From 1ea76064b4bc5619ee0f0314eb9c691945f057d2 Mon Sep 17 00:00:00 2001 From: Justin Ruggles Date: Sat, 14 Jul 2007 16:04:40 +0000 Subject: AC-3 decoder, soc revision 72, Sep 7 04:20:00 2006 UTC by cloud9 fix short block imdct. Originally committed as revision 9670 to svn://svn.ffmpeg.org/ffmpeg/trunk --- libavcodec/ac3dec.c | 24 +++++++++++++++++++----- 1 file changed, 19 insertions(+), 5 deletions(-) (limited to 'libavcodec') diff --git a/libavcodec/ac3dec.c b/libavcodec/ac3dec.c index 388afd4e78..b0b8bbb052 100644 --- a/libavcodec/ac3dec.c +++ b/libavcodec/ac3dec.c @@ -1609,7 +1609,8 @@ static void do_imdct_256(AC3DecodeContext *ctx, int chindex) { int k; float x1[128], x2[128]; - float *ptr; + float *o_ptr, *d_ptr, *w; + FFTComplex *ptr1, *ptr2; for (k = 0; k < N / 4; k++) { x1[k] = ctx->transform_coeffs[chindex][2 * k]; @@ -1619,10 +1620,23 @@ static void do_imdct_256(AC3DecodeContext *ctx, int chindex) ff_imdct_calc(&ctx->imdct_256, ctx->tmp_output, x1, ctx->tmp_imdct); ff_imdct_calc(&ctx->imdct_256, ctx->tmp_output + 256, x2, ctx->tmp_imdct); - ptr = ctx->output[chindex]; - ctx->dsp.vector_fmul_add_add(ptr, ctx->tmp_output, ctx->window, ctx->delay[chindex], 384, BLOCK_SIZE, 1); - ptr = ctx->delay[chindex]; - ctx->dsp.vector_fmul_reverse(ptr, ctx->tmp_output + 256, ctx->window, BLOCK_SIZE); + o_ptr = ctx->output[chindex]; + d_ptr = ctx->delay[chindex]; + ptr1 = (FFTComplex *)ctx->tmp_output; + ptr2 = (FFTComplex *)ctx->tmp_output + 256; + w = ctx->window; + + for (k = 0; k < N / 8; k++) + { + o_ptr[2 * k] = -ptr1[k].im * w[2 * k] + d_ptr[2 * k] + 384.0; + o_ptr[2 * k + 1] = ptr1[N / 8 - k - 1].re * w[2 * k + 1] + 384.0; + o_ptr[N / 4 + 2 * k] = -ptr1[k].re * w[N / 4 + 2 * k] + d_ptr[N / 4 + 2 * k] + 384.0; + o_ptr[N / 4 + 2 * k + 1] = ptr1[N / 8 - k - 1].im * w[N / 4 + 2 * k + 1] + d_ptr[N / 4 + 2 * k + 1] + 384.0; + d_ptr[2 * k] = ptr2[k].re * w[k / 2 - 2 * k - 1]; + d_ptr[2 * k + 1] = -ptr2[N / 8 - k - 1].im * w[N / 2 - 2 * k - 2]; + d_ptr[N / 4 + 2 * k] = ptr2[k].im * w[N / 4 - 2 * k - 1]; + d_ptr[N / 4 + 2 * k + 1] = -ptr2[N / 8 - k - 1].re * w[N / 4 - 2 * k - 2]; + } } /* This function performs the imdct on 512 sample transform -- cgit v1.2.3