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wvenc: multichannel muxing 

Signed-off-by: Paul B Mahol <onemda@gmail.com>
This commit is contained in:
Paul B Mahol 2012-11-24 10:20:46 +00:00
parent 1b9467aea1
commit 1a61c7a54b
1 changed files with 50 additions and 6 deletions
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56
libavformat/wvenc.c
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@ -19,19 +19,21 @@
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "libavutil/intreadwrite.h"
#include "avformat.h"
#include "internal.h"
#include "avio_internal.h"
#include "apetag.h"
#define WV_EXTRA_SIZE 12
#define WV_END_BLOCK 0x1000
typedef struct{
uint32_t duration;
int off;
} WVMuxContext;
static int write_header(AVFormatContext *s)
{
WVMuxContext *wc = s->priv_data;
AVCodecContext *codec = s->streams[0]->codec;
if (s->nb_streams > 1) {
@ -46,7 +48,6 @@ static int write_header(AVFormatContext *s)
av_log_missing_feature(s, "remuxing from matroska container", 0);
return AVERROR_PATCHWELCOME;
}
wc->off = codec->channels > 2 ? 4 : 0;
avpriv_set_pts_info(s->streams[0], 64, 1, codec->sample_rate);
return 0;
@ -55,18 +56,61 @@ static int write_header(AVFormatContext *s)
static int write_packet(AVFormatContext *s, AVPacket *pkt)
{
WVMuxContext *wc = s->priv_data;
AVCodecContext *codec = s->streams[0]->codec;
AVIOContext *pb = s->pb;
uint64_t size;
uint32_t flags;
uint32_t left = pkt->size;
uint8_t *ptr = pkt->data;
int off = codec->channels > 2 ? 4 : 0;
/* FIXME: Simplify decoder/demuxer so bellow code can support midstream
* change of stream parameters */
wc->duration += pkt->duration;
ffio_wfourcc(pb, "wvpk");
avio_wl32(pb, pkt->size + 12 + wc->off);
if (off) {
size = AV_RL32(pkt->data);
if (size <= 12)
return AVERROR_INVALIDDATA;
size -= 12;
} else {
size = pkt->size;
}
if (size + off > left)
return AVERROR_INVALIDDATA;
avio_wl32(pb, size + 12);
avio_wl16(pb, 0x410);
avio_w8(pb, 0);
avio_w8(pb, 0);
avio_wl32(pb, -1);
avio_wl32(pb, pkt->pts);
avio_write(s->pb, pkt->data, pkt->size);
avio_flush(s->pb);
ptr += off; left -= off;
flags = AV_RL32(ptr + 4);
avio_write(pb, ptr, size);
ptr += size; left -= size;
while (!(flags & WV_END_BLOCK) &&
(left >= 4 + WV_EXTRA_SIZE)) {
ffio_wfourcc(pb, "wvpk");
size = AV_RL32(ptr);
ptr += 4; left -= 4;
if (size < 24 || size - 24 > left)
return AVERROR_INVALIDDATA;
avio_wl32(pb, size);
avio_wl16(pb, 0x410);
avio_w8(pb, 0);
avio_w8(pb, 0);
avio_wl32(pb, -1);
avio_wl32(pb, pkt->pts);
flags = AV_RL32(ptr + 4);
avio_write(pb, ptr, WV_EXTRA_SIZE);
ptr += WV_EXTRA_SIZE; left -= WV_EXTRA_SIZE;
avio_write(pb, ptr, size - 24);
ptr += size - 24; left -= size - 24;
}
avio_flush(pb);
return 0;
}