2 * Interplay ACM decoder
4 * Copyright (c) 2004-2008 Marko Kreen
5 * Copyright (c) 2008 Adam Gashlin
6 * Copyright (c) 2015 Paul B Mahol
8 * Permission to use, copy, modify, and distribute this software for any
9 * purpose with or without fee is hereby granted, provided that the above
10 * copyright notice and this permission notice appear in all copies.
12 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
13 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
14 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
15 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
16 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
17 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
18 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
21 #include "libavutil/intreadwrite.h"
23 #define BITSTREAM_READER_LE
28 static const int8_t map_1bit[] = { -1, +1 };
29 static const int8_t map_2bit_near[] = { -2, -1, +1, +2 };
30 static const int8_t map_2bit_far[] = { -3, -2, +2, +3 };
31 static const int8_t map_3bit[] = { -4, -3, -2, -1, +1, +2, +3, +4 };
33 static int mul_3x3 [3 * 3 * 3];
34 static int mul_3x5 [5 * 5 * 5];
35 static int mul_2x11[11 * 11];
37 typedef struct InterplayACMContext {
55 } InterplayACMContext;
57 static av_cold int decode_init(AVCodecContext *avctx)
59 InterplayACMContext *s = avctx->priv_data;
62 if (avctx->extradata_size < 14)
63 return AVERROR_INVALIDDATA;
65 s->level = AV_RL16(avctx->extradata + 12) & 0xf;
66 s->rows = AV_RL16(avctx->extradata + 12) >> 4;
67 s->cols = 1 << s->level;
68 s->wrapbuf_len = 2 * s->cols - 2;
69 s->block_len = s->rows * s->cols;
70 s->max_framesize = s->block_len;
72 s->block = av_calloc(s->block_len, sizeof(int));
73 s->wrapbuf = av_calloc(s->wrapbuf_len, sizeof(int));
74 s->ampbuf = av_calloc(0x10000, sizeof(int));
75 s->bitstream = av_calloc(s->max_framesize, sizeof(*s->bitstream));
76 if (!s->block || !s->wrapbuf || !s->ampbuf || !s->bitstream)
77 return AVERROR(ENOMEM);
79 s->midbuf = s->ampbuf + 0x8000;
80 avctx->sample_fmt = AV_SAMPLE_FMT_S16;
82 for (x3 = 0; x3 < 3; x3++)
83 for (x2 = 0; x2 < 3; x2++)
84 for (x1 = 0; x1 < 3; x1++)
85 mul_3x3[x1 + x2 * 3 + x3* 3 * 3] = x1 + (x2 << 4) + (x3 << 8);
86 for (x3 = 0; x3 < 5; x3++)
87 for (x2 = 0; x2 < 5; x2++)
88 for (x1 = 0; x1 < 5; x1++)
89 mul_3x5[x1 + x2 * 5 + x3 * 5 * 5] = x1 + (x2 << 4) + (x3 << 8);
90 for (x2 = 0; x2 < 11; x2++)
91 for (x1 = 0; x1 < 11; x1++)
92 mul_2x11[x1 + x2 * 11] = x1 + (x2 << 4);
97 #define set_pos(s, r, c, idx) do { \
98 unsigned pos = ((r) << s->level) + (c); \
99 s->block[pos] = s->midbuf[(idx)]; \
102 static int zero(InterplayACMContext *s, unsigned ind, unsigned col)
106 for (i = 0; i < s->rows; i++)
107 set_pos(s, i, col, 0);
111 static int bad(InterplayACMContext *s, unsigned ind, unsigned col)
113 return AVERROR_INVALIDDATA;
116 static int linear(InterplayACMContext *s, unsigned ind, unsigned col)
118 GetBitContext *gb = &s->gb;
120 int b, middle = 1 << (ind - 1);
122 for (i = 0; i < s->rows; i++) {
123 b = get_bits(gb, ind);
124 set_pos(s, i, col, b - middle);
129 static int k13(InterplayACMContext *s, unsigned ind, unsigned col)
131 GetBitContext *gb = &s->gb;
134 for (i = 0; i < s->rows; i++) {
137 set_pos(s, i++, col, 0);
140 set_pos(s, i, col, 0);
145 set_pos(s, i, col, 0);
149 set_pos(s, i, col, map_1bit[b]);
154 static int k12(InterplayACMContext *s, unsigned ind, unsigned col)
156 GetBitContext *gb = &s->gb;
159 for (i = 0; i < s->rows; i++) {
162 set_pos(s, i, col, 0);
167 set_pos(s, i, col, map_1bit[b]);
172 static int k24(InterplayACMContext *s, unsigned ind, unsigned col)
174 GetBitContext *gb = &s->gb;
177 for (i = 0; i < s->rows; i++) {
180 set_pos(s, i++, col, 0);
181 if (i >= s->rows) break;
182 set_pos(s, i, col, 0);
188 set_pos(s, i, col, 0);
193 set_pos(s, i, col, map_2bit_near[b]);
198 static int k23(InterplayACMContext *s, unsigned ind, unsigned col)
200 GetBitContext *gb = &s->gb;
203 for (i = 0; i < s->rows; i++) {
206 set_pos(s, i, col, 0);
211 set_pos(s, i, col, map_2bit_near[b]);
216 static int k35(InterplayACMContext *s, unsigned ind, unsigned col)
218 GetBitContext *gb = &s->gb;
221 for (i = 0; i < s->rows; i++) {
224 set_pos(s, i++, col, 0);
227 set_pos(s, i, col, 0);
233 set_pos(s, i, col, 0);
240 set_pos(s, i, col, map_1bit[b]);
245 set_pos(s, i, col, map_2bit_far[b]);
250 static int k34(InterplayACMContext *s, unsigned ind, unsigned col)
252 GetBitContext *gb = &s->gb;
255 for (i = 0; i < s->rows; i++) {
258 set_pos(s, i, col, 0);
265 set_pos(s, i, col, map_1bit[b]);
270 set_pos(s, i, col, map_2bit_far[b]);
275 static int k45(InterplayACMContext *s, unsigned ind, unsigned col)
277 GetBitContext *gb = &s->gb;
280 for (i = 0; i < s->rows; i++) {
283 set_pos(s, i, col, 0); i++;
286 set_pos(s, i, col, 0);
292 set_pos(s, i, col, 0);
297 set_pos(s, i, col, map_3bit[b]);
302 static int k44(InterplayACMContext *s, unsigned ind, unsigned col)
304 GetBitContext *gb = &s->gb;
307 for (i = 0; i < s->rows; i++) {
310 set_pos(s, i, col, 0);
315 set_pos(s, i, col, map_3bit[b]);
320 static int t15(InterplayACMContext *s, unsigned ind, unsigned col)
322 GetBitContext *gb = &s->gb;
326 for (i = 0; i < s->rows; i++) {
327 /* b = (x1) + (x2 * 3) + (x3 * 9) */
330 n1 = (mul_3x3[b] & 0x0F) - 1;
331 n2 = ((mul_3x3[b] >> 4) & 0x0F) - 1;
332 n3 = ((mul_3x3[b] >> 8) & 0x0F) - 1;
334 set_pos(s, i++, col, n1);
337 set_pos(s, i++, col, n2);
340 set_pos(s, i, col, n3);
345 static int t27(InterplayACMContext *s, unsigned ind, unsigned col)
347 GetBitContext *gb = &s->gb;
351 for (i = 0; i < s->rows; i++) {
352 /* b = (x1) + (x2 * 5) + (x3 * 25) */
355 n1 = (mul_3x5[b] & 0x0F) - 2;
356 n2 = ((mul_3x5[b] >> 4) & 0x0F) - 2;
357 n3 = ((mul_3x5[b] >> 8) & 0x0F) - 2;
359 set_pos(s, i++, col, n1);
362 set_pos(s, i++, col, n2);
365 set_pos(s, i, col, n3);
370 static int t37(InterplayACMContext *s, unsigned ind, unsigned col)
372 GetBitContext *gb = &s->gb;
375 for (i = 0; i < s->rows; i++) {
376 /* b = (x1) + (x2 * 11) */
379 n1 = (mul_2x11[b] & 0x0F) - 5;
380 n2 = ((mul_2x11[b] >> 4) & 0x0F) - 5;
382 set_pos(s, i++, col, n1);
385 set_pos(s, i, col, n2);
390 typedef int (*filler)(InterplayACMContext *s, unsigned ind, unsigned col);
392 static const filler filler_list[] = {
393 zero, bad, bad, linear,
394 linear, linear, linear, linear,
395 linear, linear, linear, linear,
396 linear, linear, linear, linear,
397 linear, k13, k12, t15,
403 static int fill_block(InterplayACMContext *s)
405 GetBitContext *gb = &s->gb;
409 for (i = 0; i < s->cols; i++) {
410 ind = get_bits(gb, 5);
411 ret = filler_list[ind](s, ind, i);
418 static void juggle(int *wrap_p, int *block_p, unsigned sub_len, unsigned sub_count)
421 int *p, r0, r1, r2, r3;
423 for (i = 0; i < sub_len; i++) {
427 for (j = 0; j < sub_count/2; j++) {
429 *p = r1 * 2 + (r0 + r2);
432 *p = r2 * 2 - (r1 + r3);
444 static void juggle_block(InterplayACMContext *s)
446 unsigned sub_count, sub_len, todo_count, step_subcount, i;
447 int *wrap_p, *block_p, *p;
449 /* juggle only if subblock_len > 1 */
453 /* 2048 / subblock_len */
457 step_subcount = (2048 >> s->level) - 2;
459 /* Apply juggle() (rows)x(cols)
460 * from (step_subcount * 2) x (subblock_len/2)
461 * to (step_subcount * subblock_len) x (1)
463 todo_count = s->rows;
467 sub_count = step_subcount;
468 if (sub_count > todo_count)
469 sub_count = todo_count;
471 sub_len = s->cols / 2;
474 juggle(wrap_p, block_p, sub_len, sub_count);
475 wrap_p += sub_len * 2;
477 for (i = 0, p = block_p; i < sub_count; i++) {
482 while (sub_len > 1) {
485 juggle(wrap_p, block_p, sub_len, sub_count);
486 wrap_p += sub_len * 2;
489 if (todo_count <= step_subcount)
492 todo_count -= step_subcount;
493 block_p += step_subcount << s->level;
497 static int decode_block(InterplayACMContext *s)
499 GetBitContext *gb = &s->gb;
500 int pwr, count, val, i, x, ret;
502 pwr = get_bits(gb, 4);
503 val = get_bits(gb, 16);
507 for (i = 0, x = 0; i < count; i++) {
512 for (i = 1, x = -val; i <= count; i++) {
526 static int decode_frame(AVCodecContext *avctx, void *data,
527 int *got_frame_ptr, AVPacket *pkt)
529 InterplayACMContext *s = avctx->priv_data;
530 GetBitContext *gb = &s->gb;
531 AVFrame *frame = data;
534 int ret, n, buf_size, input_buf_size;
536 if (!pkt->size && !s->bitstream_size) {
541 buf_size = FFMIN(pkt->size, s->max_framesize - s->bitstream_size);
542 input_buf_size = buf_size;
543 if (s->bitstream_index + s->bitstream_size + buf_size > s->max_framesize) {
544 memmove(s->bitstream, &s->bitstream[s->bitstream_index], s->bitstream_size);
545 s->bitstream_index = 0;
548 memcpy(&s->bitstream[s->bitstream_index + s->bitstream_size], pkt->data, buf_size);
549 buf = &s->bitstream[s->bitstream_index];
550 buf_size += s->bitstream_size;
551 s->bitstream_size = buf_size;
552 if (buf_size < s->max_framesize && pkt->data) {
554 return input_buf_size;
557 if ((ret = init_get_bits8(gb, buf, buf_size)) < 0)
560 frame->nb_samples = s->block_len / avctx->channels;
561 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
564 skip_bits(gb, s->skip);
565 ret = decode_block(s);
569 samples = (int16_t *)frame->data[0];
570 for (n = 0; n < frame->nb_samples * avctx->channels; n++) {
571 int val = s->block[n] >> s->level;
576 s->skip = get_bits_count(gb) - 8 * (get_bits_count(gb) / 8);
577 n = get_bits_count(gb) / 8;
579 if (n > buf_size && pkt->data) {
580 s->bitstream_size = 0;
581 s->bitstream_index = 0;
582 return AVERROR_INVALIDDATA;
585 if (s->bitstream_size) {
586 s->bitstream_index += n;
587 s->bitstream_size -= n;
588 return input_buf_size;
593 static av_cold int decode_close(AVCodecContext *avctx)
595 InterplayACMContext *s = avctx->priv_data;
598 av_freep(&s->wrapbuf);
599 av_freep(&s->ampbuf);
600 av_freep(&s->bitstream);
601 s->bitstream_size = 0;
606 AVCodec ff_interplay_acm_decoder = {
607 .name = "interplayacm",
608 .long_name = NULL_IF_CONFIG_SMALL("Interplay ACM"),
609 .type = AVMEDIA_TYPE_AUDIO,
610 .id = AV_CODEC_ID_INTERPLAY_ACM,
612 .close = decode_close,
613 .decode = decode_frame,
614 .capabilities = AV_CODEC_CAP_DELAY | AV_CODEC_CAP_DR1,
615 .priv_data_size = sizeof(InterplayACMContext),