aboutsummaryrefslogtreecommitdiffstats
path: root/libavformat/argo_cvg.c
blob: 03ae6fa59e9be09dc13bb2010214bec24293b149 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
/*
 * Argonaut Games CVG (de)muxer
 *
 * Copyright (C) 2021 Zane van Iperen (zane@zanevaniperen.com)
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include "config_components.h"

#include "libavutil/avstring.h"
#include "libavutil/channel_layout.h"
#include "avformat.h"
#include "demux.h"
#include "internal.h"
#include "mux.h"
#include "libavutil/opt.h"
#include "libavutil/intreadwrite.h"

/*
 * .CVG files are essentially PSX ADPCM wrapped with a size and checksum.
 * Found in the PSX versions of the game.
 */

#define ARGO_CVG_HEADER_SIZE        12
#define ARGO_CVG_BLOCK_ALIGN        0x10
#define ARGO_CVG_NB_BLOCKS          32
#define ARGO_CVG_SAMPLES_PER_BLOCK  28

typedef struct ArgoCVGHeader {
    uint32_t size;   /*< File size -8 (this + trailing checksum) */
    uint32_t loop;   /*< Loop flag. */
    uint32_t reverb; /*< Reverb flag. */
} ArgoCVGHeader;

typedef struct ArgoCVGDemuxContext {
    ArgoCVGHeader header;
    uint32_t      checksum;
    uint32_t      num_blocks;
    uint32_t      blocks_read;
} ArgoCVGDemuxContext;

typedef struct ArgoCVGMuxContext {
    const AVClass *class;
    int           skip_rate_check;
    int           loop;
    int           reverb;
    uint32_t      checksum;
    size_t        size;
} ArgoCVGMuxContext;

#if CONFIG_ARGO_CVG_DEMUXER
/* "Special" files that are played at a different rate. */
//  FILE(NAME, SIZE, LOOP, REVERB, CHECKSUM, SAMPLE_RATE)
#define OVERRIDE_FILES(FILE)                               \
    FILE(CRYS,     23592, 0, 1, 2495499, 88200) /* Beta */ \
    FILE(REDCRY88, 38280, 0, 1, 4134848, 88200) /* Beta */ \
    FILE(DANLOOP1, 54744, 1, 0, 5684641, 37800) /* Beta */ \
    FILE(PICKUP88, 12904, 0, 1, 1348091, 48000) /* Beta */ \
    FILE(SELECT1,   5080, 0, 1,  549987, 44100) /* Beta */ \

#define MAX_FILENAME_SIZE(NAME, SIZE, LOOP, REVERB, CHECKSUM, SAMPLE_RATE) \
    MAX_SIZE_BEFORE_ ## NAME,                                  \
    MAX_SIZE_UNTIL_ ## NAME ## _MINUS1 = FFMAX(sizeof(#NAME ".CVG"), MAX_SIZE_BEFORE_ ## NAME) - 1,
enum {
    OVERRIDE_FILES(MAX_FILENAME_SIZE)
    MAX_OVERRIDE_FILENAME_SIZE
};

typedef struct ArgoCVGOverride {
    const char    name[MAX_OVERRIDE_FILENAME_SIZE];
    ArgoCVGHeader header;
    uint32_t      checksum;
    int           sample_rate;
} ArgoCVGOverride;

#define FILE(NAME, SIZE, LOOP, REVERB, CHECKSUM, SAMPLE_RATE) \
    { #NAME ".CVG", { SIZE, LOOP, REVERB }, CHECKSUM, SAMPLE_RATE },
static const ArgoCVGOverride overrides[] = {
    OVERRIDE_FILES(FILE)
};

static int argo_cvg_probe(const AVProbeData *p)
{
    ArgoCVGHeader cvg;

    /*
     * It's almost impossible to detect these files based
     * on the header alone. File extension is (unfortunately)
     * the best way forward.
     */
    if (!av_match_ext(p->filename, "cvg"))
        return 0;

    if (p->buf_size < ARGO_CVG_HEADER_SIZE)
        return 0;

    cvg.size   = AV_RL32(p->buf + 0);
    cvg.loop   = AV_RL32(p->buf + 4);
    cvg.reverb = AV_RL32(p->buf + 8);

    if (cvg.size < 8)
        return 0;

    if (cvg.loop != 0 && cvg.loop != 1)
        return 0;

    if (cvg.reverb != 0 && cvg.reverb != 1)
        return 0;

    return AVPROBE_SCORE_MAX / 4 + 1;
}

static int argo_cvg_read_checksum(AVIOContext *pb, const ArgoCVGHeader *cvg, uint32_t *checksum)
{
    int ret;
    uint8_t buf[4];

    if (!(pb->seekable & AVIO_SEEKABLE_NORMAL)) {
        *checksum = 0;
        return 0;
    }

    if ((ret = avio_seek(pb, cvg->size + 4, SEEK_SET)) < 0)
        return ret;

    /* NB: Not using avio_rl32() because no error checking. */
    if ((ret = avio_read(pb, buf, sizeof(buf))) < 0)
        return ret;
    else if (ret != sizeof(buf))
        return AVERROR(EIO);

    if ((ret = avio_seek(pb, ARGO_CVG_HEADER_SIZE, SEEK_SET)) < 0)
        return ret;

    *checksum = AV_RL32(buf);
    return 0;
}

static int argo_cvg_read_header(AVFormatContext *s)
{
    int ret;
    AVStream *st;
    AVCodecParameters *par;
    uint8_t buf[ARGO_CVG_HEADER_SIZE];
    const char *filename = av_basename(s->url);
    ArgoCVGDemuxContext *ctx = s->priv_data;

    if (!(st = avformat_new_stream(s, NULL)))
        return AVERROR(ENOMEM);

    if ((ret = avio_read(s->pb, buf, ARGO_CVG_HEADER_SIZE)) < 0)
        return ret;
    else if (ret != ARGO_CVG_HEADER_SIZE)
        return AVERROR(EIO);

    ctx->header.size   = AV_RL32(buf + 0);
    ctx->header.loop   = AV_RL32(buf + 4);
    ctx->header.reverb = AV_RL32(buf + 8);

    if (ctx->header.size < 8)
        return AVERROR_INVALIDDATA;

    if ((ret = argo_cvg_read_checksum(s->pb, &ctx->header, &ctx->checksum)) < 0)
        return ret;

    if ((ret = av_dict_set_int(&st->metadata, "loop", ctx->header.loop, 0)) < 0)
        return ret;

    if ((ret = av_dict_set_int(&st->metadata, "reverb", ctx->header.reverb, 0)) < 0)
        return ret;

    if ((ret = av_dict_set_int(&st->metadata, "checksum", ctx->checksum, 0)) < 0)
        return ret;

    par                         = st->codecpar;
    par->codec_type             = AVMEDIA_TYPE_AUDIO;
    par->codec_id               = AV_CODEC_ID_ADPCM_PSX;
    par->sample_rate            = 22050;

    for (size_t i = 0; i < FF_ARRAY_ELEMS(overrides); i++) {
        const ArgoCVGOverride *ovr = overrides + i;
        if (ovr->header.size   != ctx->header.size ||
            ovr->header.loop   != ctx->header.loop ||
            ovr->header.reverb != ctx->header.reverb ||
            ovr->checksum      != ctx->checksum    ||
            av_strcasecmp(filename, ovr->name) != 0)
            continue;

        av_log(s, AV_LOG_TRACE, "found override, name = %s\n", ovr->name);
        par->sample_rate = ovr->sample_rate;
        break;
    }

    par->ch_layout              = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO;

    par->bits_per_coded_sample  = 4;
    par->block_align            = ARGO_CVG_BLOCK_ALIGN;
    par->bit_rate               = par->sample_rate * par->bits_per_coded_sample;

    ctx->num_blocks = (ctx->header.size - 8) / ARGO_CVG_BLOCK_ALIGN;

    av_log(s, AV_LOG_TRACE, "num blocks = %u\n", ctx->num_blocks);

    avpriv_set_pts_info(st, 64, 1, par->sample_rate);

    st->start_time = 0;
    st->duration   = ctx->num_blocks * ARGO_CVG_SAMPLES_PER_BLOCK;
    st->nb_frames  = ctx->num_blocks;
    return 0;
}

static int argo_cvg_read_packet(AVFormatContext *s, AVPacket *pkt)
{
    int ret;
    AVStream *st = s->streams[0];
    ArgoCVGDemuxContext *ctx = s->priv_data;

    if (ctx->blocks_read >= ctx->num_blocks)
        return AVERROR_EOF;

    ret = av_get_packet(s->pb, pkt, st->codecpar->block_align *
                        FFMIN(ARGO_CVG_NB_BLOCKS, ctx->num_blocks - ctx->blocks_read));

    if (ret < 0)
        return ret;

    if (ret % st->codecpar->block_align != 0)
        return AVERROR_INVALIDDATA;

    pkt->stream_index   = 0;
    pkt->duration       = ARGO_CVG_SAMPLES_PER_BLOCK * (ret / st->codecpar->block_align);
    pkt->pts            = ctx->blocks_read * ARGO_CVG_SAMPLES_PER_BLOCK;
    pkt->flags         &= ~AV_PKT_FLAG_CORRUPT;

    ctx->blocks_read   += ret / st->codecpar->block_align;

    return 0;
}

static int argo_cvg_seek(AVFormatContext *s, int stream_index,
                        int64_t pts, int flags)
{
    int64_t ret;
    ArgoCVGDemuxContext *ctx = s->priv_data;

    if (pts != 0 || stream_index != 0)
        return AVERROR(EINVAL);

    if ((ret = avio_seek(s->pb, ARGO_CVG_HEADER_SIZE, SEEK_SET)) < 0)
        return ret;

    ctx->blocks_read = 0;
    return 0;
}

const FFInputFormat ff_argo_cvg_demuxer = {
    .p.name         = "argo_cvg",
    .p.long_name    = NULL_IF_CONFIG_SMALL("Argonaut Games CVG"),
    .priv_data_size = sizeof(ArgoCVGDemuxContext),
    .read_probe     = argo_cvg_probe,
    .read_header    = argo_cvg_read_header,
    .read_packet    = argo_cvg_read_packet,
    .read_seek      = argo_cvg_seek,
};
#endif

#if CONFIG_ARGO_CVG_MUXER
static int argo_cvg_write_init(AVFormatContext *s)
{
    ArgoCVGMuxContext *ctx = s->priv_data;
    const AVCodecParameters *par = s->streams[0]->codecpar;

    if (par->ch_layout.nb_channels != 1) {
        av_log(s, AV_LOG_ERROR, "CVG files only support 1 channel\n");
        return AVERROR(EINVAL);
    }

    if (par->block_align != ARGO_CVG_BLOCK_ALIGN)
        return AVERROR(EINVAL);

    if (!ctx->skip_rate_check && par->sample_rate != 22050) {
        av_log(s, AV_LOG_ERROR, "Sample rate must be 22050\n");
        return AVERROR(EINVAL);
    }

    if (!(s->pb->seekable & AVIO_SEEKABLE_NORMAL)) {
        av_log(s, AV_LOG_ERROR, "Stream not seekable, unable to write output file\n");
        return AVERROR(EINVAL);
    }

    return 0;
}

static int argo_cvg_write_header(AVFormatContext *s)
{
    ArgoCVGMuxContext *ctx = s->priv_data;

    avio_wl32(s->pb, 0); /* Size, fixed later. */
    avio_wl32(s->pb, !!ctx->loop);
    avio_wl32(s->pb, !!ctx->reverb);

    ctx->checksum = !!ctx->loop + !!ctx->reverb;
    ctx->size     = 8;
    return 0;
}

static int argo_cvg_write_packet(AVFormatContext *s, AVPacket *pkt)
{
    ArgoCVGMuxContext *ctx = s->priv_data;
    AVCodecParameters *par = s->streams[0]->codecpar;

    if (pkt->size % par->block_align != 0)
        return AVERROR_INVALIDDATA;

    avio_write(s->pb, pkt->data, pkt->size);

    ctx->size += pkt->size;

    if (ctx->size > UINT32_MAX)
        return AVERROR_INVALIDDATA;

    for (int i = 0; i < pkt->size; i++)
        ctx->checksum += pkt->data[i];

    return 0;
}

static int argo_cvg_write_trailer(AVFormatContext *s)
{
    ArgoCVGMuxContext *ctx = s->priv_data;
    int64_t ret;

    ctx->checksum +=  (ctx->size      & 255)
                   + ((ctx->size>> 8) & 255)
                   + ((ctx->size>>16) & 255)
                   +  (ctx->size>>24);

    av_log(s, AV_LOG_TRACE, "size     = %zu\n", ctx->size);
    av_log(s, AV_LOG_TRACE, "checksum = %u\n",  ctx->checksum);

    avio_wl32(s->pb, ctx->checksum);

    if ((ret = avio_seek(s->pb, 0, SEEK_SET)) < 0)
        return ret;

    avio_wl32(s->pb, (uint32_t)ctx->size);
    return 0;
}

static const AVOption argo_cvg_options[] = {
    {
        .name        = "skip_rate_check",
        .help        = "skip sample rate check",
        .offset      = offsetof(ArgoCVGMuxContext, skip_rate_check),
        .type        = AV_OPT_TYPE_BOOL,
        .default_val = {.i64 = 0},
        .min         = 0,
        .max         = 1,
        .flags       = AV_OPT_FLAG_ENCODING_PARAM
    },
    {
        .name        = "loop",
        .help        = "set loop flag",
        .offset      = offsetof(ArgoCVGMuxContext, loop),
        .type        = AV_OPT_TYPE_BOOL,
        .default_val = {.i64 = 0},
        .min         = 0,
        .max         = 1,
        .flags       = AV_OPT_FLAG_ENCODING_PARAM
    },
        {
        .name        = "reverb",
        .help        = "set reverb flag",
        .offset      = offsetof(ArgoCVGMuxContext, reverb),
        .type        = AV_OPT_TYPE_BOOL,
        .default_val = {.i64 = 1},
        .min         = 0,
        .max         = 1,
        .flags       = AV_OPT_FLAG_ENCODING_PARAM
    },
    { NULL }
};

static const AVClass argo_cvg_muxer_class = {
    .class_name = "argo_cvg_muxer",
    .item_name  = av_default_item_name,
    .option     = argo_cvg_options,
    .version    = LIBAVUTIL_VERSION_INT
};

const FFOutputFormat ff_argo_cvg_muxer = {
    .p.name         = "argo_cvg",
    .p.long_name    = NULL_IF_CONFIG_SMALL("Argonaut Games CVG"),
    .p.extensions   = "cvg",
    .p.audio_codec  = AV_CODEC_ID_ADPCM_PSX,
    .p.video_codec  = AV_CODEC_ID_NONE,
    .p.subtitle_codec = AV_CODEC_ID_NONE,
    .p.priv_class   = &argo_cvg_muxer_class,
    .flags_internal   = FF_OFMT_FLAG_MAX_ONE_OF_EACH |
                        FF_OFMT_FLAG_ONLY_DEFAULT_CODECS,
    .init           = argo_cvg_write_init,
    .write_header   = argo_cvg_write_header,
    .write_packet   = argo_cvg_write_packet,
    .write_trailer  = argo_cvg_write_trailer,
    .priv_data_size = sizeof(ArgoCVGMuxContext),
};
#endif