#include "libswresample/swresample.h"
#include "avcodec.h"
-#include "get_bits.h"
+#include "opus_rc.h"
#define MAX_FRAME_SIZE 1275
#define MAX_FRAMES 48
#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
OPUS_BANDWIDTH_FULLBAND
};
-typedef struct RawBitsContext {
- const uint8_t *position;
- unsigned int bytes;
- unsigned int cachelen;
- unsigned int cacheval;
-} RawBitsContext;
-
-typedef struct OpusRangeCoder {
- GetBitContext gb;
- RawBitsContext rb;
- unsigned int range;
- unsigned int value;
- unsigned int total_read_bits;
-} OpusRangeCoder;
-
typedef struct SilkContext SilkContext;
typedef struct CeltContext CeltContext;
ChannelMap *channel_maps;
} OpusContext;
-static av_always_inline void opus_rc_normalize(OpusRangeCoder *rc)
-{
- while (rc->range <= 1<<23) {
- rc->value = ((rc->value << 8) | (get_bits(&rc->gb, 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 = av_mod_uintp2(rc->rb.cacheval, count);
- 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);
float **output, int coded_channels, int frame_size,
int startband, int endband);
-extern const float ff_celt_window2[120];
-
#endif /* AVCODEC_OPUS_H */
projects / ffmpeg / blobdiff