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ffmpeg / libavformat / ape.c @ 470bce2b

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1
/*
2
 * Monkey's Audio APE demuxer
3
 * Copyright (c) 2007 Benjamin Zores <ben@geexbox.org>
4
 *  based upon libdemac from Dave Chapman.
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 *
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 * This file is part of FFmpeg.
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 *
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 * FFmpeg is free software; you can redistribute it and/or
9
 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * FFmpeg is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
22

    
23
#include <stdio.h>
24

    
25
#include "avformat.h"
26

    
27
#define ENABLE_DEBUG 0
28

    
29
/* The earliest and latest file formats supported by this library */
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#define APE_MIN_VERSION 3950
31
#define APE_MAX_VERSION 3990
32

    
33
#define MAC_FORMAT_FLAG_8_BIT                 1 // is 8-bit [OBSOLETE]
34
#define MAC_FORMAT_FLAG_CRC                   2 // uses the new CRC32 error detection [OBSOLETE]
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#define MAC_FORMAT_FLAG_HAS_PEAK_LEVEL        4 // uint32 nPeakLevel after the header [OBSOLETE]
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#define MAC_FORMAT_FLAG_24_BIT                8 // is 24-bit [OBSOLETE]
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#define MAC_FORMAT_FLAG_HAS_SEEK_ELEMENTS    16 // has the number of seek elements after the peak level
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#define MAC_FORMAT_FLAG_CREATE_WAV_HEADER    32 // create the wave header on decompression (not stored)
39

    
40
#define MAC_SUBFRAME_SIZE 4608
41

    
42
#define APE_EXTRADATA_SIZE 6
43

    
44
/* APE tags */
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#define APE_TAG_VERSION               2000
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#define APE_TAG_FOOTER_BYTES          32
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#define APE_TAG_FLAG_CONTAINS_HEADER  (1 << 31)
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#define APE_TAG_FLAG_IS_HEADER        (1 << 29)
49

    
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#define TAG(name, field)  {name, offsetof(AVFormatContext, field), sizeof(((AVFormatContext *)0)->field)}
51

    
52
static const struct {
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    const char *name;
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    int offset;
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    int size;
56
} tags[] = {
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    TAG("Title"    , title    ),
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    TAG("Artist"   , author   ),
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    TAG("Copyright", copyright),
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    TAG("Comment"  , comment  ),
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    TAG("Album"    , album    ),
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    TAG("Year"     , year     ),
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    TAG("Track"    , track    ),
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    TAG("Genre"    , genre    ),
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    { NULL }
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};
67

    
68
typedef struct {
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    int64_t pos;
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    int nblocks;
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    int size;
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    int skip;
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    int64_t pts;
74
} APEFrame;
75

    
76
typedef struct {
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    /* Derived fields */
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    uint32_t junklength;
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    uint32_t firstframe;
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    uint32_t totalsamples;
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    int currentframe;
82
    APEFrame *frames;
83

    
84
    /* Info from Descriptor Block */
85
    char magic[4];
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    int16_t fileversion;
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    int16_t padding1;
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    uint32_t descriptorlength;
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    uint32_t headerlength;
90
    uint32_t seektablelength;
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    uint32_t wavheaderlength;
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    uint32_t audiodatalength;
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    uint32_t audiodatalength_high;
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    uint32_t wavtaillength;
95
    uint8_t md5[16];
96

    
97
    /* Info from Header Block */
98
    uint16_t compressiontype;
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    uint16_t formatflags;
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    uint32_t blocksperframe;
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    uint32_t finalframeblocks;
102
    uint32_t totalframes;
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    uint16_t bps;
104
    uint16_t channels;
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    uint32_t samplerate;
106

    
107
    /* Seektable */
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    uint32_t *seektable;
109
} APEContext;
110

    
111
static void ape_tag_read_field(AVFormatContext *s)
112
{
113
    ByteIOContext *pb = s->pb;
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    uint8_t buf[1024];
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    uint32_t size;
116
    int i;
117

    
118
    memset(buf, 0, 1024);
119
    size = get_le32(pb);  /* field size */
120
    url_fskip(pb, 4);     /* skip field flags */
121

    
122
    for (i=0; pb->buf_ptr[i]!='0' && pb->buf_ptr[i]>=0x20 && pb->buf_ptr[i]<=0x7E; i++);
123

    
124
    get_buffer(pb, buf, FFMIN(i, 1024));
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    url_fskip(pb, 1);
126

    
127
    for (i=0; tags[i].name; i++)
128
        if (!strcmp (buf, tags[i].name)) {
129
            if (tags[i].size == sizeof(int)) {
130
                char tmp[16];
131
                get_buffer(pb, tmp, FFMIN(sizeof(tmp), size));
132
                *(int *)(((char *)s)+tags[i].offset) = atoi(tmp);
133
            } else {
134
                get_buffer(pb, ((char *)s) + tags[i].offset,
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                           FFMIN(tags[i].size, size));
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            }
137
            break;
138
        }
139

    
140
    if (!tags[i].name)
141
        url_fskip(pb, size);
142
}
143

    
144
static void ape_parse_tag(AVFormatContext *s)
145
{
146
    ByteIOContext *pb = s->pb;
147
    int file_size = url_fsize(pb);
148
    uint32_t val, fields, tag_bytes;
149
    uint8_t buf[8];
150
    int i;
151

    
152
    if (file_size < APE_TAG_FOOTER_BYTES)
153
        return;
154

    
155
    url_fseek(pb, file_size - APE_TAG_FOOTER_BYTES, SEEK_SET);
156

    
157
    get_buffer(pb, buf, 8);    /* APETAGEX */
158
    if (strncmp(buf, "APETAGEX", 8)) {
159
        return;
160
    }
161

    
162
    val = get_le32(pb);        /* APE tag version */
163
    if (val > APE_TAG_VERSION) {
164
        av_log(NULL, AV_LOG_ERROR, "Unsupported tag version. (>=%d)\n", APE_TAG_VERSION);
165
        return;
166
    }
167

    
168
    tag_bytes = get_le32(pb);  /* tag size */
169
    if (tag_bytes - APE_TAG_FOOTER_BYTES > (1024 * 1024 * 16)) {
170
        av_log(NULL, AV_LOG_ERROR, "Tag size is way too big\n");
171
        return;
172
    }
173

    
174
    fields = get_le32(pb);     /* number of fields */
175
    if (fields > 65536) {
176
        av_log(NULL, AV_LOG_ERROR, "Too many tag fields (%d)\n", fields);
177
        return;
178
    }
179

    
180
    val = get_le32(pb);        /* flags */
181
    if (val & APE_TAG_FLAG_IS_HEADER) {
182
        av_log(NULL, AV_LOG_ERROR, "APE Tag is a header\n");
183
        return;
184
    }
185

    
186
    if (val & APE_TAG_FLAG_CONTAINS_HEADER)
187
        tag_bytes += 2*APE_TAG_FOOTER_BYTES;
188

    
189
    url_fseek(pb, file_size - tag_bytes, SEEK_SET);
190

    
191
    for (i=0; i<fields; i++)
192
        ape_tag_read_field(s);
193

    
194
#if ENABLE_DEBUG
195
    av_log(NULL, AV_LOG_DEBUG, "\nAPE Tags:\n\n");
196
    av_log(NULL, AV_LOG_DEBUG, "title     = %s\n", s->title);
197
    av_log(NULL, AV_LOG_DEBUG, "author    = %s\n", s->author);
198
    av_log(NULL, AV_LOG_DEBUG, "copyright = %s\n", s->copyright);
199
    av_log(NULL, AV_LOG_DEBUG, "comment   = %s\n", s->comment);
200
    av_log(NULL, AV_LOG_DEBUG, "album     = %s\n", s->album);
201
    av_log(NULL, AV_LOG_DEBUG, "year      = %d\n", s->year);
202
    av_log(NULL, AV_LOG_DEBUG, "track     = %d\n", s->track);
203
    av_log(NULL, AV_LOG_DEBUG, "genre     = %s\n", s->genre);
204
#endif
205
}
206

    
207
static int ape_probe(AVProbeData * p)
208
{
209
    if (p->buf[0] == 'M' && p->buf[1] == 'A' && p->buf[2] == 'C' && p->buf[3] == ' ')
210
        return AVPROBE_SCORE_MAX;
211

    
212
    return 0;
213
}
214

    
215
static void ape_dumpinfo(APEContext * ape_ctx)
216
{
217
#if ENABLE_DEBUG
218
    int i;
219

    
220
    av_log(NULL, AV_LOG_DEBUG, "Descriptor Block:\n\n");
221
    av_log(NULL, AV_LOG_DEBUG, "magic                = \"%c%c%c%c\"\n", ape_ctx->magic[0], ape_ctx->magic[1], ape_ctx->magic[2], ape_ctx->magic[3]);
222
    av_log(NULL, AV_LOG_DEBUG, "fileversion          = %d\n", ape_ctx->fileversion);
223
    av_log(NULL, AV_LOG_DEBUG, "descriptorlength     = %d\n", ape_ctx->descriptorlength);
224
    av_log(NULL, AV_LOG_DEBUG, "headerlength         = %d\n", ape_ctx->headerlength);
225
    av_log(NULL, AV_LOG_DEBUG, "seektablelength      = %d\n", ape_ctx->seektablelength);
226
    av_log(NULL, AV_LOG_DEBUG, "wavheaderlength      = %d\n", ape_ctx->wavheaderlength);
227
    av_log(NULL, AV_LOG_DEBUG, "audiodatalength      = %d\n", ape_ctx->audiodatalength);
228
    av_log(NULL, AV_LOG_DEBUG, "audiodatalength_high = %d\n", ape_ctx->audiodatalength_high);
229
    av_log(NULL, AV_LOG_DEBUG, "wavtaillength        = %d\n", ape_ctx->wavtaillength);
230
    av_log(NULL, AV_LOG_DEBUG, "md5                  = ");
231
    for (i = 0; i < 16; i++)
232
         av_log(NULL, AV_LOG_DEBUG, "%02x", ape_ctx->md5[i]);
233
    av_log(NULL, AV_LOG_DEBUG, "\n");
234

    
235
    av_log(NULL, AV_LOG_DEBUG, "\nHeader Block:\n\n");
236

    
237
    av_log(NULL, AV_LOG_DEBUG, "compressiontype      = %d\n", ape_ctx->compressiontype);
238
    av_log(NULL, AV_LOG_DEBUG, "formatflags          = %d\n", ape_ctx->formatflags);
239
    av_log(NULL, AV_LOG_DEBUG, "blocksperframe       = %d\n", ape_ctx->blocksperframe);
240
    av_log(NULL, AV_LOG_DEBUG, "finalframeblocks     = %d\n", ape_ctx->finalframeblocks);
241
    av_log(NULL, AV_LOG_DEBUG, "totalframes          = %d\n", ape_ctx->totalframes);
242
    av_log(NULL, AV_LOG_DEBUG, "bps                  = %d\n", ape_ctx->bps);
243
    av_log(NULL, AV_LOG_DEBUG, "channels             = %d\n", ape_ctx->channels);
244
    av_log(NULL, AV_LOG_DEBUG, "samplerate           = %d\n", ape_ctx->samplerate);
245

    
246
    av_log(NULL, AV_LOG_DEBUG, "\nSeektable\n\n");
247
    if ((ape_ctx->seektablelength / sizeof(uint32_t)) != ape_ctx->totalframes) {
248
        av_log(NULL, AV_LOG_DEBUG, "No seektable\n");
249
    } else {
250
        for (i = 0; i < ape_ctx->seektablelength / sizeof(uint32_t); i++) {
251
            if (i < ape_ctx->totalframes - 1) {
252
                av_log(NULL, AV_LOG_DEBUG, "%8d   %d (%d bytes)\n", i, ape_ctx->seektable[i], ape_ctx->seektable[i + 1] - ape_ctx->seektable[i]);
253
            } else {
254
                av_log(NULL, AV_LOG_DEBUG, "%8d   %d\n", i, ape_ctx->seektable[i]);
255
            }
256
        }
257
    }
258

    
259
    av_log(NULL, AV_LOG_DEBUG, "\nFrames\n\n");
260
    for (i = 0; i < ape_ctx->totalframes; i++)
261
        av_log(NULL, AV_LOG_DEBUG, "%8d   %8lld %8d (%d samples)\n", i, ape_ctx->frames[i].pos, ape_ctx->frames[i].size, ape_ctx->frames[i].nblocks);
262

    
263
    av_log(NULL, AV_LOG_DEBUG, "\nCalculated information:\n\n");
264
    av_log(NULL, AV_LOG_DEBUG, "junklength           = %d\n", ape_ctx->junklength);
265
    av_log(NULL, AV_LOG_DEBUG, "firstframe           = %d\n", ape_ctx->firstframe);
266
    av_log(NULL, AV_LOG_DEBUG, "totalsamples         = %d\n", ape_ctx->totalsamples);
267
#endif
268
}
269

    
270
static int ape_read_header(AVFormatContext * s, AVFormatParameters * ap)
271
{
272
    ByteIOContext *pb = s->pb;
273
    APEContext *ape = s->priv_data;
274
    AVStream *st;
275
    uint32_t tag;
276
    int i;
277
    int total_blocks;
278
    int64_t pts;
279

    
280
    /* TODO: Skip any leading junk such as id3v2 tags */
281
    ape->junklength = 0;
282

    
283
    tag = get_le32(pb);
284
    if (tag != MKTAG('M', 'A', 'C', ' '))
285
        return -1;
286

    
287
    ape->fileversion = get_le16(pb);
288

    
289
    if (ape->fileversion < APE_MIN_VERSION || ape->fileversion > APE_MAX_VERSION) {
290
        av_log(s, AV_LOG_ERROR, "Unsupported file version - %d.%02d\n", ape->fileversion / 1000, (ape->fileversion % 1000) / 10);
291
        return -1;
292
    }
293

    
294
    if (ape->fileversion >= 3980) {
295
        ape->padding1             = get_le16(pb);
296
        ape->descriptorlength     = get_le32(pb);
297
        ape->headerlength         = get_le32(pb);
298
        ape->seektablelength      = get_le32(pb);
299
        ape->wavheaderlength      = get_le32(pb);
300
        ape->audiodatalength      = get_le32(pb);
301
        ape->audiodatalength_high = get_le32(pb);
302
        ape->wavtaillength        = get_le32(pb);
303
        get_buffer(pb, ape->md5, 16);
304

    
305
        /* Skip any unknown bytes at the end of the descriptor.
306
           This is for future compatibility */
307
        if (ape->descriptorlength > 52)
308
            url_fseek(pb, ape->descriptorlength - 52, SEEK_CUR);
309

    
310
        /* Read header data */
311
        ape->compressiontype      = get_le16(pb);
312
        ape->formatflags          = get_le16(pb);
313
        ape->blocksperframe       = get_le32(pb);
314
        ape->finalframeblocks     = get_le32(pb);
315
        ape->totalframes          = get_le32(pb);
316
        ape->bps                  = get_le16(pb);
317
        ape->channels             = get_le16(pb);
318
        ape->samplerate           = get_le32(pb);
319
    } else {
320
        ape->descriptorlength = 0;
321
        ape->headerlength = 32;
322

    
323
        ape->compressiontype      = get_le16(pb);
324
        ape->formatflags          = get_le16(pb);
325
        ape->channels             = get_le16(pb);
326
        ape->samplerate           = get_le32(pb);
327
        ape->wavheaderlength      = get_le32(pb);
328
        ape->wavtaillength        = get_le32(pb);
329
        ape->totalframes          = get_le32(pb);
330
        ape->finalframeblocks     = get_le32(pb);
331

    
332
        if (ape->formatflags & MAC_FORMAT_FLAG_HAS_PEAK_LEVEL) {
333
            url_fseek(pb, 4, SEEK_CUR); /* Skip the peak level */
334
            ape->headerlength += 4;
335
        }
336

    
337
        if (ape->formatflags & MAC_FORMAT_FLAG_HAS_SEEK_ELEMENTS) {
338
            ape->seektablelength = get_le32(pb);
339
            ape->headerlength += 4;
340
            ape->seektablelength *= sizeof(int32_t);
341
        } else
342
            ape->seektablelength = ape->totalframes * sizeof(int32_t);
343

    
344
        if (ape->formatflags & MAC_FORMAT_FLAG_8_BIT)
345
            ape->bps = 8;
346
        else if (ape->formatflags & MAC_FORMAT_FLAG_24_BIT)
347
            ape->bps = 24;
348
        else
349
            ape->bps = 16;
350

    
351
        if (ape->fileversion >= 3950)
352
            ape->blocksperframe = 73728 * 4;
353
        else if (ape->fileversion >= 3900 || (ape->fileversion >= 3800  && ape->compressiontype >= 4000))
354
            ape->blocksperframe = 73728;
355
        else
356
            ape->blocksperframe = 9216;
357

    
358
        /* Skip any stored wav header */
359
        if (!(ape->formatflags & MAC_FORMAT_FLAG_CREATE_WAV_HEADER))
360
            url_fskip(pb, ape->wavheaderlength);
361
    }
362

    
363
    if(ape->totalframes > UINT_MAX / sizeof(APEFrame)){
364
        av_log(s, AV_LOG_ERROR, "Too many frames: %d\n", ape->totalframes);
365
        return -1;
366
    }
367
    ape->frames       = av_malloc(ape->totalframes * sizeof(APEFrame));
368
    if(!ape->frames)
369
        return AVERROR_NOMEM;
370
    ape->firstframe   = ape->junklength + ape->descriptorlength + ape->headerlength + ape->seektablelength + ape->wavheaderlength;
371
    ape->currentframe = 0;
372

    
373

    
374
    ape->totalsamples = ape->finalframeblocks;
375
    if (ape->totalframes > 1)
376
        ape->totalsamples += ape->blocksperframe * (ape->totalframes - 1);
377

    
378
    if (ape->seektablelength > 0) {
379
        ape->seektable = av_malloc(ape->seektablelength);
380
        for (i = 0; i < ape->seektablelength / sizeof(uint32_t); i++)
381
            ape->seektable[i] = get_le32(pb);
382
    }
383

    
384
    ape->frames[0].pos     = ape->firstframe;
385
    ape->frames[0].nblocks = ape->blocksperframe;
386
    ape->frames[0].skip    = 0;
387
    for (i = 1; i < ape->totalframes; i++) {
388
        ape->frames[i].pos      = ape->seektable[i]; //ape->frames[i-1].pos + ape->blocksperframe;
389
        ape->frames[i].nblocks  = ape->blocksperframe;
390
        ape->frames[i - 1].size = ape->frames[i].pos - ape->frames[i - 1].pos;
391
        ape->frames[i].skip     = (ape->frames[i].pos - ape->frames[0].pos) & 3;
392
    }
393
    ape->frames[ape->totalframes - 1].size    = ape->finalframeblocks * 4;
394
    ape->frames[ape->totalframes - 1].nblocks = ape->finalframeblocks;
395

    
396
    for (i = 0; i < ape->totalframes; i++) {
397
        if(ape->frames[i].skip){
398
            ape->frames[i].pos  -= ape->frames[i].skip;
399
            ape->frames[i].size += ape->frames[i].skip;
400
        }
401
        ape->frames[i].size = (ape->frames[i].size + 3) & ~3;
402
    }
403

    
404

    
405
    ape_dumpinfo(ape);
406

    
407
    /* try to read APE tags */
408
    if (!url_is_streamed(pb)) {
409
        ape_parse_tag(s);
410
        url_fseek(pb, 0, SEEK_SET);
411
    }
412

    
413
    av_log(s, AV_LOG_DEBUG, "Decoding file - v%d.%02d, compression level %d\n", ape->fileversion / 1000, (ape->fileversion % 1000) / 10, ape->compressiontype);
414

    
415
    /* now we are ready: build format streams */
416
    st = av_new_stream(s, 0);
417
    if (!st)
418
        return -1;
419

    
420
    total_blocks = (ape->totalframes == 0) ? 0 : ((ape->totalframes - 1) * ape->blocksperframe) + ape->finalframeblocks;
421

    
422
    st->codec->codec_type      = CODEC_TYPE_AUDIO;
423
    st->codec->codec_id        = CODEC_ID_APE;
424
    st->codec->codec_tag       = MKTAG('A', 'P', 'E', ' ');
425
    st->codec->channels        = ape->channels;
426
    st->codec->sample_rate     = ape->samplerate;
427
    st->codec->bits_per_coded_sample = ape->bps;
428
    st->codec->frame_size      = MAC_SUBFRAME_SIZE;
429

    
430
    st->nb_frames = ape->totalframes;
431
    s->start_time = 0;
432
    s->duration   = (int64_t) total_blocks * AV_TIME_BASE / ape->samplerate;
433
    av_set_pts_info(st, 64, MAC_SUBFRAME_SIZE, ape->samplerate);
434

    
435
    st->codec->extradata = av_malloc(APE_EXTRADATA_SIZE);
436
    st->codec->extradata_size = APE_EXTRADATA_SIZE;
437
    AV_WL16(st->codec->extradata + 0, ape->fileversion);
438
    AV_WL16(st->codec->extradata + 2, ape->compressiontype);
439
    AV_WL16(st->codec->extradata + 4, ape->formatflags);
440

    
441
    pts = 0;
442
    for (i = 0; i < ape->totalframes; i++) {
443
        ape->frames[i].pts = pts;
444
        av_add_index_entry(st, ape->frames[i].pos, ape->frames[i].pts, 0, 0, AVINDEX_KEYFRAME);
445
        pts += ape->blocksperframe / MAC_SUBFRAME_SIZE;
446
    }
447

    
448
    return 0;
449
}
450

    
451
static int ape_read_packet(AVFormatContext * s, AVPacket * pkt)
452
{
453
    int ret;
454
    int nblocks;
455
    APEContext *ape = s->priv_data;
456
    uint32_t extra_size = 8;
457

    
458
    if (url_feof(s->pb))
459
        return AVERROR_IO;
460
    if (ape->currentframe > ape->totalframes)
461
        return AVERROR_IO;
462

    
463
    url_fseek (s->pb, ape->frames[ape->currentframe].pos, SEEK_SET);
464

    
465
    /* Calculate how many blocks there are in this frame */
466
    if (ape->currentframe == (ape->totalframes - 1))
467
        nblocks = ape->finalframeblocks;
468
    else
469
        nblocks = ape->blocksperframe;
470

    
471
    if (av_new_packet(pkt,  ape->frames[ape->currentframe].size + extra_size) < 0)
472
        return AVERROR_NOMEM;
473

    
474
    AV_WL32(pkt->data    , nblocks);
475
    AV_WL32(pkt->data + 4, ape->frames[ape->currentframe].skip);
476
    ret = get_buffer(s->pb, pkt->data + extra_size, ape->frames[ape->currentframe].size);
477

    
478
    pkt->pts = ape->frames[ape->currentframe].pts;
479
    pkt->stream_index = 0;
480

    
481
    /* note: we need to modify the packet size here to handle the last
482
       packet */
483
    pkt->size = ret + extra_size;
484

    
485
    ape->currentframe++;
486

    
487
    return 0;
488
}
489

    
490
static int ape_read_close(AVFormatContext * s)
491
{
492
    APEContext *ape = s->priv_data;
493

    
494
    av_freep(&ape->frames);
495
    av_freep(&ape->seektable);
496
    return 0;
497
}
498

    
499
static int ape_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
500
{
501
    AVStream *st = s->streams[stream_index];
502
    APEContext *ape = s->priv_data;
503
    int index = av_index_search_timestamp(st, timestamp, flags);
504

    
505
    if (index < 0)
506
        return -1;
507

    
508
    ape->currentframe = index;
509
    return 0;
510
}
511

    
512
AVInputFormat ape_demuxer = {
513
    "ape",
514
    NULL_IF_CONFIG_SMALL("Monkey's Audio"),
515
    sizeof(APEContext),
516
    ape_probe,
517
    ape_read_header,
518
    ape_read_packet,
519
    ape_read_close,
520
    ape_read_seek,
521
    .extensions = "ape,apl,mac"
522
};