FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavformat/scd.c
Date: 2025-06-30 14:39:11
Exec Total Coverage
Lines: 3 170 1.8%
Functions: 1 8 12.5%
Branches: 1 87 1.1%
Line Branch Exec Source
1 /*
2 * Square Enix SCD demuxer
3 * Copyright (C) 2021 Zane van Iperen (zane@zanevaniperen.com)
4 *
5 * Based off documentation:
6 * http://ffxivexplorer.fragmenterworks.com/research/scd%20files.txt
7 *
8 * This file is part of FFmpeg.
9 *
10 * FFmpeg is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU Lesser General Public
12 * License as published by the Free Software Foundation; either
13 * version 2.1 of the License, or (at your option) any later version.
14 *
15 * FFmpeg is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * Lesser General Public License for more details.
19 *
20 * You should have received a copy of the GNU Lesser General Public
21 * License along with FFmpeg; if not, write to the Free Software
22 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23 */
24
25 #include <stddef.h>
26
27 #include "libavutil/intreadwrite.h"
28 #include "libavutil/internal.h"
29 #include "libavutil/macros.h"
30 #include "libavutil/mem.h"
31 #include "libavformat/internal.h"
32 #include "avformat.h"
33 #include "demux.h"
34
35 #define SCD_MAGIC ((uint64_t)MKBETAG('S', 'E', 'D', 'B') << 32 | \
36 MKBETAG('S', 'S', 'C', 'F'))
37 #define SCD_MIN_HEADER_SIZE 20
38 #define SCD_OFFSET_HEADER_SIZE 28
39 #define SCD_TRACK_HEADER_SIZE 32
40
41 #define SCD_TRACK_ID_PCM 0
42 #define SCD_TRACK_ID_OGG 6
43 #define SCD_TRACK_ID_MP3 7
44 #define SCD_TRACK_ID_MS_ADPCM 12
45
46 typedef struct SCDOffsetTable {
47 uint16_t count;
48 uint32_t offset;
49 uint32_t *entries;
50 } SCDOffsetTable;
51
52 typedef struct SCDHeader {
53 uint64_t magic; /* SEDBSSCF */
54 uint32_t version; /* Verison number. We only know about 3. */
55 uint16_t unk1; /* Unknown, 260 in Drakengard 3, 1024 in FFXIV. */
56 uint16_t header_size; /* Total size of this header. */
57 uint32_t file_size; /* Is often 0, just ignore it. */
58
59 SCDOffsetTable table0; /* Table 0, no idea. 56 uint32's/entry. */
60 SCDOffsetTable table1; /* Table 1, contains the track info. */
61 SCDOffsetTable table2; /* Table 2, no idea. 40 uint32's/entry. */
62 uint16_t unk2; /* Unknown, not a count. */
63 uint32_t unk3; /* Unknown, not an offset. */
64 uint32_t unk4; /* Unknown, offset to offset. */
65 } SCDHeader;
66
67 typedef struct SCDTrackHeader {
68 uint32_t length;
69 uint32_t num_channels;
70 uint32_t sample_rate;
71 uint32_t data_type;
72 uint32_t loop_start;
73 uint32_t loop_end;
74 uint32_t data_offset; /* Offset to data + this header. */
75 uint32_t aux_count;
76
77 uint32_t absolute_offset;
78 uint32_t bytes_read;
79 } SCDTrackHeader;
80
81 typedef struct SCDDemuxContext {
82 SCDHeader hdr;
83 SCDTrackHeader *tracks;
84 int current_track;
85 } SCDDemuxContext;
86
87 7236 static int scd_probe(const AVProbeData *p)
88 {
89
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 7236 if (AV_RB64(p->buf) != SCD_MAGIC)
90 7236 return 0;
91
92 ✗ return AVPROBE_SCORE_MAX;
93 }
94
95 ✗ static int scd_read_table(AVFormatContext *s, SCDOffsetTable *table)
96 {
97 int64_t ret;
98
99 ✗ if ((ret = avio_seek(s->pb, table->offset, SEEK_SET)) < 0)
100 ✗ return ret;
101
102 ✗ if ((table->entries = av_calloc(table->count, sizeof(uint32_t))) == NULL)
103 ✗ return ret;
104
105 ✗ if ((ret = avio_read(s->pb, (unsigned char*)table->entries, table->count * sizeof(uint32_t))) < 0)
106 ✗ return ret;
107
108 ✗ for (size_t i = 0; i < table->count; i++)
109 ✗ table->entries[i] = AV_RB32(table->entries + i);
110
111 ✗ av_log(s, AV_LOG_TRACE, "Table, size = %u, offset = %u\n", table->count, table->offset);
112 ✗ for (size_t i = 0; i < table->count; i++)
113 ✗ av_log(s, AV_LOG_TRACE, " [%02zu]: %u\n", i, table->entries[i]);
114
115 ✗ return 0;
116 }
117
118 ✗ static int scd_read_offsets(AVFormatContext *s)
119 {
120 int64_t ret;
121 ✗ SCDDemuxContext *ctx = s->priv_data;
122 uint8_t buf[SCD_OFFSET_HEADER_SIZE];
123
124 ✗ if ((ret = avio_read(s->pb, buf, SCD_OFFSET_HEADER_SIZE)) < 0)
125 ✗ return ret;
126
127 ✗ ctx->hdr.table0.count = AV_RB16(buf + 0);
128 ✗ ctx->hdr.table1.count = AV_RB16(buf + 2);
129 ✗ ctx->hdr.table2.count = AV_RB16(buf + 4);
130 ✗ ctx->hdr.unk2 = AV_RB16(buf + 6);
131 ✗ ctx->hdr.table0.offset = AV_RB32(buf + 8);
132 ✗ ctx->hdr.table1.offset = AV_RB32(buf + 12);
133 ✗ ctx->hdr.table2.offset = AV_RB32(buf + 16);
134 ✗ ctx->hdr.unk3 = AV_RB32(buf + 20);
135 ✗ ctx->hdr.unk4 = AV_RB32(buf + 24);
136
137 ✗ if ((ret = scd_read_table(s, &ctx->hdr.table0)) < 0)
138 ✗ return ret;
139
140 ✗ if ((ret = scd_read_table(s, &ctx->hdr.table1)) < 0)
141 ✗ return ret;
142
143 ✗ if ((ret = scd_read_table(s, &ctx->hdr.table2)) < 0)
144 ✗ return ret;
145
146 ✗ return 0;
147 }
148
149 ✗ static int scd_read_track(AVFormatContext *s, SCDTrackHeader *track, int index)
150 {
151 int64_t ret;
152 uint32_t hoffset;
153 AVStream *st;
154 AVCodecParameters *par;
155 ✗ SCDDemuxContext *ctx = s->priv_data;
156 uint8_t buf[SCD_TRACK_HEADER_SIZE];
157
158 /* Mark as experimental until I find more files from more than just one game. */
159 ✗ if (s->strict_std_compliance > FF_COMPLIANCE_EXPERIMENTAL) {
160 ✗ av_log(s, AV_LOG_ERROR, "SCD demuxing is experimental, "
161 "add '-strict %d' if you want to use it.\n",
162 FF_COMPLIANCE_EXPERIMENTAL);
163 ✗ return AVERROR_EXPERIMENTAL;
164 }
165
166 ✗ hoffset = ctx->hdr.table1.entries[index];
167
168 ✗ if ((ret = avio_seek(s->pb, hoffset, SEEK_SET)) < 0)
169 ✗ return ret;
170
171 ✗ if ((ret = avio_read(s->pb, buf, SCD_TRACK_HEADER_SIZE)) < 0)
172 ✗ return ret;
173
174 ✗ track->length = AV_RB32(buf + 0);
175 ✗ track->num_channels = AV_RB32(buf + 4);
176 ✗ track->sample_rate = AV_RB32(buf + 8);
177 ✗ track->data_type = AV_RB32(buf + 12);
178 ✗ track->loop_start = AV_RB32(buf + 16);
179 ✗ track->loop_end = AV_RB32(buf + 20);
180 ✗ track->data_offset = AV_RB32(buf + 24);
181 ✗ track->aux_count = AV_RB32(buf + 28);
182
183 /* Sanity checks */
184 ✗ if (track->num_channels > 8 || track->sample_rate >= 192000 ||
185 ✗ track->loop_start > track->loop_end)
186 ✗ return AVERROR_INVALIDDATA;
187
188 ✗ track->absolute_offset = hoffset + SCD_TRACK_HEADER_SIZE + track->data_offset;
189 ✗ track->bytes_read = 0;
190
191 /* Not sure what to do with these, it seems to be fine to ignore them. */
192 ✗ if (track->aux_count != 0)
193 ✗ av_log(s, AV_LOG_DEBUG, "[%d] Track has %u auxiliary chunk(s).\n", index, track->aux_count);
194
195 ✗ if ((st = avformat_new_stream(s, NULL)) == NULL)
196 ✗ return AVERROR(ENOMEM);
197
198 ✗ par = st->codecpar;
199 ✗ par->codec_type = AVMEDIA_TYPE_AUDIO;
200 ✗ par->ch_layout.nb_channels = (int)track->num_channels;
201 ✗ par->sample_rate = (int)track->sample_rate;
202 ✗ st->index = index;
203 ✗ st->start_time = 0;
204
205 /* TODO: Check this with other types. Drakengard 3 MP3s have 47999 instead of 48000. */
206 ✗ if (track->data_type == SCD_TRACK_ID_MP3)
207 ✗ par->sample_rate += 1;
208
209 ✗ avpriv_set_pts_info(st, 64, 1, par->sample_rate);
210
211 ✗ if (av_dict_set_int(&st->metadata, "start", track->absolute_offset, 0) < 0)
212 ✗ return AVERROR(ENOMEM);
213
214 ✗ if (av_dict_set_int(&st->metadata, "loop_start", track->loop_start, 0) < 0)
215 ✗ return AVERROR(ENOMEM);
216
217 ✗ if (av_dict_set_int(&st->metadata, "loop_end", track->loop_end, 0) < 0)
218 ✗ return AVERROR(ENOMEM);
219
220 ✗ switch(track->data_type) {
221 ✗ case SCD_TRACK_ID_PCM:
222 ✗ par->codec_id = AV_CODEC_ID_PCM_S16BE;
223 ✗ par->bits_per_coded_sample = 16;
224 ✗ par->block_align = par->bits_per_coded_sample * par->ch_layout.nb_channels / 8;
225 ✗ break;
226 ✗ case SCD_TRACK_ID_MP3:
227 ✗ par->codec_id = AV_CODEC_ID_MP3;
228 ✗ ffstream(st)->need_parsing = AVSTREAM_PARSE_FULL_RAW;
229 ✗ break;
230 ✗ case SCD_TRACK_ID_OGG:
231 case SCD_TRACK_ID_MS_ADPCM:
232 default:
233 ✗ par->codec_id = AV_CODEC_ID_NONE;
234 ✗ avpriv_request_sample(s, "data type %u", track->data_type);
235 }
236
237 ✗ return 0;
238 }
239
240 ✗ static int scd_read_header(AVFormatContext *s)
241 {
242 int64_t ret;
243 ✗ SCDDemuxContext *ctx = s->priv_data;
244 uint8_t buf[SCD_MIN_HEADER_SIZE];
245
246 ✗ if ((ret = avio_read(s->pb, buf, SCD_MIN_HEADER_SIZE)) < 0)
247 ✗ return ret;
248
249 ✗ ctx->hdr.magic = AV_RB64(buf + 0);
250 ✗ ctx->hdr.version = AV_RB32(buf + 8);
251 ✗ ctx->hdr.unk1 = AV_RB16(buf + 12);
252 ✗ ctx->hdr.header_size = AV_RB16(buf + 14);
253 ✗ ctx->hdr.file_size = AV_RB32(buf + 16);
254
255 ✗ if (ctx->hdr.magic != SCD_MAGIC)
256 ✗ return AVERROR_INVALIDDATA;
257
258 ✗ if (ctx->hdr.version != 3) {
259 ✗ avpriv_request_sample(s, "SCD version %u", ctx->hdr.version);
260 ✗ return AVERROR_PATCHWELCOME;
261 }
262
263 ✗ if (ctx->hdr.header_size < SCD_MIN_HEADER_SIZE)
264 ✗ return AVERROR_INVALIDDATA;
265
266 ✗ if ((ret = avio_skip(s->pb, ctx->hdr.header_size - SCD_MIN_HEADER_SIZE)) < 0)
267 ✗ return ret;
268
269 ✗ if ((ret = scd_read_offsets(s)) < 0)
270 ✗ return ret;
271
272 ✗ ctx->tracks = av_calloc(ctx->hdr.table1.count, sizeof(SCDTrackHeader));
273 ✗ if (ctx->tracks == NULL)
274 ✗ return AVERROR(ENOMEM);
275
276 ✗ for (int i = 0; i < ctx->hdr.table1.count; i++) {
277 ✗ if ((ret = scd_read_track(s, ctx->tracks + i, i)) < 0)
278 ✗ return ret;
279 }
280
281 ✗ if (ctx->hdr.table1.count == 0)
282 ✗ return 0;
283
284 ✗ if ((ret = avio_seek(s->pb, ctx->tracks[0].absolute_offset, SEEK_SET)) < 0)
285 ✗ return ret;
286
287 ✗ return 0;
288 }
289
290 ✗ static int scd_read_packet(AVFormatContext *s, AVPacket *pkt)
291 {
292 ✗ SCDDemuxContext *ctx = s->priv_data;
293 AVCodecParameters *par;
294
295 /* Streams aren't interleaved, round-robin them. */
296 ✗ for (int i = 0; i < ctx->hdr.table1.count; i++) {
297 int64_t ret;
298 int size;
299 SCDTrackHeader *trk;
300
301 ✗ ctx->current_track %= ctx->hdr.table1.count;
302
303 ✗ trk = ctx->tracks + ctx->current_track;
304 ✗ par = s->streams[ctx->current_track]->codecpar;
305
306 ✗ if (trk->bytes_read >= trk->length)
307 ✗ continue;
308
309 ✗ if ((ret = avio_seek(s->pb, trk->absolute_offset + trk->bytes_read, SEEK_SET)) < 0)
310 ✗ return ret;
311
312 ✗ switch(trk->data_type) {
313 ✗ case SCD_TRACK_ID_PCM:
314 ✗ size = par->block_align;
315 ✗ break;
316 ✗ case SCD_TRACK_ID_MP3:
317 default:
318 ✗ size = FFMIN(trk->length - trk->bytes_read, 4096);
319 ✗ break;
320 }
321
322 ✗ ret = av_get_packet(s->pb, pkt, size);
323 ✗ if (ret == AVERROR_EOF) {
324 ✗ trk->length = trk->bytes_read;
325 ✗ continue;
326 ✗ } else if (ret < 0) {
327 ✗ return ret;
328 }
329
330 ✗ if (trk->data_type == SCD_TRACK_ID_PCM) {
331 ✗ pkt->pts = trk->bytes_read / (par->ch_layout.nb_channels * sizeof(uint16_t));
332 ✗ pkt->duration = size / (par->ch_layout.nb_channels * sizeof(int16_t));
333 }
334
335 ✗ trk->bytes_read += ret;
336 ✗ pkt->flags &= ~AV_PKT_FLAG_CORRUPT;
337 ✗ pkt->stream_index = ctx->current_track;
338
339 ✗ ctx->current_track++;
340 ✗ return 0;
341 }
342
343 ✗ return AVERROR_EOF;
344 }
345
346 ✗ static int scd_seek(AVFormatContext *s, int stream_index,
347 int64_t pts, int flags)
348 {
349 ✗ SCDDemuxContext *ctx = s->priv_data;
350
351 ✗ if (pts != 0)
352 ✗ return AVERROR(EINVAL);
353
354 ✗ for(int i = 0; i < ctx->hdr.table1.count; ++i)
355 ✗ ctx->tracks[i].bytes_read = 0;
356
357 ✗ return 0;
358 }
359
360 ✗ static int scd_read_close(AVFormatContext *s)
361 {
362 ✗ SCDDemuxContext *ctx = s->priv_data;
363
364 ✗ av_freep(&ctx->hdr.table0.entries);
365 ✗ av_freep(&ctx->hdr.table1.entries);
366 ✗ av_freep(&ctx->hdr.table2.entries);
367 ✗ av_freep(&ctx->tracks);
368 ✗ return 0;
369 }
370
371 const FFInputFormat ff_scd_demuxer = {
372 .p.name = "scd",
373 .p.long_name = NULL_IF_CONFIG_SMALL("Square Enix SCD"),
374 .priv_data_size = sizeof(SCDDemuxContext),
375 .flags_internal = FF_INFMT_FLAG_INIT_CLEANUP,
376 .read_probe = scd_probe,
377 .read_header = scd_read_header,
378 .read_packet = scd_read_packet,
379 .read_seek = scd_seek,
380 .read_close = scd_read_close,
381 };
382