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FFmpeg/libavcodec/atrac3plusdec.c
Andreas Rheinhardt a247ac640d avcodec: Constify AVCodecs 
Given that the AVCodec.next pointer has now been removed, most of the
AVCodecs are not modified at all any more and can therefore be made
const (as this patch does); the only exceptions are the very few codecs
for external libraries that have a init_static_data callback.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
Signed-off-by: James Almer <jamrial@gmail.com>
2021-04-27 10:43:15 -03:00

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/*
* ATRAC3+ compatible decoder
*
* Copyright (c) 2010-2013 Maxim Poliakovski
*
* 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
* Sony ATRAC3+ compatible decoder.
*
* Container formats used to store its data:
* RIFF WAV (.at3) and Sony OpenMG (.oma, .aa3).
*
* Technical description of this codec can be found here:
* http://wiki.multimedia.cx/index.php?title=ATRAC3plus
*
* Kudos to Benjamin Larsson and Michael Karcher
* for their precious technical help!
*/
#include <stdint.h>
#include <string.h>
#include "libavutil/channel_layout.h"
#include "libavutil/float_dsp.h"
#include "libavutil/mem_internal.h"
#include "libavutil/thread.h"
#include "avcodec.h"
#include "get_bits.h"
#include "internal.h"
#include "atrac.h"
#include "atrac3plus.h"
typedef struct ATRAC3PContext {
GetBitContext gb;
AVFloatDSPContext *fdsp;
DECLARE_ALIGNED(32, float, samples)[2][ATRAC3P_FRAME_SAMPLES]; ///< quantized MDCT spectrum
DECLARE_ALIGNED(32, float, mdct_buf)[2][ATRAC3P_FRAME_SAMPLES]; ///< output of the IMDCT
DECLARE_ALIGNED(32, float, time_buf)[2][ATRAC3P_FRAME_SAMPLES]; ///< output of the gain compensation
DECLARE_ALIGNED(32, float, outp_buf)[2][ATRAC3P_FRAME_SAMPLES];
AtracGCContext gainc_ctx; ///< gain compensation context
FFTContext mdct_ctx;
FFTContext ipqf_dct_ctx; ///< IDCT context used by IPQF
Atrac3pChanUnitCtx *ch_units; ///< global channel units
int num_channel_blocks; ///< number of channel blocks
uint8_t channel_blocks[5]; ///< channel configuration descriptor
uint64_t my_channel_layout; ///< current channel layout
} ATRAC3PContext;
static av_cold int atrac3p_decode_close(AVCodecContext *avctx)
{
ATRAC3PContext *ctx = avctx->priv_data;
av_freep(&ctx->ch_units);
av_freep(&ctx->fdsp);
ff_mdct_end(&ctx->mdct_ctx);
ff_mdct_end(&ctx->ipqf_dct_ctx);
return 0;
}
static av_cold int set_channel_params(ATRAC3PContext *ctx,
AVCodecContext *avctx)
{
memset(ctx->channel_blocks, 0, sizeof(ctx->channel_blocks));
switch (avctx->channels) {
case 1:
if (avctx->channel_layout != AV_CH_FRONT_LEFT)
avctx->channel_layout = AV_CH_LAYOUT_MONO;
ctx->num_channel_blocks = 1;
ctx->channel_blocks[0] = CH_UNIT_MONO;
break;
case 2:
avctx->channel_layout = AV_CH_LAYOUT_STEREO;
ctx->num_channel_blocks = 1;
ctx->channel_blocks[0] = CH_UNIT_STEREO;
break;
case 3:
avctx->channel_layout = AV_CH_LAYOUT_SURROUND;
ctx->num_channel_blocks = 2;
ctx->channel_blocks[0] = CH_UNIT_STEREO;
ctx->channel_blocks[1] = CH_UNIT_MONO;
break;
case 4:
avctx->channel_layout = AV_CH_LAYOUT_4POINT0;
ctx->num_channel_blocks = 3;
ctx->channel_blocks[0] = CH_UNIT_STEREO;
ctx->channel_blocks[1] = CH_UNIT_MONO;
ctx->channel_blocks[2] = CH_UNIT_MONO;
break;
case 6:
avctx->channel_layout = AV_CH_LAYOUT_5POINT1_BACK;
ctx->num_channel_blocks = 4;
ctx->channel_blocks[0] = CH_UNIT_STEREO;
ctx->channel_blocks[1] = CH_UNIT_MONO;
ctx->channel_blocks[2] = CH_UNIT_STEREO;
ctx->channel_blocks[3] = CH_UNIT_MONO;
break;
case 7:
avctx->channel_layout = AV_CH_LAYOUT_6POINT1_BACK;
ctx->num_channel_blocks = 5;
ctx->channel_blocks[0] = CH_UNIT_STEREO;
ctx->channel_blocks[1] = CH_UNIT_MONO;
ctx->channel_blocks[2] = CH_UNIT_STEREO;
ctx->channel_blocks[3] = CH_UNIT_MONO;
ctx->channel_blocks[4] = CH_UNIT_MONO;
break;
case 8:
avctx->channel_layout = AV_CH_LAYOUT_7POINT1;
ctx->num_channel_blocks = 5;
ctx->channel_blocks[0] = CH_UNIT_STEREO;
ctx->channel_blocks[1] = CH_UNIT_MONO;
ctx->channel_blocks[2] = CH_UNIT_STEREO;
ctx->channel_blocks[3] = CH_UNIT_STEREO;
ctx->channel_blocks[4] = CH_UNIT_MONO;
break;
default:
av_log(avctx, AV_LOG_ERROR,
"Unsupported channel count: %d!\n", avctx->channels);
return AVERROR_INVALIDDATA;
}
return 0;
}
static av_cold void atrac3p_init_static(void)
{
ff_atrac3p_init_vlcs();
ff_atrac3p_init_dsp_static();
}
static av_cold int atrac3p_decode_init(AVCodecContext *avctx)
{
static AVOnce init_static_once = AV_ONCE_INIT;
ATRAC3PContext *ctx = avctx->priv_data;
int i, ch, ret;
if (!avctx->block_align) {
av_log(avctx, AV_LOG_ERROR, "block_align is not set\n");
return AVERROR(EINVAL);
}
/* initialize IPQF */
ff_mdct_init(&ctx->ipqf_dct_ctx, 5, 1, 32.0 / 32768.0);
ff_atrac3p_init_imdct(avctx, &ctx->mdct_ctx);
ff_atrac_init_gain_compensation(&ctx->gainc_ctx, 6, 2);
if ((ret = set_channel_params(ctx, avctx)) < 0)
return ret;
ctx->my_channel_layout = avctx->channel_layout;
ctx->ch_units = av_mallocz_array(ctx->num_channel_blocks, sizeof(*ctx->ch_units));
ctx->fdsp = avpriv_float_dsp_alloc(avctx->flags & AV_CODEC_FLAG_BITEXACT);
if (!ctx->ch_units || !ctx->fdsp) {
return AVERROR(ENOMEM);
}
for (i = 0; i < ctx->num_channel_blocks; i++) {
for (ch = 0; ch < 2; ch++) {
ctx->ch_units[i].channels[ch].ch_num = ch;
ctx->ch_units[i].channels[ch].wnd_shape = &ctx->ch_units[i].channels[ch].wnd_shape_hist[0][0];
ctx->ch_units[i].channels[ch].wnd_shape_prev = &ctx->ch_units[i].channels[ch].wnd_shape_hist[1][0];
ctx->ch_units[i].channels[ch].gain_data = &ctx->ch_units[i].channels[ch].gain_data_hist[0][0];
ctx->ch_units[i].channels[ch].gain_data_prev = &ctx->ch_units[i].channels[ch].gain_data_hist[1][0];
ctx->ch_units[i].channels[ch].tones_info = &ctx->ch_units[i].channels[ch].tones_info_hist[0][0];
ctx->ch_units[i].channels[ch].tones_info_prev = &ctx->ch_units[i].channels[ch].tones_info_hist[1][0];
}
ctx->ch_units[i].waves_info = &ctx->ch_units[i].wave_synth_hist[0];
ctx->ch_units[i].waves_info_prev = &ctx->ch_units[i].wave_synth_hist[1];
}
avctx->sample_fmt = AV_SAMPLE_FMT_FLTP;
ff_thread_once(&init_static_once, atrac3p_init_static);
return 0;
}
static void decode_residual_spectrum(ATRAC3PContext *ctx, Atrac3pChanUnitCtx *ch_unit,
float out[2][ATRAC3P_FRAME_SAMPLES],
int num_channels,
AVCodecContext *avctx)
{
int i, sb, ch, qu, nspeclines, RNG_index;
float *dst, q;
int16_t *src;
/* calculate RNG table index for each subband */
int sb_RNG_index[ATRAC3P_SUBBANDS] = { 0 };
if (ch_unit->mute_flag) {
for (ch = 0; ch < num_channels; ch++)
memset(out[ch], 0, ATRAC3P_FRAME_SAMPLES * sizeof(*out[ch]));
return;
}
for (qu = 0, RNG_index = 0; qu < ch_unit->used_quant_units; qu++)
RNG_index += ch_unit->channels[0].qu_sf_idx[qu] +
ch_unit->channels[1].qu_sf_idx[qu];
for (sb = 0; sb < ch_unit->num_coded_subbands; sb++, RNG_index += 128)
sb_RNG_index[sb] = RNG_index & 0x3FC;
/* inverse quant and power compensation */
for (ch = 0; ch < num_channels; ch++) {
/* clear channel's residual spectrum */
memset(out[ch], 0, ATRAC3P_FRAME_SAMPLES * sizeof(*out[ch]));
for (qu = 0; qu < ch_unit->used_quant_units; qu++) {
src = &ch_unit->channels[ch].spectrum[ff_atrac3p_qu_to_spec_pos[qu]];
dst = &out[ch][ff_atrac3p_qu_to_spec_pos[qu]];
nspeclines = ff_atrac3p_qu_to_spec_pos[qu + 1] -
ff_atrac3p_qu_to_spec_pos[qu];
if (ch_unit->channels[ch].qu_wordlen[qu] > 0) {
q = ff_atrac3p_sf_tab[ch_unit->channels[ch].qu_sf_idx[qu]] *
ff_atrac3p_mant_tab[ch_unit->channels[ch].qu_wordlen[qu]];
for (i = 0; i < nspeclines; i++)
dst[i] = src[i] * q;
}
}
for (sb = 0; sb < ch_unit->num_coded_subbands; sb++)
ff_atrac3p_power_compensation(ch_unit, ctx->fdsp, ch, &out[ch][0],
sb_RNG_index[sb], sb);
}
if (ch_unit->unit_type == CH_UNIT_STEREO) {
for (sb = 0; sb < ch_unit->num_coded_subbands; sb++) {
if (ch_unit->swap_channels[sb]) {
for (i = 0; i < ATRAC3P_SUBBAND_SAMPLES; i++)
FFSWAP(float, out[0][sb * ATRAC3P_SUBBAND_SAMPLES + i],
out[1][sb * ATRAC3P_SUBBAND_SAMPLES + i]);
}
/* flip coefficients' sign if requested */
if (ch_unit->negate_coeffs[sb])
for (i = 0; i < ATRAC3P_SUBBAND_SAMPLES; i++)
out[1][sb * ATRAC3P_SUBBAND_SAMPLES + i] = -(out[1][sb * ATRAC3P_SUBBAND_SAMPLES + i]);
}
}
}
static void reconstruct_frame(ATRAC3PContext *ctx, Atrac3pChanUnitCtx *ch_unit,
int num_channels, AVCodecContext *avctx)
{
int ch, sb;
for (ch = 0; ch < num_channels; ch++) {
for (sb = 0; sb < ch_unit->num_subbands; sb++) {
/* inverse transform and windowing */
ff_atrac3p_imdct(ctx->fdsp, &ctx->mdct_ctx,
&ctx->samples[ch][sb * ATRAC3P_SUBBAND_SAMPLES],
&ctx->mdct_buf[ch][sb * ATRAC3P_SUBBAND_SAMPLES],
(ch_unit->channels[ch].wnd_shape_prev[sb] << 1) +
ch_unit->channels[ch].wnd_shape[sb], sb);
/* gain compensation and overlapping */
ff_atrac_gain_compensation(&ctx->gainc_ctx,
&ctx->mdct_buf[ch][sb * ATRAC3P_SUBBAND_SAMPLES],
&ch_unit->prev_buf[ch][sb * ATRAC3P_SUBBAND_SAMPLES],
&ch_unit->channels[ch].gain_data_prev[sb],
&ch_unit->channels[ch].gain_data[sb],
ATRAC3P_SUBBAND_SAMPLES,
&ctx->time_buf[ch][sb * ATRAC3P_SUBBAND_SAMPLES]);
}
/* zero unused subbands in both output and overlapping buffers */
memset(&ch_unit->prev_buf[ch][ch_unit->num_subbands * ATRAC3P_SUBBAND_SAMPLES],
0,
(ATRAC3P_SUBBANDS - ch_unit->num_subbands) *
ATRAC3P_SUBBAND_SAMPLES *
sizeof(ch_unit->prev_buf[ch][ch_unit->num_subbands * ATRAC3P_SUBBAND_SAMPLES]));
memset(&ctx->time_buf[ch][ch_unit->num_subbands * ATRAC3P_SUBBAND_SAMPLES],
0,
(ATRAC3P_SUBBANDS - ch_unit->num_subbands) *
ATRAC3P_SUBBAND_SAMPLES *
sizeof(ctx->time_buf[ch][ch_unit->num_subbands * ATRAC3P_SUBBAND_SAMPLES]));
/* resynthesize and add tonal signal */
if (ch_unit->waves_info->tones_present ||
ch_unit->waves_info_prev->tones_present) {
for (sb = 0; sb < ch_unit->num_subbands; sb++)
if (ch_unit->channels[ch].tones_info[sb].num_wavs ||
ch_unit->channels[ch].tones_info_prev[sb].num_wavs) {
ff_atrac3p_generate_tones(ch_unit, ctx->fdsp, ch, sb,
&ctx->time_buf[ch][sb * 128]);
}
}
/* subband synthesis and acoustic signal output */
ff_atrac3p_ipqf(&ctx->ipqf_dct_ctx, &ch_unit->ipqf_ctx[ch],
&ctx->time_buf[ch][0], &ctx->outp_buf[ch][0]);
}
/* swap window shape and gain control buffers. */
for (ch = 0; ch < num_channels; ch++) {
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;
}
const 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_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP,
.priv_data_size = sizeof(ATRAC3PContext),
.init = atrac3p_decode_init,
.close = atrac3p_decode_close,
.decode = atrac3p_decode_frame,
};
const 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_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP,
.priv_data_size = sizeof(ATRAC3PContext),
.init = atrac3p_decode_init,
.close = atrac3p_decode_close,
.decode = atrac3p_decode_frame,
};
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