// 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,
const uint8_t *buf, int len, uint16_t seq,
int flags)
{
uint8_t nal;
uint8_t type;
int result = 0;
if (!len) {
av_log(ctx, AV_LOG_ERROR, "Empty H.264 RTP packet\n");
return AVERROR_INVALIDDATA;
}
nal = buf[0];
type = nal & 0x1f;
/* Simplify the case (these are all the NAL types used internally by
* the H.264 codec). */
if (type >= 1 && type <= 23)
type = 1;
switch (type) {
case 0: // undefined, but pass them through
case 1:
if ((result = av_new_packet(pkt, len + sizeof(start_sequence))) < 0)
return result;
memcpy(pkt->data, start_sequence, sizeof(start_sequence));
memcpy(pkt->data + sizeof(start_sequence), buf, len);
COUNT_NAL_TYPE(data, nal);
break;
case 24: // STAP-A (one packet, multiple nals)
// consume the STAP-A NAL
buf++;
len--;
result = ff_h264_handle_aggregated_packet(ctx, data, pkt, buf, len, 0,
NAL_COUNTERS, NAL_MASK);
break;
case 25: // STAP-B
case 26: // MTAP-16
case 27: // MTAP-24
case 29: // FU-B
avpriv_report_missing_feature(ctx, "RTP H.264 NAL unit type %d", type);
result = AVERROR_PATCHWELCOME;
break;
case 28: // FU-A (fragmented nal)
result = h264_handle_packet_fu_a(ctx, data, pkt, buf, len,
NAL_COUNTERS, NAL_MASK);
break;
case 30: // undefined
case 31: // undefined
default:
av_log(ctx, AV_LOG_ERROR, "Undefined type (%d)\n", type);
result = AVERROR_INVALIDDATA;
break;
}
pkt->stream_index = st->index;
return result;
}
// 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,
const uint8_t *buf, int len, int flags)
{
uint8_t nal;
uint8_t type;
int result = 0;
if (!len) {
av_log(ctx, AV_LOG_ERROR, "Empty H264 RTP packet\n");
return AVERROR_INVALIDDATA;
}
nal = buf[0];
type = nal & 0x1f;
assert(data);
assert(buf);
/* Simplify the case (these are all the nal types used internally by
* the h264 codec). */
if (type >= 1 && type <= 23)
type = 1;
switch (type) {
case 0: // undefined, but pass them through
case 1:
av_new_packet(pkt, len + sizeof(start_sequence));
memcpy(pkt->data, start_sequence, sizeof(start_sequence));
memcpy(pkt->data + sizeof(start_sequence), buf, len);
COUNT_NAL_TYPE(data, nal);
break;
case 24: // STAP-A (one packet, multiple nals)
// consume the STAP-A NAL
buf++;
len--;
// first we are going to figure out the total size
{
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) */
av_new_packet(pkt, total_length);
dst = pkt->data;
} else {
assert(dst - pkt->data == total_length);
}
}
}
break;
case 25: // STAP-B
case 26: // MTAP-16
case 27: // MTAP-24
case 29: // FU-B
av_log(ctx, AV_LOG_ERROR,
"Unhandled type (%d) (See RFC for implementation details\n",
type);
result = AVERROR(ENOSYS);
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 */
av_new_packet(pkt, sizeof(start_sequence) + sizeof(nal) + len);
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 {
av_new_packet(pkt, len);
memcpy(pkt->data, buf, len);
}
} else {
