/*
* Real Audio 1.0 (14.4K)
- * Copyright (c) 2003 the ffmpeg project
+ *
+ * Copyright (c) 2008 Vitor Sessak
+ * Copyright (c) 2003 Nick Kurshev
+ * Based on public domain decoder at http://www.honeypot.net/audio
*
* This file is part of FFmpeg.
*
*/
#include "avcodec.h"
-#include "bitstream.h"
+#include "get_bits.h"
#include "ra144.h"
+#include "celp_filters.h"
#define NBLOCKS 4 ///< number of subblocks within a block
#define BLOCKSIZE 40 ///< subblock size in 16-bit words
unsigned int old_energy; ///< previous frame energy
unsigned int lpc_tables[2][10];
- unsigned int *lpc_coef; ///< LPC coefficients
- unsigned int *lpc_coef_old; ///< previous frame LPC coefficients
- unsigned int lpc_refl_rms;
- unsigned int lpc_refl_rms_old;
- /** the current subblock padded by the last 10 values of the previous one*/
+ /** LPC coefficients: lpc_coef[0] is the coefficients of the current frame
+ * and lpc_coef[1] of the previous one. */
+ unsigned int *lpc_coef[2];
+
+ unsigned int lpc_refl_rms[2];
+
+ /** The current subblock padded by the last 10 values of the previous one. */
int16_t curr_sblock[50];
- /** adaptive codebook. Its size is two units bigger to avoid a
- * buffer overflow */
- uint16_t adapt_cb[148];
+ /** Adaptive codebook, its size is two units bigger to avoid a
+ * buffer overflow. */
+ uint16_t adapt_cb[146+2];
} RA144Context;
-static int ra144_decode_init(AVCodecContext * avctx)
+static av_cold int ra144_decode_init(AVCodecContext * avctx)
{
RA144Context *ractx = avctx->priv_data;
- ractx->lpc_coef = ractx->lpc_tables[0];
- ractx->lpc_coef_old = ractx->lpc_tables[1];
+ ractx->lpc_coef[0] = ractx->lpc_tables[0];
+ ractx->lpc_coef[1] = ractx->lpc_tables[1];
+ avctx->sample_fmt = SAMPLE_FMT_S16;
return 0;
}
int s = 2;
while (x > 0xfff) {
s++;
- x = x >> 2;
+ x >>= 2;
}
return ff_sqrt(x << 20) << s;
int buffer[10];
int *b1 = buffer;
int *b2 = coefs;
- int x, y;
+ int i, j;
- for (x=0; x < 10; x++) {
- b1[x] = refl[x] << 4;
+ for (i=0; i < 10; i++) {
+ b1[i] = refl[i] << 4;
- for (y=0; y < x; y++)
- b1[y] = ((refl[x] * b2[x-y-1]) >> 12) + b2[y];
+ for (j=0; j < i; j++)
+ b1[j] = ((refl[i] * b2[i-j-1]) >> 12) + b2[j];
FFSWAP(int *, b1, b2);
}
- for (x=0; x < 10; x++)
- coefs[x] >>= 4;
+ for (i=0; i < 10; i++)
+ coefs[i] >>= 4;
}
/**
{
source += BUFFERSIZE - offset;
- if (offset > BLOCKSIZE) {
- memcpy(target, source, BLOCKSIZE*sizeof(*target));
- } else {
- memcpy(target, source, offset*sizeof(*target));
+ memcpy(target, source, FFMIN(BLOCKSIZE, offset)*sizeof(*target));
+ if (offset < BLOCKSIZE)
memcpy(target + offset, source, (BLOCKSIZE - offset)*sizeof(*target));
- }
}
/** inverse root mean square */
v[0] = 0;
for (i=!skip_first; i<3; i++)
- v[i] = (gain_val_tab[n][i] * m[i]) >> (gain_exp_tab[n][i] + 1);
-
- for (i=0; i < BLOCKSIZE; i++)
- dest[i] = (s1[i]*v[0] + s2[i]*v[1] + s3[i]*v[2]) >> 12;
-}
-
-/**
- * LPC Filter. Each output value is predicted from the 10 previous computed
- * ones. It overwrites the input with the output.
- *
- * @param in the input of the filter. It should be an array of size len + 10.
- * The 10 first input values are used to evaluate the first filtered one.
- */
-static void lpc_filter(uint16_t *in, const int16_t *lpc_coefs, int len)
-{
- int x, i;
- int16_t *ptr = in;
-
- for (i=0; i<len; i++) {
- int sum = 0;
- int new_val;
-
- for(x=0; x<10; x++)
- sum += lpc_coefs[9-x] * ptr[x];
+ v[i] = (gain_val_tab[n][i] * m[i]) >> gain_exp_tab[n];
- sum >>= 12;
-
- new_val = ptr[10] - sum;
-
- if (new_val < -32768 || new_val > 32767) {
- memset(in, 0, 50*sizeof(*in));
- return;
- }
-
- ptr[10] = new_val;
- ptr++;
+ if (v[0]) {
+ for (i=0; i < BLOCKSIZE; i++)
+ dest[i] = (s1[i]*v[0] + s2[i]*v[1] + s3[i]*v[2]) >> 12;
+ } else {
+ for (i=0; i < BLOCKSIZE; i++)
+ dest[i] = ( s2[i]*v[1] + s3[i]*v[2]) >> 12;
}
}
static unsigned int rms(const int *data)
{
- int x;
+ int i;
unsigned int res = 0x10000;
- int b = 0;
+ int b = 10;
- for (x=0; x<10; x++) {
- res = (((0x1000000 - data[x]*data[x]) >> 12) * res) >> 12;
+ for (i=0; i < 10; i++) {
+ res = (((0x1000000 - data[i]*data[i]) >> 12) * res) >> 12;
if (res == 0)
return 0;
}
}
- res = t_sqrt(res);
-
- res >>= (b + 10);
- return res;
+ return t_sqrt(res) >> b;
}
-static void do_output_subblock(RA144Context *ractx,
- const uint16_t *lpc_coefs, int gval,
- GetBitContext *gb)
+static void do_output_subblock(RA144Context *ractx, const uint16_t *lpc_coefs,
+ int gval, GetBitContext *gb)
{
uint16_t buffer_a[40];
uint16_t *block;
m[0] = 0;
}
- m[1] = ((cb1_base[cb1_idx] >> 4) * gval) >> 8;
- m[2] = ((cb2_base[cb2_idx] >> 4) * gval) >> 8;
+ m[1] = (cb1_base[cb1_idx] * gval) >> 8;
+ m[2] = (cb2_base[cb2_idx] * gval) >> 8;
memmove(ractx->adapt_cb, ractx->adapt_cb + BLOCKSIZE,
(BUFFERSIZE - BLOCKSIZE) * sizeof(*ractx->adapt_cb));
block = ractx->adapt_cb + BUFFERSIZE - BLOCKSIZE;
- add_wav(block, gain, cba_idx, m, buffer_a,
+ add_wav(block, gain, cba_idx, m, cba_idx? buffer_a: NULL,
cb1_vects[cb1_idx], cb2_vects[cb2_idx]);
memcpy(ractx->curr_sblock, ractx->curr_sblock + 40,
10*sizeof(*ractx->curr_sblock));
- memcpy(ractx->curr_sblock + 10, block,
- BLOCKSIZE*sizeof(*ractx->curr_sblock));
- lpc_filter(ractx->curr_sblock, lpc_coefs, BLOCKSIZE);
+ if (ff_celp_lp_synthesis_filter(ractx->curr_sblock + 10, lpc_coefs,
+ block, BLOCKSIZE, 10, 1, 0xfff))
+ memset(ractx->curr_sblock, 0, 50*sizeof(*ractx->curr_sblock));
}
static void int_to_int16(int16_t *out, const int *inp)
{
int i;
- for (i=0; i<30; i++)
- *(out++) = *(inp++);
+ for (i=0; i < 30; i++)
+ *out++ = *inp++;
}
/**
* Evaluate the reflection coefficients from the filter coefficients.
* Does the inverse of the eval_coefs() function.
*
- * @return 1 if one of the reflection coefficients is of magnitude greater than
+ * @return 1 if one of the reflection coefficients is greater than
* 4095, 0 if not.
*/
static int eval_refl(int *refl, const int16_t *coefs, RA144Context *ractx)
{
- int retval = 0;
- int b, c, i;
- unsigned int u;
+ int b, i, j;
int buffer1[10];
int buffer2[10];
int *bp1 = buffer1;
for (i=0; i < 10; i++)
buffer2[i] = coefs[i];
- u = refl[9] = bp2[9];
+ refl[9] = bp2[9];
- if (u + 0x1000 > 0x1fff) {
+ if ((unsigned) bp2[9] + 0x1000 > 0x1fff) {
av_log(ractx, AV_LOG_ERROR, "Overflow. Broken sample?\n");
return 1;
}
- for (c=8; c >= 0; c--) {
- if (u == 0x1000)
- u++;
+ for (i=8; i >= 0; i--) {
+ b = 0x1000-((bp2[i+1] * bp2[i+1]) >> 12);
- if (u == 0xfffff000)
- u--;
+ if (!b)
+ b = -2;
- b = 0x1000-((u * u) >> 12);
+ for (j=0; j <= i; j++)
+ bp1[j] = ((bp2[j] - ((refl[i+1] * bp2[i-j]) >> 12)) * (0x1000000 / b)) >> 12;
- if (b == 0)
- b++;
-
- for (u=0; u<=c; u++)
- bp1[u] = ((bp2[u] - ((refl[c+1] * bp2[c-u]) >> 12)) * (0x1000000 / b)) >> 12;
+ if ((unsigned) bp1[i] + 0x1000 > 0x1fff)
+ return 1;
- refl[c] = u = bp1[c];
-
- if ((u + 0x1000) > 0x1fff)
- retval = 1;
+ refl[i] = bp1[i];
FFSWAP(int *, bp1, bp2);
}
- return retval;
+ return 0;
}
-static int interp(RA144Context *ractx, int16_t *out, int block_num,
- int copynew, int energy)
+static int interp(RA144Context *ractx, int16_t *out, int a,
+ int copyold, int energy)
{
int work[10];
- int a = block_num + 1;
int b = NBLOCKS - a;
- int x;
+ int i;
- // Interpolate block coefficients from the this frame forth block and
- // last frame forth block
- for (x=0; x<30; x++)
- out[x] = (a * ractx->lpc_coef[x] + b * ractx->lpc_coef_old[x])>> 2;
+ // Interpolate block coefficients from the this frame's forth block and
+ // last frame's forth block.
+ for (i=0; i<30; i++)
+ out[i] = (a * ractx->lpc_coef[0][i] + b * ractx->lpc_coef[1][i])>> 2;
if (eval_refl(work, out, ractx)) {
// The interpolated coefficients are unstable, copy either new or old
- // coefficients
- if (copynew) {
- int_to_int16(out, ractx->lpc_coef);
- return rescale_rms(ractx->lpc_refl_rms, energy);
- } else {
- int_to_int16(out, ractx->lpc_coef_old);
- return rescale_rms(ractx->lpc_refl_rms_old, energy);
- }
+ // coefficients.
+ int_to_int16(out, ractx->lpc_coef[copyold]);
+ return rescale_rms(ractx->lpc_refl_rms[copyold], energy);
} else {
return rescale_rms(rms(work), energy);
}
}
-/* Uncompress one block (20 bytes -> 160*2 bytes) */
-static int ra144_decode_frame(AVCodecContext * avctx,
- void *vdata, int *data_size,
- const uint8_t * buf, int buf_size)
+/** Uncompress one block (20 bytes -> 160*2 bytes). */
+static int ra144_decode_frame(AVCodecContext * avctx, void *vdata,
+ int *data_size, AVPacket *avpkt)
{
+ const uint8_t *buf = avpkt->data;
+ int buf_size = avpkt->size;
static const uint8_t sizes[10] = {6, 5, 5, 4, 4, 3, 3, 3, 3, 2};
unsigned int refl_rms[4]; // RMS of the reflection coefficients
uint16_t block_coefs[4][30]; // LPC coefficients of each sub-block
unsigned int lpc_refl[10]; // LPC reflection coefficients of the frame
- int i, c;
+ int i, j;
int16_t *data = vdata;
unsigned int energy;
RA144Context *ractx = avctx->priv_data;
GetBitContext gb;
+ if (*data_size < 2*160)
+ return -1;
+
if(buf_size < 20) {
av_log(avctx, AV_LOG_ERROR,
"Frame too small (%d bytes). Truncated file?\n", buf_size);
init_get_bits(&gb, buf, 20 * 8);
for (i=0; i<10; i++)
- // "<< 1"? Doesn't this make one value out of two of the table useless?
- lpc_refl[i] = lpc_refl_cb[i][get_bits(&gb, sizes[i]) << 1];
+ lpc_refl[i] = lpc_refl_cb[i][get_bits(&gb, sizes[i])];
- eval_coefs(ractx->lpc_coef, lpc_refl);
- ractx->lpc_refl_rms = rms(lpc_refl);
+ eval_coefs(ractx->lpc_coef[0], lpc_refl);
+ ractx->lpc_refl_rms[0] = rms(lpc_refl);
- energy = energy_tab[get_bits(&gb, 5) << 1]; // Useless table entries?
+ energy = energy_tab[get_bits(&gb, 5)];
- refl_rms[0] = interp(ractx, block_coefs[0], 0, 0, ractx->old_energy);
- refl_rms[1] = interp(ractx, block_coefs[1], 1, energy > ractx->old_energy,
+ refl_rms[0] = interp(ractx, block_coefs[0], 1, 1, ractx->old_energy);
+ refl_rms[1] = interp(ractx, block_coefs[1], 2, energy <= ractx->old_energy,
t_sqrt(energy*ractx->old_energy) >> 12);
- refl_rms[2] = interp(ractx, block_coefs[2], 2, 1, energy);
- refl_rms[3] = rescale_rms(ractx->lpc_refl_rms, energy);
+ refl_rms[2] = interp(ractx, block_coefs[2], 3, 0, energy);
+ refl_rms[3] = rescale_rms(ractx->lpc_refl_rms[0], energy);
- int_to_int16(block_coefs[3], ractx->lpc_coef);
+ int_to_int16(block_coefs[3], ractx->lpc_coef[0]);
- for (c=0; c<4; c++) {
- do_output_subblock(ractx, block_coefs[c], refl_rms[c], &gb);
+ for (i=0; i < 4; i++) {
+ do_output_subblock(ractx, block_coefs[i], refl_rms[i], &gb);
- for (i=0; i<BLOCKSIZE; i++)
- *data++ = av_clip_int16(ractx->curr_sblock[i + 10] << 2);
+ for (j=0; j < BLOCKSIZE; j++)
+ *data++ = av_clip_int16(ractx->curr_sblock[j + 10] << 2);
}
ractx->old_energy = energy;
- ractx->lpc_refl_rms_old = ractx->lpc_refl_rms;
+ ractx->lpc_refl_rms[1] = ractx->lpc_refl_rms[0];
- FFSWAP(unsigned int *, ractx->lpc_coef_old, ractx->lpc_coef);
+ FFSWAP(unsigned int *, ractx->lpc_coef[0], ractx->lpc_coef[1]);
*data_size = 2*160;
return 20;
projects / frescor / ffmpeg.git / blobdiff