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1 | /* |
2 | * TTA (The Lossless True Audio) decoder | |
3 | * Copyright (c) 2006 Alex Beregszaszi | |
4 | * | |
5 | * This file is part of FFmpeg. | |
6 | * | |
7 | * FFmpeg is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU Lesser General Public | |
9 | * License as published by the Free Software Foundation; either | |
10 | * version 2.1 of the License, or (at your option) any later version. | |
11 | * | |
12 | * FFmpeg is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | * Lesser General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU Lesser General Public | |
18 | * License along with FFmpeg; if not, write to the Free Software | |
19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
20 | */ | |
21 | ||
22 | /** | |
23 | * @file | |
24 | * TTA (The Lossless True Audio) decoder | |
25 | * @see http://www.true-audio.com/ | |
26 | * @see http://tta.corecodec.org/ | |
27 | * @author Alex Beregszaszi | |
28 | */ | |
29 | ||
30 | #define BITSTREAM_READER_LE | |
31 | #include <limits.h> | |
32 | #include "ttadata.h" | |
33 | #include "ttadsp.h" | |
34 | #include "avcodec.h" | |
35 | #include "get_bits.h" | |
36 | #include "thread.h" | |
37 | #include "unary.h" | |
38 | #include "internal.h" | |
39 | #include "libavutil/crc.h" | |
40 | #include "libavutil/intreadwrite.h" | |
41 | #include "libavutil/opt.h" | |
42 | ||
43 | #define FORMAT_SIMPLE 1 | |
44 | #define FORMAT_ENCRYPTED 2 | |
45 | ||
46 | typedef struct TTAContext { | |
47 | AVClass *class; | |
48 | AVCodecContext *avctx; | |
49 | const AVCRC *crc_table; | |
50 | ||
51 | int format, channels, bps; | |
52 | unsigned data_length; | |
53 | int frame_length, last_frame_length; | |
54 | ||
55 | int32_t *decode_buffer; | |
56 | ||
57 | uint8_t crc_pass[8]; | |
58 | uint8_t *pass; | |
59 | TTAChannel *ch_ctx; | |
60 | TTADSPContext dsp; | |
61 | } TTAContext; | |
62 | ||
63 | static const int64_t tta_channel_layouts[7] = { | |
64 | AV_CH_LAYOUT_STEREO, | |
65 | AV_CH_LAYOUT_STEREO|AV_CH_LOW_FREQUENCY, | |
66 | AV_CH_LAYOUT_QUAD, | |
67 | 0, | |
68 | AV_CH_LAYOUT_5POINT1_BACK, | |
69 | AV_CH_LAYOUT_5POINT1_BACK|AV_CH_BACK_CENTER, | |
70 | AV_CH_LAYOUT_7POINT1_WIDE | |
71 | }; | |
72 | ||
73 | static int tta_check_crc(TTAContext *s, const uint8_t *buf, int buf_size) | |
74 | { | |
75 | uint32_t crc, CRC; | |
76 | ||
77 | CRC = AV_RL32(buf + buf_size); | |
78 | crc = av_crc(s->crc_table, 0xFFFFFFFFU, buf, buf_size); | |
79 | if (CRC != (crc ^ 0xFFFFFFFFU)) { | |
80 | av_log(s->avctx, AV_LOG_ERROR, "CRC error\n"); | |
81 | return AVERROR_INVALIDDATA; | |
82 | } | |
83 | ||
84 | return 0; | |
85 | } | |
86 | ||
87 | static uint64_t tta_check_crc64(uint8_t *pass) | |
88 | { | |
89 | uint64_t crc = UINT64_MAX, poly = 0x42F0E1EBA9EA3693U; | |
90 | uint8_t *end = pass + strlen(pass); | |
91 | int i; | |
92 | ||
93 | while (pass < end) { | |
94 | crc ^= (uint64_t)*pass++ << 56; | |
95 | for (i = 0; i < 8; i++) | |
96 | crc = (crc << 1) ^ (poly & (((int64_t) crc) >> 63)); | |
97 | } | |
98 | ||
99 | return crc ^ UINT64_MAX; | |
100 | } | |
101 | ||
102 | static int allocate_buffers(AVCodecContext *avctx) | |
103 | { | |
104 | TTAContext *s = avctx->priv_data; | |
105 | ||
106 | if (s->bps < 3) { | |
107 | s->decode_buffer = av_mallocz_array(sizeof(int32_t)*s->frame_length, s->channels); | |
108 | if (!s->decode_buffer) | |
109 | return AVERROR(ENOMEM); | |
110 | } else | |
111 | s->decode_buffer = NULL; | |
112 | s->ch_ctx = av_malloc_array(avctx->channels, sizeof(*s->ch_ctx)); | |
113 | if (!s->ch_ctx) { | |
114 | av_freep(&s->decode_buffer); | |
115 | return AVERROR(ENOMEM); | |
116 | } | |
117 | ||
118 | return 0; | |
119 | } | |
120 | ||
121 | static av_cold int tta_decode_init(AVCodecContext * avctx) | |
122 | { | |
123 | TTAContext *s = avctx->priv_data; | |
124 | GetBitContext gb; | |
125 | int total_frames; | |
126 | ||
127 | s->avctx = avctx; | |
128 | ||
129 | // 30bytes includes TTA1 header | |
130 | if (avctx->extradata_size < 22) | |
131 | return AVERROR_INVALIDDATA; | |
132 | ||
133 | s->crc_table = av_crc_get_table(AV_CRC_32_IEEE_LE); | |
134 | init_get_bits8(&gb, avctx->extradata, avctx->extradata_size); | |
135 | if (show_bits_long(&gb, 32) == AV_RL32("TTA1")) { | |
136 | /* signature */ | |
137 | skip_bits_long(&gb, 32); | |
138 | ||
139 | s->format = get_bits(&gb, 16); | |
140 | if (s->format > 2) { | |
141 | av_log(avctx, AV_LOG_ERROR, "Invalid format\n"); | |
142 | return AVERROR_INVALIDDATA; | |
143 | } | |
144 | if (s->format == FORMAT_ENCRYPTED) { | |
145 | if (!s->pass) { | |
146 | av_log(avctx, AV_LOG_ERROR, "Missing password for encrypted stream. Please use the -password option\n"); | |
147 | return AVERROR(EINVAL); | |
148 | } | |
149 | AV_WL64(s->crc_pass, tta_check_crc64(s->pass)); | |
150 | } | |
151 | avctx->channels = s->channels = get_bits(&gb, 16); | |
152 | if (s->channels > 1 && s->channels < 9) | |
153 | avctx->channel_layout = tta_channel_layouts[s->channels-2]; | |
154 | avctx->bits_per_raw_sample = get_bits(&gb, 16); | |
155 | s->bps = (avctx->bits_per_raw_sample + 7) / 8; | |
156 | avctx->sample_rate = get_bits_long(&gb, 32); | |
157 | s->data_length = get_bits_long(&gb, 32); | |
158 | skip_bits_long(&gb, 32); // CRC32 of header | |
159 | ||
160 | if (s->channels == 0) { | |
161 | av_log(avctx, AV_LOG_ERROR, "Invalid number of channels\n"); | |
162 | return AVERROR_INVALIDDATA; | |
163 | } else if (avctx->sample_rate == 0) { | |
164 | av_log(avctx, AV_LOG_ERROR, "Invalid samplerate\n"); | |
165 | return AVERROR_INVALIDDATA; | |
166 | } | |
167 | ||
168 | switch(s->bps) { | |
169 | case 1: avctx->sample_fmt = AV_SAMPLE_FMT_U8; break; | |
170 | case 2: | |
171 | avctx->sample_fmt = AV_SAMPLE_FMT_S16; | |
172 | break; | |
173 | case 3: | |
174 | avctx->sample_fmt = AV_SAMPLE_FMT_S32; | |
175 | break; | |
176 | //case 4: avctx->sample_fmt = AV_SAMPLE_FMT_S32; break; | |
177 | default: | |
178 | av_log(avctx, AV_LOG_ERROR, "Invalid/unsupported sample format.\n"); | |
179 | return AVERROR_INVALIDDATA; | |
180 | } | |
181 | ||
182 | // prevent overflow | |
183 | if (avctx->sample_rate > 0x7FFFFFu) { | |
184 | av_log(avctx, AV_LOG_ERROR, "sample_rate too large\n"); | |
185 | return AVERROR(EINVAL); | |
186 | } | |
187 | s->frame_length = 256 * avctx->sample_rate / 245; | |
188 | ||
189 | s->last_frame_length = s->data_length % s->frame_length; | |
190 | total_frames = s->data_length / s->frame_length + | |
191 | (s->last_frame_length ? 1 : 0); | |
192 | ||
193 | av_log(avctx, AV_LOG_DEBUG, "format: %d chans: %d bps: %d rate: %d block: %d\n", | |
194 | s->format, avctx->channels, avctx->bits_per_coded_sample, avctx->sample_rate, | |
195 | avctx->block_align); | |
196 | av_log(avctx, AV_LOG_DEBUG, "data_length: %d frame_length: %d last: %d total: %d\n", | |
197 | s->data_length, s->frame_length, s->last_frame_length, total_frames); | |
198 | ||
199 | if(s->frame_length >= UINT_MAX / (s->channels * sizeof(int32_t))){ | |
200 | av_log(avctx, AV_LOG_ERROR, "frame_length too large\n"); | |
201 | return AVERROR_INVALIDDATA; | |
202 | } | |
203 | } else { | |
204 | av_log(avctx, AV_LOG_ERROR, "Wrong extradata present\n"); | |
205 | return AVERROR_INVALIDDATA; | |
206 | } | |
207 | ||
208 | ff_ttadsp_init(&s->dsp); | |
209 | ||
210 | return allocate_buffers(avctx); | |
211 | } | |
212 | ||
213 | static int tta_decode_frame(AVCodecContext *avctx, void *data, | |
214 | int *got_frame_ptr, AVPacket *avpkt) | |
215 | { | |
216 | AVFrame *frame = data; | |
217 | ThreadFrame tframe = { .f = data }; | |
218 | const uint8_t *buf = avpkt->data; | |
219 | int buf_size = avpkt->size; | |
220 | TTAContext *s = avctx->priv_data; | |
221 | GetBitContext gb; | |
222 | int i, ret; | |
223 | int cur_chan = 0, framelen = s->frame_length; | |
224 | int32_t *p; | |
225 | ||
226 | if (avctx->err_recognition & AV_EF_CRCCHECK) { | |
227 | if (buf_size < 4 || | |
228 | (tta_check_crc(s, buf, buf_size - 4) && avctx->err_recognition & AV_EF_EXPLODE)) | |
229 | return AVERROR_INVALIDDATA; | |
230 | } | |
231 | ||
232 | if ((ret = init_get_bits8(&gb, avpkt->data, avpkt->size)) < 0) | |
233 | return ret; | |
234 | ||
235 | /* get output buffer */ | |
236 | frame->nb_samples = framelen; | |
237 | if ((ret = ff_thread_get_buffer(avctx, &tframe, 0)) < 0) | |
238 | return ret; | |
239 | ||
240 | // decode directly to output buffer for 24-bit sample format | |
241 | if (s->bps == 3) | |
242 | s->decode_buffer = (int32_t *)frame->data[0]; | |
243 | ||
244 | // init per channel states | |
245 | for (i = 0; i < s->channels; i++) { | |
246 | TTAFilter *filter = &s->ch_ctx[i].filter; | |
247 | s->ch_ctx[i].predictor = 0; | |
248 | ff_tta_filter_init(filter, ff_tta_filter_configs[s->bps-1]); | |
249 | if (s->format == FORMAT_ENCRYPTED) { | |
250 | int i; | |
251 | for (i = 0; i < 8; i++) | |
252 | filter->qm[i] = sign_extend(s->crc_pass[i], 8); | |
253 | } | |
254 | ff_tta_rice_init(&s->ch_ctx[i].rice, 10, 10); | |
255 | } | |
256 | ||
257 | i = 0; | |
258 | for (p = s->decode_buffer; p < s->decode_buffer + (framelen * s->channels); p++) { | |
259 | int32_t *predictor = &s->ch_ctx[cur_chan].predictor; | |
260 | TTAFilter *filter = &s->ch_ctx[cur_chan].filter; | |
261 | TTARice *rice = &s->ch_ctx[cur_chan].rice; | |
262 | uint32_t unary, depth, k; | |
263 | int32_t value; | |
264 | ||
265 | unary = get_unary(&gb, 0, get_bits_left(&gb)); | |
266 | ||
267 | if (unary == 0) { | |
268 | depth = 0; | |
269 | k = rice->k0; | |
270 | } else { | |
271 | depth = 1; | |
272 | k = rice->k1; | |
273 | unary--; | |
274 | } | |
275 | ||
276 | if (get_bits_left(&gb) < k) { | |
277 | ret = AVERROR_INVALIDDATA; | |
278 | goto error; | |
279 | } | |
280 | ||
281 | if (k) { | |
282 | if (k > MIN_CACHE_BITS) { | |
283 | ret = AVERROR_INVALIDDATA; | |
284 | goto error; | |
285 | } | |
286 | value = (unary << k) + get_bits(&gb, k); | |
287 | } else | |
288 | value = unary; | |
289 | ||
290 | // FIXME: copy paste from original | |
291 | switch (depth) { | |
292 | case 1: | |
293 | rice->sum1 += value - (rice->sum1 >> 4); | |
294 | if (rice->k1 > 0 && rice->sum1 < ff_tta_shift_16[rice->k1]) | |
295 | rice->k1--; | |
296 | else if(rice->sum1 > ff_tta_shift_16[rice->k1 + 1]) | |
297 | rice->k1++; | |
298 | value += ff_tta_shift_1[rice->k0]; | |
299 | default: | |
300 | rice->sum0 += value - (rice->sum0 >> 4); | |
301 | if (rice->k0 > 0 && rice->sum0 < ff_tta_shift_16[rice->k0]) | |
302 | rice->k0--; | |
303 | else if(rice->sum0 > ff_tta_shift_16[rice->k0 + 1]) | |
304 | rice->k0++; | |
305 | } | |
306 | ||
307 | // extract coded value | |
308 | *p = 1 + ((value >> 1) ^ ((value & 1) - 1)); | |
309 | ||
310 | // run hybrid filter | |
311 | s->dsp.ttafilter_process_dec(filter->qm, filter->dx, filter->dl, &filter->error, p, | |
312 | filter->shift, filter->round); | |
313 | ||
314 | // fixed order prediction | |
315 | #define PRED(x, k) (int32_t)((((uint64_t)(x) << (k)) - (x)) >> (k)) | |
316 | switch (s->bps) { | |
317 | case 1: *p += PRED(*predictor, 4); break; | |
318 | case 2: | |
319 | case 3: *p += PRED(*predictor, 5); break; | |
320 | case 4: *p += *predictor; break; | |
321 | } | |
322 | *predictor = *p; | |
323 | ||
324 | // flip channels | |
325 | if (cur_chan < (s->channels-1)) | |
326 | cur_chan++; | |
327 | else { | |
328 | // decorrelate in case of multiple channels | |
329 | if (s->channels > 1) { | |
330 | int32_t *r = p - 1; | |
331 | for (*p += *r / 2; r > p - s->channels; r--) | |
332 | *r = *(r + 1) - *r; | |
333 | } | |
334 | cur_chan = 0; | |
335 | i++; | |
336 | // check for last frame | |
337 | if (i == s->last_frame_length && get_bits_left(&gb) / 8 == 4) { | |
338 | frame->nb_samples = framelen = s->last_frame_length; | |
339 | break; | |
340 | } | |
341 | } | |
342 | } | |
343 | ||
344 | align_get_bits(&gb); | |
345 | if (get_bits_left(&gb) < 32) { | |
346 | ret = AVERROR_INVALIDDATA; | |
347 | goto error; | |
348 | } | |
349 | skip_bits_long(&gb, 32); // frame crc | |
350 | ||
351 | // convert to output buffer | |
352 | switch (s->bps) { | |
353 | case 1: { | |
354 | uint8_t *samples = (uint8_t *)frame->data[0]; | |
355 | for (p = s->decode_buffer; p < s->decode_buffer + (framelen * s->channels); p++) | |
356 | *samples++ = *p + 0x80; | |
357 | break; | |
358 | } | |
359 | case 2: { | |
360 | int16_t *samples = (int16_t *)frame->data[0]; | |
361 | for (p = s->decode_buffer; p < s->decode_buffer + (framelen * s->channels); p++) | |
362 | *samples++ = *p; | |
363 | break; | |
364 | } | |
365 | case 3: { | |
366 | // shift samples for 24-bit sample format | |
367 | int32_t *samples = (int32_t *)frame->data[0]; | |
368 | for (i = 0; i < framelen * s->channels; i++) | |
369 | *samples++ <<= 8; | |
370 | // reset decode buffer | |
371 | s->decode_buffer = NULL; | |
372 | break; | |
373 | } | |
374 | } | |
375 | ||
376 | *got_frame_ptr = 1; | |
377 | ||
378 | return buf_size; | |
379 | error: | |
380 | // reset decode buffer | |
381 | if (s->bps == 3) | |
382 | s->decode_buffer = NULL; | |
383 | return ret; | |
384 | } | |
385 | ||
386 | static int init_thread_copy(AVCodecContext *avctx) | |
387 | { | |
388 | TTAContext *s = avctx->priv_data; | |
389 | s->avctx = avctx; | |
390 | return allocate_buffers(avctx); | |
391 | } | |
392 | ||
393 | static av_cold int tta_decode_close(AVCodecContext *avctx) { | |
394 | TTAContext *s = avctx->priv_data; | |
395 | ||
396 | if (s->bps < 3) | |
f6fa7814 | 397 | av_freep(&s->decode_buffer); |
2ba45a60 DM |
398 | s->decode_buffer = NULL; |
399 | av_freep(&s->ch_ctx); | |
400 | ||
401 | return 0; | |
402 | } | |
403 | ||
404 | #define OFFSET(x) offsetof(TTAContext, x) | |
405 | #define DEC (AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_AUDIO_PARAM) | |
406 | static const AVOption options[] = { | |
407 | { "password", "Set decoding password", OFFSET(pass), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, DEC }, | |
408 | { NULL }, | |
409 | }; | |
410 | ||
411 | static const AVClass tta_decoder_class = { | |
412 | .class_name = "TTA Decoder", | |
413 | .item_name = av_default_item_name, | |
414 | .option = options, | |
415 | .version = LIBAVUTIL_VERSION_INT, | |
416 | }; | |
417 | ||
418 | AVCodec ff_tta_decoder = { | |
419 | .name = "tta", | |
420 | .long_name = NULL_IF_CONFIG_SMALL("TTA (True Audio)"), | |
421 | .type = AVMEDIA_TYPE_AUDIO, | |
422 | .id = AV_CODEC_ID_TTA, | |
423 | .priv_data_size = sizeof(TTAContext), | |
424 | .init = tta_decode_init, | |
425 | .close = tta_decode_close, | |
426 | .decode = tta_decode_frame, | |
427 | .init_thread_copy = ONLY_IF_THREADS_ENABLED(init_thread_copy), | |
428 | .capabilities = CODEC_CAP_DR1 | CODEC_CAP_FRAME_THREADS, | |
429 | .priv_class = &tta_decoder_class, | |
430 | }; |