From b11d40d12e18b425bcfbf062c2509d9491d0f440 Mon Sep 17 00:00:00 2001 From: Vitor Sessak Date: Thu, 24 Sep 2009 21:24:58 +0000 Subject: Factorize duplicated code in at1_imdct_block() Originally committed as revision 20019 to svn://svn.ffmpeg.org/ffmpeg/trunk --- libavcodec/atrac1.c | 35 +++++++++++++++++------------------ 1 file changed, 17 insertions(+), 18 deletions(-) (limited to 'libavcodec/atrac1.c') diff --git a/libavcodec/atrac1.c b/libavcodec/atrac1.c index 4dfb66e66a..0b3a2449ae 100644 --- a/libavcodec/atrac1.c +++ b/libavcodec/atrac1.c @@ -108,6 +108,9 @@ static int at1_imdct_block(AT1SUCtx* su, AT1Ctx *q) unsigned int start_pos, ref_pos = 0, pos = 0; for (band_num = 0; band_num < AT1_QMF_BANDS; band_num++) { + float *prev_buf; + int j; + band_samples = samples_per_band[band_num]; log2_block_count = su->log2_block_count[band_num]; @@ -115,6 +118,7 @@ static int at1_imdct_block(AT1SUCtx* su, AT1Ctx *q) /* 4 for short mode(low/middle bands) and 8 for short mode(high band)*/ num_blocks = 1 << log2_block_count; + if (num_blocks == 1) { /* mdct block size in samples: 128 (long mode, low & mid bands), */ /* 256 (long mode, high band) and 32 (short mode, all bands) */ block_size = band_samples >> log2_block_count; @@ -124,33 +128,28 @@ static int at1_imdct_block(AT1SUCtx* su, AT1Ctx *q) if (nbits != 5 && nbits != 7 && nbits != 8) return -1; - - if (num_blocks == 1) { - /* long blocks */ - at1_imdct(q, &q->spec[pos], &su->spectrum[0][ref_pos], nbits, band_num); - pos += block_size; // move to the next mdct block in the spectrum - - /* overlap and window long blocks */ - q->dsp.vector_fmul_window(q->bands[band_num], &su->spectrum[1][ref_pos + band_samples - 16], - &su->spectrum[0][ref_pos], ff_sine_32, 0, 16); - memcpy(q->bands[band_num] + 32, &su->spectrum[0][ref_pos + 16], 240 * sizeof(float)); } else { - /* short blocks */ - float *prev_buf; + block_size = 32; + nbits = 5; + } + start_pos = 0; prev_buf = &su->spectrum[1][ref_pos + band_samples - 16]; - for (; num_blocks != 0; num_blocks--) { - at1_imdct(q, &q->spec[pos], &su->spectrum[0][ref_pos + start_pos], 5, band_num); + for (j=0; j < num_blocks; j++) { + at1_imdct(q, &q->spec[pos], &su->spectrum[0][ref_pos + start_pos], nbits, band_num); - /* overlap and window between short blocks */ + /* overlap and window */ q->dsp.vector_fmul_window(&q->bands[band_num][start_pos], prev_buf, &su->spectrum[0][ref_pos + start_pos], ff_sine_32, 0, 16); prev_buf = &su->spectrum[0][ref_pos+start_pos + 16]; - start_pos += 32; // use hardcoded block_size - pos += 32; + start_pos += block_size; + pos += block_size; } - } + + if (num_blocks == 1) + memcpy(q->bands[band_num] + 32, &su->spectrum[0][ref_pos + 16], 240 * sizeof(float)); + ref_pos += band_samples; } -- cgit v1.2.3