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-rw-r--r--libavcodec/opus.h300
1 files changed, 35 insertions, 265 deletions
diff --git a/libavcodec/opus.h b/libavcodec/opus.h
index fbf67c9..edbaab5 100644
--- a/libavcodec/opus.h
+++ b/libavcodec/opus.h
@@ -3,20 +3,20 @@
* Copyright (c) 2012 Andrew D'Addesio
* Copyright (c) 2013-2014 Mozilla Corporation
*
- * This file is part of Libav.
+ * This file is part of FFmpeg.
*
- * Libav is free software; you can redistribute it and/or
+ * 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.
*
- * Libav is distributed in the hope that it will be useful,
+ * 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 Libav; if not, write to the Free Software
+ * License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
@@ -29,10 +29,10 @@
#include "libavutil/float_dsp.h"
#include "libavutil/frame.h"
-#include "libavresample/avresample.h"
+#include "libswresample/swresample.h"
#include "avcodec.h"
-#include "bitstream.h"
+#include "opus_rc.h"
#define MAX_FRAME_SIZE 1275
#define MAX_FRAMES 48
@@ -43,23 +43,12 @@
#define CELT_MAX_LOG_BLOCKS 3
#define CELT_MAX_FRAME_SIZE (CELT_SHORT_BLOCKSIZE * (1 << CELT_MAX_LOG_BLOCKS))
#define CELT_MAX_BANDS 21
-#define CELT_VECTORS 11
-#define CELT_ALLOC_STEPS 6
-#define CELT_FINE_OFFSET 21
-#define CELT_MAX_FINE_BITS 8
-#define CELT_NORM_SCALE 16384
-#define CELT_QTHETA_OFFSET 4
-#define CELT_QTHETA_OFFSET_TWOPHASE 16
-#define CELT_DEEMPH_COEFF 0.85000610f
-#define CELT_POSTFILTER_MINPERIOD 15
-#define CELT_ENERGY_SILENCE (-28.0f)
#define SILK_HISTORY 322
#define SILK_MAX_LPC 16
-#define ROUND_MULL(a,b,s) (((MUL64(a, b) >> (s - 1)) + 1) >> 1)
+#define ROUND_MULL(a,b,s) (((MUL64(a, b) >> ((s) - 1)) + 1) >> 1)
#define ROUND_MUL16(a,b) ((MUL16(a, b) + 16384) >> 15)
-#define opus_ilog(i) (av_log2(i) + !!(i))
#define OPUS_TS_HEADER 0x7FE0 // 0x3ff (11 bits)
#define OPUS_TS_MASK 0xFFE0 // top 11 bits
@@ -73,7 +62,9 @@ static const uint8_t opus_default_extradata[30] = {
enum OpusMode {
OPUS_MODE_SILK,
OPUS_MODE_HYBRID,
- OPUS_MODE_CELT
+ OPUS_MODE_CELT,
+
+ OPUS_MODE_NB
};
enum OpusBandwidth {
@@ -81,42 +72,29 @@ enum OpusBandwidth {
OPUS_BANDWIDTH_MEDIUMBAND,
OPUS_BANDWIDTH_WIDEBAND,
OPUS_BANDWIDTH_SUPERWIDEBAND,
- OPUS_BANDWIDTH_FULLBAND
-};
+ OPUS_BANDWIDTH_FULLBAND,
-typedef struct RawBitsContext {
- const uint8_t *position;
- unsigned int bytes;
- unsigned int cachelen;
- unsigned int cacheval;
-} RawBitsContext;
-
-typedef struct OpusRangeCoder {
- BitstreamContext bc;
- RawBitsContext rb;
- unsigned int range;
- unsigned int value;
- unsigned int total_read_bits;
-} OpusRangeCoder;
+ OPUS_BANDWITH_NB
+};
typedef struct SilkContext SilkContext;
-typedef struct CeltContext CeltContext;
+typedef struct CeltFrame CeltFrame;
typedef struct OpusPacket {
- int packet_size; /** packet size */
- int data_size; /** size of the useful data -- packet size - padding */
- int code; /** packet code: specifies the frame layout */
- int stereo; /** whether this packet is mono or stereo */
- int vbr; /** vbr flag */
- int config; /** configuration: tells the audio mode,
+ int packet_size; /**< packet size */
+ int data_size; /**< size of the useful data -- packet size - padding */
+ int code; /**< packet code: specifies the frame layout */
+ int stereo; /**< whether this packet is mono or stereo */
+ int vbr; /**< vbr flag */
+ int config; /**< configuration: tells the audio mode,
** bandwidth, and frame duration */
- int frame_count; /** frame count */
- int frame_offset[MAX_FRAMES]; /** frame offsets */
- int frame_size[MAX_FRAMES]; /** frame sizes */
- int frame_duration; /** frame duration, in samples @ 48kHz */
- enum OpusMode mode; /** mode */
- enum OpusBandwidth bandwidth; /** bandwidth */
+ int frame_count; /**< frame count */
+ int frame_offset[MAX_FRAMES]; /**< frame offsets */
+ int frame_size[MAX_FRAMES]; /**< frame sizes */
+ int frame_duration; /**< frame duration, in samples @ 48kHz */
+ enum OpusMode mode; /**< mode */
+ enum OpusBandwidth bandwidth; /**< bandwidth */
} OpusPacket;
typedef struct OpusStreamContext {
@@ -126,7 +104,7 @@ typedef struct OpusStreamContext {
OpusRangeCoder rc;
OpusRangeCoder redundancy_rc;
SilkContext *silk;
- CeltContext *celt;
+ CeltFrame *celt;
AVFloatDSPContext *fdsp;
float silk_buf[2][960];
@@ -144,7 +122,7 @@ typedef struct OpusStreamContext {
float *out_dummy;
int out_dummy_allocated_size;
- AVAudioResampleContext *avr;
+ SwrContext *swr;
AVAudioFifo *celt_delay;
int silk_samplerate;
/* number of samples we still want to get from the resampler */
@@ -172,7 +150,9 @@ typedef struct ChannelMap {
} ChannelMap;
typedef struct OpusContext {
+ AVClass *av_class;
OpusStreamContext *streams;
+ int apply_phase_inv;
/* current output buffers for each streams */
float **out;
@@ -186,217 +166,13 @@ typedef struct OpusContext {
int nb_streams;
int nb_stereo_streams;
- AVFloatDSPContext fdsp;
+ AVFloatDSPContext *fdsp;
int16_t gain_i;
float gain;
ChannelMap *channel_maps;
} OpusContext;
-static av_always_inline void opus_rc_normalize(OpusRangeCoder *rc)
-{
- while (rc->range <= 1<<23) {
- rc->value = ((rc->value << 8) | (bitstream_read(&rc->bc, 8) ^ 0xFF)) & ((1u << 31) - 1);
- rc->range <<= 8;
- rc->total_read_bits += 8;
- }
-}
-
-static av_always_inline void opus_rc_update(OpusRangeCoder *rc, unsigned int scale,
- unsigned int low, unsigned int high,
- unsigned int total)
-{
- rc->value -= scale * (total - high);
- rc->range = low ? scale * (high - low)
- : rc->range - scale * (total - high);
- opus_rc_normalize(rc);
-}
-
-static av_always_inline unsigned int opus_rc_getsymbol(OpusRangeCoder *rc, const uint16_t *cdf)
-{
- unsigned int k, scale, total, symbol, low, high;
-
- total = *cdf++;
-
- scale = rc->range / total;
- symbol = rc->value / scale + 1;
- symbol = total - FFMIN(symbol, total);
-
- for (k = 0; cdf[k] <= symbol; k++);
- high = cdf[k];
- low = k ? cdf[k-1] : 0;
-
- opus_rc_update(rc, scale, low, high, total);
-
- return k;
-}
-
-static av_always_inline unsigned int opus_rc_p2model(OpusRangeCoder *rc, unsigned int bits)
-{
- unsigned int k, scale;
- scale = rc->range >> bits; // in this case, scale = symbol
-
- if (rc->value >= scale) {
- rc->value -= scale;
- rc->range -= scale;
- k = 0;
- } else {
- rc->range = scale;
- k = 1;
- }
- opus_rc_normalize(rc);
- return k;
-}
-
-/**
- * CELT: estimate bits of entropy that have thus far been consumed for the
- * current CELT frame, to integer and fractional (1/8th bit) precision
- */
-static av_always_inline unsigned int opus_rc_tell(const OpusRangeCoder *rc)
-{
- return rc->total_read_bits - av_log2(rc->range) - 1;
-}
-
-static av_always_inline unsigned int opus_rc_tell_frac(const OpusRangeCoder *rc)
-{
- unsigned int i, total_bits, rcbuffer, range;
-
- total_bits = rc->total_read_bits << 3;
- rcbuffer = av_log2(rc->range) + 1;
- range = rc->range >> (rcbuffer-16);
-
- for (i = 0; i < 3; i++) {
- int bit;
- range = range * range >> 15;
- bit = range >> 16;
- rcbuffer = rcbuffer << 1 | bit;
- range >>= bit;
- }
-
- return total_bits - rcbuffer;
-}
-
-/**
- * CELT: read 1-25 raw bits at the end of the frame, backwards byte-wise
- */
-static av_always_inline unsigned int opus_getrawbits(OpusRangeCoder *rc, unsigned int count)
-{
- unsigned int value = 0;
-
- while (rc->rb.bytes && rc->rb.cachelen < count) {
- rc->rb.cacheval |= *--rc->rb.position << rc->rb.cachelen;
- rc->rb.cachelen += 8;
- rc->rb.bytes--;
- }
-
- value = rc->rb.cacheval & ((1<<count)-1);
- rc->rb.cacheval >>= count;
- rc->rb.cachelen -= count;
- rc->total_read_bits += count;
-
- return value;
-}
-
-/**
- * CELT: read a uniform distribution
- */
-static av_always_inline unsigned int opus_rc_unimodel(OpusRangeCoder *rc, unsigned int size)
-{
- unsigned int bits, k, scale, total;
-
- bits = opus_ilog(size - 1);
- total = (bits > 8) ? ((size - 1) >> (bits - 8)) + 1 : size;
-
- scale = rc->range / total;
- k = rc->value / scale + 1;
- k = total - FFMIN(k, total);
- opus_rc_update(rc, scale, k, k + 1, total);
-
- if (bits > 8) {
- k = k << (bits - 8) | opus_getrawbits(rc, bits - 8);
- return FFMIN(k, size - 1);
- } else
- return k;
-}
-
-static av_always_inline int opus_rc_laplace(OpusRangeCoder *rc, unsigned int symbol, int decay)
-{
- /* extends the range coder to model a Laplace distribution */
- int value = 0;
- unsigned int scale, low = 0, center;
-
- scale = rc->range >> 15;
- center = rc->value / scale + 1;
- center = (1 << 15) - FFMIN(center, 1 << 15);
-
- if (center >= symbol) {
- value++;
- low = symbol;
- symbol = 1 + ((32768 - 32 - symbol) * (16384-decay) >> 15);
-
- while (symbol > 1 && center >= low + 2 * symbol) {
- value++;
- symbol *= 2;
- low += symbol;
- symbol = (((symbol - 2) * decay) >> 15) + 1;
- }
-
- if (symbol <= 1) {
- int distance = (center - low) >> 1;
- value += distance;
- low += 2 * distance;
- }
-
- if (center < low + symbol)
- value *= -1;
- else
- low += symbol;
- }
-
- opus_rc_update(rc, scale, low, FFMIN(low + symbol, 32768), 32768);
-
- return value;
-}
-
-static av_always_inline unsigned int opus_rc_stepmodel(OpusRangeCoder *rc, int k0)
-{
- /* Use a probability of 3 up to itheta=8192 and then use 1 after */
- unsigned int k, scale, symbol, total = (k0+1)*3 + k0;
- scale = rc->range / total;
- symbol = rc->value / scale + 1;
- symbol = total - FFMIN(symbol, total);
-
- k = (symbol < (k0+1)*3) ? symbol/3 : symbol - (k0+1)*2;
-
- opus_rc_update(rc, scale, (k <= k0) ? 3*(k+0) : (k-1-k0) + 3*(k0+1),
- (k <= k0) ? 3*(k+1) : (k-0-k0) + 3*(k0+1), total);
- return k;
-}
-
-static av_always_inline unsigned int opus_rc_trimodel(OpusRangeCoder *rc, int qn)
-{
- unsigned int k, scale, symbol, total, low, center;
-
- total = ((qn>>1) + 1) * ((qn>>1) + 1);
- scale = rc->range / total;
- center = rc->value / scale + 1;
- center = total - FFMIN(center, total);
-
- if (center < total >> 1) {
- k = (ff_sqrt(8 * center + 1) - 1) >> 1;
- low = k * (k + 1) >> 1;
- symbol = k + 1;
- } else {
- k = (2*(qn + 1) - ff_sqrt(8*(total - center - 1) + 1)) >> 1;
- low = total - ((qn + 1 - k) * (qn + 2 - k) >> 1);
- symbol = qn + 1 - k;
- }
-
- opus_rc_update(rc, scale, low, low + symbol, total);
-
- return k;
-}
-
int ff_opus_parse_packet(OpusPacket *pkt, const uint8_t *buf, int buf_size,
int self_delimited);
@@ -415,16 +191,10 @@ int ff_silk_decode_superframe(SilkContext *s, OpusRangeCoder *rc,
enum OpusBandwidth bandwidth, int coded_channels,
int duration_ms);
-int ff_celt_init(AVCodecContext *avctx, CeltContext **s, int output_channels);
-
-void ff_celt_free(CeltContext **s);
-
-void ff_celt_flush(CeltContext *s);
-
-int ff_celt_decode_frame(CeltContext *s, OpusRangeCoder *rc,
- float **output, int coded_channels, int frame_size,
- int startband, int endband);
+/* Encode or decode CELT bands */
+void ff_celt_quant_bands(CeltFrame *f, OpusRangeCoder *rc);
-extern const float ff_celt_window2[120];
+/* Encode or decode CELT bitallocation */
+void ff_celt_bitalloc(CeltFrame *f, OpusRangeCoder *rc, int encode);
#endif /* AVCODEC_OPUS_H */
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