aboutsummaryrefslogtreecommitdiffstats
path: root/libavformat/ape.c
blob: c06db7848083192a1af3d4d047586d326013ba73 (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
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
/*
 * Monkey's Audio APE demuxer
 * Copyright (c) 2007 Benjamin Zores <ben@geexbox.org>
 *  based upon libdemac from Dave Chapman.
 *
 * 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 <stdio.h>

#include "libavutil/intreadwrite.h"
#include "avformat.h"
#include "internal.h"
#include "apetag.h"

/* The earliest and latest file formats supported by this library */
#define APE_MIN_VERSION 3800
#define APE_MAX_VERSION 3990

#define MAC_FORMAT_FLAG_8_BIT                 1 // is 8-bit [OBSOLETE]
#define MAC_FORMAT_FLAG_CRC                   2 // uses the new CRC32 error detection [OBSOLETE]
#define MAC_FORMAT_FLAG_HAS_PEAK_LEVEL        4 // uint32 nPeakLevel after the header [OBSOLETE]
#define MAC_FORMAT_FLAG_24_BIT                8 // is 24-bit [OBSOLETE]
#define MAC_FORMAT_FLAG_HAS_SEEK_ELEMENTS    16 // has the number of seek elements after the peak level
#define MAC_FORMAT_FLAG_CREATE_WAV_HEADER    32 // create the wave header on decompression (not stored)

#define APE_EXTRADATA_SIZE 6

typedef struct APEFrame {
    int64_t pos;
    int nblocks;
    int size;
    int skip;
    int64_t pts;
} APEFrame;

typedef struct APEContext {
    /* Derived fields */
    uint32_t junklength;
    uint32_t firstframe;
    uint32_t totalsamples;
    int currentframe;
    APEFrame *frames;

    /* Info from Descriptor Block */
    int16_t fileversion;
    int16_t padding1;
    uint32_t descriptorlength;
    uint32_t headerlength;
    uint32_t seektablelength;
    uint32_t wavheaderlength;
    uint32_t audiodatalength;
    uint32_t audiodatalength_high;
    uint32_t wavtaillength;
    uint8_t md5[16];

    /* Info from Header Block */
    uint16_t compressiontype;
    uint16_t formatflags;
    uint32_t blocksperframe;
    uint32_t finalframeblocks;
    uint32_t totalframes;
    uint16_t bps;
    uint16_t channels;
    uint32_t samplerate;

    /* Seektable */
    uint32_t *seektable;
    uint8_t  *bittable;
} APEContext;

static int ape_probe(AVProbeData * p)
{
    int version = AV_RL16(p->buf+4);
    if (AV_RL32(p->buf) != MKTAG('M', 'A', 'C', ' '))
        return 0;

    if (version < APE_MIN_VERSION || version > APE_MAX_VERSION)
        return AVPROBE_SCORE_MAX/4;

    return AVPROBE_SCORE_MAX;
}

static void ape_dumpinfo(AVFormatContext * s, APEContext * ape_ctx)
{
#ifdef DEBUG
    int i;

    av_log(s, AV_LOG_DEBUG, "Descriptor Block:\n\n");
    av_log(s, AV_LOG_DEBUG, "fileversion          = %"PRId16"\n", ape_ctx->fileversion);
    av_log(s, AV_LOG_DEBUG, "descriptorlength     = %"PRIu32"\n", ape_ctx->descriptorlength);
    av_log(s, AV_LOG_DEBUG, "headerlength         = %"PRIu32"\n", ape_ctx->headerlength);
    av_log(s, AV_LOG_DEBUG, "seektablelength      = %"PRIu32"\n", ape_ctx->seektablelength);
    av_log(s, AV_LOG_DEBUG, "wavheaderlength      = %"PRIu32"\n", ape_ctx->wavheaderlength);
    av_log(s, AV_LOG_DEBUG, "audiodatalength      = %"PRIu32"\n", ape_ctx->audiodatalength);
    av_log(s, AV_LOG_DEBUG, "audiodatalength_high = %"PRIu32"\n", ape_ctx->audiodatalength_high);
    av_log(s, AV_LOG_DEBUG, "wavtaillength        = %"PRIu32"\n", ape_ctx->wavtaillength);
    av_log(s, AV_LOG_DEBUG, "md5                  = ");
    for (i = 0; i < 16; i++)
         av_log(s, AV_LOG_DEBUG, "%02x", ape_ctx->md5[i]);
    av_log(s, AV_LOG_DEBUG, "\n");

    av_log(s, AV_LOG_DEBUG, "\nHeader Block:\n\n");

    av_log(s, AV_LOG_DEBUG, "compressiontype      = %"PRIu16"\n", ape_ctx->compressiontype);
    av_log(s, AV_LOG_DEBUG, "formatflags          = %"PRIu16"\n", ape_ctx->formatflags);
    av_log(s, AV_LOG_DEBUG, "blocksperframe       = %"PRIu32"\n", ape_ctx->blocksperframe);
    av_log(s, AV_LOG_DEBUG, "finalframeblocks     = %"PRIu32"\n", ape_ctx->finalframeblocks);
    av_log(s, AV_LOG_DEBUG, "totalframes          = %"PRIu32"\n", ape_ctx->totalframes);
    av_log(s, AV_LOG_DEBUG, "bps                  = %"PRIu16"\n", ape_ctx->bps);
    av_log(s, AV_LOG_DEBUG, "channels             = %"PRIu16"\n", ape_ctx->channels);
    av_log(s, AV_LOG_DEBUG, "samplerate           = %"PRIu32"\n", ape_ctx->samplerate);

    av_log(s, AV_LOG_DEBUG, "\nSeektable\n\n");
    if ((ape_ctx->seektablelength / sizeof(uint32_t)) != ape_ctx->totalframes) {
        av_log(s, AV_LOG_DEBUG, "No seektable\n");
    } else {
        for (i = 0; i < ape_ctx->seektablelength / sizeof(uint32_t); i++) {
            if (i < ape_ctx->totalframes - 1) {
                av_log(s, AV_LOG_DEBUG, "%8d   %"PRIu32" (%"PRIu32" bytes)",
                       i, ape_ctx->seektable[i],
                       ape_ctx->seektable[i + 1] - ape_ctx->seektable[i]);
                if (ape_ctx->bittable)
                    av_log(s, AV_LOG_DEBUG, " + %2d bits\n",
                           ape_ctx->bittable[i]);
                av_log(s, AV_LOG_DEBUG, "\n");
            } else {
                av_log(s, AV_LOG_DEBUG, "%8d   %"PRIu32"\n", i, ape_ctx->seektable[i]);
            }
        }
    }

    av_log(s, AV_LOG_DEBUG, "\nFrames\n\n");
    for (i = 0; i < ape_ctx->totalframes; i++)
        av_log(s, AV_LOG_DEBUG, "%8d   %8"PRId64" %8d (%d samples)\n", i,
               ape_ctx->frames[i].pos, ape_ctx->frames[i].size,
               ape_ctx->frames[i].nblocks);

    av_log(s, AV_LOG_DEBUG, "\nCalculated information:\n\n");
    av_log(s, AV_LOG_DEBUG, "junklength           = %"PRIu32"\n", ape_ctx->junklength);
    av_log(s, AV_LOG_DEBUG, "firstframe           = %"PRIu32"\n", ape_ctx->firstframe);
    av_log(s, AV_LOG_DEBUG, "totalsamples         = %"PRIu32"\n", ape_ctx->totalsamples);
#endif
}

static int ape_read_header(AVFormatContext * s)
{
    AVIOContext *pb = s->pb;
    APEContext *ape = s->priv_data;
    AVStream *st;
    uint32_t tag;
    int i;
    int total_blocks, final_size = 0;
    int64_t pts, file_size;

    /* Skip any leading junk such as id3v2 tags */
    ape->junklength = avio_tell(pb);

    tag = avio_rl32(pb);
    if (tag != MKTAG('M', 'A', 'C', ' '))
        return AVERROR_INVALIDDATA;

    ape->fileversion = avio_rl16(pb);

    if (ape->fileversion < APE_MIN_VERSION || ape->fileversion > APE_MAX_VERSION) {
        av_log(s, AV_LOG_ERROR, "Unsupported file version - %d.%02d\n",
               ape->fileversion / 1000, (ape->fileversion % 1000) / 10);
        return AVERROR_PATCHWELCOME;
    }

    if (ape->fileversion >= 3980) {
        ape->padding1             = avio_rl16(pb);
        ape->descriptorlength     = avio_rl32(pb);
        ape->headerlength         = avio_rl32(pb);
        ape->seektablelength      = avio_rl32(pb);
        ape->wavheaderlength      = avio_rl32(pb);
        ape->audiodatalength      = avio_rl32(pb);
        ape->audiodatalength_high = avio_rl32(pb);
        ape->wavtaillength        = avio_rl32(pb);
        avio_read(pb, ape->md5, 16);

        /* Skip any unknown bytes at the end of the descriptor.
           This is for future compatibility */
        if (ape->descriptorlength > 52)
            avio_skip(pb, ape->descriptorlength - 52);

        /* Read header data */
        ape->compressiontype      = avio_rl16(pb);
        ape->formatflags          = avio_rl16(pb);
        ape->blocksperframe       = avio_rl32(pb);
        ape->finalframeblocks     = avio_rl32(pb);
        ape->totalframes          = avio_rl32(pb);
        ape->bps                  = avio_rl16(pb);
        ape->channels             = avio_rl16(pb);
        ape->samplerate           = avio_rl32(pb);
    } else {
        ape->descriptorlength = 0;
        ape->headerlength = 32;

        ape->compressiontype      = avio_rl16(pb);
        ape->formatflags          = avio_rl16(pb);
        ape->channels             = avio_rl16(pb);
        ape->samplerate           = avio_rl32(pb);
        ape->wavheaderlength      = avio_rl32(pb);
        ape->wavtaillength        = avio_rl32(pb);
        ape->totalframes          = avio_rl32(pb);
        ape->finalframeblocks     = avio_rl32(pb);

        if (ape->formatflags & MAC_FORMAT_FLAG_HAS_PEAK_LEVEL) {
            avio_skip(pb, 4); /* Skip the peak level */
            ape->headerlength += 4;
        }

        if (ape->formatflags & MAC_FORMAT_FLAG_HAS_SEEK_ELEMENTS) {
            ape->seektablelength = avio_rl32(pb);
            ape->headerlength += 4;
            ape->seektablelength *= sizeof(int32_t);
        } else
            ape->seektablelength = ape->totalframes * sizeof(int32_t);

        if (ape->formatflags & MAC_FORMAT_FLAG_8_BIT)
            ape->bps = 8;
        else if (ape->formatflags & MAC_FORMAT_FLAG_24_BIT)
            ape->bps = 24;
        else
            ape->bps = 16;

        if (ape->fileversion >= 3950)
            ape->blocksperframe = 73728 * 4;
        else if (ape->fileversion >= 3900 || (ape->fileversion >= 3800  && ape->compressiontype >= 4000))
            ape->blocksperframe = 73728;
        else
            ape->blocksperframe = 9216;

        /* Skip any stored wav header */
        if (!(ape->formatflags & MAC_FORMAT_FLAG_CREATE_WAV_HEADER))
            avio_skip(pb, ape->wavheaderlength);
    }

    if(!ape->totalframes){
        av_log(s, AV_LOG_ERROR, "No frames in the file!\n");
        return AVERROR(EINVAL);
    }
    if(ape->totalframes > UINT_MAX / sizeof(APEFrame)){
        av_log(s, AV_LOG_ERROR, "Too many frames: %"PRIu32"\n",
               ape->totalframes);
        return AVERROR_INVALIDDATA;
    }
    if (ape->seektablelength / sizeof(*ape->seektable) < ape->totalframes) {
        av_log(s, AV_LOG_ERROR,
               "Number of seek entries is less than number of frames: %"SIZE_SPECIFIER" vs. %"PRIu32"\n",
               ape->seektablelength / sizeof(*ape->seektable), ape->totalframes);
        return AVERROR_INVALIDDATA;
    }
    ape->frames       = av_malloc_array(ape->totalframes, sizeof(APEFrame));
    if(!ape->frames)
        return AVERROR(ENOMEM);
    ape->firstframe   = ape->junklength + ape->descriptorlength + ape->headerlength + ape->seektablelength + ape->wavheaderlength;
    if (ape->fileversion < 3810)
        ape->firstframe += ape->totalframes;
    ape->currentframe = 0;


    ape->totalsamples = ape->finalframeblocks;
    if (ape->totalframes > 1)
        ape->totalsamples += ape->blocksperframe * (ape->totalframes - 1);

    if (ape->seektablelength > 0) {
        ape->seektable = av_mallocz(ape->seektablelength);
        if (!ape->seektable)
            return AVERROR(ENOMEM);
        for (i = 0; i < ape->seektablelength / sizeof(uint32_t) && !pb->eof_reached; i++)
            ape->seektable[i] = avio_rl32(pb);
        if (ape->fileversion < 3810) {
            ape->bittable = av_mallocz(ape->totalframes);
            if (!ape->bittable)
                return AVERROR(ENOMEM);
            for (i = 0; i < ape->totalframes && !pb->eof_reached; i++)
                ape->bittable[i] = avio_r8(pb);
        }
        if (pb->eof_reached)
            av_log(s, AV_LOG_WARNING, "File truncated\n");
    }

    ape->frames[0].pos     = ape->firstframe;
    ape->frames[0].nblocks = ape->blocksperframe;
    ape->frames[0].skip    = 0;
    for (i = 1; i < ape->totalframes; i++) {
        ape->frames[i].pos      = ape->seektable[i] + ape->junklength;
        ape->frames[i].nblocks  = ape->blocksperframe;
        ape->frames[i - 1].size = ape->frames[i].pos - ape->frames[i - 1].pos;
        ape->frames[i].skip     = (ape->frames[i].pos - ape->frames[0].pos) & 3;
    }
    ape->frames[ape->totalframes - 1].nblocks = ape->finalframeblocks;
    /* calculate final packet size from total file size, if available */
    file_size = avio_size(pb);
    if (file_size > 0) {
        final_size = file_size - ape->frames[ape->totalframes - 1].pos -
                     ape->wavtaillength;
        final_size -= final_size & 3;
    }
    if (file_size <= 0 || final_size <= 0)
        final_size = ape->finalframeblocks * 8;
    ape->frames[ape->totalframes - 1].size = final_size;

    for (i = 0; i < ape->totalframes; i++) {
        if(ape->frames[i].skip){
            ape->frames[i].pos  -= ape->frames[i].skip;
            ape->frames[i].size += ape->frames[i].skip;
        }
        ape->frames[i].size = (ape->frames[i].size + 3) & ~3;
    }
    if (ape->fileversion < 3810) {
        for (i = 0; i < ape->totalframes; i++) {
            if (i < ape->totalframes - 1 && ape->bittable[i + 1])
                ape->frames[i].size += 4;
            ape->frames[i].skip <<= 3;
            ape->frames[i].skip  += ape->bittable[i];
        }
    }

    ape_dumpinfo(s, ape);

    av_log(s, AV_LOG_VERBOSE, "Decoding file - v%d.%02d, compression level %"PRIu16"\n",
           ape->fileversion / 1000, (ape->fileversion % 1000) / 10,
           ape->compressiontype);

    /* now we are ready: build format streams */
    st = avformat_new_stream(s, NULL);
    if (!st)
        return AVERROR(ENOMEM);

    total_blocks = (ape->totalframes == 0) ? 0 : ((ape->totalframes - 1) * ape->blocksperframe) + ape->finalframeblocks;

    st->codecpar->codec_type      = AVMEDIA_TYPE_AUDIO;
    st->codecpar->codec_id        = AV_CODEC_ID_APE;
    st->codecpar->codec_tag       = MKTAG('A', 'P', 'E', ' ');
    st->codecpar->channels        = ape->channels;
    st->codecpar->sample_rate     = ape->samplerate;
    st->codecpar->bits_per_coded_sample = ape->bps;

    st->nb_frames = ape->totalframes;
    st->start_time = 0;
    st->duration  = total_blocks;
    avpriv_set_pts_info(st, 64, 1, ape->samplerate);

    if (ff_alloc_extradata(st->codecpar, APE_EXTRADATA_SIZE))
        return AVERROR(ENOMEM);
    AV_WL16(st->codecpar->extradata + 0, ape->fileversion);
    AV_WL16(st->codecpar->extradata + 2, ape->compressiontype);
    AV_WL16(st->codecpar->extradata + 4, ape->formatflags);

    pts = 0;
    for (i = 0; i < ape->totalframes; i++) {
        ape->frames[i].pts = pts;
        av_add_index_entry(st, ape->frames[i].pos, ape->frames[i].pts, 0, 0, AVINDEX_KEYFRAME);
        pts += ape->blocksperframe;
    }

    /* try to read APE tags */
    if (pb->seekable & AVIO_SEEKABLE_NORMAL) {
        ff_ape_parse_tag(s);
        avio_seek(pb, 0, SEEK_SET);
    }

    return 0;
}

static int ape_read_packet(AVFormatContext * s, AVPacket * pkt)
{
    int ret;
    int nblocks;
    APEContext *ape = s->priv_data;
    uint32_t extra_size = 8;

    if (avio_feof(s->pb))
        return AVERROR_EOF;
    if (ape->currentframe >= ape->totalframes)
        return AVERROR_EOF;

    if (avio_seek(s->pb, ape->frames[ape->currentframe].pos, SEEK_SET) < 0)
        return AVERROR(EIO);

    /* Calculate how many blocks there are in this frame */
    if (ape->currentframe == (ape->totalframes - 1))
        nblocks = ape->finalframeblocks;
    else
        nblocks = ape->blocksperframe;

    if (ape->frames[ape->currentframe].size <= 0 ||
        ape->frames[ape->currentframe].size > INT_MAX - extra_size) {
        av_log(s, AV_LOG_ERROR, "invalid packet size: %d\n",
               ape->frames[ape->currentframe].size);
        ape->currentframe++;
        return AVERROR(EIO);
    }

    if (av_new_packet(pkt,  ape->frames[ape->currentframe].size + extra_size) < 0)
        return AVERROR(ENOMEM);

    AV_WL32(pkt->data    , nblocks);
    AV_WL32(pkt->data + 4, ape->frames[ape->currentframe].skip);
    ret = avio_read(s->pb, pkt->data + extra_size, ape->frames[ape->currentframe].size);
    if (ret < 0) {
        av_packet_unref(pkt);
        return ret;
    }

    pkt->pts = ape->frames[ape->currentframe].pts;
    pkt->stream_index = 0;

    /* note: we need to modify the packet size here to handle the last
       packet */
    pkt->size = ret + extra_size;

    ape->currentframe++;

    return 0;
}

static int ape_read_close(AVFormatContext * s)
{
    APEContext *ape = s->priv_data;

    av_freep(&ape->frames);
    av_freep(&ape->seektable);
    av_freep(&ape->bittable);
    return 0;
}

static int ape_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
{
    AVStream *st = s->streams[stream_index];
    APEContext *ape = s->priv_data;
    int index = av_index_search_timestamp(st, timestamp, flags);

    if (index < 0)
        return -1;

    if (avio_seek(s->pb, st->index_entries[index].pos, SEEK_SET) < 0)
        return -1;
    ape->currentframe = index;
    return 0;
}

AVInputFormat ff_ape_demuxer = {
    .name           = "ape",
    .long_name      = NULL_IF_CONFIG_SMALL("Monkey's Audio"),
    .priv_data_size = sizeof(APEContext),
    .read_probe     = ape_probe,
    .read_header    = ape_read_header,
    .read_packet    = ape_read_packet,
    .read_close     = ape_read_close,
    .read_seek      = ape_read_seek,
    .extensions     = "ape,apl,mac",
};