FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavformat/usmdec.c
Date: 2025-11-03 03:39:10
Exec Total Coverage
Lines: 3 256 1.2%
Functions: 1 6 16.7%
Branches: 1 146 0.7%
Line Branch Exec Source
1 /*
2 * USM demuxer
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/intfloat.h"
23 #include "libavutil/intreadwrite.h"
24 #include "libavutil/mem.h"
25 #include "libavcodec/bytestream.h"
26
27 #include "avformat.h"
28 #include "demux.h"
29 #include "internal.h"
30
31 #define VIDEOI 0
32 #define AUDIOI 1
33 #define ALPHAI 2
34 #define SUBTTI 3
35
36 typedef struct USMChannel {
37 int index;
38 int used;
39 int type;
40 int codec_id;
41 int nb_channels;
42 int nb_frames;
43 AVRational rate;
44 int width, height;
45 int64_t duration;
46 int64_t extradata_pos;
47 } USMChannel;
48
49 typedef struct USMDemuxContext {
50 USMChannel ch[4][256];
51 int nb_channels[4];
52 uint8_t *header;
53 unsigned header_size;
54 } USMDemuxContext;
55
56 7282 static int usm_probe(const AVProbeData *p)
57 {
58
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 7282 if (AV_RL32(p->buf) != MKTAG('C','R','I','D'))
59 7282 return 0;
60
61 ✗ if (AV_RN32(p->buf + 4) == 0)
62 ✗ return 0;
63
64 ✗ return AVPROBE_SCORE_MAX / 3;
65 }
66
67 ✗ static int usm_read_header(AVFormatContext *s)
68 {
69 ✗ s->ctx_flags |= AVFMTCTX_NOHEADER;
70 ✗ return 0;
71 }
72
73 ✗ static int parse_utf(AVFormatContext *s, AVIOContext *pb,
74 USMChannel *ch, int ch_type,
75 uint32_t parent_chunk_size)
76 {
77 ✗ USMDemuxContext *usm = s->priv_data;
78 GetByteContext gb, ugb, sgb;
79 uint32_t chunk_type, chunk_size, offset;
80 uint32_t unique_offset, string_offset;
81 int nb_items, unique_size, nb_dictionaries;
82 ✗ AVRational fps = { 0 };
83 int type;
84
85 ✗ chunk_type = avio_rb32(pb);
86 ✗ chunk_size = avio_rb32(pb);
87
88 ✗ if (chunk_type != MKBETAG('@','U','T','F'))
89 ✗ return AVERROR_INVALIDDATA;
90
91 ✗ if (!chunk_size || chunk_size >= parent_chunk_size)
92 ✗ return AVERROR_INVALIDDATA;
93
94 ✗ av_fast_malloc(&usm->header, &usm->header_size, chunk_size);
95 ✗ if (!usm->header)
96 ✗ return AVERROR(ENOMEM);
97
98 ✗ if (avio_read(pb, usm->header, chunk_size) != chunk_size)
99 ✗ return AVERROR_EOF;
100
101 ✗ bytestream2_init(&gb, usm->header, chunk_size);
102 ✗ ugb = gb;
103 ✗ sgb = gb;
104 ✗ unique_offset = bytestream2_get_be32(&gb);
105 ✗ string_offset = bytestream2_get_be32(&gb);
106 ✗ /*byte_offset =*/ bytestream2_get_be32(&gb);
107 ✗ /*payload_name_offset =*/ bytestream2_get_be32(&gb);
108 ✗ nb_items = bytestream2_get_be16(&gb);
109 ✗ unique_size = bytestream2_get_be16(&gb);
110 ✗ nb_dictionaries = bytestream2_get_be32(&gb);
111 ✗ if (nb_dictionaries == 0)
112 ✗ return AVERROR_INVALIDDATA;
113
114 ✗ bytestream2_skip(&ugb, unique_offset);
115 ✗ if (bytestream2_get_bytes_left(&ugb) < unique_size)
116 ✗ return AVERROR_INVALIDDATA;
117 ✗ bytestream2_init(&ugb, ugb.buffer, unique_size);
118
119 ✗ bytestream2_skip(&sgb, string_offset);
120
121 ✗ for (int i = 0; i < nb_items; i++) {
122 GetByteContext *xgb;
123 uint8_t key[256];
124 ✗ int64_t value = -1;
125 ✗ int n = 0;
126
127 ✗ type = bytestream2_get_byte(&gb);
128 ✗ offset = bytestream2_get_be32(&gb);
129
130 ✗ bytestream2_seek(&sgb, string_offset + offset, SEEK_SET);
131 ✗ while (bytestream2_get_bytes_left(&sgb) > 0) {
132 ✗ key[n] = bytestream2_get_byte(&sgb);
133 ✗ if (!key[n])
134 ✗ break;
135 ✗ if (n >= sizeof(key) - 1)
136 ✗ break;
137 ✗ n++;
138 }
139 ✗ key[n] = '\0';
140
141 ✗ if ((type >> 5) == 1)
142 ✗ xgb = &gb;
143 else
144 ✗ xgb = &ugb;
145
146 ✗ switch (type & 0x1F) {
147 ✗ case 0x10:
148 case 0x11:
149 ✗ value = bytestream2_get_byte(xgb);
150 ✗ break;
151 ✗ case 0x12:
152 case 0x13:
153 ✗ value = bytestream2_get_be16(xgb);
154 ✗ break;
155 ✗ case 0x14:
156 case 0x15:
157 ✗ value = bytestream2_get_be32(xgb);
158 ✗ break;
159 ✗ case 0x16:
160 case 0x17:
161 ✗ value = bytestream2_get_be64(xgb);
162 ✗ break;
163 ✗ case 0x18:
164 ✗ value = av_int2float(bytestream2_get_be32(xgb));
165 ✗ break;
166 ✗ case 0x19:
167 ✗ value = av_int2double(bytestream2_get_be64(xgb));
168 ✗ break;
169 ✗ case 0x1A:
170 ✗ break;
171 }
172
173 ✗ if (ch_type == AUDIOI) {
174 ✗ if (!strcmp(key, "sampling_rate")) {
175 ✗ ch->rate.num = value;
176 ✗ ch->rate.den = 1;
177 ✗ } else if (!strcmp(key, "num_channels")) {
178 ✗ ch->nb_channels = value;
179 ✗ } else if (!strcmp(key, "total_samples")) {
180 ✗ ch->duration = value;
181 ✗ } else if (!strcmp(key, "audio_codec")) {
182 ✗ switch (value) {
183 ✗ case 2:
184 ✗ ch->codec_id = AV_CODEC_ID_ADPCM_ADX;
185 ✗ break;
186 ✗ case 4:
187 ✗ ch->codec_id = AV_CODEC_ID_HCA;
188 ✗ break;
189 ✗ default:
190 ✗ av_log(s, AV_LOG_ERROR, "unsupported audio: %d\n", (int)value);
191 ✗ break;
192 }
193 }
194 ✗ } else if (ch_type == VIDEOI || ch_type == ALPHAI) {
195 ✗ if (!strcmp(key, "width")) {
196 ✗ ch->width = value;
197 ✗ } else if (!strcmp(key, "height")) {
198 ✗ ch->height = value;
199 ✗ } else if (!strcmp(key, "total_frames")) {
200 ✗ ch->nb_frames = value;
201 ✗ } else if (!strcmp(key, "framerate_n")) {
202 ✗ fps.num = value;
203 ✗ } else if (!strcmp(key, "framerate_d")) {
204 ✗ fps.den = value;
205 ✗ } else if (!strcmp(key, "mpeg_codec")) {
206 ✗ switch (value) {
207 ✗ case 1:
208 ✗ ch->codec_id = AV_CODEC_ID_MPEG1VIDEO;
209 ✗ break;
210 ✗ case 5:
211 ✗ ch->codec_id = AV_CODEC_ID_H264;
212 ✗ break;
213 ✗ case 9:
214 ✗ ch->codec_id = AV_CODEC_ID_VP9;
215 ✗ break;
216 ✗ default:
217 ✗ av_log(s, AV_LOG_ERROR, "unsupported video: %d\n", (int)value);
218 ✗ break;
219 }
220 }
221 }
222 }
223
224 ✗ if (ch_type == VIDEOI && fps.num && fps.den)
225 ✗ ch->rate = fps;
226
227 ✗ return 0;
228 }
229
230 ✗ static int64_t parse_chunk(AVFormatContext *s, AVIOContext *pb,
231 uint32_t chunk_type, uint32_t chunk_size,
232 AVPacket *pkt)
233 {
234 ✗ const int is_audio = chunk_type == MKBETAG('@','S','F','A');
235 ✗ const int is_alpha = chunk_type == MKBETAG('@','A','L','P');
236 ✗ const int is_subtt = chunk_type == MKBETAG('@','S','B','T');
237 ✗ USMDemuxContext *usm = s->priv_data;
238 int padding_size, payload_type, payload_offset;
239 ✗ const int ch_type = is_subtt ? SUBTTI : is_audio ? AUDIOI : is_alpha ? ALPHAI : VIDEOI;
240 int stream_index, frame_rate;
241 int64_t chunk_start, ret;
242
243 ✗ ret = avio_tell(pb);
244 ✗ if (ret < 0)
245 ✗ return ret;
246 ✗ chunk_start = ret;
247 ✗ avio_skip(pb, 1);
248 ✗ payload_offset = avio_r8(pb);
249 ✗ padding_size = avio_rb16(pb);
250 ✗ stream_index = avio_r8(pb);
251 ✗ avio_skip(pb, 2);
252 ✗ payload_type = avio_r8(pb);
253 ✗ /*frame_time =*/ avio_rb32(pb);
254 ✗ frame_rate = avio_rb32(pb);
255 ✗ avio_skip(pb, 8);
256 ✗ ret = avio_tell(pb);
257 ✗ if (ret < 0)
258 ✗ return ret;
259 ✗ ret = avio_skip(pb, FFMAX(0, (ret - chunk_start) - payload_offset));
260 ✗ if (ret < 0)
261 ✗ return ret;
262
263 ✗ if (payload_type == 1) {
264 ✗ if (usm->ch[ch_type][stream_index].used == 0) {
265 ✗ USMChannel *ch = &usm->ch[ch_type][stream_index];
266
267 ✗ switch (ch_type) {
268 ✗ case ALPHAI:
269 case VIDEOI:
270 ✗ ch->type = AVMEDIA_TYPE_VIDEO;
271 ✗ break;
272 ✗ case AUDIOI:
273 ✗ ch->type = AVMEDIA_TYPE_AUDIO;
274 ✗ break;
275 ✗ case SUBTTI:
276 ✗ ch->type = AVMEDIA_TYPE_SUBTITLE;
277 ✗ break;
278 ✗ default:
279 ✗ return AVERROR_INVALIDDATA;
280 }
281
282 ✗ ch->used = 1;
283 ✗ ch->index = -1;
284 ✗ usm->nb_channels[ch_type]++;
285
286 ✗ ret = parse_utf(s, pb, ch, ch_type, chunk_size);
287 ✗ if (ret < 0)
288 ✗ return ret;
289 }
290 ✗ } else if (payload_type == 0) {
291 ✗ if (usm->ch[ch_type][stream_index].used == 1) {
292 ✗ USMChannel *ch = &usm->ch[ch_type][stream_index];
293 ✗ int get_extradata = 0;
294 uint32_t pkt_size;
295 AVStream *st;
296
297 ✗ if (ch->index < 0) {
298 AVCodecParameters *par;
299 ✗ st = avformat_new_stream(s, NULL);
300 ✗ if (!st)
301 ✗ return AVERROR(ENOMEM);
302 ✗ par = st->codecpar;
303 ✗ par->codec_type = ch->type;
304 ✗ par->codec_id = ch->codec_id;
305 ✗ st->start_time = 0;
306
307 ✗ switch (ch->type) {
308 ✗ case AVMEDIA_TYPE_VIDEO:
309 ✗ par->width = ch->width;
310 ✗ par->height = ch->height;
311 ✗ st->nb_frames = ch->nb_frames;
312 ✗ break;
313 ✗ case AVMEDIA_TYPE_AUDIO:
314 ✗ par->sample_rate = ch->rate.num;
315 ✗ par->ch_layout.nb_channels = ch->nb_channels;
316 ✗ st->duration = ch->duration;
317 ✗ break;
318 }
319
320 ✗ ch->index = st->index;
321 ✗ if (!ch->rate.num || !ch->rate.den)
322 ✗ ch->rate = av_make_q(frame_rate, 100);
323 ✗ avpriv_set_pts_info(st, 64, ch->rate.den, ch->rate.num);
324
325 ✗ ffstream(st)->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;
326 ✗ get_extradata = ch->codec_id == AV_CODEC_ID_ADPCM_ADX;
327 ✗ ch->extradata_pos = avio_tell(pb);
328 }
329
330 ✗ ret = avio_tell(pb);
331 ✗ if (ret < 0)
332 ✗ return ret;
333
334 ✗ pkt_size = chunk_size - (ret - chunk_start) - padding_size;
335 ✗ if (get_extradata) {
336 ✗ if ((ret = ff_get_extradata(s, st->codecpar, pb, pkt_size)) < 0)
337 ✗ return ret;
338 } else {
339 ✗ if (ret == ch->extradata_pos && ch->codec_id == AV_CODEC_ID_ADPCM_ADX) {
340 ✗ avio_skip(pb, pkt_size);
341 ✗ ret = 0;
342 } else {
343 ✗ ret = av_get_packet(pb, pkt, pkt_size);
344 ✗ if (ret < 0)
345 ✗ return ret;
346
347 ✗ pkt->stream_index = ch->index;
348 }
349 }
350
351 ✗ avio_skip(pb, padding_size);
352
353 ✗ if (ret != pkt_size)
354 ✗ return AVERROR_EOF;
355 ✗ if (get_extradata == 0)
356 ✗ return ret;
357 }
358 }
359
360 ✗ ret = avio_tell(pb);
361 ✗ if (ret < 0)
362 ✗ return ret;
363 ✗ ret = avio_skip(pb, FFMAX(0, chunk_size - (ret - chunk_start)));
364 ✗ if (ret < 0)
365 ✗ return ret;
366 ✗ return FFERROR_REDO;
367 }
368
369 ✗ static int usm_read_packet(AVFormatContext *s, AVPacket *pkt)
370 {
371 ✗ AVIOContext *pb = s->pb;
372 ✗ int64_t ret = AVERROR_EOF;
373
374 ✗ while (!avio_feof(pb)) {
375 uint32_t chunk_type, chunk_size;
376 ✗ int got_packet = 0;
377 int64_t pos;
378
379 ✗ pos = avio_tell(pb);
380 ✗ if (pos < 0)
381 ✗ return pos;
382 ✗ chunk_type = avio_rb32(pb);
383 ✗ chunk_size = avio_rb32(pb);
384 ✗ if (!chunk_size)
385 ✗ return AVERROR_INVALIDDATA;
386
387 ✗ switch (chunk_type) {
388 ✗ case MKBETAG('C','R','I','D'):
389 default:
390 ✗ ret = avio_skip(pb, chunk_size);
391 ✗ break;
392 ✗ case MKBETAG('@','A','L','P'):
393 case MKBETAG('@','S','B','T'):
394 case MKBETAG('@','S','F','A'):
395 case MKBETAG('@','S','F','V'):
396 ✗ ret = parse_chunk(s, pb, chunk_type, chunk_size, pkt);
397 ✗ got_packet = ret > 0;
398 ✗ break;
399 }
400
401 ✗ if (got_packet)
402 ✗ pkt->pos = pos;
403
404 ✗ if (got_packet || ret < 0)
405 break;
406 }
407
408 ✗ return ret;
409 }
410
411 ✗ static int usm_read_close(AVFormatContext *s)
412 {
413 ✗ USMDemuxContext *usm = s->priv_data;
414 ✗ av_freep(&usm->header);
415 ✗ usm->header_size = 0;
416 ✗ return 0;
417 }
418
419 const FFInputFormat ff_usm_demuxer = {
420 .p.name = "usm",
421 .p.long_name = NULL_IF_CONFIG_SMALL("CRI USM"),
422 .p.extensions = "usm",
423 .p.flags = AVFMT_GENERIC_INDEX | AVFMT_NO_BYTE_SEEK | AVFMT_NOBINSEARCH,
424 .priv_data_size = sizeof(USMDemuxContext),
425 .read_probe = usm_probe,
426 .read_header = usm_read_header,
427 .read_packet = usm_read_packet,
428 .read_close = usm_read_close,
429 };
430