diff options
Diffstat (limited to 'libavcodec/codec2utils.c')
-rw-r--r-- | libavcodec/codec2utils.c | 80 |
1 files changed, 80 insertions, 0 deletions
diff --git a/libavcodec/codec2utils.c b/libavcodec/codec2utils.c new file mode 100644 index 0000000..931478f --- /dev/null +++ b/libavcodec/codec2utils.c @@ -0,0 +1,80 @@ +/* + * codec2 utility functions + * Copyright (c) 2017 Tomas Härdin + * + * 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 <string.h> +#include "internal.h" +#include "libavcodec/codec2utils.h" + +int avpriv_codec2_mode_bit_rate(void *logctx, int mode) +{ + int frame_size = avpriv_codec2_mode_frame_size(logctx, mode); + int block_align = avpriv_codec2_mode_block_align(logctx, mode); + + if (frame_size <= 0 || block_align <= 0) { + return 0; + } + + return 8 * 8000 * block_align / frame_size; +} + +int avpriv_codec2_mode_frame_size(void *logctx, int mode) +{ + int frame_size_table[AVPRIV_CODEC2_MODE_MAX+1] = { + 160, // 3200 + 160, // 2400 + 320, // 1600 + 320, // 1400 + 320, // 1300 + 320, // 1200 + 320, // 700 + 320, // 700B + 320, // 700C + }; + + if (mode < 0 || mode > AVPRIV_CODEC2_MODE_MAX) { + av_log(logctx, AV_LOG_ERROR, "unknown codec2 mode %i, can't find frame_size\n", mode); + return 0; + } else { + return frame_size_table[mode]; + } +} + +int avpriv_codec2_mode_block_align(void *logctx, int mode) +{ + int block_align_table[AVPRIV_CODEC2_MODE_MAX+1] = { + 8, // 3200 + 6, // 2400 + 8, // 1600 + 7, // 1400 + 7, // 1300 + 6, // 1200 + 4, // 700 + 4, // 700B + 4, // 700C + }; + + if (mode < 0 || mode > AVPRIV_CODEC2_MODE_MAX) { + av_log(logctx, AV_LOG_ERROR, "unknown codec2 mode %i, can't find block_align\n", mode); + return 0; + } else { + return block_align_table[mode]; + } +} |