23 #ifndef AVCODEC_OPUS_H
24 #define AVCODEC_OPUS_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
46 #define CELT_VECTORS 11
47 #define CELT_ALLOC_STEPS 6
48 #define CELT_FINE_OFFSET 21
49 #define CELT_MAX_FINE_BITS 8
50 #define CELT_NORM_SCALE 16384
51 #define CELT_QTHETA_OFFSET 4
52 #define CELT_QTHETA_OFFSET_TWOPHASE 16
53 #define CELT_DEEMPH_COEFF 0.85000610f
54 #define CELT_POSTFILTER_MINPERIOD 15
55 #define CELT_ENERGY_SILENCE (-28.0f)
57 #define SILK_HISTORY 322
58 #define SILK_MAX_LPC 16
60 #define ROUND_MULL(a,b,s) (((MUL64(a, b) >> (s - 1)) + 1) >> 1)
61 #define ROUND_MUL16(a,b) ((MUL16(a, b) + 16384) >> 15)
62 #define opus_ilog(i) (av_log2(i) + !!(i))
179 while (rc->
range <= 1<<23) {
187 unsigned int low,
unsigned int high,
190 rc->
value -= scale * (total - high);
191 rc->
range = low ? scale * (high - low)
192 : rc->
range - scale * (total - high);
198 unsigned int k, scale, total, symbol, low, high;
202 scale = rc->
range / total;
203 symbol = rc->
value / scale + 1;
204 symbol = total -
FFMIN(symbol, total);
206 for (k = 0; cdf[k] <= symbol; k++);
208 low = k ? cdf[k-1] : 0;
217 unsigned int k, scale;
220 if (rc->
value >= scale) {
243 unsigned int i, total_bits, rcbuffer, range;
247 range = rc->
range >> (rcbuffer-16);
249 for (i = 0; i < 3; i++) {
251 range = range * range >> 15;
253 rcbuffer = rcbuffer << 1 | bit;
257 return total_bits - rcbuffer;
265 unsigned int value = 0;
286 unsigned int bits, k, scale, total;
289 total = (bits > 8) ? ((size - 1) >> (bits - 8)) + 1 :
size;
291 scale = rc->
range / total;
292 k = rc->
value / scale + 1;
293 k = total -
FFMIN(k, total);
298 return FFMIN(k, size - 1);
307 unsigned int scale, low = 0, center;
309 scale = rc->
range >> 15;
310 center = rc->
value / scale + 1;
311 center = (1 << 15) -
FFMIN(center, 1 << 15);
313 if (center >= symbol) {
316 symbol = 1 + ((32768 - 32 - symbol) * (16384-decay) >> 15);
318 while (symbol > 1 && center >= low + 2 * symbol) {
322 symbol = (((symbol - 2) * decay) >> 15) + 1;
331 if (center < low + symbol)
345 unsigned int k, scale, symbol, total = (k0+1)*3 + k0;
346 scale = rc->
range / total;
347 symbol = rc->
value / scale + 1;
348 symbol = total -
FFMIN(symbol, total);
350 k = (symbol < (k0+1)*3) ? symbol/3 : symbol - (k0+1)*2;
352 opus_rc_update(rc, scale, (k <= k0) ? 3*(k+0) : (k-1-k0) + 3*(k0+1),
353 (k <= k0) ? 3*(k+1) : (k-0-k0) + 3*(k0+1), total);
359 unsigned int k, scale, symbol, total, low, center;
361 total = ((qn>>1) + 1) * ((qn>>1) + 1);
362 scale = rc->
range / total;
363 center = rc->
value / scale + 1;
364 center = total -
FFMIN(center, total);
366 if (center < total >> 1) {
367 k = (
ff_sqrt(8 * center + 1) - 1) >> 1;
368 low = k * (k + 1) >> 1;
371 k = (2*(qn + 1) -
ff_sqrt(8*(total - center - 1) + 1)) >> 1;
372 low = total - ((qn + 1 - k) * (qn + 2 - k) >> 1);
406 float **output,
int coded_channels,
int frame_size,
407 int startband,
int endband);
AVAudioResampleContext * avr
void ff_celt_flush(CeltContext *s)
int frame_count
configuration: tells the audio mode, bandwidth, and frame duration
static av_always_inline unsigned int opus_rc_getsymbol(OpusRangeCoder *rc, const uint16_t *cdf)
float redundancy_buf[2][960]
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
#define DECLARE_ALIGNED(n, t, v)
static av_always_inline unsigned int opus_rc_p2model(OpusRangeCoder *rc, unsigned int bits)
int vbr
whether this packet is mono or stereo
int ff_opus_parse_packet(OpusPacket *pkt, const uint8_t *buf, int buf_size, int self_delimited)
Parse Opus packet info from raw packet data.
unsigned int total_read_bits
void ff_celt_free(CeltContext **s)
bitstream reader API header.
const float ff_celt_window2[120]
static const uint8_t frame_size[4]
ChannelMap * channel_maps
int ff_opus_parse_extradata(AVCodecContext *avctx, OpusContext *s)
static av_always_inline unsigned int opus_rc_tell_frac(const OpusRangeCoder *rc)
reference-counted frame API
Context for an Audio FIFO Buffer.
static float distance(float x, float y, int band)
int ff_celt_init(AVCodecContext *avctx, CeltContext **s, int output_channels)
int frame_size[MAX_FRAMES]
frame offsets
int frame_duration
frame sizes
int out_dummy_allocated_size
Libavcodec external API header.
static av_always_inline unsigned int opus_rc_stepmodel(OpusRangeCoder *rc, int k0)
static av_const unsigned int ff_sqrt(unsigned int a)
void ff_silk_flush(SilkContext *s)
main external API structure.
static av_always_inline void opus_rc_update(OpusRangeCoder *rc, unsigned int scale, unsigned int low, unsigned int high, unsigned int total)
int ff_silk_init(AVCodecContext *avctx, SilkContext **ps, int output_channels)
void ff_silk_free(SilkContext **ps)
enum OpusMode mode
frame duration, in samples @ 48kHz
int stereo
packet code: specifies the frame layout
static av_always_inline unsigned int opus_rc_trimodel(OpusRangeCoder *rc, int qn)
static av_always_inline unsigned int opus_getrawbits(OpusRangeCoder *rc, unsigned int count)
CELT: read 1-25 raw bits at the end of the frame, backwards byte-wise.
static av_always_inline void opus_rc_normalize(OpusRangeCoder *rc)
int ff_silk_decode_superframe(SilkContext *s, OpusRangeCoder *rc, float *output[2], enum OpusBandwidth bandwidth, int coded_channels, int duration_ms)
Decode the LP layer of one Opus frame (which may correspond to several SILK frames).
static av_always_inline unsigned int opus_rc_unimodel(OpusRangeCoder *rc, unsigned int size)
CELT: read a uniform distribution.
int ff_celt_decode_frame(CeltContext *s, OpusRangeCoder *rc, float **output, int coded_channels, int frame_size, int startband, int endband)
OpusStreamContext * streams
OpusRangeCoder redundancy_rc
int frame_offset[MAX_FRAMES]
frame count
static av_always_inline unsigned int opus_rc_tell(const OpusRangeCoder *rc)
CELT: estimate bits of entropy that have thus far been consumed for the current CELT frame...
enum OpusBandwidth bandwidth
mode
float * redundancy_output[2]
static av_always_inline int opus_rc_laplace(OpusRangeCoder *rc, unsigned int symbol, int decay)
int code
size of the useful data – packet size - padding