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bf4a1f17 KS |
1 | /* |
2 | * Monkey's Audio lossless audio decoder | |
3 | * Copyright (c) 2007 Benjamin Zores <ben@geexbox.org> | |
4 | * based upon libdemac from Dave Chapman. | |
5 | * | |
2912e87a | 6 | * This file is part of Libav. |
bf4a1f17 | 7 | * |
2912e87a | 8 | * Libav is free software; you can redistribute it and/or |
bf4a1f17 KS |
9 | * modify it under the terms of the GNU Lesser General Public |
10 | * License as published by the Free Software Foundation; either | |
11 | * version 2.1 of the License, or (at your option) any later version. | |
12 | * | |
2912e87a | 13 | * Libav is distributed in the hope that it will be useful, |
bf4a1f17 KS |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | * Lesser General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU Lesser General Public | |
2912e87a | 19 | * License along with Libav; if not, write to the Free Software |
bf4a1f17 KS |
20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
21 | */ | |
22 | ||
bf4a1f17 KS |
23 | #include "avcodec.h" |
24 | #include "dsputil.h" | |
bf4a1f17 | 25 | #include "bytestream.h" |
737eb597 | 26 | #include "libavutil/audioconvert.h" |
9a332644 | 27 | #include "libavutil/avassert.h" |
bf4a1f17 KS |
28 | |
29 | /** | |
ba87f080 | 30 | * @file |
bf4a1f17 KS |
31 | * Monkey's Audio lossless audio decoder |
32 | */ | |
33 | ||
34 | #define BLOCKS_PER_LOOP 4608 | |
35 | #define MAX_CHANNELS 2 | |
36 | #define MAX_BYTESPERSAMPLE 3 | |
37 | ||
38 | #define APE_FRAMECODE_MONO_SILENCE 1 | |
39 | #define APE_FRAMECODE_STEREO_SILENCE 3 | |
40 | #define APE_FRAMECODE_PSEUDO_STEREO 4 | |
41 | ||
42 | #define HISTORY_SIZE 512 | |
43 | #define PREDICTOR_ORDER 8 | |
44 | /** Total size of all predictor histories */ | |
45 | #define PREDICTOR_SIZE 50 | |
46 | ||
47 | #define YDELAYA (18 + PREDICTOR_ORDER*4) | |
48 | #define YDELAYB (18 + PREDICTOR_ORDER*3) | |
49 | #define XDELAYA (18 + PREDICTOR_ORDER*2) | |
50 | #define XDELAYB (18 + PREDICTOR_ORDER) | |
51 | ||
52 | #define YADAPTCOEFFSA 18 | |
53 | #define XADAPTCOEFFSA 14 | |
54 | #define YADAPTCOEFFSB 10 | |
55 | #define XADAPTCOEFFSB 5 | |
56 | ||
57 | /** | |
58 | * Possible compression levels | |
59 | * @{ | |
60 | */ | |
61 | enum APECompressionLevel { | |
62 | COMPRESSION_LEVEL_FAST = 1000, | |
63 | COMPRESSION_LEVEL_NORMAL = 2000, | |
64 | COMPRESSION_LEVEL_HIGH = 3000, | |
65 | COMPRESSION_LEVEL_EXTRA_HIGH = 4000, | |
66 | COMPRESSION_LEVEL_INSANE = 5000 | |
67 | }; | |
68 | /** @} */ | |
69 | ||
70 | #define APE_FILTER_LEVELS 3 | |
71 | ||
72 | /** Filter orders depending on compression level */ | |
73 | static const uint16_t ape_filter_orders[5][APE_FILTER_LEVELS] = { | |
74 | { 0, 0, 0 }, | |
75 | { 16, 0, 0 }, | |
76 | { 64, 0, 0 }, | |
77 | { 32, 256, 0 }, | |
78 | { 16, 256, 1280 } | |
79 | }; | |
80 | ||
81 | /** Filter fraction bits depending on compression level */ | |
1637930f | 82 | static const uint8_t ape_filter_fracbits[5][APE_FILTER_LEVELS] = { |
bf4a1f17 KS |
83 | { 0, 0, 0 }, |
84 | { 11, 0, 0 }, | |
85 | { 11, 0, 0 }, | |
86 | { 10, 13, 0 }, | |
87 | { 11, 13, 15 } | |
88 | }; | |
89 | ||
90 | ||
91 | /** Filters applied to the decoded data */ | |
92 | typedef struct APEFilter { | |
93 | int16_t *coeffs; ///< actual coefficients used in filtering | |
94 | int16_t *adaptcoeffs; ///< adaptive filter coefficients used for correcting of actual filter coefficients | |
95 | int16_t *historybuffer; ///< filter memory | |
96 | int16_t *delay; ///< filtered values | |
97 | ||
98 | int avg; | |
99 | } APEFilter; | |
100 | ||
101 | typedef struct APERice { | |
102 | uint32_t k; | |
103 | uint32_t ksum; | |
104 | } APERice; | |
105 | ||
106 | typedef struct APERangecoder { | |
107 | uint32_t low; ///< low end of interval | |
108 | uint32_t range; ///< length of interval | |
109 | uint32_t help; ///< bytes_to_follow resp. intermediate value | |
110 | unsigned int buffer; ///< buffer for input/output | |
111 | } APERangecoder; | |
112 | ||
113 | /** Filter histories */ | |
114 | typedef struct APEPredictor { | |
115 | int32_t *buf; | |
116 | ||
117 | int32_t lastA[2]; | |
118 | ||
119 | int32_t filterA[2]; | |
120 | int32_t filterB[2]; | |
121 | ||
122 | int32_t coeffsA[2][4]; ///< adaption coefficients | |
123 | int32_t coeffsB[2][5]; ///< adaption coefficients | |
124 | int32_t historybuffer[HISTORY_SIZE + PREDICTOR_SIZE]; | |
125 | } APEPredictor; | |
126 | ||
127 | /** Decoder context */ | |
128 | typedef struct APEContext { | |
129 | AVCodecContext *avctx; | |
0eea2129 | 130 | AVFrame frame; |
bf4a1f17 KS |
131 | DSPContext dsp; |
132 | int channels; | |
133 | int samples; ///< samples left to decode in current frame | |
b60620bf | 134 | int bps; |
bf4a1f17 KS |
135 | |
136 | int fileversion; ///< codec version, very important in decoding process | |
137 | int compression_level; ///< compression levels | |
138 | int fset; ///< which filter set to use (calculated from compression level) | |
139 | int flags; ///< global decoder flags | |
140 | ||
141 | uint32_t CRC; ///< frame CRC | |
142 | int frameflags; ///< frame flags | |
bf4a1f17 KS |
143 | APEPredictor predictor; ///< predictor used for final reconstruction |
144 | ||
145 | int32_t decoded0[BLOCKS_PER_LOOP]; ///< decoded data for the first channel | |
146 | int32_t decoded1[BLOCKS_PER_LOOP]; ///< decoded data for the second channel | |
147 | ||
148 | int16_t* filterbuf[APE_FILTER_LEVELS]; ///< filter memory | |
149 | ||
150 | APERangecoder rc; ///< rangecoder used to decode actual values | |
151 | APERice riceX; ///< rice code parameters for the second channel | |
152 | APERice riceY; ///< rice code parameters for the first channel | |
153 | APEFilter filters[APE_FILTER_LEVELS][2]; ///< filters used for reconstruction | |
154 | ||
155 | uint8_t *data; ///< current frame data | |
156 | uint8_t *data_end; ///< frame data end | |
e4169612 | 157 | int data_size; ///< frame data allocated size |
f84a02c0 | 158 | const uint8_t *ptr; ///< current position in frame data |
6a287b73 MN |
159 | |
160 | int error; | |
bf4a1f17 KS |
161 | } APEContext; |
162 | ||
163 | // TODO: dsputilize | |
bf4a1f17 | 164 | |
da55e098 | 165 | static av_cold int ape_decode_close(AVCodecContext *avctx) |
75007813 JR |
166 | { |
167 | APEContext *s = avctx->priv_data; | |
168 | int i; | |
169 | ||
170 | for (i = 0; i < APE_FILTER_LEVELS; i++) | |
171 | av_freep(&s->filterbuf[i]); | |
172 | ||
173 | av_freep(&s->data); | |
e4169612 JR |
174 | s->data_size = 0; |
175 | ||
75007813 JR |
176 | return 0; |
177 | } | |
178 | ||
da55e098 | 179 | static av_cold int ape_decode_init(AVCodecContext *avctx) |
bf4a1f17 KS |
180 | { |
181 | APEContext *s = avctx->priv_data; | |
182 | int i; | |
183 | ||
184 | if (avctx->extradata_size != 6) { | |
185 | av_log(avctx, AV_LOG_ERROR, "Incorrect extradata\n"); | |
f64e0a2f | 186 | return AVERROR(EINVAL); |
bf4a1f17 | 187 | } |
bf4a1f17 KS |
188 | if (avctx->channels > 2) { |
189 | av_log(avctx, AV_LOG_ERROR, "Only mono and stereo is supported\n"); | |
f64e0a2f | 190 | return AVERROR(EINVAL); |
bf4a1f17 | 191 | } |
b60620bf PM |
192 | s->bps = avctx->bits_per_coded_sample; |
193 | switch (s->bps) { | |
194 | case 8: | |
195 | avctx->sample_fmt = AV_SAMPLE_FMT_U8; | |
196 | break; | |
197 | case 16: | |
198 | avctx->sample_fmt = AV_SAMPLE_FMT_S16; | |
199 | break; | |
200 | case 24: | |
201 | avctx->sample_fmt = AV_SAMPLE_FMT_S32; | |
202 | break; | |
203 | default: | |
204 | av_log_ask_for_sample(avctx, "Unsupported bits per coded sample %d\n", | |
205 | s->bps); | |
206 | return AVERROR_PATCHWELCOME; | |
207 | } | |
bf4a1f17 KS |
208 | s->avctx = avctx; |
209 | s->channels = avctx->channels; | |
210 | s->fileversion = AV_RL16(avctx->extradata); | |
211 | s->compression_level = AV_RL16(avctx->extradata + 2); | |
212 | s->flags = AV_RL16(avctx->extradata + 4); | |
213 | ||
da55e098 JR |
214 | av_log(avctx, AV_LOG_DEBUG, "Compression Level: %d - Flags: %d\n", |
215 | s->compression_level, s->flags); | |
bf4a1f17 | 216 | if (s->compression_level % 1000 || s->compression_level > COMPRESSION_LEVEL_INSANE) { |
da55e098 JR |
217 | av_log(avctx, AV_LOG_ERROR, "Incorrect compression level %d\n", |
218 | s->compression_level); | |
f64e0a2f | 219 | return AVERROR_INVALIDDATA; |
bf4a1f17 KS |
220 | } |
221 | s->fset = s->compression_level / 1000 - 1; | |
222 | for (i = 0; i < APE_FILTER_LEVELS; i++) { | |
223 | if (!ape_filter_orders[s->fset][i]) | |
224 | break; | |
75007813 JR |
225 | FF_ALLOC_OR_GOTO(avctx, s->filterbuf[i], |
226 | (ape_filter_orders[s->fset][i] * 3 + HISTORY_SIZE) * 4, | |
227 | filter_alloc_fail); | |
bf4a1f17 KS |
228 | } |
229 | ||
230 | dsputil_init(&s->dsp, avctx); | |
c2fcd0a7 | 231 | avctx->channel_layout = (avctx->channels==2) ? AV_CH_LAYOUT_STEREO : AV_CH_LAYOUT_MONO; |
0eea2129 JR |
232 | |
233 | avcodec_get_frame_defaults(&s->frame); | |
234 | avctx->coded_frame = &s->frame; | |
235 | ||
bf4a1f17 | 236 | return 0; |
75007813 JR |
237 | filter_alloc_fail: |
238 | ape_decode_close(avctx); | |
239 | return AVERROR(ENOMEM); | |
bf4a1f17 KS |
240 | } |
241 | ||
242 | /** | |
21a19b79 | 243 | * @name APE range decoding functions |
bf4a1f17 KS |
244 | * @{ |
245 | */ | |
246 | ||
247 | #define CODE_BITS 32 | |
248 | #define TOP_VALUE ((unsigned int)1 << (CODE_BITS-1)) | |
249 | #define SHIFT_BITS (CODE_BITS - 9) | |
250 | #define EXTRA_BITS ((CODE_BITS-2) % 8 + 1) | |
251 | #define BOTTOM_VALUE (TOP_VALUE >> 8) | |
252 | ||
253 | /** Start the decoder */ | |
da55e098 | 254 | static inline void range_start_decoding(APEContext *ctx) |
bf4a1f17 KS |
255 | { |
256 | ctx->rc.buffer = bytestream_get_byte(&ctx->ptr); | |
257 | ctx->rc.low = ctx->rc.buffer >> (8 - EXTRA_BITS); | |
258 | ctx->rc.range = (uint32_t) 1 << EXTRA_BITS; | |
259 | } | |
260 | ||
261 | /** Perform normalization */ | |
da55e098 | 262 | static inline void range_dec_normalize(APEContext *ctx) |
bf4a1f17 KS |
263 | { |
264 | while (ctx->rc.range <= BOTTOM_VALUE) { | |
1a2a1d90 | 265 | ctx->rc.buffer <<= 8; |
5b8009f4 | 266 | if(ctx->ptr < ctx->data_end) { |
1a2a1d90 | 267 | ctx->rc.buffer += *ctx->ptr; |
5b8009f4 JR |
268 | ctx->ptr++; |
269 | } else { | |
270 | ctx->error = 1; | |
271 | } | |
bf4a1f17 KS |
272 | ctx->rc.low = (ctx->rc.low << 8) | ((ctx->rc.buffer >> 1) & 0xFF); |
273 | ctx->rc.range <<= 8; | |
274 | } | |
275 | } | |
276 | ||
277 | /** | |
278 | * Calculate culmulative frequency for next symbol. Does NO update! | |
20642e28 | 279 | * @param ctx decoder context |
bf4a1f17 KS |
280 | * @param tot_f is the total frequency or (code_value)1<<shift |
281 | * @return the culmulative frequency | |
282 | */ | |
da55e098 | 283 | static inline int range_decode_culfreq(APEContext *ctx, int tot_f) |
bf4a1f17 KS |
284 | { |
285 | range_dec_normalize(ctx); | |
286 | ctx->rc.help = ctx->rc.range / tot_f; | |
287 | return ctx->rc.low / ctx->rc.help; | |
288 | } | |
289 | ||
290 | /** | |
291 | * Decode value with given size in bits | |
20642e28 | 292 | * @param ctx decoder context |
bf4a1f17 KS |
293 | * @param shift number of bits to decode |
294 | */ | |
da55e098 | 295 | static inline int range_decode_culshift(APEContext *ctx, int shift) |
bf4a1f17 KS |
296 | { |
297 | range_dec_normalize(ctx); | |
298 | ctx->rc.help = ctx->rc.range >> shift; | |
299 | return ctx->rc.low / ctx->rc.help; | |
300 | } | |
301 | ||
302 | ||
303 | /** | |
304 | * Update decoding state | |
20642e28 | 305 | * @param ctx decoder context |
bf4a1f17 KS |
306 | * @param sy_f the interval length (frequency of the symbol) |
307 | * @param lt_f the lower end (frequency sum of < symbols) | |
308 | */ | |
da55e098 | 309 | static inline void range_decode_update(APEContext *ctx, int sy_f, int lt_f) |
bf4a1f17 KS |
310 | { |
311 | ctx->rc.low -= ctx->rc.help * lt_f; | |
312 | ctx->rc.range = ctx->rc.help * sy_f; | |
313 | } | |
314 | ||
315 | /** Decode n bits (n <= 16) without modelling */ | |
da55e098 | 316 | static inline int range_decode_bits(APEContext *ctx, int n) |
bf4a1f17 KS |
317 | { |
318 | int sym = range_decode_culshift(ctx, n); | |
319 | range_decode_update(ctx, 1, sym); | |
320 | return sym; | |
321 | } | |
322 | ||
323 | ||
324 | #define MODEL_ELEMENTS 64 | |
325 | ||
326 | /** | |
327 | * Fixed probabilities for symbols in Monkey Audio version 3.97 | |
328 | */ | |
1637930f | 329 | static const uint16_t counts_3970[22] = { |
bf4a1f17 KS |
330 | 0, 14824, 28224, 39348, 47855, 53994, 58171, 60926, |
331 | 62682, 63786, 64463, 64878, 65126, 65276, 65365, 65419, | |
8d4bef64 | 332 | 65450, 65469, 65480, 65487, 65491, 65493, |
bf4a1f17 KS |
333 | }; |
334 | ||
335 | /** | |
336 | * Probability ranges for symbols in Monkey Audio version 3.97 | |
337 | */ | |
8d4bef64 | 338 | static const uint16_t counts_diff_3970[21] = { |
bf4a1f17 KS |
339 | 14824, 13400, 11124, 8507, 6139, 4177, 2755, 1756, |
340 | 1104, 677, 415, 248, 150, 89, 54, 31, | |
8d4bef64 | 341 | 19, 11, 7, 4, 2, |
bf4a1f17 KS |
342 | }; |
343 | ||
344 | /** | |
345 | * Fixed probabilities for symbols in Monkey Audio version 3.98 | |
346 | */ | |
1637930f | 347 | static const uint16_t counts_3980[22] = { |
bf4a1f17 KS |
348 | 0, 19578, 36160, 48417, 56323, 60899, 63265, 64435, |
349 | 64971, 65232, 65351, 65416, 65447, 65466, 65476, 65482, | |
8d4bef64 | 350 | 65485, 65488, 65490, 65491, 65492, 65493, |
bf4a1f17 KS |
351 | }; |
352 | ||
353 | /** | |
354 | * Probability ranges for symbols in Monkey Audio version 3.98 | |
355 | */ | |
8d4bef64 | 356 | static const uint16_t counts_diff_3980[21] = { |
bf4a1f17 KS |
357 | 19578, 16582, 12257, 7906, 4576, 2366, 1170, 536, |
358 | 261, 119, 65, 31, 19, 10, 6, 3, | |
8d4bef64 | 359 | 3, 2, 1, 1, 1, |
bf4a1f17 KS |
360 | }; |
361 | ||
362 | /** | |
363 | * Decode symbol | |
20642e28 | 364 | * @param ctx decoder context |
bf4a1f17 | 365 | * @param counts probability range start position |
20642e28 | 366 | * @param counts_diff probability range widths |
bf4a1f17 | 367 | */ |
da55e098 | 368 | static inline int range_get_symbol(APEContext *ctx, |
1637930f | 369 | const uint16_t counts[], |
bf4a1f17 KS |
370 | const uint16_t counts_diff[]) |
371 | { | |
372 | int symbol, cf; | |
373 | ||
374 | cf = range_decode_culshift(ctx, 16); | |
375 | ||
6a287b73 MN |
376 | if(cf > 65492){ |
377 | symbol= cf - 65535 + 63; | |
378 | range_decode_update(ctx, 1, cf); | |
379 | if(cf > 65535) | |
380 | ctx->error=1; | |
381 | return symbol; | |
382 | } | |
bf4a1f17 KS |
383 | /* figure out the symbol inefficiently; a binary search would be much better */ |
384 | for (symbol = 0; counts[symbol + 1] <= cf; symbol++); | |
385 | ||
386 | range_decode_update(ctx, counts_diff[symbol], counts[symbol]); | |
387 | ||
388 | return symbol; | |
389 | } | |
390 | /** @} */ // group rangecoder | |
391 | ||
392 | static inline void update_rice(APERice *rice, int x) | |
393 | { | |
e774c41c | 394 | int lim = rice->k ? (1 << (rice->k + 4)) : 0; |
bf4a1f17 KS |
395 | rice->ksum += ((x + 1) / 2) - ((rice->ksum + 16) >> 5); |
396 | ||
e774c41c | 397 | if (rice->ksum < lim) |
bf4a1f17 KS |
398 | rice->k--; |
399 | else if (rice->ksum >= (1 << (rice->k + 5))) | |
400 | rice->k++; | |
401 | } | |
402 | ||
da55e098 | 403 | static inline int ape_decode_value(APEContext *ctx, APERice *rice) |
bf4a1f17 KS |
404 | { |
405 | int x, overflow; | |
406 | ||
eca0bcb6 | 407 | if (ctx->fileversion < 3990) { |
bf4a1f17 KS |
408 | int tmpk; |
409 | ||
410 | overflow = range_get_symbol(ctx, counts_3970, counts_diff_3970); | |
411 | ||
412 | if (overflow == (MODEL_ELEMENTS - 1)) { | |
413 | tmpk = range_decode_bits(ctx, 5); | |
414 | overflow = 0; | |
415 | } else | |
416 | tmpk = (rice->k < 1) ? 0 : rice->k - 1; | |
417 | ||
418 | if (tmpk <= 16) | |
419 | x = range_decode_bits(ctx, tmpk); | |
420 | else { | |
421 | x = range_decode_bits(ctx, 16); | |
422 | x |= (range_decode_bits(ctx, tmpk - 16) << 16); | |
423 | } | |
424 | x += overflow << tmpk; | |
425 | } else { | |
426 | int base, pivot; | |
427 | ||
428 | pivot = rice->ksum >> 5; | |
429 | if (pivot == 0) | |
430 | pivot = 1; | |
431 | ||
432 | overflow = range_get_symbol(ctx, counts_3980, counts_diff_3980); | |
433 | ||
434 | if (overflow == (MODEL_ELEMENTS - 1)) { | |
435 | overflow = range_decode_bits(ctx, 16) << 16; | |
436 | overflow |= range_decode_bits(ctx, 16); | |
437 | } | |
438 | ||
76267e4e KS |
439 | if (pivot < 0x10000) { |
440 | base = range_decode_culfreq(ctx, pivot); | |
441 | range_decode_update(ctx, 1, base); | |
442 | } else { | |
443 | int base_hi = pivot, base_lo; | |
444 | int bbits = 0; | |
445 | ||
446 | while (base_hi & ~0xFFFF) { | |
447 | base_hi >>= 1; | |
448 | bbits++; | |
449 | } | |
450 | base_hi = range_decode_culfreq(ctx, base_hi + 1); | |
451 | range_decode_update(ctx, 1, base_hi); | |
452 | base_lo = range_decode_culfreq(ctx, 1 << bbits); | |
453 | range_decode_update(ctx, 1, base_lo); | |
454 | ||
455 | base = (base_hi << bbits) + base_lo; | |
456 | } | |
bf4a1f17 KS |
457 | |
458 | x = base + overflow * pivot; | |
459 | } | |
460 | ||
461 | update_rice(rice, x); | |
462 | ||
463 | /* Convert to signed */ | |
464 | if (x & 1) | |
465 | return (x >> 1) + 1; | |
466 | else | |
467 | return -(x >> 1); | |
468 | } | |
469 | ||
da55e098 | 470 | static void entropy_decode(APEContext *ctx, int blockstodecode, int stereo) |
bf4a1f17 KS |
471 | { |
472 | int32_t *decoded0 = ctx->decoded0; | |
473 | int32_t *decoded1 = ctx->decoded1; | |
474 | ||
bf4a1f17 KS |
475 | if (ctx->frameflags & APE_FRAMECODE_STEREO_SILENCE) { |
476 | /* We are pure silence, just memset the output buffer. */ | |
477 | memset(decoded0, 0, blockstodecode * sizeof(int32_t)); | |
478 | memset(decoded1, 0, blockstodecode * sizeof(int32_t)); | |
479 | } else { | |
480 | while (blockstodecode--) { | |
481 | *decoded0++ = ape_decode_value(ctx, &ctx->riceY); | |
482 | if (stereo) | |
483 | *decoded1++ = ape_decode_value(ctx, &ctx->riceX); | |
484 | } | |
485 | } | |
bf4a1f17 KS |
486 | } |
487 | ||
a4c32c9a | 488 | static int init_entropy_decoder(APEContext *ctx) |
bf4a1f17 KS |
489 | { |
490 | /* Read the CRC */ | |
a4c32c9a JR |
491 | if (ctx->data_end - ctx->ptr < 6) |
492 | return AVERROR_INVALIDDATA; | |
bf4a1f17 KS |
493 | ctx->CRC = bytestream_get_be32(&ctx->ptr); |
494 | ||
495 | /* Read the frame flags if they exist */ | |
496 | ctx->frameflags = 0; | |
497 | if ((ctx->fileversion > 3820) && (ctx->CRC & 0x80000000)) { | |
498 | ctx->CRC &= ~0x80000000; | |
499 | ||
a4c32c9a JR |
500 | if (ctx->data_end - ctx->ptr < 6) |
501 | return AVERROR_INVALIDDATA; | |
bf4a1f17 KS |
502 | ctx->frameflags = bytestream_get_be32(&ctx->ptr); |
503 | } | |
504 | ||
52b541ad | 505 | /* Initialize the rice structs */ |
bf4a1f17 KS |
506 | ctx->riceX.k = 10; |
507 | ctx->riceX.ksum = (1 << ctx->riceX.k) * 16; | |
508 | ctx->riceY.k = 10; | |
509 | ctx->riceY.ksum = (1 << ctx->riceY.k) * 16; | |
510 | ||
511 | /* The first 8 bits of input are ignored. */ | |
512 | ctx->ptr++; | |
513 | ||
514 | range_start_decoding(ctx); | |
a4c32c9a JR |
515 | |
516 | return 0; | |
bf4a1f17 KS |
517 | } |
518 | ||
519 | static const int32_t initial_coeffs[4] = { | |
520 | 360, 317, -109, 98 | |
521 | }; | |
522 | ||
da55e098 | 523 | static void init_predictor_decoder(APEContext *ctx) |
bf4a1f17 KS |
524 | { |
525 | APEPredictor *p = &ctx->predictor; | |
526 | ||
527 | /* Zero the history buffers */ | |
528 | memset(p->historybuffer, 0, PREDICTOR_SIZE * sizeof(int32_t)); | |
529 | p->buf = p->historybuffer; | |
530 | ||
d0b53d05 | 531 | /* Initialize and zero the coefficients */ |
bf4a1f17 KS |
532 | memcpy(p->coeffsA[0], initial_coeffs, sizeof(initial_coeffs)); |
533 | memcpy(p->coeffsA[1], initial_coeffs, sizeof(initial_coeffs)); | |
534 | memset(p->coeffsB, 0, sizeof(p->coeffsB)); | |
535 | ||
536 | p->filterA[0] = p->filterA[1] = 0; | |
537 | p->filterB[0] = p->filterB[1] = 0; | |
538 | p->lastA[0] = p->lastA[1] = 0; | |
539 | } | |
540 | ||
541 | /** Get inverse sign of integer (-1 for positive, 1 for negative and 0 for zero) */ | |
542 | static inline int APESIGN(int32_t x) { | |
543 | return (x < 0) - (x > 0); | |
544 | } | |
545 | ||
da55e098 JR |
546 | static av_always_inline int predictor_update_filter(APEPredictor *p, |
547 | const int decoded, const int filter, | |
548 | const int delayA, const int delayB, | |
549 | const int adaptA, const int adaptB) | |
bf4a1f17 | 550 | { |
2ae87a6d | 551 | int32_t predictionA, predictionB, sign; |
bf4a1f17 KS |
552 | |
553 | p->buf[delayA] = p->lastA[filter]; | |
554 | p->buf[adaptA] = APESIGN(p->buf[delayA]); | |
555 | p->buf[delayA - 1] = p->buf[delayA] - p->buf[delayA - 1]; | |
556 | p->buf[adaptA - 1] = APESIGN(p->buf[delayA - 1]); | |
557 | ||
558 | predictionA = p->buf[delayA ] * p->coeffsA[filter][0] + | |
559 | p->buf[delayA - 1] * p->coeffsA[filter][1] + | |
560 | p->buf[delayA - 2] * p->coeffsA[filter][2] + | |
561 | p->buf[delayA - 3] * p->coeffsA[filter][3]; | |
562 | ||
563 | /* Apply a scaled first-order filter compression */ | |
564 | p->buf[delayB] = p->filterA[filter ^ 1] - ((p->filterB[filter] * 31) >> 5); | |
565 | p->buf[adaptB] = APESIGN(p->buf[delayB]); | |
566 | p->buf[delayB - 1] = p->buf[delayB] - p->buf[delayB - 1]; | |
567 | p->buf[adaptB - 1] = APESIGN(p->buf[delayB - 1]); | |
568 | p->filterB[filter] = p->filterA[filter ^ 1]; | |
569 | ||
570 | predictionB = p->buf[delayB ] * p->coeffsB[filter][0] + | |
571 | p->buf[delayB - 1] * p->coeffsB[filter][1] + | |
572 | p->buf[delayB - 2] * p->coeffsB[filter][2] + | |
573 | p->buf[delayB - 3] * p->coeffsB[filter][3] + | |
574 | p->buf[delayB - 4] * p->coeffsB[filter][4]; | |
575 | ||
576 | p->lastA[filter] = decoded + ((predictionA + (predictionB >> 1)) >> 10); | |
577 | p->filterA[filter] = p->lastA[filter] + ((p->filterA[filter] * 31) >> 5); | |
578 | ||
2ae87a6d LM |
579 | sign = APESIGN(decoded); |
580 | p->coeffsA[filter][0] += p->buf[adaptA ] * sign; | |
581 | p->coeffsA[filter][1] += p->buf[adaptA - 1] * sign; | |
582 | p->coeffsA[filter][2] += p->buf[adaptA - 2] * sign; | |
583 | p->coeffsA[filter][3] += p->buf[adaptA - 3] * sign; | |
584 | p->coeffsB[filter][0] += p->buf[adaptB ] * sign; | |
585 | p->coeffsB[filter][1] += p->buf[adaptB - 1] * sign; | |
586 | p->coeffsB[filter][2] += p->buf[adaptB - 2] * sign; | |
587 | p->coeffsB[filter][3] += p->buf[adaptB - 3] * sign; | |
588 | p->coeffsB[filter][4] += p->buf[adaptB - 4] * sign; | |
bf4a1f17 | 589 | |
bf4a1f17 KS |
590 | return p->filterA[filter]; |
591 | } | |
592 | ||
da55e098 | 593 | static void predictor_decode_stereo(APEContext *ctx, int count) |
bf4a1f17 | 594 | { |
bf4a1f17 KS |
595 | APEPredictor *p = &ctx->predictor; |
596 | int32_t *decoded0 = ctx->decoded0; | |
597 | int32_t *decoded1 = ctx->decoded1; | |
598 | ||
599 | while (count--) { | |
600 | /* Predictor Y */ | |
da55e098 JR |
601 | *decoded0 = predictor_update_filter(p, *decoded0, 0, YDELAYA, YDELAYB, |
602 | YADAPTCOEFFSA, YADAPTCOEFFSB); | |
36373cde | 603 | decoded0++; |
da55e098 JR |
604 | *decoded1 = predictor_update_filter(p, *decoded1, 1, XDELAYA, XDELAYB, |
605 | XADAPTCOEFFSA, XADAPTCOEFFSB); | |
36373cde | 606 | decoded1++; |
bf4a1f17 KS |
607 | |
608 | /* Combined */ | |
609 | p->buf++; | |
610 | ||
611 | /* Have we filled the history buffer? */ | |
612 | if (p->buf == p->historybuffer + HISTORY_SIZE) { | |
613 | memmove(p->historybuffer, p->buf, PREDICTOR_SIZE * sizeof(int32_t)); | |
614 | p->buf = p->historybuffer; | |
615 | } | |
616 | } | |
617 | } | |
618 | ||
da55e098 | 619 | static void predictor_decode_mono(APEContext *ctx, int count) |
bf4a1f17 KS |
620 | { |
621 | APEPredictor *p = &ctx->predictor; | |
622 | int32_t *decoded0 = ctx->decoded0; | |
2ae87a6d | 623 | int32_t predictionA, currentA, A, sign; |
bf4a1f17 KS |
624 | |
625 | currentA = p->lastA[0]; | |
626 | ||
627 | while (count--) { | |
628 | A = *decoded0; | |
629 | ||
630 | p->buf[YDELAYA] = currentA; | |
631 | p->buf[YDELAYA - 1] = p->buf[YDELAYA] - p->buf[YDELAYA - 1]; | |
632 | ||
633 | predictionA = p->buf[YDELAYA ] * p->coeffsA[0][0] + | |
634 | p->buf[YDELAYA - 1] * p->coeffsA[0][1] + | |
635 | p->buf[YDELAYA - 2] * p->coeffsA[0][2] + | |
636 | p->buf[YDELAYA - 3] * p->coeffsA[0][3]; | |
637 | ||
638 | currentA = A + (predictionA >> 10); | |
639 | ||
640 | p->buf[YADAPTCOEFFSA] = APESIGN(p->buf[YDELAYA ]); | |
641 | p->buf[YADAPTCOEFFSA - 1] = APESIGN(p->buf[YDELAYA - 1]); | |
642 | ||
2ae87a6d LM |
643 | sign = APESIGN(A); |
644 | p->coeffsA[0][0] += p->buf[YADAPTCOEFFSA ] * sign; | |
645 | p->coeffsA[0][1] += p->buf[YADAPTCOEFFSA - 1] * sign; | |
646 | p->coeffsA[0][2] += p->buf[YADAPTCOEFFSA - 2] * sign; | |
647 | p->coeffsA[0][3] += p->buf[YADAPTCOEFFSA - 3] * sign; | |
bf4a1f17 KS |
648 | |
649 | p->buf++; | |
650 | ||
651 | /* Have we filled the history buffer? */ | |
652 | if (p->buf == p->historybuffer + HISTORY_SIZE) { | |
653 | memmove(p->historybuffer, p->buf, PREDICTOR_SIZE * sizeof(int32_t)); | |
654 | p->buf = p->historybuffer; | |
655 | } | |
656 | ||
657 | p->filterA[0] = currentA + ((p->filterA[0] * 31) >> 5); | |
658 | *(decoded0++) = p->filterA[0]; | |
659 | } | |
660 | ||
661 | p->lastA[0] = currentA; | |
662 | } | |
663 | ||
da55e098 | 664 | static void do_init_filter(APEFilter *f, int16_t *buf, int order) |
bf4a1f17 KS |
665 | { |
666 | f->coeffs = buf; | |
667 | f->historybuffer = buf + order; | |
668 | f->delay = f->historybuffer + order * 2; | |
669 | f->adaptcoeffs = f->historybuffer + order; | |
670 | ||
671 | memset(f->historybuffer, 0, (order * 2) * sizeof(int16_t)); | |
672 | memset(f->coeffs, 0, order * sizeof(int16_t)); | |
673 | f->avg = 0; | |
674 | } | |
675 | ||
da55e098 | 676 | static void init_filter(APEContext *ctx, APEFilter *f, int16_t *buf, int order) |
bf4a1f17 KS |
677 | { |
678 | do_init_filter(&f[0], buf, order); | |
679 | do_init_filter(&f[1], buf + order * 3 + HISTORY_SIZE, order); | |
680 | } | |
681 | ||
da55e098 JR |
682 | static void do_apply_filter(APEContext *ctx, int version, APEFilter *f, |
683 | int32_t *data, int count, int order, int fracbits) | |
bf4a1f17 KS |
684 | { |
685 | int res; | |
686 | int absres; | |
687 | ||
688 | while (count--) { | |
689 | /* round fixedpoint scalar product */ | |
da55e098 JR |
690 | res = ctx->dsp.scalarproduct_and_madd_int16(f->coeffs, f->delay - order, |
691 | f->adaptcoeffs - order, | |
692 | order, APESIGN(*data)); | |
b1159ad9 | 693 | res = (res + (1 << (fracbits - 1))) >> fracbits; |
bf4a1f17 | 694 | res += *data; |
bf4a1f17 KS |
695 | *data++ = res; |
696 | ||
697 | /* Update the output history */ | |
698 | *f->delay++ = av_clip_int16(res); | |
699 | ||
700 | if (version < 3980) { | |
701 | /* Version ??? to < 3.98 files (untested) */ | |
702 | f->adaptcoeffs[0] = (res == 0) ? 0 : ((res >> 28) & 8) - 4; | |
703 | f->adaptcoeffs[-4] >>= 1; | |
704 | f->adaptcoeffs[-8] >>= 1; | |
705 | } else { | |
706 | /* Version 3.98 and later files */ | |
707 | ||
708 | /* Update the adaption coefficients */ | |
d09f65c7 LM |
709 | absres = FFABS(res); |
710 | if (absres) | |
644bff6c | 711 | *f->adaptcoeffs = ((res & (-1<<31)) ^ (-1<<30)) >> |
da55e098 | 712 | (25 + (absres <= f->avg*3) + (absres <= f->avg*4/3)); |
bf4a1f17 KS |
713 | else |
714 | *f->adaptcoeffs = 0; | |
715 | ||
716 | f->avg += (absres - f->avg) / 16; | |
717 | ||
718 | f->adaptcoeffs[-1] >>= 1; | |
719 | f->adaptcoeffs[-2] >>= 1; | |
720 | f->adaptcoeffs[-8] >>= 1; | |
721 | } | |
722 | ||
723 | f->adaptcoeffs++; | |
724 | ||
725 | /* Have we filled the history buffer? */ | |
726 | if (f->delay == f->historybuffer + HISTORY_SIZE + (order * 2)) { | |
727 | memmove(f->historybuffer, f->delay - (order * 2), | |
728 | (order * 2) * sizeof(int16_t)); | |
729 | f->delay = f->historybuffer + order * 2; | |
730 | f->adaptcoeffs = f->historybuffer + order; | |
731 | } | |
732 | } | |
733 | } | |
734 | ||
da55e098 JR |
735 | static void apply_filter(APEContext *ctx, APEFilter *f, |
736 | int32_t *data0, int32_t *data1, | |
bf4a1f17 KS |
737 | int count, int order, int fracbits) |
738 | { | |
88c0536a | 739 | do_apply_filter(ctx, ctx->fileversion, &f[0], data0, count, order, fracbits); |
bf4a1f17 | 740 | if (data1) |
88c0536a | 741 | do_apply_filter(ctx, ctx->fileversion, &f[1], data1, count, order, fracbits); |
bf4a1f17 KS |
742 | } |
743 | ||
da55e098 JR |
744 | static void ape_apply_filters(APEContext *ctx, int32_t *decoded0, |
745 | int32_t *decoded1, int count) | |
bf4a1f17 KS |
746 | { |
747 | int i; | |
748 | ||
749 | for (i = 0; i < APE_FILTER_LEVELS; i++) { | |
750 | if (!ape_filter_orders[ctx->fset][i]) | |
751 | break; | |
da55e098 JR |
752 | apply_filter(ctx, ctx->filters[i], decoded0, decoded1, count, |
753 | ape_filter_orders[ctx->fset][i], | |
754 | ape_filter_fracbits[ctx->fset][i]); | |
bf4a1f17 KS |
755 | } |
756 | } | |
757 | ||
a4c32c9a | 758 | static int init_frame_decoder(APEContext *ctx) |
bf4a1f17 | 759 | { |
a4c32c9a JR |
760 | int i, ret; |
761 | if ((ret = init_entropy_decoder(ctx)) < 0) | |
762 | return ret; | |
bf4a1f17 KS |
763 | init_predictor_decoder(ctx); |
764 | ||
765 | for (i = 0; i < APE_FILTER_LEVELS; i++) { | |
766 | if (!ape_filter_orders[ctx->fset][i]) | |
767 | break; | |
da55e098 JR |
768 | init_filter(ctx, ctx->filters[i], ctx->filterbuf[i], |
769 | ape_filter_orders[ctx->fset][i]); | |
bf4a1f17 | 770 | } |
a4c32c9a | 771 | return 0; |
bf4a1f17 KS |
772 | } |
773 | ||
da55e098 | 774 | static void ape_unpack_mono(APEContext *ctx, int count) |
bf4a1f17 | 775 | { |
bf4a1f17 KS |
776 | int32_t *decoded0 = ctx->decoded0; |
777 | int32_t *decoded1 = ctx->decoded1; | |
778 | ||
779 | if (ctx->frameflags & APE_FRAMECODE_STEREO_SILENCE) { | |
780 | entropy_decode(ctx, count, 0); | |
781 | /* We are pure silence, so we're done. */ | |
782 | av_log(ctx->avctx, AV_LOG_DEBUG, "pure silence mono\n"); | |
783 | return; | |
784 | } | |
785 | ||
786 | entropy_decode(ctx, count, 0); | |
787 | ape_apply_filters(ctx, decoded0, NULL, count); | |
788 | ||
789 | /* Now apply the predictor decoding */ | |
790 | predictor_decode_mono(ctx, count); | |
791 | ||
792 | /* Pseudo-stereo - just copy left channel to right channel */ | |
793 | if (ctx->channels == 2) { | |
b9d6b027 | 794 | memcpy(decoded1, decoded0, count * sizeof(*decoded1)); |
bf4a1f17 KS |
795 | } |
796 | } | |
797 | ||
da55e098 | 798 | static void ape_unpack_stereo(APEContext *ctx, int count) |
bf4a1f17 KS |
799 | { |
800 | int32_t left, right; | |
801 | int32_t *decoded0 = ctx->decoded0; | |
802 | int32_t *decoded1 = ctx->decoded1; | |
803 | ||
804 | if (ctx->frameflags & APE_FRAMECODE_STEREO_SILENCE) { | |
805 | /* We are pure silence, so we're done. */ | |
806 | av_log(ctx->avctx, AV_LOG_DEBUG, "pure silence stereo\n"); | |
807 | return; | |
808 | } | |
809 | ||
810 | entropy_decode(ctx, count, 1); | |
811 | ape_apply_filters(ctx, decoded0, decoded1, count); | |
812 | ||
813 | /* Now apply the predictor decoding */ | |
814 | predictor_decode_stereo(ctx, count); | |
815 | ||
816 | /* Decorrelate and scale to output depth */ | |
817 | while (count--) { | |
818 | left = *decoded1 - (*decoded0 / 2); | |
819 | right = left + *decoded0; | |
820 | ||
821 | *(decoded0++) = left; | |
822 | *(decoded1++) = right; | |
823 | } | |
824 | } | |
825 | ||
0eea2129 JR |
826 | static int ape_decode_frame(AVCodecContext *avctx, void *data, |
827 | int *got_frame_ptr, AVPacket *avpkt) | |
bf4a1f17 | 828 | { |
7a00bbad | 829 | const uint8_t *buf = avpkt->data; |
bf4a1f17 | 830 | APEContext *s = avctx->priv_data; |
b60620bf PM |
831 | uint8_t *sample8; |
832 | int16_t *sample16; | |
833 | int32_t *sample24; | |
0eea2129 JR |
834 | int i, ret; |
835 | int blockstodecode; | |
c298b2b8 | 836 | int bytes_used = 0; |
bf4a1f17 | 837 | |
9a332644 JR |
838 | /* this should never be negative, but bad things will happen if it is, so |
839 | check it just to make sure. */ | |
840 | av_assert0(s->samples >= 0); | |
841 | ||
bf4a1f17 | 842 | if(!s->samples){ |
de157f21 | 843 | uint32_t nblocks, offset; |
0759c8eb | 844 | int buf_size; |
a4c32c9a | 845 | |
0759c8eb | 846 | if (!avpkt->size) { |
0eea2129 | 847 | *got_frame_ptr = 0; |
c298b2b8 JR |
848 | return 0; |
849 | } | |
0759c8eb | 850 | if (avpkt->size < 8) { |
a4c32c9a JR |
851 | av_log(avctx, AV_LOG_ERROR, "Packet is too small\n"); |
852 | return AVERROR_INVALIDDATA; | |
853 | } | |
0759c8eb JR |
854 | buf_size = avpkt->size & ~3; |
855 | if (buf_size != avpkt->size) { | |
856 | av_log(avctx, AV_LOG_WARNING, "packet size is not a multiple of 4. " | |
857 | "extra bytes at the end will be skipped.\n"); | |
858 | } | |
a4c32c9a | 859 | |
e4169612 JR |
860 | av_fast_malloc(&s->data, &s->data_size, buf_size); |
861 | if (!s->data) | |
11ca8b2d | 862 | return AVERROR(ENOMEM); |
f84a02c0 | 863 | s->dsp.bswap_buf((uint32_t*)s->data, (const uint32_t*)buf, buf_size >> 2); |
c298b2b8 | 864 | s->ptr = s->data; |
bf4a1f17 KS |
865 | s->data_end = s->data + buf_size; |
866 | ||
b7e51457 | 867 | nblocks = bytestream_get_be32(&s->ptr); |
fd244ae3 JR |
868 | offset = bytestream_get_be32(&s->ptr); |
869 | if (offset > 3) { | |
bf4a1f17 KS |
870 | av_log(avctx, AV_LOG_ERROR, "Incorrect offset passed\n"); |
871 | s->data = NULL; | |
91b71460 | 872 | return AVERROR_INVALIDDATA; |
bf4a1f17 | 873 | } |
a4c32c9a JR |
874 | if (s->data_end - s->ptr < offset) { |
875 | av_log(avctx, AV_LOG_ERROR, "Packet is too small\n"); | |
876 | return AVERROR_INVALIDDATA; | |
877 | } | |
fd244ae3 | 878 | s->ptr += offset; |
bf4a1f17 | 879 | |
2cab5784 JR |
880 | if (!nblocks || nblocks > INT_MAX) { |
881 | av_log(avctx, AV_LOG_ERROR, "Invalid sample count: %u.\n", nblocks); | |
882 | return AVERROR_INVALIDDATA; | |
bf4a1f17 | 883 | } |
ad17207b | 884 | s->samples = nblocks; |
bf4a1f17 KS |
885 | |
886 | memset(s->decoded0, 0, sizeof(s->decoded0)); | |
887 | memset(s->decoded1, 0, sizeof(s->decoded1)); | |
888 | ||
889 | /* Initialize the frame decoder */ | |
a4c32c9a JR |
890 | if (init_frame_decoder(s) < 0) { |
891 | av_log(avctx, AV_LOG_ERROR, "Error reading frame header\n"); | |
892 | return AVERROR_INVALIDDATA; | |
893 | } | |
c298b2b8 | 894 | |
0759c8eb | 895 | bytes_used = avpkt->size; |
bf4a1f17 KS |
896 | } |
897 | ||
898 | if (!s->data) { | |
0eea2129 | 899 | *got_frame_ptr = 0; |
0759c8eb | 900 | return avpkt->size; |
bf4a1f17 KS |
901 | } |
902 | ||
de157f21 | 903 | blockstodecode = FFMIN(BLOCKS_PER_LOOP, s->samples); |
bf4a1f17 | 904 | |
0eea2129 JR |
905 | /* get output buffer */ |
906 | s->frame.nb_samples = blockstodecode; | |
907 | if ((ret = avctx->get_buffer(avctx, &s->frame)) < 0) { | |
908 | av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n"); | |
909 | return ret; | |
4315c7d3 JR |
910 | } |
911 | ||
6a287b73 MN |
912 | s->error=0; |
913 | ||
bf4a1f17 KS |
914 | if ((s->channels == 1) || (s->frameflags & APE_FRAMECODE_PSEUDO_STEREO)) |
915 | ape_unpack_mono(s, blockstodecode); | |
916 | else | |
917 | ape_unpack_stereo(s, blockstodecode); | |
1e68cefe | 918 | emms_c(); |
bf4a1f17 | 919 | |
5b8009f4 | 920 | if (s->error) { |
6a287b73 MN |
921 | s->samples=0; |
922 | av_log(avctx, AV_LOG_ERROR, "Error decoding frame\n"); | |
91b71460 | 923 | return AVERROR_INVALIDDATA; |
6a287b73 MN |
924 | } |
925 | ||
b60620bf PM |
926 | switch (s->bps) { |
927 | case 8: | |
928 | sample8 = (uint8_t *)s->frame.data[0]; | |
929 | for (i = 0; i < blockstodecode; i++) { | |
930 | *sample8++ = (s->decoded0[i] + 0x80) & 0xff; | |
931 | if (s->channels == 2) | |
932 | *sample8++ = (s->decoded1[i] + 0x80) & 0xff; | |
933 | } | |
934 | break; | |
935 | case 16: | |
936 | sample16 = (int16_t *)s->frame.data[0]; | |
937 | for (i = 0; i < blockstodecode; i++) { | |
938 | *sample16++ = s->decoded0[i]; | |
939 | if (s->channels == 2) | |
940 | *sample16++ = s->decoded1[i]; | |
941 | } | |
942 | break; | |
943 | case 24: | |
944 | sample24 = (int32_t *)s->frame.data[0]; | |
945 | for (i = 0; i < blockstodecode; i++) { | |
946 | *sample24++ = s->decoded0[i] << 8; | |
947 | if (s->channels == 2) | |
948 | *sample24++ = s->decoded1[i] << 8; | |
949 | } | |
950 | break; | |
bf4a1f17 KS |
951 | } |
952 | ||
953 | s->samples -= blockstodecode; | |
954 | ||
0eea2129 JR |
955 | *got_frame_ptr = 1; |
956 | *(AVFrame *)data = s->frame; | |
957 | ||
bf4a1f17 KS |
958 | return bytes_used; |
959 | } | |
960 | ||
df92772c MR |
961 | static void ape_flush(AVCodecContext *avctx) |
962 | { | |
963 | APEContext *s = avctx->priv_data; | |
964 | s->samples= 0; | |
965 | } | |
966 | ||
d36beb3f | 967 | AVCodec ff_ape_decoder = { |
ec6402b7 AK |
968 | .name = "ape", |
969 | .type = AVMEDIA_TYPE_AUDIO, | |
970 | .id = CODEC_ID_APE, | |
971 | .priv_data_size = sizeof(APEContext), | |
972 | .init = ape_decode_init, | |
973 | .close = ape_decode_close, | |
974 | .decode = ape_decode_frame, | |
0eea2129 | 975 | .capabilities = CODEC_CAP_SUBFRAMES | CODEC_CAP_DELAY | CODEC_CAP_DR1, |
df92772c | 976 | .flush = ape_flush, |
fe4bf374 | 977 | .long_name = NULL_IF_CONFIG_SMALL("Monkey's Audio"), |
bf4a1f17 | 978 | }; |