4:
    case CODEC_ID_WESTWOOD_SND1:
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      buildcaps = TRUE;
      break;

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      /* weird quasi-codecs for the demuxers only */
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    case CODEC_ID_PCM_S16LE:
    case CODEC_ID_PCM_S16BE:
    case CODEC_ID_PCM_U16LE:
    case CODEC_ID_PCM_U16BE:
    case CODEC_ID_PCM_S8:
    case CODEC_ID_PCM_U8:
      do {
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        gint width = 0, depth = 0, endianness = 0;
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        gboolean signedness = FALSE;    /* blabla */
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        switch (codec_id) {
          case CODEC_ID_PCM_S16LE:
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            width = 16;
            depth = 16;
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            endianness = G_LITTLE_ENDIAN;
            signedness = TRUE;
            break;
          case CODEC_ID_PCM_S16BE:
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            width = 16;
            depth = 16;
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            endianness = G_BIG_ENDIAN;
            signedness = TRUE;
            break;
          case CODEC_ID_PCM_U16LE:
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            width = 16;
            depth = 16;
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            endianness = G_LITTLE_ENDIAN;
            signedness = FALSE;
            break;
          case CODEC_ID_PCM_U16BE:
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            width = 16;
            depth = 16;
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            endianness = G_BIG_ENDIAN;
            signedness = FALSE;
            break;
          case CODEC_ID_PCM_S8:
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            width = 8;
            depth = 8;
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            endianness = G_BYTE_ORDER;
            signedness = TRUE;
            break;
          case CODEC_ID_PCM_U8:
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            width = 8;
            depth = 8;
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            endianness = G_BYTE_ORDER;
            signedness = FALSE;
            break;
          default:
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            g_assert (0);       /* don't worry, we never get here */
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            break;
        }

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        caps = GST_FF_AUD_CAPS_NEW ("audio/x-raw-int",
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            "width", G_TYPE_INT, width,
            "depth", G_TYPE_INT, depth,
            "endianness", G_TYPE_INT, endianness,
            "signed", G_TYPE_BOOLEAN, signedness, NULL);
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      } while (0);
      break;

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    case CODEC_ID_PCM_MULAW:
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      caps = GST_FF_AUD_CAPS_NEW ("audio/x-mulaw", NULL);
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      break;

    case CODEC_ID_PCM_ALAW:
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      caps = GST_FF_AUD_CAPS_NEW ("audio/x-alaw", NULL);
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      break;

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    case CODEC_ID_ADPCM_IMA_QT:
    case CODEC_ID_ADPCM_IMA_WAV:
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    case CODEC_ID_ADPCM_IMA_DK3:
    case CODEC_ID_ADPCM_IMA_DK4:
    case CODEC_ID_ADPCM_IMA_WS:
    case CODEC_ID_ADPCM_IMA_SMJPEG:
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    case CODEC_ID_ADPCM_MS:
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    case CODEC_ID_ADPCM_4XM:
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    case CODEC_ID_ADPCM_XA:
    case CODEC_ID_ADPCM_ADX:
    case CODEC_ID_ADPCM_EA:
    case CODEC_ID_ADPCM_G726:
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    case CODEC_ID_ADPCM_CT:
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    case CODEC_ID_ADPCM_SWF:
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      do {
        gchar *layout = NULL;

        switch (codec_id) {
          case CODEC_ID_ADPCM_IMA_QT:
            layout = "quicktime";
            break;
          case CODEC_ID_ADPCM_IMA_WAV:
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            layout = "dvi";
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            break;
          case CODEC_ID_ADPCM_IMA_DK3:
            layout = "dk3";
            break;
          case CODEC_ID_ADPCM_IMA_DK4:
            layout = "dk4";
            break;
          case CODEC_ID_ADPCM_IMA_WS:
            layout = "westwood";
            break;
          case CODEC_ID_ADPCM_IMA_SMJPEG:
            layout = "smjpeg";
            break;
          case CODEC_ID_ADPCM_MS:
            layout = "microsoft";
            break;
          case CODEC_ID_ADPCM_4XM:
            layout = "4xm";
            break;
          case CODEC_ID_ADPCM_XA:
            layout = "xa";
            break;
          case CODEC_ID_ADPCM_ADX:
            layout = "adx";
            break;
          case CODEC_ID_ADPCM_EA:
            layout = "ea";
            break;
          case CODEC_ID_ADPCM_G726:
            layout = "g726";
            break;
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          case CODEC_ID_ADPCM_CT:
            layout = "ct";
            break;
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          case CODEC_ID_ADPCM_SWF:
            layout = "swf";
            break;
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          default:
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            g_assert (0);       /* don't worry, we never get here */
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            break;
        }

        /* FIXME: someone please check whether we need additional properties
         * in this caps definition. */
        caps = GST_FF_AUD_CAPS_NEW ("audio/x-adpcm",
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            "layout", G_TYPE_STRING, layout, NULL);
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        if (context)
          gst_caps_set_simple (caps,
              "block_align", G_TYPE_INT, context->block_align,
              "bitrate", G_TYPE_INT, context->bit_rate, NULL);
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      } while (0);
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      break;

    case CODEC_ID_AMR_NB:
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      caps = GST_FF_AUD_CAPS_NEW ("audio/x-amr-nb", NULL);
      break;

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    case CODEC_ID_AMR_WB:
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      caps = GST_FF_AUD_CAPS_NEW ("audio/x-amr-wb", NULL);
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      break;

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    case CODEC_ID_RA_144:
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    case CODEC_ID_RA_288:
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      do {
        gint version = (codec_id == CODEC_ID_RA_144) ? 1 : 2;

        /* FIXME: properties? */
        caps = GST_FF_AUD_CAPS_NEW ("audio/x-pn-realaudio",
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            "raversion", G_TYPE_INT, version, NULL);
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      } while (0);
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      break;
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    case CODEC_ID_ROQ_DPCM:
    case CODEC_ID_INTERPLAY_DPCM:
    case CODEC_ID_XAN_DPCM:
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    case CODEC_ID_SOL_DPCM:
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      do {
        gchar *layout = NULL;

        switch (codec_id) {
          case CODEC_ID_ROQ_DPCM:
            layout = "roq";
            break;
          case CODEC_ID_INTERPLAY_DPCM:
            layout = "interplay";
            break;
          case CODEC_ID_XAN_DPCM:
            layout = "xan";
            break;
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          case CODEC_ID_SOL_DPCM:
            layout = "sol";
            break;
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          default:
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            g_assert (0);       /* don't worry, we never get here */
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            break;
        }

        /* FIXME: someone please check whether we need additional properties
         * in this caps definition. */
        caps = GST_FF_AUD_CAPS_NEW ("audio/x-dpcm",
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            "layout", G_TYPE_STRING, layout, NULL);
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        if (context)
          gst_caps_set_simple (caps,
              "block_align", G_TYPE_INT, context->block_align,
              "bitrate", G_TYPE_INT, context->bit_rate, NULL);
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      } while (0);
      break;
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    case CODEC_ID_SHORTEN:
      caps = gst_caps_new_simple ("audio/x-shorten", NULL);
      break;

    case CODEC_ID_ALAC:
      caps = GST_FF_AUD_CAPS_NEW ("audio/x-alac", NULL);
      if (context) {
        gst_caps_set_simple (caps,
            "samplesize", G_TYPE_INT, context->bits_per_sample, NULL);
      }
      break;

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    case CODEC_ID_FLAC:
      /* Note that ffmpeg has no encoder yet, but just for safety. In the
       * encoder case, we want to add things like samplerate, channels... */
      if (!encode) {
        caps = gst_caps_new_simple ("audio/x-flac", NULL);
      }
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      break;

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    default:
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      g_warning ("Unknown codec ID %d, please add here", codec_id);
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      break;
  }

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  if (buildcaps) {
    AVCodec *codec;

    if ((codec = avcodec_find_decoder (codec_id)) ||
        (codec = avcodec_find_encoder (codec_id))) {
      gchar *mime = NULL;

      switch (codec->type) {
        case CODEC_TYPE_VIDEO:
          mime = g_strdup_printf ("video/x-gst_ff-%s", codec->name);
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          caps = GST_FF_VID_CAPS_NEW (mime, NULL);
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          g_free (mime);
          break;
        case CODEC_TYPE_AUDIO:
          mime = g_strdup_printf ("audio/x-gst_ff-%s", codec->name);
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          caps = GST_FF_AUD_CAPS_NEW (mime, NULL);
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          if (context)
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            gst_caps_set_simple (caps,
                "block_align", G_TYPE_INT, context->block_align,
                "bitrate", G_TYPE_INT, context->bit_rate, NULL);
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          g_free (mime);
          break;
        default:
          break;
      }
    }
  }

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  if (caps != NULL) {
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    char *str;

    /* set private data */
    if (context && context->extradata_size > 0) {
      GstBuffer *data = gst_buffer_new_and_alloc (context->extradata_size);
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      memcpy (GST_BUFFER_DATA (data), context->extradata,
          context->extradata_size);
      gst_caps_set_simple (caps,
          "codec_data", GST_TYPE_BUFFER, data, NULL);
      gst_buffer_unref (data);
    }

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    /* palette */
    if (context) {
      gst_ffmpeg_set_palette (caps, context);
    }

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    str = gst_caps_to_string (caps);
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    GST_DEBUG ("caps for codec_id=%d: %s", codec_id, str);
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    g_free (str);
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  } else {
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    GST_WARNING ("No caps found for codec_id=%d", codec_id);
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  }

  return caps;
}

/* Convert a FFMPEG Pixel Format and optional AVCodecContext
 * to a GstCaps. If the context is ommitted, no fixed values
 * for video/audio size will be included in the GstCaps
 *
 * See below for usefullness
 */

static GstCaps *
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gst_ffmpeg_pixfmt_to_caps (enum PixelFormat pix_fmt, AVCodecContext * context)
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{
  GstCaps *caps = NULL;

  int bpp = 0, depth = 0, endianness = 0;
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  gulong g_mask = 0, r_mask = 0, b_mask = 0, a_mask = 0;
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  guint32 fmt = 0;
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  switch (pix_fmt) {
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    case PIX_FMT_YUVJ420P:
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    case PIX_FMT_YUV420P:
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      fmt = GST_MAKE_FOURCC ('I', '4', '2', '0');
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      break;
    case PIX_FMT_YUV422:
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      fmt = GST_MAKE_FOURCC ('Y', 'U', 'Y', '2');
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      break;
    case PIX_FMT_RGB24:
      bpp = depth = 24;
      endianness = G_BIG_ENDIAN;
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      r_mask = 0xff0000;
      g_mask = 0x00ff00;
      b_mask = 0x0000ff;
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      break;
    case PIX_FMT_BGR24:
      bpp = depth = 24;
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      endianness = G_BIG_ENDIAN;
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      r_mask = 0x0000ff;
      g_mask = 0x00ff00;
      b_mask = 0xff0000;
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      break;
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    case PIX_FMT_YUVJ422P:
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    case PIX_FMT_YUV422P:
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      fmt = GST_MAKE_FOURCC ('Y', '4', '2', 'B');
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      break;
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    case PIX_FMT_YUVJ444P:
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    case PIX_FMT_YUV444P:
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      fmt = GST_MAKE_FOURCC ('Y', '4', '4', '4');
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      break;
    case PIX_FMT_RGBA32:
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      bpp = 32;
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      depth = 32;
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      endianness = G_BIG_ENDIAN;
#if (G_BYTE_ORDER == G_BIG_ENDIAN)
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      r_mask = 0x000000ff;
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      g_mask = 0x0000ff00;
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      b_mask = 0x00ff0000;
      a_mask = 0xff000000;
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#else
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      r_mask = 0xff000000;
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      g_mask = 0x00ff0000;
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      b_mask = 0x0000ff00;
      a_mask = 0x000000ff;
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#endif
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      break;
    case PIX_FMT_YUV410P:
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      fmt = GST_MAKE_FOURCC ('Y', 'U', 'V', '9');
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      break;
    case PIX_FMT_YUV411P:
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      fmt = GST_MAKE_FOURCC ('Y', '4', '1', 'B');
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      break;
    case PIX_FMT_RGB565:
      bpp = depth = 16;
      endianness = G_BYTE_ORDER;
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      r_mask = 0xf800;
      g_mask = 0x07e0;
      b_mask = 0x001f;
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      break;
    case PIX_FMT_RGB555:
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      bpp = 16;
      depth = 15;
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      endianness = G_BYTE_ORDER;
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      r_mask = 0x7c00;
      g_mask = 0x03e0;
      b_mask = 0x001f;
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      break;
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    case PIX_FMT_PAL8:
      bpp = depth = 8;
      endianness = G_BYTE_ORDER;
      break;
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    case PIX_FMT_GRAY8:
      bpp = depth = 8;
      caps = GST_FF_VID_CAPS_NEW ("video/x-raw-gray",
				  "bpp", G_TYPE_INT, bpp,
				  "depth", G_TYPE_INT, depth, NULL);
      break;
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    default:
      /* give up ... */
      break;
  }
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  if (caps == NULL) {
    if (bpp != 0) {
      if (r_mask != 0) {
	caps = GST_FF_VID_CAPS_NEW ("video/x-raw-rgb",
				    "bpp", G_TYPE_INT, bpp,
				    "depth", G_TYPE_INT, depth,
				    "red_mask", G_TYPE_INT, r_mask,
				    "green_mask", G_TYPE_INT, g_mask,
				    "blue_mask", G_TYPE_INT, b_mask,
				    "endianness", G_TYPE_INT, endianness, NULL);
	if (a_mask) {
	  gst_caps_set_simple (caps, "alpha_mask", G_TYPE_INT, a_mask, NULL);
	}
      } else {
	caps = GST_FF_VID_CAPS_NEW ("video/x-raw-rgb",
				    "bpp", G_TYPE_INT, bpp,
				    "depth", G_TYPE_INT, depth,
				    "endianness", G_TYPE_INT, endianness, NULL);
	if (context) {
	  gst_ffmpeg_set_palette (caps, context);
	}
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      }
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    } else if (fmt) {
      caps = GST_FF_VID_CAPS_NEW ("video/x-raw-yuv",
				  "format", GST_TYPE_FOURCC, fmt, NULL);
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    }
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  }

  if (caps != NULL) {
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    char *str = gst_caps_to_string (caps);
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    GST_DEBUG ("caps for pix_fmt=%d: %s", pix_fmt, str);
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    g_free (str);
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  } else {
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    GST_WARNING ("No caps found for pix_fmt=%d", pix_fmt);
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  }

  return caps;
}

/* Convert a FFMPEG Sample Format and optional AVCodecContext
 * to a GstCaps. If the context is ommitted, no fixed values
 * for video/audio size will be included in the GstCaps
 *
 * See below for usefullness
 */

static GstCaps *
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gst_ffmpeg_smpfmt_to_caps (enum SampleFormat sample_fmt,
    AVCodecContext * context)
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{
  GstCaps *caps = NULL;

  int bpp = 0;
  gboolean signedness = FALSE;

  switch (sample_fmt) {
    case SAMPLE_FMT_S16:
      signedness = TRUE;
      bpp = 16;
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      break;
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    default:
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      /* .. */
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      break;
  }

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  if (bpp) {
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    caps = GST_FF_AUD_CAPS_NEW ("audio/x-raw-int",
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        "signed", G_TYPE_BOOLEAN, signedness,
        "endianness", G_TYPE_INT, G_BYTE_ORDER,
        "width", G_TYPE_INT, bpp, "depth", G_TYPE_INT, bpp, NULL);
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  }

  if (caps != NULL) {
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    char *str = gst_caps_to_string (caps);
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    GST_DEBUG ("caps for sample_fmt=%d: %s", sample_fmt, str);
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    g_free (str);
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  } else {
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    GST_WARNING ("No caps found for sample_fmt=%d", sample_fmt);
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  }

  return caps;
}

/* Convert a FFMPEG codec Type and optional AVCodecContext
 * to a GstCaps. If the context is ommitted, no fixed values
 * for video/audio size will be included in the GstCaps
 *
 * CodecType is primarily meant for uncompressed data GstCaps!
 */

GstCaps *
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gst_ffmpeg_codectype_to_caps (enum CodecType codec_type,
    AVCodecContext * context)
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{
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  GstCaps *caps;
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  switch (codec_type) {
    case CODEC_TYPE_VIDEO:
      if (context) {
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        caps = gst_ffmpeg_pixfmt_to_caps (context->pix_fmt,
            context->width == -1 ? NULL : context);
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      } else {
        GstCaps *temp;
        enum PixelFormat i;

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        caps = gst_caps_new_empty ();
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        for (i = 0; i < PIX_FMT_NB; i++) {
          temp = gst_ffmpeg_pixfmt_to_caps (i, NULL);
          if (temp != NULL) {
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            gst_caps_append (caps, temp);
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          }
        }
      }
      break;

    case CODEC_TYPE_AUDIO:
      if (context) {
        caps = gst_ffmpeg_smpfmt_to_caps (context->sample_fmt, context);
      } else {
        GstCaps *temp;
        enum SampleFormat i;

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        caps = gst_caps_new_empty ();
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        for (i = 0; i <= SAMPLE_FMT_S16; i++) {
          temp = gst_ffmpeg_smpfmt_to_caps (i, NULL);
          if (temp != NULL) {
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            gst_caps_append (caps, temp);
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          }
        }
      }
      break;

    default:
      /* .. */
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