mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-11-26 19:01:44 +02:00
134193a2ff
Both AC-3 encoder share the same options, yet they are nevertheless duplicated in the binary; and the options applying to the EAC-3 encoder are a proper subset of the options for the AC-3 encoders, so that it can use the same options as the former by putting the options specific to AC-3 at the front. This commit implements this. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
147 lines
4.3 KiB
C
147 lines
4.3 KiB
C
/*
|
|
* The simplest AC-3 encoder
|
|
* Copyright (c) 2000 Fabrice Bellard
|
|
* Copyright (c) 2006-2010 Justin Ruggles <justin.ruggles@gmail.com>
|
|
* Copyright (c) 2006-2010 Prakash Punnoor <prakash@punnoor.de>
|
|
*
|
|
* This file is part of FFmpeg.
|
|
*
|
|
* 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.
|
|
*
|
|
* 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 FFmpeg; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
/**
|
|
* @file
|
|
* fixed-point AC-3 encoder.
|
|
*/
|
|
|
|
#define AC3ENC_FLOAT 0
|
|
#define FFT_FLOAT 0
|
|
#define FFT_FIXED_32 1
|
|
#include "internal.h"
|
|
#include "audiodsp.h"
|
|
#include "ac3enc.h"
|
|
#include "eac3enc.h"
|
|
#include "kbdwin.h"
|
|
|
|
static const AVClass ac3enc_class = {
|
|
.class_name = "Fixed-Point AC-3 Encoder",
|
|
.item_name = av_default_item_name,
|
|
.option = ff_ac3_enc_options,
|
|
.version = LIBAVUTIL_VERSION_INT,
|
|
};
|
|
|
|
static void sum_square_butterfly(AC3EncodeContext *s, int64_t sum[4],
|
|
const int32_t *coef0, const int32_t *coef1,
|
|
int len)
|
|
{
|
|
s->ac3dsp.sum_square_butterfly_int32(sum, coef0, coef1, len);
|
|
}
|
|
|
|
/*
|
|
* Clip MDCT coefficients to allowable range.
|
|
*/
|
|
static void clip_coefficients(AudioDSPContext *adsp, int32_t *coef,
|
|
unsigned int len)
|
|
{
|
|
adsp->vector_clip_int32(coef, coef, COEF_MIN, COEF_MAX, len);
|
|
}
|
|
|
|
|
|
/*
|
|
* Calculate a single coupling coordinate.
|
|
*/
|
|
static CoefType calc_cpl_coord(CoefSumType energy_ch, CoefSumType energy_cpl)
|
|
{
|
|
if (energy_cpl <= COEF_MAX) {
|
|
return 1048576;
|
|
} else {
|
|
uint64_t coord = energy_ch / (energy_cpl >> 24);
|
|
uint32_t coord32 = FFMIN(coord, 1073741824);
|
|
coord32 = ff_sqrt(coord32) << 9;
|
|
return FFMIN(coord32, COEF_MAX);
|
|
}
|
|
}
|
|
|
|
|
|
#include "ac3enc_template.c"
|
|
|
|
|
|
/**
|
|
* Finalize MDCT and free allocated memory.
|
|
*
|
|
* @param s AC-3 encoder private context
|
|
*/
|
|
static av_cold void ac3_fixed_mdct_end(AC3EncodeContext *s)
|
|
{
|
|
ff_mdct_end(&s->mdct);
|
|
}
|
|
|
|
/**
|
|
* Initialize MDCT tables.
|
|
*
|
|
* @param s AC-3 encoder private context
|
|
* @return 0 on success, negative error code on failure
|
|
*/
|
|
static av_cold int ac3_fixed_mdct_init(AC3EncodeContext *s)
|
|
{
|
|
float fwin[AC3_BLOCK_SIZE];
|
|
|
|
int32_t *iwin = av_malloc_array(AC3_BLOCK_SIZE, sizeof(*iwin));
|
|
if (!iwin)
|
|
return AVERROR(ENOMEM);
|
|
|
|
ff_kbd_window_init(fwin, 5.0, AC3_BLOCK_SIZE);
|
|
for (int i = 0; i < AC3_BLOCK_SIZE; i++)
|
|
iwin[i] = lrintf(fwin[i] * (1 << 22));
|
|
|
|
s->mdct_window = iwin;
|
|
|
|
s->fdsp = avpriv_alloc_fixed_dsp(s->avctx->flags & AV_CODEC_FLAG_BITEXACT);
|
|
if (!s->fdsp)
|
|
return AVERROR(ENOMEM);
|
|
|
|
return ff_mdct_init(&s->mdct, 9, 0, -1.0);
|
|
}
|
|
|
|
|
|
static av_cold int ac3_fixed_encode_init(AVCodecContext *avctx)
|
|
{
|
|
AC3EncodeContext *s = avctx->priv_data;
|
|
s->fixed_point = 1;
|
|
s->mdct_end = ac3_fixed_mdct_end;
|
|
s->mdct_init = ac3_fixed_mdct_init;
|
|
s->allocate_sample_buffers = allocate_sample_buffers;
|
|
return ff_ac3_encode_init(avctx);
|
|
}
|
|
|
|
|
|
AVCodec ff_ac3_fixed_encoder = {
|
|
.name = "ac3_fixed",
|
|
.long_name = NULL_IF_CONFIG_SMALL("ATSC A/52A (AC-3)"),
|
|
.type = AVMEDIA_TYPE_AUDIO,
|
|
.id = AV_CODEC_ID_AC3,
|
|
.priv_data_size = sizeof(AC3EncodeContext),
|
|
.init = ac3_fixed_encode_init,
|
|
.encode2 = ff_ac3_fixed_encode_frame,
|
|
.close = ff_ac3_encode_close,
|
|
.sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S32P,
|
|
AV_SAMPLE_FMT_NONE },
|
|
.priv_class = &ac3enc_class,
|
|
.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP,
|
|
.supported_samplerates = ff_ac3_sample_rate_tab,
|
|
.channel_layouts = ff_ac3_channel_layouts,
|
|
.defaults = ff_ac3_enc_defaults,
|
|
};
|