#include "ra288.h"
typedef struct {
- float sp_lpc[36]; ///< LPC coefficients for speech data (spec: A)
- float gain_lpc[10]; ///< LPC coefficients for gain (spec: GB)
- int phase;
+ float sp_lpc[36]; ///< LPC coefficients for speech data (spec: A)
+ float gain_lpc[10]; ///< LPC coefficients for gain (spec: GB)
- float sp_hist[111]; ///< Speech data history (spec: SB)
+ float sp_hist[111]; ///< Speech data history (spec: SB)
/** Speech part of the gain autocorrelation (spec: REXP) */
float sp_rec[37];
/** Recursive part of the gain autocorrelation (spec: REXPLG) */
float gain_rec[11];
- float sb[41];
- float lhist[10];
+ float sp_block[41]; ///< Speech data of four blocks (spec: STTMP)
+ float gain_block[10]; ///< Gain data of four blocks (spec: GSTATE)
} RA288Context;
+static av_cold int ra288_decode_init(AVCodecContext *avctx)
+{
+ avctx->sample_fmt = SAMPLE_FMT_S16;
+ return 0;
+}
+
static inline float scalar_product_float(const float * v1, const float * v2,
int size)
{
static void decode(RA288Context *ractx, float gain, int cb_coef)
{
- int x, y;
+ int i, j;
double sumsum;
float sum, buffer[5];
+ float *block = ractx->sp_block + 36; // Current block
- memmove(ractx->sb + 5, ractx->sb, 36 * sizeof(*ractx->sb));
+ memmove(ractx->sp_block, ractx->sp_block + 5, 36*sizeof(*ractx->sp_block));
- for (x=4; x >= 0; x--)
- ractx->sb[x] = -scalar_product_float(ractx->sb + x + 1,
- ractx->sp_lpc, 36);
+ for (i=0; i < 5; i++) {
+ block[i] = 0.;
+ for (j=0; j < 36; j++)
+ block[i] -= block[i-1-j]*ractx->sp_lpc[j];
+ }
/* block 46 of G.728 spec */
- sum = 32. - scalar_product_float(ractx->gain_lpc, ractx->lhist, 10);
+ sum = 32.;
+ for (i=0; i < 10; i++)
+ sum -= ractx->gain_block[9-i] * ractx->gain_lpc[i];
/* block 47 of G.728 spec */
sum = av_clipf(sum, 0, 60);
/* block 48 of G.728 spec */
- sumsum = exp(sum * 0.1151292546497) * gain; /* pow(10.0,sum/20)*f */
+ sumsum = exp(sum * 0.1151292546497) * gain; /* pow(10.0,sum/20)*gain */
- for (x=0; x < 5; x++)
- buffer[x] = codetable[cb_coef][x] * sumsum;
+ for (i=0; i < 5; i++)
+ buffer[i] = codetable[cb_coef][i] * sumsum;
sum = scalar_product_float(buffer, buffer, 5) / 5;
sum = FFMAX(sum, 1);
/* shift and store */
- memmove(ractx->lhist, ractx->lhist - 1, 10 * sizeof(*ractx->lhist));
+ memmove(ractx->gain_block, ractx->gain_block + 1,
+ 9 * sizeof(*ractx->gain_block));
- *ractx->lhist = 10 * log10(sum) - 32;
+ ractx->gain_block[9] = 10 * log10(sum) - 32;
- for (x=1; x < 5; x++)
- for (y=x-1; y >= 0; y--)
- buffer[x] -= ractx->sp_lpc[x-y-1] * buffer[y];
+ for (i=1; i < 5; i++)
+ for (j=i-1; j >= 0; j--)
+ buffer[i] -= ractx->sp_lpc[i-j-1] * buffer[j];
/* output */
- for (x=0; x < 5; x++)
- ractx->sb[4-x] = av_clipf(ractx->sb[4-x] + buffer[x], -4095, 4095);
+ for (i=0; i < 5; i++)
+ block[i] = av_clipf(block[i] + buffer[i], -4095, 4095);
}
/**
*/
static int eval_lpc_coeffs(const float *in, float *tgt, int n)
{
- int x, y;
+ int i, j;
double f0, f1, f2;
if (in[n] == 0)
in--; // To avoid a -1 subtraction in the inner loop
- for (x=1; x <= n; x++) {
- f1 = in[x+1];
+ for (i=1; i <= n; i++) {
+ f1 = in[i+1];
- for (y=0; y < x - 1; y++)
- f1 += in[x-y]*tgt[y];
+ for (j=0; j < i - 1; j++)
+ f1 += in[i-j]*tgt[j];
- tgt[x-1] = f2 = -f1/f0;
- for (y=0; y < x >> 1; y++) {
- float temp = tgt[y] + tgt[x-y-2]*f2;
- tgt[x-y-2] += tgt[y]*f2;
- tgt[y] = temp;
+ tgt[i-1] = f2 = -f1/f0;
+ for (j=0; j < i >> 1; j++) {
+ float temp = tgt[j] + tgt[i-j-2]*f2;
+ tgt[i-j-2] += tgt[j]*f2;
+ tgt[j] = temp;
}
if ((f0 += f1*f2) < 0)
return -1;
return 0;
}
-static void prodsum(float *tgt, const float *src, int len, int n)
+static void convolve(float *tgt, const float *src, int len, int n)
{
for (; n >= 0; n--)
tgt[n] = scalar_product_float(src, src - n, len);
/**
* Hybrid window filtering. See blocks 36 and 49 of the G.728 specification.
*
- * @note This function is slightly different from that described in the spec.
- * It expects in[0] to be the newest sample and in[n-1] to be the oldest
- * one stored. The spec has in the more ordinary way (in[0] the oldest
- * and in[n-1] the newest).
- *
* @param order the order of the filter
* @param n the length of the input
* @param non_rec the number of non-recursive samples
float *out, float *hist, float *out2,
const float *window)
{
- unsigned int x;
- float buffer1[37];
- float buffer2[37];
- float work[111];
+ int i;
+ float buffer1[order + 1];
+ float buffer2[order + 1];
+ float work[order + n + non_rec];
/* update history */
- memmove(hist, hist + n, (order + non_rec)*sizeof(*hist));
-
- for (x=0; x < n; x++)
- hist[order + non_rec + x] = in[n-x-1];
+ memmove(hist , hist + n, (order + non_rec)*sizeof(*hist));
+ memcpy (hist + order + non_rec, in , n *sizeof(*hist));
colmult(work, window, hist, order + n + non_rec);
- prodsum(buffer1, work + order , n , order);
- prodsum(buffer2, work + order + n, non_rec, order);
+ convolve(buffer1, work + order , n , order);
+ convolve(buffer2, work + order + n, non_rec, order);
- for (x=0; x <= order; x++) {
- out2[x] = out2[x] * 0.5625 + buffer1[x];
- out [x] = out2[x] + buffer2[x];
+ for (i=0; i <= order; i++) {
+ out2[i] = out2[i] * 0.5625 + buffer1[i];
+ out [i] = out2[i] + buffer2[i];
}
/* Multiply by the white noise correcting factor (WNCF) */
float temp1[37]; // RTMP in the spec
float temp2[11]; // GPTPMP in the spec
- do_hybrid_window(36, 40, 35, ractx->sb, temp1, ractx->sp_hist,
+ do_hybrid_window(36, 40, 35, ractx->sp_block+1, temp1, ractx->sp_hist,
ractx->sp_rec, syn_window);
if (!eval_lpc_coeffs(temp1, ractx->sp_lpc, 36))
colmult(ractx->sp_lpc, ractx->sp_lpc, syn_bw_tab, 36);
- do_hybrid_window(10, 8, 20, ractx->lhist, temp2, ractx->gain_hist,
+ do_hybrid_window(10, 8, 20, ractx->gain_block+2, temp2, ractx->gain_hist,
ractx->gain_rec, gain_window);
if (!eval_lpc_coeffs(temp2, ractx->gain_lpc, 10))
int buf_size)
{
int16_t *out = data;
- int x, y;
+ int i, j;
RA288Context *ractx = avctx->priv_data;
GetBitContext gb;
return 0;
}
+ if (*data_size < 32*5*2)
+ return -1;
+
init_get_bits(&gb, buf, avctx->block_align * 8);
- for (x=0; x < 32; x++) {
+ for (i=0; i < 32; i++) {
float gain = amptable[get_bits(&gb, 3)];
- int cb_coef = get_bits(&gb, 6 + (x&1));
- ractx->phase = (x + 4) & 7;
+ int cb_coef = get_bits(&gb, 6 + (i&1));
+
decode(ractx, gain, cb_coef);
- for (y=0; y < 5; y++)
- *(out++) = 8 * ractx->sb[4 - y];
+ for (j=0; j < 5; j++)
+ *(out++) = 8 * ractx->sp_block[36 + j];
- if (ractx->phase == 7)
+ if ((i & 7) == 3)
backward_filter(ractx);
}
CODEC_TYPE_AUDIO,
CODEC_ID_RA_288,
sizeof(RA288Context),
- NULL,
+ ra288_decode_init,
NULL,
NULL,
ra288_decode_frame,
projects / ffmpeg / blobdiff