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Diffstat (limited to 'contrib/ffmpeg/libavcodec/tta.c')
| -rw-r--r-- | contrib/ffmpeg/libavcodec/tta.c | 446 |
1 files changed, 0 insertions, 446 deletions
diff --git a/contrib/ffmpeg/libavcodec/tta.c b/contrib/ffmpeg/libavcodec/tta.c deleted file mode 100644 index 82713fb0f..000000000 --- a/contrib/ffmpeg/libavcodec/tta.c +++ /dev/null @@ -1,446 +0,0 @@ -/* - * TTA (The Lossless True Audio) decoder - * Copyright (c) 2006 Alex Beregszaszi - * - * 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 St, Fifth Floor, Boston, MA 02110-1301 USA - */ - -/** - * @file tta.c - * TTA (The Lossless True Audio) decoder - * (www.true-audio.com or tta.corecodec.org) - * @author Alex Beregszaszi - * - */ - -#define ALT_BITSTREAM_READER_LE -//#define DEBUG -#include <limits.h> -#include "avcodec.h" -#include "bitstream.h" - -#define FORMAT_INT 1 -#define FORMAT_FLOAT 3 - -typedef struct TTAContext { - AVCodecContext *avctx; - GetBitContext gb; - - int flags, channels, bps, is_float, data_length; - int frame_length, last_frame_length, total_frames; - - int32_t *decode_buffer; -} TTAContext; - -#if 0 -static inline int shift_1(int i) -{ - if (i < 32) - return 1 << i; - else - return 0x80000000; // 16 << 31 -} - -static inline int shift_16(int i) -{ - if (i < 28) - return 16 << i; - else - return 0x80000000; // 16 << 27 -} -#else -static const uint32_t shift_1[] = { - 0x00000001, 0x00000002, 0x00000004, 0x00000008, - 0x00000010, 0x00000020, 0x00000040, 0x00000080, - 0x00000100, 0x00000200, 0x00000400, 0x00000800, - 0x00001000, 0x00002000, 0x00004000, 0x00008000, - 0x00010000, 0x00020000, 0x00040000, 0x00080000, - 0x00100000, 0x00200000, 0x00400000, 0x00800000, - 0x01000000, 0x02000000, 0x04000000, 0x08000000, - 0x10000000, 0x20000000, 0x40000000, 0x80000000, - 0x80000000, 0x80000000, 0x80000000, 0x80000000, - 0x80000000, 0x80000000, 0x80000000, 0x80000000 -}; - -static const uint32_t *shift_16 = shift_1 + 4; -#endif - -#define MAX_ORDER 16 -typedef struct TTAFilter { - int32_t shift, round, error, mode; - int32_t qm[MAX_ORDER]; - int32_t dx[MAX_ORDER]; - int32_t dl[MAX_ORDER]; -} TTAFilter; - -static int32_t ttafilter_configs[4][2] = { - {10, 1}, - {9, 1}, - {10, 1}, - {12, 0} -}; - -static void ttafilter_init(TTAFilter *c, int32_t shift, int32_t mode) { - memset(c, 0, sizeof(TTAFilter)); - c->shift = shift; - c->round = shift_1[shift-1]; -// c->round = 1 << (shift - 1); - c->mode = mode; -} - -// FIXME: copy paste from original -static inline void memshl(register int32_t *a, register int32_t *b) { - *a++ = *b++; - *a++ = *b++; - *a++ = *b++; - *a++ = *b++; - *a++ = *b++; - *a++ = *b++; - *a++ = *b++; - *a = *b; -} - -// FIXME: copy paste from original -// mode=1 encoder, mode=0 decoder -static inline void ttafilter_process(TTAFilter *c, int32_t *in, int32_t mode) { - register int32_t *dl = c->dl, *qm = c->qm, *dx = c->dx, sum = c->round; - - if (!c->error) { - sum += *dl++ * *qm, qm++; - sum += *dl++ * *qm, qm++; - sum += *dl++ * *qm, qm++; - sum += *dl++ * *qm, qm++; - sum += *dl++ * *qm, qm++; - sum += *dl++ * *qm, qm++; - sum += *dl++ * *qm, qm++; - sum += *dl++ * *qm, qm++; - dx += 8; - } else if(c->error < 0) { - sum += *dl++ * (*qm -= *dx++), qm++; - sum += *dl++ * (*qm -= *dx++), qm++; - sum += *dl++ * (*qm -= *dx++), qm++; - sum += *dl++ * (*qm -= *dx++), qm++; - sum += *dl++ * (*qm -= *dx++), qm++; - sum += *dl++ * (*qm -= *dx++), qm++; - sum += *dl++ * (*qm -= *dx++), qm++; - sum += *dl++ * (*qm -= *dx++), qm++; - } else { - sum += *dl++ * (*qm += *dx++), qm++; - sum += *dl++ * (*qm += *dx++), qm++; - sum += *dl++ * (*qm += *dx++), qm++; - sum += *dl++ * (*qm += *dx++), qm++; - sum += *dl++ * (*qm += *dx++), qm++; - sum += *dl++ * (*qm += *dx++), qm++; - sum += *dl++ * (*qm += *dx++), qm++; - sum += *dl++ * (*qm += *dx++), qm++; - } - - *(dx-0) = ((*(dl-1) >> 30) | 1) << 2; - *(dx-1) = ((*(dl-2) >> 30) | 1) << 1; - *(dx-2) = ((*(dl-3) >> 30) | 1) << 1; - *(dx-3) = ((*(dl-4) >> 30) | 1); - - // compress - if (mode) { - *dl = *in; - *in -= (sum >> c->shift); - c->error = *in; - } else { - c->error = *in; - *in += (sum >> c->shift); - *dl = *in; - } - - if (c->mode) { - *(dl-1) = *dl - *(dl-1); - *(dl-2) = *(dl-1) - *(dl-2); - *(dl-3) = *(dl-2) - *(dl-3); - } - - memshl(c->dl, c->dl + 1); - memshl(c->dx, c->dx + 1); -} - -typedef struct TTARice { - uint32_t k0, k1, sum0, sum1; -} TTARice; - -static void rice_init(TTARice *c, uint32_t k0, uint32_t k1) -{ - c->k0 = k0; - c->k1 = k1; - c->sum0 = shift_16[k0]; - c->sum1 = shift_16[k1]; -} - -static int tta_get_unary(GetBitContext *gb) -{ - int ret = 0; - - // count ones - while(get_bits1(gb)) - ret++; - return ret; -} - -static int tta_decode_init(AVCodecContext * avctx) -{ - TTAContext *s = avctx->priv_data; - int i; - - s->avctx = avctx; - - // 30bytes includes a seektable with one frame - if (avctx->extradata_size < 30) - return -1; - - init_get_bits(&s->gb, avctx->extradata, avctx->extradata_size); - if (show_bits_long(&s->gb, 32) == ff_get_fourcc("TTA1")) - { - /* signature */ - skip_bits(&s->gb, 32); -// if (get_bits_long(&s->gb, 32) != bswap_32(ff_get_fourcc("TTA1"))) { -// av_log(s->avctx, AV_LOG_ERROR, "Missing magic\n"); -// return -1; -// } - - s->flags = get_bits(&s->gb, 16); - if (s->flags != 1 && s->flags != 3) - { - av_log(s->avctx, AV_LOG_ERROR, "Invalid flags\n"); - return -1; - } - s->is_float = (s->flags == FORMAT_FLOAT); - avctx->channels = s->channels = get_bits(&s->gb, 16); - avctx->bits_per_sample = get_bits(&s->gb, 16); - s->bps = (avctx->bits_per_sample + 7) / 8; - avctx->sample_rate = get_bits_long(&s->gb, 32); - if(avctx->sample_rate > 1000000){ //prevent FRAME_TIME * avctx->sample_rate from overflowing and sanity check - av_log(avctx, AV_LOG_ERROR, "sample_rate too large\n"); - return -1; - } - s->data_length = get_bits_long(&s->gb, 32); - skip_bits(&s->gb, 32); // CRC32 of header - - if (s->is_float) - { - avctx->sample_fmt = SAMPLE_FMT_FLT; - av_log(s->avctx, AV_LOG_ERROR, "Unsupported sample format. Please contact the developers.\n"); - return -1; - } - else switch(s->bps) { -// case 1: avctx->sample_fmt = SAMPLE_FMT_U8; break; - case 2: avctx->sample_fmt = SAMPLE_FMT_S16; break; -// case 3: avctx->sample_fmt = SAMPLE_FMT_S24; break; - case 4: avctx->sample_fmt = SAMPLE_FMT_S32; break; - default: - av_log(s->avctx, AV_LOG_ERROR, "Invalid/unsupported sample format. Please contact the developers.\n"); - return -1; - } - - // FIXME: horribly broken, but directly from reference source -#define FRAME_TIME 1.04489795918367346939 - s->frame_length = (int)(FRAME_TIME * avctx->sample_rate); - - s->last_frame_length = s->data_length % s->frame_length; - s->total_frames = s->data_length / s->frame_length + - (s->last_frame_length ? 1 : 0); - - av_log(s->avctx, AV_LOG_DEBUG, "flags: %x chans: %d bps: %d rate: %d block: %d\n", - s->flags, avctx->channels, avctx->bits_per_sample, avctx->sample_rate, - avctx->block_align); - av_log(s->avctx, AV_LOG_DEBUG, "data_length: %d frame_length: %d last: %d total: %d\n", - s->data_length, s->frame_length, s->last_frame_length, s->total_frames); - - // FIXME: seek table - for (i = 0; i < s->total_frames; i++) - skip_bits(&s->gb, 32); - skip_bits(&s->gb, 32); // CRC32 of seektable - - if(s->frame_length >= UINT_MAX / (s->channels * sizeof(int32_t))){ - av_log(avctx, AV_LOG_ERROR, "frame_length too large\n"); - return -1; - } - - s->decode_buffer = av_mallocz(sizeof(int32_t)*s->frame_length*s->channels); - } else { - av_log(avctx, AV_LOG_ERROR, "Wrong extradata present\n"); - return -1; - } - - return 0; -} - -static int tta_decode_frame(AVCodecContext *avctx, - void *data, int *data_size, - uint8_t *buf, int buf_size) -{ - TTAContext *s = avctx->priv_data; - int i; - - init_get_bits(&s->gb, buf, buf_size*8); - { - int32_t predictors[s->channels]; - TTAFilter filters[s->channels]; - TTARice rices[s->channels]; - int cur_chan = 0, framelen = s->frame_length; - int32_t *p; - - // FIXME: seeking - s->total_frames--; - if (!s->total_frames && s->last_frame_length) - framelen = s->last_frame_length; - - // init per channel states - for (i = 0; i < s->channels; i++) { - predictors[i] = 0; - ttafilter_init(&(filters[i]), ttafilter_configs[s->bps-1][0], ttafilter_configs[s->bps-1][1]); - rice_init(&(rices[i]), 10, 10); - } - - for (p = s->decode_buffer; p < s->decode_buffer + (framelen * s->channels); p++) { - int32_t *predictor = &(predictors[cur_chan]); - TTAFilter *filter = &(filters[cur_chan]); - TTARice *rice = &(rices[cur_chan]); - uint32_t unary, depth, k; - int32_t value; - - unary = tta_get_unary(&s->gb); - - if (unary == 0) { - depth = 0; - k = rice->k0; - } else { - depth = 1; - k = rice->k1; - unary--; - } - - if (k) - value = (unary << k) + get_bits(&s->gb, k); - else - value = unary; - - // FIXME: copy paste from original - switch (depth) { - case 1: - rice->sum1 += value - (rice->sum1 >> 4); - if (rice->k1 > 0 && rice->sum1 < shift_16[rice->k1]) - rice->k1--; - else if(rice->sum1 > shift_16[rice->k1 + 1]) - rice->k1++; - value += shift_1[rice->k0]; - default: - rice->sum0 += value - (rice->sum0 >> 4); - if (rice->k0 > 0 && rice->sum0 < shift_16[rice->k0]) - rice->k0--; - else if(rice->sum0 > shift_16[rice->k0 + 1]) - rice->k0++; - } - - // extract coded value -#define UNFOLD(x) (((x)&1) ? (++(x)>>1) : (-(x)>>1)) - *p = UNFOLD(value); - - // run hybrid filter - ttafilter_process(filter, p, 0); - - // fixed order prediction -#define PRED(x, k) (int32_t)((((uint64_t)x << k) - x) >> k) - switch (s->bps) { - case 1: *p += PRED(*predictor, 4); break; - case 2: - case 3: *p += PRED(*predictor, 5); break; - case 4: *p += *predictor; break; - } - *predictor = *p; - -#if 0 - // extract 32bit float from last two int samples - if (s->is_float && ((p - data) & 1)) { - uint32_t neg = *p & 0x80000000; - uint32_t hi = *(p - 1); - uint32_t lo = abs(*p) - 1; - - hi += (hi || lo) ? 0x3f80 : 0; - // SWAP16: swap all the 16 bits - *(p - 1) = (hi << 16) | SWAP16(lo) | neg; - } -#endif - - /*if ((get_bits_count(&s->gb)+7)/8 > buf_size) - { - av_log(NULL, AV_LOG_INFO, "overread!!\n"); - break; - }*/ - - // flip channels - if (cur_chan < (s->channels-1)) - cur_chan++; - else { - // decorrelate in case of stereo integer - if (!s->is_float && (s->channels > 1)) { - int32_t *r = p - 1; - for (*p += *r / 2; r > p - s->channels; r--) - *r = *(r + 1) - *r; - } - cur_chan = 0; - } - } - - skip_bits(&s->gb, 32); // frame crc - - // convert to output buffer - switch(s->bps) { - case 2: { - uint16_t *samples = data; - for (p = s->decode_buffer; p < s->decode_buffer + (framelen * s->channels); p++) { -// *samples++ = (unsigned char)*p; -// *samples++ = (unsigned char)(*p >> 8); - *samples++ = *p; - } - *data_size = (uint8_t *)samples - (uint8_t *)data; - break; - } - default: - av_log(s->avctx, AV_LOG_ERROR, "Error, only 16bit samples supported!\n"); - } - } - -// return get_bits_count(&s->gb)+7)/8; - return buf_size; -} - -static int tta_decode_close(AVCodecContext *avctx) { - TTAContext *s = avctx->priv_data; - - if (s->decode_buffer) - av_free(s->decode_buffer); - - return 0; -} - -AVCodec tta_decoder = { - "tta", - CODEC_TYPE_AUDIO, - CODEC_ID_TTA, - sizeof(TTAContext), - tta_decode_init, - NULL, - tta_decode_close, - tta_decode_frame, -}; |