FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/osq.c
Date: 2025-06-23 20:06:14
Exec Total Coverage
Lines: 181 285 63.5%
Functions: 8 12 66.7%
Branches: 84 150 56.0%
Line Branch Exec Source
1 /*
2 * OSQ audio decoder
3 * Copyright (c) 2023 Paul B Mahol
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 #include "libavutil/internal.h"
23 #include "libavutil/intreadwrite.h"
24 #include "libavutil/mem.h"
25 #include "avcodec.h"
26 #include "codec_internal.h"
27 #include "decode.h"
28 #include "internal.h"
29 #define BITSTREAM_READER_LE
30 #include "get_bits.h"
31 #include "unary.h"
32
33 #define OFFSET 5
34
35 typedef struct OSQChannel {
36 unsigned prediction;
37 unsigned coding_mode;
38 unsigned residue_parameter;
39 unsigned residue_bits;
40 unsigned history[3];
41 unsigned pos, count;
42 double sum;
43 int32_t prev;
44 } OSQChannel;
45
46 typedef struct OSQContext {
47 GetBitContext gb;
48 OSQChannel ch[2];
49
50 uint8_t *bitstream;
51 size_t max_framesize;
52 size_t bitstream_size;
53
54 int factor;
55 int decorrelate;
56 int frame_samples;
57 uint64_t nb_samples;
58
59 int32_t *decode_buffer[2];
60
61 AVPacket *pkt;
62 int pkt_offset;
63 } OSQContext;
64
65 ✗ static void osq_flush(AVCodecContext *avctx)
66 {
67 ✗ OSQContext *s = avctx->priv_data;
68
69 ✗ s->bitstream_size = 0;
70 ✗ s->pkt_offset = 0;
71 ✗ }
72
73 2 static av_cold int osq_close(AVCodecContext *avctx)
74 {
75 2 OSQContext *s = avctx->priv_data;
76
77 2 av_freep(&s->bitstream);
78 2 s->bitstream_size = 0;
79
80
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 6 for (int ch = 0; ch < FF_ARRAY_ELEMS(s->decode_buffer); ch++)
81 4 av_freep(&s->decode_buffer[ch]);
82
83 2 return 0;
84 }
85
86 2 static av_cold int osq_init(AVCodecContext *avctx)
87 {
88 2 OSQContext *s = avctx->priv_data;
89
90
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 2 if (avctx->extradata_size < 48)
91 ✗ return AVERROR(EINVAL);
92
93
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 2 if (avctx->extradata[0] != 1) {
94 ✗ av_log(avctx, AV_LOG_ERROR, "Unsupported version.\n");
95 ✗ return AVERROR_INVALIDDATA;
96 }
97
98 2 avctx->sample_rate = AV_RL32(avctx->extradata + 4);
99
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 2 if (avctx->sample_rate < 1)
100 ✗ return AVERROR_INVALIDDATA;
101
102 2 av_channel_layout_uninit(&avctx->ch_layout);
103 2 avctx->ch_layout.order = AV_CHANNEL_ORDER_UNSPEC;
104 2 avctx->ch_layout.nb_channels = avctx->extradata[3];
105
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 2 if (avctx->ch_layout.nb_channels < 1)
106 ✗ return AVERROR_INVALIDDATA;
107
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 2 if (avctx->ch_layout.nb_channels > FF_ARRAY_ELEMS(s->decode_buffer))
108 ✗ return AVERROR_INVALIDDATA;
109
110 2 s->factor = 1;
111
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 2 switch (avctx->extradata[2]) {
112 ✗ case 8: avctx->sample_fmt = AV_SAMPLE_FMT_U8P; break;
113 2 case 16: avctx->sample_fmt = AV_SAMPLE_FMT_S16P; break;
114 ✗ case 20:
115 ✗ case 24: s->factor = 256;
116 ✗ avctx->sample_fmt = AV_SAMPLE_FMT_S32P; break;
117 ✗ default: return AVERROR_INVALIDDATA;
118 }
119
120 2 avctx->bits_per_raw_sample = avctx->extradata[2];
121 2 s->nb_samples = AV_RL64(avctx->extradata + 16);
122 2 s->frame_samples = AV_RL16(avctx->extradata + 8);
123 2 s->max_framesize = (s->frame_samples * 16 + 1024) * avctx->ch_layout.nb_channels;
124
125 2 s->bitstream = av_calloc(s->max_framesize + AV_INPUT_BUFFER_PADDING_SIZE, sizeof(*s->bitstream));
126
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 2 if (!s->bitstream)
127 ✗ return AVERROR(ENOMEM);
128
129
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 6 for (int ch = 0; ch < avctx->ch_layout.nb_channels; ch++) {
130 4 s->decode_buffer[ch] = av_calloc(s->frame_samples + OFFSET,
131 sizeof(*s->decode_buffer[ch]));
132
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 4 if (!s->decode_buffer[ch])
133 ✗ return AVERROR(ENOMEM);
134 }
135
136 2 s->pkt = avctx->internal->in_pkt;
137
138 2 return 0;
139 }
140
141 ✗ static void reset_stats(OSQChannel *cb)
142 {
143 ✗ memset(cb->history, 0, sizeof(cb->history));
144 ✗ cb->pos = cb->count = cb->sum = 0;
145 ✗ }
146
147 ✗ static void update_stats(OSQChannel *cb, int val)
148 {
149 ✗ cb->sum += FFABS((int64_t)val) - cb->history[cb->pos];
150 ✗ cb->history[cb->pos] = FFABS((int64_t)val);
151 ✗ cb->pos++;
152 ✗ cb->count++;
153 //NOTE for this to make sense count would need to be limited to FF_ARRAY_ELEMS(cb->history)
154 //Otherwise the average computation later makes no sense
155 ✗ if (cb->pos >= FF_ARRAY_ELEMS(cb->history))
156 ✗ cb->pos = 0;
157 ✗ }
158
159 ✗ static int update_residue_parameter(OSQChannel *cb)
160 {
161 double sum, x;
162 int rice_k;
163
164 ✗ sum = cb->sum;
165 ✗ if (!sum)
166 ✗ return 0;
167 ✗ x = sum / cb->count;
168 av_assert2(x <= 0x80000000U);
169 ✗ rice_k = av_ceil_log2(x);
170 ✗ if (rice_k >= 30) {
171 ✗ double f = floor(sum / 1.4426952 + 0.5);
172 ✗ if (f <= 1) {
173 ✗ rice_k = 1;
174 ✗ } else if (f >= 31) {
175 ✗ rice_k = 31;
176 } else
177 ✗ rice_k = f;
178 }
179
180 ✗ return rice_k;
181 }
182
183 847722 static uint32_t get_urice(GetBitContext *gb, int k)
184 {
185 uint32_t z, x, b;
186
187 847722 x = get_unary(gb, 1, 512);
188 847722 b = get_bits_long(gb, k);
189 847722 z = b | x << k;
190
191 847722 return z;
192 }
193
194 837900 static int32_t get_srice(GetBitContext *gb, int x)
195 {
196 837900 uint32_t y = get_urice(gb, x);
197
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 837900 return get_bits1(gb) ? -y : y;
198 }
199
200 3274 static int osq_channel_parameters(AVCodecContext *avctx, int ch)
201 {
202 3274 OSQContext *s = avctx->priv_data;
203 3274 OSQChannel *cb = &s->ch[ch];
204 3274 GetBitContext *gb = &s->gb;
205
206 3274 cb->prev = 0;
207 3274 cb->prediction = get_urice(gb, 5);
208 3274 cb->coding_mode = get_urice(gb, 3);
209
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 3274 if (cb->prediction >= 15)
210 ✗ return AVERROR_INVALIDDATA;
211
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 3274 if (cb->coding_mode > 0 && cb->coding_mode < 3) {
212 3274 cb->residue_parameter = get_urice(gb, 4);
213
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 3274 if (!cb->residue_parameter || cb->residue_parameter >= 31)
214 ✗ return AVERROR_INVALIDDATA;
215
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 3274 if (cb->coding_mode == 2)
216 ✗ avpriv_request_sample(avctx, "coding mode 2");
217 ✗ } else if (cb->coding_mode == 3) {
218 ✗ cb->residue_bits = get_urice(gb, 4);
219 ✗ if (!cb->residue_bits || cb->residue_bits >= 31)
220 ✗ return AVERROR_INVALIDDATA;
221 ✗ } else if (cb->coding_mode) {
222 ✗ return AVERROR_INVALIDDATA;
223 }
224
225
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 3274 if (cb->coding_mode == 2)
226 ✗ reset_stats(cb);
227
228 3274 return 0;
229 }
230
231 #define A (-1)
232 #define B (-2)
233 #define C (-3)
234 #define D (-4)
235 #define E (-5)
236 #define P2 (((unsigned)dst[A] + dst[A]) - dst[B])
237 #define P3 (((unsigned)dst[A] - dst[B]) * 3 + dst[C])
238
239 1637 static int do_decode(AVCodecContext *avctx, AVFrame *frame, int decorrelate, int downsample)
240 {
241 1637 OSQContext *s = avctx->priv_data;
242 1637 const int nb_channels = avctx->ch_layout.nb_channels;
243 1637 const int nb_samples = frame->nb_samples;
244 1637 GetBitContext *gb = &s->gb;
245
246
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 420587 for (int n = 0; n < nb_samples; n++) {
247
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 1256850 for (int ch = 0; ch < nb_channels; ch++) {
248 837900 OSQChannel *cb = &s->ch[ch];
249 837900 int32_t *dst = s->decode_buffer[ch] + OFFSET;
250 837900 int32_t p, prev = cb->prev;
251
252
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 837900 if (nb_channels == 2 && ch == 1 && decorrelate != s->decorrelate) {
253
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 99 if (!decorrelate) {
254 49 s->decode_buffer[1][OFFSET+A] += s->decode_buffer[0][OFFSET+B];
255 49 s->decode_buffer[1][OFFSET+B] += s->decode_buffer[0][OFFSET+C];
256 49 s->decode_buffer[1][OFFSET+C] += s->decode_buffer[0][OFFSET+D];
257 49 s->decode_buffer[1][OFFSET+D] += s->decode_buffer[0][OFFSET+E];
258 } else {
259 50 s->decode_buffer[1][OFFSET+A] -= s->decode_buffer[0][OFFSET+B];
260 50 s->decode_buffer[1][OFFSET+B] -= s->decode_buffer[0][OFFSET+C];
261 50 s->decode_buffer[1][OFFSET+C] -= s->decode_buffer[0][OFFSET+D];
262 50 s->decode_buffer[1][OFFSET+D] -= s->decode_buffer[0][OFFSET+E];
263 }
264 99 s->decorrelate = decorrelate;
265 }
266
267
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 837900 if (!cb->coding_mode) {
268 ✗ dst[n] = 0;
269
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 837900 } else if (cb->coding_mode == 3) {
270 ✗ dst[n] = get_sbits_long(gb, cb->residue_bits);
271 } else {
272 837900 dst[n] = get_srice(gb, cb->residue_parameter);
273 }
274
275
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 837900 if (get_bits_left(gb) < 0) {
276 ✗ av_log(avctx, AV_LOG_ERROR, "overread!\n");
277 ✗ return AVERROR_INVALIDDATA;
278 }
279
280 837900 p = prev / 2;
281 837900 prev = dst[n];
282
283
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 837900 switch (cb->prediction) {
284 13056 case 0:
285 13056 break;
286 49920 case 1:
287 49920 dst[n] += (unsigned)dst[A];
288 49920 break;
289 159232 case 2:
290 159232 dst[n] += (unsigned)dst[A] + p;
291 159232 break;
292 35462 case 3:
293 35462 dst[n] += P2;
294 35462 break;
295 29184 case 4:
296 29184 dst[n] += P2 + p;
297 29184 break;
298 ✗ case 5:
299 ✗ dst[n] += P3;
300 ✗ break;
301 ✗ case 6:
302 ✗ dst[n] += P3 + p;
303 ✗ break;
304 14592 case 7:
305 14592 dst[n] += (int)(P2 + P3) / 2 + (unsigned)p;
306 14592 break;
307 23296 case 8:
308 23296 dst[n] += (int)(P2 + P3) / 2 + 0U;
309 23296 break;
310 29440 case 9:
311 29440 dst[n] += (int)(P2 * 2 + P3) / 3 + (unsigned)p;
312 29440 break;
313 11264 case 10:
314 11264 dst[n] += (int)(P2 + P3 * 2) / 3 + (unsigned)p;
315 11264 break;
316 38656 case 11:
317 38656 dst[n] += (int)((unsigned)dst[A] + dst[B]) / 2 + 0U;
318 38656 break;
319 ✗ case 12:
320 ✗ dst[n] += (unsigned)dst[B];
321 ✗ break;
322 13568 case 13:
323 13568 dst[n] += (int)((unsigned)dst[D] + dst[B]) / 2 + 0U;
324 13568 break;
325 420230 case 14:
326 420230 dst[n] += (int)((unsigned)P2 + dst[A]) / 2 + (unsigned)p;
327 420230 break;
328 ✗ default:
329 ✗ return AVERROR_INVALIDDATA;
330 }
331
332 837900 cb->prev = prev;
333
334
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 837900 if (downsample)
335 ✗ dst[n] *= 256U;
336
337 837900 dst[E] = dst[D];
338 837900 dst[D] = dst[C];
339 837900 dst[C] = dst[B];
340 837900 dst[B] = dst[A];
341 837900 dst[A] = dst[n];
342
343
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 837900 if (cb->coding_mode == 2) {
344 ✗ update_stats(cb, dst[n]);
345 ✗ cb->residue_parameter = update_residue_parameter(cb);
346 }
347
348
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 837900 if (nb_channels == 2 && ch == 1) {
349
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 418950 if (decorrelate)
350 390022 dst[n] += (unsigned)s->decode_buffer[0][OFFSET+n];
351 }
352
353
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 837900 if (downsample)
354 ✗ dst[A] /= 256;
355 }
356 }
357
358 1637 return 0;
359 }
360
361 1637 static int osq_decode_block(AVCodecContext *avctx, AVFrame *frame)
362 {
363 1637 const int nb_channels = avctx->ch_layout.nb_channels;
364 1637 const int nb_samples = frame->nb_samples;
365 1637 OSQContext *s = avctx->priv_data;
366 1637 const unsigned factor = s->factor;
367 int ret, decorrelate, downsample;
368 1637 GetBitContext *gb = &s->gb;
369
370 1637 skip_bits1(gb);
371 1637 decorrelate = get_bits1(gb);
372 1637 downsample = get_bits1(gb);
373
374
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 4911 for (int ch = 0; ch < nb_channels; ch++) {
375
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 3274 if ((ret = osq_channel_parameters(avctx, ch)) < 0) {
376 ✗ av_log(avctx, AV_LOG_ERROR, "invalid channel parameters\n");
377 ✗ return ret;
378 }
379 }
380
381
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 1637 if ((ret = do_decode(avctx, frame, decorrelate, downsample)) < 0)
382 ✗ return ret;
383
384 1637 align_get_bits(gb);
385
386
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 1637 switch (avctx->sample_fmt) {
387 ✗ case AV_SAMPLE_FMT_U8P:
388 ✗ for (int ch = 0; ch < nb_channels; ch++) {
389 ✗ uint8_t *dst = (uint8_t *)frame->extended_data[ch];
390 ✗ int32_t *src = s->decode_buffer[ch] + OFFSET;
391
392 ✗ for (int n = 0; n < nb_samples; n++)
393 ✗ dst[n] = av_clip_uint8(src[n] + 0x80);
394 }
395 ✗ break;
396 1637 case AV_SAMPLE_FMT_S16P:
397
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 4911 for (int ch = 0; ch < nb_channels; ch++) {
398 3274 int16_t *dst = (int16_t *)frame->extended_data[ch];
399 3274 int32_t *src = s->decode_buffer[ch] + OFFSET;
400
401
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 841174 for (int n = 0; n < nb_samples; n++)
402 837900 dst[n] = (int16_t)src[n];
403 }
404 1637 break;
405 ✗ case AV_SAMPLE_FMT_S32P:
406 ✗ for (int ch = 0; ch < nb_channels; ch++) {
407 ✗ int32_t *dst = (int32_t *)frame->extended_data[ch];
408 ✗ int32_t *src = s->decode_buffer[ch] + OFFSET;
409
410 ✗ for (int n = 0; n < nb_samples; n++)
411 ✗ dst[n] = src[n] * factor;
412 }
413 ✗ break;
414 ✗ default:
415 ✗ return AVERROR_BUG;
416 }
417
418 1637 return 0;
419 }
420
421 2674 static int osq_receive_frame(AVCodecContext *avctx, AVFrame *frame)
422 {
423 2674 OSQContext *s = avctx->priv_data;
424 2674 GetBitContext *gb = &s->gb;
425 int ret, n;
426
427
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 7992 while (s->bitstream_size < s->max_framesize) {
428 int size;
429
430
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 3698 if (!s->pkt->data) {
431 2080 ret = ff_decode_get_packet(avctx, s->pkt);
432
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 2080 if (ret == AVERROR_EOF && s->bitstream_size > 0)
433 17 break;
434
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 2063 if (ret == AVERROR_EOF || ret == AVERROR(EAGAIN))
435 1037 return ret;
436
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 1026 if (ret < 0)
437 ✗ goto fail;
438 }
439
440 2644 size = FFMIN(s->pkt->size - s->pkt_offset, s->max_framesize - s->bitstream_size);
441 2644 memcpy(s->bitstream + s->bitstream_size, s->pkt->data + s->pkt_offset, size);
442 2644 s->bitstream_size += size;
443 2644 s->pkt_offset += size;
444
445
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 2644 if (s->pkt_offset == s->pkt->size) {
446 1026 av_packet_unref(s->pkt);
447 1026 s->pkt_offset = 0;
448 }
449 }
450
451 1637 frame->nb_samples = FFMIN(s->frame_samples, s->nb_samples);
452
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 1637 if (frame->nb_samples <= 0)
453 ✗ return AVERROR_EOF;
454
455
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 1637 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
456 ✗ goto fail;
457
458
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 1637 if ((ret = init_get_bits8(gb, s->bitstream, s->bitstream_size)) < 0)
459 ✗ goto fail;
460
461
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 1637 if ((ret = osq_decode_block(avctx, frame)) < 0)
462 ✗ goto fail;
463
464 1637 s->nb_samples -= frame->nb_samples;
465
466 1637 n = get_bits_count(gb) / 8;
467
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 1637 if (n > s->bitstream_size) {
468 ✗ ret = AVERROR_INVALIDDATA;
469 ✗ goto fail;
470 }
471
472 1637 memmove(s->bitstream, &s->bitstream[n], s->bitstream_size - n);
473 1637 s->bitstream_size -= n;
474
475 1637 return 0;
476
477 ✗ fail:
478 ✗ s->bitstream_size = 0;
479 ✗ s->pkt_offset = 0;
480 ✗ av_packet_unref(s->pkt);
481
482 ✗ return ret;
483 }
484
485 const FFCodec ff_osq_decoder = {
486 .p.name = "osq",
487 CODEC_LONG_NAME("OSQ (Original Sound Quality)"),
488 .p.type = AVMEDIA_TYPE_AUDIO,
489 .p.id = AV_CODEC_ID_OSQ,
490 .priv_data_size = sizeof(OSQContext),
491 .init = osq_init,
492 FF_CODEC_RECEIVE_FRAME_CB(osq_receive_frame),
493 .close = osq_close,
494 .p.capabilities = AV_CODEC_CAP_CHANNEL_CONF |
495 AV_CODEC_CAP_DR1,
496 .caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
497 CODEC_SAMPLEFMTS(AV_SAMPLE_FMT_U8P, AV_SAMPLE_FMT_S16P, AV_SAMPLE_FMT_S32P),
498 .flush = osq_flush,
499 };
500