458 lines
14 KiB
C
458 lines
14 KiB
C
/*
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* TTA (The Lossless True Audio) decoder
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* Copyright (c) 2006 Alex Beregszaszi
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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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* TTA (The Lossless True Audio) decoder
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* @see http://www.true-audio.com/
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* @see http://tta.corecodec.org/
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* @author Alex Beregszaszi
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*/
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#define BITSTREAM_READER_LE
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#include <limits.h>
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#include "config.h"
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#include "ttadata.h"
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#include "avcodec.h"
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#include "get_bits.h"
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#include "thread.h"
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#include "unary.h"
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#include "internal.h"
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#include "libavutil/crc.h"
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#include "libavutil/intreadwrite.h"
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#include "libavutil/opt.h"
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#include "libavutil/internal.h"
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#define FORMAT_SIMPLE 1
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#define FORMAT_ENCRYPTED 2
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typedef struct TTAContext {
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AVClass *class;
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AVCodecContext *avctx;
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const AVCRC *crc_table;
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int format, channels, bps;
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unsigned data_length;
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int frame_length, last_frame_length;
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int32_t *decode_buffer;
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uint8_t crc_pass[8];
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uint8_t *pass;
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TTAChannel *ch_ctx;
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} TTAContext;
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static inline void ttafilter_process(TTAFilter *c, int32_t *in)
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{
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register int32_t *dl = c->dl, *qm = c->qm, *dx = c->dx, sum = c->round;
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if (c->error < 0) {
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qm[0] -= dx[0]; qm[1] -= dx[1]; qm[2] -= dx[2]; qm[3] -= dx[3];
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qm[4] -= dx[4]; qm[5] -= dx[5]; qm[6] -= dx[6]; qm[7] -= dx[7];
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} else if (c->error > 0) {
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qm[0] += dx[0]; qm[1] += dx[1]; qm[2] += dx[2]; qm[3] += dx[3];
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qm[4] += dx[4]; qm[5] += dx[5]; qm[6] += dx[6]; qm[7] += dx[7];
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}
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sum += dl[0] * qm[0] + dl[1] * qm[1] + dl[2] * qm[2] + dl[3] * qm[3] +
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dl[4] * qm[4] + dl[5] * qm[5] + dl[6] * qm[6] + dl[7] * qm[7];
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dx[0] = dx[1]; dx[1] = dx[2]; dx[2] = dx[3]; dx[3] = dx[4];
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dl[0] = dl[1]; dl[1] = dl[2]; dl[2] = dl[3]; dl[3] = dl[4];
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dx[4] = ((dl[4] >> 30) | 1);
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dx[5] = ((dl[5] >> 30) | 2) & ~1;
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dx[6] = ((dl[6] >> 30) | 2) & ~1;
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dx[7] = ((dl[7] >> 30) | 4) & ~3;
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c->error = *in;
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*in += (sum >> c->shift);
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dl[4] = -dl[5]; dl[5] = -dl[6];
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dl[6] = *in - dl[7]; dl[7] = *in;
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dl[5] += dl[6]; dl[4] += dl[5];
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}
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static const int64_t tta_channel_layouts[7] = {
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AV_CH_LAYOUT_STEREO,
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AV_CH_LAYOUT_STEREO|AV_CH_LOW_FREQUENCY,
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AV_CH_LAYOUT_QUAD,
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0,
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AV_CH_LAYOUT_5POINT1_BACK,
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AV_CH_LAYOUT_5POINT1_BACK|AV_CH_BACK_CENTER,
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AV_CH_LAYOUT_7POINT1_WIDE
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};
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static int tta_check_crc(TTAContext *s, const uint8_t *buf, int buf_size)
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{
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uint32_t crc, CRC;
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CRC = AV_RL32(buf + buf_size);
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crc = av_crc(s->crc_table, 0xFFFFFFFFU, buf, buf_size);
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if (CRC != (crc ^ 0xFFFFFFFFU)) {
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av_log(s->avctx, AV_LOG_ERROR, "CRC error\n");
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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 uint64_t tta_check_crc64(uint8_t *pass)
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{
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uint64_t crc = UINT64_MAX, poly = 0x42F0E1EBA9EA3693U;
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uint8_t *end = pass + strlen((const char *) pass);
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int i;
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while (pass < end) {
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crc ^= (uint64_t)*pass++ << 56;
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for (i = 0; i < 8; i++)
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crc = (crc << 1) ^ (poly & (((int64_t) crc) >> 63));
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}
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return crc ^ UINT64_MAX;
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}
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static int allocate_buffers(AVCodecContext *avctx)
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{
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TTAContext *s = avctx->priv_data;
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if (s->bps < 3) {
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s->decode_buffer = av_mallocz(sizeof(int32_t)*s->frame_length*s->channels);
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if (!s->decode_buffer)
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return AVERROR(ENOMEM);
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} else
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s->decode_buffer = NULL;
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s->ch_ctx = av_malloc(avctx->channels * sizeof(*s->ch_ctx));
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if (!s->ch_ctx) {
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av_freep(&s->decode_buffer);
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return AVERROR(ENOMEM);
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}
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return 0;
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}
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static av_cold int tta_decode_init(AVCodecContext * avctx)
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{
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TTAContext *s = avctx->priv_data;
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GetBitContext gb;
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int total_frames;
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s->avctx = avctx;
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// 30bytes includes TTA1 header
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if (avctx->extradata_size < 22)
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return AVERROR_INVALIDDATA;
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s->crc_table = av_crc_get_table(AV_CRC_32_IEEE_LE);
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init_get_bits8(&gb, avctx->extradata, avctx->extradata_size);
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if (show_bits_long(&gb, 32) == AV_RL32("TTA1")) {
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/* signature */
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skip_bits_long(&gb, 32);
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s->format = get_bits(&gb, 16);
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if (s->format > 2) {
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av_log(avctx, AV_LOG_ERROR, "Invalid format\n");
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return AVERROR_INVALIDDATA;
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}
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if (s->format == FORMAT_ENCRYPTED) {
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if (!s->pass) {
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av_log(avctx, AV_LOG_ERROR, "Missing password for encrypted stream. Please use the -password option\n");
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return AVERROR(EINVAL);
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}
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AV_WL64(s->crc_pass, tta_check_crc64(s->pass));
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}
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avctx->channels = s->channels = get_bits(&gb, 16);
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if (s->channels > 1 && s->channels < 9)
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avctx->channel_layout = tta_channel_layouts[s->channels-2];
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avctx->bits_per_raw_sample = get_bits(&gb, 16);
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s->bps = (avctx->bits_per_raw_sample + 7) / 8;
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avctx->sample_rate = get_bits_long(&gb, 32);
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s->data_length = get_bits_long(&gb, 32);
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skip_bits_long(&gb, 32); // CRC32 of header
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if (s->channels == 0) {
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av_log(avctx, AV_LOG_ERROR, "Invalid number of channels\n");
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return AVERROR_INVALIDDATA;
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} else if (avctx->sample_rate == 0) {
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av_log(avctx, AV_LOG_ERROR, "Invalid samplerate\n");
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return AVERROR_INVALIDDATA;
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}
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switch(s->bps) {
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case 1: avctx->sample_fmt = AV_SAMPLE_FMT_U8; break;
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case 2:
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avctx->sample_fmt = AV_SAMPLE_FMT_S16;
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break;
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case 3:
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avctx->sample_fmt = AV_SAMPLE_FMT_S32;
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break;
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//case 4: avctx->sample_fmt = AV_SAMPLE_FMT_S32; break;
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default:
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av_log(avctx, AV_LOG_ERROR, "Invalid/unsupported sample format.\n");
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return AVERROR_INVALIDDATA;
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}
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// prevent overflow
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if (avctx->sample_rate > 0x7FFFFFu) {
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av_log(avctx, AV_LOG_ERROR, "sample_rate too large\n");
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return AVERROR(EINVAL);
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}
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s->frame_length = 256 * avctx->sample_rate / 245;
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s->last_frame_length = s->data_length % s->frame_length;
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total_frames = s->data_length / s->frame_length +
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(s->last_frame_length ? 1 : 0);
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av_log(avctx, AV_LOG_DEBUG, "format: %d chans: %d bps: %d rate: %d block: %d\n",
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s->format, avctx->channels, avctx->bits_per_coded_sample, avctx->sample_rate,
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avctx->block_align);
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av_log(avctx, AV_LOG_DEBUG, "data_length: %d frame_length: %d last: %d total: %d\n",
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s->data_length, s->frame_length, s->last_frame_length, total_frames);
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if(s->frame_length >= UINT_MAX / (s->channels * sizeof(int32_t))){
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av_log(avctx, AV_LOG_ERROR, "frame_length too large\n");
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return AVERROR_INVALIDDATA;
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}
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} else {
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av_log(avctx, AV_LOG_ERROR, "Wrong extradata present\n");
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return AVERROR_INVALIDDATA;
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}
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return allocate_buffers(avctx);
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}
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static int tta_decode_frame(AVCodecContext *avctx, void *data,
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int *got_frame_ptr, AVPacket *avpkt)
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{
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AVFrame *frame = data;
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ThreadFrame tframe = { .f = data };
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const uint8_t *buf = avpkt->data;
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int buf_size = avpkt->size;
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TTAContext *s = avctx->priv_data;
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GetBitContext gb;
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int i, ret;
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int cur_chan = 0, framelen = s->frame_length;
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int32_t *p;
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if (avctx->err_recognition & AV_EF_CRCCHECK) {
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if (buf_size < 4 || tta_check_crc(s, buf, buf_size - 4))
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return AVERROR_INVALIDDATA;
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}
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if ((ret = init_get_bits8(&gb, avpkt->data, avpkt->size)) < 0)
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return ret;
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/* get output buffer */
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frame->nb_samples = framelen;
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if ((ret = ff_thread_get_buffer(avctx, &tframe, 0)) < 0)
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return ret;
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// decode directly to output buffer for 24-bit sample format
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if (s->bps == 3)
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s->decode_buffer = (int32_t *)frame->data[0];
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// init per channel states
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for (i = 0; i < s->channels; i++) {
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TTAFilter *filter = &s->ch_ctx[i].filter;
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s->ch_ctx[i].predictor = 0;
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ff_tta_filter_init(filter, ff_tta_filter_configs[s->bps-1]);
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if (s->format == FORMAT_ENCRYPTED) {
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int i;
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for (i = 0; i < 8; i++)
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filter->qm[i] = sign_extend(s->crc_pass[i], 8);
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}
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ff_tta_rice_init(&s->ch_ctx[i].rice, 10, 10);
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}
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i = 0;
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for (p = s->decode_buffer; p < s->decode_buffer + (framelen * s->channels); p++) {
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int32_t *predictor = &s->ch_ctx[cur_chan].predictor;
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TTAFilter *filter = &s->ch_ctx[cur_chan].filter;
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TTARice *rice = &s->ch_ctx[cur_chan].rice;
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uint32_t unary, depth, k;
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int32_t value;
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unary = get_unary(&gb, 0, get_bits_left(&gb));
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if (unary == 0) {
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depth = 0;
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k = rice->k0;
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} else {
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depth = 1;
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k = rice->k1;
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unary--;
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}
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if (get_bits_left(&gb) < k) {
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ret = AVERROR_INVALIDDATA;
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goto error;
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}
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if (k) {
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if (k > MIN_CACHE_BITS) {
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ret = AVERROR_INVALIDDATA;
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goto error;
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}
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value = (unary << k) + get_bits(&gb, k);
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} else
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value = unary;
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// FIXME: copy paste from original
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switch (depth) {
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case 1:
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rice->sum1 += value - (rice->sum1 >> 4);
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if (rice->k1 > 0 && rice->sum1 < ff_tta_shift_16[rice->k1])
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rice->k1--;
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else if(rice->sum1 > ff_tta_shift_16[rice->k1 + 1])
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rice->k1++;
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value += ff_tta_shift_1[rice->k0];
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default:
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rice->sum0 += value - (rice->sum0 >> 4);
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if (rice->k0 > 0 && rice->sum0 < ff_tta_shift_16[rice->k0])
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rice->k0--;
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else if(rice->sum0 > ff_tta_shift_16[rice->k0 + 1])
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rice->k0++;
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}
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// extract coded value
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*p = 1 + ((value >> 1) ^ ((value & 1) - 1));
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// run hybrid filter
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ttafilter_process(filter, p);
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// fixed order prediction
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#define PRED(x, k) (int32_t)((((uint64_t)x << k) - x) >> k)
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switch (s->bps) {
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case 1: *p += PRED(*predictor, 4); break;
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case 2:
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case 3: *p += PRED(*predictor, 5); break;
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case 4: *p += *predictor; break;
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}
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*predictor = *p;
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// flip channels
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if (cur_chan < (s->channels-1))
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cur_chan++;
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else {
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// decorrelate in case of multiple channels
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if (s->channels > 1) {
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int32_t *r = p - 1;
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for (*p += *r / 2; r > p - s->channels; r--)
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*r = *(r + 1) - *r;
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}
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cur_chan = 0;
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i++;
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// check for last frame
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if (i == s->last_frame_length && get_bits_left(&gb) / 8 == 4) {
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frame->nb_samples = framelen = s->last_frame_length;
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break;
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}
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}
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}
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align_get_bits(&gb);
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if (get_bits_left(&gb) < 32) {
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ret = AVERROR_INVALIDDATA;
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goto error;
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}
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skip_bits_long(&gb, 32); // frame crc
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// convert to output buffer
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switch (s->bps) {
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case 1: {
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uint8_t *samples = (uint8_t *)frame->data[0];
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for (p = s->decode_buffer; p < s->decode_buffer + (framelen * s->channels); p++)
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*samples++ = *p + 0x80;
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break;
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}
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case 2: {
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int16_t *samples = (int16_t *)frame->data[0];
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for (p = s->decode_buffer; p < s->decode_buffer + (framelen * s->channels); p++)
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*samples++ = *p;
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break;
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}
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case 3: {
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// shift samples for 24-bit sample format
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int32_t *samples = (int32_t *)frame->data[0];
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for (i = 0; i < framelen * s->channels; i++)
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*samples++ <<= 8;
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// reset decode buffer
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s->decode_buffer = NULL;
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break;
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}
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}
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*got_frame_ptr = 1;
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return buf_size;
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error:
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// reset decode buffer
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if (s->bps == 3)
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s->decode_buffer = NULL;
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return ret;
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}
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static int init_thread_copy(AVCodecContext *avctx)
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{
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TTAContext *s = avctx->priv_data;
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s->avctx = avctx;
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return allocate_buffers(avctx);
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}
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static av_cold int tta_decode_close(AVCodecContext *avctx) {
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TTAContext *s = avctx->priv_data;
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if (s->bps < 3)
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av_free(s->decode_buffer);
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s->decode_buffer = NULL;
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av_freep(&s->ch_ctx);
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return 0;
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}
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#define OFFSET(x) offsetof(TTAContext, x)
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#define DEC (AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_AUDIO_PARAM)
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static const AVOption options[] = {
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{ "password", "Set decoding password", OFFSET(pass), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, DEC },
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{ NULL },
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};
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static const AVClass tta_decoder_class = {
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.class_name = "TTA 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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AVCodec ff_tta_decoder = {
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.name = "tta",
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.long_name = NULL_IF_CONFIG_SMALL("TTA (True Audio)"),
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.type = AVMEDIA_TYPE_AUDIO,
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.id = AV_CODEC_ID_TTA,
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.priv_data_size = sizeof(TTAContext),
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.init = tta_decode_init,
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.close = tta_decode_close,
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.decode = tta_decode_frame,
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.init_thread_copy = ONLY_IF_THREADS_ENABLED(init_thread_copy),
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.capabilities = CODEC_CAP_DR1 | CODEC_CAP_FRAME_THREADS,
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.priv_class = &tta_decoder_class,
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};
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