{
int ret;
TwinContext *tctx = avctx->priv_data;
- int isampf = avctx->sample_rate/1000;
- int ibps = avctx->bit_rate/(1000 * avctx->channels);
+ int isampf, ibps;
tctx->avctx = avctx;
avctx->sample_fmt = AV_SAMPLE_FMT_FLT;
+ if (!avctx->extradata || avctx->extradata_size < 12) {
+ av_log(avctx, AV_LOG_ERROR, "Missing or incomplete extradata\n");
+ return AVERROR_INVALIDDATA;
+ }
+ avctx->channels = AV_RB32(avctx->extradata ) + 1;
+ avctx->bit_rate = AV_RB32(avctx->extradata + 4) * 1000;
+ isampf = AV_RB32(avctx->extradata + 8);
+ switch (isampf) {
+ case 44: avctx->sample_rate = 44100; break;
+ case 22: avctx->sample_rate = 22050; break;
+ case 11: avctx->sample_rate = 11025; break;
+ default: avctx->sample_rate = isampf * 1000; break;
+ }
+
if (avctx->channels > CHANNELS_MAX) {
av_log(avctx, AV_LOG_ERROR, "Unsupported number of channels: %i\n",
avctx->channels);
return -1;
}
+ ibps = avctx->bit_rate / (1000 * avctx->channels);
switch ((isampf << 8) + ibps) {
case (8 <<8) + 8: tctx->mtab = &mode_08_08; break;
int header_size;
int read_bitrate = 0;
int size;
+ uint8_t comm_chunk[12];
if (!st)
return AVERROR(ENOMEM);
switch(chunk_tag){
case MKTAG('C','O','M','M'):
- st->codec->channels = avio_rb32(s->pb) + 1;
- read_bitrate = avio_rb32(s->pb);
- rate_flag = avio_rb32(s->pb);
+ avio_read(s->pb, comm_chunk, 12);
+ st->codec->channels = AV_RB32(comm_chunk ) + 1;
+ read_bitrate = AV_RB32(comm_chunk + 4);
+ rate_flag = AV_RB32(comm_chunk + 8);
avio_skip(s->pb, len-12);
st->codec->bit_rate = read_bitrate*1000;
c->frame_bit_len = st->codec->bit_rate*size/st->codec->sample_rate;
av_set_pts_info(st, 64, 1, st->codec->sample_rate);
+ /* put first 12 bytes of COMM chunk in extradata */
+ if (!(st->codec->extradata = av_malloc(12 + FF_INPUT_BUFFER_PADDING_SIZE)))
+ return AVERROR(ENOMEM);
+ st->codec->extradata_size = 12;
+ memcpy(st->codec->extradata, comm_chunk, 12);
+
return 0;
}