1/* 2 * Opus encoder 3 * Copyright (c) 2017 Rostislav Pehlivanov <atomnuker@gmail.com> 4 * 5 * This file is part of FFmpeg. 6 * 7 * FFmpeg is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU Lesser General Public 9 * License as published by the Free Software Foundation; either 10 * version 2.1 of the License, or (at your option) any later version. 11 * 12 * FFmpeg is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 * Lesser General Public License for more details. 16 * 17 * You should have received a copy of the GNU Lesser General Public 18 * License along with FFmpeg; if not, write to the Free Software 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 20 */ 21 22#ifndef AVCODEC_OPUSENC_H 23#define AVCODEC_OPUSENC_H 24 25#include "opus_celt.h" 26 27/* Determines the maximum delay the psychoacoustic system will use for lookahead */ 28#define FF_BUFQUEUE_SIZE 145 29#include "libavfilter/bufferqueue.h" 30 31#define OPUS_MAX_LOOKAHEAD ((FF_BUFQUEUE_SIZE - 1)*2.5f) 32 33#define OPUS_MAX_CHANNELS 2 34 35/* 120 ms / 2.5 ms = 48 frames (extremely improbable, but the encoder'll work) */ 36#define OPUS_MAX_FRAMES_PER_PACKET 48 37 38#define OPUS_BLOCK_SIZE(x) (2 * 15 * (1 << ((x) + 2))) 39 40#define OPUS_SAMPLES_TO_BLOCK_SIZE(x) (ff_log2((x) / (2 * 15)) - 2) 41 42typedef struct OpusEncOptions { 43 float max_delay_ms; 44 int apply_phase_inv; 45} OpusEncOptions; 46 47typedef struct OpusPacketInfo { 48 enum OpusMode mode; 49 enum OpusBandwidth bandwidth; 50 int framesize; 51 int frames; 52} OpusPacketInfo; 53 54#endif /* AVCODEC_OPUSENC_H */ 55