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-rw-r--r--libavcodec/ac3enc_template.c33
1 files changed, 13 insertions, 20 deletions
diff --git a/libavcodec/ac3enc_template.c b/libavcodec/ac3enc_template.c
index 388d75377e..904e0bb9ef 100644
--- a/libavcodec/ac3enc_template.c
+++ b/libavcodec/ac3enc_template.c
@@ -4,20 +4,20 @@
* Copyright (c) 2006-2011 Justin Ruggles <justin.ruggles@gmail.com>
* Copyright (c) 2006-2010 Prakash Punnoor <prakash@punnoor.de>
*
- * This file is part of Libav.
+ * This file is part of FFmpeg.
*
- * Libav is free software; you can redistribute it and/or
+ * FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
- * Libav is distributed in the hope that it will be useful,
+ * FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
- * License along with Libav; if not, write to the Free Software
+ * License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
@@ -43,6 +43,9 @@ static void clip_coefficients(DSPContext *dsp, CoefType *coef, unsigned int len)
static CoefType calc_cpl_coord(CoefSumType energy_ch, CoefSumType energy_cpl);
+static void sum_square_butterfly(AC3EncodeContext *s, CoefSumType sum[4],
+ const CoefType *coef0, const CoefType *coef1,
+ int len);
int AC3_NAME(allocate_sample_buffers)(AC3EncodeContext *s)
{
@@ -66,7 +69,7 @@ alloc_fail:
/*
* Copy input samples.
- * Channels are reordered from Libav's default order to AC-3 order.
+ * Channels are reordered from FFmpeg's default order to AC-3 order.
*/
static void copy_input_samples(AC3EncodeContext *s, SampleType **samples)
{
@@ -332,7 +335,7 @@ static void apply_channel_coupling(AC3EncodeContext *s)
static void compute_rematrixing_strategy(AC3EncodeContext *s)
{
int nb_coefs;
- int blk, bnd, i;
+ int blk, bnd;
AC3Block *block, *block0;
if (s->channel_mode != AC3_CHMODE_STEREO)
@@ -360,17 +363,9 @@ static void compute_rematrixing_strategy(AC3EncodeContext *s)
/* calculate calculate sum of squared coeffs for one band in one block */
int start = ff_ac3_rematrix_band_tab[bnd];
int end = FFMIN(nb_coefs, ff_ac3_rematrix_band_tab[bnd+1]);
- CoefSumType sum[4] = {0,};
- for (i = start; i < end; i++) {
- CoefType lt = block->mdct_coef[1][i];
- CoefType rt = block->mdct_coef[2][i];
- CoefType md = lt + rt;
- CoefType sd = lt - rt;
- MAC_COEF(sum[0], lt, lt);
- MAC_COEF(sum[1], rt, rt);
- MAC_COEF(sum[2], md, md);
- MAC_COEF(sum[3], sd, sd);
- }
+ CoefSumType sum[4];
+ sum_square_butterfly(s, sum, block->mdct_coef[1] + start,
+ block->mdct_coef[2] + start, end - start);
/* compare sums to determine if rematrixing will be used for this band */
if (FFMIN(sum[2], sum[3]) < FFMIN(sum[0], sum[1]))
@@ -439,10 +434,8 @@ int AC3_NAME(encode_frame)(AVCodecContext *avctx, AVPacket *avpkt,
ff_ac3_quantize_mantissas(s);
- if ((ret = ff_alloc_packet(avpkt, s->frame_size))) {
- av_log(avctx, AV_LOG_ERROR, "Error getting output packet\n");
+ if ((ret = ff_alloc_packet2(avctx, avpkt, s->frame_size)))
return ret;
- }
ff_ac3_output_frame(s, avpkt->data);
if (frame->pts != AV_NOPTS_VALUE)