160 lines
5.9 KiB
C
160 lines
5.9 KiB
C
/*
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* Common parts of the AAC decoders
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* Copyright (c) 2005-2006 Oded Shimon ( ods15 ods15 dyndns org )
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* Copyright (c) 2006-2007 Maxim Gavrilov ( maxim.gavrilov gmail com )
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* Copyright (c) 2008-2013 Alex Converse <alex.converse@gmail.com>
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*
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* AAC LATM decoder
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* Copyright (c) 2008-2010 Paul Kendall <paul@kcbbs.gen.nz>
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* Copyright (c) 2010 Janne Grunau <janne-libav@jannau.net>
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*
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* AAC decoder fixed-point implementation
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* Copyright (c) 2013
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* MIPS Technologies, Inc., California.
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <limits.h>
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#include <stddef.h>
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#include "libavcodec/aac.h"
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#include "libavcodec/aacsbr.h"
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#include "libavcodec/aacdec.h"
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#include "libavcodec/avcodec.h"
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#include "libavutil/attributes.h"
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#include "libavutil/error.h"
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#include "libavutil/log.h"
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#include "libavutil/macros.h"
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#include "libavutil/mem.h"
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#include "libavutil/opt.h"
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#include "libavutil/tx.h"
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#include "libavutil/version.h"
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extern const AACDecDSP aac_dsp;
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extern const AACDecDSP aac_dsp_fixed;
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av_cold int ff_aac_decode_close(AVCodecContext *avctx)
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{
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AACDecContext *ac = avctx->priv_data;
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int is_fixed = ac->is_fixed;
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void (*sbr_close)(ChannelElement *che) = is_fixed ? RENAME_FIXED(ff_aac_sbr_ctx_close)
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: ff_aac_sbr_ctx_close;
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for (int type = 0; type < FF_ARRAY_ELEMS(ac->che); type++) {
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for (int i = 0; i < MAX_ELEM_ID; i++) {
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if (ac->che[type][i]) {
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sbr_close(ac->che[type][i]);
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av_freep(&ac->che[type][i]);
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}
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}
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}
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av_tx_uninit(&ac->mdct120);
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av_tx_uninit(&ac->mdct128);
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av_tx_uninit(&ac->mdct480);
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av_tx_uninit(&ac->mdct512);
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av_tx_uninit(&ac->mdct960);
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av_tx_uninit(&ac->mdct1024);
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av_tx_uninit(&ac->mdct_ltp);
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// Compiler will optimize this branch away.
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if (is_fixed)
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av_freep(&ac->RENAME_FIXED(fdsp));
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else
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av_freep(&ac->fdsp);
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return 0;
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}
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av_cold int ff_aac_decode_init_common(AVCodecContext *avctx)
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{
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AACDecContext *ac = avctx->priv_data;
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int is_fixed = ac->is_fixed, ret;
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float scale_fixed, scale_float;
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const float *const scalep = is_fixed ? &scale_fixed : &scale_float;
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enum AVTXType tx_type = is_fixed ? AV_TX_INT32_MDCT : AV_TX_FLOAT_MDCT;
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if (avctx->ch_layout.nb_channels > MAX_CHANNELS) {
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av_log(avctx, AV_LOG_ERROR, "Too many channels\n");
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return AVERROR_INVALIDDATA;
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}
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ac->random_state = 0x1f2e3d4c;
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#define MDCT_INIT(s, fn, len, sval) \
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scale_fixed = (sval) * 128.0f; \
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scale_float = (sval) / 32768.0f; \
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ret = av_tx_init(&s, &fn, tx_type, 1, len, scalep, 0); \
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if (ret < 0) \
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return ret
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MDCT_INIT(ac->mdct120, ac->mdct120_fn, 120, 1.0/120);
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MDCT_INIT(ac->mdct128, ac->mdct128_fn, 128, 1.0/128);
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MDCT_INIT(ac->mdct480, ac->mdct480_fn, 480, 1.0/480);
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MDCT_INIT(ac->mdct512, ac->mdct512_fn, 512, 1.0/512);
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MDCT_INIT(ac->mdct960, ac->mdct960_fn, 960, 1.0/960);
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MDCT_INIT(ac->mdct1024, ac->mdct1024_fn, 1024, 1.0/1024);
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#undef MDCT_INIT
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/* LTP forward MDCT */
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scale_fixed = -1.0;
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scale_float = -32786.0*2 + 36;
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ret = av_tx_init(&ac->mdct_ltp, &ac->mdct_ltp_fn, tx_type, 0, 1024, scalep, 0);
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if (ret < 0)
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return ret;
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ac->dsp = is_fixed ? aac_dsp_fixed : aac_dsp;
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ac->dsp.init_tables();
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return 0;
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}
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#define AACDEC_FLAGS AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_AUDIO_PARAM
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#define OFF(field) offsetof(AACDecContext, field)
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static const AVOption options[] = {
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/**
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* AVOptions for Japanese DTV specific extensions (ADTS only)
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*/
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{"dual_mono_mode", "Select the channel to decode for dual mono",
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OFF(force_dmono_mode), AV_OPT_TYPE_INT, {.i64=-1}, -1, 2,
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AACDEC_FLAGS, .unit = "dual_mono_mode"},
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{"auto", "autoselection", 0, AV_OPT_TYPE_CONST, {.i64=-1}, INT_MIN, INT_MAX, AACDEC_FLAGS, .unit = "dual_mono_mode"},
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{"main", "Select Main/Left channel", 0, AV_OPT_TYPE_CONST, {.i64= 1}, INT_MIN, INT_MAX, AACDEC_FLAGS, .unit = "dual_mono_mode"},
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{"sub" , "Select Sub/Right channel", 0, AV_OPT_TYPE_CONST, {.i64= 2}, INT_MIN, INT_MAX, AACDEC_FLAGS, .unit = "dual_mono_mode"},
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{"both", "Select both channels", 0, AV_OPT_TYPE_CONST, {.i64= 0}, INT_MIN, INT_MAX, AACDEC_FLAGS, .unit = "dual_mono_mode"},
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{ "channel_order", "Order in which the channels are to be exported",
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OFF(output_channel_order), AV_OPT_TYPE_INT,
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{ .i64 = CHANNEL_ORDER_DEFAULT }, 0, 1, AACDEC_FLAGS, .unit = "channel_order" },
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{ "default", "normal libavcodec channel order", 0, AV_OPT_TYPE_CONST,
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{ .i64 = CHANNEL_ORDER_DEFAULT }, .flags = AACDEC_FLAGS, .unit = "channel_order" },
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{ "coded", "order in which the channels are coded in the bitstream",
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0, AV_OPT_TYPE_CONST, { .i64 = CHANNEL_ORDER_CODED }, .flags = AACDEC_FLAGS, .unit = "channel_order" },
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{NULL},
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};
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const AVClass ff_aac_decoder_class = {
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.class_name = "AAC decoder",
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.item_name = av_default_item_name,
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.option = options,
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.version = LIBAVUTIL_VERSION_INT,
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};
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