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161 lines
6.0 KiB
161 lines
6.0 KiB
/* |
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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 "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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extern const AACDecProc aac_proc; |
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extern const AACDecProc aac_proc_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->proc = is_fixed ? aac_proc_fixed : aac_proc; |
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return ac->dsp.init(ac); |
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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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