From 7e49f2a963bf9fcca2743838dfda79fa74f6b832 Mon Sep 17 00:00:00 2001 From: vitor Date: Sat, 13 Sep 2008 16:49:05 +0000 Subject: [PATCH] Simplify: use a single history buffer for gain and a single one for speech instead of having two for each in the context. git-svn-id: file:///var/local/repositories/ffmpeg/trunk@15307 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b --- libavcodec/ra288.c | 47 ++++++++++++++++++++++++---------------------- 1 file changed, 25 insertions(+), 22 deletions(-) diff --git a/libavcodec/ra288.c b/libavcodec/ra288.c index bdf245d45..86b0ea93e 100644 --- a/libavcodec/ra288.c +++ b/libavcodec/ra288.c @@ -29,18 +29,21 @@ typedef struct { 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) + /** 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) 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) float gain_rec[11]; - - float sp_block[41]; ///< four blocks of speech data (spec: STTMP) - float gain_block[10]; ///< four blocks of gain data (spec: GSTATE) } RA288Context; static av_cold int ra288_decode_init(AVCodecContext *avctx) @@ -71,9 +74,10 @@ static void decode(RA288Context *ractx, float gain, int cb_coef) int i, j; double sumsum; float sum, buffer[5]; - float *block = ractx->sp_block + 36; // current block + float *block = ractx->sp_hist + 70 + 36; // current block + float *gain_block = ractx->gain_hist + 28; - memmove(ractx->sp_block, ractx->sp_block + 5, 36*sizeof(*ractx->sp_block)); + memmove(ractx->sp_hist + 70, ractx->sp_hist + 75, 36*sizeof(*block)); for (i=0; i < 5; i++) { block[i] = 0.; @@ -84,7 +88,7 @@ static void decode(RA288Context *ractx, float gain, int cb_coef) /* block 46 of G.728 spec */ sum = 32.; for (i=0; i < 10; i++) - sum -= ractx->gain_block[9-i] * ractx->gain_lpc[i]; + sum -= gain_block[9-i] * ractx->gain_lpc[i]; /* block 47 of G.728 spec */ sum = av_clipf(sum, 0, 60); @@ -100,10 +104,9 @@ static void decode(RA288Context *ractx, float gain, int cb_coef) sum = FFMAX(sum, 1); /* shift and store */ - memmove(ractx->gain_block, ractx->gain_block + 1, - 9 * sizeof(*ractx->gain_block)); + memmove(gain_block, gain_block + 1, 9 * sizeof(*gain_block)); - ractx->gain_block[9] = 10 * log10(sum) - 32; + gain_block[9] = 10 * log10(sum) - 32; for (i=1; i < 5; i++) for (j=i-1; j >= 0; j--) @@ -128,14 +131,12 @@ static void convolve(float *tgt, const float *src, int len, int n) * @param n input length * @param non_rec number of non-recursive samples * @param out 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 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, +static void do_hybrid_window(int order, int n, int non_rec, float *out, float *hist, float *out2, const float *window) { @@ -144,10 +145,6 @@ static void do_hybrid_window(int order, int n, int non_rec, const float *in, float buffer2[order + 1]; float work[order + n + non_rec]; - /* update history */ - memmove(hist , hist + n, (order + non_rec)*sizeof(*hist)); - memcpy (hist + order + non_rec, in , n *sizeof(*hist)); - apply_window(work, window, hist, order + n + non_rec); convolve(buffer1, work + order , n , order); @@ -170,17 +167,23 @@ static void backward_filter(RA288Context *ractx) float temp1[37]; // RTMP in the spec float temp2[11]; // GPTPMP in the spec - do_hybrid_window(36, 40, 35, ractx->sp_block+1, temp1, ractx->sp_hist, + do_hybrid_window(36, 40, 35, temp1, ractx->sp_hist, ractx->sp_rec, syn_window); if (!compute_lpc_coefs(temp1, 36, ractx->sp_lpc, 0, 1, 1)) apply_window(ractx->sp_lpc, ractx->sp_lpc, syn_bw_tab, 36); - do_hybrid_window(10, 8, 20, ractx->gain_block+2, temp2, ractx->gain_hist, + do_hybrid_window(10, 8, 20, temp2, ractx->gain_hist, ractx->gain_rec, gain_window); if (!compute_lpc_coefs(temp2, 10, ractx->gain_lpc, 0, 1, 1)) apply_window(ractx->gain_lpc, ractx->gain_lpc, gain_bw_tab, 10); + + memmove(ractx->gain_hist, ractx->gain_hist + 8, + 28*sizeof(*ractx->gain_hist)); + + memmove(ractx->sp_hist , ractx->sp_hist + 40, + 70*sizeof(*ractx->sp_hist )); } static int ra288_decode_frame(AVCodecContext * avctx, void *data, @@ -211,7 +214,7 @@ static int ra288_decode_frame(AVCodecContext * avctx, void *data, decode(ractx, gain, cb_coef); for (j=0; j < 5; j++) - *(out++) = 8 * ractx->sp_block[36 + j]; + *(out++) = 8 * ractx->sp_hist[70 + 36 + j]; if ((i & 7) == 3) backward_filter(ractx); -- 2.39.2