From ec5da7aee277e3e5265a632cd4e932e3d5487de7 Mon Sep 17 00:00:00 2001 From: Mans Rullgard Date: Thu, 13 Sep 2012 19:40:03 +0100 Subject: ac3dec: decode directly into output buffers Signed-off-by: Mans Rullgard --- libavcodec/ac3dec.c | 27 ++++++++++++++++++++------- 1 file changed, 20 insertions(+), 7 deletions(-) (limited to 'libavcodec/ac3dec.c') diff --git a/libavcodec/ac3dec.c b/libavcodec/ac3dec.c index fe709defa9..acefe41644 100644 --- a/libavcodec/ac3dec.c +++ b/libavcodec/ac3dec.c @@ -188,7 +188,6 @@ static av_cold int ac3_decode_init(AVCodecContext *avctx) avctx->coded_frame = &s->frame; for (i = 0; i < AC3_MAX_CHANNELS; i++) { - s->outptr[i] = s->output[i]; s->xcfptr[i] = s->transform_coeffs[i]; s->dlyptr[i] = s->delay[i]; } @@ -607,14 +606,14 @@ static inline void do_imdct(AC3DecodeContext *s, int channels) for (i = 0; i < 128; i++) x[i] = s->transform_coeffs[ch][2 * i]; s->imdct_256.imdct_half(&s->imdct_256, s->tmp_output, x); - s->dsp.vector_fmul_window(s->output[ch - 1], s->delay[ch - 1], + s->dsp.vector_fmul_window(s->outptr[ch - 1], s->delay[ch - 1], s->tmp_output, s->window, 128); for (i = 0; i < 128; i++) x[i] = s->transform_coeffs[ch][2 * i + 1]; s->imdct_256.imdct_half(&s->imdct_256, s->delay[ch - 1], x); } else { s->imdct_512.imdct_half(&s->imdct_512, s->tmp_output, s->transform_coeffs[ch]); - s->dsp.vector_fmul_window(s->output[ch - 1], s->delay[ch - 1], + s->dsp.vector_fmul_window(s->outptr[ch - 1], s->delay[ch - 1], s->tmp_output, s->window, 128); memcpy(s->delay[ch - 1], s->tmp_output + 128, 128 * sizeof(float)); } @@ -1377,17 +1376,31 @@ static int ac3_decode_frame(AVCodecContext * avctx, void *data, /* decode the audio blocks */ channel_map = ff_ac3_dec_channel_map[s->output_mode & ~AC3_OUTPUT_LFEON][s->lfe_on]; - for (ch = 0; ch < s->out_channels; ch++) - output[ch] = s->output[channel_map[ch]]; + for (ch = 0; ch < s->channels; ch++) { + if (ch < s->out_channels) + s->outptr[channel_map[ch]] = (float *)s->frame.data[ch]; + else + s->outptr[ch] = s->output[ch]; + output[ch] = s->output[ch]; + } for (blk = 0; blk < s->num_blocks; blk++) { if (!err && decode_audio_block(s, blk)) { av_log(avctx, AV_LOG_ERROR, "error decoding the audio block\n"); err = 1; } - for (ch = 0; ch < s->out_channels; ch++) - memcpy(s->frame.data[ch] + blk * 1024, output[ch], 1024); + if (err) + for (ch = 0; ch < s->out_channels; ch++) + memcpy(s->outptr[channel_map[ch]], output[ch], 1024); + for (ch = 0; ch < s->out_channels; ch++) { + output[ch] = s->outptr[channel_map[ch]]; + s->outptr[channel_map[ch]] += AC3_BLOCK_SIZE; + } } + /* keep last block for error concealment in next frame */ + for (ch = 0; ch < s->out_channels; ch++) + memcpy(s->output[ch], output[ch], 1024); + *got_frame_ptr = 1; *(AVFrame *)data = s->frame; -- cgit v1.2.3