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avc: Add a function for converting mp4 style extradata to annex b 

Make movenc use this function instead of the current custom
conversion function.

Signed-off-by: Martin Storsjö <martin@martin.st>
This commit is contained in:
Martin Storsjö 2012-03-22 13:25:58 +02:00
parent 2ee01fbded
commit d5ed5e7d0c
3 changed files with 42 additions and 24 deletions
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31
libavformat/avc.c
View File

@ -160,3 +160,34 @@ int ff_isom_write_avcc(AVIOContext *pb, const uint8_t *data, int len)
}
return 0;
}
int ff_avc_write_annexb_extradata(const uint8_t *in, uint8_t **buf, int *size)
{
uint16_t sps_size, pps_size;
uint8_t *out;
int out_size;
*buf = NULL;
if (*size >= 4 && (AV_RB32(in) == 0x00000001 || AV_RB24(in) == 0x000001))
return 0;
if (*size < 11 || in[0] != 1)
return AVERROR_INVALIDDATA;
sps_size = AV_RB16(&in[6]);
if (11 + sps_size > *size)
return AVERROR_INVALIDDATA;
pps_size = AV_RB16(&in[9 + sps_size]);
if (11 + sps_size + pps_size > *size)
return AVERROR_INVALIDDATA;
out_size = 8 + sps_size + pps_size;
out = av_mallocz(out_size);
if (!out)
return AVERROR(ENOMEM);
AV_WB32(&out[0], 0x00000001);
memcpy(out + 4, &in[8], sps_size);
AV_WB32(&out[4 + sps_size], 0x00000001);
memcpy(out + 8 + sps_size, &in[11 + sps_size], pps_size);
*buf = out;
*size = out_size;
return 0;
}

1
libavformat/avc.h
View File

@ -29,5 +29,6 @@ int ff_avc_parse_nal_units(AVIOContext *s, const uint8_t *buf, int size);
int ff_avc_parse_nal_units_buf(const uint8_t *buf_in, uint8_t **buf, int *size);
int ff_isom_write_avcc(AVIOContext *pb, const uint8_t *data, int len);
const uint8_t *ff_avc_find_startcode(const uint8_t *p, const uint8_t *end);
int ff_avc_write_annexb_extradata(const uint8_t *in, uint8_t **buf, int *size);
#endif /* AVFORMAT_AVC_H */

34
libavformat/movenc.c
View File

@ -2096,26 +2096,6 @@ static void param_write_hex(AVIOContext *pb, const char *name, const uint8_t *va
avio_printf(pb, "<param name=\"%s\" value=\"%s\" valuetype=\"data\"/>\n", name, buf);
}
static void write_h264_extradata(AVIOContext *pb, AVCodecContext *enc)
{
uint16_t sps_size, pps_size, len;
char buf[150];
sps_size = AV_RB16(&enc->extradata[6]);
if (11 + sps_size > enc->extradata_size)
return;
pps_size = AV_RB16(&enc->extradata[9 + sps_size]);
if (11 + sps_size + pps_size > enc->extradata_size)
return;
len = FFMIN(sizeof(buf)/2 - 1, sps_size);
ff_data_to_hex(buf, &enc->extradata[8], len, 0);
buf[2*len] = '\0';
avio_printf(pb, "<param name=\"CodecPrivateData\" value=\"00000001%s", buf);
len = FFMIN(sizeof(buf)/2 - 1, pps_size);
ff_data_to_hex(buf, &enc->extradata[11 + sps_size], len, 0);
buf[2*len] = '\0';
avio_printf(pb, "00000001%s\" valuetype=\"data\"/>\n", buf);
}
static int mov_write_isml_manifest(AVIOContext *pb, MOVMuxContext *mov)
{
int64_t pos = avio_tell(pb);
@ -2157,10 +2137,16 @@ static int mov_write_isml_manifest(AVIOContext *pb, MOVMuxContext *mov)
param_write_int(pb, "systemBitrate", track->enc->bit_rate);
param_write_int(pb, "trackID", track_id);
if (track->enc->codec_type == AVMEDIA_TYPE_VIDEO) {
if (track->enc->codec_id == CODEC_ID_H264 &&
track->enc->extradata_size >= 11 &&
track->enc->extradata[0] == 1) {
write_h264_extradata(pb, track->enc);
if (track->enc->codec_id == CODEC_ID_H264) {
uint8_t *ptr;
int size = track->enc->extradata_size;
if (!ff_avc_write_annexb_extradata(track->enc->extradata, &ptr,
&size)) {
param_write_hex(pb, "CodecPrivateData",
ptr ? ptr : track->enc->extradata,
size);
av_free(ptr);
}
} else {
param_write_hex(pb, "CodecPrivateData", track->enc->extradata,
track->enc->extradata_size);