414 lines
16 KiB
C
414 lines
16 KiB
C
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/*
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* ATRAC3+ compatible decoder
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*
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* Copyright (c) 2010-2013 Maxim Poliakovski
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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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/**
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* @file
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* Sony ATRAC3+ compatible decoder.
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*
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* Container formats used to store its data:
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* RIFF WAV (.at3) and Sony OpenMG (.oma, .aa3).
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*
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* Technical description of this codec can be found here:
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* http://wiki.multimedia.cx/index.php?title=ATRAC3plus
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*
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* Kudos to Benjamin Larsson and Michael Karcher
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* for their precious technical help!
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*/
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#include <stdint.h>
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#include <string.h>
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#include "libavutil/channel_layout.h"
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#include "libavutil/float_dsp.h"
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#include "avcodec.h"
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#include "get_bits.h"
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#include "internal.h"
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#include "atrac.h"
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#include "atrac3plus.h"
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typedef struct ATRAC3PContext {
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GetBitContext gb;
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AVFloatDSPContext *fdsp;
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DECLARE_ALIGNED(32, float, samples)[2][ATRAC3P_FRAME_SAMPLES]; ///< quantized MDCT spectrum
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DECLARE_ALIGNED(32, float, mdct_buf)[2][ATRAC3P_FRAME_SAMPLES]; ///< output of the IMDCT
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DECLARE_ALIGNED(32, float, time_buf)[2][ATRAC3P_FRAME_SAMPLES]; ///< output of the gain compensation
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DECLARE_ALIGNED(32, float, outp_buf)[2][ATRAC3P_FRAME_SAMPLES];
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AtracGCContext gainc_ctx; ///< gain compensation context
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FFTContext mdct_ctx;
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FFTContext ipqf_dct_ctx; ///< IDCT context used by IPQF
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Atrac3pChanUnitCtx *ch_units; ///< global channel units
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int num_channel_blocks; ///< number of channel blocks
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uint8_t channel_blocks[5]; ///< channel configuration descriptor
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uint64_t my_channel_layout; ///< current channel layout
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} ATRAC3PContext;
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static av_cold int atrac3p_decode_close(AVCodecContext *avctx)
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{
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ATRAC3PContext *ctx = avctx->priv_data;
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av_freep(&ctx->ch_units);
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av_freep(&ctx->fdsp);
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ff_mdct_end(&ctx->mdct_ctx);
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ff_mdct_end(&ctx->ipqf_dct_ctx);
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return 0;
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}
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static av_cold int set_channel_params(ATRAC3PContext *ctx,
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AVCodecContext *avctx)
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{
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memset(ctx->channel_blocks, 0, sizeof(ctx->channel_blocks));
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switch (avctx->channels) {
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case 1:
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if (avctx->channel_layout != AV_CH_FRONT_LEFT)
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avctx->channel_layout = AV_CH_LAYOUT_MONO;
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ctx->num_channel_blocks = 1;
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ctx->channel_blocks[0] = CH_UNIT_MONO;
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break;
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case 2:
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avctx->channel_layout = AV_CH_LAYOUT_STEREO;
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ctx->num_channel_blocks = 1;
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ctx->channel_blocks[0] = CH_UNIT_STEREO;
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break;
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case 3:
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avctx->channel_layout = AV_CH_LAYOUT_SURROUND;
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ctx->num_channel_blocks = 2;
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ctx->channel_blocks[0] = CH_UNIT_STEREO;
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ctx->channel_blocks[1] = CH_UNIT_MONO;
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break;
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case 4:
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avctx->channel_layout = AV_CH_LAYOUT_4POINT0;
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ctx->num_channel_blocks = 3;
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ctx->channel_blocks[0] = CH_UNIT_STEREO;
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ctx->channel_blocks[1] = CH_UNIT_MONO;
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ctx->channel_blocks[2] = CH_UNIT_MONO;
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break;
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case 6:
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avctx->channel_layout = AV_CH_LAYOUT_5POINT1_BACK;
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ctx->num_channel_blocks = 4;
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ctx->channel_blocks[0] = CH_UNIT_STEREO;
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ctx->channel_blocks[1] = CH_UNIT_MONO;
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ctx->channel_blocks[2] = CH_UNIT_STEREO;
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ctx->channel_blocks[3] = CH_UNIT_MONO;
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break;
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case 7:
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avctx->channel_layout = AV_CH_LAYOUT_6POINT1_BACK;
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ctx->num_channel_blocks = 5;
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ctx->channel_blocks[0] = CH_UNIT_STEREO;
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ctx->channel_blocks[1] = CH_UNIT_MONO;
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ctx->channel_blocks[2] = CH_UNIT_STEREO;
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ctx->channel_blocks[3] = CH_UNIT_MONO;
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ctx->channel_blocks[4] = CH_UNIT_MONO;
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break;
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case 8:
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avctx->channel_layout = AV_CH_LAYOUT_7POINT1;
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ctx->num_channel_blocks = 5;
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ctx->channel_blocks[0] = CH_UNIT_STEREO;
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ctx->channel_blocks[1] = CH_UNIT_MONO;
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ctx->channel_blocks[2] = CH_UNIT_STEREO;
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ctx->channel_blocks[3] = CH_UNIT_STEREO;
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ctx->channel_blocks[4] = CH_UNIT_MONO;
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break;
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default:
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av_log(avctx, AV_LOG_ERROR,
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"Unsupported channel count: %d!\n", avctx->channels);
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return AVERROR_INVALIDDATA;
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}
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return 0;
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}
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static av_cold int atrac3p_decode_init(AVCodecContext *avctx)
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{
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ATRAC3PContext *ctx = avctx->priv_data;
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int i, ch, ret;
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if (!avctx->block_align) {
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av_log(avctx, AV_LOG_ERROR, "block_align is not set\n");
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return AVERROR(EINVAL);
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}
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ff_atrac3p_init_vlcs();
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/* initialize IPQF */
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ff_mdct_init(&ctx->ipqf_dct_ctx, 5, 1, 32.0 / 32768.0);
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ff_atrac3p_init_imdct(avctx, &ctx->mdct_ctx);
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ff_atrac_init_gain_compensation(&ctx->gainc_ctx, 6, 2);
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ff_atrac3p_init_wave_synth();
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if ((ret = set_channel_params(ctx, avctx)) < 0)
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return ret;
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ctx->my_channel_layout = avctx->channel_layout;
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ctx->ch_units = av_mallocz_array(ctx->num_channel_blocks, sizeof(*ctx->ch_units));
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ctx->fdsp = avpriv_float_dsp_alloc(avctx->flags & AV_CODEC_FLAG_BITEXACT);
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if (!ctx->ch_units || !ctx->fdsp) {
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return AVERROR(ENOMEM);
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}
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for (i = 0; i < ctx->num_channel_blocks; i++) {
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for (ch = 0; ch < 2; ch++) {
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ctx->ch_units[i].channels[ch].ch_num = ch;
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ctx->ch_units[i].channels[ch].wnd_shape = &ctx->ch_units[i].channels[ch].wnd_shape_hist[0][0];
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ctx->ch_units[i].channels[ch].wnd_shape_prev = &ctx->ch_units[i].channels[ch].wnd_shape_hist[1][0];
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ctx->ch_units[i].channels[ch].gain_data = &ctx->ch_units[i].channels[ch].gain_data_hist[0][0];
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ctx->ch_units[i].channels[ch].gain_data_prev = &ctx->ch_units[i].channels[ch].gain_data_hist[1][0];
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ctx->ch_units[i].channels[ch].tones_info = &ctx->ch_units[i].channels[ch].tones_info_hist[0][0];
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ctx->ch_units[i].channels[ch].tones_info_prev = &ctx->ch_units[i].channels[ch].tones_info_hist[1][0];
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}
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ctx->ch_units[i].waves_info = &ctx->ch_units[i].wave_synth_hist[0];
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ctx->ch_units[i].waves_info_prev = &ctx->ch_units[i].wave_synth_hist[1];
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}
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avctx->sample_fmt = AV_SAMPLE_FMT_FLTP;
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return 0;
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}
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static void decode_residual_spectrum(ATRAC3PContext *ctx, Atrac3pChanUnitCtx *ch_unit,
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float out[2][ATRAC3P_FRAME_SAMPLES],
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int num_channels,
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AVCodecContext *avctx)
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{
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int i, sb, ch, qu, nspeclines, RNG_index;
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float *dst, q;
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int16_t *src;
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/* calculate RNG table index for each subband */
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int sb_RNG_index[ATRAC3P_SUBBANDS] = { 0 };
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if (ch_unit->mute_flag) {
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for (ch = 0; ch < num_channels; ch++)
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memset(out[ch], 0, ATRAC3P_FRAME_SAMPLES * sizeof(*out[ch]));
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return;
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}
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for (qu = 0, RNG_index = 0; qu < ch_unit->used_quant_units; qu++)
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RNG_index += ch_unit->channels[0].qu_sf_idx[qu] +
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ch_unit->channels[1].qu_sf_idx[qu];
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for (sb = 0; sb < ch_unit->num_coded_subbands; sb++, RNG_index += 128)
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sb_RNG_index[sb] = RNG_index & 0x3FC;
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/* inverse quant and power compensation */
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for (ch = 0; ch < num_channels; ch++) {
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/* clear channel's residual spectrum */
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memset(out[ch], 0, ATRAC3P_FRAME_SAMPLES * sizeof(*out[ch]));
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for (qu = 0; qu < ch_unit->used_quant_units; qu++) {
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src = &ch_unit->channels[ch].spectrum[ff_atrac3p_qu_to_spec_pos[qu]];
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dst = &out[ch][ff_atrac3p_qu_to_spec_pos[qu]];
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nspeclines = ff_atrac3p_qu_to_spec_pos[qu + 1] -
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ff_atrac3p_qu_to_spec_pos[qu];
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if (ch_unit->channels[ch].qu_wordlen[qu] > 0) {
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q = ff_atrac3p_sf_tab[ch_unit->channels[ch].qu_sf_idx[qu]] *
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ff_atrac3p_mant_tab[ch_unit->channels[ch].qu_wordlen[qu]];
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for (i = 0; i < nspeclines; i++)
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dst[i] = src[i] * q;
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}
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}
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for (sb = 0; sb < ch_unit->num_coded_subbands; sb++)
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ff_atrac3p_power_compensation(ch_unit, ctx->fdsp, ch, &out[ch][0],
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sb_RNG_index[sb], sb);
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}
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if (ch_unit->unit_type == CH_UNIT_STEREO) {
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for (sb = 0; sb < ch_unit->num_coded_subbands; sb++) {
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if (ch_unit->swap_channels[sb]) {
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for (i = 0; i < ATRAC3P_SUBBAND_SAMPLES; i++)
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FFSWAP(float, out[0][sb * ATRAC3P_SUBBAND_SAMPLES + i],
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out[1][sb * ATRAC3P_SUBBAND_SAMPLES + i]);
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}
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/* flip coefficients' sign if requested */
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if (ch_unit->negate_coeffs[sb])
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for (i = 0; i < ATRAC3P_SUBBAND_SAMPLES; i++)
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out[1][sb * ATRAC3P_SUBBAND_SAMPLES + i] = -(out[1][sb * ATRAC3P_SUBBAND_SAMPLES + i]);
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}
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}
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}
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static void reconstruct_frame(ATRAC3PContext *ctx, Atrac3pChanUnitCtx *ch_unit,
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int num_channels, AVCodecContext *avctx)
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{
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int ch, sb;
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for (ch = 0; ch < num_channels; ch++) {
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for (sb = 0; sb < ch_unit->num_subbands; sb++) {
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/* inverse transform and windowing */
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ff_atrac3p_imdct(ctx->fdsp, &ctx->mdct_ctx,
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&ctx->samples[ch][sb * ATRAC3P_SUBBAND_SAMPLES],
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&ctx->mdct_buf[ch][sb * ATRAC3P_SUBBAND_SAMPLES],
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(ch_unit->channels[ch].wnd_shape_prev[sb] << 1) +
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ch_unit->channels[ch].wnd_shape[sb], sb);
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/* gain compensation and overlapping */
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ff_atrac_gain_compensation(&ctx->gainc_ctx,
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&ctx->mdct_buf[ch][sb * ATRAC3P_SUBBAND_SAMPLES],
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&ch_unit->prev_buf[ch][sb * ATRAC3P_SUBBAND_SAMPLES],
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&ch_unit->channels[ch].gain_data_prev[sb],
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&ch_unit->channels[ch].gain_data[sb],
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ATRAC3P_SUBBAND_SAMPLES,
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&ctx->time_buf[ch][sb * ATRAC3P_SUBBAND_SAMPLES]);
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}
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/* zero unused subbands in both output and overlapping buffers */
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memset(&ch_unit->prev_buf[ch][ch_unit->num_subbands * ATRAC3P_SUBBAND_SAMPLES],
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0,
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(ATRAC3P_SUBBANDS - ch_unit->num_subbands) *
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ATRAC3P_SUBBAND_SAMPLES *
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sizeof(ch_unit->prev_buf[ch][ch_unit->num_subbands * ATRAC3P_SUBBAND_SAMPLES]));
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memset(&ctx->time_buf[ch][ch_unit->num_subbands * ATRAC3P_SUBBAND_SAMPLES],
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0,
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(ATRAC3P_SUBBANDS - ch_unit->num_subbands) *
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ATRAC3P_SUBBAND_SAMPLES *
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sizeof(ctx->time_buf[ch][ch_unit->num_subbands * ATRAC3P_SUBBAND_SAMPLES]));
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/* resynthesize and add tonal signal */
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if (ch_unit->waves_info->tones_present ||
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ch_unit->waves_info_prev->tones_present) {
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for (sb = 0; sb < ch_unit->num_subbands; sb++)
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if (ch_unit->channels[ch].tones_info[sb].num_wavs ||
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ch_unit->channels[ch].tones_info_prev[sb].num_wavs) {
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ff_atrac3p_generate_tones(ch_unit, ctx->fdsp, ch, sb,
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&ctx->time_buf[ch][sb * 128]);
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}
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}
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/* subband synthesis and acoustic signal output */
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ff_atrac3p_ipqf(&ctx->ipqf_dct_ctx, &ch_unit->ipqf_ctx[ch],
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&ctx->time_buf[ch][0], &ctx->outp_buf[ch][0]);
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}
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/* swap window shape and gain control buffers. */
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for (ch = 0; ch < num_channels; ch++) {
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FFSWAP(uint8_t *, ch_unit->channels[ch].wnd_shape,
|
||
|
|
ch_unit->channels[ch].wnd_shape_prev);
|
||
|
|
FFSWAP(AtracGainInfo *, ch_unit->channels[ch].gain_data,
|
||
|
|
ch_unit->channels[ch].gain_data_prev);
|
||
|
|
FFSWAP(Atrac3pWavesData *, ch_unit->channels[ch].tones_info,
|
||
|
|
ch_unit->channels[ch].tones_info_prev);
|
||
|
|
}
|
||
|
|
|
||
|
|
FFSWAP(Atrac3pWaveSynthParams *, ch_unit->waves_info, ch_unit->waves_info_prev);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int atrac3p_decode_frame(AVCodecContext *avctx, void *data,
|
||
|
|
int *got_frame_ptr, AVPacket *avpkt)
|
||
|
|
{
|
||
|
|
ATRAC3PContext *ctx = avctx->priv_data;
|
||
|
|
AVFrame *frame = data;
|
||
|
|
int i, ret, ch_unit_id, ch_block = 0, out_ch_index = 0, channels_to_process;
|
||
|
|
float **samples_p = (float **)frame->extended_data;
|
||
|
|
|
||
|
|
frame->nb_samples = ATRAC3P_FRAME_SAMPLES;
|
||
|
|
if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
|
||
|
|
return ret;
|
||
|
|
|
||
|
|
if ((ret = init_get_bits8(&ctx->gb, avpkt->data, avpkt->size)) < 0)
|
||
|
|
return ret;
|
||
|
|
|
||
|
|
if (get_bits1(&ctx->gb)) {
|
||
|
|
av_log(avctx, AV_LOG_ERROR, "Invalid start bit!\n");
|
||
|
|
return AVERROR_INVALIDDATA;
|
||
|
|
}
|
||
|
|
|
||
|
|
while (get_bits_left(&ctx->gb) >= 2 &&
|
||
|
|
(ch_unit_id = get_bits(&ctx->gb, 2)) != CH_UNIT_TERMINATOR) {
|
||
|
|
if (ch_unit_id == CH_UNIT_EXTENSION) {
|
||
|
|
avpriv_report_missing_feature(avctx, "Channel unit extension");
|
||
|
|
return AVERROR_PATCHWELCOME;
|
||
|
|
}
|
||
|
|
if (ch_block >= ctx->num_channel_blocks ||
|
||
|
|
ctx->channel_blocks[ch_block] != ch_unit_id) {
|
||
|
|
av_log(avctx, AV_LOG_ERROR,
|
||
|
|
"Frame data doesn't match channel configuration!\n");
|
||
|
|
return AVERROR_INVALIDDATA;
|
||
|
|
}
|
||
|
|
|
||
|
|
ctx->ch_units[ch_block].unit_type = ch_unit_id;
|
||
|
|
channels_to_process = ch_unit_id + 1;
|
||
|
|
|
||
|
|
if ((ret = ff_atrac3p_decode_channel_unit(&ctx->gb,
|
||
|
|
&ctx->ch_units[ch_block],
|
||
|
|
channels_to_process,
|
||
|
|
avctx)) < 0)
|
||
|
|
return ret;
|
||
|
|
|
||
|
|
decode_residual_spectrum(ctx, &ctx->ch_units[ch_block], ctx->samples,
|
||
|
|
channels_to_process, avctx);
|
||
|
|
reconstruct_frame(ctx, &ctx->ch_units[ch_block],
|
||
|
|
channels_to_process, avctx);
|
||
|
|
|
||
|
|
for (i = 0; i < channels_to_process; i++)
|
||
|
|
memcpy(samples_p[out_ch_index + i], ctx->outp_buf[i],
|
||
|
|
ATRAC3P_FRAME_SAMPLES * sizeof(**samples_p));
|
||
|
|
|
||
|
|
ch_block++;
|
||
|
|
out_ch_index += channels_to_process;
|
||
|
|
}
|
||
|
|
|
||
|
|
*got_frame_ptr = 1;
|
||
|
|
|
||
|
|
return avctx->codec_id == AV_CODEC_ID_ATRAC3P ? FFMIN(avctx->block_align, avpkt->size) : avpkt->size;
|
||
|
|
}
|
||
|
|
|
||
|
|
AVCodec ff_atrac3p_decoder = {
|
||
|
|
.name = "atrac3plus",
|
||
|
|
.long_name = NULL_IF_CONFIG_SMALL("ATRAC3+ (Adaptive TRansform Acoustic Coding 3+)"),
|
||
|
|
.type = AVMEDIA_TYPE_AUDIO,
|
||
|
|
.id = AV_CODEC_ID_ATRAC3P,
|
||
|
|
.capabilities = AV_CODEC_CAP_DR1,
|
||
|
|
.caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
|
||
|
|
.priv_data_size = sizeof(ATRAC3PContext),
|
||
|
|
.init = atrac3p_decode_init,
|
||
|
|
.close = atrac3p_decode_close,
|
||
|
|
.decode = atrac3p_decode_frame,
|
||
|
|
};
|
||
|
|
|
||
|
|
AVCodec ff_atrac3pal_decoder = {
|
||
|
|
.name = "atrac3plusal",
|
||
|
|
.long_name = NULL_IF_CONFIG_SMALL("ATRAC3+ AL (Adaptive TRansform Acoustic Coding 3+ Advanced Lossless)"),
|
||
|
|
.type = AVMEDIA_TYPE_AUDIO,
|
||
|
|
.id = AV_CODEC_ID_ATRAC3PAL,
|
||
|
|
.capabilities = AV_CODEC_CAP_DR1,
|
||
|
|
.caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
|
||
|
|
.priv_data_size = sizeof(ATRAC3PContext),
|
||
|
|
.init = atrac3p_decode_init,
|
||
|
|
.close = atrac3p_decode_close,
|
||
|
|
.decode = atrac3p_decode_frame,
|
||
|
|
};
|