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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 "libavutil/intreadwrite.h" | |
41 | #include "avcodec.h" | |
42 | #include "bytestream.h" | |
43 | #include "internal.h" | |
44 | #include "mathops.h" | |
45 | ||
46 | typedef struct DPCMContext { | |
47 | int16_t roq_square_array[256]; | |
48 | int sample[2]; ///< previous sample (for SOL_DPCM) | |
49 | const int8_t *sol_table; ///< delta table for SOL_DPCM | |
50 | } DPCMContext; | |
51 | ||
52 | static const int16_t interplay_delta_table[] = { | |
53 | 0, 1, 2, 3, 4, 5, 6, 7, | |
54 | 8, 9, 10, 11, 12, 13, 14, 15, | |
55 | 16, 17, 18, 19, 20, 21, 22, 23, | |
56 | 24, 25, 26, 27, 28, 29, 30, 31, | |
57 | 32, 33, 34, 35, 36, 37, 38, 39, | |
58 | 40, 41, 42, 43, 47, 51, 56, 61, | |
59 | 66, 72, 79, 86, 94, 102, 112, 122, | |
60 | 133, 145, 158, 173, 189, 206, 225, 245, | |
61 | 267, 292, 318, 348, 379, 414, 452, 493, | |
62 | 538, 587, 640, 699, 763, 832, 908, 991, | |
63 | 1081, 1180, 1288, 1405, 1534, 1673, 1826, 1993, | |
64 | 2175, 2373, 2590, 2826, 3084, 3365, 3672, 4008, | |
65 | 4373, 4772, 5208, 5683, 6202, 6767, 7385, 8059, | |
66 | 8794, 9597, 10472, 11428, 12471, 13609, 14851, 16206, | |
67 | 17685, 19298, 21060, 22981, 25078, 27367, 29864, 32589, | |
68 | -29973, -26728, -23186, -19322, -15105, -10503, -5481, -1, | |
69 | 1, 1, 5481, 10503, 15105, 19322, 23186, 26728, | |
70 | 29973, -32589, -29864, -27367, -25078, -22981, -21060, -19298, | |
71 | -17685, -16206, -14851, -13609, -12471, -11428, -10472, -9597, | |
72 | -8794, -8059, -7385, -6767, -6202, -5683, -5208, -4772, | |
73 | -4373, -4008, -3672, -3365, -3084, -2826, -2590, -2373, | |
74 | -2175, -1993, -1826, -1673, -1534, -1405, -1288, -1180, | |
75 | -1081, -991, -908, -832, -763, -699, -640, -587, | |
76 | -538, -493, -452, -414, -379, -348, -318, -292, | |
77 | -267, -245, -225, -206, -189, -173, -158, -145, | |
78 | -133, -122, -112, -102, -94, -86, -79, -72, | |
79 | -66, -61, -56, -51, -47, -43, -42, -41, | |
80 | -40, -39, -38, -37, -36, -35, -34, -33, | |
81 | -32, -31, -30, -29, -28, -27, -26, -25, | |
82 | -24, -23, -22, -21, -20, -19, -18, -17, | |
83 | -16, -15, -14, -13, -12, -11, -10, -9, | |
84 | -8, -7, -6, -5, -4, -3, -2, -1 | |
85 | ||
86 | }; | |
87 | ||
88 | static const int8_t sol_table_old[16] = { | |
89 | 0x0, 0x1, 0x2, 0x3, 0x6, 0xA, 0xF, 0x15, | |
90 | -0x15, -0xF, -0xA, -0x6, -0x3, -0x2, -0x1, 0x0 | |
91 | }; | |
92 | ||
93 | static const int8_t sol_table_new[16] = { | |
94 | 0x0, 0x1, 0x2, 0x3, 0x6, 0xA, 0xF, 0x15, | |
95 | 0x0, -0x1, -0x2, -0x3, -0x6, -0xA, -0xF, -0x15 | |
96 | }; | |
97 | ||
98 | static const int16_t sol_table_16[128] = { | |
99 | 0x000, 0x008, 0x010, 0x020, 0x030, 0x040, 0x050, 0x060, 0x070, 0x080, | |
100 | 0x090, 0x0A0, 0x0B0, 0x0C0, 0x0D0, 0x0E0, 0x0F0, 0x100, 0x110, 0x120, | |
101 | 0x130, 0x140, 0x150, 0x160, 0x170, 0x180, 0x190, 0x1A0, 0x1B0, 0x1C0, | |
102 | 0x1D0, 0x1E0, 0x1F0, 0x200, 0x208, 0x210, 0x218, 0x220, 0x228, 0x230, | |
103 | 0x238, 0x240, 0x248, 0x250, 0x258, 0x260, 0x268, 0x270, 0x278, 0x280, | |
104 | 0x288, 0x290, 0x298, 0x2A0, 0x2A8, 0x2B0, 0x2B8, 0x2C0, 0x2C8, 0x2D0, | |
105 | 0x2D8, 0x2E0, 0x2E8, 0x2F0, 0x2F8, 0x300, 0x308, 0x310, 0x318, 0x320, | |
106 | 0x328, 0x330, 0x338, 0x340, 0x348, 0x350, 0x358, 0x360, 0x368, 0x370, | |
107 | 0x378, 0x380, 0x388, 0x390, 0x398, 0x3A0, 0x3A8, 0x3B0, 0x3B8, 0x3C0, | |
108 | 0x3C8, 0x3D0, 0x3D8, 0x3E0, 0x3E8, 0x3F0, 0x3F8, 0x400, 0x440, 0x480, | |
109 | 0x4C0, 0x500, 0x540, 0x580, 0x5C0, 0x600, 0x640, 0x680, 0x6C0, 0x700, | |
110 | 0x740, 0x780, 0x7C0, 0x800, 0x900, 0xA00, 0xB00, 0xC00, 0xD00, 0xE00, | |
111 | 0xF00, 0x1000, 0x1400, 0x1800, 0x1C00, 0x2000, 0x3000, 0x4000 | |
112 | }; | |
113 | ||
114 | ||
115 | static av_cold int dpcm_decode_init(AVCodecContext *avctx) | |
116 | { | |
117 | DPCMContext *s = avctx->priv_data; | |
118 | int i; | |
119 | ||
120 | if (avctx->channels < 1 || avctx->channels > 2) { | |
121 | av_log(avctx, AV_LOG_ERROR, "invalid number of channels\n"); | |
122 | return AVERROR(EINVAL); | |
123 | } | |
124 | ||
125 | s->sample[0] = s->sample[1] = 0; | |
126 | ||
127 | switch(avctx->codec->id) { | |
128 | ||
129 | case AV_CODEC_ID_ROQ_DPCM: | |
130 | /* initialize square table */ | |
131 | for (i = 0; i < 128; i++) { | |
132 | int16_t square = i * i; | |
133 | s->roq_square_array[i ] = square; | |
134 | s->roq_square_array[i + 128] = -square; | |
135 | } | |
136 | break; | |
137 | ||
138 | case AV_CODEC_ID_SOL_DPCM: | |
139 | switch(avctx->codec_tag){ | |
140 | case 1: | |
141 | s->sol_table = sol_table_old; | |
142 | s->sample[0] = s->sample[1] = 0x80; | |
143 | break; | |
144 | case 2: | |
145 | s->sol_table = sol_table_new; | |
146 | s->sample[0] = s->sample[1] = 0x80; | |
147 | break; | |
148 | case 3: | |
149 | break; | |
150 | default: | |
151 | av_log(avctx, AV_LOG_ERROR, "Unknown SOL subcodec\n"); | |
152 | return -1; | |
153 | } | |
154 | break; | |
155 | ||
156 | default: | |
157 | break; | |
158 | } | |
159 | ||
160 | if (avctx->codec->id == AV_CODEC_ID_SOL_DPCM && avctx->codec_tag != 3) | |
161 | avctx->sample_fmt = AV_SAMPLE_FMT_U8; | |
162 | else | |
163 | avctx->sample_fmt = AV_SAMPLE_FMT_S16; | |
164 | ||
165 | return 0; | |
166 | } | |
167 | ||
168 | ||
169 | static int dpcm_decode_frame(AVCodecContext *avctx, void *data, | |
170 | int *got_frame_ptr, AVPacket *avpkt) | |
171 | { | |
172 | int buf_size = avpkt->size; | |
173 | DPCMContext *s = avctx->priv_data; | |
174 | AVFrame *frame = data; | |
175 | int out = 0, ret; | |
176 | int predictor[2]; | |
177 | int ch = 0; | |
178 | int stereo = avctx->channels - 1; | |
179 | int16_t *output_samples, *samples_end; | |
180 | GetByteContext gb; | |
181 | ||
182 | if (stereo && (buf_size & 1)) | |
183 | buf_size--; | |
184 | bytestream2_init(&gb, avpkt->data, buf_size); | |
185 | ||
186 | /* calculate output size */ | |
187 | switch(avctx->codec->id) { | |
188 | case AV_CODEC_ID_ROQ_DPCM: | |
189 | out = buf_size - 8; | |
190 | break; | |
191 | case AV_CODEC_ID_INTERPLAY_DPCM: | |
192 | out = buf_size - 6 - avctx->channels; | |
193 | break; | |
194 | case AV_CODEC_ID_XAN_DPCM: | |
195 | out = buf_size - 2 * avctx->channels; | |
196 | break; | |
197 | case AV_CODEC_ID_SOL_DPCM: | |
198 | if (avctx->codec_tag != 3) | |
199 | out = buf_size * 2; | |
200 | else | |
201 | out = buf_size; | |
202 | break; | |
203 | } | |
204 | if (out <= 0) { | |
205 | av_log(avctx, AV_LOG_ERROR, "packet is too small\n"); | |
206 | return AVERROR(EINVAL); | |
207 | } | |
208 | if (out % avctx->channels) { | |
209 | av_log(avctx, AV_LOG_WARNING, "channels have differing number of samples\n"); | |
210 | } | |
211 | ||
212 | /* get output buffer */ | |
213 | frame->nb_samples = (out + avctx->channels - 1) / avctx->channels; | |
214 | if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) | |
215 | return ret; | |
216 | output_samples = (int16_t *)frame->data[0]; | |
217 | samples_end = output_samples + out; | |
218 | ||
219 | switch(avctx->codec->id) { | |
220 | ||
221 | case AV_CODEC_ID_ROQ_DPCM: | |
222 | bytestream2_skipu(&gb, 6); | |
223 | ||
224 | if (stereo) { | |
225 | predictor[1] = sign_extend(bytestream2_get_byteu(&gb) << 8, 16); | |
226 | predictor[0] = sign_extend(bytestream2_get_byteu(&gb) << 8, 16); | |
227 | } else { | |
228 | predictor[0] = sign_extend(bytestream2_get_le16u(&gb), 16); | |
229 | } | |
230 | ||
231 | /* decode the samples */ | |
232 | while (output_samples < samples_end) { | |
233 | predictor[ch] += s->roq_square_array[bytestream2_get_byteu(&gb)]; | |
234 | predictor[ch] = av_clip_int16(predictor[ch]); | |
235 | *output_samples++ = predictor[ch]; | |
236 | ||
237 | /* toggle channel */ | |
238 | ch ^= stereo; | |
239 | } | |
240 | break; | |
241 | ||
242 | case AV_CODEC_ID_INTERPLAY_DPCM: | |
243 | bytestream2_skipu(&gb, 6); /* skip over the stream mask and stream length */ | |
244 | ||
245 | for (ch = 0; ch < avctx->channels; ch++) { | |
246 | predictor[ch] = sign_extend(bytestream2_get_le16u(&gb), 16); | |
247 | *output_samples++ = predictor[ch]; | |
248 | } | |
249 | ||
250 | ch = 0; | |
251 | while (output_samples < samples_end) { | |
252 | predictor[ch] += interplay_delta_table[bytestream2_get_byteu(&gb)]; | |
253 | predictor[ch] = av_clip_int16(predictor[ch]); | |
254 | *output_samples++ = predictor[ch]; | |
255 | ||
256 | /* toggle channel */ | |
257 | ch ^= stereo; | |
258 | } | |
259 | break; | |
260 | ||
261 | case AV_CODEC_ID_XAN_DPCM: | |
262 | { | |
263 | int shift[2] = { 4, 4 }; | |
264 | ||
265 | for (ch = 0; ch < avctx->channels; ch++) | |
266 | predictor[ch] = sign_extend(bytestream2_get_le16u(&gb), 16); | |
267 | ||
268 | ch = 0; | |
269 | while (output_samples < samples_end) { | |
270 | int diff = bytestream2_get_byteu(&gb); | |
271 | int n = diff & 3; | |
272 | ||
273 | if (n == 3) | |
274 | shift[ch]++; | |
275 | else | |
276 | shift[ch] -= (2 * n); | |
277 | diff = sign_extend((diff &~ 3) << 8, 16); | |
278 | ||
279 | /* saturate the shifter to a lower limit of 0 */ | |
280 | if (shift[ch] < 0) | |
281 | shift[ch] = 0; | |
282 | ||
283 | diff >>= shift[ch]; | |
284 | predictor[ch] += diff; | |
285 | ||
286 | predictor[ch] = av_clip_int16(predictor[ch]); | |
287 | *output_samples++ = predictor[ch]; | |
288 | ||
289 | /* toggle channel */ | |
290 | ch ^= stereo; | |
291 | } | |
292 | break; | |
293 | } | |
294 | case AV_CODEC_ID_SOL_DPCM: | |
295 | if (avctx->codec_tag != 3) { | |
296 | uint8_t *output_samples_u8 = frame->data[0], | |
297 | *samples_end_u8 = output_samples_u8 + out; | |
298 | while (output_samples_u8 < samples_end_u8) { | |
299 | int n = bytestream2_get_byteu(&gb); | |
300 | ||
301 | s->sample[0] += s->sol_table[n >> 4]; | |
302 | s->sample[0] = av_clip_uint8(s->sample[0]); | |
303 | *output_samples_u8++ = s->sample[0]; | |
304 | ||
305 | s->sample[stereo] += s->sol_table[n & 0x0F]; | |
306 | s->sample[stereo] = av_clip_uint8(s->sample[stereo]); | |
307 | *output_samples_u8++ = s->sample[stereo]; | |
308 | } | |
309 | } else { | |
310 | while (output_samples < samples_end) { | |
311 | int n = bytestream2_get_byteu(&gb); | |
312 | if (n & 0x80) s->sample[ch] -= sol_table_16[n & 0x7F]; | |
313 | else s->sample[ch] += sol_table_16[n & 0x7F]; | |
314 | s->sample[ch] = av_clip_int16(s->sample[ch]); | |
315 | *output_samples++ = s->sample[ch]; | |
316 | /* toggle channel */ | |
317 | ch ^= stereo; | |
318 | } | |
319 | } | |
320 | break; | |
321 | } | |
322 | ||
323 | *got_frame_ptr = 1; | |
324 | ||
325 | return avpkt->size; | |
326 | } | |
327 | ||
328 | #define DPCM_DECODER(id_, name_, long_name_) \ | |
329 | AVCodec ff_ ## name_ ## _decoder = { \ | |
330 | .name = #name_, \ | |
331 | .long_name = NULL_IF_CONFIG_SMALL(long_name_), \ | |
332 | .type = AVMEDIA_TYPE_AUDIO, \ | |
333 | .id = id_, \ | |
334 | .priv_data_size = sizeof(DPCMContext), \ | |
335 | .init = dpcm_decode_init, \ | |
336 | .decode = dpcm_decode_frame, \ | |
337 | .capabilities = CODEC_CAP_DR1, \ | |
338 | } | |
339 | ||
340 | DPCM_DECODER(AV_CODEC_ID_INTERPLAY_DPCM, interplay_dpcm, "DPCM Interplay"); | |
341 | DPCM_DECODER(AV_CODEC_ID_ROQ_DPCM, roq_dpcm, "DPCM id RoQ"); | |
342 | DPCM_DECODER(AV_CODEC_ID_SOL_DPCM, sol_dpcm, "DPCM Sol"); | |
343 | DPCM_DECODER(AV_CODEC_ID_XAN_DPCM, xan_dpcm, "DPCM Xan"); |