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rtpdec_vp9: Support parsing the scalability structure 

We still only support one single layer though, but this allows
receiving streams that have this structure present even for
single layer streams.

Signed-off-by: Martin Storsjö <martin@martin.st>
This commit is contained in:
Martin Storsjö 2016-04-27 14:36:57 +03:00 committed by Thomas Volkert
parent d50b3fe463
commit cab237953e
1 changed files with 58 additions and 2 deletions
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58
libavformat/rtpdec_vp9.c
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@ -222,9 +222,65 @@ static int vp9_handle_packet(AVFormatContext *ctx, PayloadContext *rtp_vp9_ctx,
* X: 1 if this layer index has an extended relative Picture ID.
*/
if (has_ss_data) {
avpriv_report_missing_feature(ctx, "VP9 scalability structure data");
int n_s, y, g, i;
if (len < 1) {
av_log(ctx, AV_LOG_ERROR, "Too short RTP/VP9 packet\n");
return AVERROR_INVALIDDATA;
}
n_s = buf[0] >> 5;
y = !!(buf[0] & 0x10);
g = !!(buf[0] & 0x08);
buf++;
len--;
if (n_s > 0) {
avpriv_report_missing_feature(ctx, "VP9 scalability structure with multiple layers");
return AVERROR_PATCHWELCOME;
}
if (y) {
if (len < 4 * (n_s + 1)) {
av_log(ctx, AV_LOG_ERROR, "Too short RTP/VP9 packet\n");
return AVERROR_INVALIDDATA;
}
for (i = 0; i < n_s + 1; i++) {
av_unused int w, h;
w = AV_RB16(buf);
h = AV_RB16(buf + 2);
buf += 4;
len -= 4;
}
}
if (g) {
int n_g;
if (len < 1) {
av_log(ctx, AV_LOG_ERROR, "Too short RTP/VP9 packet\n");
return AVERROR_INVALIDDATA;
}
n_g = buf[0];
buf++;
len--;
for (i = 0; i < n_g; i++) {
av_unused int t, u, r, j;
if (len < 1) {
av_log(ctx, AV_LOG_ERROR, "Too short RTP/VP9 packet\n");
return AVERROR_INVALIDDATA;
}
t = buf[0] >> 5;
u = !!(buf[0] & 0x10);
r = (buf[0] >> 2) & 0x03;
buf++;
len--;
if (len < r) {
av_log(ctx, AV_LOG_ERROR, "Too short RTP/VP9 packet\n");
return AVERROR_INVALIDDATA;
}
for (j = 0; j < r; j++) {
av_unused int p_diff = buf[0];
buf++;
len--;
}
}
}
}
/*
* decode the VP9 payload header