예제 #1
0
void get_wav_header(ByteIOContext *pb, AVCodecContext *codec, int size)
{
    int id;

    id = get_le16(pb);
    codec->codec_type = CODEC_TYPE_AUDIO;
    codec->codec_tag = id;
    codec->channels = get_le16(pb);
    codec->sample_rate = get_le32(pb);
    codec->bit_rate = get_le32(pb) * 8;
    codec->block_align = get_le16(pb);
    if (size == 14) {  /* We're dealing with plain vanilla WAVEFORMAT */
        codec->bits_per_sample = 8;
    }else
        codec->bits_per_sample = get_le16(pb);
    codec->codec_id = wav_codec_get_id(id, codec->bits_per_sample);

    if (size > 16) {  /* We're obviously dealing with WAVEFORMATEX */
        codec->extradata_size = get_le16(pb);
        if (codec->extradata_size > 0) {
            if (codec->extradata_size > size - 18)
                codec->extradata_size = size - 18;
            codec->extradata = malloc(codec->extradata_size);
            get_buffer(pb, codec->extradata, codec->extradata_size);
        } else
            codec->extradata_size = 0;

        /* It is possible for the chunk to contain garbage at the end */
        if (size - codec->extradata_size - 18 > 0)
            url_fskip(pb, size - codec->extradata_size - 18);
    }
}
예제 #2
0
파일: nuv.c 프로젝트: bwahn/ffmpeg
/**
 * \brief read until we found all data needed for decoding
 * \param vst video stream of which to change parameters
 * \param ast video stream of which to change parameters
 * \param myth set if this is a MythTVVideo format file
 * \return 1 if all required codec data was found
 */
static int get_codec_data(ByteIOContext *pb, AVStream *vst,
                          AVStream *ast, int myth) {
    nuv_frametype frametype;
    if (!vst && !myth)
        return 1; // no codec data needed
    while (!url_feof(pb)) {
        int size, subtype;
        frametype = get_byte(pb);
        switch (frametype) {
            case NUV_EXTRADATA:
                subtype = get_byte(pb);
                url_fskip(pb, 6);
                size = PKTSIZE(get_le32(pb));
                if (vst && subtype == 'R') {
                    vst->codec->extradata_size = size;
                    vst->codec->extradata = av_malloc(size);
                    get_buffer(pb, vst->codec->extradata, size);
                    size = 0;
                    if (!myth)
                        return 1;
                }
                break;
            case NUV_MYTHEXT:
                url_fskip(pb, 7);
                size = PKTSIZE(get_le32(pb));
                if (size != 128 * 4)
                    break;
                get_le32(pb); // version
                if (vst) {
                    vst->codec->codec_tag = get_le32(pb);
                    vst->codec->codec_id =
                        codec_get_id(codec_bmp_tags, vst->codec->codec_tag);
                    if (vst->codec->codec_tag == MKTAG('R', 'J', 'P', 'G'))
                        vst->codec->codec_id = CODEC_ID_NUV;
                } else
                    url_fskip(pb, 4);

                if (ast) {
                    ast->codec->codec_tag = get_le32(pb);
                    ast->codec->sample_rate = get_le32(pb);
                    ast->codec->bits_per_coded_sample = get_le32(pb);
                    ast->codec->channels = get_le32(pb);
                    ast->codec->codec_id =
                        wav_codec_get_id(ast->codec->codec_tag,
                                         ast->codec->bits_per_coded_sample);
                    ast->need_parsing = AVSTREAM_PARSE_FULL;
                } else
                    url_fskip(pb, 4 * 4);

                size -= 6 * 4;
                url_fskip(pb, size);
                return 1;
            case NUV_SEEKP:
                size = 11;
                break;
            default:
                url_fskip(pb, 7);
                size = PKTSIZE(get_le32(pb));
                break;
        }
        url_fskip(pb, size);
    }
    return 0;
}
예제 #3
0
static int avisynth_read_header(AVFormatContext *s, AVFormatParameters *ap)
{
  AVISynthContext *avs = s->priv_data;
  HRESULT res;
  AVIFILEINFO info;
  DWORD id;
  AVStream *st;
  AVISynthStream *stream;

  AVIFileInit();

  res = AVIFileOpen(&avs->file, s->filename, OF_READ|OF_SHARE_DENY_WRITE, NULL);
  if (res != S_OK)
    {
      av_log(s, AV_LOG_ERROR, "AVIFileOpen failed with error %ld", res);
      AVIFileExit();
      return -1;
    }

  res = AVIFileInfo(avs->file, &info, sizeof(info));
  if (res != S_OK)
    {
      av_log(s, AV_LOG_ERROR, "AVIFileInfo failed with error %ld", res);
      AVIFileExit();
      return -1;
    }

  avs->streams = av_mallocz(info.dwStreams * sizeof(AVISynthStream));

  for (id=0; id<info.dwStreams; id++)
    {
      stream = &avs->streams[id];
      stream->read = 0;
      if (AVIFileGetStream(avs->file, &stream->handle, 0, id) == S_OK)
        {
          if (AVIStreamInfo(stream->handle, &stream->info, sizeof(stream->info)) == S_OK)
            {
              if (stream->info.fccType == streamtypeAUDIO)
                {
                  WAVEFORMATEX wvfmt;
                  LONG struct_size = sizeof(WAVEFORMATEX);
                  if (AVIStreamReadFormat(stream->handle, 0, &wvfmt, &struct_size) != S_OK)
                    continue;

                  st = av_new_stream(s, id);
                  st->codec->codec_type = CODEC_TYPE_AUDIO;

                  st->codec->block_align = wvfmt.nBlockAlign;
                  st->codec->channels = wvfmt.nChannels;
                  st->codec->sample_rate = wvfmt.nSamplesPerSec;
                  st->codec->bit_rate = wvfmt.nAvgBytesPerSec * 8;
                  st->codec->bits_per_sample = wvfmt.wBitsPerSample;

                  stream->chunck_samples = wvfmt.nSamplesPerSec * (uint64_t)info.dwScale / (uint64_t)info.dwRate;
                  stream->chunck_size = stream->chunck_samples * wvfmt.nChannels * wvfmt.wBitsPerSample / 8;

                  st->codec->codec_tag = wvfmt.wFormatTag;
                  st->codec->codec_id = wav_codec_get_id(wvfmt.wFormatTag, st->codec->bits_per_sample);
                }
              else if (stream->info.fccType == streamtypeVIDEO)
                {
                  BITMAPINFO imgfmt;
                  LONG struct_size = sizeof(BITMAPINFO);

                  stream->chunck_size = stream->info.dwSampleSize;
                  stream->chunck_samples = 1;

                  if (AVIStreamReadFormat(stream->handle, 0, &imgfmt, &struct_size) != S_OK)
                    continue;

                  st = av_new_stream(s, id);
                  st->codec->codec_type = CODEC_TYPE_VIDEO;
                  st->r_frame_rate.num = stream->info.dwRate;
                  st->r_frame_rate.den = stream->info.dwScale;

                  st->codec->width = imgfmt.bmiHeader.biWidth;
                  st->codec->height = imgfmt.bmiHeader.biHeight;

                  st->codec->bits_per_sample = imgfmt.bmiHeader.biBitCount;
                  st->codec->bit_rate = (uint64_t)stream->info.dwSampleSize * (uint64_t)stream->info.dwRate * 8 / (uint64_t)stream->info.dwScale;
                  st->codec->codec_tag = imgfmt.bmiHeader.biCompression;
                  st->codec->codec_id = codec_get_id(codec_bmp_tags, imgfmt.bmiHeader.biCompression);

                  st->duration = stream->info.dwLength;
                }
              else
                {
                  AVIStreamRelease(stream->handle);
                  continue;
                }

              avs->nb_streams++;

              st->codec->stream_codec_tag = stream->info.fccHandler;

              av_set_pts_info(st, 64, info.dwScale, info.dwRate);
              st->start_time = stream->info.dwStart;
            }
        }
    }

  return 0;
}