yading@10: /*
yading@10:  * TTA (The Lossless True Audio) decoder
yading@10:  * Copyright (c) 2006 Alex Beregszaszi
yading@10:  *
yading@10:  * This file is part of FFmpeg.
yading@10:  *
yading@10:  * FFmpeg is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * FFmpeg is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@10:  * Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with FFmpeg; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@10:  */
yading@10: 
yading@10: /**
yading@10:  * @file
yading@10:  * TTA (The Lossless True Audio) decoder
yading@10:  * @see http://www.true-audio.com/
yading@10:  * @see http://tta.corecodec.org/
yading@10:  * @author Alex Beregszaszi
yading@10:  */
yading@10: 
yading@10: #define BITSTREAM_READER_LE
yading@10: //#define DEBUG
yading@10: #include <limits.h>
yading@10: #include "avcodec.h"
yading@10: #include "get_bits.h"
yading@10: #include "internal.h"
yading@10: #include "libavutil/crc.h"
yading@10: #include "libavutil/intreadwrite.h"
yading@10: #include "libavutil/opt.h"
yading@10: 
yading@10: #define FORMAT_SIMPLE    1
yading@10: #define FORMAT_ENCRYPTED 2
yading@10: 
yading@10: #define MAX_ORDER 16
yading@10: typedef struct TTAFilter {
yading@10:     int32_t shift, round, error;
yading@10:     int32_t qm[MAX_ORDER];
yading@10:     int32_t dx[MAX_ORDER];
yading@10:     int32_t dl[MAX_ORDER];
yading@10: } TTAFilter;
yading@10: 
yading@10: typedef struct TTARice {
yading@10:     uint32_t k0, k1, sum0, sum1;
yading@10: } TTARice;
yading@10: 
yading@10: typedef struct TTAChannel {
yading@10:     int32_t predictor;
yading@10:     TTAFilter filter;
yading@10:     TTARice rice;
yading@10: } TTAChannel;
yading@10: 
yading@10: typedef struct TTAContext {
yading@10:     AVClass *class;
yading@10:     AVCodecContext *avctx;
yading@10:     GetBitContext gb;
yading@10:     const AVCRC *crc_table;
yading@10: 
yading@10:     int format, channels, bps;
yading@10:     unsigned data_length;
yading@10:     int frame_length, last_frame_length;
yading@10: 
yading@10:     int32_t *decode_buffer;
yading@10: 
yading@10:     uint8_t crc_pass[8];
yading@10:     uint8_t *pass;
yading@10:     TTAChannel *ch_ctx;
yading@10: } TTAContext;
yading@10: 
yading@10: static const uint32_t shift_1[] = {
yading@10:     0x00000001, 0x00000002, 0x00000004, 0x00000008,
yading@10:     0x00000010, 0x00000020, 0x00000040, 0x00000080,
yading@10:     0x00000100, 0x00000200, 0x00000400, 0x00000800,
yading@10:     0x00001000, 0x00002000, 0x00004000, 0x00008000,
yading@10:     0x00010000, 0x00020000, 0x00040000, 0x00080000,
yading@10:     0x00100000, 0x00200000, 0x00400000, 0x00800000,
yading@10:     0x01000000, 0x02000000, 0x04000000, 0x08000000,
yading@10:     0x10000000, 0x20000000, 0x40000000, 0x80000000,
yading@10:     0x80000000, 0x80000000, 0x80000000, 0x80000000,
yading@10:     0x80000000, 0x80000000, 0x80000000, 0x80000000
yading@10: };
yading@10: 
yading@10: static const uint32_t * const shift_16 = shift_1 + 4;
yading@10: 
yading@10: static const int32_t ttafilter_configs[4] = {
yading@10:     10,
yading@10:     9,
yading@10:     10,
yading@10:     12
yading@10: };
yading@10: 
yading@10: static void ttafilter_init(TTAContext *s, TTAFilter *c, int32_t shift) {
yading@10:     memset(c, 0, sizeof(TTAFilter));
yading@10:     if (s->format == FORMAT_ENCRYPTED) {
yading@10:         int i;
yading@10:         for (i = 0; i < 8; i++)
yading@10:             c->qm[i] = sign_extend(s->crc_pass[i], 8);
yading@10:     }
yading@10:     c->shift = shift;
yading@10:    c->round = shift_1[shift-1];
yading@10: //    c->round = 1 << (shift - 1);
yading@10: }
yading@10: 
yading@10: static inline void ttafilter_process(TTAFilter *c, int32_t *in)
yading@10: {
yading@10:     register int32_t *dl = c->dl, *qm = c->qm, *dx = c->dx, sum = c->round;
yading@10: 
yading@10:     if (c->error < 0) {
yading@10:         qm[0] -= dx[0]; qm[1] -= dx[1]; qm[2] -= dx[2]; qm[3] -= dx[3];
yading@10:         qm[4] -= dx[4]; qm[5] -= dx[5]; qm[6] -= dx[6]; qm[7] -= dx[7];
yading@10:     } else if (c->error > 0) {
yading@10:         qm[0] += dx[0]; qm[1] += dx[1]; qm[2] += dx[2]; qm[3] += dx[3];
yading@10:         qm[4] += dx[4]; qm[5] += dx[5]; qm[6] += dx[6]; qm[7] += dx[7];
yading@10:     }
yading@10: 
yading@10:     sum += dl[0] * qm[0] + dl[1] * qm[1] + dl[2] * qm[2] + dl[3] * qm[3] +
yading@10:            dl[4] * qm[4] + dl[5] * qm[5] + dl[6] * qm[6] + dl[7] * qm[7];
yading@10: 
yading@10:     dx[0] = dx[1]; dx[1] = dx[2]; dx[2] = dx[3]; dx[3] = dx[4];
yading@10:     dl[0] = dl[1]; dl[1] = dl[2]; dl[2] = dl[3]; dl[3] = dl[4];
yading@10: 
yading@10:     dx[4] = ((dl[4] >> 30) | 1);
yading@10:     dx[5] = ((dl[5] >> 30) | 2) & ~1;
yading@10:     dx[6] = ((dl[6] >> 30) | 2) & ~1;
yading@10:     dx[7] = ((dl[7] >> 30) | 4) & ~3;
yading@10: 
yading@10:     c->error = *in;
yading@10:     *in += (sum >> c->shift);
yading@10: 
yading@10:     dl[4] = -dl[5]; dl[5] = -dl[6];
yading@10:     dl[6] = *in - dl[7]; dl[7] = *in;
yading@10:     dl[5] += dl[6]; dl[4] += dl[5];
yading@10: }
yading@10: 
yading@10: static void rice_init(TTARice *c, uint32_t k0, uint32_t k1)
yading@10: {
yading@10:     c->k0 = k0;
yading@10:     c->k1 = k1;
yading@10:     c->sum0 = shift_16[k0];
yading@10:     c->sum1 = shift_16[k1];
yading@10: }
yading@10: 
yading@10: static int tta_get_unary(GetBitContext *gb)
yading@10: {
yading@10:     int ret = 0;
yading@10: 
yading@10:     // count ones
yading@10:     while (get_bits_left(gb) > 0 && get_bits1(gb))
yading@10:         ret++;
yading@10:     return ret;
yading@10: }
yading@10: 
yading@10: static const int64_t tta_channel_layouts[7] = {
yading@10:     AV_CH_LAYOUT_STEREO,
yading@10:     AV_CH_LAYOUT_STEREO|AV_CH_LOW_FREQUENCY,
yading@10:     AV_CH_LAYOUT_QUAD,
yading@10:     0,
yading@10:     AV_CH_LAYOUT_5POINT1_BACK,
yading@10:     AV_CH_LAYOUT_5POINT1_BACK|AV_CH_BACK_CENTER,
yading@10:     AV_CH_LAYOUT_7POINT1_WIDE
yading@10: };
yading@10: 
yading@10: static int tta_check_crc(TTAContext *s, const uint8_t *buf, int buf_size)
yading@10: {
yading@10:     uint32_t crc, CRC;
yading@10: 
yading@10:     CRC = AV_RL32(buf + buf_size);
yading@10:     crc = av_crc(s->crc_table, 0xFFFFFFFFU, buf, buf_size);
yading@10:     if (CRC != (crc ^ 0xFFFFFFFFU)) {
yading@10:         av_log(s->avctx, AV_LOG_ERROR, "CRC error\n");
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     }
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static uint64_t tta_check_crc64(uint8_t *pass)
yading@10: {
yading@10:     uint64_t crc = UINT64_MAX, poly = 0x42F0E1EBA9EA3693U;
yading@10:     uint8_t *end = pass + strlen(pass);
yading@10:     int i;
yading@10: 
yading@10:     while (pass < end) {
yading@10:         crc ^= (uint64_t)*pass++ << 56;
yading@10:         for (i = 0; i < 8; i++)
yading@10:             crc = (crc << 1) ^ (poly & (((int64_t) crc) >> 63));
yading@10:     }
yading@10: 
yading@10:     return crc ^ UINT64_MAX;
yading@10: }
yading@10: 
yading@10: static av_cold int tta_decode_init(AVCodecContext * avctx)
yading@10: {
yading@10:     TTAContext *s = avctx->priv_data;
yading@10:     int total_frames;
yading@10: 
yading@10:     s->avctx = avctx;
yading@10: 
yading@10:     // 30bytes includes a seektable with one frame
yading@10:     if (avctx->extradata_size < 30)
yading@10:         return AVERROR_INVALIDDATA;
yading@10: 
yading@10:     init_get_bits(&s->gb, avctx->extradata, avctx->extradata_size * 8);
yading@10:     if (show_bits_long(&s->gb, 32) == AV_RL32("TTA1"))
yading@10:     {
yading@10:         if (avctx->err_recognition & AV_EF_CRCCHECK) {
yading@10:             s->crc_table = av_crc_get_table(AV_CRC_32_IEEE_LE);
yading@10:             tta_check_crc(s, avctx->extradata, 18);
yading@10:         }
yading@10: 
yading@10:         /* signature */
yading@10:         skip_bits_long(&s->gb, 32);
yading@10: 
yading@10:         s->format = get_bits(&s->gb, 16);
yading@10:         if (s->format > 2) {
yading@10:             av_log(avctx, AV_LOG_ERROR, "Invalid format\n");
yading@10:             return AVERROR_INVALIDDATA;
yading@10:         }
yading@10:         if (s->format == FORMAT_ENCRYPTED) {
yading@10:             if (!s->pass) {
yading@10:                 av_log(avctx, AV_LOG_ERROR, "Missing password for encrypted stream. Please use the -password option\n");
yading@10:                 return AVERROR(EINVAL);
yading@10:             }
yading@10:             AV_WL64(s->crc_pass, tta_check_crc64(s->pass));
yading@10:         }
yading@10:         avctx->channels = s->channels = get_bits(&s->gb, 16);
yading@10:         if (s->channels > 1 && s->channels < 9)
yading@10:             avctx->channel_layout = tta_channel_layouts[s->channels-2];
yading@10:         avctx->bits_per_raw_sample = get_bits(&s->gb, 16);
yading@10:         s->bps = (avctx->bits_per_raw_sample + 7) / 8;
yading@10:         avctx->sample_rate = get_bits_long(&s->gb, 32);
yading@10:         s->data_length = get_bits_long(&s->gb, 32);
yading@10:         skip_bits_long(&s->gb, 32); // CRC32 of header
yading@10: 
yading@10:         if (s->channels == 0) {
yading@10:             av_log(avctx, AV_LOG_ERROR, "Invalid number of channels\n");
yading@10:             return AVERROR_INVALIDDATA;
yading@10:         } else if (avctx->sample_rate == 0) {
yading@10:             av_log(avctx, AV_LOG_ERROR, "Invalid samplerate\n");
yading@10:             return AVERROR_INVALIDDATA;
yading@10:         }
yading@10: 
yading@10:         switch(s->bps) {
yading@10:         case 1: avctx->sample_fmt = AV_SAMPLE_FMT_U8; break;
yading@10:         case 2:
yading@10:             avctx->sample_fmt = AV_SAMPLE_FMT_S16;
yading@10:             break;
yading@10:         case 3:
yading@10:             avctx->sample_fmt = AV_SAMPLE_FMT_S32;
yading@10:             break;
yading@10:         //case 4: avctx->sample_fmt = AV_SAMPLE_FMT_S32; break;
yading@10:         default:
yading@10:             av_log(avctx, AV_LOG_ERROR, "Invalid/unsupported sample format.\n");
yading@10:             return AVERROR_INVALIDDATA;
yading@10:         }
yading@10: 
yading@10:         // prevent overflow
yading@10:         if (avctx->sample_rate > 0x7FFFFFu) {
yading@10:             av_log(avctx, AV_LOG_ERROR, "sample_rate too large\n");
yading@10:             return AVERROR(EINVAL);
yading@10:         }
yading@10:         s->frame_length = 256 * avctx->sample_rate / 245;
yading@10: 
yading@10:         s->last_frame_length = s->data_length % s->frame_length;
yading@10:         total_frames = s->data_length / s->frame_length +
yading@10:                        (s->last_frame_length ? 1 : 0);
yading@10: 
yading@10:         av_log(avctx, AV_LOG_DEBUG, "format: %d chans: %d bps: %d rate: %d block: %d\n",
yading@10:             s->format, avctx->channels, avctx->bits_per_coded_sample, avctx->sample_rate,
yading@10:             avctx->block_align);
yading@10:         av_log(avctx, AV_LOG_DEBUG, "data_length: %d frame_length: %d last: %d total: %d\n",
yading@10:             s->data_length, s->frame_length, s->last_frame_length, total_frames);
yading@10: 
yading@10:         // FIXME: seek table
yading@10:         if (avctx->extradata_size <= 26 || total_frames > INT_MAX / 4 ||
yading@10:             avctx->extradata_size - 26 < total_frames * 4)
yading@10:             av_log(avctx, AV_LOG_WARNING, "Seek table missing or too small\n");
yading@10:         else if (avctx->err_recognition & AV_EF_CRCCHECK) {
yading@10:             if (tta_check_crc(s, avctx->extradata + 22, total_frames * 4))
yading@10:                 return AVERROR_INVALIDDATA;
yading@10:         }
yading@10:         skip_bits_long(&s->gb, 32 * total_frames);
yading@10:         skip_bits_long(&s->gb, 32); // CRC32 of seektable
yading@10: 
yading@10:         if(s->frame_length >= UINT_MAX / (s->channels * sizeof(int32_t))){
yading@10:             av_log(avctx, AV_LOG_ERROR, "frame_length too large\n");
yading@10:             return AVERROR_INVALIDDATA;
yading@10:         }
yading@10: 
yading@10:         if (s->bps < 3) {
yading@10:             s->decode_buffer = av_mallocz(sizeof(int32_t)*s->frame_length*s->channels);
yading@10:             if (!s->decode_buffer)
yading@10:                 return AVERROR(ENOMEM);
yading@10:         } else
yading@10:             s->decode_buffer = NULL;
yading@10:         s->ch_ctx = av_malloc(avctx->channels * sizeof(*s->ch_ctx));
yading@10:         if (!s->ch_ctx) {
yading@10:             av_freep(&s->decode_buffer);
yading@10:             return AVERROR(ENOMEM);
yading@10:         }
yading@10:     } else {
yading@10:         av_log(avctx, AV_LOG_ERROR, "Wrong extradata present\n");
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     }
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static int tta_decode_frame(AVCodecContext *avctx, void *data,
yading@10:                             int *got_frame_ptr, AVPacket *avpkt)
yading@10: {
yading@10:     AVFrame *frame     = data;
yading@10:     const uint8_t *buf = avpkt->data;
yading@10:     int buf_size = avpkt->size;
yading@10:     TTAContext *s = avctx->priv_data;
yading@10:     int i, ret;
yading@10:     int cur_chan = 0, framelen = s->frame_length;
yading@10:     int32_t *p;
yading@10: 
yading@10:     if (avctx->err_recognition & AV_EF_CRCCHECK) {
yading@10:         if (buf_size < 4 || tta_check_crc(s, buf, buf_size - 4))
yading@10:             return AVERROR_INVALIDDATA;
yading@10:     }
yading@10: 
yading@10:     init_get_bits(&s->gb, buf, buf_size*8);
yading@10: 
yading@10:     /* get output buffer */
yading@10:     frame->nb_samples = framelen;
yading@10:     if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
yading@10:         return ret;
yading@10: 
yading@10:     // decode directly to output buffer for 24-bit sample format
yading@10:     if (s->bps == 3)
yading@10:         s->decode_buffer = (int32_t *)frame->data[0];
yading@10: 
yading@10:     // init per channel states
yading@10:     for (i = 0; i < s->channels; i++) {
yading@10:         s->ch_ctx[i].predictor = 0;
yading@10:         ttafilter_init(s, &s->ch_ctx[i].filter, ttafilter_configs[s->bps-1]);
yading@10:         rice_init(&s->ch_ctx[i].rice, 10, 10);
yading@10:     }
yading@10: 
yading@10:     i = 0;
yading@10:     for (p = s->decode_buffer; p < s->decode_buffer + (framelen * s->channels); p++) {
yading@10:         int32_t *predictor = &s->ch_ctx[cur_chan].predictor;
yading@10:         TTAFilter *filter = &s->ch_ctx[cur_chan].filter;
yading@10:         TTARice *rice = &s->ch_ctx[cur_chan].rice;
yading@10:         uint32_t unary, depth, k;
yading@10:         int32_t value;
yading@10: 
yading@10:         unary = tta_get_unary(&s->gb);
yading@10: 
yading@10:         if (unary == 0) {
yading@10:             depth = 0;
yading@10:             k = rice->k0;
yading@10:         } else {
yading@10:             depth = 1;
yading@10:             k = rice->k1;
yading@10:             unary--;
yading@10:         }
yading@10: 
yading@10:         if (get_bits_left(&s->gb) < k) {
yading@10:             ret = AVERROR_INVALIDDATA;
yading@10:             goto error;
yading@10:         }
yading@10: 
yading@10:         if (k) {
yading@10:             if (k > MIN_CACHE_BITS) {
yading@10:                 ret = AVERROR_INVALIDDATA;
yading@10:                 goto error;
yading@10:             }
yading@10:             value = (unary << k) + get_bits(&s->gb, k);
yading@10:         } else
yading@10:             value = unary;
yading@10: 
yading@10:         // FIXME: copy paste from original
yading@10:         switch (depth) {
yading@10:         case 1:
yading@10:             rice->sum1 += value - (rice->sum1 >> 4);
yading@10:             if (rice->k1 > 0 && rice->sum1 < shift_16[rice->k1])
yading@10:                 rice->k1--;
yading@10:             else if(rice->sum1 > shift_16[rice->k1 + 1])
yading@10:                 rice->k1++;
yading@10:             value += shift_1[rice->k0];
yading@10:         default:
yading@10:             rice->sum0 += value - (rice->sum0 >> 4);
yading@10:             if (rice->k0 > 0 && rice->sum0 < shift_16[rice->k0])
yading@10:                 rice->k0--;
yading@10:             else if(rice->sum0 > shift_16[rice->k0 + 1])
yading@10:                 rice->k0++;
yading@10:         }
yading@10: 
yading@10:         // extract coded value
yading@10:         *p = 1 + ((value >> 1) ^ ((value & 1) - 1));
yading@10: 
yading@10:         // run hybrid filter
yading@10:         ttafilter_process(filter, p);
yading@10: 
yading@10:         // fixed order prediction
yading@10: #define PRED(x, k) (int32_t)((((uint64_t)x << k) - x) >> k)
yading@10:         switch (s->bps) {
yading@10:         case 1: *p += PRED(*predictor, 4); break;
yading@10:         case 2:
yading@10:         case 3: *p += PRED(*predictor, 5); break;
yading@10:         case 4: *p +=      *predictor;     break;
yading@10:         }
yading@10:         *predictor = *p;
yading@10: 
yading@10:         // flip channels
yading@10:         if (cur_chan < (s->channels-1))
yading@10:             cur_chan++;
yading@10:         else {
yading@10:             // decorrelate in case of multiple channels
yading@10:             if (s->channels > 1) {
yading@10:                 int32_t *r = p - 1;
yading@10:                 for (*p += *r / 2; r > p - s->channels; r--)
yading@10:                     *r = *(r + 1) - *r;
yading@10:             }
yading@10:             cur_chan = 0;
yading@10:             i++;
yading@10:             // check for last frame
yading@10:             if (i == s->last_frame_length && get_bits_left(&s->gb) / 8 == 4) {
yading@10:                 frame->nb_samples = framelen = s->last_frame_length;
yading@10:                 break;
yading@10:             }
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     align_get_bits(&s->gb);
yading@10:     if (get_bits_left(&s->gb) < 32) {
yading@10:         ret = AVERROR_INVALIDDATA;
yading@10:         goto error;
yading@10:     }
yading@10:     skip_bits_long(&s->gb, 32); // frame crc
yading@10: 
yading@10:     // convert to output buffer
yading@10:     switch (s->bps) {
yading@10:     case 1: {
yading@10:         uint8_t *samples = (uint8_t *)frame->data[0];
yading@10:         for (p = s->decode_buffer; p < s->decode_buffer + (framelen * s->channels); p++)
yading@10:             *samples++ = *p + 0x80;
yading@10:         break;
yading@10:         }
yading@10:     case 2: {
yading@10:         int16_t *samples = (int16_t *)frame->data[0];
yading@10:         for (p = s->decode_buffer; p < s->decode_buffer + (framelen * s->channels); p++)
yading@10:             *samples++ = *p;
yading@10:         break;
yading@10:         }
yading@10:     case 3: {
yading@10:         // shift samples for 24-bit sample format
yading@10:         int32_t *samples = (int32_t *)frame->data[0];
yading@10:         for (p = s->decode_buffer; p < s->decode_buffer + (framelen * s->channels); p++)
yading@10:             *samples++ <<= 8;
yading@10:         // reset decode buffer
yading@10:         s->decode_buffer = NULL;
yading@10:         break;
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     *got_frame_ptr = 1;
yading@10: 
yading@10:     return buf_size;
yading@10: error:
yading@10:     // reset decode buffer
yading@10:     if (s->bps == 3)
yading@10:         s->decode_buffer = NULL;
yading@10:     return ret;
yading@10: }
yading@10: 
yading@10: static av_cold int tta_decode_close(AVCodecContext *avctx) {
yading@10:     TTAContext *s = avctx->priv_data;
yading@10: 
yading@10:     if (s->bps < 3)
yading@10:         av_free(s->decode_buffer);
yading@10:     s->decode_buffer = NULL;
yading@10:     av_freep(&s->ch_ctx);
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: #define OFFSET(x) offsetof(TTAContext, x)
yading@10: #define DEC (AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_AUDIO_PARAM)
yading@10: static const AVOption options[] = {
yading@10:     { "password", "Set decoding password", OFFSET(pass), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, DEC },
yading@10:     { NULL },
yading@10: };
yading@10: 
yading@10: static const AVClass tta_decoder_class = {
yading@10:     .class_name = "TTA Decoder",
yading@10:     .item_name  = av_default_item_name,
yading@10:     .option     = options,
yading@10:     .version    = LIBAVUTIL_VERSION_INT,
yading@10: };
yading@10: 
yading@10: AVCodec ff_tta_decoder = {
yading@10:     .name           = "tta",
yading@10:     .type           = AVMEDIA_TYPE_AUDIO,
yading@10:     .id             = AV_CODEC_ID_TTA,
yading@10:     .priv_data_size = sizeof(TTAContext),
yading@10:     .init           = tta_decode_init,
yading@10:     .close          = tta_decode_close,
yading@10:     .decode         = tta_decode_frame,
yading@10:     .capabilities   = CODEC_CAP_DR1,
yading@10:     .long_name      = NULL_IF_CONFIG_SMALL("TTA (True Audio)"),
yading@10:     .priv_class     = &tta_decoder_class,
yading@10: };