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Code Issues Releases Activity

rtp: h264: Move STAP-A NAL parsing to a function

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This commit is contained in:
Luca Barbato 2015-02-13 23:38:14 +01:00
parent a9a0b8d6c1
commit f0a8747996
1 changed files with 61 additions and 54 deletions
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115
libavformat/rtpdec_h264.c
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@ -180,6 +180,66 @@ static int sdp_parse_fmtp_config_h264(AVFormatContext *s,
return 0; return 0;
} }
static int h264_handle_packet_stap_a(AVFormatContext *ctx, AVPacket *pkt,
const uint8_t *buf, int len)
{
int pass = 0;
int total_length = 0;
uint8_t *dst = NULL;
int ret;
for (pass = 0; pass < 2; pass++) {
const uint8_t *src = buf;
int src_len = len;
while (src_len > 2) {
uint16_t nal_size = AV_RB16(src);
// consume the length of the aggregate
src += 2;
src_len -= 2;
if (nal_size <= src_len) {
if (pass == 0) {
// counting
total_length += sizeof(start_sequence) + nal_size;
} else {
// copying
assert(dst);
memcpy(dst, start_sequence, sizeof(start_sequence));
dst += sizeof(start_sequence);
memcpy(dst, src, nal_size);
COUNT_NAL_TYPE(data, *src);
dst += nal_size;
}
} else {
av_log(ctx, AV_LOG_ERROR,
"nal size exceeds length: %d %d\n", nal_size, src_len);
}
// eat what we handled
src += nal_size;
src_len -= nal_size;
if (src_len < 0)
av_log(ctx, AV_LOG_ERROR,
"Consumed more bytes than we got! (%d)\n", src_len);
}
if (pass == 0) {
/* now we know the total size of the packet (with the
* start sequences added) */
if ((ret = av_new_packet(pkt, total_length)) < 0)
return ret;
dst = pkt->data;
} else {
assert(dst - pkt->data == total_length);
}
}
return 0;
}
// return 0 on packet, no more left, 1 on packet, 1 on partial packet // return 0 on packet, no more left, 1 on packet, 1 on partial packet
static int h264_handle_packet(AVFormatContext *ctx, PayloadContext *data, static int h264_handle_packet(AVFormatContext *ctx, PayloadContext *data,
AVStream *st, AVPacket *pkt, uint32_t *timestamp, AVStream *st, AVPacket *pkt, uint32_t *timestamp,
@ -219,60 +279,7 @@ static int h264_handle_packet(AVFormatContext *ctx, PayloadContext *data,
buf++; buf++;
len--; len--;
// first we are going to figure out the total size // first we are going to figure out the total size
{ result = h264_handle_packet_stap_a(ctx, pkt, buf, len);
int pass = 0;
int total_length = 0;
uint8_t *dst = NULL;
for (pass = 0; pass < 2; pass++) {
const uint8_t *src = buf;
int src_len = len;
while (src_len > 2) {
uint16_t nal_size = AV_RB16(src);
// consume the length of the aggregate
src += 2;
src_len -= 2;
if (nal_size <= src_len) {
if (pass == 0) {
// counting
total_length += sizeof(start_sequence) + nal_size;
} else {
// copying
assert(dst);
memcpy(dst, start_sequence, sizeof(start_sequence));
dst += sizeof(start_sequence);
memcpy(dst, src, nal_size);
COUNT_NAL_TYPE(data, *src);
dst += nal_size;
}
} else {
av_log(ctx, AV_LOG_ERROR,
"nal size exceeds length: %d %d\n", nal_size, src_len);
}
// eat what we handled
src += nal_size;
src_len -= nal_size;
if (src_len < 0)
av_log(ctx, AV_LOG_ERROR,
"Consumed more bytes than we got! (%d)\n", src_len);
}
if (pass == 0) {
/* now we know the total size of the packet (with the
* start sequences added) */
if ((result = av_new_packet(pkt, total_length)) < 0)
return result;
dst = pkt->data;
} else {
assert(dst - pkt->data == total_length);
}
}
}
break; break;
case 25: // STAP-B case 25: // STAP-B