Details | Last modification | View Log | RSS feed
Rev | Author | Line No. | Line |
---|---|---|---|
4349 | Serge | 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 |
||
32 | #include "ttadata.h" |
||
33 | #include "avcodec.h" |
||
34 | #include "get_bits.h" |
||
35 | #include "thread.h" |
||
36 | #include "unary.h" |
||
37 | #include "internal.h" |
||
38 | #include "libavutil/crc.h" |
||
39 | #include "libavutil/intreadwrite.h" |
||
40 | #include "libavutil/opt.h" |
||
41 | |||
42 | #define FORMAT_SIMPLE 1 |
||
43 | #define FORMAT_ENCRYPTED 2 |
||
44 | |||
45 | typedef struct TTAContext { |
||
46 | AVClass *class; |
||
47 | AVCodecContext *avctx; |
||
48 | const AVCRC *crc_table; |
||
49 | |||
50 | int format, channels, bps; |
||
51 | unsigned data_length; |
||
52 | int frame_length, last_frame_length; |
||
53 | |||
54 | int32_t *decode_buffer; |
||
55 | |||
56 | uint8_t crc_pass[8]; |
||
57 | uint8_t *pass; |
||
58 | TTAChannel *ch_ctx; |
||
59 | } TTAContext; |
||
60 | |||
61 | static inline void ttafilter_process(TTAFilter *c, int32_t *in) |
||
62 | { |
||
63 | register int32_t *dl = c->dl, *qm = c->qm, *dx = c->dx, sum = c->round; |
||
64 | |||
65 | if (c->error < 0) { |
||
66 | qm[0] -= dx[0]; qm[1] -= dx[1]; qm[2] -= dx[2]; qm[3] -= dx[3]; |
||
67 | qm[4] -= dx[4]; qm[5] -= dx[5]; qm[6] -= dx[6]; qm[7] -= dx[7]; |
||
68 | } else if (c->error > 0) { |
||
69 | qm[0] += dx[0]; qm[1] += dx[1]; qm[2] += dx[2]; qm[3] += dx[3]; |
||
70 | qm[4] += dx[4]; qm[5] += dx[5]; qm[6] += dx[6]; qm[7] += dx[7]; |
||
71 | } |
||
72 | |||
73 | sum += dl[0] * qm[0] + dl[1] * qm[1] + dl[2] * qm[2] + dl[3] * qm[3] + |
||
74 | dl[4] * qm[4] + dl[5] * qm[5] + dl[6] * qm[6] + dl[7] * qm[7]; |
||
75 | |||
76 | dx[0] = dx[1]; dx[1] = dx[2]; dx[2] = dx[3]; dx[3] = dx[4]; |
||
77 | dl[0] = dl[1]; dl[1] = dl[2]; dl[2] = dl[3]; dl[3] = dl[4]; |
||
78 | |||
79 | dx[4] = ((dl[4] >> 30) | 1); |
||
80 | dx[5] = ((dl[5] >> 30) | 2) & ~1; |
||
81 | dx[6] = ((dl[6] >> 30) | 2) & ~1; |
||
82 | dx[7] = ((dl[7] >> 30) | 4) & ~3; |
||
83 | |||
84 | c->error = *in; |
||
85 | *in += (sum >> c->shift); |
||
86 | |||
87 | dl[4] = -dl[5]; dl[5] = -dl[6]; |
||
88 | dl[6] = *in - dl[7]; dl[7] = *in; |
||
89 | dl[5] += dl[6]; dl[4] += dl[5]; |
||
90 | } |
||
91 | |||
92 | static const int64_t tta_channel_layouts[7] = { |
||
93 | AV_CH_LAYOUT_STEREO, |
||
94 | AV_CH_LAYOUT_STEREO|AV_CH_LOW_FREQUENCY, |
||
95 | AV_CH_LAYOUT_QUAD, |
||
96 | 0, |
||
97 | AV_CH_LAYOUT_5POINT1_BACK, |
||
98 | AV_CH_LAYOUT_5POINT1_BACK|AV_CH_BACK_CENTER, |
||
99 | AV_CH_LAYOUT_7POINT1_WIDE |
||
100 | }; |
||
101 | |||
102 | static int tta_check_crc(TTAContext *s, const uint8_t *buf, int buf_size) |
||
103 | { |
||
104 | uint32_t crc, CRC; |
||
105 | |||
106 | CRC = AV_RL32(buf + buf_size); |
||
107 | crc = av_crc(s->crc_table, 0xFFFFFFFFU, buf, buf_size); |
||
108 | if (CRC != (crc ^ 0xFFFFFFFFU)) { |
||
109 | av_log(s->avctx, AV_LOG_ERROR, "CRC error\n"); |
||
110 | return AVERROR_INVALIDDATA; |
||
111 | } |
||
112 | |||
113 | return 0; |
||
114 | } |
||
115 | |||
116 | static uint64_t tta_check_crc64(uint8_t *pass) |
||
117 | { |
||
118 | uint64_t crc = UINT64_MAX, poly = 0x42F0E1EBA9EA3693U; |
||
119 | uint8_t *end = pass + strlen(pass); |
||
120 | int i; |
||
121 | |||
122 | while (pass < end) { |
||
123 | crc ^= (uint64_t)*pass++ << 56; |
||
124 | for (i = 0; i < 8; i++) |
||
125 | crc = (crc << 1) ^ (poly & (((int64_t) crc) >> 63)); |
||
126 | } |
||
127 | |||
128 | return crc ^ UINT64_MAX; |
||
129 | } |
||
130 | |||
131 | static int allocate_buffers(AVCodecContext *avctx) |
||
132 | { |
||
133 | TTAContext *s = avctx->priv_data; |
||
134 | |||
135 | if (s->bps < 3) { |
||
136 | s->decode_buffer = av_mallocz(sizeof(int32_t)*s->frame_length*s->channels); |
||
137 | if (!s->decode_buffer) |
||
138 | return AVERROR(ENOMEM); |
||
139 | } else |
||
140 | s->decode_buffer = NULL; |
||
141 | s->ch_ctx = av_malloc(avctx->channels * sizeof(*s->ch_ctx)); |
||
142 | if (!s->ch_ctx) { |
||
143 | av_freep(&s->decode_buffer); |
||
144 | return AVERROR(ENOMEM); |
||
145 | } |
||
146 | |||
147 | return 0; |
||
148 | } |
||
149 | |||
150 | static av_cold int tta_decode_init(AVCodecContext * avctx) |
||
151 | { |
||
152 | TTAContext *s = avctx->priv_data; |
||
153 | GetBitContext gb; |
||
154 | int total_frames; |
||
155 | |||
156 | s->avctx = avctx; |
||
157 | |||
158 | // 30bytes includes TTA1 header |
||
159 | if (avctx->extradata_size < 22) |
||
160 | return AVERROR_INVALIDDATA; |
||
161 | |||
162 | s->crc_table = av_crc_get_table(AV_CRC_32_IEEE_LE); |
||
163 | init_get_bits8(&gb, avctx->extradata, avctx->extradata_size); |
||
164 | if (show_bits_long(&gb, 32) == AV_RL32("TTA1")) { |
||
165 | /* signature */ |
||
166 | skip_bits_long(&gb, 32); |
||
167 | |||
168 | s->format = get_bits(&gb, 16); |
||
169 | if (s->format > 2) { |
||
170 | av_log(avctx, AV_LOG_ERROR, "Invalid format\n"); |
||
171 | return AVERROR_INVALIDDATA; |
||
172 | } |
||
173 | if (s->format == FORMAT_ENCRYPTED) { |
||
174 | if (!s->pass) { |
||
175 | av_log(avctx, AV_LOG_ERROR, "Missing password for encrypted stream. Please use the -password option\n"); |
||
176 | return AVERROR(EINVAL); |
||
177 | } |
||
178 | AV_WL64(s->crc_pass, tta_check_crc64(s->pass)); |
||
179 | } |
||
180 | avctx->channels = s->channels = get_bits(&gb, 16); |
||
181 | if (s->channels > 1 && s->channels < 9) |
||
182 | avctx->channel_layout = tta_channel_layouts[s->channels-2]; |
||
183 | avctx->bits_per_raw_sample = get_bits(&gb, 16); |
||
184 | s->bps = (avctx->bits_per_raw_sample + 7) / 8; |
||
185 | avctx->sample_rate = get_bits_long(&gb, 32); |
||
186 | s->data_length = get_bits_long(&gb, 32); |
||
187 | skip_bits_long(&gb, 32); // CRC32 of header |
||
188 | |||
189 | if (s->channels == 0) { |
||
190 | av_log(avctx, AV_LOG_ERROR, "Invalid number of channels\n"); |
||
191 | return AVERROR_INVALIDDATA; |
||
192 | } else if (avctx->sample_rate == 0) { |
||
193 | av_log(avctx, AV_LOG_ERROR, "Invalid samplerate\n"); |
||
194 | return AVERROR_INVALIDDATA; |
||
195 | } |
||
196 | |||
197 | switch(s->bps) { |
||
198 | case 1: avctx->sample_fmt = AV_SAMPLE_FMT_U8; break; |
||
199 | case 2: |
||
200 | avctx->sample_fmt = AV_SAMPLE_FMT_S16; |
||
201 | break; |
||
202 | case 3: |
||
203 | avctx->sample_fmt = AV_SAMPLE_FMT_S32; |
||
204 | break; |
||
205 | //case 4: avctx->sample_fmt = AV_SAMPLE_FMT_S32; break; |
||
206 | default: |
||
207 | av_log(avctx, AV_LOG_ERROR, "Invalid/unsupported sample format.\n"); |
||
208 | return AVERROR_INVALIDDATA; |
||
209 | } |
||
210 | |||
211 | // prevent overflow |
||
212 | if (avctx->sample_rate > 0x7FFFFFu) { |
||
213 | av_log(avctx, AV_LOG_ERROR, "sample_rate too large\n"); |
||
214 | return AVERROR(EINVAL); |
||
215 | } |
||
216 | s->frame_length = 256 * avctx->sample_rate / 245; |
||
217 | |||
218 | s->last_frame_length = s->data_length % s->frame_length; |
||
219 | total_frames = s->data_length / s->frame_length + |
||
220 | (s->last_frame_length ? 1 : 0); |
||
221 | |||
222 | av_log(avctx, AV_LOG_DEBUG, "format: %d chans: %d bps: %d rate: %d block: %d\n", |
||
223 | s->format, avctx->channels, avctx->bits_per_coded_sample, avctx->sample_rate, |
||
224 | avctx->block_align); |
||
225 | av_log(avctx, AV_LOG_DEBUG, "data_length: %d frame_length: %d last: %d total: %d\n", |
||
226 | s->data_length, s->frame_length, s->last_frame_length, total_frames); |
||
227 | |||
228 | if(s->frame_length >= UINT_MAX / (s->channels * sizeof(int32_t))){ |
||
229 | av_log(avctx, AV_LOG_ERROR, "frame_length too large\n"); |
||
230 | return AVERROR_INVALIDDATA; |
||
231 | } |
||
232 | } else { |
||
233 | av_log(avctx, AV_LOG_ERROR, "Wrong extradata present\n"); |
||
234 | return AVERROR_INVALIDDATA; |
||
235 | } |
||
236 | |||
237 | return allocate_buffers(avctx); |
||
238 | } |
||
239 | |||
240 | static int tta_decode_frame(AVCodecContext *avctx, void *data, |
||
241 | int *got_frame_ptr, AVPacket *avpkt) |
||
242 | { |
||
243 | AVFrame *frame = data; |
||
244 | ThreadFrame tframe = { .f = data }; |
||
245 | const uint8_t *buf = avpkt->data; |
||
246 | int buf_size = avpkt->size; |
||
247 | TTAContext *s = avctx->priv_data; |
||
248 | GetBitContext gb; |
||
249 | int i, ret; |
||
250 | int cur_chan = 0, framelen = s->frame_length; |
||
251 | int32_t *p; |
||
252 | |||
253 | if (avctx->err_recognition & AV_EF_CRCCHECK) { |
||
254 | if (buf_size < 4 || tta_check_crc(s, buf, buf_size - 4)) |
||
255 | return AVERROR_INVALIDDATA; |
||
256 | } |
||
257 | |||
258 | if ((ret = init_get_bits8(&gb, avpkt->data, avpkt->size)) < 0) |
||
259 | return ret; |
||
260 | |||
261 | /* get output buffer */ |
||
262 | frame->nb_samples = framelen; |
||
263 | if ((ret = ff_thread_get_buffer(avctx, &tframe, 0)) < 0) |
||
264 | return ret; |
||
265 | |||
266 | // decode directly to output buffer for 24-bit sample format |
||
267 | if (s->bps == 3) |
||
268 | s->decode_buffer = (int32_t *)frame->data[0]; |
||
269 | |||
270 | // init per channel states |
||
271 | for (i = 0; i < s->channels; i++) { |
||
272 | TTAFilter *filter = &s->ch_ctx[i].filter; |
||
273 | s->ch_ctx[i].predictor = 0; |
||
274 | ff_tta_filter_init(filter, ff_tta_filter_configs[s->bps-1]); |
||
275 | if (s->format == FORMAT_ENCRYPTED) { |
||
276 | int i; |
||
277 | for (i = 0; i < 8; i++) |
||
278 | filter->qm[i] = sign_extend(s->crc_pass[i], 8); |
||
279 | } |
||
280 | ff_tta_rice_init(&s->ch_ctx[i].rice, 10, 10); |
||
281 | } |
||
282 | |||
283 | i = 0; |
||
284 | for (p = s->decode_buffer; p < s->decode_buffer + (framelen * s->channels); p++) { |
||
285 | int32_t *predictor = &s->ch_ctx[cur_chan].predictor; |
||
286 | TTAFilter *filter = &s->ch_ctx[cur_chan].filter; |
||
287 | TTARice *rice = &s->ch_ctx[cur_chan].rice; |
||
288 | uint32_t unary, depth, k; |
||
289 | int32_t value; |
||
290 | |||
291 | unary = get_unary(&gb, 0, get_bits_left(&gb)); |
||
292 | |||
293 | if (unary == 0) { |
||
294 | depth = 0; |
||
295 | k = rice->k0; |
||
296 | } else { |
||
297 | depth = 1; |
||
298 | k = rice->k1; |
||
299 | unary--; |
||
300 | } |
||
301 | |||
302 | if (get_bits_left(&gb) < k) { |
||
303 | ret = AVERROR_INVALIDDATA; |
||
304 | goto error; |
||
305 | } |
||
306 | |||
307 | if (k) { |
||
308 | if (k > MIN_CACHE_BITS) { |
||
309 | ret = AVERROR_INVALIDDATA; |
||
310 | goto error; |
||
311 | } |
||
312 | value = (unary << k) + get_bits(&gb, k); |
||
313 | } else |
||
314 | value = unary; |
||
315 | |||
316 | // FIXME: copy paste from original |
||
317 | switch (depth) { |
||
318 | case 1: |
||
319 | rice->sum1 += value - (rice->sum1 >> 4); |
||
320 | if (rice->k1 > 0 && rice->sum1 < ff_tta_shift_16[rice->k1]) |
||
321 | rice->k1--; |
||
322 | else if(rice->sum1 > ff_tta_shift_16[rice->k1 + 1]) |
||
323 | rice->k1++; |
||
324 | value += ff_tta_shift_1[rice->k0]; |
||
325 | default: |
||
326 | rice->sum0 += value - (rice->sum0 >> 4); |
||
327 | if (rice->k0 > 0 && rice->sum0 < ff_tta_shift_16[rice->k0]) |
||
328 | rice->k0--; |
||
329 | else if(rice->sum0 > ff_tta_shift_16[rice->k0 + 1]) |
||
330 | rice->k0++; |
||
331 | } |
||
332 | |||
333 | // extract coded value |
||
334 | *p = 1 + ((value >> 1) ^ ((value & 1) - 1)); |
||
335 | |||
336 | // run hybrid filter |
||
337 | ttafilter_process(filter, p); |
||
338 | |||
339 | // fixed order prediction |
||
340 | #define PRED(x, k) (int32_t)((((uint64_t)x << k) - x) >> k) |
||
341 | switch (s->bps) { |
||
342 | case 1: *p += PRED(*predictor, 4); break; |
||
343 | case 2: |
||
344 | case 3: *p += PRED(*predictor, 5); break; |
||
345 | case 4: *p += *predictor; break; |
||
346 | } |
||
347 | *predictor = *p; |
||
348 | |||
349 | // flip channels |
||
350 | if (cur_chan < (s->channels-1)) |
||
351 | cur_chan++; |
||
352 | else { |
||
353 | // decorrelate in case of multiple channels |
||
354 | if (s->channels > 1) { |
||
355 | int32_t *r = p - 1; |
||
356 | for (*p += *r / 2; r > p - s->channels; r--) |
||
357 | *r = *(r + 1) - *r; |
||
358 | } |
||
359 | cur_chan = 0; |
||
360 | i++; |
||
361 | // check for last frame |
||
362 | if (i == s->last_frame_length && get_bits_left(&gb) / 8 == 4) { |
||
363 | frame->nb_samples = framelen = s->last_frame_length; |
||
364 | break; |
||
365 | } |
||
366 | } |
||
367 | } |
||
368 | |||
369 | align_get_bits(&gb); |
||
370 | if (get_bits_left(&gb) < 32) { |
||
371 | ret = AVERROR_INVALIDDATA; |
||
372 | goto error; |
||
373 | } |
||
374 | skip_bits_long(&gb, 32); // frame crc |
||
375 | |||
376 | // convert to output buffer |
||
377 | switch (s->bps) { |
||
378 | case 1: { |
||
379 | uint8_t *samples = (uint8_t *)frame->data[0]; |
||
380 | for (p = s->decode_buffer; p < s->decode_buffer + (framelen * s->channels); p++) |
||
381 | *samples++ = *p + 0x80; |
||
382 | break; |
||
383 | } |
||
384 | case 2: { |
||
385 | int16_t *samples = (int16_t *)frame->data[0]; |
||
386 | for (p = s->decode_buffer; p < s->decode_buffer + (framelen * s->channels); p++) |
||
387 | *samples++ = *p; |
||
388 | break; |
||
389 | } |
||
390 | case 3: { |
||
391 | // shift samples for 24-bit sample format |
||
392 | int32_t *samples = (int32_t *)frame->data[0]; |
||
393 | for (i = 0; i < framelen * s->channels; i++) |
||
394 | *samples++ <<= 8; |
||
395 | // reset decode buffer |
||
396 | s->decode_buffer = NULL; |
||
397 | break; |
||
398 | } |
||
399 | } |
||
400 | |||
401 | *got_frame_ptr = 1; |
||
402 | |||
403 | return buf_size; |
||
404 | error: |
||
405 | // reset decode buffer |
||
406 | if (s->bps == 3) |
||
407 | s->decode_buffer = NULL; |
||
408 | return ret; |
||
409 | } |
||
410 | |||
411 | static int init_thread_copy(AVCodecContext *avctx) |
||
412 | { |
||
413 | TTAContext *s = avctx->priv_data; |
||
414 | s->avctx = avctx; |
||
415 | return allocate_buffers(avctx); |
||
416 | } |
||
417 | |||
418 | static av_cold int tta_decode_close(AVCodecContext *avctx) { |
||
419 | TTAContext *s = avctx->priv_data; |
||
420 | |||
421 | if (s->bps < 3) |
||
422 | av_free(s->decode_buffer); |
||
423 | s->decode_buffer = NULL; |
||
424 | av_freep(&s->ch_ctx); |
||
425 | |||
426 | return 0; |
||
427 | } |
||
428 | |||
429 | #define OFFSET(x) offsetof(TTAContext, x) |
||
430 | #define DEC (AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_AUDIO_PARAM) |
||
431 | static const AVOption options[] = { |
||
432 | { "password", "Set decoding password", OFFSET(pass), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, DEC }, |
||
433 | { NULL }, |
||
434 | }; |
||
435 | |||
436 | static const AVClass tta_decoder_class = { |
||
437 | .class_name = "TTA Decoder", |
||
438 | .item_name = av_default_item_name, |
||
439 | .option = options, |
||
440 | .version = LIBAVUTIL_VERSION_INT, |
||
441 | }; |
||
442 | |||
443 | AVCodec ff_tta_decoder = { |
||
444 | .name = "tta", |
||
445 | .long_name = NULL_IF_CONFIG_SMALL("TTA (True Audio)"), |
||
446 | .type = AVMEDIA_TYPE_AUDIO, |
||
447 | .id = AV_CODEC_ID_TTA, |
||
448 | .priv_data_size = sizeof(TTAContext), |
||
449 | .init = tta_decode_init, |
||
450 | .close = tta_decode_close, |
||
451 | .decode = tta_decode_frame, |
||
452 | .init_thread_copy = ONLY_IF_THREADS_ENABLED(init_thread_copy), |
||
453 | .capabilities = CODEC_CAP_DR1 | CODEC_CAP_FRAME_THREADS, |
||
454 | .priv_class = &tta_decoder_class, |
||
455 | };>=><=>>>>>>><>>>><>>>>>>>>>>>><>>><>>> |