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
27 static const int8_t map_1bit[] = { -1, +1 };
28 static const int8_t map_2bit_near[] = { -2, -1, +1, +2 };
29 static const int8_t map_2bit_far[] = { -3, -2, +2, +3 };
30 static const int8_t map_3bit[] = { -4, -3, -2, -1, +1, +2, +3, +4 };
32 static int mul_3x3 [3 * 3 * 3];
33 static int mul_3x5 [5 * 5 * 5];
34 static int mul_2x11[11 * 11];
36 typedef struct InterplayACMContext {
54 } InterplayACMContext;
56 static av_cold int decode_init(AVCodecContext *avctx)
58 InterplayACMContext *s = avctx->priv_data;
61 if (avctx->extradata_size < 14)
62 return AVERROR_INVALIDDATA;
64 s->level = AV_RL16(avctx->extradata + 12) & 0xf;
65 s->rows = AV_RL16(avctx->extradata + 12) >> 4;
66 s->cols = 1 << s->level;
67 s->wrapbuf_len = 2 * s->cols - 2;
68 s->block_len = s->rows * s->cols;
69 s->max_framesize = s->block_len;
71 s->block = av_calloc(s->block_len, sizeof(int));
72 s->wrapbuf = av_calloc(s->wrapbuf_len, sizeof(int));
73 s->ampbuf = av_calloc(0x10000, sizeof(int));
74 s->bitstream = av_calloc(s->max_framesize, sizeof(*s->bitstream));
75 if (!s->block || !s->wrapbuf || !s->ampbuf || !s->bitstream)
76 return AVERROR(ENOMEM);
78 s->midbuf = s->ampbuf + 0x8000;
79 avctx->sample_fmt = AV_SAMPLE_FMT_S16;
81 for (x3 = 0; x3 < 3; x3++)
82 for (x2 = 0; x2 < 3; x2++)
83 for (x1 = 0; x1 < 3; x1++)
84 mul_3x3[x1 + x2 * 3 + x3* 3 * 3] = x1 + (x2 << 4) + (x3 << 8);
85 for (x3 = 0; x3 < 5; x3++)
86 for (x2 = 0; x2 < 5; x2++)
87 for (x1 = 0; x1 < 5; x1++)
88 mul_3x5[x1 + x2 * 5 + x3 * 5 * 5] = x1 + (x2 << 4) + (x3 << 8);
89 for (x2 = 0; x2 < 11; x2++)
90 for (x1 = 0; x1 < 11; x1++)
91 mul_2x11[x1 + x2 * 11] = x1 + (x2 << 4);
96 #define set_pos(s, r, c, idx) do { \
97 unsigned pos = ((r) << s->level) + (c); \
98 s->block[pos] = s->midbuf[(idx)]; \
101 static int zero(InterplayACMContext *s, unsigned ind, unsigned col)
105 for (i = 0; i < s->rows; i++)
106 set_pos(s, i, col, 0);
110 static int bad(InterplayACMContext *s, unsigned ind, unsigned col)
112 return AVERROR_INVALIDDATA;
115 static int linear(InterplayACMContext *s, unsigned ind, unsigned col)
117 GetBitContext *gb = &s->gb;
119 int b, middle = 1 << (ind - 1);
121 for (i = 0; i < s->rows; i++) {
122 b = get_bits(gb, ind);
123 set_pos(s, i, col, b - middle);
128 static int k13(InterplayACMContext *s, unsigned ind, unsigned col)
130 GetBitContext *gb = &s->gb;
133 for (i = 0; i < s->rows; i++) {
136 set_pos(s, i++, col, 0);
139 set_pos(s, i, col, 0);
144 set_pos(s, i, col, 0);
148 set_pos(s, i, col, map_1bit[b]);
153 static int k12(InterplayACMContext *s, unsigned ind, unsigned col)
155 GetBitContext *gb = &s->gb;
158 for (i = 0; i < s->rows; i++) {
161 set_pos(s, i, col, 0);
166 set_pos(s, i, col, map_1bit[b]);
171 static int k24(InterplayACMContext *s, unsigned ind, unsigned col)
173 GetBitContext *gb = &s->gb;
176 for (i = 0; i < s->rows; i++) {
179 set_pos(s, i++, col, 0);
180 if (i >= s->rows) break;
181 set_pos(s, i, col, 0);
187 set_pos(s, i, col, 0);
192 set_pos(s, i, col, map_2bit_near[b]);
197 static int k23(InterplayACMContext *s, unsigned ind, unsigned col)
199 GetBitContext *gb = &s->gb;
202 for (i = 0; i < s->rows; i++) {
205 set_pos(s, i, col, 0);
210 set_pos(s, i, col, map_2bit_near[b]);
215 static int k35(InterplayACMContext *s, unsigned ind, unsigned col)
217 GetBitContext *gb = &s->gb;
220 for (i = 0; i < s->rows; i++) {
223 set_pos(s, i++, col, 0);
226 set_pos(s, i, col, 0);
232 set_pos(s, i, col, 0);
239 set_pos(s, i, col, map_1bit[b]);
244 set_pos(s, i, col, map_2bit_far[b]);
249 static int k34(InterplayACMContext *s, unsigned ind, unsigned col)
251 GetBitContext *gb = &s->gb;
254 for (i = 0; i < s->rows; i++) {
257 set_pos(s, i, col, 0);
264 set_pos(s, i, col, map_1bit[b]);
269 set_pos(s, i, col, map_2bit_far[b]);
274 static int k45(InterplayACMContext *s, unsigned ind, unsigned col)
276 GetBitContext *gb = &s->gb;
279 for (i = 0; i < s->rows; i++) {
282 set_pos(s, i, col, 0); i++;
285 set_pos(s, i, col, 0);
291 set_pos(s, i, col, 0);
296 set_pos(s, i, col, map_3bit[b]);
301 static int k44(InterplayACMContext *s, unsigned ind, unsigned col)
303 GetBitContext *gb = &s->gb;
306 for (i = 0; i < s->rows; i++) {
309 set_pos(s, i, col, 0);
314 set_pos(s, i, col, map_3bit[b]);
319 static int t15(InterplayACMContext *s, unsigned ind, unsigned col)
321 GetBitContext *gb = &s->gb;
325 for (i = 0; i < s->rows; i++) {
326 /* b = (x1) + (x2 * 3) + (x3 * 9) */
329 n1 = (mul_3x3[b] & 0x0F) - 1;
330 n2 = ((mul_3x3[b] >> 4) & 0x0F) - 1;
331 n3 = ((mul_3x3[b] >> 8) & 0x0F) - 1;
333 set_pos(s, i++, col, n1);
336 set_pos(s, i++, col, n2);
339 set_pos(s, i, col, n3);
344 static int t27(InterplayACMContext *s, unsigned ind, unsigned col)
346 GetBitContext *gb = &s->gb;
350 for (i = 0; i < s->rows; i++) {
351 /* b = (x1) + (x2 * 5) + (x3 * 25) */
354 n1 = (mul_3x5[b] & 0x0F) - 2;
355 n2 = ((mul_3x5[b] >> 4) & 0x0F) - 2;
356 n3 = ((mul_3x5[b] >> 8) & 0x0F) - 2;
358 set_pos(s, i++, col, n1);
361 set_pos(s, i++, col, n2);
364 set_pos(s, i, col, n3);
369 static int t37(InterplayACMContext *s, unsigned ind, unsigned col)
371 GetBitContext *gb = &s->gb;
374 for (i = 0; i < s->rows; i++) {
375 /* b = (x1) + (x2 * 11) */
378 n1 = (mul_2x11[b] & 0x0F) - 5;
379 n2 = ((mul_2x11[b] >> 4) & 0x0F) - 5;
381 set_pos(s, i++, col, n1);
384 set_pos(s, i, col, n2);
389 typedef int (*filler)(InterplayACMContext *s, unsigned ind, unsigned col);
391 static const filler filler_list[] = {
392 zero, bad, bad, linear,
393 linear, linear, linear, linear,
394 linear, linear, linear, linear,
395 linear, linear, linear, linear,
396 linear, k13, k12, t15,
402 static int fill_block(InterplayACMContext *s)
404 GetBitContext *gb = &s->gb;
408 for (i = 0; i < s->cols; i++) {
409 ind = get_bits(gb, 5);
410 ret = filler_list[ind](s, ind, i);
417 static void juggle(int *wrap_p, int *block_p, unsigned sub_len, unsigned sub_count)
420 int *p, r0, r1, r2, r3;
422 for (i = 0; i < sub_len; i++) {
426 for (j = 0; j < sub_count/2; j++) {
428 *p = r1 * 2 + (r0 + r2);
431 *p = r2 * 2 - (r1 + r3);
443 static void juggle_block(InterplayACMContext *s)
445 unsigned sub_count, sub_len, todo_count, step_subcount, i;
446 int *wrap_p, *block_p, *p;
448 /* juggle only if subblock_len > 1 */
452 /* 2048 / subblock_len */
456 step_subcount = (2048 >> s->level) - 2;
458 /* Apply juggle() (rows)x(cols)
459 * from (step_subcount * 2) x (subblock_len/2)
460 * to (step_subcount * subblock_len) x (1)
462 todo_count = s->rows;
466 sub_count = step_subcount;
467 if (sub_count > todo_count)
468 sub_count = todo_count;
470 sub_len = s->cols / 2;
473 juggle(wrap_p, block_p, sub_len, sub_count);
474 wrap_p += sub_len * 2;
476 for (i = 0, p = block_p; i < sub_count; i++) {
481 while (sub_len > 1) {
484 juggle(wrap_p, block_p, sub_len, sub_count);
485 wrap_p += sub_len * 2;
488 if (todo_count <= step_subcount)
491 todo_count -= step_subcount;
492 block_p += step_subcount << s->level;
496 static int decode_block(InterplayACMContext *s)
498 GetBitContext *gb = &s->gb;
499 int pwr, count, val, i, x, ret;
501 pwr = get_bits(gb, 4);
502 val = get_bits(gb, 16);
506 for (i = 0, x = 0; i < count; i++) {
511 for (i = 1, x = -val; i <= count; i++) {
525 static int decode_frame(AVCodecContext *avctx, void *data,
526 int *got_frame_ptr, AVPacket *pkt)
528 InterplayACMContext *s = avctx->priv_data;
529 GetBitContext *gb = &s->gb;
530 AVFrame *frame = data;
533 int ret, n, buf_size, input_buf_size;
535 if (!pkt->size && !s->bitstream_size) {
540 buf_size = FFMIN(pkt->size, s->max_framesize - s->bitstream_size);
541 input_buf_size = buf_size;
542 if (s->bitstream_index + s->bitstream_size + buf_size > s->max_framesize) {
543 memmove(s->bitstream, &s->bitstream[s->bitstream_index], s->bitstream_size);
544 s->bitstream_index = 0;
547 memcpy(&s->bitstream[s->bitstream_index + s->bitstream_size], pkt->data, buf_size);
548 buf = &s->bitstream[s->bitstream_index];
549 buf_size += s->bitstream_size;
550 s->bitstream_size = buf_size;
551 if (buf_size < s->max_framesize && pkt->data) {
553 return input_buf_size;
556 if ((ret = init_get_bits8(gb, buf, buf_size)) < 0)
559 frame->nb_samples = s->block_len / avctx->channels;
560 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
563 skip_bits(gb, s->skip);
564 ret = decode_block(s);
568 samples = (int16_t *)frame->data[0];
569 for (n = 0; n < frame->nb_samples * avctx->channels; n++) {
570 int val = s->block[n] >> s->level;
575 s->skip = get_bits_count(gb) - 8 * (get_bits_count(gb) / 8);
576 n = get_bits_count(gb) / 8;
578 if (n > buf_size && pkt->data) {
579 s->bitstream_size = 0;
580 s->bitstream_index = 0;
581 return AVERROR_INVALIDDATA;
584 if (s->bitstream_size) {
585 s->bitstream_index += n;
586 s->bitstream_size -= n;
587 return input_buf_size;
592 static av_cold int decode_close(AVCodecContext *avctx)
594 InterplayACMContext *s = avctx->priv_data;
597 av_freep(&s->wrapbuf);
598 av_freep(&s->ampbuf);
599 av_freep(&s->bitstream);
600 s->bitstream_size = 0;
605 AVCodec ff_interplay_acm_decoder = {
606 .name = "interplayacm",
607 .long_name = NULL_IF_CONFIG_SMALL("Interplay ACM"),
608 .type = AVMEDIA_TYPE_AUDIO,
609 .id = AV_CODEC_ID_INTERPLAY_ACM,
611 .close = decode_close,
612 .decode = decode_frame,
613 .capabilities = AV_CODEC_CAP_DELAY | AV_CODEC_CAP_DR1,
614 .priv_data_size = sizeof(InterplayACMContext),