09c2d08c
 Hu Chunming
arm交付版
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/*
* 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", 11, 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_guess_level(int profile_idc,
int64_t bitrate,
int framerate,
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 > (int64_t)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;
if (framerate > (level->max_mbps / (width_mbs * height_mbs)))
continue;
}
return level;
}
// No usable levels found - frame is too big or bitrate is too high.
return NULL;
}
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