2 * Opus decoder/demuxer common functions
3 * Copyright (c) 2012 Andrew D'Addesio
4 * Copyright (c) 2013-2014 Mozilla Corporation
6 * This file is part of FFmpeg.
8 * FFmpeg is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
13 * FFmpeg is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23 #ifndef AVCODEC_OPUS_H
24 #define AVCODEC_OPUS_H
28 #include "libavutil/audio_fifo.h"
29 #include "libavutil/float_dsp.h"
30 #include "libavutil/frame.h"
32 #include "libswresample/swresample.h"
37 #define MAX_FRAME_SIZE 1275
39 #define MAX_PACKET_DUR 5760
41 #define CELT_SHORT_BLOCKSIZE 120
42 #define CELT_OVERLAP CELT_SHORT_BLOCKSIZE
43 #define CELT_MAX_LOG_BLOCKS 3
44 #define CELT_MAX_FRAME_SIZE (CELT_SHORT_BLOCKSIZE * (1 << CELT_MAX_LOG_BLOCKS))
45 #define CELT_MAX_BANDS 21
47 #define SILK_HISTORY 322
48 #define SILK_MAX_LPC 16
50 #define ROUND_MULL(a,b,s) (((MUL64(a, b) >> ((s) - 1)) + 1) >> 1)
51 #define ROUND_MUL16(a,b) ((MUL16(a, b) + 16384) >> 15)
53 #define OPUS_TS_HEADER 0x7FE0 // 0x3ff (11 bits)
54 #define OPUS_TS_MASK 0xFFE0 // top 11 bits
56 static const uint8_t opus_default_extradata[30] = {
57 'O', 'p', 'u', 's', 'H', 'e', 'a', 'd',
58 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
59 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
71 OPUS_BANDWIDTH_NARROWBAND,
72 OPUS_BANDWIDTH_MEDIUMBAND,
73 OPUS_BANDWIDTH_WIDEBAND,
74 OPUS_BANDWIDTH_SUPERWIDEBAND,
75 OPUS_BANDWIDTH_FULLBAND,
80 typedef struct SilkContext SilkContext;
82 typedef struct CeltFrame CeltFrame;
84 typedef struct OpusPacket {
85 int packet_size; /**< packet size */
86 int data_size; /**< size of the useful data -- packet size - padding */
87 int code; /**< packet code: specifies the frame layout */
88 int stereo; /**< whether this packet is mono or stereo */
89 int vbr; /**< vbr flag */
90 int config; /**< configuration: tells the audio mode,
91 ** bandwidth, and frame duration */
92 int frame_count; /**< frame count */
93 int frame_offset[MAX_FRAMES]; /**< frame offsets */
94 int frame_size[MAX_FRAMES]; /**< frame sizes */
95 int frame_duration; /**< frame duration, in samples @ 48kHz */
96 enum OpusMode mode; /**< mode */
97 enum OpusBandwidth bandwidth; /**< bandwidth */
100 typedef struct OpusStreamContext {
101 AVCodecContext *avctx;
105 OpusRangeCoder redundancy_rc;
108 AVFloatDSPContext *fdsp;
110 float silk_buf[2][960];
111 float *silk_output[2];
112 DECLARE_ALIGNED(32, float, celt_buf)[2][960];
113 float *celt_output[2];
115 DECLARE_ALIGNED(32, float, redundancy_buf)[2][960];
116 float *redundancy_output[2];
118 /* data buffers for the final output data */
123 int out_dummy_allocated_size;
126 AVAudioFifo *celt_delay;
128 /* number of samples we still want to get from the resampler */
136 // a mapping between an opus stream and an output channel
137 typedef struct ChannelMap {
141 // when a single decoded channel is mapped to multiple output channels, we
142 // write to the first output directly and copy from it to the others
143 // this field is set to 1 for those copied output channels
145 // this is the index of the output channel to copy from
148 // this channel is silent
152 typedef struct OpusContext {
154 OpusStreamContext *streams;
157 /* current output buffers for each streams */
160 /* Buffers for synchronizing the streams when they have different
161 * resampling delays */
162 AVAudioFifo **sync_buffers;
163 /* number of decoded samples for each stream */
164 int *decoded_samples;
167 int nb_stereo_streams;
169 AVFloatDSPContext *fdsp;
173 ChannelMap *channel_maps;
176 int ff_opus_parse_packet(OpusPacket *pkt, const uint8_t *buf, int buf_size,
179 int ff_opus_parse_extradata(AVCodecContext *avctx, OpusContext *s);
181 int ff_silk_init(AVCodecContext *avctx, SilkContext **ps, int output_channels);
182 void ff_silk_free(SilkContext **ps);
183 void ff_silk_flush(SilkContext *s);
186 * Decode the LP layer of one Opus frame (which may correspond to several SILK
189 int ff_silk_decode_superframe(SilkContext *s, OpusRangeCoder *rc,
191 enum OpusBandwidth bandwidth, int coded_channels,
194 /* Encode or decode CELT bands */
195 void ff_celt_quant_bands(CeltFrame *f, OpusRangeCoder *rc);
197 /* Encode or decode CELT bitallocation */
198 void ff_celt_bitalloc(CeltFrame *f, OpusRangeCoder *rc, int encode);
200 #endif /* AVCODEC_OPUS_H */