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h264_mp4toannexb: Try to avoid four byte startcodes

Browse Source 
According to the H.264 specifications, the only NAL units that need to
have four byte startcodes in H.264 Annex B format are SPS/PPS units and
units that start a new access unit. Before af7e953a, the first of these
conditions wasn't upheld as already existing in-band parameter sets
would not automatically be written with a four byte startcode, but only
when they already were at the beginning of their input packets. But it
made four byte startcodes be used too often as every unit that is written
together with a parameter set that is inserted from extradata received a
four byte startcode although a three byte start code would suffice
unless the unit itself were a parameter set.

FATE has been updated to reflect the changes. Although the patch leaves
the extradata unchanged, the size of the extradata according to the FATE
reports changes. This is due to a quirk in ff_h2645_packet_split which
is used by extract_extradata: If the input is Annex B, the first zero of
a four byte startcode is considered a part of the last unit (if any).

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Andreas Rheinhardt 2019-12-14 23:19:20 +01:00 committed by Michael Niedermayer
parent aa486b4b66
commit 518bbe9eac
6 changed files with 27 additions and 27 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
libavcodec/h264_mp4toannexb_bsf.c
View File

@ -47,7 +47,7 @@ static int alloc_and_copy(AVPacket *out,
const uint8_t *in, uint32_t in_size, int ps)
{
uint32_t offset = out->size;
uint8_t start_code_size = offset == 0 || ps ? 4 : 3;
uint8_t start_code_size = offset == 0 && sps_pps_size == 0 || ps ? 4 : 3;
int err;
err = av_grow_packet(out, sps_pps_size + in_size + start_code_size);
@ -244,7 +244,7 @@ static int h264_mp4toannexb_filter(AVBSFContext *ctx, AVPacket *out)
if (s->new_idr && unit_type == H264_NAL_IDR_SLICE && !s->idr_sps_seen && !s->idr_pps_seen) {
if ((ret=alloc_and_copy(out,
ctx->par_out->extradata, ctx->par_out->extradata_size,
buf, nal_size, 1)) < 0)
buf, nal_size, 0)) < 0)
goto fail;
s->new_idr = 0;
/* if only SPS has been seen, also insert PPS */
@ -255,7 +255,7 @@ static int h264_mp4toannexb_filter(AVBSFContext *ctx, AVPacket *out)
goto fail;
} else if ((ret = alloc_and_copy(out,
s->pps, s->pps_size,
buf, nal_size, 1)) < 0)
buf, nal_size, 0)) < 0)
goto fail;
} else {
if ((ret=alloc_and_copy(out, NULL, 0, buf, nal_size, unit_type == H264_NAL_SPS || unit_type == H264_NAL_PPS)) < 0)

2
tests/ref/fate/h264-bsf-mp4toannexb
View File

@ -1 +1 @@
f340e7ca9a46d437af4e96f6c8de221c
5f04c27cc6ee8625fe2405fb0f7da9a3

22
tests/ref/fate/h264_mp4toannexb_ticket2991
View File

@ -1,12 +1,12 @@
dba672c154b41414cf26aae967c27eef *tests/data/fate/h264_mp4toannexb_ticket2991.h264
1985823 tests/data/fate/h264_mp4toannexb_ticket2991.h264
#extradata 0: 48, 0x47ae0d55
05d66e60ab22ee004720e0051af0fe74 *tests/data/fate/h264_mp4toannexb_ticket2991.h264
1985815 tests/data/fate/h264_mp4toannexb_ticket2991.h264
#extradata 0: 47, 0x3a590d55
#tb 0: 1/1200000
#media_type 0: video
#codec_id 0: h264
#dimensions 0: 1280x720
#sar 0: 3/4
0, 0, 0, 48000, 37127, 0xc125184c
0, 0, 0, 48000, 37126, 0xb020184c
0, 48000, 48000, 40040, 6920, 0x8512361a, F=0x0
0, 88040, 88040, 40040, 7550, 0x1bc56ed4, F=0x0
0, 128081, 128081, 40040, 8752, 0xb8c6f0a1, F=0x0
@ -21,7 +21,7 @@ dba672c154b41414cf26aae967c27eef *tests/data/fate/h264_mp4toannexb_ticket2991.h2
0, 488444, 488444, 40040, 11234, 0x83cbd9fd, F=0x0
0, 528485, 528485, 40040, 17616, 0xfdf95104, F=0x0
0, 568525, 568525, 40040, 10689, 0x9633d32b, F=0x0
0, 608566, 608566, 40040, 45292, 0x66dd2cf6
0, 608566, 608566, 40040, 45291, 0x543c2cf6
0, 648606, 648606, 40040, 20837, 0x051abfab, F=0x0
0, 688646, 688646, 40040, 21418, 0xe2a59d70, F=0x0
0, 728687, 728687, 40040, 15643, 0x15cf2cec, F=0x0
@ -36,7 +36,7 @@ dba672c154b41414cf26aae967c27eef *tests/data/fate/h264_mp4toannexb_ticket2991.h2
0, 1089050, 1089050, 40040, 13130, 0xcbb6bb8e, F=0x0
0, 1129091, 1129091, 40040, 16180, 0x5d188a7a, F=0x0
0, 1169131, 1169131, 40040, 14961, 0x9ff2f463, F=0x0
0, 1209172, 1209172, 40040, 54297, 0xf98d30ed
0, 1209172, 1209172, 40040, 54296, 0xe6ec30ed
0, 1249212, 1249212, 40040, 11500, 0x8c4852c9, F=0x0
0, 1289252, 1289252, 40040, 12065, 0xfb7954c3, F=0x0
0, 1329293, 1329293, 40040, 12532, 0xf0a935d3, F=0x0
@ -51,7 +51,7 @@ dba672c154b41414cf26aae967c27eef *tests/data/fate/h264_mp4toannexb_ticket2991.h2
0, 1689656, 1689656, 40040, 13250, 0xfed0deb8, F=0x0
0, 1729697, 1729697, 40040, 13360, 0xbf92d476, F=0x0
0, 1769737, 1769737, 40040, 11749, 0x3041eaf1, F=0x0
0, 1809778, 1809778, 40040, 23998, 0xee87d5c4
0, 1809778, 1809778, 40040, 23997, 0xdbe6d5c4
0, 1849818, 1849818, 40040, 16065, 0xe8f715b7, F=0x0
0, 1889858, 1889858, 40040, 16441, 0x0a4e060f, F=0x0
0, 1929899, 1929899, 40040, 17395, 0xa8edecc2, F=0x0
@ -66,7 +66,7 @@ dba672c154b41414cf26aae967c27eef *tests/data/fate/h264_mp4toannexb_ticket2991.h2
0, 2290262, 2290262, 40040, 13748, 0xed26aeb4, F=0x0
0, 2330303, 2330303, 40040, 15092, 0x3c983538, F=0x0
0, 2370343, 2370343, 40040, 14636, 0x9b278a6c, F=0x0
0, 2410384, 2410384, 40040, 29135, 0x0a34be18
0, 2410384, 2410384, 40040, 29134, 0xf784be18
0, 2450424, 2450424, 40040, 10232, 0x5408e15b, F=0x0
0, 2490464, 2490464, 40040, 9769, 0xc93cb7f9, F=0x0
0, 2530505, 2530505, 40040, 14454, 0x45230dbe, F=0x0
@ -81,7 +81,7 @@ dba672c154b41414cf26aae967c27eef *tests/data/fate/h264_mp4toannexb_ticket2991.h2
0, 2890868, 2890868, 40040, 14801, 0x40bae016, F=0x0
0, 2930909, 2930909, 40040, 17303, 0x9ce1fd31, F=0x0
0, 2970949, 2970949, 40040, 17678, 0x9bd66141, F=0x0
0, 3010990, 3010990, 40040, 48673, 0x44b6ce46
0, 3010990, 3010990, 40040, 48672, 0x3215ce46
0, 3051030, 3051030, 40040, 11894, 0x12e1fece, F=0x0
0, 3091070, 3091070, 40040, 16514, 0xc57aed05, F=0x0
0, 3131111, 3131111, 40040, 13044, 0x61914fa0, F=0x0
@ -96,7 +96,7 @@ dba672c154b41414cf26aae967c27eef *tests/data/fate/h264_mp4toannexb_ticket2991.h2
0, 3491474, 3491474, 40040, 12208, 0x81a587c0, F=0x0
0, 3531515, 3531515, 40040, 14709, 0x5dffbe04, F=0x0
0, 3571555, 3571555, 40040, 14390, 0xbfd1e041, F=0x0
0, 3611596, 3611596, 40040, 37237, 0xfa9a24b1
0, 3611596, 3611596, 40040, 37236, 0xe7f924b1
0, 3651636, 3651636, 40040, 14056, 0x24714c7c, F=0x0
0, 3691676, 3691676, 40040, 19438, 0x0c50dcd5, F=0x0
0, 3731717, 3731717, 40040, 21728, 0x7eea4a11, F=0x0
@ -111,7 +111,7 @@ dba672c154b41414cf26aae967c27eef *tests/data/fate/h264_mp4toannexb_ticket2991.h2
0, 4092080, 4092080, 40040, 16878, 0x98efbae2, F=0x0
0, 4132121, 4132121, 40040, 14685, 0x1bf78d65, F=0x0
0, 4172161, 4172161, 40040, 13127, 0x0b91881d, F=0x0
0, 4212202, 4212202, 40040, 29391, 0x0955ed6b
0, 4212202, 4212202, 40040, 29390, 0xf6a5ed6b
0, 4252242, 4252242, 40040, 12576, 0xe9845ded, F=0x0
0, 4292282, 4292282, 40040, 12599, 0x96a79ab8, F=0x0
0, 4332323, 4332323, 40040, 16134, 0xb4c36d3f, F=0x0

10
tests/ref/fate/h264_mp4toannexb_ticket5927
View File

@ -1,12 +1,12 @@
562487bfea635cdadbc23d390322b589 *tests/data/fate/h264_mp4toannexb_ticket5927.h264
595585 tests/data/fate/h264_mp4toannexb_ticket5927.h264
#extradata 0: 34, 0x8df608f8
a3b02fd09392e01619cebc959d4d9ff2 *tests/data/fate/h264_mp4toannexb_ticket5927.h264
595583 tests/data/fate/h264_mp4toannexb_ticket5927.h264
#extradata 0: 33, 0x84fe08f8
#tb 0: 1/1200000
#media_type 0: video
#codec_id 0: h264
#dimensions 0: 1920x1080
#sar 0: 0/1
0, -48000, -9223372036854775808, 48000, 247994, 0x2e1e21ea
0, -48000, -9223372036854775808, 48000, 247993, 0x1ce821ea
0, 0, -9223372036854775808, 48000, 43354, 0xa05dca6f, F=0x0
0, 48000, -9223372036854775808, 48000, 11423, 0x5e8086dd, F=0x0
0, 96000, -9223372036854775808, 48000, 50798, 0x145fbe4f, F=0x0
@ -18,4 +18,4 @@
0, 384000, -9223372036854775808, 48000, 54483, 0xefead99f, F=0x0
0, 432000, -9223372036854775808, 48000, 13705, 0x23cd27e8, F=0x0
0, 480000, -9223372036854775808, 48000, 22308, 0x4093b5af, F=0x0
0, 528000, -9223372036854775808, 48000, 6370, 0x96c12aa1
0, 528000, -9223372036854775808, 48000, 6369, 0x858b2aa1

10
tests/ref/fate/h264_mp4toannexb_ticket5927_2
View File

@ -1,12 +1,12 @@
562487bfea635cdadbc23d390322b589 *tests/data/fate/h264_mp4toannexb_ticket5927_2.h264
595585 tests/data/fate/h264_mp4toannexb_ticket5927_2.h264
#extradata 0: 34, 0x8df608f8
a3b02fd09392e01619cebc959d4d9ff2 *tests/data/fate/h264_mp4toannexb_ticket5927_2.h264
595583 tests/data/fate/h264_mp4toannexb_ticket5927_2.h264
#extradata 0: 33, 0x84fe08f8
#tb 0: 1/1200000
#media_type 0: video
#codec_id 0: h264
#dimensions 0: 1920x1080
#sar 0: 0/1
0, -48000, -9223372036854775808, 48000, 247994, 0x2e1e21ea
0, -48000, -9223372036854775808, 48000, 247993, 0x1ce821ea
0, 0, -9223372036854775808, 48000, 43354, 0xa05dca6f, F=0x0
0, 48000, -9223372036854775808, 48000, 11423, 0x5e8086dd, F=0x0
0, 96000, -9223372036854775808, 48000, 50798, 0x145fbe4f, F=0x0
@ -18,4 +18,4 @@
0, 384000, -9223372036854775808, 48000, 54483, 0xefead99f, F=0x0
0, 432000, -9223372036854775808, 48000, 13705, 0x23cd27e8, F=0x0
0, 480000, -9223372036854775808, 48000, 22308, 0x4093b5af, F=0x0
0, 528000, -9223372036854775808, 48000, 6370, 0x96c12aa1
0, 528000, -9223372036854775808, 48000, 6369, 0x858b2aa1

4
tests/ref/fate/segment-mp4-to-ts
View File

@ -1,10 +1,10 @@
#extradata 0: 51, 0x5d140df9
#extradata 0: 50, 0x4f1b0df9
#tb 0: 1/90000
#media_type 0: video
#codec_id 0: h264
#dimensions 0: 640x360
#sar 0: 1/1
0, -7200, 0, 0, 22631, 0x9cec9541, S=1, 1, 0x00e000e0
0, -7200, 0, 0, 22630, 0x9b109541, S=1, 1, 0x00e000e0
0, -3600, 14400, 0, 4021, 0xbf7cdb02, F=0x0, S=1, 1, 0x00e000e0
0, 0, 7200, 0, 1096, 0x4f162690, F=0x0, S=1, 1, 0x00e000e0
0, 3600, 3600, 0, 687, 0x00394b95, F=0x0, S=1, 1, 0x00e000e0