diff options
Diffstat (limited to 'ffmpeg1/libavcodec/tta.c')
| -rw-r--r-- | ffmpeg1/libavcodec/tta.c | 515 |
1 files changed, 0 insertions, 515 deletions
diff --git a/ffmpeg1/libavcodec/tta.c b/ffmpeg1/libavcodec/tta.c deleted file mode 100644 index 8b4ca5a..0000000 --- a/ffmpeg1/libavcodec/tta.c +++ /dev/null @@ -1,515 +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 Street, Fifth Floor, Boston, MA 02110-1301 USA - */ - -/** - * @file - * TTA (The Lossless True Audio) decoder - * @see http://www.true-audio.com/ - * @see http://tta.corecodec.org/ - * @author Alex Beregszaszi - */ - -#define BITSTREAM_READER_LE -//#define DEBUG -#include <limits.h> -#include "avcodec.h" -#include "get_bits.h" -#include "internal.h" -#include "libavutil/crc.h" -#include "libavutil/intreadwrite.h" -#include "libavutil/opt.h" - -#define FORMAT_SIMPLE 1 -#define FORMAT_ENCRYPTED 2 - -#define MAX_ORDER 16 -typedef struct TTAFilter { - int32_t shift, round, error; - int32_t qm[MAX_ORDER]; - int32_t dx[MAX_ORDER]; - int32_t dl[MAX_ORDER]; -} TTAFilter; - -typedef struct TTARice { - uint32_t k0, k1, sum0, sum1; -} TTARice; - -typedef struct TTAChannel { - int32_t predictor; - TTAFilter filter; - TTARice rice; -} TTAChannel; - -typedef struct TTAContext { - AVClass *class; - AVCodecContext *avctx; - GetBitContext gb; - const AVCRC *crc_table; - - int format, channels, bps; - unsigned data_length; - int frame_length, last_frame_length; - - int32_t *decode_buffer; - - uint8_t crc_pass[8]; - uint8_t *pass; - TTAChannel *ch_ctx; -} TTAContext; - -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 * const shift_16 = shift_1 + 4; - -static const int32_t ttafilter_configs[4] = { - 10, - 9, - 10, - 12 -}; - -static void ttafilter_init(TTAContext *s, TTAFilter *c, int32_t shift) { - memset(c, 0, sizeof(TTAFilter)); - if (s->format == FORMAT_ENCRYPTED) { - int i; - for (i = 0; i < 8; i++) - c->qm[i] = sign_extend(s->crc_pass[i], 8); - } - c->shift = shift; - c->round = shift_1[shift-1]; -// c->round = 1 << (shift - 1); -} - -static inline void ttafilter_process(TTAFilter *c, int32_t *in) -{ - register int32_t *dl = c->dl, *qm = c->qm, *dx = c->dx, sum = c->round; - - if (c->error < 0) { - qm[0] -= dx[0]; qm[1] -= dx[1]; qm[2] -= dx[2]; qm[3] -= dx[3]; - qm[4] -= dx[4]; qm[5] -= dx[5]; qm[6] -= dx[6]; qm[7] -= dx[7]; - } else if (c->error > 0) { - qm[0] += dx[0]; qm[1] += dx[1]; qm[2] += dx[2]; qm[3] += dx[3]; - qm[4] += dx[4]; qm[5] += dx[5]; qm[6] += dx[6]; qm[7] += dx[7]; - } - - sum += dl[0] * qm[0] + dl[1] * qm[1] + dl[2] * qm[2] + dl[3] * qm[3] + - dl[4] * qm[4] + dl[5] * qm[5] + dl[6] * qm[6] + dl[7] * qm[7]; - - dx[0] = dx[1]; dx[1] = dx[2]; dx[2] = dx[3]; dx[3] = dx[4]; - dl[0] = dl[1]; dl[1] = dl[2]; dl[2] = dl[3]; dl[3] = dl[4]; - - dx[4] = ((dl[4] >> 30) | 1); - dx[5] = ((dl[5] >> 30) | 2) & ~1; - dx[6] = ((dl[6] >> 30) | 2) & ~1; - dx[7] = ((dl[7] >> 30) | 4) & ~3; - - c->error = *in; - *in += (sum >> c->shift); - - dl[4] = -dl[5]; dl[5] = -dl[6]; - dl[6] = *in - dl[7]; dl[7] = *in; - dl[5] += dl[6]; dl[4] += dl[5]; -} - -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_bits_left(gb) > 0 && get_bits1(gb)) - ret++; - return ret; -} - -static const int64_t tta_channel_layouts[7] = { - AV_CH_LAYOUT_STEREO, - AV_CH_LAYOUT_STEREO|AV_CH_LOW_FREQUENCY, - AV_CH_LAYOUT_QUAD, - 0, - AV_CH_LAYOUT_5POINT1_BACK, - AV_CH_LAYOUT_5POINT1_BACK|AV_CH_BACK_CENTER, - AV_CH_LAYOUT_7POINT1_WIDE -}; - -static int tta_check_crc(TTAContext *s, const uint8_t *buf, int buf_size) -{ - uint32_t crc, CRC; - - CRC = AV_RL32(buf + buf_size); - crc = av_crc(s->crc_table, 0xFFFFFFFFU, buf, buf_size); - if (CRC != (crc ^ 0xFFFFFFFFU)) { - av_log(s->avctx, AV_LOG_ERROR, "CRC error\n"); - return AVERROR_INVALIDDATA; - } - - return 0; -} - -static uint64_t tta_check_crc64(uint8_t *pass) -{ - uint64_t crc = UINT64_MAX, poly = 0x42F0E1EBA9EA3693U; - uint8_t *end = pass + strlen(pass); - int i; - - while (pass < end) { - crc ^= (uint64_t)*pass++ << 56; - for (i = 0; i < 8; i++) - crc = (crc << 1) ^ (poly & (((int64_t) crc) >> 63)); - } - - return crc ^ UINT64_MAX; -} - -static av_cold int tta_decode_init(AVCodecContext * avctx) -{ - TTAContext *s = avctx->priv_data; - int total_frames; - - s->avctx = avctx; - - // 30bytes includes a seektable with one frame - if (avctx->extradata_size < 30) - return AVERROR_INVALIDDATA; - - init_get_bits(&s->gb, avctx->extradata, avctx->extradata_size * 8); - if (show_bits_long(&s->gb, 32) == AV_RL32("TTA1")) - { - if (avctx->err_recognition & AV_EF_CRCCHECK) { - s->crc_table = av_crc_get_table(AV_CRC_32_IEEE_LE); - tta_check_crc(s, avctx->extradata, 18); - } - - /* signature */ - skip_bits_long(&s->gb, 32); - - s->format = get_bits(&s->gb, 16); - if (s->format > 2) { - av_log(avctx, AV_LOG_ERROR, "Invalid format\n"); - return AVERROR_INVALIDDATA; - } - if (s->format == FORMAT_ENCRYPTED) { - if (!s->pass) { - av_log(avctx, AV_LOG_ERROR, "Missing password for encrypted stream. Please use the -password option\n"); - return AVERROR(EINVAL); - } - AV_WL64(s->crc_pass, tta_check_crc64(s->pass)); - } - avctx->channels = s->channels = get_bits(&s->gb, 16); - if (s->channels > 1 && s->channels < 9) - avctx->channel_layout = tta_channel_layouts[s->channels-2]; - avctx->bits_per_raw_sample = get_bits(&s->gb, 16); - s->bps = (avctx->bits_per_raw_sample + 7) / 8; - avctx->sample_rate = get_bits_long(&s->gb, 32); - s->data_length = get_bits_long(&s->gb, 32); - skip_bits_long(&s->gb, 32); // CRC32 of header - - if (s->channels == 0) { - av_log(avctx, AV_LOG_ERROR, "Invalid number of channels\n"); - return AVERROR_INVALIDDATA; - } else if (avctx->sample_rate == 0) { - av_log(avctx, AV_LOG_ERROR, "Invalid samplerate\n"); - return AVERROR_INVALIDDATA; - } - - switch(s->bps) { - case 1: avctx->sample_fmt = AV_SAMPLE_FMT_U8; break; - case 2: - avctx->sample_fmt = AV_SAMPLE_FMT_S16; - break; - case 3: - avctx->sample_fmt = AV_SAMPLE_FMT_S32; - break; - //case 4: avctx->sample_fmt = AV_SAMPLE_FMT_S32; break; - default: - av_log(avctx, AV_LOG_ERROR, "Invalid/unsupported sample format.\n"); - return AVERROR_INVALIDDATA; - } - - // prevent overflow - if (avctx->sample_rate > 0x7FFFFFu) { - av_log(avctx, AV_LOG_ERROR, "sample_rate too large\n"); - return AVERROR(EINVAL); - } - s->frame_length = 256 * avctx->sample_rate / 245; - - s->last_frame_length = s->data_length % s->frame_length; - total_frames = s->data_length / s->frame_length + - (s->last_frame_length ? 1 : 0); - - av_log(avctx, AV_LOG_DEBUG, "format: %d chans: %d bps: %d rate: %d block: %d\n", - s->format, avctx->channels, avctx->bits_per_coded_sample, avctx->sample_rate, - avctx->block_align); - av_log(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, total_frames); - - // FIXME: seek table - if (avctx->extradata_size <= 26 || total_frames > INT_MAX / 4 || - avctx->extradata_size - 26 < total_frames * 4) - av_log(avctx, AV_LOG_WARNING, "Seek table missing or too small\n"); - else if (avctx->err_recognition & AV_EF_CRCCHECK) { - if (tta_check_crc(s, avctx->extradata + 22, total_frames * 4)) - return AVERROR_INVALIDDATA; - } - skip_bits_long(&s->gb, 32 * total_frames); - skip_bits_long(&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 AVERROR_INVALIDDATA; - } - - if (s->bps < 3) { - s->decode_buffer = av_mallocz(sizeof(int32_t)*s->frame_length*s->channels); - if (!s->decode_buffer) - return AVERROR(ENOMEM); - } else - s->decode_buffer = NULL; - s->ch_ctx = av_malloc(avctx->channels * sizeof(*s->ch_ctx)); - if (!s->ch_ctx) { - av_freep(&s->decode_buffer); - return AVERROR(ENOMEM); - } - } else { - av_log(avctx, AV_LOG_ERROR, "Wrong extradata present\n"); - return AVERROR_INVALIDDATA; - } - - return 0; -} - -static int tta_decode_frame(AVCodecContext *avctx, void *data, - int *got_frame_ptr, AVPacket *avpkt) -{ - AVFrame *frame = data; - const uint8_t *buf = avpkt->data; - int buf_size = avpkt->size; - TTAContext *s = avctx->priv_data; - int i, ret; - int cur_chan = 0, framelen = s->frame_length; - int32_t *p; - - if (avctx->err_recognition & AV_EF_CRCCHECK) { - if (buf_size < 4 || tta_check_crc(s, buf, buf_size - 4)) - return AVERROR_INVALIDDATA; - } - - init_get_bits(&s->gb, buf, buf_size*8); - - /* get output buffer */ - frame->nb_samples = framelen; - if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) - return ret; - - // decode directly to output buffer for 24-bit sample format - if (s->bps == 3) - s->decode_buffer = (int32_t *)frame->data[0]; - - // init per channel states - for (i = 0; i < s->channels; i++) { - s->ch_ctx[i].predictor = 0; - ttafilter_init(s, &s->ch_ctx[i].filter, ttafilter_configs[s->bps-1]); - rice_init(&s->ch_ctx[i].rice, 10, 10); - } - - i = 0; - for (p = s->decode_buffer; p < s->decode_buffer + (framelen * s->channels); p++) { - int32_t *predictor = &s->ch_ctx[cur_chan].predictor; - TTAFilter *filter = &s->ch_ctx[cur_chan].filter; - TTARice *rice = &s->ch_ctx[cur_chan].rice; - 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 (get_bits_left(&s->gb) < k) { - ret = AVERROR_INVALIDDATA; - goto error; - } - - if (k) { - if (k > MIN_CACHE_BITS) { - ret = AVERROR_INVALIDDATA; - goto error; - } - 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 - *p = 1 + ((value >> 1) ^ ((value & 1) - 1)); - - // run hybrid filter - ttafilter_process(filter, p); - - // 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; - - // flip channels - if (cur_chan < (s->channels-1)) - cur_chan++; - else { - // decorrelate in case of multiple channels - if (s->channels > 1) { - int32_t *r = p - 1; - for (*p += *r / 2; r > p - s->channels; r--) - *r = *(r + 1) - *r; - } - cur_chan = 0; - i++; - // check for last frame - if (i == s->last_frame_length && get_bits_left(&s->gb) / 8 == 4) { - frame->nb_samples = framelen = s->last_frame_length; - break; - } - } - } - - align_get_bits(&s->gb); - if (get_bits_left(&s->gb) < 32) { - ret = AVERROR_INVALIDDATA; - goto error; - } - skip_bits_long(&s->gb, 32); // frame crc - - // convert to output buffer - switch (s->bps) { - case 1: { - uint8_t *samples = (uint8_t *)frame->data[0]; - for (p = s->decode_buffer; p < s->decode_buffer + (framelen * s->channels); p++) - *samples++ = *p + 0x80; - break; - } - case 2: { - int16_t *samples = (int16_t *)frame->data[0]; - for (p = s->decode_buffer; p < s->decode_buffer + (framelen * s->channels); p++) - *samples++ = *p; - break; - } - case 3: { - // shift samples for 24-bit sample format - int32_t *samples = (int32_t *)frame->data[0]; - for (p = s->decode_buffer; p < s->decode_buffer + (framelen * s->channels); p++) - *samples++ <<= 8; - // reset decode buffer - s->decode_buffer = NULL; - break; - } - } - - *got_frame_ptr = 1; - - return buf_size; -error: - // reset decode buffer - if (s->bps == 3) - s->decode_buffer = NULL; - return ret; -} - -static av_cold int tta_decode_close(AVCodecContext *avctx) { - TTAContext *s = avctx->priv_data; - - if (s->bps < 3) - av_free(s->decode_buffer); - s->decode_buffer = NULL; - av_freep(&s->ch_ctx); - - return 0; -} - -#define OFFSET(x) offsetof(TTAContext, x) -#define DEC (AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_AUDIO_PARAM) -static const AVOption options[] = { - { "password", "Set decoding password", OFFSET(pass), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, DEC }, - { NULL }, -}; - -static const AVClass tta_decoder_class = { - .class_name = "TTA Decoder", - .item_name = av_default_item_name, - .option = options, - .version = LIBAVUTIL_VERSION_INT, -}; - -AVCodec ff_tta_decoder = { - .name = "tta", - .type = AVMEDIA_TYPE_AUDIO, - .id = AV_CODEC_ID_TTA, - .priv_data_size = sizeof(TTAContext), - .init = tta_decode_init, - .close = tta_decode_close, - .decode = tta_decode_frame, - .capabilities = CODEC_CAP_DR1, - .long_name = NULL_IF_CONFIG_SMALL("TTA (True Audio)"), - .priv_class = &tta_decoder_class, -}; |