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avformat/matroskadec: factor the prores packet parsing code out 

Simplifies code in matroska_parse_frame(). This is in preparation for
the following patch.

Reviewed-by: Michael Niedermayer <michael@niedermayer.cc>
Signed-off-by: James Almer <jamrial@gmail.com>
This commit is contained in:
James Almer 2018-04-04 16:07:36 -03:00
parent a61886650b
commit b8e75a2a08
1 changed files with 38 additions and 12 deletions
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50
libavformat/matroskadec.c
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@ -3035,6 +3035,29 @@ fail:
return ret;
}
static int matroska_parse_prores(MatroskaTrack *track, uint8_t *src,
uint8_t **pdst, int *size)
{
uint8_t *dst = src;
int dstlen = *size;
if (AV_RB32(&src[4]) != MKBETAG('i', 'c', 'p', 'f')) {
dst = av_malloc(dstlen + 8);
if (!dst)
return AVERROR(ENOMEM);
AV_WB32(dst, dstlen);
AV_WB32(dst + 4, MKBETAG('i', 'c', 'p', 'f'));
memcpy(dst + 8, src, dstlen);
dstlen += 8;
}
*pdst = dst;
*size = dstlen;
return 0;
}
static int matroska_parse_webvtt(MatroskaDemuxContext *matroska,
MatroskaTrack *track,
AVStream *st,
@ -3160,7 +3183,7 @@ static int matroska_parse_frame(MatroskaDemuxContext *matroska,
{
MatroskaTrackEncoding *encodings = track->encodings.elem;
uint8_t *pkt_data = data;
int offset = 0, res;
int res;
AVPacket pktl, *pkt = &pktl;
if (encodings && !encodings->type && encodings->scope & 1) {
@ -3182,23 +3205,26 @@ static int matroska_parse_frame(MatroskaDemuxContext *matroska,
pkt_data = wv_data;
}
if (st->codecpar->codec_id == AV_CODEC_ID_PRORES &&
AV_RB32(&data[4]) != MKBETAG('i', 'c', 'p', 'f'))
offset = 8;
if (st->codecpar->codec_id == AV_CODEC_ID_PRORES) {
uint8_t *pr_data;
res = matroska_parse_prores(track, pkt_data, &pr_data, &pkt_size);
if (res < 0) {
av_log(matroska->ctx, AV_LOG_ERROR,
"Error parsing a prores block.\n");
goto fail;
}
if (pkt_data != data)
av_freep(&pkt_data);
pkt_data = pr_data;
}
/* XXX: prevent data copy... */
if (av_new_packet(pkt, pkt_size + offset) < 0) {
if (av_new_packet(pkt, pkt_size) < 0) {
res = AVERROR(ENOMEM);
goto fail;
}
if (st->codecpar->codec_id == AV_CODEC_ID_PRORES && offset == 8) {
uint8_t *buf = pkt->data;
bytestream_put_be32(&buf, pkt_size);
bytestream_put_be32(&buf, MKBETAG('i', 'c', 'p', 'f'));
}
memcpy(pkt->data + offset, pkt_data, pkt_size);
memcpy(pkt->data, pkt_data, pkt_size);
if (pkt_data != data)
av_freep(&pkt_data);