2 * Monkey's Audio lossless audio decoder
3 * Copyright (c) 2007 Benjamin Zores <ben@geexbox.org>
4 * based upon libdemac from Dave Chapman.
6 * This file is part of Libav.
8 * Libav is free software; you can redistribute it and/or
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.
13 * Libav is distributed in the hope that it will be useful,
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.
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with Libav; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
25 #include "libavutil/avassert.h"
26 #include "libavutil/channel_layout.h"
27 #include "libavutil/opt.h"
31 #include "bytestream.h"
38 * Monkey's Audio lossless audio decoder
41 #define MAX_CHANNELS 2
42 #define MAX_BYTESPERSAMPLE 3
44 #define APE_FRAMECODE_MONO_SILENCE 1
45 #define APE_FRAMECODE_STEREO_SILENCE 3
46 #define APE_FRAMECODE_PSEUDO_STEREO 4
48 #define HISTORY_SIZE 512
49 #define PREDICTOR_ORDER 8
50 /** Total size of all predictor histories */
51 #define PREDICTOR_SIZE 50
53 #define YDELAYA (18 + PREDICTOR_ORDER*4)
54 #define YDELAYB (18 + PREDICTOR_ORDER*3)
55 #define XDELAYA (18 + PREDICTOR_ORDER*2)
56 #define XDELAYB (18 + PREDICTOR_ORDER)
58 #define YADAPTCOEFFSA 18
59 #define XADAPTCOEFFSA 14
60 #define YADAPTCOEFFSB 10
61 #define XADAPTCOEFFSB 5
64 * Possible compression levels
67 enum APECompressionLevel {
68 COMPRESSION_LEVEL_FAST = 1000,
69 COMPRESSION_LEVEL_NORMAL = 2000,
70 COMPRESSION_LEVEL_HIGH = 3000,
71 COMPRESSION_LEVEL_EXTRA_HIGH = 4000,
72 COMPRESSION_LEVEL_INSANE = 5000
76 #define APE_FILTER_LEVELS 3
78 /** Filter orders depending on compression level */
79 static const uint16_t ape_filter_orders[5][APE_FILTER_LEVELS] = {
87 /** Filter fraction bits depending on compression level */
88 static const uint8_t ape_filter_fracbits[5][APE_FILTER_LEVELS] = {
97 /** Filters applied to the decoded data */
98 typedef struct APEFilter {
99 int16_t *coeffs; ///< actual coefficients used in filtering
100 int16_t *adaptcoeffs; ///< adaptive filter coefficients used for correcting of actual filter coefficients
101 int16_t *historybuffer; ///< filter memory
102 int16_t *delay; ///< filtered values
107 typedef struct APERice {
112 typedef struct APERangecoder {
113 uint32_t low; ///< low end of interval
114 uint32_t range; ///< length of interval
115 uint32_t help; ///< bytes_to_follow resp. intermediate value
116 unsigned int buffer; ///< buffer for input/output
119 /** Filter histories */
120 typedef struct APEPredictor {
128 int32_t coeffsA[2][4]; ///< adaption coefficients
129 int32_t coeffsB[2][5]; ///< adaption coefficients
130 int32_t historybuffer[HISTORY_SIZE + PREDICTOR_SIZE];
132 unsigned int sample_pos;
135 /** Decoder context */
136 typedef struct APEContext {
137 AVClass *class; ///< class for AVOptions
138 AVCodecContext *avctx;
142 int samples; ///< samples left to decode in current frame
145 int fileversion; ///< codec version, very important in decoding process
146 int compression_level; ///< compression levels
147 int fset; ///< which filter set to use (calculated from compression level)
148 int flags; ///< global decoder flags
150 uint32_t CRC; ///< frame CRC
151 int frameflags; ///< frame flags
152 APEPredictor predictor; ///< predictor used for final reconstruction
154 int32_t *decoded_buffer;
156 int32_t *decoded[MAX_CHANNELS]; ///< decoded data for each channel
157 int blocks_per_loop; ///< maximum number of samples to decode for each call
159 int16_t* filterbuf[APE_FILTER_LEVELS]; ///< filter memory
161 APERangecoder rc; ///< rangecoder used to decode actual values
162 APERice riceX; ///< rice code parameters for the second channel
163 APERice riceY; ///< rice code parameters for the first channel
164 APEFilter filters[APE_FILTER_LEVELS][2]; ///< filters used for reconstruction
167 uint8_t *data; ///< current frame data
168 uint8_t *data_end; ///< frame data end
169 int data_size; ///< frame data allocated size
170 const uint8_t *ptr; ///< current position in frame data
174 void (*entropy_decode_mono)(struct APEContext *ctx, int blockstodecode);
175 void (*entropy_decode_stereo)(struct APEContext *ctx, int blockstodecode);
176 void (*predictor_decode_mono)(struct APEContext *ctx, int count);
177 void (*predictor_decode_stereo)(struct APEContext *ctx, int count);
180 static void ape_apply_filters(APEContext *ctx, int32_t *decoded0,
181 int32_t *decoded1, int count);
183 static void entropy_decode_mono_0000(APEContext *ctx, int blockstodecode);
184 static void entropy_decode_stereo_0000(APEContext *ctx, int blockstodecode);
185 static void entropy_decode_mono_3860(APEContext *ctx, int blockstodecode);
186 static void entropy_decode_stereo_3860(APEContext *ctx, int blockstodecode);
187 static void entropy_decode_mono_3900(APEContext *ctx, int blockstodecode);
188 static void entropy_decode_stereo_3900(APEContext *ctx, int blockstodecode);
189 static void entropy_decode_stereo_3930(APEContext *ctx, int blockstodecode);
190 static void entropy_decode_mono_3990(APEContext *ctx, int blockstodecode);
191 static void entropy_decode_stereo_3990(APEContext *ctx, int blockstodecode);
193 static void predictor_decode_mono_3800(APEContext *ctx, int count);
194 static void predictor_decode_stereo_3800(APEContext *ctx, int count);
195 static void predictor_decode_mono_3930(APEContext *ctx, int count);
196 static void predictor_decode_stereo_3930(APEContext *ctx, int count);
197 static void predictor_decode_mono_3950(APEContext *ctx, int count);
198 static void predictor_decode_stereo_3950(APEContext *ctx, int count);
200 static av_cold int ape_decode_close(AVCodecContext *avctx)
202 APEContext *s = avctx->priv_data;
205 for (i = 0; i < APE_FILTER_LEVELS; i++)
206 av_freep(&s->filterbuf[i]);
208 av_freep(&s->decoded_buffer);
210 s->decoded_size = s->data_size = 0;
215 static int32_t scalarproduct_and_madd_int16_c(int16_t *v1, const int16_t *v2,
223 *v1++ += mul * *v3++;
228 static av_cold int ape_decode_init(AVCodecContext *avctx)
230 APEContext *s = avctx->priv_data;
233 if (avctx->extradata_size != 6) {
234 av_log(avctx, AV_LOG_ERROR, "Incorrect extradata\n");
235 return AVERROR(EINVAL);
237 if (avctx->channels > 2) {
238 av_log(avctx, AV_LOG_ERROR, "Only mono and stereo is supported\n");
239 return AVERROR(EINVAL);
241 s->bps = avctx->bits_per_coded_sample;
244 avctx->sample_fmt = AV_SAMPLE_FMT_U8P;
247 avctx->sample_fmt = AV_SAMPLE_FMT_S16P;
250 avctx->sample_fmt = AV_SAMPLE_FMT_S32P;
253 avpriv_request_sample(avctx,
254 "%d bits per coded sample", s->bps);
255 return AVERROR_PATCHWELCOME;
258 s->channels = avctx->channels;
259 s->fileversion = AV_RL16(avctx->extradata);
260 s->compression_level = AV_RL16(avctx->extradata + 2);
261 s->flags = AV_RL16(avctx->extradata + 4);
263 av_log(avctx, AV_LOG_DEBUG, "Compression Level: %d - Flags: %d\n",
264 s->compression_level, s->flags);
265 if (s->compression_level % 1000 || s->compression_level > COMPRESSION_LEVEL_INSANE ||
266 (s->fileversion < 3930 && s->compression_level == COMPRESSION_LEVEL_INSANE)) {
267 av_log(avctx, AV_LOG_ERROR, "Incorrect compression level %d\n",
268 s->compression_level);
269 return AVERROR_INVALIDDATA;
271 s->fset = s->compression_level / 1000 - 1;
272 for (i = 0; i < APE_FILTER_LEVELS; i++) {
273 if (!ape_filter_orders[s->fset][i])
275 FF_ALLOC_OR_GOTO(avctx, s->filterbuf[i],
276 (ape_filter_orders[s->fset][i] * 3 + HISTORY_SIZE) * 4,
280 if (s->fileversion < 3860) {
281 s->entropy_decode_mono = entropy_decode_mono_0000;
282 s->entropy_decode_stereo = entropy_decode_stereo_0000;
283 } else if (s->fileversion < 3900) {
284 s->entropy_decode_mono = entropy_decode_mono_3860;
285 s->entropy_decode_stereo = entropy_decode_stereo_3860;
286 } else if (s->fileversion < 3930) {
287 s->entropy_decode_mono = entropy_decode_mono_3900;
288 s->entropy_decode_stereo = entropy_decode_stereo_3900;
289 } else if (s->fileversion < 3990) {
290 s->entropy_decode_mono = entropy_decode_mono_3900;
291 s->entropy_decode_stereo = entropy_decode_stereo_3930;
293 s->entropy_decode_mono = entropy_decode_mono_3990;
294 s->entropy_decode_stereo = entropy_decode_stereo_3990;
297 if (s->fileversion < 3930) {
298 s->predictor_decode_mono = predictor_decode_mono_3800;
299 s->predictor_decode_stereo = predictor_decode_stereo_3800;
300 } else if (s->fileversion < 3950) {
301 s->predictor_decode_mono = predictor_decode_mono_3930;
302 s->predictor_decode_stereo = predictor_decode_stereo_3930;
304 s->predictor_decode_mono = predictor_decode_mono_3950;
305 s->predictor_decode_stereo = predictor_decode_stereo_3950;
308 s->adsp.scalarproduct_and_madd_int16 = scalarproduct_and_madd_int16_c;
311 ff_apedsp_init_arm(&s->adsp);
313 ff_apedsp_init_ppc(&s->adsp);
315 ff_apedsp_init_x86(&s->adsp);
317 ff_dsputil_init(&s->dsp, avctx);
318 avctx->channel_layout = (avctx->channels==2) ? AV_CH_LAYOUT_STEREO : AV_CH_LAYOUT_MONO;
322 ape_decode_close(avctx);
323 return AVERROR(ENOMEM);
327 * @name APE range decoding functions
332 #define TOP_VALUE ((unsigned int)1 << (CODE_BITS-1))
333 #define SHIFT_BITS (CODE_BITS - 9)
334 #define EXTRA_BITS ((CODE_BITS-2) % 8 + 1)
335 #define BOTTOM_VALUE (TOP_VALUE >> 8)
337 /** Start the decoder */
338 static inline void range_start_decoding(APEContext *ctx)
340 ctx->rc.buffer = bytestream_get_byte(&ctx->ptr);
341 ctx->rc.low = ctx->rc.buffer >> (8 - EXTRA_BITS);
342 ctx->rc.range = (uint32_t) 1 << EXTRA_BITS;
345 /** Perform normalization */
346 static inline void range_dec_normalize(APEContext *ctx)
348 while (ctx->rc.range <= BOTTOM_VALUE) {
349 ctx->rc.buffer <<= 8;
350 if(ctx->ptr < ctx->data_end) {
351 ctx->rc.buffer += *ctx->ptr;
356 ctx->rc.low = (ctx->rc.low << 8) | ((ctx->rc.buffer >> 1) & 0xFF);
362 * Calculate culmulative frequency for next symbol. Does NO update!
363 * @param ctx decoder context
364 * @param tot_f is the total frequency or (code_value)1<<shift
365 * @return the culmulative frequency
367 static inline int range_decode_culfreq(APEContext *ctx, int tot_f)
369 range_dec_normalize(ctx);
370 ctx->rc.help = ctx->rc.range / tot_f;
371 return ctx->rc.low / ctx->rc.help;
375 * Decode value with given size in bits
376 * @param ctx decoder context
377 * @param shift number of bits to decode
379 static inline int range_decode_culshift(APEContext *ctx, int shift)
381 range_dec_normalize(ctx);
382 ctx->rc.help = ctx->rc.range >> shift;
383 return ctx->rc.low / ctx->rc.help;
388 * Update decoding state
389 * @param ctx decoder context
390 * @param sy_f the interval length (frequency of the symbol)
391 * @param lt_f the lower end (frequency sum of < symbols)
393 static inline void range_decode_update(APEContext *ctx, int sy_f, int lt_f)
395 ctx->rc.low -= ctx->rc.help * lt_f;
396 ctx->rc.range = ctx->rc.help * sy_f;
399 /** Decode n bits (n <= 16) without modelling */
400 static inline int range_decode_bits(APEContext *ctx, int n)
402 int sym = range_decode_culshift(ctx, n);
403 range_decode_update(ctx, 1, sym);
408 #define MODEL_ELEMENTS 64
411 * Fixed probabilities for symbols in Monkey Audio version 3.97
413 static const uint16_t counts_3970[22] = {
414 0, 14824, 28224, 39348, 47855, 53994, 58171, 60926,
415 62682, 63786, 64463, 64878, 65126, 65276, 65365, 65419,
416 65450, 65469, 65480, 65487, 65491, 65493,
420 * Probability ranges for symbols in Monkey Audio version 3.97
422 static const uint16_t counts_diff_3970[21] = {
423 14824, 13400, 11124, 8507, 6139, 4177, 2755, 1756,
424 1104, 677, 415, 248, 150, 89, 54, 31,
429 * Fixed probabilities for symbols in Monkey Audio version 3.98
431 static const uint16_t counts_3980[22] = {
432 0, 19578, 36160, 48417, 56323, 60899, 63265, 64435,
433 64971, 65232, 65351, 65416, 65447, 65466, 65476, 65482,
434 65485, 65488, 65490, 65491, 65492, 65493,
438 * Probability ranges for symbols in Monkey Audio version 3.98
440 static const uint16_t counts_diff_3980[21] = {
441 19578, 16582, 12257, 7906, 4576, 2366, 1170, 536,
442 261, 119, 65, 31, 19, 10, 6, 3,
448 * @param ctx decoder context
449 * @param counts probability range start position
450 * @param counts_diff probability range widths
452 static inline int range_get_symbol(APEContext *ctx,
453 const uint16_t counts[],
454 const uint16_t counts_diff[])
458 cf = range_decode_culshift(ctx, 16);
461 symbol= cf - 65535 + 63;
462 range_decode_update(ctx, 1, cf);
467 /* figure out the symbol inefficiently; a binary search would be much better */
468 for (symbol = 0; counts[symbol + 1] <= cf; symbol++);
470 range_decode_update(ctx, counts_diff[symbol], counts[symbol]);
474 /** @} */ // group rangecoder
476 static inline void update_rice(APERice *rice, unsigned int x)
478 int lim = rice->k ? (1 << (rice->k + 4)) : 0;
479 rice->ksum += ((x + 1) / 2) - ((rice->ksum + 16) >> 5);
481 if (rice->ksum < lim)
483 else if (rice->ksum >= (1 << (rice->k + 5)))
487 static inline int get_rice_ook(GetBitContext *gb, int k)
491 x = get_unary(gb, 1, get_bits_left(gb));
494 x = (x << k) | get_bits(gb, k);
499 static inline int ape_decode_value_3860(APEContext *ctx, GetBitContext *gb,
502 unsigned int x, overflow;
504 overflow = get_unary(gb, 1, get_bits_left(gb));
506 if (ctx->fileversion > 3880) {
507 while (overflow >= 16) {
516 x = (overflow << rice->k) + get_bits(gb, rice->k);
518 rice->ksum += x - (rice->ksum + 8 >> 4);
519 if (rice->ksum < (rice->k ? 1 << (rice->k + 4) : 0))
521 else if (rice->ksum >= (1 << (rice->k + 5)) && rice->k < 24)
524 /* Convert to signed */
531 static inline int ape_decode_value_3900(APEContext *ctx, APERice *rice)
533 unsigned int x, overflow;
536 overflow = range_get_symbol(ctx, counts_3970, counts_diff_3970);
538 if (overflow == (MODEL_ELEMENTS - 1)) {
539 tmpk = range_decode_bits(ctx, 5);
542 tmpk = (rice->k < 1) ? 0 : rice->k - 1;
544 if (tmpk <= 16 || ctx->fileversion < 3910)
545 x = range_decode_bits(ctx, tmpk);
546 else if (tmpk <= 32) {
547 x = range_decode_bits(ctx, 16);
548 x |= (range_decode_bits(ctx, tmpk - 16) << 16);
550 av_log(ctx->avctx, AV_LOG_ERROR, "Too many bits: %d\n", tmpk);
551 return AVERROR_INVALIDDATA;
553 x += overflow << tmpk;
555 update_rice(rice, x);
557 /* Convert to signed */
564 static inline int ape_decode_value_3990(APEContext *ctx, APERice *rice)
566 unsigned int x, overflow;
569 pivot = rice->ksum >> 5;
573 overflow = range_get_symbol(ctx, counts_3980, counts_diff_3980);
575 if (overflow == (MODEL_ELEMENTS - 1)) {
576 overflow = range_decode_bits(ctx, 16) << 16;
577 overflow |= range_decode_bits(ctx, 16);
580 if (pivot < 0x10000) {
581 base = range_decode_culfreq(ctx, pivot);
582 range_decode_update(ctx, 1, base);
584 int base_hi = pivot, base_lo;
587 while (base_hi & ~0xFFFF) {
591 base_hi = range_decode_culfreq(ctx, base_hi + 1);
592 range_decode_update(ctx, 1, base_hi);
593 base_lo = range_decode_culfreq(ctx, 1 << bbits);
594 range_decode_update(ctx, 1, base_lo);
596 base = (base_hi << bbits) + base_lo;
599 x = base + overflow * pivot;
601 update_rice(rice, x);
603 /* Convert to signed */
610 static void decode_array_0000(APEContext *ctx, GetBitContext *gb,
611 int32_t *out, APERice *rice, int blockstodecode)
614 int ksummax, ksummin;
617 for (i = 0; i < 5; i++) {
618 out[i] = get_rice_ook(&ctx->gb, 10);
619 rice->ksum += out[i];
621 rice->k = av_log2(rice->ksum / 10) + 1;
622 for (; i < 64; i++) {
623 out[i] = get_rice_ook(&ctx->gb, rice->k);
624 rice->ksum += out[i];
625 rice->k = av_log2(rice->ksum / ((i + 1) * 2)) + 1;
627 ksummax = 1 << rice->k + 7;
628 ksummin = rice->k ? (1 << rice->k + 6) : 0;
629 for (; i < blockstodecode; i++) {
630 out[i] = get_rice_ook(&ctx->gb, rice->k);
631 rice->ksum += out[i] - out[i - 64];
632 while (rice->ksum < ksummin) {
634 ksummin = rice->k ? ksummin >> 1 : 0;
637 while (rice->ksum >= ksummax) {
642 ksummin = ksummin ? ksummin << 1 : 128;
646 for (i = 0; i < blockstodecode; i++) {
648 out[i] = (out[i] >> 1) + 1;
650 out[i] = -(out[i] >> 1);
654 static void entropy_decode_mono_0000(APEContext *ctx, int blockstodecode)
656 decode_array_0000(ctx, &ctx->gb, ctx->decoded[0], &ctx->riceY,
660 static void entropy_decode_stereo_0000(APEContext *ctx, int blockstodecode)
662 decode_array_0000(ctx, &ctx->gb, ctx->decoded[0], &ctx->riceY,
664 decode_array_0000(ctx, &ctx->gb, ctx->decoded[1], &ctx->riceX,
668 static void entropy_decode_mono_3860(APEContext *ctx, int blockstodecode)
670 int32_t *decoded0 = ctx->decoded[0];
672 while (blockstodecode--)
673 *decoded0++ = ape_decode_value_3860(ctx, &ctx->gb, &ctx->riceY);
676 static void entropy_decode_stereo_3860(APEContext *ctx, int blockstodecode)
678 int32_t *decoded0 = ctx->decoded[0];
679 int32_t *decoded1 = ctx->decoded[1];
680 int blocks = blockstodecode;
682 while (blockstodecode--)
683 *decoded0++ = ape_decode_value_3860(ctx, &ctx->gb, &ctx->riceY);
685 *decoded1++ = ape_decode_value_3860(ctx, &ctx->gb, &ctx->riceX);
688 static void entropy_decode_mono_3900(APEContext *ctx, int blockstodecode)
690 int32_t *decoded0 = ctx->decoded[0];
692 while (blockstodecode--)
693 *decoded0++ = ape_decode_value_3900(ctx, &ctx->riceY);
696 static void entropy_decode_stereo_3900(APEContext *ctx, int blockstodecode)
698 int32_t *decoded0 = ctx->decoded[0];
699 int32_t *decoded1 = ctx->decoded[1];
700 int blocks = blockstodecode;
702 while (blockstodecode--)
703 *decoded0++ = ape_decode_value_3900(ctx, &ctx->riceY);
704 range_dec_normalize(ctx);
705 // because of some implementation peculiarities we need to backpedal here
707 range_start_decoding(ctx);
709 *decoded1++ = ape_decode_value_3900(ctx, &ctx->riceX);
712 static void entropy_decode_stereo_3930(APEContext *ctx, int blockstodecode)
714 int32_t *decoded0 = ctx->decoded[0];
715 int32_t *decoded1 = ctx->decoded[1];
717 while (blockstodecode--) {
718 *decoded0++ = ape_decode_value_3900(ctx, &ctx->riceY);
719 *decoded1++ = ape_decode_value_3900(ctx, &ctx->riceX);
723 static void entropy_decode_mono_3990(APEContext *ctx, int blockstodecode)
725 int32_t *decoded0 = ctx->decoded[0];
727 while (blockstodecode--)
728 *decoded0++ = ape_decode_value_3990(ctx, &ctx->riceY);
731 static void entropy_decode_stereo_3990(APEContext *ctx, int blockstodecode)
733 int32_t *decoded0 = ctx->decoded[0];
734 int32_t *decoded1 = ctx->decoded[1];
736 while (blockstodecode--) {
737 *decoded0++ = ape_decode_value_3990(ctx, &ctx->riceY);
738 *decoded1++ = ape_decode_value_3990(ctx, &ctx->riceX);
742 static int init_entropy_decoder(APEContext *ctx)
745 if (ctx->fileversion >= 3900) {
746 if (ctx->data_end - ctx->ptr < 6)
747 return AVERROR_INVALIDDATA;
748 ctx->CRC = bytestream_get_be32(&ctx->ptr);
750 ctx->CRC = get_bits_long(&ctx->gb, 32);
753 /* Read the frame flags if they exist */
755 if ((ctx->fileversion > 3820) && (ctx->CRC & 0x80000000)) {
756 ctx->CRC &= ~0x80000000;
758 if (ctx->data_end - ctx->ptr < 6)
759 return AVERROR_INVALIDDATA;
760 ctx->frameflags = bytestream_get_be32(&ctx->ptr);
763 /* Initialize the rice structs */
765 ctx->riceX.ksum = (1 << ctx->riceX.k) * 16;
767 ctx->riceY.ksum = (1 << ctx->riceY.k) * 16;
769 if (ctx->fileversion >= 3900) {
770 /* The first 8 bits of input are ignored. */
773 range_start_decoding(ctx);
779 static const int32_t initial_coeffs_fast_3320[1] = {
783 static const int32_t initial_coeffs_a_3800[3] = {
787 static const int32_t initial_coeffs_b_3800[2] = {
791 static const int32_t initial_coeffs_3930[4] = {
795 static void init_predictor_decoder(APEContext *ctx)
797 APEPredictor *p = &ctx->predictor;
799 /* Zero the history buffers */
800 memset(p->historybuffer, 0, PREDICTOR_SIZE * sizeof(*p->historybuffer));
801 p->buf = p->historybuffer;
803 /* Initialize and zero the coefficients */
804 if (ctx->fileversion < 3930) {
805 if (ctx->compression_level == COMPRESSION_LEVEL_FAST) {
806 memcpy(p->coeffsA[0], initial_coeffs_fast_3320,
807 sizeof(initial_coeffs_fast_3320));
808 memcpy(p->coeffsA[1], initial_coeffs_fast_3320,
809 sizeof(initial_coeffs_fast_3320));
811 memcpy(p->coeffsA[0], initial_coeffs_a_3800,
812 sizeof(initial_coeffs_a_3800));
813 memcpy(p->coeffsA[1], initial_coeffs_a_3800,
814 sizeof(initial_coeffs_a_3800));
817 memcpy(p->coeffsA[0], initial_coeffs_3930, sizeof(initial_coeffs_3930));
818 memcpy(p->coeffsA[1], initial_coeffs_3930, sizeof(initial_coeffs_3930));
820 memset(p->coeffsB, 0, sizeof(p->coeffsB));
821 if (ctx->fileversion < 3930) {
822 memcpy(p->coeffsB[0], initial_coeffs_b_3800,
823 sizeof(initial_coeffs_b_3800));
824 memcpy(p->coeffsB[1], initial_coeffs_b_3800,
825 sizeof(initial_coeffs_b_3800));
828 p->filterA[0] = p->filterA[1] = 0;
829 p->filterB[0] = p->filterB[1] = 0;
830 p->lastA[0] = p->lastA[1] = 0;
835 /** Get inverse sign of integer (-1 for positive, 1 for negative and 0 for zero) */
836 static inline int APESIGN(int32_t x) {
837 return (x < 0) - (x > 0);
840 static av_always_inline int filter_fast_3320(APEPredictor *p,
841 const int decoded, const int filter,
846 p->buf[delayA] = p->lastA[filter];
847 if (p->sample_pos < 3) {
848 p->lastA[filter] = decoded;
849 p->filterA[filter] = decoded;
853 predictionA = p->buf[delayA] * 2 - p->buf[delayA - 1];
854 p->lastA[filter] = decoded + (predictionA * p->coeffsA[filter][0] >> 9);
856 if ((decoded ^ predictionA) > 0)
857 p->coeffsA[filter][0]++;
859 p->coeffsA[filter][0]--;
861 p->filterA[filter] += p->lastA[filter];
863 return p->filterA[filter];
866 static av_always_inline int filter_3800(APEPredictor *p,
867 const int decoded, const int filter,
868 const int delayA, const int delayB,
869 const int start, const int shift)
871 int32_t predictionA, predictionB, sign;
872 int32_t d0, d1, d2, d3, d4;
874 p->buf[delayA] = p->lastA[filter];
875 p->buf[delayB] = p->filterB[filter];
876 if (p->sample_pos < start) {
877 predictionA = decoded + p->filterA[filter];
878 p->lastA[filter] = decoded;
879 p->filterB[filter] = decoded;
880 p->filterA[filter] = predictionA;
884 d1 = (p->buf[delayA] - p->buf[delayA - 1]) << 1;
885 d0 = p->buf[delayA] + ((p->buf[delayA - 2] - p->buf[delayA - 1]) << 3);
886 d3 = p->buf[delayB] * 2 - p->buf[delayB - 1];
889 predictionA = d0 * p->coeffsA[filter][0] +
890 d1 * p->coeffsA[filter][1] +
891 d2 * p->coeffsA[filter][2];
893 sign = APESIGN(decoded);
894 p->coeffsA[filter][0] += (((d0 >> 30) & 2) - 1) * sign;
895 p->coeffsA[filter][1] += (((d1 >> 28) & 8) - 4) * sign;
896 p->coeffsA[filter][2] += (((d2 >> 28) & 8) - 4) * sign;
898 predictionB = d3 * p->coeffsB[filter][0] -
899 d4 * p->coeffsB[filter][1];
900 p->lastA[filter] = decoded + (predictionA >> 11);
901 sign = APESIGN(p->lastA[filter]);
902 p->coeffsB[filter][0] += (((d3 >> 29) & 4) - 2) * sign;
903 p->coeffsB[filter][1] -= (((d4 >> 30) & 2) - 1) * sign;
905 p->filterB[filter] = p->lastA[filter] + (predictionB >> shift);
906 p->filterA[filter] = p->filterB[filter] + ((p->filterA[filter] * 31) >> 5);
908 return p->filterA[filter];
911 static void long_filter_high_3800(int32_t *buffer, int order, int shift,
912 int32_t *coeffs, int32_t *delay, int length)
915 int32_t dotprod, sign;
917 memset(coeffs, 0, order * sizeof(*coeffs));
918 for (i = 0; i < order; i++)
919 delay[i] = buffer[i];
920 for (i = order; i < length; i++) {
922 sign = APESIGN(buffer[i]);
923 for (j = 0; j < order; j++) {
924 dotprod += delay[j] * coeffs[j];
925 coeffs[j] -= (((delay[j] >> 30) & 2) - 1) * sign;
927 buffer[i] -= dotprod >> shift;
928 for (j = 0; j < order - 1; j++)
929 delay[j] = delay[j + 1];
930 delay[order - 1] = buffer[i];
934 static void long_filter_ehigh_3830(int32_t *buffer, int length)
937 int32_t dotprod, sign;
938 int32_t coeffs[8], delay[8];
940 memset(coeffs, 0, sizeof(coeffs));
941 memset(delay, 0, sizeof(delay));
942 for (i = 0; i < length; i++) {
944 sign = APESIGN(buffer[i]);
945 for (j = 7; j >= 0; j--) {
946 dotprod += delay[j] * coeffs[j];
947 coeffs[j] -= (((delay[j] >> 30) & 2) - 1) * sign;
949 for (j = 7; j > 0; j--)
950 delay[j] = delay[j - 1];
951 delay[0] = buffer[i];
952 buffer[i] -= dotprod >> 9;
956 static void predictor_decode_stereo_3800(APEContext *ctx, int count)
958 APEPredictor *p = &ctx->predictor;
959 int32_t *decoded0 = ctx->decoded[0];
960 int32_t *decoded1 = ctx->decoded[1];
961 int32_t coeffs[256], delay[256];
962 int start = 4, shift = 10;
964 if (ctx->compression_level == COMPRESSION_LEVEL_HIGH) {
966 long_filter_high_3800(decoded0, 16, 9, coeffs, delay, count);
967 long_filter_high_3800(decoded1, 16, 9, coeffs, delay, count);
968 } else if (ctx->compression_level == COMPRESSION_LEVEL_EXTRA_HIGH) {
969 int order = 128, shift2 = 11;
971 if (ctx->fileversion >= 3830) {
975 long_filter_ehigh_3830(decoded0 + order, count - order);
976 long_filter_ehigh_3830(decoded1 + order, count - order);
979 long_filter_high_3800(decoded0, order, shift2, coeffs, delay, count);
980 long_filter_high_3800(decoded1, order, shift2, coeffs, delay, count);
984 int X = *decoded0, Y = *decoded1;
985 if (ctx->compression_level == COMPRESSION_LEVEL_FAST) {
986 *decoded0 = filter_fast_3320(p, Y, 0, YDELAYA);
988 *decoded1 = filter_fast_3320(p, X, 1, XDELAYA);
991 *decoded0 = filter_3800(p, Y, 0, YDELAYA, YDELAYB,
994 *decoded1 = filter_3800(p, X, 1, XDELAYA, XDELAYB,
1003 /* Have we filled the history buffer? */
1004 if (p->buf == p->historybuffer + HISTORY_SIZE) {
1005 memmove(p->historybuffer, p->buf,
1006 PREDICTOR_SIZE * sizeof(*p->historybuffer));
1007 p->buf = p->historybuffer;
1012 static void predictor_decode_mono_3800(APEContext *ctx, int count)
1014 APEPredictor *p = &ctx->predictor;
1015 int32_t *decoded0 = ctx->decoded[0];
1016 int32_t coeffs[256], delay[256];
1017 int start = 4, shift = 10;
1019 if (ctx->compression_level == COMPRESSION_LEVEL_HIGH) {
1021 long_filter_high_3800(decoded0, 16, 9, coeffs, delay, count);
1022 } else if (ctx->compression_level == COMPRESSION_LEVEL_EXTRA_HIGH) {
1023 int order = 128, shift2 = 11;
1025 if (ctx->fileversion >= 3830) {
1029 long_filter_ehigh_3830(decoded0 + order, count - order);
1032 long_filter_high_3800(decoded0, order, shift2, coeffs, delay, count);
1036 if (ctx->compression_level == COMPRESSION_LEVEL_FAST) {
1037 *decoded0 = filter_fast_3320(p, *decoded0, 0, YDELAYA);
1040 *decoded0 = filter_3800(p, *decoded0, 0, YDELAYA, YDELAYB,
1049 /* Have we filled the history buffer? */
1050 if (p->buf == p->historybuffer + HISTORY_SIZE) {
1051 memmove(p->historybuffer, p->buf,
1052 PREDICTOR_SIZE * sizeof(*p->historybuffer));
1053 p->buf = p->historybuffer;
1058 static av_always_inline int predictor_update_3930(APEPredictor *p,
1059 const int decoded, const int filter,
1062 int32_t predictionA, sign;
1063 int32_t d0, d1, d2, d3;
1065 p->buf[delayA] = p->lastA[filter];
1066 d0 = p->buf[delayA ];
1067 d1 = p->buf[delayA ] - p->buf[delayA - 1];
1068 d2 = p->buf[delayA - 1] - p->buf[delayA - 2];
1069 d3 = p->buf[delayA - 2] - p->buf[delayA - 3];
1071 predictionA = d0 * p->coeffsA[filter][0] +
1072 d1 * p->coeffsA[filter][1] +
1073 d2 * p->coeffsA[filter][2] +
1074 d3 * p->coeffsA[filter][3];
1076 p->lastA[filter] = decoded + (predictionA >> 9);
1077 p->filterA[filter] = p->lastA[filter] + ((p->filterA[filter] * 31) >> 5);
1079 sign = APESIGN(decoded);
1080 p->coeffsA[filter][0] += ((d0 < 0) * 2 - 1) * sign;
1081 p->coeffsA[filter][1] += ((d1 < 0) * 2 - 1) * sign;
1082 p->coeffsA[filter][2] += ((d2 < 0) * 2 - 1) * sign;
1083 p->coeffsA[filter][3] += ((d3 < 0) * 2 - 1) * sign;
1085 return p->filterA[filter];
1088 static void predictor_decode_stereo_3930(APEContext *ctx, int count)
1090 APEPredictor *p = &ctx->predictor;
1091 int32_t *decoded0 = ctx->decoded[0];
1092 int32_t *decoded1 = ctx->decoded[1];
1094 ape_apply_filters(ctx, ctx->decoded[0], ctx->decoded[1], count);
1098 int Y = *decoded1, X = *decoded0;
1099 *decoded0 = predictor_update_3930(p, Y, 0, YDELAYA);
1101 *decoded1 = predictor_update_3930(p, X, 1, XDELAYA);
1107 /* Have we filled the history buffer? */
1108 if (p->buf == p->historybuffer + HISTORY_SIZE) {
1109 memmove(p->historybuffer, p->buf,
1110 PREDICTOR_SIZE * sizeof(*p->historybuffer));
1111 p->buf = p->historybuffer;
1116 static void predictor_decode_mono_3930(APEContext *ctx, int count)
1118 APEPredictor *p = &ctx->predictor;
1119 int32_t *decoded0 = ctx->decoded[0];
1121 ape_apply_filters(ctx, ctx->decoded[0], NULL, count);
1124 *decoded0 = predictor_update_3930(p, *decoded0, 0, YDELAYA);
1129 /* Have we filled the history buffer? */
1130 if (p->buf == p->historybuffer + HISTORY_SIZE) {
1131 memmove(p->historybuffer, p->buf,
1132 PREDICTOR_SIZE * sizeof(*p->historybuffer));
1133 p->buf = p->historybuffer;
1138 static av_always_inline int predictor_update_filter(APEPredictor *p,
1139 const int decoded, const int filter,
1140 const int delayA, const int delayB,
1141 const int adaptA, const int adaptB)
1143 int32_t predictionA, predictionB, sign;
1145 p->buf[delayA] = p->lastA[filter];
1146 p->buf[adaptA] = APESIGN(p->buf[delayA]);
1147 p->buf[delayA - 1] = p->buf[delayA] - p->buf[delayA - 1];
1148 p->buf[adaptA - 1] = APESIGN(p->buf[delayA - 1]);
1150 predictionA = p->buf[delayA ] * p->coeffsA[filter][0] +
1151 p->buf[delayA - 1] * p->coeffsA[filter][1] +
1152 p->buf[delayA - 2] * p->coeffsA[filter][2] +
1153 p->buf[delayA - 3] * p->coeffsA[filter][3];
1155 /* Apply a scaled first-order filter compression */
1156 p->buf[delayB] = p->filterA[filter ^ 1] - ((p->filterB[filter] * 31) >> 5);
1157 p->buf[adaptB] = APESIGN(p->buf[delayB]);
1158 p->buf[delayB - 1] = p->buf[delayB] - p->buf[delayB - 1];
1159 p->buf[adaptB - 1] = APESIGN(p->buf[delayB - 1]);
1160 p->filterB[filter] = p->filterA[filter ^ 1];
1162 predictionB = p->buf[delayB ] * p->coeffsB[filter][0] +
1163 p->buf[delayB - 1] * p->coeffsB[filter][1] +
1164 p->buf[delayB - 2] * p->coeffsB[filter][2] +
1165 p->buf[delayB - 3] * p->coeffsB[filter][3] +
1166 p->buf[delayB - 4] * p->coeffsB[filter][4];
1168 p->lastA[filter] = decoded + ((predictionA + (predictionB >> 1)) >> 10);
1169 p->filterA[filter] = p->lastA[filter] + ((p->filterA[filter] * 31) >> 5);
1171 sign = APESIGN(decoded);
1172 p->coeffsA[filter][0] += p->buf[adaptA ] * sign;
1173 p->coeffsA[filter][1] += p->buf[adaptA - 1] * sign;
1174 p->coeffsA[filter][2] += p->buf[adaptA - 2] * sign;
1175 p->coeffsA[filter][3] += p->buf[adaptA - 3] * sign;
1176 p->coeffsB[filter][0] += p->buf[adaptB ] * sign;
1177 p->coeffsB[filter][1] += p->buf[adaptB - 1] * sign;
1178 p->coeffsB[filter][2] += p->buf[adaptB - 2] * sign;
1179 p->coeffsB[filter][3] += p->buf[adaptB - 3] * sign;
1180 p->coeffsB[filter][4] += p->buf[adaptB - 4] * sign;
1182 return p->filterA[filter];
1185 static void predictor_decode_stereo_3950(APEContext *ctx, int count)
1187 APEPredictor *p = &ctx->predictor;
1188 int32_t *decoded0 = ctx->decoded[0];
1189 int32_t *decoded1 = ctx->decoded[1];
1191 ape_apply_filters(ctx, ctx->decoded[0], ctx->decoded[1], count);
1195 *decoded0 = predictor_update_filter(p, *decoded0, 0, YDELAYA, YDELAYB,
1196 YADAPTCOEFFSA, YADAPTCOEFFSB);
1198 *decoded1 = predictor_update_filter(p, *decoded1, 1, XDELAYA, XDELAYB,
1199 XADAPTCOEFFSA, XADAPTCOEFFSB);
1205 /* Have we filled the history buffer? */
1206 if (p->buf == p->historybuffer + HISTORY_SIZE) {
1207 memmove(p->historybuffer, p->buf,
1208 PREDICTOR_SIZE * sizeof(*p->historybuffer));
1209 p->buf = p->historybuffer;
1214 static void predictor_decode_mono_3950(APEContext *ctx, int count)
1216 APEPredictor *p = &ctx->predictor;
1217 int32_t *decoded0 = ctx->decoded[0];
1218 int32_t predictionA, currentA, A, sign;
1220 ape_apply_filters(ctx, ctx->decoded[0], NULL, count);
1222 currentA = p->lastA[0];
1227 p->buf[YDELAYA] = currentA;
1228 p->buf[YDELAYA - 1] = p->buf[YDELAYA] - p->buf[YDELAYA - 1];
1230 predictionA = p->buf[YDELAYA ] * p->coeffsA[0][0] +
1231 p->buf[YDELAYA - 1] * p->coeffsA[0][1] +
1232 p->buf[YDELAYA - 2] * p->coeffsA[0][2] +
1233 p->buf[YDELAYA - 3] * p->coeffsA[0][3];
1235 currentA = A + (predictionA >> 10);
1237 p->buf[YADAPTCOEFFSA] = APESIGN(p->buf[YDELAYA ]);
1238 p->buf[YADAPTCOEFFSA - 1] = APESIGN(p->buf[YDELAYA - 1]);
1241 p->coeffsA[0][0] += p->buf[YADAPTCOEFFSA ] * sign;
1242 p->coeffsA[0][1] += p->buf[YADAPTCOEFFSA - 1] * sign;
1243 p->coeffsA[0][2] += p->buf[YADAPTCOEFFSA - 2] * sign;
1244 p->coeffsA[0][3] += p->buf[YADAPTCOEFFSA - 3] * sign;
1248 /* Have we filled the history buffer? */
1249 if (p->buf == p->historybuffer + HISTORY_SIZE) {
1250 memmove(p->historybuffer, p->buf,
1251 PREDICTOR_SIZE * sizeof(*p->historybuffer));
1252 p->buf = p->historybuffer;
1255 p->filterA[0] = currentA + ((p->filterA[0] * 31) >> 5);
1256 *(decoded0++) = p->filterA[0];
1259 p->lastA[0] = currentA;
1262 static void do_init_filter(APEFilter *f, int16_t *buf, int order)
1265 f->historybuffer = buf + order;
1266 f->delay = f->historybuffer + order * 2;
1267 f->adaptcoeffs = f->historybuffer + order;
1269 memset(f->historybuffer, 0, (order * 2) * sizeof(*f->historybuffer));
1270 memset(f->coeffs, 0, order * sizeof(*f->coeffs));
1274 static void init_filter(APEContext *ctx, APEFilter *f, int16_t *buf, int order)
1276 do_init_filter(&f[0], buf, order);
1277 do_init_filter(&f[1], buf + order * 3 + HISTORY_SIZE, order);
1280 static void do_apply_filter(APEContext *ctx, int version, APEFilter *f,
1281 int32_t *data, int count, int order, int fracbits)
1287 /* round fixedpoint scalar product */
1288 res = ctx->adsp.scalarproduct_and_madd_int16(f->coeffs,
1290 f->adaptcoeffs - order,
1291 order, APESIGN(*data));
1292 res = (res + (1 << (fracbits - 1))) >> fracbits;
1296 /* Update the output history */
1297 *f->delay++ = av_clip_int16(res);
1299 if (version < 3980) {
1300 /* Version ??? to < 3.98 files (untested) */
1301 f->adaptcoeffs[0] = (res == 0) ? 0 : ((res >> 28) & 8) - 4;
1302 f->adaptcoeffs[-4] >>= 1;
1303 f->adaptcoeffs[-8] >>= 1;
1305 /* Version 3.98 and later files */
1307 /* Update the adaption coefficients */
1308 absres = FFABS(res);
1310 *f->adaptcoeffs = ((res & (-1<<31)) ^ (-1<<30)) >>
1311 (25 + (absres <= f->avg*3) + (absres <= f->avg*4/3));
1313 *f->adaptcoeffs = 0;
1315 f->avg += (absres - f->avg) / 16;
1317 f->adaptcoeffs[-1] >>= 1;
1318 f->adaptcoeffs[-2] >>= 1;
1319 f->adaptcoeffs[-8] >>= 1;
1324 /* Have we filled the history buffer? */
1325 if (f->delay == f->historybuffer + HISTORY_SIZE + (order * 2)) {
1326 memmove(f->historybuffer, f->delay - (order * 2),
1327 (order * 2) * sizeof(*f->historybuffer));
1328 f->delay = f->historybuffer + order * 2;
1329 f->adaptcoeffs = f->historybuffer + order;
1334 static void apply_filter(APEContext *ctx, APEFilter *f,
1335 int32_t *data0, int32_t *data1,
1336 int count, int order, int fracbits)
1338 do_apply_filter(ctx, ctx->fileversion, &f[0], data0, count, order, fracbits);
1340 do_apply_filter(ctx, ctx->fileversion, &f[1], data1, count, order, fracbits);
1343 static void ape_apply_filters(APEContext *ctx, int32_t *decoded0,
1344 int32_t *decoded1, int count)
1348 for (i = 0; i < APE_FILTER_LEVELS; i++) {
1349 if (!ape_filter_orders[ctx->fset][i])
1351 apply_filter(ctx, ctx->filters[i], decoded0, decoded1, count,
1352 ape_filter_orders[ctx->fset][i],
1353 ape_filter_fracbits[ctx->fset][i]);
1357 static int init_frame_decoder(APEContext *ctx)
1360 if ((ret = init_entropy_decoder(ctx)) < 0)
1362 init_predictor_decoder(ctx);
1364 for (i = 0; i < APE_FILTER_LEVELS; i++) {
1365 if (!ape_filter_orders[ctx->fset][i])
1367 init_filter(ctx, ctx->filters[i], ctx->filterbuf[i],
1368 ape_filter_orders[ctx->fset][i]);
1373 static void ape_unpack_mono(APEContext *ctx, int count)
1375 if (ctx->frameflags & APE_FRAMECODE_STEREO_SILENCE) {
1376 /* We are pure silence, so we're done. */
1377 av_log(ctx->avctx, AV_LOG_DEBUG, "pure silence mono\n");
1381 ctx->entropy_decode_mono(ctx, count);
1383 /* Now apply the predictor decoding */
1384 ctx->predictor_decode_mono(ctx, count);
1386 /* Pseudo-stereo - just copy left channel to right channel */
1387 if (ctx->channels == 2) {
1388 memcpy(ctx->decoded[1], ctx->decoded[0], count * sizeof(*ctx->decoded[1]));
1392 static void ape_unpack_stereo(APEContext *ctx, int count)
1394 int32_t left, right;
1395 int32_t *decoded0 = ctx->decoded[0];
1396 int32_t *decoded1 = ctx->decoded[1];
1398 if (ctx->frameflags & APE_FRAMECODE_STEREO_SILENCE) {
1399 /* We are pure silence, so we're done. */
1400 av_log(ctx->avctx, AV_LOG_DEBUG, "pure silence stereo\n");
1404 ctx->entropy_decode_stereo(ctx, count);
1406 /* Now apply the predictor decoding */
1407 ctx->predictor_decode_stereo(ctx, count);
1409 /* Decorrelate and scale to output depth */
1411 left = *decoded1 - (*decoded0 / 2);
1412 right = left + *decoded0;
1414 *(decoded0++) = left;
1415 *(decoded1++) = right;
1419 static int ape_decode_frame(AVCodecContext *avctx, void *data,
1420 int *got_frame_ptr, AVPacket *avpkt)
1422 AVFrame *frame = data;
1423 const uint8_t *buf = avpkt->data;
1424 APEContext *s = avctx->priv_data;
1431 /* this should never be negative, but bad things will happen if it is, so
1432 check it just to make sure. */
1433 av_assert0(s->samples >= 0);
1436 uint32_t nblocks, offset;
1443 if (avpkt->size < 8) {
1444 av_log(avctx, AV_LOG_ERROR, "Packet is too small\n");
1445 return AVERROR_INVALIDDATA;
1447 buf_size = avpkt->size & ~3;
1448 if (buf_size != avpkt->size) {
1449 av_log(avctx, AV_LOG_WARNING, "packet size is not a multiple of 4. "
1450 "extra bytes at the end will be skipped.\n");
1452 if (s->fileversion < 3950) // previous versions overread two bytes
1454 av_fast_malloc(&s->data, &s->data_size, buf_size);
1456 return AVERROR(ENOMEM);
1457 s->dsp.bswap_buf((uint32_t*)s->data, (const uint32_t*)buf, buf_size >> 2);
1458 memset(s->data + (buf_size & ~3), 0, buf_size & 3);
1460 s->data_end = s->data + buf_size;
1462 nblocks = bytestream_get_be32(&s->ptr);
1463 offset = bytestream_get_be32(&s->ptr);
1464 if (s->fileversion >= 3900) {
1466 av_log(avctx, AV_LOG_ERROR, "Incorrect offset passed\n");
1468 return AVERROR_INVALIDDATA;
1470 if (s->data_end - s->ptr < offset) {
1471 av_log(avctx, AV_LOG_ERROR, "Packet is too small\n");
1472 return AVERROR_INVALIDDATA;
1476 init_get_bits(&s->gb, s->ptr, (s->data_end - s->ptr) * 8);
1477 if (s->fileversion > 3800)
1478 skip_bits_long(&s->gb, offset * 8);
1480 skip_bits_long(&s->gb, offset);
1483 if (!nblocks || nblocks > INT_MAX) {
1484 av_log(avctx, AV_LOG_ERROR, "Invalid sample count: %"PRIu32".\n",
1486 return AVERROR_INVALIDDATA;
1488 s->samples = nblocks;
1490 /* Initialize the frame decoder */
1491 if (init_frame_decoder(s) < 0) {
1492 av_log(avctx, AV_LOG_ERROR, "Error reading frame header\n");
1493 return AVERROR_INVALIDDATA;
1503 blockstodecode = FFMIN(s->blocks_per_loop, s->samples);
1504 // for old files coefficients were not interleaved,
1505 // so we need to decode all of them at once
1506 if (s->fileversion < 3930)
1507 blockstodecode = s->samples;
1509 /* reallocate decoded sample buffer if needed */
1510 av_fast_malloc(&s->decoded_buffer, &s->decoded_size,
1511 2 * FFALIGN(blockstodecode, 8) * sizeof(*s->decoded_buffer));
1512 if (!s->decoded_buffer)
1513 return AVERROR(ENOMEM);
1514 memset(s->decoded_buffer, 0, s->decoded_size);
1515 s->decoded[0] = s->decoded_buffer;
1516 s->decoded[1] = s->decoded_buffer + FFALIGN(blockstodecode, 8);
1518 /* get output buffer */
1519 frame->nb_samples = blockstodecode;
1520 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) {
1521 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
1527 if ((s->channels == 1) || (s->frameflags & APE_FRAMECODE_PSEUDO_STEREO))
1528 ape_unpack_mono(s, blockstodecode);
1530 ape_unpack_stereo(s, blockstodecode);
1535 av_log(avctx, AV_LOG_ERROR, "Error decoding frame\n");
1536 return AVERROR_INVALIDDATA;
1541 for (ch = 0; ch < s->channels; ch++) {
1542 sample8 = (uint8_t *)frame->data[ch];
1543 for (i = 0; i < blockstodecode; i++)
1544 *sample8++ = (s->decoded[ch][i] + 0x80) & 0xff;
1548 for (ch = 0; ch < s->channels; ch++) {
1549 sample16 = (int16_t *)frame->data[ch];
1550 for (i = 0; i < blockstodecode; i++)
1551 *sample16++ = s->decoded[ch][i];
1555 for (ch = 0; ch < s->channels; ch++) {
1556 sample24 = (int32_t *)frame->data[ch];
1557 for (i = 0; i < blockstodecode; i++)
1558 *sample24++ = s->decoded[ch][i] << 8;
1563 s->samples -= blockstodecode;
1567 return (s->samples == 0) ? avpkt->size : 0;
1570 static void ape_flush(AVCodecContext *avctx)
1572 APEContext *s = avctx->priv_data;
1576 #define OFFSET(x) offsetof(APEContext, x)
1577 #define PAR (AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_AUDIO_PARAM)
1578 static const AVOption options[] = {
1579 { "max_samples", "maximum number of samples decoded per call", OFFSET(blocks_per_loop), AV_OPT_TYPE_INT, { .i64 = 4608 }, 1, INT_MAX, PAR, "max_samples" },
1580 { "all", "no maximum. decode all samples for each packet at once", 0, AV_OPT_TYPE_CONST, { .i64 = INT_MAX }, INT_MIN, INT_MAX, PAR, "max_samples" },
1584 static const AVClass ape_decoder_class = {
1585 .class_name = "APE decoder",
1586 .item_name = av_default_item_name,
1588 .version = LIBAVUTIL_VERSION_INT,
1591 AVCodec ff_ape_decoder = {
1593 .long_name = NULL_IF_CONFIG_SMALL("Monkey's Audio"),
1594 .type = AVMEDIA_TYPE_AUDIO,
1595 .id = AV_CODEC_ID_APE,
1596 .priv_data_size = sizeof(APEContext),
1597 .init = ape_decode_init,
1598 .close = ape_decode_close,
1599 .decode = ape_decode_frame,
1600 .capabilities = CODEC_CAP_SUBFRAMES | CODEC_CAP_DELAY | CODEC_CAP_DR1,
1602 .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_U8P,
1605 AV_SAMPLE_FMT_NONE },
1606 .priv_class = &ape_decoder_class,