FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/dpcm.c
Date: 2025-07-11 09:13:03
Exec Total Coverage
Lines: 104 205 50.7%
Functions: 2 3 66.7%
Branches: 43 96 44.8%
Line Branch Exec Source
1 /*
2 * Assorted DPCM codecs
3 * Copyright (c) 2003 The FFmpeg project
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 /**
23 * @file
24 * Assorted DPCM (differential pulse code modulation) audio codecs
25 * by Mike Melanson (melanson@pcisys.net)
26 * Xan DPCM decoder by Mario Brito (mbrito@student.dei.uc.pt)
27 * for more information on the specific data formats, visit:
28 * http://www.pcisys.net/~melanson/codecs/simpleaudio.html
29 * SOL DPCMs implemented by Konstantin Shishkov
30 *
31 * Note about using the Xan DPCM decoder: Xan DPCM is used in AVI files
32 * found in the Wing Commander IV computer game. These AVI files contain
33 * WAVEFORMAT headers which report the audio format as 0x01: raw PCM.
34 * Clearly incorrect. To detect Xan DPCM, you will probably have to
35 * special-case your AVI demuxer to use Xan DPCM if the file uses 'Xxan'
36 * (Xan video) for its video codec. Alternately, such AVI files also contain
37 * the fourcc 'Axan' in the 'auds' chunk of the AVI header.
38 */
39
40 #include "avcodec.h"
41 #include "bytestream.h"
42 #include "codec_internal.h"
43 #include "decode.h"
44 #include "mathops.h"
45
46 typedef struct DPCMContext {
47 int16_t array[256];
48 int sample[2]; ///< previous sample (for SOL_DPCM and WADY_DPCM)
49 int scale; ///< scale for WADY_DPCM
50 const int8_t *sol_table; ///< delta table for SOL_DPCM
51 } DPCMContext;
52
53 static const int32_t derf_steps[96] = {
54 0, 1, 2, 3, 4, 5, 6, 7,
55 8, 9, 10, 11, 12, 13, 14, 16,
56 17, 19, 21, 23, 25, 28, 31, 34,
57 37, 41, 45, 50, 55, 60, 66, 73,
58 80, 88, 97, 107, 118, 130, 143, 157,
59 173, 190, 209, 230, 253, 279, 307, 337,
60 371, 408, 449, 494, 544, 598, 658, 724,
61 796, 876, 963, 1060, 1166, 1282, 1411, 1552,
62 1707, 1878, 2066, 2272, 2499, 2749, 3024, 3327,
63 3660, 4026, 4428, 4871, 5358, 5894, 6484, 7132,
64 7845, 8630, 9493, 10442, 11487, 12635, 13899, 15289,
65 16818, 18500, 20350, 22385, 24623, 27086, 29794, 32767,
66 };
67
68 static const int16_t interplay_delta_table[] = {
69 0, 1, 2, 3, 4, 5, 6, 7,
70 8, 9, 10, 11, 12, 13, 14, 15,
71 16, 17, 18, 19, 20, 21, 22, 23,
72 24, 25, 26, 27, 28, 29, 30, 31,
73 32, 33, 34, 35, 36, 37, 38, 39,
74 40, 41, 42, 43, 47, 51, 56, 61,
75 66, 72, 79, 86, 94, 102, 112, 122,
76 133, 145, 158, 173, 189, 206, 225, 245,
77 267, 292, 318, 348, 379, 414, 452, 493,
78 538, 587, 640, 699, 763, 832, 908, 991,
79 1081, 1180, 1288, 1405, 1534, 1673, 1826, 1993,
80 2175, 2373, 2590, 2826, 3084, 3365, 3672, 4008,
81 4373, 4772, 5208, 5683, 6202, 6767, 7385, 8059,
82 8794, 9597, 10472, 11428, 12471, 13609, 14851, 16206,
83 17685, 19298, 21060, 22981, 25078, 27367, 29864, 32589,
84 -29973, -26728, -23186, -19322, -15105, -10503, -5481, -1,
85 1, 1, 5481, 10503, 15105, 19322, 23186, 26728,
86 29973, -32589, -29864, -27367, -25078, -22981, -21060, -19298,
87 -17685, -16206, -14851, -13609, -12471, -11428, -10472, -9597,
88 -8794, -8059, -7385, -6767, -6202, -5683, -5208, -4772,
89 -4373, -4008, -3672, -3365, -3084, -2826, -2590, -2373,
90 -2175, -1993, -1826, -1673, -1534, -1405, -1288, -1180,
91 -1081, -991, -908, -832, -763, -699, -640, -587,
92 -538, -493, -452, -414, -379, -348, -318, -292,
93 -267, -245, -225, -206, -189, -173, -158, -145,
94 -133, -122, -112, -102, -94, -86, -79, -72,
95 -66, -61, -56, -51, -47, -43, -42, -41,
96 -40, -39, -38, -37, -36, -35, -34, -33,
97 -32, -31, -30, -29, -28, -27, -26, -25,
98 -24, -23, -22, -21, -20, -19, -18, -17,
99 -16, -15, -14, -13, -12, -11, -10, -9,
100 -8, -7, -6, -5, -4, -3, -2, -1
101
102 };
103
104 static const int8_t sol_table_old[16] = {
105 0x0, 0x1, 0x2, 0x3, 0x6, 0xA, 0xF, 0x15,
106 -0x15, -0xF, -0xA, -0x6, -0x3, -0x2, -0x1, 0x0
107 };
108
109 static const int8_t sol_table_new[16] = {
110 0x0, 0x1, 0x2, 0x3, 0x6, 0xA, 0xF, 0x15,
111 0x0, -0x1, -0x2, -0x3, -0x6, -0xA, -0xF, -0x15
112 };
113
114 static const int16_t sol_table_16[128] = {
115 0x000, 0x008, 0x010, 0x020, 0x030, 0x040, 0x050, 0x060, 0x070, 0x080,
116 0x090, 0x0A0, 0x0B0, 0x0C0, 0x0D0, 0x0E0, 0x0F0, 0x100, 0x110, 0x120,
117 0x130, 0x140, 0x150, 0x160, 0x170, 0x180, 0x190, 0x1A0, 0x1B0, 0x1C0,
118 0x1D0, 0x1E0, 0x1F0, 0x200, 0x208, 0x210, 0x218, 0x220, 0x228, 0x230,
119 0x238, 0x240, 0x248, 0x250, 0x258, 0x260, 0x268, 0x270, 0x278, 0x280,
120 0x288, 0x290, 0x298, 0x2A0, 0x2A8, 0x2B0, 0x2B8, 0x2C0, 0x2C8, 0x2D0,
121 0x2D8, 0x2E0, 0x2E8, 0x2F0, 0x2F8, 0x300, 0x308, 0x310, 0x318, 0x320,
122 0x328, 0x330, 0x338, 0x340, 0x348, 0x350, 0x358, 0x360, 0x368, 0x370,
123 0x378, 0x380, 0x388, 0x390, 0x398, 0x3A0, 0x3A8, 0x3B0, 0x3B8, 0x3C0,
124 0x3C8, 0x3D0, 0x3D8, 0x3E0, 0x3E8, 0x3F0, 0x3F8, 0x400, 0x440, 0x480,
125 0x4C0, 0x500, 0x540, 0x580, 0x5C0, 0x600, 0x640, 0x680, 0x6C0, 0x700,
126 0x740, 0x780, 0x7C0, 0x800, 0x900, 0xA00, 0xB00, 0xC00, 0xD00, 0xE00,
127 0xF00, 0x1000, 0x1400, 0x1800, 0x1C00, 0x2000, 0x3000, 0x4000
128 };
129
130 static const int16_t wady_table[128] = {
131 0, 2, 4, 6, 8, 10, 12, 15,
132 18, 21, 24, 28, 32, 36, 40, 44,
133 49, 54, 59, 64, 70, 76, 82, 88,
134 95, 102, 109, 116, 124, 132, 140, 148,
135 160, 170, 180, 190, 200, 210, 220, 230,
136 240, 255, 270, 285, 300, 320, 340, 360,
137 380, 400, 425, 450, 475, 500, 525, 550,
138 580, 610, 650, 700, 750, 800, 900, 1000,
139 -0, -2, -4, -6, -8, -10, -12, -15,
140 -18, -21, -24, -28, -32, -36, -40, -44,
141 -49, -54, -59, -64, -70, -76, -82, -88,
142 -95, -102,-109,-116,-124,-132,-140,-148,
143 -160,-170,-180,-190,-200,-210,-220,-230,
144 -240,-255,-270,-285,-300,-320,-340,-360,
145 -380,-400,-425,-450,-475,-500,-525,-550,
146 -580,-610,-650,-700,-750,-800,-900,-1000,
147 };
148
149 14 static av_cold int dpcm_decode_init(AVCodecContext *avctx)
150 {
151 14 DPCMContext *s = avctx->priv_data;
152 int i;
153
154
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 14 if (avctx->ch_layout.nb_channels < 1 || avctx->ch_layout.nb_channels > 2) {
155 ✗ av_log(avctx, AV_LOG_ERROR, "invalid number of channels\n");
156 ✗ return AVERROR(EINVAL);
157 }
158
159 14 s->sample[0] = s->sample[1] = 0;
160
161
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 14 switch (avctx->codec->id) {
162
163 5 case AV_CODEC_ID_ROQ_DPCM:
164 /* initialize square table */
165
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 645 for (i = 0; i < 128; i++) {
166 640 int16_t square = i * i;
167 640 s->array[i ] = square;
168 640 s->array[i + 128] = -square;
169 }
170 5 break;
171
172 2 case AV_CODEC_ID_SOL_DPCM:
173
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 2 switch(avctx->codec_tag){
174 ✗ case 1:
175 ✗ s->sol_table = sol_table_old;
176 ✗ s->sample[0] = s->sample[1] = 0x80;
177 ✗ break;
178 ✗ case 2:
179 ✗ s->sol_table = sol_table_new;
180 ✗ s->sample[0] = s->sample[1] = 0x80;
181 ✗ break;
182 2 case 3:
183 2 break;
184 ✗ default:
185 ✗ av_log(avctx, AV_LOG_ERROR, "Unknown SOL subcodec\n");
186 ✗ return -1;
187 }
188 2 break;
189
190 ✗ case AV_CODEC_ID_SDX2_DPCM:
191 ✗ for (i = -128; i < 128; i++) {
192 ✗ int16_t square = i * i * 2;
193 ✗ s->array[i+128] = i < 0 ? -square: square;
194 }
195 ✗ break;
196
197 ✗ case AV_CODEC_ID_CBD2_DPCM:
198 ✗ for (i = -128; i < 128; i++) {
199 ✗ int16_t cube = (i * i * i) / 64;
200 ✗ s->array[i+128] = cube;
201 }
202 ✗ break;
203
204 ✗ case AV_CODEC_ID_GREMLIN_DPCM: {
205 ✗ int delta = 0;
206 ✗ int code = 64;
207 ✗ int step = 45;
208
209 ✗ s->array[0] = 0;
210 ✗ for (i = 0; i < 127; i++) {
211 ✗ delta += (code >> 5);
212 ✗ code += step;
213 ✗ step += 2;
214
215 ✗ s->array[i*2 + 1] = delta;
216 ✗ s->array[i*2 + 2] = -delta;
217 }
218 ✗ s->array[255] = delta + (code >> 5);
219 }
220 ✗ break;
221
222 ✗ case AV_CODEC_ID_WADY_DPCM:
223 ✗ s->scale = (avctx->extradata && avctx->extradata_size > 0) ? avctx->extradata[0] : 1;
224 ✗ break;
225
226 7 default:
227 7 break;
228 }
229
230
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 14 if (avctx->codec->id == AV_CODEC_ID_SOL_DPCM && avctx->codec_tag != 3)
231 ✗ avctx->sample_fmt = AV_SAMPLE_FMT_U8;
232 else
233 14 avctx->sample_fmt = AV_SAMPLE_FMT_S16;
234
235 14 return 0;
236 }
237
238
239 649 static int dpcm_decode_frame(AVCodecContext *avctx, AVFrame *frame,
240 int *got_frame_ptr, AVPacket *avpkt)
241 {
242 649 int buf_size = avpkt->size;
243 649 DPCMContext *s = avctx->priv_data;
244 649 int out = 0, ret;
245 int predictor[2];
246 649 int ch = 0;
247 649 int stereo = avctx->ch_layout.nb_channels - 1;
248 int16_t *output_samples, *samples_end;
249 GetByteContext gb;
250
251
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 649 if (stereo && (buf_size & 1))
252 ✗ buf_size--;
253 649 bytestream2_init(&gb, avpkt->data, buf_size);
254
255 /* calculate output size */
256
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 649 switch(avctx->codec->id) {
257 340 case AV_CODEC_ID_ROQ_DPCM:
258 340 out = buf_size - 8;
259 340 break;
260 124 case AV_CODEC_ID_INTERPLAY_DPCM:
261 124 out = buf_size - 6 - avctx->ch_layout.nb_channels;
262 124 break;
263 111 case AV_CODEC_ID_XAN_DPCM:
264 111 out = buf_size - 2 * avctx->ch_layout.nb_channels;
265 111 break;
266 74 case AV_CODEC_ID_SOL_DPCM:
267
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 74 if (avctx->codec_tag != 3)
268 ✗ out = buf_size * 2;
269 else
270 74 out = buf_size;
271 74 break;
272 ✗ case AV_CODEC_ID_WADY_DPCM:
273 case AV_CODEC_ID_DERF_DPCM:
274 case AV_CODEC_ID_GREMLIN_DPCM:
275 case AV_CODEC_ID_CBD2_DPCM:
276 case AV_CODEC_ID_SDX2_DPCM:
277 ✗ out = buf_size;
278 ✗ break;
279 }
280
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 649 if (out <= 0) {
281 ✗ av_log(avctx, AV_LOG_ERROR, "packet is too small\n");
282 ✗ return AVERROR(EINVAL);
283 }
284
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 649 if (out % avctx->ch_layout.nb_channels) {
285 ✗ av_log(avctx, AV_LOG_WARNING, "channels have differing number of samples\n");
286 }
287
288 /* get output buffer */
289 649 frame->nb_samples = (out + avctx->ch_layout.nb_channels - 1) / avctx->ch_layout.nb_channels;
290
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 649 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
291 ✗ return ret;
292 649 output_samples = (int16_t *)frame->data[0];
293 649 samples_end = output_samples + out;
294
295
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 649 switch(avctx->codec->id) {
296
297 340 case AV_CODEC_ID_ROQ_DPCM:
298 340 bytestream2_skipu(&gb, 6);
299
300
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 340 if (stereo) {
301 340 predictor[1] = sign_extend(bytestream2_get_byteu(&gb) << 8, 16);
302 340 predictor[0] = sign_extend(bytestream2_get_byteu(&gb) << 8, 16);
303 } else {
304 ✗ predictor[0] = sign_extend(bytestream2_get_le16u(&gb), 16);
305 }
306
307 /* decode the samples */
308
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 523240 while (output_samples < samples_end) {
309 522900 predictor[ch] += s->array[bytestream2_get_byteu(&gb)];
310 522900 predictor[ch] = av_clip_int16(predictor[ch]);
311 522900 *output_samples++ = predictor[ch];
312
313 /* toggle channel */
314 522900 ch ^= stereo;
315 }
316 340 break;
317
318 124 case AV_CODEC_ID_INTERPLAY_DPCM:
319 124 bytestream2_skipu(&gb, 6); /* skip over the stream mask and stream length */
320
321
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 372 for (ch = 0; ch < avctx->ch_layout.nb_channels; ch++) {
322 248 predictor[ch] = sign_extend(bytestream2_get_le16u(&gb), 16);
323 248 *output_samples++ = predictor[ch];
324 }
325
326 124 ch = 0;
327
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 364752 while (output_samples < samples_end) {
328 364628 predictor[ch] += interplay_delta_table[bytestream2_get_byteu(&gb)];
329 364628 predictor[ch] = av_clip_int16(predictor[ch]);
330 364628 *output_samples++ = predictor[ch];
331
332 /* toggle channel */
333 364628 ch ^= stereo;
334 }
335 124 break;
336
337 111 case AV_CODEC_ID_XAN_DPCM:
338 {
339 111 int shift[2] = { 4, 4 };
340
341
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 333 for (ch = 0; ch < avctx->ch_layout.nb_channels; ch++)
342 222 predictor[ch] = sign_extend(bytestream2_get_le16u(&gb), 16);
343
344 111 ch = 0;
345
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 326229 while (output_samples < samples_end) {
346 326118 int diff = bytestream2_get_byteu(&gb);
347 326118 int n = diff & 3;
348
349
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 326118 if (n == 3)
350 134940 shift[ch]++;
351 else
352 191178 shift[ch] -= (2 * n);
353 326118 diff = sign_extend((diff &~ 3) << 8, 16);
354
355 /* saturate the shifter to 0..31 */
356 326118 shift[ch] = av_clip_uintp2(shift[ch], 5);
357
358 326118 diff >>= shift[ch];
359 326118 predictor[ch] += diff;
360
361 326118 predictor[ch] = av_clip_int16(predictor[ch]);
362 326118 *output_samples++ = predictor[ch];
363
364 /* toggle channel */
365 326118 ch ^= stereo;
366 }
367 111 break;
368 }
369 74 case AV_CODEC_ID_SOL_DPCM:
370
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 74 if (avctx->codec_tag != 3) {
371 ✗ uint8_t *output_samples_u8 = frame->data[0],
372 ✗ *samples_end_u8 = output_samples_u8 + out;
373 ✗ while (output_samples_u8 < samples_end_u8) {
374 ✗ int n = bytestream2_get_byteu(&gb);
375
376 ✗ s->sample[0] += s->sol_table[n >> 4];
377 ✗ s->sample[0] = av_clip_uint8(s->sample[0]);
378 ✗ *output_samples_u8++ = s->sample[0];
379
380 ✗ s->sample[stereo] += s->sol_table[n & 0x0F];
381 ✗ s->sample[stereo] = av_clip_uint8(s->sample[stereo]);
382 ✗ *output_samples_u8++ = s->sample[stereo];
383 }
384 } else {
385
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 299512 while (output_samples < samples_end) {
386 299438 int n = bytestream2_get_byteu(&gb);
387
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 299438 if (n & 0x80) s->sample[ch] -= sol_table_16[n & 0x7F];
388 150564 else s->sample[ch] += sol_table_16[n & 0x7F];
389 299438 s->sample[ch] = av_clip_int16(s->sample[ch]);
390 299438 *output_samples++ = s->sample[ch];
391 /* toggle channel */
392 299438 ch ^= stereo;
393 }
394 }
395 74 break;
396
397 ✗ case AV_CODEC_ID_CBD2_DPCM:
398 case AV_CODEC_ID_SDX2_DPCM:
399 ✗ while (output_samples < samples_end) {
400 ✗ int8_t n = bytestream2_get_byteu(&gb);
401
402 ✗ if (!(n & 1))
403 ✗ s->sample[ch] = 0;
404 ✗ s->sample[ch] += s->array[n + 128];
405 ✗ s->sample[ch] = av_clip_int16(s->sample[ch]);
406 ✗ *output_samples++ = s->sample[ch];
407 ✗ ch ^= stereo;
408 }
409 ✗ break;
410
411 ✗ case AV_CODEC_ID_GREMLIN_DPCM: {
412 ✗ int idx = 0;
413
414 ✗ while (output_samples < samples_end) {
415 ✗ uint8_t n = bytestream2_get_byteu(&gb);
416
417 ✗ *output_samples++ = s->sample[idx] += (unsigned)s->array[n];
418 ✗ idx ^= 1;
419 }
420 }
421 ✗ break;
422
423 ✗ case AV_CODEC_ID_DERF_DPCM: {
424 ✗ int idx = 0;
425
426 ✗ while (output_samples < samples_end) {
427 ✗ uint8_t n = bytestream2_get_byteu(&gb);
428 ✗ int index = FFMIN(n & 0x7f, 95);
429
430 ✗ s->sample[idx] += (n & 0x80 ? -1: 1) * derf_steps[index];
431 ✗ s->sample[idx] = av_clip_int16(s->sample[idx]);
432 ✗ *output_samples++ = s->sample[idx];
433 ✗ idx ^= stereo;
434 }
435 }
436 ✗ break;
437
438 ✗ case AV_CODEC_ID_WADY_DPCM: {
439 ✗ int idx = 0;
440
441 ✗ while (output_samples < samples_end) {
442 ✗ const uint8_t n = bytestream2_get_byteu(&gb);
443
444 ✗ if (n & 0x80)
445 ✗ s->sample[idx] = sign_extend((n & 0x7f) << 9, 16);
446 else
447 ✗ s->sample[idx] += s->scale * (unsigned)wady_table[n & 0x7f];
448 ✗ *output_samples++ = av_clip_int16(s->sample[idx]);
449 ✗ idx ^= stereo;
450 }
451 }
452 ✗ break;
453 }
454
455 649 *got_frame_ptr = 1;
456
457 649 return avpkt->size;
458 }
459
460 ✗ static void dpcm_flush(AVCodecContext *avctx)
461 {
462 ✗ DPCMContext *s = avctx->priv_data;
463
464 ✗ s->sample[0] = s->sample[1] = 0;
465 ✗ }
466
467 #define DPCM_DECODER(id_, name_, long_name_) \
468 const FFCodec ff_ ## name_ ## _decoder = { \
469 .p.name = #name_, \
470 CODEC_LONG_NAME(long_name_), \
471 .p.type = AVMEDIA_TYPE_AUDIO, \
472 .p.id = id_, \
473 .p.capabilities = AV_CODEC_CAP_DR1, \
474 .priv_data_size = sizeof(DPCMContext), \
475 .init = dpcm_decode_init, \
476 .flush = dpcm_flush, \
477 FF_CODEC_DECODE_CB(dpcm_decode_frame), \
478 }
479
480 DPCM_DECODER(AV_CODEC_ID_CBD2_DPCM, cbd2_dpcm, "DPCM Cuberoot-Delta-Exact");
481 DPCM_DECODER(AV_CODEC_ID_DERF_DPCM, derf_dpcm, "DPCM Xilam DERF");
482 DPCM_DECODER(AV_CODEC_ID_GREMLIN_DPCM, gremlin_dpcm, "DPCM Gremlin");
483 DPCM_DECODER(AV_CODEC_ID_INTERPLAY_DPCM, interplay_dpcm, "DPCM Interplay");
484 DPCM_DECODER(AV_CODEC_ID_ROQ_DPCM, roq_dpcm, "DPCM id RoQ");
485 DPCM_DECODER(AV_CODEC_ID_SDX2_DPCM, sdx2_dpcm, "DPCM Squareroot-Delta-Exact");
486 DPCM_DECODER(AV_CODEC_ID_SOL_DPCM, sol_dpcm, "DPCM Sol");
487 DPCM_DECODER(AV_CODEC_ID_XAN_DPCM, xan_dpcm, "DPCM Xan");
488 DPCM_DECODER(AV_CODEC_ID_WADY_DPCM, wady_dpcm, "DPCM Marble WADY");
489