X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=libavcodec%2Fra288.c;h=64d765cecd4aeed7c9d6ab0c5cf3008d39894bfa;hb=ccfa626db863b6019fd4c316d19d8f7018543bed;hp=16bb5656cc51f21954ddbfbf1262010e7f1dc795;hpb=6509507fad19f1b2218b83b7b1a2d4ed51c42753;p=ffmpeg diff --git a/libavcodec/ra288.c b/libavcodec/ra288.c index 16bb5656cc5..64d765cecd4 100644 --- a/libavcodec/ra288.c +++ b/libavcodec/ra288.c @@ -2,228 +2,170 @@ * RealAudio 2.0 (28.8K) * Copyright (c) 2003 the ffmpeg project * - * This file is part of FFmpeg. + * This file is part of Libav. * - * FFmpeg is free software; you can redistribute it and/or + * Libav 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. * - * FFmpeg is distributed in the hope that it will be useful, + * Libav 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 FFmpeg; if not, write to the Free Software + * License along with Libav; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include "avcodec.h" #define ALT_BITSTREAM_READER_LE -#include "bitstream.h" +#include "get_bits.h" #include "ra288.h" +#include "lpc.h" +#include "celp_math.h" +#include "celp_filters.h" + +#define MAX_BACKWARD_FILTER_ORDER 36 +#define MAX_BACKWARD_FILTER_LEN 40 +#define MAX_BACKWARD_FILTER_NONREC 35 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 gain_lpc[10]; ///< LPC coefficients for gain (spec: GB) - float sp_hist[111]; ///< Speech data history (spec: SB) + /** speech data history (spec: SB). + * Its first 70 coefficients are updated only at backward filtering. + */ + float sp_hist[111]; - /** Speech part of the gain autocorrelation (spec: REXP) */ + /// speech part of the gain autocorrelation (spec: REXP) float sp_rec[37]; - float gain_hist[38]; ///< Log-gain history (spec: SBLG) + /** log-gain history (spec: SBLG). + * Its first 28 coefficients are updated only at backward filtering. + */ + float gain_hist[38]; - /** Recursive part of the gain autocorrelation (spec: REXPLG) */ + /// recursive part of the gain autocorrelation (spec: REXPLG) float gain_rec[11]; - - float sp_block[41]; ///< Speech data of four blocks (spec: STTMP) - float gain_block[10]; ///< Gain data of four blocks (spec: GSTATE) } RA288Context; -static inline float scalar_product_float(const float * v1, const float * v2, - int size) +static av_cold int ra288_decode_init(AVCodecContext *avctx) { - float res = 0.; - - while (size--) - res += *v1++ * *v2++; - - return res; + avctx->sample_fmt = AV_SAMPLE_FMT_FLT; + return 0; } -static void colmult(float *tgt, const float *m1, const float *m2, int n) +static void apply_window(float *tgt, const float *m1, const float *m2, int n) { while (n--) *tgt++ = *m1++ * *m2++; } +static void convolve(float *tgt, const float *src, int len, int n) +{ + for (; n >= 0; n--) + tgt[n] = ff_dot_productf(src, src - n, len); + +} + static void decode(RA288Context *ractx, float gain, int cb_coef) { - int x, y; + int i; double sumsum; float sum, buffer[5]; + float *block = ractx->sp_hist + 70 + 36; // current block + float *gain_block = ractx->gain_hist + 28; - memmove(ractx->sp_block + 5, ractx->sp_block, 36*sizeof(*ractx->sp_block)); - - for (x=4; x >= 0; x--) - ractx->sp_block[x] = -scalar_product_float(ractx->sp_block + x + 1, - ractx->sp_lpc, 36); + memmove(ractx->sp_hist + 70, ractx->sp_hist + 75, 36*sizeof(*block)); /* block 46 of G.728 spec */ - sum = 32. - scalar_product_float(ractx->gain_lpc, ractx->gain_block, 10); + sum = 32.; + for (i=0; i < 10; i++) + sum -= 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 */ + /* exp(sum * 0.1151292546497) == pow(10.0,sum/20) */ + sumsum = exp(sum * 0.1151292546497) * gain * (1.0/(1<<23)); - 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 = ff_dot_productf(buffer, buffer, 5) * ((1<<24)/5.); sum = FFMAX(sum, 1); /* shift and store */ - memmove(ractx->gain_block, ractx->gain_block - 1, - 10 * sizeof(*ractx->gain_block)); - - *ractx->gain_block = 10 * log10(sum) - 32; + memmove(gain_block, gain_block + 1, 9 * sizeof(*gain_block)); - for (x=1; x < 5; x++) - for (y=x-1; y >= 0; y--) - buffer[x] -= ractx->sp_lpc[x-y-1] * buffer[y]; + gain_block[9] = 10 * log10(sum) - 32; - /* output */ - for (x=0; x < 5; x++) - ractx->sp_block[4-x] = - av_clipf(ractx->sp_block[4-x] + buffer[x], -4095, 4095); + ff_celp_lp_synthesis_filterf(block, ractx->sp_lpc, buffer, 5, 36); } /** - * Converts autocorrelation coefficients to LPC coefficients using the - * Levinson-Durbin algorithm. See blocks 37 and 50 of the G.728 specification. + * Hybrid window filtering, see blocks 36 and 49 of the G.728 specification. * - * @return 0 if success, -1 if fail - */ -static int eval_lpc_coeffs(const float *in, float *tgt, int n) -{ - int x, y; - double f0, f1, f2; - - if (in[n] == 0) - return -1; - - if ((f0 = *in) <= 0) - return -1; - - in--; // To avoid a -1 subtraction in the inner loop - - for (x=1; x <= n; x++) { - f1 = in[x+1]; - - for (y=0; y < x - 1; y++) - f1 += in[x-y]*tgt[y]; - - 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; - } - if ((f0 += f1*f2) < 0) - return -1; - } - - return 0; -} - -static void prodsum(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 - * @param out the filter output - * @param in pointer to the input of the filter - * @param hist pointer to the input history of the filter. It is updated by - * this function. + * @param order filter order + * @param n input length + * @param non_rec number of non-recursive samples + * @param out filter output + * @param hist pointer to the input history of the filter * @param out pointer to the non-recursive part of the output * @param out2 pointer to the recursive part of the output * @param window pointer to the windowing function table */ -static void do_hybrid_window(int order, int n, int non_rec, const float *in, - float *out, float *hist, float *out2, - const float *window) +static void do_hybrid_window(int order, int n, int non_rec, float *out, + float *hist, float *out2, const float *window) { - unsigned int x; - 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)); + int i; + float buffer1[MAX_BACKWARD_FILTER_ORDER + 1]; + float buffer2[MAX_BACKWARD_FILTER_ORDER + 1]; + float work[MAX_BACKWARD_FILTER_ORDER + MAX_BACKWARD_FILTER_LEN + MAX_BACKWARD_FILTER_NONREC]; - for (x=0; x < n; x++) - hist[order + non_rec + x] = in[n-x-1]; + apply_window(work, window, hist, order + n + non_rec); - colmult(work, window, hist, order + n + non_rec); + convolve(buffer1, work + order , n , order); + convolve(buffer2, work + order + n, non_rec, order); - prodsum(buffer1, work + order , n , order); - prodsum(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) */ + /* Multiply by the white noise correcting factor (WNCF). */ *out *= 257./256.; } /** - * Backward synthesis filter. Find the LPC coefficients from past speech data. + * Backward synthesis filter, find the LPC coefficients from past speech data. */ -static void backward_filter(RA288Context *ractx) +static void backward_filter(float *hist, float *rec, const float *window, + float *lpc, const float *tab, + int order, int n, int non_rec, int move_size) { - float temp1[37]; // RTMP in the spec - float temp2[11]; // GPTPMP in the spec - - do_hybrid_window(36, 40, 35, ractx->sp_block, temp1, ractx->sp_hist, - ractx->sp_rec, syn_window); + float temp[MAX_BACKWARD_FILTER_ORDER+1]; - if (!eval_lpc_coeffs(temp1, ractx->sp_lpc, 36)) - colmult(ractx->sp_lpc, ractx->sp_lpc, syn_bw_tab, 36); + do_hybrid_window(order, n, non_rec, temp, hist, rec, window); - do_hybrid_window(10, 8, 20, ractx->gain_block, temp2, ractx->gain_hist, - ractx->gain_rec, gain_window); + if (!compute_lpc_coefs(temp, order, lpc, 0, 1, 1)) + apply_window(lpc, lpc, tab, order); - if (!eval_lpc_coeffs(temp2, ractx->gain_lpc, 10)) - colmult(ractx->gain_lpc, ractx->gain_lpc, gain_bw_tab, 10); + memmove(hist, hist + n, move_size*sizeof(*hist)); } static int ra288_decode_frame(AVCodecContext * avctx, void *data, - int *data_size, const uint8_t * buf, - int buf_size) + int *data_size, AVPacket *avpkt) { - int16_t *out = data; - int x, y; + const uint8_t *buf = avpkt->data; + int buf_size = avpkt->size; + float *out = data; + int i, j; RA288Context *ractx = avctx->priv_data; GetBitContext gb; @@ -234,32 +176,40 @@ static int ra288_decode_frame(AVCodecContext * avctx, void *data, return 0; } + if (*data_size < 32*5*4) + 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->sp_block[4 - y]; + for (j=0; j < 5; j++) + *(out++) = ractx->sp_hist[70 + 36 + j]; + + if ((i & 7) == 3) { + backward_filter(ractx->sp_hist, ractx->sp_rec, syn_window, + ractx->sp_lpc, syn_bw_tab, 36, 40, 35, 70); - if (ractx->phase == 7) - backward_filter(ractx); + backward_filter(ractx->gain_hist, ractx->gain_rec, gain_window, + ractx->gain_lpc, gain_bw_tab, 10, 8, 20, 28); + } } *data_size = (char *)out - (char *)data; return avctx->block_align; } -AVCodec ra_288_decoder = +AVCodec ff_ra_288_decoder = { "real_288", - CODEC_TYPE_AUDIO, + AVMEDIA_TYPE_AUDIO, CODEC_ID_RA_288, sizeof(RA288Context), - NULL, + ra288_decode_init, NULL, NULL, ra288_decode_frame,