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rtp: h264: Move FU-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 f0a8747996
commit 3b33dfb23c
1 changed files with 39 additions and 39 deletions
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78
libavformat/rtpdec_h264.c
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@ -240,6 +240,44 @@ static int h264_handle_packet_stap_a(AVFormatContext *ctx, AVPacket *pkt,
return 0;
}
static int h264_handle_packet_fu_a(AVFormatContext *ctx, AVPacket *pkt,
const uint8_t *buf, int len)
{
uint8_t fu_indicator, fu_header, start_bit, nal_type, nal;
int ret;
if (len < 3) {
av_log(ctx, AV_LOG_ERROR, "Too short data for FU-A H264 RTP packet\n");
return AVERROR_INVALIDDATA;
}
fu_indicator = buf[0];
fu_header = buf[1];
start_bit = fu_header >> 7;
nal_type = fu_header & 0x1f;
nal = fu_indicator & 0xe0 | nal_type;
// skip the fu_indicator and fu_header
buf += 2;
len -= 2;
if (start_bit) {
COUNT_NAL_TYPE(data, nal_type);
/* copy in the start sequence, and the reconstructed nal */
if ((ret = av_new_packet(pkt, sizeof(start_sequence) + sizeof(nal) + len)) < 0)
return ret;
memcpy(pkt->data, start_sequence, sizeof(start_sequence));
pkt->data[sizeof(start_sequence)] = nal;
memcpy(pkt->data + sizeof(start_sequence) + sizeof(nal), buf, len);
} else {
if ((ret = av_new_packet(pkt, len)) < 0)
return ret;
memcpy(pkt->data, buf, len);
}
return 0;
}
// return 0 on packet, no more left, 1 on packet, 1 on partial packet
static int h264_handle_packet(AVFormatContext *ctx, PayloadContext *data,
AVStream *st, AVPacket *pkt, uint32_t *timestamp,
@ -293,45 +331,7 @@ static int h264_handle_packet(AVFormatContext *ctx, PayloadContext *data,
break;
case 28: // FU-A (fragmented nal)
buf++;
len--; // skip the fu_indicator
if (len > 1) {
// these are the same as above, we just redo them here for clarity
uint8_t fu_indicator = nal;
uint8_t fu_header = *buf;
uint8_t start_bit = fu_header >> 7;
uint8_t av_unused end_bit = (fu_header & 0x40) >> 6;
uint8_t nal_type = fu_header & 0x1f;
uint8_t reconstructed_nal;
// Reconstruct this packet's true nal; only the data follows.
/* The original nal forbidden bit and NRI are stored in this
* packet's nal. */
reconstructed_nal = fu_indicator & 0xe0;
reconstructed_nal |= nal_type;
// skip the fu_header
buf++;
len--;
if (start_bit)
COUNT_NAL_TYPE(data, nal_type);
if (start_bit) {
/* copy in the start sequence, and the reconstructed nal */
if ((result = av_new_packet(pkt, sizeof(start_sequence) + sizeof(nal) + len)) < 0)
return result;
memcpy(pkt->data, start_sequence, sizeof(start_sequence));
pkt->data[sizeof(start_sequence)] = reconstructed_nal;
memcpy(pkt->data + sizeof(start_sequence) + sizeof(nal), buf, len);
} else {
if ((result = av_new_packet(pkt, len)) < 0)
return result;
memcpy(pkt->data, buf, len);
}
} else {
av_log(ctx, AV_LOG_ERROR, "Too short data for FU-A H264 RTP packet\n");
result = AVERROR_INVALIDDATA;
}
result = h264_handle_packet_fu_a(ctx, pkt, buf, len);
break;
case 30: // undefined