FFmpeg coverage

Line	Branch	Exec	Source
1			/*
2			* This file is part of FFmpeg.
3			*
4			* FFmpeg is free software; you can redistribute it and/or
5			* modify it under the terms of the GNU Lesser General Public
6			* License as published by the Free Software Foundation; either
7			* version 2.1 of the License, or (at your option) any later version.
8			*
9			* FFmpeg is distributed in the hope that it will be useful,
10			* but WITHOUT ANY WARRANTY; without even the implied warranty of
11			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12			* Lesser General Public License for more details.
13			*
14			* You should have received a copy of the GNU Lesser General Public
15			* License along with FFmpeg; if not, write to the Free Software
16			* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17			*/
18
19			#include "libavutil/crc.h"
20			#include "libavutil/float_dsp.h"
21			#include "libavutil/mem_internal.h"
22			#include "libavutil/tx.h"
23
24			#include "avcodec.h"
25			#include "bytestream.h"
26			#include "codec_internal.h"
27			#include "decode.h"
28			#include "get_bits.h"
29			#include "hca_data.h"
30
31			#define HCA_MASK 0x7f7f7f7f
32			#define MAX_CHANNELS 16
33
34			typedef struct ChannelContext {
35			DECLARE_ALIGNED(32, float, base)[128];
36			DECLARE_ALIGNED(32, float, factors)[128];
37			DECLARE_ALIGNED(32, float, imdct_in)[128];
38			DECLARE_ALIGNED(32, float, imdct_out)[128];
39			DECLARE_ALIGNED(32, float, imdct_prev)[128];
40			int8_t scale_factors[128];
41			uint8_t scale[128];
42			int8_t intensity[8];
43			int8_t *hfr_scale;
44			unsigned count;
45			int chan_type;
46			} ChannelContext;
47
48			typedef struct HCAContext {
49			const AVCRC *crc_table;
50
51			ChannelContext ch[MAX_CHANNELS];
52
53			uint8_t ath[128];
54			uint8_t cipher[256];
55			uint64_t key;
56			uint16_t subkey;
57
58			int ath_type;
59			int ciph_type;
60			unsigned hfr_group_count;
61			uint8_t track_count;
62			uint8_t channel_config;
63			uint8_t total_band_count;
64			uint8_t base_band_count;
65			uint8_t stereo_band_count;
66			uint8_t bands_per_hfr_group;
67
68			// Set during init() and freed on close(). Untouched on init_flush()
69			av_tx_fn tx_fn;
70			AVTXContext *tx_ctx;
71			AVFloatDSPContext *fdsp;
72			} HCAContext;
73
74		✗	static void cipher_init56_create_table(uint8_t *r, uint8_t key)
75			{
76		✗	const int mul = ((key & 1) << 3) | 5;
77		✗	const int add = (key & 0xE) | 1;
78
79		✗	key >>= 4;
80		✗	for (int i = 0; i < 16; i++) {
81		✗	key = (key * mul + add) & 0xF;
82		✗	r[i] = key;
83			}
84		✗	}
85
86		✗	static void cipher_init56(uint8_t *cipher, uint64_t keycode)
87			{
88			uint8_t base[256], base_r[16], base_c[16], kc[8], seed[16];
89
90			/* 56bit keycode encryption (given as a uint64_t number, but upper 8b aren't used) */
91			/* keycode = keycode - 1 */
92		✗	if (keycode != 0)
93		✗	keycode--;
94
95			/* init keycode table */
96		✗	for (int r = 0; r < (8-1); r++) {
97		✗	kc[r] = keycode & 0xFF;
98		✗	keycode = keycode >> 8;
99			}
100
101			/* init seed table */
102		✗	seed[ 0] = kc[1];
103		✗	seed[ 1] = kc[1] ^ kc[6];
104		✗	seed[ 2] = kc[2] ^ kc[3];
105		✗	seed[ 3] = kc[2];
106		✗	seed[ 4] = kc[2] ^ kc[1];
107		✗	seed[ 5] = kc[3] ^ kc[4];
108		✗	seed[ 6] = kc[3];
109		✗	seed[ 7] = kc[3] ^ kc[2];
110		✗	seed[ 8] = kc[4] ^ kc[5];
111		✗	seed[ 9] = kc[4];
112		✗	seed[10] = kc[4] ^ kc[3];
113		✗	seed[11] = kc[5] ^ kc[6];
114		✗	seed[12] = kc[5];
115		✗	seed[13] = kc[5] ^ kc[4];
116		✗	seed[14] = kc[6] ^ kc[1];
117		✗	seed[15] = kc[6];
118
119			/* init base table */
120		✗	cipher_init56_create_table(base_r, kc[0]);
121		✗	for (int r = 0; r < 16; r++) {
122			uint8_t nb;
123		✗	cipher_init56_create_table(base_c, seed[r]);
124		✗	nb = base_r[r] << 4;
125		✗	for (int c = 0; c < 16; c++)
126		✗	base[r*16 + c] = nb | base_c[c]; /* combine nibbles */
127			}
128
129			/* final shuffle table */
130			{
131		✗	unsigned x = 0;
132		✗	unsigned pos = 1;
133
134		✗	for (int i = 0; i < 256; i++) {
135		✗	x = (x + 17) & 0xFF;
136		✗	if (base[x] != 0 && base[x] != 0xFF)
137		✗	cipher[pos++] = base[x];
138			}
139		✗	cipher[0] = 0;
140		✗	cipher[0xFF] = 0xFF;
141			}
142		✗	}
143
144		✗	static void cipher_init(uint8_t *cipher, int type, uint64_t keycode, uint16_t subkey)
145			{
146		✗	switch (type) {
147		✗	case 56:
148		✗	if (keycode) {
149		✗	if (subkey)
150		✗	keycode = keycode * (((uint64_t)subkey<<16u)|((uint16_t)~subkey+2u));
151		✗	cipher_init56(cipher, keycode);
152			}
153		✗	break;
154		✗	case 0:
155		✗	for (int i = 0; i < 256; i++)
156		✗	cipher[i] = i;
157		✗	break;
158			}
159		✗	}
160
161		✗	static void ath_init1(uint8_t *ath, int sample_rate)
162			{
163			unsigned int index;
164		✗	unsigned int acc = 0;
165
166		✗	for (int i = 0; i < 128; i++) {
167		✗	acc += sample_rate;
168		✗	index = acc >> 13;
169
170		✗	if (index >= 654) {
171		✗	memset(ath+i, 0xFF, (128 - i));
172		✗	break;
173			}
174
175		✗	ath[i] = ath_base_curve[index];
176			}
177		✗	}
178
179		✗	static int ath_init(uint8_t *ath, int type, int sample_rate)
180			{
181		✗	switch (type) {
182		✗	case 0:
183			/* nothing to do */
184		✗	break;
185		✗	case 1:
186		✗	ath_init1(ath, sample_rate);
187		✗	break;
188		✗	default:
189		✗	return AVERROR_INVALIDDATA;
190			}
191
192		✗	return 0;
193			}
194
195		✗	static inline unsigned ceil2(unsigned a, unsigned b)
196			{
197		✗	return (b > 0) ? (a / b + ((a % b) ? 1 : 0)) : 0;
198			}
199
200		✗	static av_cold void init_flush(AVCodecContext *avctx)
201			{
202		✗	HCAContext *c = avctx->priv_data;
203
204		✗	memset(c, 0, offsetof(HCAContext, tx_fn));
205		✗	}
206
207		✗	static int init_hca(AVCodecContext *avctx, const uint8_t *extradata,
208			const int extradata_size)
209			{
210		✗	HCAContext *c = avctx->priv_data;
211		✗	GetByteContext gb0, *const gb = &gb0;
212		✗	int8_t r[16] = { 0 };
213			unsigned b, chunk;
214			int version, ret;
215
216		✗	init_flush(avctx);
217
218		✗	if (extradata_size < 36)
219		✗	return AVERROR_INVALIDDATA;
220
221		✗	bytestream2_init(gb, extradata, extradata_size);
222
223		✗	bytestream2_skipu(gb, 4);
224		✗	version = bytestream2_get_be16(gb);
225		✗	bytestream2_skipu(gb, 2);
226
227		✗	c->ath_type = version >= 0x200 ? 0 : 1;
228
229		✗	if ((bytestream2_get_be32u(gb) & HCA_MASK) != MKBETAG('f', 'm', 't', 0))
230		✗	return AVERROR_INVALIDDATA;
231		✗	bytestream2_skipu(gb, 4);
232		✗	bytestream2_skipu(gb, 4);
233		✗	bytestream2_skipu(gb, 4);
234
235		✗	chunk = bytestream2_get_be32u(gb) & HCA_MASK;
236		✗	if (chunk == MKBETAG('c', 'o', 'm', 'p')) {
237		✗	bytestream2_skipu(gb, 2);
238		✗	bytestream2_skipu(gb, 1);
239		✗	bytestream2_skipu(gb, 1);
240		✗	c->track_count = bytestream2_get_byteu(gb);
241		✗	c->channel_config = bytestream2_get_byteu(gb);
242		✗	c->total_band_count = bytestream2_get_byteu(gb);
243		✗	c->base_band_count = bytestream2_get_byteu(gb);
244		✗	c->stereo_band_count = bytestream2_get_byte (gb);
245		✗	c->bands_per_hfr_group = bytestream2_get_byte (gb);
246		✗	} else if (chunk == MKBETAG('d', 'e', 'c', 0)) {
247		✗	bytestream2_skipu(gb, 2);
248		✗	bytestream2_skipu(gb, 1);
249		✗	bytestream2_skipu(gb, 1);
250		✗	c->total_band_count = bytestream2_get_byteu(gb) + 1;
251		✗	c->base_band_count = bytestream2_get_byteu(gb) + 1;
252		✗	c->track_count = bytestream2_peek_byteu(gb) >> 4;
253		✗	c->channel_config = bytestream2_get_byteu(gb) & 0xF;
254		✗	if (!bytestream2_get_byteu(gb))
255		✗	c->base_band_count = c->total_band_count;
256		✗	c->stereo_band_count = c->total_band_count - c->base_band_count;
257		✗	c->bands_per_hfr_group = 0;
258			} else
259		✗	return AVERROR_INVALIDDATA;
260
261		✗	if (c->total_band_count > FF_ARRAY_ELEMS(c->ch->imdct_in))
262		✗	return AVERROR_INVALIDDATA;
263
264		✗	while (bytestream2_get_bytes_left(gb) >= 4) {
265		✗	chunk = bytestream2_get_be32u(gb) & HCA_MASK;
266		✗	if (chunk == MKBETAG('v', 'b', 'r', 0)) {
267		✗	bytestream2_skip(gb, 2 + 2);
268		✗	} else if (chunk == MKBETAG('a', 't', 'h', 0)) {
269		✗	c->ath_type = bytestream2_get_be16(gb);
270		✗	} else if (chunk == MKBETAG('r', 'v', 'a', 0)) {
271		✗	bytestream2_skip(gb, 4);
272		✗	} else if (chunk == MKBETAG('c', 'o', 'm', 'm')) {
273		✗	bytestream2_skip(gb, bytestream2_get_byte(gb) * 8);
274		✗	} else if (chunk == MKBETAG('c', 'i', 'p', 'h')) {
275		✗	c->ciph_type = bytestream2_get_be16(gb);
276		✗	} else if (chunk == MKBETAG('l', 'o', 'o', 'p')) {
277		✗	bytestream2_skip(gb, 4 + 4 + 2 + 2);
278		✗	} else if (chunk == MKBETAG('p', 'a', 'd', 0)) {
279		✗	break;
280			} else {
281		✗	break;
282			}
283			}
284
285		✗	if (bytestream2_get_bytes_left(gb) >= 10) {
286		✗	bytestream2_skip(gb, bytestream2_get_bytes_left(gb) - 10);
287		✗	c->key = bytestream2_get_be64u(gb);
288		✗	c->subkey = bytestream2_get_be16u(gb);
289			}
290
291		✗	cipher_init(c->cipher, c->ciph_type, c->key, c->subkey);
292
293		✗	ret = ath_init(c->ath, c->ath_type, avctx->sample_rate);
294		✗	if (ret < 0)
295		✗	return ret;
296
297		✗	if (!c->track_count)
298		✗	c->track_count = 1;
299
300		✗	b = avctx->ch_layout.nb_channels / c->track_count;
301		✗	if (c->stereo_band_count && b > 1) {
302		✗	int8_t *x = r;
303
304		✗	for (int i = 0; i < c->track_count; i++, x+=b) {
305		✗	switch (b) {
306		✗	case 2:
307			case 3:
308		✗	x[0] = 1;
309		✗	x[1] = 2;
310		✗	break;
311		✗	case 4:
312		✗	x[0]=1; x[1] = 2;
313		✗	if (c->channel_config == 0) {
314		✗	x[2]=1;
315		✗	x[3]=2;
316			}
317		✗	break;
318		✗	case 5:
319		✗	x[0]=1; x[1] = 2;
320		✗	if (c->channel_config <= 2) {
321		✗	x[3]=1;
322		✗	x[4]=2;
323			}
324		✗	break;
325		✗	case 6:
326			case 7:
327		✗	x[0] = 1; x[1] = 2; x[4] = 1; x[5] = 2;
328		✗	break;
329		✗	case 8:
330		✗	x[0] = 1; x[1] = 2; x[4] = 1; x[5] = 2; x[6] = 1; x[7] = 2;
331		✗	break;
332			}
333			}
334			}
335
336		✗	if (c->total_band_count < c->base_band_count)
337		✗	return AVERROR_INVALIDDATA;
338
339		✗	c->hfr_group_count = ceil2(c->total_band_count - (c->base_band_count + c->stereo_band_count),
340		✗	c->bands_per_hfr_group);
341
342		✗	if (c->base_band_count + c->stereo_band_count + (unsigned long)c->hfr_group_count > 128ULL)
343		✗	return AVERROR_INVALIDDATA;
344
345		✗	for (int i = 0; i < avctx->ch_layout.nb_channels; i++) {
346		✗	c->ch[i].chan_type = r[i];
347		✗	c->ch[i].count = c->base_band_count + ((r[i] != 2) ? c->stereo_band_count : 0);
348		✗	c->ch[i].hfr_scale = &c->ch[i].scale_factors[c->base_band_count + c->stereo_band_count];
349		✗	if (c->ch[i].count > 128)
350		✗	return AVERROR_INVALIDDATA;
351			}
352
353			// Done last to signal init() finished
354		✗	c->crc_table = av_crc_get_table(AV_CRC_16_ANSI);
355
356		✗	return 0;
357			}
358
359		✗	static av_cold int decode_init(AVCodecContext *avctx)
360			{
361		✗	HCAContext *c = avctx->priv_data;
362		✗	float scale = 1.f / 8.f;
363			int ret;
364
365		✗	avctx->sample_fmt = AV_SAMPLE_FMT_FLTP;
366
367		✗	if (avctx->ch_layout.nb_channels <= 0 || avctx->ch_layout.nb_channels > FF_ARRAY_ELEMS(c->ch))
368		✗	return AVERROR(EINVAL);
369
370		✗	c->fdsp = avpriv_float_dsp_alloc(avctx->flags & AV_CODEC_FLAG_BITEXACT);
371		✗	if (!c->fdsp)
372		✗	return AVERROR(ENOMEM);
373
374		✗	ret = av_tx_init(&c->tx_ctx, &c->tx_fn, AV_TX_FLOAT_MDCT, 1, 128, &scale, 0);
375		✗	if (ret < 0)
376		✗	return ret;
377
378		✗	if (avctx->extradata_size != 0 && avctx->extradata_size < 36)
379		✗	return AVERROR_INVALIDDATA;
380
381		✗	if (!avctx->extradata_size)
382		✗	return 0;
383
384		✗	return init_hca(avctx, avctx->extradata, avctx->extradata_size);
385			}
386
387		✗	static void run_imdct(HCAContext *c, ChannelContext *ch, int index, float *out)
388			{
389		✗	c->tx_fn(c->tx_ctx, ch->imdct_out, ch->imdct_in, sizeof(float));
390
391		✗	c->fdsp->vector_fmul_window(out, ch->imdct_prev + (128 >> 1),
392		✗	ch->imdct_out, window, 128 >> 1);
393
394		✗	memcpy(ch->imdct_prev, ch->imdct_out, 128 * sizeof(float));
395		✗	}
396
397		✗	static void apply_intensity_stereo(HCAContext *s, ChannelContext *ch1, ChannelContext *ch2,
398			int index, unsigned band_count, unsigned base_band_count,
399			unsigned stereo_band_count)
400			{
401		✗	float ratio_l = intensity_ratio_table[ch2->intensity[index]];
402		✗	float ratio_r = ratio_l - 2.0f;
403		✗	float *c1 = &ch1->imdct_in[base_band_count];
404		✗	float *c2 = &ch2->imdct_in[base_band_count];
405
406		✗	if (ch1->chan_type != 1 || !stereo_band_count)
407		✗	return;
408
409		✗	for (int i = 0; i < band_count; i++) {
410		✗	c2[i] = c1[i] * ratio_r;
411		✗	c1[i] *= ratio_l;
412			}
413			}
414
415		✗	static void reconstruct_hfr(HCAContext *s, ChannelContext *ch,
416			unsigned hfr_group_count,
417			unsigned bands_per_hfr_group,
418			unsigned start_band, unsigned total_band_count)
419			{
420		✗	if (ch->chan_type == 2 || !bands_per_hfr_group)
421		✗	return;
422
423		✗	for (int i = 0, k = start_band, l = start_band - 1; i < hfr_group_count; i++){
424		✗	for (int j = 0; j < bands_per_hfr_group && k < total_band_count && l >= 0; j++, k++, l--){
425		✗	ch->imdct_in[k] = scale_conversion_table[ scale_conv_bias +
426		✗	av_clip_intp2(ch->hfr_scale[i] - ch->scale_factors[l], 6) ] * ch->imdct_in[l];
427			}
428			}
429
430		✗	ch->imdct_in[127] = 0;
431			}
432
433		✗	static void dequantize_coefficients(HCAContext *c, ChannelContext *ch,
434			GetBitContext *gb)
435			{
436		✗	const float *base = ch->base;
437		✗	float *factors = ch->factors;
438		✗	float *out = ch->imdct_in;
439
440		✗	for (int i = 0; i < ch->count; i++) {
441		✗	unsigned scale = ch->scale[i];
442		✗	int nb_bits = max_bits_table[scale];
443		✗	int value = get_bitsz(gb, nb_bits);
444			float factor;
445
446		✗	if (scale > 7) {
447		✗	value = (1 - ((value & 1) << 1)) * (value >> 1);
448		✗	if (!value)
449		✗	skip_bits_long(gb, -1);
450		✗	factor = value;
451			} else {
452		✗	value += scale << 4;
453		✗	skip_bits_long(gb, quant_spectrum_bits[value] - nb_bits);
454		✗	factor = quant_spectrum_value[value];
455			}
456		✗	factors[i] = factor;
457			}
458
459		✗	memset(factors + ch->count, 0, 512 - ch->count * sizeof(*factors));
460		✗	c->fdsp->vector_fmul(out, factors, base, 128);
461		✗	}
462
463		✗	static void unpack(HCAContext *c, ChannelContext *ch,
464			GetBitContext *gb,
465			unsigned hfr_group_count,
466			int packed_noise_level,
467			const uint8_t *ath)
468			{
469		✗	int delta_bits = get_bits(gb, 3);
470
471		✗	if (delta_bits > 5) {
472		✗	for (int i = 0; i < ch->count; i++)
473		✗	ch->scale_factors[i] = get_bits(gb, 6);
474		✗	} else if (delta_bits) {
475		✗	int factor = get_bits(gb, 6);
476		✗	int max_value = (1 << delta_bits) - 1;
477		✗	int half_max = max_value >> 1;
478
479		✗	ch->scale_factors[0] = factor;
480		✗	for (int i = 1; i < ch->count; i++){
481		✗	int delta = get_bits(gb, delta_bits);
482
483		✗	if (delta == max_value) {
484		✗	factor = get_bits(gb, 6);
485			} else {
486		✗	factor += delta - half_max;
487			}
488		✗	factor = av_clip_uintp2(factor, 6);
489
490		✗	ch->scale_factors[i] = factor;
491			}
492			} else {
493		✗	memset(ch->scale_factors, 0, 128);
494			}
495
496		✗	if (ch->chan_type == 2){
497		✗	ch->intensity[0] = get_bits(gb, 4);
498		✗	if (ch->intensity[0] < 15) {
499		✗	for (int i = 1; i < 8; i++)
500		✗	ch->intensity[i] = get_bits(gb, 4);
501			}
502			} else {
503		✗	for (int i = 0; i < hfr_group_count; i++)
504		✗	ch->hfr_scale[i] = get_bits(gb, 6);
505			}
506
507		✗	for (int i = 0; i < ch->count; i++) {
508		✗	int scale = ch->scale_factors[i];
509
510		✗	if (scale) {
511		✗	scale = c->ath[i] + ((packed_noise_level + i) >> 8) - ((scale * 5) >> 1) + 2;
512		✗	scale = scale_table[av_clip(scale, 0, 58)];
513			}
514		✗	ch->scale[i] = scale;
515			}
516
517		✗	memset(ch->scale + ch->count, 0, sizeof(ch->scale) - ch->count);
518
519		✗	for (int i = 0; i < ch->count; i++)
520		✗	ch->base[i] = dequantizer_scaling_table[ch->scale_factors[i]] * quant_step_size[ch->scale[i]];
521		✗	}
522
523		✗	static int decode_frame(AVCodecContext *avctx, AVFrame *frame,
524			int *got_frame_ptr, AVPacket *avpkt)
525			{
526		✗	HCAContext *c = avctx->priv_data;
527		✗	int ch, offset = 0, ret, packed_noise_level;
528		✗	GetBitContext gb0, *const gb = &gb0;
529			float **samples;
530
531		✗	if (avpkt->size <= 8)
532		✗	return AVERROR_INVALIDDATA;
533
534		✗	if (AV_RN16(avpkt->data) != 0xFFFF) {
535		✗	if ((AV_RL32(avpkt->data)) != MKTAG('H','C','A',0)) {
536		✗	return AVERROR_INVALIDDATA;
537		✗	} else if (AV_RB16(avpkt->data + 6) <= avpkt->size) {
538		✗	ret = init_hca(avctx, avpkt->data, AV_RB16(avpkt->data + 6));
539		✗	if (ret < 0)
540		✗	return ret;
541		✗	offset = AV_RB16(avpkt->data + 6);
542		✗	if (offset == avpkt->size)
543		✗	return avpkt->size;
544			} else {
545		✗	return AVERROR_INVALIDDATA;
546			}
547			}
548
549		✗	if (!c->crc_table)
550		✗	return AVERROR_INVALIDDATA;
551
552		✗	if (c->key || c->subkey) {
553		✗	uint8_t *data, *cipher = c->cipher;
554
555		✗	if ((ret = av_packet_make_writable(avpkt)) < 0)
556		✗	return ret;
557		✗	data = avpkt->data;
558		✗	for (int n = 0; n < avpkt->size; n++)
559		✗	data[n] = cipher[data[n]];
560			}
561
562		✗	if (avctx->err_recognition & AV_EF_CRCCHECK) {
563		✗	if (av_crc(c->crc_table, 0, avpkt->data + offset, avpkt->size - offset))
564		✗	return AVERROR_INVALIDDATA;
565			}
566
567		✗	if ((ret = init_get_bits8(gb, avpkt->data + offset, avpkt->size - offset)) < 0)
568		✗	return ret;
569
570		✗	if (get_bits(gb, 16) != 0xFFFF)
571		✗	return AVERROR_INVALIDDATA;
572
573		✗	frame->nb_samples = 1024;
574		✗	if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
575		✗	return ret;
576		✗	samples = (float **)frame->extended_data;
577
578		✗	packed_noise_level = (get_bits(gb, 9) << 8) - get_bits(gb, 7);
579
580		✗	for (ch = 0; ch < avctx->ch_layout.nb_channels; ch++)
581		✗	unpack(c, &c->ch[ch], gb, c->hfr_group_count, packed_noise_level, c->ath);
582
583		✗	for (int i = 0; i < 8; i++) {
584		✗	for (ch = 0; ch < avctx->ch_layout.nb_channels; ch++)
585		✗	dequantize_coefficients(c, &c->ch[ch], gb);
586		✗	for (ch = 0; ch < avctx->ch_layout.nb_channels; ch++)
587		✗	reconstruct_hfr(c, &c->ch[ch], c->hfr_group_count, c->bands_per_hfr_group,
588		✗	c->stereo_band_count + c->base_band_count, c->total_band_count);
589		✗	for (ch = 0; ch < avctx->ch_layout.nb_channels - 1; ch++)
590		✗	apply_intensity_stereo(c, &c->ch[ch], &c->ch[ch+1], i,
591		✗	c->total_band_count - c->base_band_count,
592		✗	c->base_band_count, c->stereo_band_count);
593		✗	for (ch = 0; ch < avctx->ch_layout.nb_channels; ch++)
594		✗	run_imdct(c, &c->ch[ch], i, samples[ch] + i * 128);
595			}
596
597		✗	*got_frame_ptr = 1;
598
599		✗	return avpkt->size;
600			}
601
602		✗	static av_cold int decode_close(AVCodecContext *avctx)
603			{
604		✗	HCAContext *c = avctx->priv_data;
605
606		✗	av_freep(&c->fdsp);
607		✗	av_tx_uninit(&c->tx_ctx);
608
609		✗	return 0;
610			}
611
612		✗	static av_cold void decode_flush(AVCodecContext *avctx)
613			{
614		✗	HCAContext *c = avctx->priv_data;
615
616		✗	for (int ch = 0; ch < MAX_CHANNELS; ch++)
617		✗	memset(c->ch[ch].imdct_prev, 0, sizeof(c->ch[ch].imdct_prev));
618		✗	}
619
620			const FFCodec ff_hca_decoder = {
621			.p.name = "hca",
622			CODEC_LONG_NAME("CRI HCA"),
623			.p.type = AVMEDIA_TYPE_AUDIO,
624			.p.id = AV_CODEC_ID_HCA,
625			.priv_data_size = sizeof(HCAContext),
626			.init = decode_init,
627			FF_CODEC_DECODE_CB(decode_frame),
628			.flush = decode_flush,
629			.close = decode_close,
630			.p.capabilities = AV_CODEC_CAP_DR1,
631			.caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
632			.p.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
633			AV_SAMPLE_FMT_NONE },
634			};
635