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lavc/h264: Add common code for level handling 

Including a unit test.
tags/n4.1
Mark Thompson 6 years ago
parent
40724026b7
commit
cc549149d3
6 changed files with 374 additions and 1 deletions
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  1. +2
    -1
      libavcodec/Makefile
  2. +130
    -0
      libavcodec/h264_levels.c
  3. +53
    -0
      libavcodec/h264_levels.h
  4. +1
    -0
      libavcodec/tests/.gitignore
  5. +183
    -0
      libavcodec/tests/h264_levels.c
  6. +5
    -0
      tests/fate/libavcodec.mak

+ 2
- 1
libavcodec/Makefile View File

@@ -1059,7 +1059,7 @@ OBJS-$(CONFIG_EAC3_CORE_BSF) += eac3_core_bsf.o
OBJS-$(CONFIG_EXTRACT_EXTRADATA_BSF) += extract_extradata_bsf.o \
av1_parse.o h2645_parse.o
OBJS-$(CONFIG_FILTER_UNITS_BSF) += filter_units_bsf.o
OBJS-$(CONFIG_H264_METADATA_BSF) += h264_metadata_bsf.o
OBJS-$(CONFIG_H264_METADATA_BSF) += h264_metadata_bsf.o h264_levels.o
OBJS-$(CONFIG_H264_MP4TOANNEXB_BSF) += h264_mp4toannexb_bsf.o
OBJS-$(CONFIG_H264_REDUNDANT_PPS_BSF) += h264_redundant_pps_bsf.o
OBJS-$(CONFIG_HAPQA_EXTRACT_BSF) += hapqa_extract_bsf.o hap.o
@@ -1140,6 +1140,7 @@ TESTPROGS-$(CONFIG_IDCTDSP) += dct
TESTPROGS-$(CONFIG_IIRFILTER) += iirfilter
TESTPROGS-$(HAVE_MMX) += motion
TESTPROGS-$(CONFIG_MPEGVIDEO) += mpeg12framerate
TESTPROGS-$(CONFIG_H264_METADATA_BSF) += h264_levels
TESTPROGS-$(CONFIG_RANGECODER) += rangecoder
TESTPROGS-$(CONFIG_SNOW_ENCODER) += snowenc



+ 130
- 0
libavcodec/h264_levels.c View File

@@ -0,0 +1,130 @@
/*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/

#include "avcodec.h"
#include "h264_levels.h"

// H.264 table A-1.
static const H264LevelDescriptor h264_levels[] = {
// Name MaxMBPS MaxBR MinCR
// | level_idc | MaxFS | MaxCPB | MaxMvsPer2Mb
// | | cs3f | | MaxDpbMbs | | MaxVmvR | |
{ "1", 10, 0, 1485, 99, 396, 64, 175, 64, 2, 0 },
{ "1b", 10, 1, 1485, 99, 396, 128, 350, 64, 2, 0 },
{ "1b", 9, 0, 1485, 99, 396, 128, 350, 64, 2, 0 },
{ "1.1", 11, 0, 3000, 396, 900, 192, 500, 128, 2, 0 },
{ "1.2", 12, 0, 6000, 396, 2376, 384, 1000, 128, 2, 0 },
{ "1.3", 13, 0, 11880, 396, 2376, 768, 2000, 128, 2, 0 },
{ "2", 20, 0, 11880, 396, 2376, 2000, 2000, 128, 2, 0 },
{ "2.1", 21, 0, 19800, 792, 4752, 4000, 4000, 256, 2, 0 },
{ "2.2", 22, 0, 20250, 1620, 8100, 4000, 4000, 256, 2, 0 },
{ "3", 30, 0, 40500, 1620, 8100, 10000, 10000, 256, 2, 32 },
{ "3.1", 31, 0, 108000, 3600, 18000, 14000, 14000, 512, 4, 16 },
{ "3.2", 32, 0, 216000, 5120, 20480, 20000, 20000, 512, 4, 16 },
{ "4", 40, 0, 245760, 8192, 32768, 20000, 25000, 512, 4, 16 },
{ "4.1", 41, 0, 245760, 8192, 32768, 50000, 62500, 512, 2, 16 },
{ "4.2", 42, 0, 522240, 8704, 34816, 50000, 62500, 512, 2, 16 },
{ "5", 50, 0, 589824, 22080, 110400, 135000, 135000, 512, 2, 16 },
{ "5.1", 51, 0, 983040, 36864, 184320, 240000, 240000, 512, 2, 16 },
{ "5.2", 52, 0, 2073600, 36864, 184320, 240000, 240000, 512, 2, 16 },
{ "6", 60, 0, 4177920, 139264, 696320, 240000, 240000, 8192, 2, 16 },
{ "6.1", 61, 0, 8355840, 139264, 696320, 480000, 480000, 8192, 2, 16 },
{ "6.2", 62, 0, 16711680, 139264, 696320, 800000, 800000, 8192, 2, 16 },
};

// H.264 table A-2 plus values from A-1.
static const struct {
int profile_idc;
int cpb_br_vcl_factor;
int cpb_br_nal_factor;
} h264_br_factors[] = {
{ 66, 1000, 1200 },
{ 77, 1000, 1200 },
{ 88, 1000, 1200 },
{ 100, 1250, 1500 },
{ 110, 3000, 3600 },
{ 122, 4000, 4800 },
{ 244, 4000, 4800 },
{ 44, 4000, 4800 },
};

// We are only ever interested in the NAL bitrate factor.
static int h264_get_br_factor(int profile_idc)
{
int i;
for (i = 0; i < FF_ARRAY_ELEMS(h264_br_factors); i++) {
if (h264_br_factors[i].profile_idc == profile_idc)
return h264_br_factors[i].cpb_br_nal_factor;
}
// Default to the non-high profile value if not specified.
return 1200;
}

const H264LevelDescriptor *ff_h264_get_level(int level_idc,
int constraint_set3_flag)
{
int i;
for (i = 0; i < FF_ARRAY_ELEMS(h264_levels); i++) {
if (h264_levels[i].level_idc == level_idc &&
h264_levels[i].constraint_set3_flag == constraint_set3_flag)
return &h264_levels[i];
}
return NULL;
}

const H264LevelDescriptor *ff_h264_guess_level(int profile_idc,
int64_t bitrate,
int width, int height,
int max_dec_frame_buffering)
{
int width_mbs = (width + 15) / 16;
int height_mbs = (height + 15) / 16;
int no_cs3f = !(profile_idc == 66 ||
profile_idc == 77 ||
profile_idc == 88);
int i;

for (i = 0; i < FF_ARRAY_ELEMS(h264_levels); i++) {
const H264LevelDescriptor *level = &h264_levels[i];

if (level->constraint_set3_flag && no_cs3f)
continue;

if (bitrate > level->max_br * h264_get_br_factor(profile_idc))
continue;

if (width_mbs * height_mbs > level->max_fs)
continue;
if (width_mbs * width_mbs > 8 * level->max_fs)
continue;
if (height_mbs * height_mbs > 8 * level->max_fs)
continue;

if (width_mbs && height_mbs) {
int max_dpb_frames =
FFMIN(level->max_dpb_mbs / (width_mbs * height_mbs), 16);
if (max_dec_frame_buffering > max_dpb_frames)
continue;
}

return level;
}

// No usable levels found - frame is too big or bitrate is too high.
return NULL;
}

+ 53
- 0
libavcodec/h264_levels.h View File

@@ -0,0 +1,53 @@
/*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/

#ifndef AVCODEC_H264_LEVELS_H
#define AVCODEC_H264_LEVELS_H


#include <stdint.h>

typedef struct H264LevelDescriptor {
const char *name;
uint8_t level_idc;
uint8_t constraint_set3_flag;
uint32_t max_mbps;
uint32_t max_fs;
uint32_t max_dpb_mbs;
uint32_t max_br;
uint32_t max_cpb;
uint16_t max_v_mv_r;
uint8_t min_cr;
uint8_t max_mvs_per_2mb;
} H264LevelDescriptor;

const H264LevelDescriptor *ff_h264_get_level(int level_idc,
int constraint_set3_flag);

/**
* Guess the level of a stream from some parameters.
*
* Unknown parameters may be zero, in which case they are ignored.
*/
const H264LevelDescriptor *ff_h264_guess_level(int profile_idc,
int64_t bitrate,
int width, int height,
int max_dec_frame_buffering);


#endif /* AVCODEC_H264_LEVELS_H */

+ 1
- 0
libavcodec/tests/.gitignore View File

@@ -7,6 +7,7 @@
/fft-fixed
/fft-fixed32
/golomb
/h264_levels
/htmlsubtitles
/iirfilter
/imgconvert


+ 183
- 0
libavcodec/tests/h264_levels.c View File

@@ -0,0 +1,183 @@
/*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/

#include "libavutil/common.h"
#include "libavcodec/h264_levels.h"

static const struct {
int width;
int height;
int level_idc;
} test_sizes[] = {
// First level usable at some standard sizes.
// (From H.264 table A-6.)
{ 176, 144, 10 }, // QCIF
{ 352, 288, 11 }, // CIF
{ 640, 480, 22 }, // VGA
{ 720, 480, 22 }, // NTSC
{ 720, 576, 22 }, // PAL
{ 800, 600, 31 }, // SVGA
{ 1280, 720, 31 }, // 720p
{ 1280, 1024, 32 }, // SXGA
{ 1920, 1080, 40 }, // 1080p
{ 2048, 1080, 42 }, // 2Kx1080
{ 2048, 1536, 50 }, // 4XGA
{ 3840, 2160, 51 }, // 4K
{ 7680, 4320, 60 }, // 8K

// Overly wide or tall sizes.
{ 1, 256, 10 },
{ 1, 512, 11 },
{ 1, 1024, 21 },
{ 1, 1808, 22 },
{ 1, 1824, 31 },
{ 256, 1, 10 },
{ 512, 1, 11 },
{ 1024, 1, 21 },
{ 1808, 1, 22 },
{ 1824, 1, 31 },
{ 512, 4096, 40 },
{ 256, 4112, 42 },
{ 8688, 1024, 51 },
{ 8704, 512, 60 },
{ 16880, 1, 60 },
{ 16896, 1, 0 },
};

static const struct {
int width;
int height;
int dpb_size;
int level_idc;
} test_dpb[] = {
// First level usable for some DPB sizes.
// (From H.264 table A-7.)
{ 176, 144, 4, 10 },
{ 176, 144, 8, 11 },
{ 176, 144, 16, 12 },
{ 1280, 720, 1, 31 },
{ 1280, 720, 5, 31 },
{ 1280, 720, 9, 40 },
{ 1280, 720, 10, 50 },
{ 1920, 1080, 1, 40 },
{ 1920, 1080, 5, 50 },
{ 1920, 1080, 13, 50 },
{ 1920, 1080, 14, 51 },
{ 3840, 2160, 5, 51 },
{ 3840, 2160, 6, 60 },
{ 3840, 2160, 16, 60 },
{ 7680, 4320, 5, 60 },
{ 7680, 4320, 6, 0 },
};

static const struct {
int64_t bitrate;
int profile_idc;
int level_idc;
} test_bitrate[] = {
// Values where profile affects level at a given bitrate.
{ 2500000, 77, 21 },
{ 2500000, 100, 20 },
{ 2500000, 244, 13 },
{ 100000000, 77, 50 },
{ 100000000, 100, 50 },
{ 100000000, 244, 41 },
{ 999999999, 77, 0 },
{ 999999999, 100, 62 },
// Check level 1b.
{ 32 * 1200, 66, 10 },
{ 32 * 1500, 100, 10 },
{ 96 * 1200, 66, 10 },
{ 96 * 1500, 100, 9 },
{ 144 * 1200, 66, 11 },
{ 144 * 1500, 100, 11 },
};

static const struct {
const char *name;
int profile_idc;
int64_t bitrate;
int width;
int height;
int dpb_frames;
int level_idc;
} test_all[] = {
{ "Bluray 1080p 40Mb/s", 100, 40000000, 1920, 1080, 4, 41 },
{ "Bluray 1080p 24Mb/s", 100, 24000000, 1920, 1080, 4, 40 },
{ "Bluray 720p 40Mb/s", 100, 40000000, 1280, 720, 6, 41 },
{ "Bluray 720p 24Mb/s", 100, 24000000, 1280, 720, 6, 40 },
{ "Bluray PAL 40Mb/s", 100, 40000000, 720, 576, 6, 41 },
{ "Bluray PAL 24Mb/s", 100, 24000000, 720, 576, 6, 32 },
{ "Bluray PAL 16Mb/s", 100, 16800000, 720, 576, 6, 31 },
{ "Bluray PAL 12Mb/s", 100, 12000000, 720, 576, 5, 30 },
{ "Bluray NTSC 40Mb/s", 100, 40000000, 720, 480, 6, 41 },
{ "Bluray NTSC 24Mb/s", 100, 24000000, 720, 480, 6, 32 },
{ "Bluray NTSC 16Mb/s", 100, 16800000, 720, 480, 6, 31 },
{ "Bluray NTSC 12Mb/s", 100, 12000000, 720, 480, 6, 30 },
};

int main(void)
{
const H264LevelDescriptor *level;
int i;

#define CHECK(expected, format, ...) do { \
if (expected ? (!level || level->level_idc != expected) \
: !!level) { \
av_log(NULL, AV_LOG_ERROR, "Incorrect level for " \
format ": expected %d, got %d.\n", __VA_ARGS__, \
expected, level ? level->level_idc : -1); \
return 1; \
} \
} while (0)

for (i = 0; i < FF_ARRAY_ELEMS(test_sizes); i++) {
level = ff_h264_guess_level(0, 0, test_sizes[i].width,
test_sizes[i].height, 0);
CHECK(test_sizes[i].level_idc, "size %dx%d",
test_sizes[i].width, test_sizes[i].height);
}

for (i = 0; i < FF_ARRAY_ELEMS(test_dpb); i++) {
level = ff_h264_guess_level(0, 0, test_dpb[i].width,
test_dpb[i].height,
test_dpb[i].dpb_size);
CHECK(test_dpb[i].level_idc, "size %dx%d dpb %d",
test_dpb[i].width, test_dpb[i].height,
test_dpb[i].dpb_size);
}

for (i = 0; i < FF_ARRAY_ELEMS(test_bitrate); i++) {
level = ff_h264_guess_level(test_bitrate[i].profile_idc,
test_bitrate[i].bitrate,
0, 0, 0);
CHECK(test_bitrate[i].level_idc, "bitrate %"PRId64" profile %d",
test_bitrate[i].bitrate, test_bitrate[i].profile_idc);
}

for (i = 0; i < FF_ARRAY_ELEMS(test_all); i++) {
level = ff_h264_guess_level(test_all[i].profile_idc,
test_all[i].bitrate,
test_all[i].width,
test_all[i].height,
test_all[i].dpb_frames);
CHECK(test_all[i].level_idc, "%s", test_all[i].name);
}

return 0;
}

+ 5
- 0
tests/fate/libavcodec.mak View File

@@ -46,6 +46,11 @@ fate-dct8x8: libavcodec/tests/dct$(EXESUF)
fate-dct8x8: CMD = run libavcodec/tests/dct
fate-dct8x8: CMP = null

FATE_LIBAVCODEC-$(CONFIG_H264_VAAPI_ENCODER) += fate-h264-levels
fate-h264-levels: libavcodec/tests/h264_levels$(EXESUF)
fate-h264-levels: CMD = run libavcodec/tests/h264_levels
fate-h264-levels: REF = /dev/null

FATE_LIBAVCODEC-$(CONFIG_IIRFILTER) += fate-iirfilter
fate-iirfilter: libavcodec/tests/iirfilter$(EXESUF)
fate-iirfilter: CMD = run libavcodec/tests/iirfilter


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