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/*
* Common parts of the AAC decoders
* Copyright (c) 2005-2006 Oded Shimon ( ods15 ods15 dyndns org )
* Copyright (c) 2006-2007 Maxim Gavrilov ( maxim.gavrilov gmail com )
* Copyright (c) 2008-2013 Alex Converse <alex.converse@gmail.com>
*
* AAC LATM decoder
* Copyright (c) 2008-2010 Paul Kendall <paul@kcbbs.gen.nz>
* Copyright (c) 2010 Janne Grunau <janne-libav@jannau.net>
*
* AAC decoder fixed-point implementation
* Copyright (c) 2013
* MIPS Technologies, Inc., California.
*
* 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
*/
#include <limits.h>
#include <stddef.h>
#include "libavcodec/aac.h"
#include "libavcodec/aacsbr.h"
#include "libavcodec/aacdec.h"
#include "libavcodec/avcodec.h"
#include "libavutil/attributes.h"
#include "libavutil/error.h"
#include "libavutil/log.h"
#include "libavutil/macros.h"
#include "libavutil/mem.h"
#include "libavutil/opt.h"
#include "libavutil/tx.h"
#include "libavutil/version.h"
extern const AACDecDSP aac_dsp;
extern const AACDecDSP aac_dsp_fixed;
extern const AACDecProc aac_proc;
extern const AACDecProc aac_proc_fixed;
av_cold int ff_aac_decode_close(AVCodecContext *avctx)
{
AACDecContext *ac = avctx->priv_data;
int is_fixed = ac->is_fixed;
void (*sbr_close)(ChannelElement *che) = is_fixed ? RENAME_FIXED(ff_aac_sbr_ctx_close)
: ff_aac_sbr_ctx_close;
for (int type = 0; type < FF_ARRAY_ELEMS(ac->che); type++) {
for (int i = 0; i < MAX_ELEM_ID; i++) {
if (ac->che[type][i]) {
sbr_close(ac->che[type][i]);
av_freep(&ac->che[type][i]);
}
}
}
av_tx_uninit(&ac->mdct120);
av_tx_uninit(&ac->mdct128);
av_tx_uninit(&ac->mdct480);
av_tx_uninit(&ac->mdct512);
av_tx_uninit(&ac->mdct960);
av_tx_uninit(&ac->mdct1024);
av_tx_uninit(&ac->mdct_ltp);
// Compiler will optimize this branch away.
if (is_fixed)
av_freep(&ac->RENAME_FIXED(fdsp));
else
av_freep(&ac->fdsp);
return 0;
}
av_cold int ff_aac_decode_init_common(AVCodecContext *avctx)
{
AACDecContext *ac = avctx->priv_data;
int is_fixed = ac->is_fixed, ret;
float scale_fixed, scale_float;
const float *const scalep = is_fixed ? &scale_fixed : &scale_float;
enum AVTXType tx_type = is_fixed ? AV_TX_INT32_MDCT : AV_TX_FLOAT_MDCT;
if (avctx->ch_layout.nb_channels > MAX_CHANNELS) {
av_log(avctx, AV_LOG_ERROR, "Too many channels\n");
return AVERROR_INVALIDDATA;
}
ac->random_state = 0x1f2e3d4c;
#define MDCT_INIT(s, fn, len, sval) \
scale_fixed = (sval) * 128.0f; \
scale_float = (sval) / 32768.0f; \
ret = av_tx_init(&s, &fn, tx_type, 1, len, scalep, 0); \
if (ret < 0) \
return ret
MDCT_INIT(ac->mdct120, ac->mdct120_fn, 120, 1.0/120);
MDCT_INIT(ac->mdct128, ac->mdct128_fn, 128, 1.0/128);
MDCT_INIT(ac->mdct480, ac->mdct480_fn, 480, 1.0/480);
MDCT_INIT(ac->mdct512, ac->mdct512_fn, 512, 1.0/512);
MDCT_INIT(ac->mdct960, ac->mdct960_fn, 960, 1.0/960);
MDCT_INIT(ac->mdct1024, ac->mdct1024_fn, 1024, 1.0/1024);
#undef MDCT_INIT
/* LTP forward MDCT */
scale_fixed = -1.0;
scale_float = -32786.0*2 + 36;
ret = av_tx_init(&ac->mdct_ltp, &ac->mdct_ltp_fn, tx_type, 0, 1024, scalep, 0);
if (ret < 0)
return ret;
ac->dsp = is_fixed ? aac_dsp_fixed : aac_dsp;
ac->proc = is_fixed ? aac_proc_fixed : aac_proc;
return ac->dsp.init(ac);
}
#define AACDEC_FLAGS AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_AUDIO_PARAM
#define OFF(field) offsetof(AACDecContext, field)
static const AVOption options[] = {
/**
* AVOptions for Japanese DTV specific extensions (ADTS only)
*/
{"dual_mono_mode", "Select the channel to decode for dual mono",
OFF(force_dmono_mode), AV_OPT_TYPE_INT, {.i64=-1}, -1, 2,
AACDEC_FLAGS, .unit = "dual_mono_mode"},
{"auto", "autoselection", 0, AV_OPT_TYPE_CONST, {.i64=-1}, INT_MIN, INT_MAX, AACDEC_FLAGS, .unit = "dual_mono_mode"},
{"main", "Select Main/Left channel", 0, AV_OPT_TYPE_CONST, {.i64= 1}, INT_MIN, INT_MAX, AACDEC_FLAGS, .unit = "dual_mono_mode"},
{"sub" , "Select Sub/Right channel", 0, AV_OPT_TYPE_CONST, {.i64= 2}, INT_MIN, INT_MAX, AACDEC_FLAGS, .unit = "dual_mono_mode"},
{"both", "Select both channels", 0, AV_OPT_TYPE_CONST, {.i64= 0}, INT_MIN, INT_MAX, AACDEC_FLAGS, .unit = "dual_mono_mode"},
{ "channel_order", "Order in which the channels are to be exported",
OFF(output_channel_order), AV_OPT_TYPE_INT,
{ .i64 = CHANNEL_ORDER_DEFAULT }, 0, 1, AACDEC_FLAGS, .unit = "channel_order" },
{ "default", "normal libavcodec channel order", 0, AV_OPT_TYPE_CONST,
{ .i64 = CHANNEL_ORDER_DEFAULT }, .flags = AACDEC_FLAGS, .unit = "channel_order" },
{ "coded", "order in which the channels are coded in the bitstream",
0, AV_OPT_TYPE_CONST, { .i64 = CHANNEL_ORDER_CODED }, .flags = AACDEC_FLAGS, .unit = "channel_order" },
{NULL},
};
const AVClass ff_aac_decoder_class = {
.class_name = "AAC decoder",
.item_name = av_default_item_name,
.option = options,
.version = LIBAVUTIL_VERSION_INT,
};
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