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 FFmpeg.
8 * FFmpeg 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 * FFmpeg 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 FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23 #include "libavutil/avassert.h"
24 #include "libavutil/channel_layout.h"
25 #include "libavutil/opt.h"
28 #include "bytestream.h"
35 * Monkey's Audio lossless audio decoder
38 #define MAX_CHANNELS 2
39 #define MAX_BYTESPERSAMPLE 3
41 #define APE_FRAMECODE_MONO_SILENCE 1
42 #define APE_FRAMECODE_STEREO_SILENCE 3
43 #define APE_FRAMECODE_PSEUDO_STEREO 4
45 #define HISTORY_SIZE 512
46 #define PREDICTOR_ORDER 8
47 /** Total size of all predictor histories */
48 #define PREDICTOR_SIZE 50
50 #define YDELAYA (18 + PREDICTOR_ORDER*4)
51 #define YDELAYB (18 + PREDICTOR_ORDER*3)
52 #define XDELAYA (18 + PREDICTOR_ORDER*2)
53 #define XDELAYB (18 + PREDICTOR_ORDER)
55 #define YADAPTCOEFFSA 18
56 #define XADAPTCOEFFSA 14
57 #define YADAPTCOEFFSB 10
58 #define XADAPTCOEFFSB 5
61 * Possible compression levels
64 enum APECompressionLevel {
65 COMPRESSION_LEVEL_FAST = 1000,
66 COMPRESSION_LEVEL_NORMAL = 2000,
67 COMPRESSION_LEVEL_HIGH = 3000,
68 COMPRESSION_LEVEL_EXTRA_HIGH = 4000,
69 COMPRESSION_LEVEL_INSANE = 5000
73 #define APE_FILTER_LEVELS 3
75 /** Filter orders depending on compression level */
76 static const uint16_t ape_filter_orders[5][APE_FILTER_LEVELS] = {
84 /** Filter fraction bits depending on compression level */
85 static const uint8_t ape_filter_fracbits[5][APE_FILTER_LEVELS] = {
94 /** Filters applied to the decoded data */
95 typedef struct APEFilter {
96 int16_t *coeffs; ///< actual coefficients used in filtering
97 int16_t *adaptcoeffs; ///< adaptive filter coefficients used for correcting of actual filter coefficients
98 int16_t *historybuffer; ///< filter memory
99 int16_t *delay; ///< filtered values
104 typedef struct APERice {
109 typedef struct APERangecoder {
110 uint32_t low; ///< low end of interval
111 uint32_t range; ///< length of interval
112 uint32_t help; ///< bytes_to_follow resp. intermediate value
113 unsigned int buffer; ///< buffer for input/output
116 /** Filter histories */
117 typedef struct APEPredictor {
125 int32_t coeffsA[2][4]; ///< adaption coefficients
126 int32_t coeffsB[2][5]; ///< adaption coefficients
127 int32_t historybuffer[HISTORY_SIZE + PREDICTOR_SIZE];
129 unsigned int sample_pos;
132 /** Decoder context */
133 typedef struct APEContext {
134 AVClass *class; ///< class for AVOptions
135 AVCodecContext *avctx;
138 int samples; ///< samples left to decode in current frame
141 int fileversion; ///< codec version, very important in decoding process
142 int compression_level; ///< compression levels
143 int fset; ///< which filter set to use (calculated from compression level)
144 int flags; ///< global decoder flags
146 uint32_t CRC; ///< frame CRC
147 int frameflags; ///< frame flags
148 APEPredictor predictor; ///< predictor used for final reconstruction
150 int32_t *decoded_buffer;
152 int32_t *decoded[MAX_CHANNELS]; ///< decoded data for each channel
153 int blocks_per_loop; ///< maximum number of samples to decode for each call
155 int16_t* filterbuf[APE_FILTER_LEVELS]; ///< filter memory
157 APERangecoder rc; ///< rangecoder used to decode actual values
158 APERice riceX; ///< rice code parameters for the second channel
159 APERice riceY; ///< rice code parameters for the first channel
160 APEFilter filters[APE_FILTER_LEVELS][2]; ///< filters used for reconstruction
163 uint8_t *data; ///< current frame data
164 uint8_t *data_end; ///< frame data end
165 int data_size; ///< frame data allocated size
166 const uint8_t *ptr; ///< current position in frame data
170 void (*entropy_decode_mono)(struct APEContext *ctx, int blockstodecode);
171 void (*entropy_decode_stereo)(struct APEContext *ctx, int blockstodecode);
172 void (*predictor_decode_mono)(struct APEContext *ctx, int count);
173 void (*predictor_decode_stereo)(struct APEContext *ctx, int count);
176 static void ape_apply_filters(APEContext *ctx, int32_t *decoded0,
177 int32_t *decoded1, int count);
179 static void entropy_decode_mono_0000(APEContext *ctx, int blockstodecode);
180 static void entropy_decode_stereo_0000(APEContext *ctx, int blockstodecode);
181 static void entropy_decode_mono_3860(APEContext *ctx, int blockstodecode);
182 static void entropy_decode_stereo_3860(APEContext *ctx, int blockstodecode);
183 static void entropy_decode_mono_3900(APEContext *ctx, int blockstodecode);
184 static void entropy_decode_stereo_3900(APEContext *ctx, int blockstodecode);
185 static void entropy_decode_stereo_3930(APEContext *ctx, int blockstodecode);
186 static void entropy_decode_mono_3990(APEContext *ctx, int blockstodecode);
187 static void entropy_decode_stereo_3990(APEContext *ctx, int blockstodecode);
189 static void predictor_decode_mono_3800(APEContext *ctx, int count);
190 static void predictor_decode_stereo_3800(APEContext *ctx, int count);
191 static void predictor_decode_mono_3930(APEContext *ctx, int count);
192 static void predictor_decode_stereo_3930(APEContext *ctx, int count);
193 static void predictor_decode_mono_3950(APEContext *ctx, int count);
194 static void predictor_decode_stereo_3950(APEContext *ctx, int count);
198 static av_cold int ape_decode_close(AVCodecContext *avctx)
200 APEContext *s = avctx->priv_data;
203 for (i = 0; i < APE_FILTER_LEVELS; i++)
204 av_freep(&s->filterbuf[i]);
206 av_freep(&s->decoded_buffer);
208 s->decoded_size = s->data_size = 0;
213 static av_cold int ape_decode_init(AVCodecContext *avctx)
215 APEContext *s = avctx->priv_data;
218 if (avctx->extradata_size != 6) {
219 av_log(avctx, AV_LOG_ERROR, "Incorrect extradata\n");
220 return AVERROR(EINVAL);
222 if (avctx->channels > 2) {
223 av_log(avctx, AV_LOG_ERROR, "Only mono and stereo is supported\n");
224 return AVERROR(EINVAL);
226 s->bps = avctx->bits_per_coded_sample;
229 avctx->sample_fmt = AV_SAMPLE_FMT_U8P;
232 avctx->sample_fmt = AV_SAMPLE_FMT_S16P;
235 avctx->sample_fmt = AV_SAMPLE_FMT_S32P;
238 avpriv_request_sample(avctx,
239 "%d bits per coded sample", s->bps);
240 return AVERROR_PATCHWELCOME;
243 s->channels = avctx->channels;
244 s->fileversion = AV_RL16(avctx->extradata);
245 s->compression_level = AV_RL16(avctx->extradata + 2);
246 s->flags = AV_RL16(avctx->extradata + 4);
248 av_log(avctx, AV_LOG_DEBUG, "Compression Level: %d - Flags: %d\n",
249 s->compression_level, s->flags);
250 if (s->compression_level % 1000 || s->compression_level > COMPRESSION_LEVEL_INSANE ||
251 !s->compression_level ||
252 (s->fileversion < 3930 && s->compression_level == COMPRESSION_LEVEL_INSANE)) {
253 av_log(avctx, AV_LOG_ERROR, "Incorrect compression level %d\n",
254 s->compression_level);
255 return AVERROR_INVALIDDATA;
257 s->fset = s->compression_level / 1000 - 1;
258 for (i = 0; i < APE_FILTER_LEVELS; i++) {
259 if (!ape_filter_orders[s->fset][i])
261 FF_ALLOC_OR_GOTO(avctx, s->filterbuf[i],
262 (ape_filter_orders[s->fset][i] * 3 + HISTORY_SIZE) * 4,
266 if (s->fileversion < 3860) {
267 s->entropy_decode_mono = entropy_decode_mono_0000;
268 s->entropy_decode_stereo = entropy_decode_stereo_0000;
269 } else if (s->fileversion < 3900) {
270 s->entropy_decode_mono = entropy_decode_mono_3860;
271 s->entropy_decode_stereo = entropy_decode_stereo_3860;
272 } else if (s->fileversion < 3930) {
273 s->entropy_decode_mono = entropy_decode_mono_3900;
274 s->entropy_decode_stereo = entropy_decode_stereo_3900;
275 } else if (s->fileversion < 3990) {
276 s->entropy_decode_mono = entropy_decode_mono_3900;
277 s->entropy_decode_stereo = entropy_decode_stereo_3930;
279 s->entropy_decode_mono = entropy_decode_mono_3990;
280 s->entropy_decode_stereo = entropy_decode_stereo_3990;
283 if (s->fileversion < 3930) {
284 s->predictor_decode_mono = predictor_decode_mono_3800;
285 s->predictor_decode_stereo = predictor_decode_stereo_3800;
286 } else if (s->fileversion < 3950) {
287 s->predictor_decode_mono = predictor_decode_mono_3930;
288 s->predictor_decode_stereo = predictor_decode_stereo_3930;
290 s->predictor_decode_mono = predictor_decode_mono_3950;
291 s->predictor_decode_stereo = predictor_decode_stereo_3950;
294 ff_dsputil_init(&s->dsp, avctx);
295 avctx->channel_layout = (avctx->channels==2) ? AV_CH_LAYOUT_STEREO : AV_CH_LAYOUT_MONO;
299 ape_decode_close(avctx);
300 return AVERROR(ENOMEM);
304 * @name APE range decoding functions
309 #define TOP_VALUE ((unsigned int)1 << (CODE_BITS-1))
310 #define SHIFT_BITS (CODE_BITS - 9)
311 #define EXTRA_BITS ((CODE_BITS-2) % 8 + 1)
312 #define BOTTOM_VALUE (TOP_VALUE >> 8)
314 /** Start the decoder */
315 static inline void range_start_decoding(APEContext *ctx)
317 ctx->rc.buffer = bytestream_get_byte(&ctx->ptr);
318 ctx->rc.low = ctx->rc.buffer >> (8 - EXTRA_BITS);
319 ctx->rc.range = (uint32_t) 1 << EXTRA_BITS;
322 /** Perform normalization */
323 static inline void range_dec_normalize(APEContext *ctx)
325 while (ctx->rc.range <= BOTTOM_VALUE) {
326 ctx->rc.buffer <<= 8;
327 if(ctx->ptr < ctx->data_end) {
328 ctx->rc.buffer += *ctx->ptr;
333 ctx->rc.low = (ctx->rc.low << 8) | ((ctx->rc.buffer >> 1) & 0xFF);
339 * Calculate culmulative frequency for next symbol. Does NO update!
340 * @param ctx decoder context
341 * @param tot_f is the total frequency or (code_value)1<<shift
342 * @return the culmulative frequency
344 static inline int range_decode_culfreq(APEContext *ctx, int tot_f)
346 range_dec_normalize(ctx);
347 ctx->rc.help = ctx->rc.range / tot_f;
348 return ctx->rc.low / ctx->rc.help;
352 * Decode value with given size in bits
353 * @param ctx decoder context
354 * @param shift number of bits to decode
356 static inline int range_decode_culshift(APEContext *ctx, int shift)
358 range_dec_normalize(ctx);
359 ctx->rc.help = ctx->rc.range >> shift;
360 return ctx->rc.low / ctx->rc.help;
365 * Update decoding state
366 * @param ctx decoder context
367 * @param sy_f the interval length (frequency of the symbol)
368 * @param lt_f the lower end (frequency sum of < symbols)
370 static inline void range_decode_update(APEContext *ctx, int sy_f, int lt_f)
372 ctx->rc.low -= ctx->rc.help * lt_f;
373 ctx->rc.range = ctx->rc.help * sy_f;
376 /** Decode n bits (n <= 16) without modelling */
377 static inline int range_decode_bits(APEContext *ctx, int n)
379 int sym = range_decode_culshift(ctx, n);
380 range_decode_update(ctx, 1, sym);
385 #define MODEL_ELEMENTS 64
388 * Fixed probabilities for symbols in Monkey Audio version 3.97
390 static const uint16_t counts_3970[22] = {
391 0, 14824, 28224, 39348, 47855, 53994, 58171, 60926,
392 62682, 63786, 64463, 64878, 65126, 65276, 65365, 65419,
393 65450, 65469, 65480, 65487, 65491, 65493,
397 * Probability ranges for symbols in Monkey Audio version 3.97
399 static const uint16_t counts_diff_3970[21] = {
400 14824, 13400, 11124, 8507, 6139, 4177, 2755, 1756,
401 1104, 677, 415, 248, 150, 89, 54, 31,
406 * Fixed probabilities for symbols in Monkey Audio version 3.98
408 static const uint16_t counts_3980[22] = {
409 0, 19578, 36160, 48417, 56323, 60899, 63265, 64435,
410 64971, 65232, 65351, 65416, 65447, 65466, 65476, 65482,
411 65485, 65488, 65490, 65491, 65492, 65493,
415 * Probability ranges for symbols in Monkey Audio version 3.98
417 static const uint16_t counts_diff_3980[21] = {
418 19578, 16582, 12257, 7906, 4576, 2366, 1170, 536,
419 261, 119, 65, 31, 19, 10, 6, 3,
425 * @param ctx decoder context
426 * @param counts probability range start position
427 * @param counts_diff probability range widths
429 static inline int range_get_symbol(APEContext *ctx,
430 const uint16_t counts[],
431 const uint16_t counts_diff[])
435 cf = range_decode_culshift(ctx, 16);
438 symbol= cf - 65535 + 63;
439 range_decode_update(ctx, 1, cf);
444 /* figure out the symbol inefficiently; a binary search would be much better */
445 for (symbol = 0; counts[symbol + 1] <= cf; symbol++);
447 range_decode_update(ctx, counts_diff[symbol], counts[symbol]);
451 /** @} */ // group rangecoder
453 static inline void update_rice(APERice *rice, unsigned int x)
455 int lim = rice->k ? (1 << (rice->k + 4)) : 0;
456 rice->ksum += ((x + 1) / 2) - ((rice->ksum + 16) >> 5);
458 if (rice->ksum < lim)
460 else if (rice->ksum >= (1 << (rice->k + 5)))
464 static inline int get_rice_ook(GetBitContext *gb, int k)
468 x = get_unary(gb, 1, get_bits_left(gb));
471 x = (x << k) | get_bits(gb, k);
476 static inline int ape_decode_value_3860(APEContext *ctx, GetBitContext *gb,
479 unsigned int x, overflow;
481 overflow = get_unary(gb, 1, get_bits_left(gb));
483 if (ctx->fileversion > 3880) {
484 while (overflow >= 16) {
492 else if(rice->k <= MIN_CACHE_BITS) {
493 x = (overflow << rice->k) + get_bits(gb, rice->k);
495 av_log(ctx->avctx, AV_LOG_ERROR, "Too many bits: %d\n", rice->k);
496 return AVERROR_INVALIDDATA;
498 rice->ksum += x - (rice->ksum + 8 >> 4);
499 if (rice->ksum < (rice->k ? 1 << (rice->k + 4) : 0))
501 else if (rice->ksum >= (1 << (rice->k + 5)) && rice->k < 24)
504 /* Convert to signed */
511 static inline int ape_decode_value_3900(APEContext *ctx, APERice *rice)
513 unsigned int x, overflow;
516 overflow = range_get_symbol(ctx, counts_3970, counts_diff_3970);
518 if (overflow == (MODEL_ELEMENTS - 1)) {
519 tmpk = range_decode_bits(ctx, 5);
522 tmpk = (rice->k < 1) ? 0 : rice->k - 1;
524 if (tmpk <= 16 || ctx->fileversion < 3910) {
526 av_log(ctx->avctx, AV_LOG_ERROR, "Too many bits: %d\n", tmpk);
527 return AVERROR_INVALIDDATA;
529 x = range_decode_bits(ctx, tmpk);
530 } else if (tmpk <= 32) {
531 x = range_decode_bits(ctx, 16);
532 x |= (range_decode_bits(ctx, tmpk - 16) << 16);
534 av_log(ctx->avctx, AV_LOG_ERROR, "Too many bits: %d\n", tmpk);
535 return AVERROR_INVALIDDATA;
537 x += overflow << tmpk;
539 update_rice(rice, x);
541 /* Convert to signed */
548 static inline int ape_decode_value_3990(APEContext *ctx, APERice *rice)
550 unsigned int x, overflow;
553 pivot = rice->ksum >> 5;
557 overflow = range_get_symbol(ctx, counts_3980, counts_diff_3980);
559 if (overflow == (MODEL_ELEMENTS - 1)) {
560 overflow = range_decode_bits(ctx, 16) << 16;
561 overflow |= range_decode_bits(ctx, 16);
564 if (pivot < 0x10000) {
565 base = range_decode_culfreq(ctx, pivot);
566 range_decode_update(ctx, 1, base);
568 int base_hi = pivot, base_lo;
571 while (base_hi & ~0xFFFF) {
575 base_hi = range_decode_culfreq(ctx, base_hi + 1);
576 range_decode_update(ctx, 1, base_hi);
577 base_lo = range_decode_culfreq(ctx, 1 << bbits);
578 range_decode_update(ctx, 1, base_lo);
580 base = (base_hi << bbits) + base_lo;
583 x = base + overflow * pivot;
585 update_rice(rice, x);
587 /* Convert to signed */
594 static void decode_array_0000(APEContext *ctx, GetBitContext *gb,
595 int32_t *out, APERice *rice, int blockstodecode)
598 int ksummax, ksummin;
601 for (i = 0; i < 5; i++) {
602 out[i] = get_rice_ook(&ctx->gb, 10);
603 rice->ksum += out[i];
605 rice->k = av_log2(rice->ksum / 10) + 1;
606 for (; i < 64; i++) {
607 out[i] = get_rice_ook(&ctx->gb, rice->k);
608 rice->ksum += out[i];
609 rice->k = av_log2(rice->ksum / ((i + 1) * 2)) + 1;
611 ksummax = 1 << rice->k + 7;
612 ksummin = rice->k ? (1 << rice->k + 6) : 0;
613 for (; i < blockstodecode; i++) {
614 out[i] = get_rice_ook(&ctx->gb, rice->k);
615 rice->ksum += out[i] - out[i - 64];
616 while (rice->ksum < ksummin) {
618 ksummin = rice->k ? ksummin >> 1 : 0;
621 while (rice->ksum >= ksummax) {
626 ksummin = ksummin ? ksummin << 1 : 128;
630 for (i = 0; i < blockstodecode; i++) {
632 out[i] = (out[i] >> 1) + 1;
634 out[i] = -(out[i] >> 1);
638 static void entropy_decode_mono_0000(APEContext *ctx, int blockstodecode)
640 decode_array_0000(ctx, &ctx->gb, ctx->decoded[0], &ctx->riceY,
644 static void entropy_decode_stereo_0000(APEContext *ctx, int blockstodecode)
646 decode_array_0000(ctx, &ctx->gb, ctx->decoded[0], &ctx->riceY,
648 decode_array_0000(ctx, &ctx->gb, ctx->decoded[1], &ctx->riceX,
652 static void entropy_decode_mono_3860(APEContext *ctx, int blockstodecode)
654 int32_t *decoded0 = ctx->decoded[0];
656 while (blockstodecode--)
657 *decoded0++ = ape_decode_value_3860(ctx, &ctx->gb, &ctx->riceY);
660 static void entropy_decode_stereo_3860(APEContext *ctx, int blockstodecode)
662 int32_t *decoded0 = ctx->decoded[0];
663 int32_t *decoded1 = ctx->decoded[1];
664 int blocks = blockstodecode;
666 while (blockstodecode--)
667 *decoded0++ = ape_decode_value_3860(ctx, &ctx->gb, &ctx->riceY);
669 *decoded1++ = ape_decode_value_3860(ctx, &ctx->gb, &ctx->riceX);
672 static void entropy_decode_mono_3900(APEContext *ctx, int blockstodecode)
674 int32_t *decoded0 = ctx->decoded[0];
676 while (blockstodecode--)
677 *decoded0++ = ape_decode_value_3900(ctx, &ctx->riceY);
680 static void entropy_decode_stereo_3900(APEContext *ctx, int blockstodecode)
682 int32_t *decoded0 = ctx->decoded[0];
683 int32_t *decoded1 = ctx->decoded[1];
684 int blocks = blockstodecode;
686 while (blockstodecode--)
687 *decoded0++ = ape_decode_value_3900(ctx, &ctx->riceY);
688 range_dec_normalize(ctx);
689 // because of some implementation peculiarities we need to backpedal here
691 range_start_decoding(ctx);
693 *decoded1++ = ape_decode_value_3900(ctx, &ctx->riceX);
696 static void entropy_decode_stereo_3930(APEContext *ctx, int blockstodecode)
698 int32_t *decoded0 = ctx->decoded[0];
699 int32_t *decoded1 = ctx->decoded[1];
701 while (blockstodecode--) {
702 *decoded0++ = ape_decode_value_3900(ctx, &ctx->riceY);
703 *decoded1++ = ape_decode_value_3900(ctx, &ctx->riceX);
707 static void entropy_decode_mono_3990(APEContext *ctx, int blockstodecode)
709 int32_t *decoded0 = ctx->decoded[0];
711 while (blockstodecode--)
712 *decoded0++ = ape_decode_value_3990(ctx, &ctx->riceY);
715 static void entropy_decode_stereo_3990(APEContext *ctx, int blockstodecode)
717 int32_t *decoded0 = ctx->decoded[0];
718 int32_t *decoded1 = ctx->decoded[1];
720 while (blockstodecode--) {
721 *decoded0++ = ape_decode_value_3990(ctx, &ctx->riceY);
722 *decoded1++ = ape_decode_value_3990(ctx, &ctx->riceX);
726 static int init_entropy_decoder(APEContext *ctx)
729 if (ctx->fileversion >= 3900) {
730 if (ctx->data_end - ctx->ptr < 6)
731 return AVERROR_INVALIDDATA;
732 ctx->CRC = bytestream_get_be32(&ctx->ptr);
734 ctx->CRC = get_bits_long(&ctx->gb, 32);
737 /* Read the frame flags if they exist */
739 if ((ctx->fileversion > 3820) && (ctx->CRC & 0x80000000)) {
740 ctx->CRC &= ~0x80000000;
742 if (ctx->data_end - ctx->ptr < 6)
743 return AVERROR_INVALIDDATA;
744 ctx->frameflags = bytestream_get_be32(&ctx->ptr);
747 /* Initialize the rice structs */
749 ctx->riceX.ksum = (1 << ctx->riceX.k) * 16;
751 ctx->riceY.ksum = (1 << ctx->riceY.k) * 16;
753 if (ctx->fileversion >= 3900) {
754 /* The first 8 bits of input are ignored. */
757 range_start_decoding(ctx);
763 static const int32_t initial_coeffs_fast_3320[1] = {
767 static const int32_t initial_coeffs_a_3800[3] = {
771 static const int32_t initial_coeffs_b_3800[2] = {
775 static const int32_t initial_coeffs_3930[4] = {
779 static void init_predictor_decoder(APEContext *ctx)
781 APEPredictor *p = &ctx->predictor;
783 /* Zero the history buffers */
784 memset(p->historybuffer, 0, PREDICTOR_SIZE * sizeof(*p->historybuffer));
785 p->buf = p->historybuffer;
787 /* Initialize and zero the coefficients */
788 if (ctx->fileversion < 3930) {
789 if (ctx->compression_level == COMPRESSION_LEVEL_FAST) {
790 memcpy(p->coeffsA[0], initial_coeffs_fast_3320,
791 sizeof(initial_coeffs_fast_3320));
792 memcpy(p->coeffsA[1], initial_coeffs_fast_3320,
793 sizeof(initial_coeffs_fast_3320));
795 memcpy(p->coeffsA[0], initial_coeffs_a_3800,
796 sizeof(initial_coeffs_a_3800));
797 memcpy(p->coeffsA[1], initial_coeffs_a_3800,
798 sizeof(initial_coeffs_a_3800));
801 memcpy(p->coeffsA[0], initial_coeffs_3930, sizeof(initial_coeffs_3930));
802 memcpy(p->coeffsA[1], initial_coeffs_3930, sizeof(initial_coeffs_3930));
804 memset(p->coeffsB, 0, sizeof(p->coeffsB));
805 if (ctx->fileversion < 3930) {
806 memcpy(p->coeffsB[0], initial_coeffs_b_3800,
807 sizeof(initial_coeffs_b_3800));
808 memcpy(p->coeffsB[1], initial_coeffs_b_3800,
809 sizeof(initial_coeffs_b_3800));
812 p->filterA[0] = p->filterA[1] = 0;
813 p->filterB[0] = p->filterB[1] = 0;
814 p->lastA[0] = p->lastA[1] = 0;
819 /** Get inverse sign of integer (-1 for positive, 1 for negative and 0 for zero) */
820 static inline int APESIGN(int32_t x) {
821 return (x < 0) - (x > 0);
824 static av_always_inline int filter_fast_3320(APEPredictor *p,
825 const int decoded, const int filter,
830 p->buf[delayA] = p->lastA[filter];
831 if (p->sample_pos < 3) {
832 p->lastA[filter] = decoded;
833 p->filterA[filter] = decoded;
837 predictionA = p->buf[delayA] * 2 - p->buf[delayA - 1];
838 p->lastA[filter] = decoded + (predictionA * p->coeffsA[filter][0] >> 9);
840 if ((decoded ^ predictionA) > 0)
841 p->coeffsA[filter][0]++;
843 p->coeffsA[filter][0]--;
845 p->filterA[filter] += p->lastA[filter];
847 return p->filterA[filter];
850 static av_always_inline int filter_3800(APEPredictor *p,
851 const int decoded, const int filter,
852 const int delayA, const int delayB,
853 const int start, const int shift)
855 int32_t predictionA, predictionB, sign;
856 int32_t d0, d1, d2, d3, d4;
858 p->buf[delayA] = p->lastA[filter];
859 p->buf[delayB] = p->filterB[filter];
860 if (p->sample_pos < start) {
861 predictionA = decoded + p->filterA[filter];
862 p->lastA[filter] = decoded;
863 p->filterB[filter] = decoded;
864 p->filterA[filter] = predictionA;
868 d1 = (p->buf[delayA] - p->buf[delayA - 1]) << 1;
869 d0 = p->buf[delayA] + ((p->buf[delayA - 2] - p->buf[delayA - 1]) << 3);
870 d3 = p->buf[delayB] * 2 - p->buf[delayB - 1];
873 predictionA = d0 * p->coeffsA[filter][0] +
874 d1 * p->coeffsA[filter][1] +
875 d2 * p->coeffsA[filter][2];
877 sign = APESIGN(decoded);
878 p->coeffsA[filter][0] += (((d0 >> 30) & 2) - 1) * sign;
879 p->coeffsA[filter][1] += (((d1 >> 28) & 8) - 4) * sign;
880 p->coeffsA[filter][2] += (((d2 >> 28) & 8) - 4) * sign;
882 predictionB = d3 * p->coeffsB[filter][0] -
883 d4 * p->coeffsB[filter][1];
884 p->lastA[filter] = decoded + (predictionA >> 11);
885 sign = APESIGN(p->lastA[filter]);
886 p->coeffsB[filter][0] += (((d3 >> 29) & 4) - 2) * sign;
887 p->coeffsB[filter][1] -= (((d4 >> 30) & 2) - 1) * sign;
889 p->filterB[filter] = p->lastA[filter] + (predictionB >> shift);
890 p->filterA[filter] = p->filterB[filter] + ((p->filterA[filter] * 31) >> 5);
892 return p->filterA[filter];
895 static void long_filter_high_3800(int32_t *buffer, int order, int shift,
896 int32_t *coeffs, int32_t *delay, int length)
899 int32_t dotprod, sign;
901 memset(coeffs, 0, order * sizeof(*coeffs));
902 for (i = 0; i < order; i++)
903 delay[i] = buffer[i];
904 for (i = order; i < length; i++) {
906 sign = APESIGN(buffer[i]);
907 for (j = 0; j < order; j++) {
908 dotprod += delay[j] * coeffs[j];
909 coeffs[j] -= (((delay[j] >> 30) & 2) - 1) * sign;
911 buffer[i] -= dotprod >> shift;
912 for (j = 0; j < order - 1; j++)
913 delay[j] = delay[j + 1];
914 delay[order - 1] = buffer[i];
918 static void long_filter_ehigh_3830(int32_t *buffer, int length)
921 int32_t dotprod, sign;
922 int32_t coeffs[8], delay[8];
924 memset(coeffs, 0, sizeof(coeffs));
925 memset(delay, 0, sizeof(delay));
926 for (i = 0; i < length; i++) {
928 sign = APESIGN(buffer[i]);
929 for (j = 7; j >= 0; j--) {
930 dotprod += delay[j] * coeffs[j];
931 coeffs[j] -= (((delay[j] >> 30) & 2) - 1) * sign;
933 for (j = 7; j > 0; j--)
934 delay[j] = delay[j - 1];
935 delay[0] = buffer[i];
936 buffer[i] -= dotprod >> 9;
940 static void predictor_decode_stereo_3800(APEContext *ctx, int count)
942 APEPredictor *p = &ctx->predictor;
943 int32_t *decoded0 = ctx->decoded[0];
944 int32_t *decoded1 = ctx->decoded[1];
945 int32_t coeffs[256], delay[256];
946 int start = 4, shift = 10;
948 if (ctx->compression_level == COMPRESSION_LEVEL_HIGH) {
950 long_filter_high_3800(decoded0, 16, 9, coeffs, delay, count);
951 long_filter_high_3800(decoded1, 16, 9, coeffs, delay, count);
952 } else if (ctx->compression_level == COMPRESSION_LEVEL_EXTRA_HIGH) {
953 int order = 128, shift2 = 11;
955 if (ctx->fileversion >= 3830) {
959 long_filter_ehigh_3830(decoded0 + order, count - order);
960 long_filter_ehigh_3830(decoded1 + order, count - order);
963 long_filter_high_3800(decoded0, order, shift2, coeffs, delay, count);
964 long_filter_high_3800(decoded1, order, shift2, coeffs, delay, count);
968 int X = *decoded0, Y = *decoded1;
969 if (ctx->compression_level == COMPRESSION_LEVEL_FAST) {
970 *decoded0 = filter_fast_3320(p, Y, 0, YDELAYA);
972 *decoded1 = filter_fast_3320(p, X, 1, XDELAYA);
975 *decoded0 = filter_3800(p, Y, 0, YDELAYA, YDELAYB,
978 *decoded1 = filter_3800(p, X, 1, XDELAYA, XDELAYB,
987 /* Have we filled the history buffer? */
988 if (p->buf == p->historybuffer + HISTORY_SIZE) {
989 memmove(p->historybuffer, p->buf,
990 PREDICTOR_SIZE * sizeof(*p->historybuffer));
991 p->buf = p->historybuffer;
996 static void predictor_decode_mono_3800(APEContext *ctx, int count)
998 APEPredictor *p = &ctx->predictor;
999 int32_t *decoded0 = ctx->decoded[0];
1000 int32_t coeffs[256], delay[256];
1001 int start = 4, shift = 10;
1003 if (ctx->compression_level == COMPRESSION_LEVEL_HIGH) {
1005 long_filter_high_3800(decoded0, 16, 9, coeffs, delay, count);
1006 } else if (ctx->compression_level == COMPRESSION_LEVEL_EXTRA_HIGH) {
1007 int order = 128, shift2 = 11;
1009 if (ctx->fileversion >= 3830) {
1013 long_filter_ehigh_3830(decoded0 + order, count - order);
1016 long_filter_high_3800(decoded0, order, shift2, coeffs, delay, count);
1020 if (ctx->compression_level == COMPRESSION_LEVEL_FAST) {
1021 *decoded0 = filter_fast_3320(p, *decoded0, 0, YDELAYA);
1024 *decoded0 = filter_3800(p, *decoded0, 0, YDELAYA, YDELAYB,
1033 /* Have we filled the history buffer? */
1034 if (p->buf == p->historybuffer + HISTORY_SIZE) {
1035 memmove(p->historybuffer, p->buf,
1036 PREDICTOR_SIZE * sizeof(*p->historybuffer));
1037 p->buf = p->historybuffer;
1042 static av_always_inline int predictor_update_3930(APEPredictor *p,
1043 const int decoded, const int filter,
1046 int32_t predictionA, sign;
1047 int32_t d0, d1, d2, d3;
1049 p->buf[delayA] = p->lastA[filter];
1050 d0 = p->buf[delayA ];
1051 d1 = p->buf[delayA ] - p->buf[delayA - 1];
1052 d2 = p->buf[delayA - 1] - p->buf[delayA - 2];
1053 d3 = p->buf[delayA - 2] - p->buf[delayA - 3];
1055 predictionA = d0 * p->coeffsA[filter][0] +
1056 d1 * p->coeffsA[filter][1] +
1057 d2 * p->coeffsA[filter][2] +
1058 d3 * p->coeffsA[filter][3];
1060 p->lastA[filter] = decoded + (predictionA >> 9);
1061 p->filterA[filter] = p->lastA[filter] + ((p->filterA[filter] * 31) >> 5);
1063 sign = APESIGN(decoded);
1064 p->coeffsA[filter][0] += ((d0 < 0) * 2 - 1) * sign;
1065 p->coeffsA[filter][1] += ((d1 < 0) * 2 - 1) * sign;
1066 p->coeffsA[filter][2] += ((d2 < 0) * 2 - 1) * sign;
1067 p->coeffsA[filter][3] += ((d3 < 0) * 2 - 1) * sign;
1069 return p->filterA[filter];
1072 static void predictor_decode_stereo_3930(APEContext *ctx, int count)
1074 APEPredictor *p = &ctx->predictor;
1075 int32_t *decoded0 = ctx->decoded[0];
1076 int32_t *decoded1 = ctx->decoded[1];
1078 ape_apply_filters(ctx, ctx->decoded[0], ctx->decoded[1], count);
1082 int Y = *decoded1, X = *decoded0;
1083 *decoded0 = predictor_update_3930(p, Y, 0, YDELAYA);
1085 *decoded1 = predictor_update_3930(p, X, 1, XDELAYA);
1091 /* Have we filled the history buffer? */
1092 if (p->buf == p->historybuffer + HISTORY_SIZE) {
1093 memmove(p->historybuffer, p->buf,
1094 PREDICTOR_SIZE * sizeof(*p->historybuffer));
1095 p->buf = p->historybuffer;
1100 static void predictor_decode_mono_3930(APEContext *ctx, int count)
1102 APEPredictor *p = &ctx->predictor;
1103 int32_t *decoded0 = ctx->decoded[0];
1105 ape_apply_filters(ctx, ctx->decoded[0], NULL, count);
1108 *decoded0 = predictor_update_3930(p, *decoded0, 0, YDELAYA);
1113 /* Have we filled the history buffer? */
1114 if (p->buf == p->historybuffer + HISTORY_SIZE) {
1115 memmove(p->historybuffer, p->buf,
1116 PREDICTOR_SIZE * sizeof(*p->historybuffer));
1117 p->buf = p->historybuffer;
1122 static av_always_inline int predictor_update_filter(APEPredictor *p,
1123 const int decoded, const int filter,
1124 const int delayA, const int delayB,
1125 const int adaptA, const int adaptB)
1127 int32_t predictionA, predictionB, sign;
1129 p->buf[delayA] = p->lastA[filter];
1130 p->buf[adaptA] = APESIGN(p->buf[delayA]);
1131 p->buf[delayA - 1] = p->buf[delayA] - p->buf[delayA - 1];
1132 p->buf[adaptA - 1] = APESIGN(p->buf[delayA - 1]);
1134 predictionA = p->buf[delayA ] * p->coeffsA[filter][0] +
1135 p->buf[delayA - 1] * p->coeffsA[filter][1] +
1136 p->buf[delayA - 2] * p->coeffsA[filter][2] +
1137 p->buf[delayA - 3] * p->coeffsA[filter][3];
1139 /* Apply a scaled first-order filter compression */
1140 p->buf[delayB] = p->filterA[filter ^ 1] - ((p->filterB[filter] * 31) >> 5);
1141 p->buf[adaptB] = APESIGN(p->buf[delayB]);
1142 p->buf[delayB - 1] = p->buf[delayB] - p->buf[delayB - 1];
1143 p->buf[adaptB - 1] = APESIGN(p->buf[delayB - 1]);
1144 p->filterB[filter] = p->filterA[filter ^ 1];
1146 predictionB = p->buf[delayB ] * p->coeffsB[filter][0] +
1147 p->buf[delayB - 1] * p->coeffsB[filter][1] +
1148 p->buf[delayB - 2] * p->coeffsB[filter][2] +
1149 p->buf[delayB - 3] * p->coeffsB[filter][3] +
1150 p->buf[delayB - 4] * p->coeffsB[filter][4];
1152 p->lastA[filter] = decoded + ((predictionA + (predictionB >> 1)) >> 10);
1153 p->filterA[filter] = p->lastA[filter] + ((p->filterA[filter] * 31) >> 5);
1155 sign = APESIGN(decoded);
1156 p->coeffsA[filter][0] += p->buf[adaptA ] * sign;
1157 p->coeffsA[filter][1] += p->buf[adaptA - 1] * sign;
1158 p->coeffsA[filter][2] += p->buf[adaptA - 2] * sign;
1159 p->coeffsA[filter][3] += p->buf[adaptA - 3] * sign;
1160 p->coeffsB[filter][0] += p->buf[adaptB ] * sign;
1161 p->coeffsB[filter][1] += p->buf[adaptB - 1] * sign;
1162 p->coeffsB[filter][2] += p->buf[adaptB - 2] * sign;
1163 p->coeffsB[filter][3] += p->buf[adaptB - 3] * sign;
1164 p->coeffsB[filter][4] += p->buf[adaptB - 4] * sign;
1166 return p->filterA[filter];
1169 static void predictor_decode_stereo_3950(APEContext *ctx, int count)
1171 APEPredictor *p = &ctx->predictor;
1172 int32_t *decoded0 = ctx->decoded[0];
1173 int32_t *decoded1 = ctx->decoded[1];
1175 ape_apply_filters(ctx, ctx->decoded[0], ctx->decoded[1], count);
1179 *decoded0 = predictor_update_filter(p, *decoded0, 0, YDELAYA, YDELAYB,
1180 YADAPTCOEFFSA, YADAPTCOEFFSB);
1182 *decoded1 = predictor_update_filter(p, *decoded1, 1, XDELAYA, XDELAYB,
1183 XADAPTCOEFFSA, XADAPTCOEFFSB);
1189 /* Have we filled the history buffer? */
1190 if (p->buf == p->historybuffer + HISTORY_SIZE) {
1191 memmove(p->historybuffer, p->buf,
1192 PREDICTOR_SIZE * sizeof(*p->historybuffer));
1193 p->buf = p->historybuffer;
1198 static void predictor_decode_mono_3950(APEContext *ctx, int count)
1200 APEPredictor *p = &ctx->predictor;
1201 int32_t *decoded0 = ctx->decoded[0];
1202 int32_t predictionA, currentA, A, sign;
1204 ape_apply_filters(ctx, ctx->decoded[0], NULL, count);
1206 currentA = p->lastA[0];
1211 p->buf[YDELAYA] = currentA;
1212 p->buf[YDELAYA - 1] = p->buf[YDELAYA] - p->buf[YDELAYA - 1];
1214 predictionA = p->buf[YDELAYA ] * p->coeffsA[0][0] +
1215 p->buf[YDELAYA - 1] * p->coeffsA[0][1] +
1216 p->buf[YDELAYA - 2] * p->coeffsA[0][2] +
1217 p->buf[YDELAYA - 3] * p->coeffsA[0][3];
1219 currentA = A + (predictionA >> 10);
1221 p->buf[YADAPTCOEFFSA] = APESIGN(p->buf[YDELAYA ]);
1222 p->buf[YADAPTCOEFFSA - 1] = APESIGN(p->buf[YDELAYA - 1]);
1225 p->coeffsA[0][0] += p->buf[YADAPTCOEFFSA ] * sign;
1226 p->coeffsA[0][1] += p->buf[YADAPTCOEFFSA - 1] * sign;
1227 p->coeffsA[0][2] += p->buf[YADAPTCOEFFSA - 2] * sign;
1228 p->coeffsA[0][3] += p->buf[YADAPTCOEFFSA - 3] * sign;
1232 /* Have we filled the history buffer? */
1233 if (p->buf == p->historybuffer + HISTORY_SIZE) {
1234 memmove(p->historybuffer, p->buf,
1235 PREDICTOR_SIZE * sizeof(*p->historybuffer));
1236 p->buf = p->historybuffer;
1239 p->filterA[0] = currentA + ((p->filterA[0] * 31) >> 5);
1240 *(decoded0++) = p->filterA[0];
1243 p->lastA[0] = currentA;
1246 static void do_init_filter(APEFilter *f, int16_t *buf, int order)
1249 f->historybuffer = buf + order;
1250 f->delay = f->historybuffer + order * 2;
1251 f->adaptcoeffs = f->historybuffer + order;
1253 memset(f->historybuffer, 0, (order * 2) * sizeof(*f->historybuffer));
1254 memset(f->coeffs, 0, order * sizeof(*f->coeffs));
1258 static void init_filter(APEContext *ctx, APEFilter *f, int16_t *buf, int order)
1260 do_init_filter(&f[0], buf, order);
1261 do_init_filter(&f[1], buf + order * 3 + HISTORY_SIZE, order);
1264 static void do_apply_filter(APEContext *ctx, int version, APEFilter *f,
1265 int32_t *data, int count, int order, int fracbits)
1271 /* round fixedpoint scalar product */
1272 res = ctx->dsp.scalarproduct_and_madd_int16(f->coeffs, f->delay - order,
1273 f->adaptcoeffs - order,
1274 order, APESIGN(*data));
1275 res = (res + (1 << (fracbits - 1))) >> fracbits;
1279 /* Update the output history */
1280 *f->delay++ = av_clip_int16(res);
1282 if (version < 3980) {
1283 /* Version ??? to < 3.98 files (untested) */
1284 f->adaptcoeffs[0] = (res == 0) ? 0 : ((res >> 28) & 8) - 4;
1285 f->adaptcoeffs[-4] >>= 1;
1286 f->adaptcoeffs[-8] >>= 1;
1288 /* Version 3.98 and later files */
1290 /* Update the adaption coefficients */
1291 absres = FFABS(res);
1293 *f->adaptcoeffs = ((res & (-1<<31)) ^ (-1<<30)) >>
1294 (25 + (absres <= f->avg*3) + (absres <= f->avg*4/3));
1296 *f->adaptcoeffs = 0;
1298 f->avg += (absres - f->avg) / 16;
1300 f->adaptcoeffs[-1] >>= 1;
1301 f->adaptcoeffs[-2] >>= 1;
1302 f->adaptcoeffs[-8] >>= 1;
1307 /* Have we filled the history buffer? */
1308 if (f->delay == f->historybuffer + HISTORY_SIZE + (order * 2)) {
1309 memmove(f->historybuffer, f->delay - (order * 2),
1310 (order * 2) * sizeof(*f->historybuffer));
1311 f->delay = f->historybuffer + order * 2;
1312 f->adaptcoeffs = f->historybuffer + order;
1317 static void apply_filter(APEContext *ctx, APEFilter *f,
1318 int32_t *data0, int32_t *data1,
1319 int count, int order, int fracbits)
1321 do_apply_filter(ctx, ctx->fileversion, &f[0], data0, count, order, fracbits);
1323 do_apply_filter(ctx, ctx->fileversion, &f[1], data1, count, order, fracbits);
1326 static void ape_apply_filters(APEContext *ctx, int32_t *decoded0,
1327 int32_t *decoded1, int count)
1331 for (i = 0; i < APE_FILTER_LEVELS; i++) {
1332 if (!ape_filter_orders[ctx->fset][i])
1334 apply_filter(ctx, ctx->filters[i], decoded0, decoded1, count,
1335 ape_filter_orders[ctx->fset][i],
1336 ape_filter_fracbits[ctx->fset][i]);
1340 static int init_frame_decoder(APEContext *ctx)
1343 if ((ret = init_entropy_decoder(ctx)) < 0)
1345 init_predictor_decoder(ctx);
1347 for (i = 0; i < APE_FILTER_LEVELS; i++) {
1348 if (!ape_filter_orders[ctx->fset][i])
1350 init_filter(ctx, ctx->filters[i], ctx->filterbuf[i],
1351 ape_filter_orders[ctx->fset][i]);
1356 static void ape_unpack_mono(APEContext *ctx, int count)
1358 if (ctx->frameflags & APE_FRAMECODE_STEREO_SILENCE) {
1359 /* We are pure silence, so we're done. */
1360 av_log(ctx->avctx, AV_LOG_DEBUG, "pure silence mono\n");
1364 ctx->entropy_decode_mono(ctx, count);
1366 /* Now apply the predictor decoding */
1367 ctx->predictor_decode_mono(ctx, count);
1369 /* Pseudo-stereo - just copy left channel to right channel */
1370 if (ctx->channels == 2) {
1371 memcpy(ctx->decoded[1], ctx->decoded[0], count * sizeof(*ctx->decoded[1]));
1375 static void ape_unpack_stereo(APEContext *ctx, int count)
1377 int32_t left, right;
1378 int32_t *decoded0 = ctx->decoded[0];
1379 int32_t *decoded1 = ctx->decoded[1];
1381 if (ctx->frameflags & APE_FRAMECODE_STEREO_SILENCE) {
1382 /* We are pure silence, so we're done. */
1383 av_log(ctx->avctx, AV_LOG_DEBUG, "pure silence stereo\n");
1387 ctx->entropy_decode_stereo(ctx, count);
1389 /* Now apply the predictor decoding */
1390 ctx->predictor_decode_stereo(ctx, count);
1392 /* Decorrelate and scale to output depth */
1394 left = *decoded1 - (*decoded0 / 2);
1395 right = left + *decoded0;
1397 *(decoded0++) = left;
1398 *(decoded1++) = right;
1402 static int ape_decode_frame(AVCodecContext *avctx, void *data,
1403 int *got_frame_ptr, AVPacket *avpkt)
1405 AVFrame *frame = data;
1406 const uint8_t *buf = avpkt->data;
1407 APEContext *s = avctx->priv_data;
1414 /* this should never be negative, but bad things will happen if it is, so
1415 check it just to make sure. */
1416 av_assert0(s->samples >= 0);
1419 uint32_t nblocks, offset;
1426 if (avpkt->size < 8) {
1427 av_log(avctx, AV_LOG_ERROR, "Packet is too small\n");
1428 return AVERROR_INVALIDDATA;
1430 buf_size = avpkt->size & ~3;
1431 if (buf_size != avpkt->size) {
1432 av_log(avctx, AV_LOG_WARNING, "packet size is not a multiple of 4. "
1433 "extra bytes at the end will be skipped.\n");
1435 if (s->fileversion < 3950) // previous versions overread two bytes
1437 av_fast_malloc(&s->data, &s->data_size, buf_size);
1439 return AVERROR(ENOMEM);
1440 s->dsp.bswap_buf((uint32_t*)s->data, (const uint32_t*)buf, buf_size >> 2);
1441 memset(s->data + (buf_size & ~3), 0, buf_size & 3);
1443 s->data_end = s->data + buf_size;
1445 nblocks = bytestream_get_be32(&s->ptr);
1446 offset = bytestream_get_be32(&s->ptr);
1447 if (s->fileversion >= 3900) {
1449 av_log(avctx, AV_LOG_ERROR, "Incorrect offset passed\n");
1451 return AVERROR_INVALIDDATA;
1453 if (s->data_end - s->ptr < offset) {
1454 av_log(avctx, AV_LOG_ERROR, "Packet is too small\n");
1455 return AVERROR_INVALIDDATA;
1459 init_get_bits(&s->gb, s->ptr, (s->data_end - s->ptr) * 8);
1460 if (s->fileversion > 3800)
1461 skip_bits_long(&s->gb, offset * 8);
1463 skip_bits_long(&s->gb, offset);
1466 if (!nblocks || nblocks > INT_MAX) {
1467 av_log(avctx, AV_LOG_ERROR, "Invalid sample count: %u.\n", nblocks);
1468 return AVERROR_INVALIDDATA;
1470 s->samples = nblocks;
1472 /* Initialize the frame decoder */
1473 if (init_frame_decoder(s) < 0) {
1474 av_log(avctx, AV_LOG_ERROR, "Error reading frame header\n");
1475 return AVERROR_INVALIDDATA;
1484 blockstodecode = FFMIN(s->blocks_per_loop, s->samples);
1485 // for old files coefficients were not interleaved,
1486 // so we need to decode all of them at once
1487 if (s->fileversion < 3930)
1488 blockstodecode = s->samples;
1490 /* reallocate decoded sample buffer if needed */
1491 av_fast_malloc(&s->decoded_buffer, &s->decoded_size,
1492 2 * FFALIGN(blockstodecode, 8) * sizeof(*s->decoded_buffer));
1493 if (!s->decoded_buffer)
1494 return AVERROR(ENOMEM);
1495 memset(s->decoded_buffer, 0, s->decoded_size);
1496 s->decoded[0] = s->decoded_buffer;
1497 s->decoded[1] = s->decoded_buffer + FFALIGN(blockstodecode, 8);
1499 /* get output buffer */
1500 frame->nb_samples = blockstodecode;
1501 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
1506 if ((s->channels == 1) || (s->frameflags & APE_FRAMECODE_PSEUDO_STEREO))
1507 ape_unpack_mono(s, blockstodecode);
1509 ape_unpack_stereo(s, blockstodecode);
1514 av_log(avctx, AV_LOG_ERROR, "Error decoding frame\n");
1515 return AVERROR_INVALIDDATA;
1520 for (ch = 0; ch < s->channels; ch++) {
1521 sample8 = (uint8_t *)frame->data[ch];
1522 for (i = 0; i < blockstodecode; i++)
1523 *sample8++ = (s->decoded[ch][i] + 0x80) & 0xff;
1527 for (ch = 0; ch < s->channels; ch++) {
1528 sample16 = (int16_t *)frame->data[ch];
1529 for (i = 0; i < blockstodecode; i++)
1530 *sample16++ = s->decoded[ch][i];
1534 for (ch = 0; ch < s->channels; ch++) {
1535 sample24 = (int32_t *)frame->data[ch];
1536 for (i = 0; i < blockstodecode; i++)
1537 *sample24++ = s->decoded[ch][i] << 8;
1542 s->samples -= blockstodecode;
1546 return !s->samples ? avpkt->size : 0;
1549 static void ape_flush(AVCodecContext *avctx)
1551 APEContext *s = avctx->priv_data;
1555 #define OFFSET(x) offsetof(APEContext, x)
1556 #define PAR (AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_AUDIO_PARAM)
1557 static const AVOption options[] = {
1558 { "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" },
1559 { "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" },
1563 static const AVClass ape_decoder_class = {
1564 .class_name = "APE decoder",
1565 .item_name = av_default_item_name,
1567 .version = LIBAVUTIL_VERSION_INT,
1570 AVCodec ff_ape_decoder = {
1572 .type = AVMEDIA_TYPE_AUDIO,
1573 .id = AV_CODEC_ID_APE,
1574 .priv_data_size = sizeof(APEContext),
1575 .init = ape_decode_init,
1576 .close = ape_decode_close,
1577 .decode = ape_decode_frame,
1578 .capabilities = CODEC_CAP_SUBFRAMES | CODEC_CAP_DELAY | CODEC_CAP_DR1,
1580 .long_name = NULL_IF_CONFIG_SMALL("Monkey's Audio"),
1581 .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_U8P,
1584 AV_SAMPLE_FMT_NONE },
1585 .priv_class = &ape_decoder_class,