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/* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#include "avcodec.h" |
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#include "h264_levels.h" |
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// H.264 table A-1. |
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static const H264LevelDescriptor h264_levels[] = { |
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// Name MaxMBPS MaxBR MinCR |
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// | level_idc | MaxFS | MaxCPB | MaxMvsPer2Mb |
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// | | cs3f | | MaxDpbMbs | | MaxVmvR | | |
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{ "1", 10, 0, 1485, 99, 396, 64, 175, 64, 2, 0 }, |
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{ "1b", 11, 1, 1485, 99, 396, 128, 350, 64, 2, 0 }, |
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{ "1b", 9, 0, 1485, 99, 396, 128, 350, 64, 2, 0 }, |
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{ "1.1", 11, 0, 3000, 396, 900, 192, 500, 128, 2, 0 }, |
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{ "1.2", 12, 0, 6000, 396, 2376, 384, 1000, 128, 2, 0 }, |
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{ "1.3", 13, 0, 11880, 396, 2376, 768, 2000, 128, 2, 0 }, |
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{ "2", 20, 0, 11880, 396, 2376, 2000, 2000, 128, 2, 0 }, |
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{ "2.1", 21, 0, 19800, 792, 4752, 4000, 4000, 256, 2, 0 }, |
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{ "2.2", 22, 0, 20250, 1620, 8100, 4000, 4000, 256, 2, 0 }, |
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{ "3", 30, 0, 40500, 1620, 8100, 10000, 10000, 256, 2, 32 }, |
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{ "3.1", 31, 0, 108000, 3600, 18000, 14000, 14000, 512, 4, 16 }, |
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{ "3.2", 32, 0, 216000, 5120, 20480, 20000, 20000, 512, 4, 16 }, |
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{ "4", 40, 0, 245760, 8192, 32768, 20000, 25000, 512, 4, 16 }, |
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{ "4.1", 41, 0, 245760, 8192, 32768, 50000, 62500, 512, 2, 16 }, |
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{ "4.2", 42, 0, 522240, 8704, 34816, 50000, 62500, 512, 2, 16 }, |
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{ "5", 50, 0, 589824, 22080, 110400, 135000, 135000, 512, 2, 16 }, |
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{ "5.1", 51, 0, 983040, 36864, 184320, 240000, 240000, 512, 2, 16 }, |
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{ "5.2", 52, 0, 2073600, 36864, 184320, 240000, 240000, 512, 2, 16 }, |
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{ "6", 60, 0, 4177920, 139264, 696320, 240000, 240000, 8192, 2, 16 }, |
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{ "6.1", 61, 0, 8355840, 139264, 696320, 480000, 480000, 8192, 2, 16 }, |
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{ "6.2", 62, 0, 16711680, 139264, 696320, 800000, 800000, 8192, 2, 16 }, |
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}; |
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// H.264 table A-2 plus values from A-1. |
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static const struct { |
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int profile_idc; |
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int cpb_br_vcl_factor; |
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int cpb_br_nal_factor; |
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} h264_br_factors[] = { |
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{ 66, 1000, 1200 }, |
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{ 77, 1000, 1200 }, |
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{ 88, 1000, 1200 }, |
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{ 100, 1250, 1500 }, |
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{ 110, 3000, 3600 }, |
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{ 122, 4000, 4800 }, |
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{ 244, 4000, 4800 }, |
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{ 44, 4000, 4800 }, |
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}; |
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// We are only ever interested in the NAL bitrate factor. |
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static int h264_get_br_factor(int profile_idc) |
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{ |
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int i; |
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✓✓ |
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for (i = 0; i < FF_ARRAY_ELEMS(h264_br_factors); i++) { |
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✓✓ |
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if (h264_br_factors[i].profile_idc == profile_idc) |
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return h264_br_factors[i].cpb_br_nal_factor; |
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} |
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// Default to the non-high profile value if not specified. |
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return 1200; |
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} |
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const H264LevelDescriptor *ff_h264_guess_level(int profile_idc, |
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int64_t bitrate, |
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int framerate, |
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int width, int height, |
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int max_dec_frame_buffering) |
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{ |
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int width_mbs = (width + 15) / 16; |
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int height_mbs = (height + 15) / 16; |
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✓✓✓✓
✓✗ |
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int no_cs3f = !(profile_idc == 66 || |
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profile_idc == 77 || |
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profile_idc == 88); |
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int i; |
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✓✓ |
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for (i = 0; i < FF_ARRAY_ELEMS(h264_levels); i++) { |
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const H264LevelDescriptor *level = &h264_levels[i]; |
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✓✓✓✓
|
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if (level->constraint_set3_flag && no_cs3f) |
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continue; |
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✓✓ |
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if (bitrate > (int64_t)level->max_br * h264_get_br_factor(profile_idc)) |
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continue; |
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✓✓ |
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if (width_mbs * height_mbs > level->max_fs) |
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continue; |
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✓✓ |
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if (width_mbs * width_mbs > 8 * level->max_fs) |
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continue; |
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✓✓ |
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if (height_mbs * height_mbs > 8 * level->max_fs) |
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continue; |
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✓✓✓✗
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if (width_mbs && height_mbs) { |
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int max_dpb_frames = |
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FFMIN(level->max_dpb_mbs / (width_mbs * height_mbs), 16); |
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✓✓ |
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if (max_dec_frame_buffering > max_dpb_frames) |
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continue; |
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✓✓ |
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if (framerate > (level->max_mbps / (width_mbs * height_mbs))) |
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continue; |
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} |
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return level; |
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} |
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// No usable levels found - frame is too big or bitrate is too high. |
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return NULL; |
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} |