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sdp: Provide out of bound parameter sets for HEVC if extradata is set

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Signed-off-by: Martin Storsjö <martin@martin.st>
This commit is contained in:
Martin Storsjö 2014-10-03 23:25:37 +03:00
parent 9b7f932ee5
commit e5cfc8fdad
1 changed files with 106 additions and 2 deletions
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108
libavformat/sdp.c
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@ -29,6 +29,7 @@
#include "avformat.h"
#include "internal.h"
#include "avc.h"
#include "hevc.h"
#include "rtp.h"
#if CONFIG_NETWORK
#include "network.h"
@ -222,6 +223,107 @@ static char *extradata2psets(AVCodecContext *c)
return psets;
}
static char *extradata2psets_hevc(AVCodecContext *c)
{
char *psets;
uint8_t *extradata = c->extradata;
int extradata_size = c->extradata_size;
uint8_t *tmpbuf = NULL;
int ps_pos[3] = { 0 };
static const char * const ps_names[3] = { "vps", "sps", "pps" };
int num_arrays, num_nalus;
int pos, i, j;
// Convert to hvcc format. Since we need to group multiple NALUs of
// the same type, and we might need to convert from one format to the
// other anyway, we get away with a little less work by using the hvcc
// format.
if (c->extradata[0] != 1) {
AVIOContext *pb;
if (avio_open_dyn_buf(&pb) < 0)
return NULL;
if (ff_isom_write_hvcc(pb, c->extradata, c->extradata_size, 0) < 0) {
avio_close_dyn_buf(pb, &tmpbuf);
goto err;
}
extradata_size = avio_close_dyn_buf(pb, &extradata);
tmpbuf = extradata;
}
if (extradata_size < 23)
goto err;
num_arrays = extradata[22];
pos = 23;
for (i = 0; i < num_arrays; i++) {
int num_nalus, nalu_type;
if (pos + 3 > extradata_size)
goto err;
nalu_type = extradata[pos] & 0x3f;
// Not including libavcodec/hevc.h to avoid confusion between
// NAL_* with the same name for both H264 and HEVC.
if (nalu_type == 32) // VPS
ps_pos[0] = pos;
else if (nalu_type == 33) // SPS
ps_pos[1] = pos;
else if (nalu_type == 34) // PPS
ps_pos[2] = pos;
num_nalus = AV_RB16(&extradata[pos + 1]);
pos += 3;
for (j = 0; j < num_nalus; j++) {
int len;
if (pos + 2 > extradata_size)
goto err;
len = AV_RB16(&extradata[pos]);
pos += 2;
if (pos + len > extradata_size)
goto err;
pos += len;
}
}
if (!ps_pos[0] || !ps_pos[1] || !ps_pos[2])
goto err;
psets = av_mallocz(MAX_PSET_SIZE);
if (!psets)
goto err;
psets[0] = '\0';
for (i = 0; i < 3; i++) {
pos = ps_pos[i];
if (i > 0)
av_strlcat(psets, "; ", MAX_PSET_SIZE);
av_strlcatf(psets, MAX_PSET_SIZE, "sprop-%s=", ps_names[i]);
// Skipping boundary checks in the input here; we've already traversed
// the whole hvcc structure above without issues
num_nalus = AV_RB16(&extradata[pos + 1]);
pos += 3;
for (j = 0; j < num_nalus; j++) {
int len = AV_RB16(&extradata[pos]);
int strpos;
pos += 2;
if (j > 0)
av_strlcat(psets, ",", MAX_PSET_SIZE);
strpos = strlen(psets);
if (!av_base64_encode(psets + strpos, MAX_PSET_SIZE - strpos,
&extradata[pos], len)) {
av_free(psets);
goto err;
}
pos += len;
}
}
av_free(tmpbuf);
return psets;
err:
av_free(tmpbuf);
return NULL;
}
static char *extradata2config(AVCodecContext *c)
{
char *config;
@ -412,9 +514,11 @@ static char *sdp_write_media_attributes(char *buff, int size, AVCodecContext *c,
break;
case AV_CODEC_ID_HEVC:
if (c->extradata_size)
av_log(NULL, AV_LOG_WARNING, "HEVC extradata not currently "
"passed properly through SDP\n");
config = extradata2psets_hevc(c);
av_strlcatf(buff, size, "a=rtpmap:%d H265/90000\r\n", payload_type);
if (config)
av_strlcatf(buff, size, "a=fmtp:%d %s\r\n",
payload_type, config);
break;
case AV_CODEC_ID_MPEG4:
if (c->extradata_size) {