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ac3dec: decode directly into output buffers 

Signed-off-by: Mans Rullgard <mans@mansr.com>
This commit is contained in:
Mans Rullgard 2012-09-13 19:40:03 +01:00
parent 30b3916425
commit ec5da7aee2
1 changed files with 20 additions and 7 deletions
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27
libavcodec/ac3dec.c
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@ -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;