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IFF stereo support 

Patch by Jai Menon ( realityman gmx net )

Originally committed as revision 13097 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Jai Menon 2008-05-09 11:25:27 +00:00 committed by Robert Swain
parent c38e75fc52
commit 86b2d47fc0
1 changed files with 27 additions and 1 deletions
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28
libavformat/iff.c
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@ -60,6 +60,19 @@ typedef struct {
uint32_t audio_frame_count;
} IffDemuxContext;
static void interleave_stereo(const uint8_t *src, uint8_t *dest, int size)
{
uint8_t *end = dest + size;
size = size>>1;
while(dest < end) {
*dest++ = *src;
*dest++ = *(src+size);
src++;
}
}
static int iff_probe(AVProbeData *p)
{
const uint8_t *d = p->buf;
@ -152,7 +165,20 @@ static int iff_read_packet(AVFormatContext *s,
if(iff->sent_bytes > iff->body_size)
return AVERROR(EIO);
ret = av_get_packet(pb, pkt, PACKET_SIZE);
if(s->streams[0]->codec->channels == 2) {
uint8_t sample_buffer[PACKET_SIZE];
ret = get_buffer(pb, sample_buffer, PACKET_SIZE);
if(av_new_packet(pkt, PACKET_SIZE) < 0) {
av_log(s, AV_LOG_ERROR, "iff: cannot allocate packet \n");
return AVERROR(ENOMEM);
}
interleave_stereo(sample_buffer, pkt->data, PACKET_SIZE);
}
else {
ret = av_get_packet(pb, pkt, PACKET_SIZE);
}
if(iff->sent_bytes == 0)
pkt->flags |= PKT_FLAG_KEY;