Imported Debian version 2.5.3~trusty1
[deb_ffmpeg.git] / ffmpeg / libavcodec / tta.c
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)
397 av_freep(&s->decode_buffer);
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 };