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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.
5 *
6 * This file is part of FFmpeg.
7 *
8 * FFmpeg is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
12 *
13 * FFmpeg is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
17 *
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 */
22
23#include <stdio.h>
24
25#include "libavutil/intreadwrite.h"
26#include "avformat.h"
27#include "internal.h"
28#include "apetag.h"
29
30/* The earliest and latest file formats supported by this library */
31#define APE_MIN_VERSION 3800
32#define APE_MAX_VERSION 3990
33
34#define MAC_FORMAT_FLAG_8_BIT 1 // is 8-bit [OBSOLETE]
35#define MAC_FORMAT_FLAG_CRC 2 // uses the new CRC32 error detection [OBSOLETE]
36#define MAC_FORMAT_FLAG_HAS_PEAK_LEVEL 4 // uint32 nPeakLevel after the header [OBSOLETE]
37#define MAC_FORMAT_FLAG_24_BIT 8 // is 24-bit [OBSOLETE]
38#define MAC_FORMAT_FLAG_HAS_SEEK_ELEMENTS 16 // has the number of seek elements after the peak level
39#define MAC_FORMAT_FLAG_CREATE_WAV_HEADER 32 // create the wave header on decompression (not stored)
40
41#define APE_EXTRADATA_SIZE 6
42
43typedef struct APEFrame {
44 int64_t pos;
45 int nblocks;
46 int size;
47 int skip;
48 int64_t pts;
49} APEFrame;
50
51typedef struct APEContext {
52 /* Derived fields */
53 uint32_t junklength;
54 uint32_t firstframe;
55 uint32_t totalsamples;
56 int currentframe;
57 APEFrame *frames;
58
59 /* Info from Descriptor Block */
60 int16_t fileversion;
61 int16_t padding1;
62 uint32_t descriptorlength;
63 uint32_t headerlength;
64 uint32_t seektablelength;
65 uint32_t wavheaderlength;
66 uint32_t audiodatalength;
67 uint32_t audiodatalength_high;
68 uint32_t wavtaillength;
69 uint8_t md5[16];
70
71 /* Info from Header Block */
72 uint16_t compressiontype;
73 uint16_t formatflags;
74 uint32_t blocksperframe;
75 uint32_t finalframeblocks;
76 uint32_t totalframes;
77 uint16_t bps;
78 uint16_t channels;
79 uint32_t samplerate;
80
81 /* Seektable */
82 uint32_t *seektable;
83 uint8_t *bittable;
84} APEContext;
85
86static int ape_probe(AVProbeData * p)
87{
88 int version = AV_RL16(p->buf+4);
89 if (AV_RL32(p->buf) != MKTAG('M', 'A', 'C', ' '))
90 return 0;
91
92 if (version < APE_MIN_VERSION || version > APE_MAX_VERSION)
93 return AVPROBE_SCORE_MAX/4;
94
95 return AVPROBE_SCORE_MAX;
96}
97
98static void ape_dumpinfo(AVFormatContext * s, APEContext * ape_ctx)
99{
100#ifdef DEBUG
101 int i;
102
103 av_log(s, AV_LOG_DEBUG, "Descriptor Block:\n\n");
104 av_log(s, AV_LOG_DEBUG, "fileversion = %"PRId16"\n", ape_ctx->fileversion);
105 av_log(s, AV_LOG_DEBUG, "descriptorlength = %"PRIu32"\n", ape_ctx->descriptorlength);
106 av_log(s, AV_LOG_DEBUG, "headerlength = %"PRIu32"\n", ape_ctx->headerlength);
107 av_log(s, AV_LOG_DEBUG, "seektablelength = %"PRIu32"\n", ape_ctx->seektablelength);
108 av_log(s, AV_LOG_DEBUG, "wavheaderlength = %"PRIu32"\n", ape_ctx->wavheaderlength);
109 av_log(s, AV_LOG_DEBUG, "audiodatalength = %"PRIu32"\n", ape_ctx->audiodatalength);
110 av_log(s, AV_LOG_DEBUG, "audiodatalength_high = %"PRIu32"\n", ape_ctx->audiodatalength_high);
111 av_log(s, AV_LOG_DEBUG, "wavtaillength = %"PRIu32"\n", ape_ctx->wavtaillength);
112 av_log(s, AV_LOG_DEBUG, "md5 = ");
113 for (i = 0; i < 16; i++)
114 av_log(s, AV_LOG_DEBUG, "%02x", ape_ctx->md5[i]);
115 av_log(s, AV_LOG_DEBUG, "\n");
116
117 av_log(s, AV_LOG_DEBUG, "\nHeader Block:\n\n");
118
119 av_log(s, AV_LOG_DEBUG, "compressiontype = %"PRIu16"\n", ape_ctx->compressiontype);
120 av_log(s, AV_LOG_DEBUG, "formatflags = %"PRIu16"\n", ape_ctx->formatflags);
121 av_log(s, AV_LOG_DEBUG, "blocksperframe = %"PRIu32"\n", ape_ctx->blocksperframe);
122 av_log(s, AV_LOG_DEBUG, "finalframeblocks = %"PRIu32"\n", ape_ctx->finalframeblocks);
123 av_log(s, AV_LOG_DEBUG, "totalframes = %"PRIu32"\n", ape_ctx->totalframes);
124 av_log(s, AV_LOG_DEBUG, "bps = %"PRIu16"\n", ape_ctx->bps);
125 av_log(s, AV_LOG_DEBUG, "channels = %"PRIu16"\n", ape_ctx->channels);
126 av_log(s, AV_LOG_DEBUG, "samplerate = %"PRIu32"\n", ape_ctx->samplerate);
127
128 av_log(s, AV_LOG_DEBUG, "\nSeektable\n\n");
129 if ((ape_ctx->seektablelength / sizeof(uint32_t)) != ape_ctx->totalframes) {
130 av_log(s, AV_LOG_DEBUG, "No seektable\n");
131 } else {
132 for (i = 0; i < ape_ctx->seektablelength / sizeof(uint32_t); i++) {
133 if (i < ape_ctx->totalframes - 1) {
134 av_log(s, AV_LOG_DEBUG, "%8d %"PRIu32" (%"PRIu32" bytes)",
135 i, ape_ctx->seektable[i],
136 ape_ctx->seektable[i + 1] - ape_ctx->seektable[i]);
137 if (ape_ctx->bittable)
138 av_log(s, AV_LOG_DEBUG, " + %2d bits\n",
139 ape_ctx->bittable[i]);
140 av_log(s, AV_LOG_DEBUG, "\n");
141 } else {
142 av_log(s, AV_LOG_DEBUG, "%8d %"PRIu32"\n", i, ape_ctx->seektable[i]);
143 }
144 }
145 }
146
147 av_log(s, AV_LOG_DEBUG, "\nFrames\n\n");
148 for (i = 0; i < ape_ctx->totalframes; i++)
149 av_log(s, AV_LOG_DEBUG, "%8d %8"PRId64" %8d (%d samples)\n", i,
150 ape_ctx->frames[i].pos, ape_ctx->frames[i].size,
151 ape_ctx->frames[i].nblocks);
152
153 av_log(s, AV_LOG_DEBUG, "\nCalculated information:\n\n");
154 av_log(s, AV_LOG_DEBUG, "junklength = %"PRIu32"\n", ape_ctx->junklength);
155 av_log(s, AV_LOG_DEBUG, "firstframe = %"PRIu32"\n", ape_ctx->firstframe);
156 av_log(s, AV_LOG_DEBUG, "totalsamples = %"PRIu32"\n", ape_ctx->totalsamples);
157#endif
158}
159
160static int ape_read_header(AVFormatContext * s)
161{
162 AVIOContext *pb = s->pb;
163 APEContext *ape = s->priv_data;
164 AVStream *st;
165 uint32_t tag;
166 int i;
167 int total_blocks, final_size = 0;
168 int64_t pts, file_size;
169
170 /* Skip any leading junk such as id3v2 tags */
171 ape->junklength = avio_tell(pb);
172
173 tag = avio_rl32(pb);
174 if (tag != MKTAG('M', 'A', 'C', ' '))
175 return AVERROR_INVALIDDATA;
176
177 ape->fileversion = avio_rl16(pb);
178
179 if (ape->fileversion < APE_MIN_VERSION || ape->fileversion > APE_MAX_VERSION) {
180 av_log(s, AV_LOG_ERROR, "Unsupported file version - %d.%02d\n",
181 ape->fileversion / 1000, (ape->fileversion % 1000) / 10);
182 return AVERROR_PATCHWELCOME;
183 }
184
185 if (ape->fileversion >= 3980) {
186 ape->padding1 = avio_rl16(pb);
187 ape->descriptorlength = avio_rl32(pb);
188 ape->headerlength = avio_rl32(pb);
189 ape->seektablelength = avio_rl32(pb);
190 ape->wavheaderlength = avio_rl32(pb);
191 ape->audiodatalength = avio_rl32(pb);
192 ape->audiodatalength_high = avio_rl32(pb);
193 ape->wavtaillength = avio_rl32(pb);
194 avio_read(pb, ape->md5, 16);
195
196 /* Skip any unknown bytes at the end of the descriptor.
197 This is for future compatibility */
198 if (ape->descriptorlength > 52)
199 avio_skip(pb, ape->descriptorlength - 52);
200
201 /* Read header data */
202 ape->compressiontype = avio_rl16(pb);
203 ape->formatflags = avio_rl16(pb);
204 ape->blocksperframe = avio_rl32(pb);
205 ape->finalframeblocks = avio_rl32(pb);
206 ape->totalframes = avio_rl32(pb);
207 ape->bps = avio_rl16(pb);
208 ape->channels = avio_rl16(pb);
209 ape->samplerate = avio_rl32(pb);
210 } else {
211 ape->descriptorlength = 0;
212 ape->headerlength = 32;
213
214 ape->compressiontype = avio_rl16(pb);
215 ape->formatflags = avio_rl16(pb);
216 ape->channels = avio_rl16(pb);
217 ape->samplerate = avio_rl32(pb);
218 ape->wavheaderlength = avio_rl32(pb);
219 ape->wavtaillength = avio_rl32(pb);
220 ape->totalframes = avio_rl32(pb);
221 ape->finalframeblocks = avio_rl32(pb);
222
223 if (ape->formatflags & MAC_FORMAT_FLAG_HAS_PEAK_LEVEL) {
224 avio_skip(pb, 4); /* Skip the peak level */
225 ape->headerlength += 4;
226 }
227
228 if (ape->formatflags & MAC_FORMAT_FLAG_HAS_SEEK_ELEMENTS) {
229 ape->seektablelength = avio_rl32(pb);
230 ape->headerlength += 4;
231 ape->seektablelength *= sizeof(int32_t);
232 } else
233 ape->seektablelength = ape->totalframes * sizeof(int32_t);
234
235 if (ape->formatflags & MAC_FORMAT_FLAG_8_BIT)
236 ape->bps = 8;
237 else if (ape->formatflags & MAC_FORMAT_FLAG_24_BIT)
238 ape->bps = 24;
239 else
240 ape->bps = 16;
241
242 if (ape->fileversion >= 3950)
243 ape->blocksperframe = 73728 * 4;
244 else if (ape->fileversion >= 3900 || (ape->fileversion >= 3800 && ape->compressiontype >= 4000))
245 ape->blocksperframe = 73728;
246 else
247 ape->blocksperframe = 9216;
248
249 /* Skip any stored wav header */
250 if (!(ape->formatflags & MAC_FORMAT_FLAG_CREATE_WAV_HEADER))
251 avio_skip(pb, ape->wavheaderlength);
252 }
253
254 if(!ape->totalframes){
255 av_log(s, AV_LOG_ERROR, "No frames in the file!\n");
256 return AVERROR(EINVAL);
257 }
258 if(ape->totalframes > UINT_MAX / sizeof(APEFrame)){
259 av_log(s, AV_LOG_ERROR, "Too many frames: %"PRIu32"\n",
260 ape->totalframes);
261 return AVERROR_INVALIDDATA;
262 }
263 if (ape->seektablelength / sizeof(*ape->seektable) < ape->totalframes) {
264 av_log(s, AV_LOG_ERROR,
265 "Number of seek entries is less than number of frames: %"SIZE_SPECIFIER" vs. %"PRIu32"\n",
266 ape->seektablelength / sizeof(*ape->seektable), ape->totalframes);
267 return AVERROR_INVALIDDATA;
268 }
269 ape->frames = av_malloc_array(ape->totalframes, sizeof(APEFrame));
270 if(!ape->frames)
271 return AVERROR(ENOMEM);
272 ape->firstframe = ape->junklength + ape->descriptorlength + ape->headerlength + ape->seektablelength + ape->wavheaderlength;
273 if (ape->fileversion < 3810)
274 ape->firstframe += ape->totalframes;
275 ape->currentframe = 0;
276
277
278 ape->totalsamples = ape->finalframeblocks;
279 if (ape->totalframes > 1)
280 ape->totalsamples += ape->blocksperframe * (ape->totalframes - 1);
281
282 if (ape->seektablelength > 0) {
283 ape->seektable = av_mallocz(ape->seektablelength);
284 if (!ape->seektable)
285 return AVERROR(ENOMEM);
286 for (i = 0; i < ape->seektablelength / sizeof(uint32_t) && !pb->eof_reached; i++)
287 ape->seektable[i] = avio_rl32(pb);
288 if (ape->fileversion < 3810) {
289 ape->bittable = av_mallocz(ape->totalframes);
290 if (!ape->bittable)
291 return AVERROR(ENOMEM);
292 for (i = 0; i < ape->totalframes && !pb->eof_reached; i++)
293 ape->bittable[i] = avio_r8(pb);
294 }
295 if (pb->eof_reached)
296 av_log(s, AV_LOG_WARNING, "File truncated\n");
297 }
298
299 ape->frames[0].pos = ape->firstframe;
300 ape->frames[0].nblocks = ape->blocksperframe;
301 ape->frames[0].skip = 0;
302 for (i = 1; i < ape->totalframes; i++) {
303 ape->frames[i].pos = ape->seektable[i] + ape->junklength;
304 ape->frames[i].nblocks = ape->blocksperframe;
305 ape->frames[i - 1].size = ape->frames[i].pos - ape->frames[i - 1].pos;
306 ape->frames[i].skip = (ape->frames[i].pos - ape->frames[0].pos) & 3;
307 }
308 ape->frames[ape->totalframes - 1].nblocks = ape->finalframeblocks;
309 /* calculate final packet size from total file size, if available */
310 file_size = avio_size(pb);
311 if (file_size > 0) {
312 final_size = file_size - ape->frames[ape->totalframes - 1].pos -
313 ape->wavtaillength;
314 final_size -= final_size & 3;
315 }
316 if (file_size <= 0 || final_size <= 0)
317 final_size = ape->finalframeblocks * 8;
318 ape->frames[ape->totalframes - 1].size = final_size;
319
320 for (i = 0; i < ape->totalframes; i++) {
321 if(ape->frames[i].skip){
322 ape->frames[i].pos -= ape->frames[i].skip;
323 ape->frames[i].size += ape->frames[i].skip;
324 }
325 ape->frames[i].size = (ape->frames[i].size + 3) & ~3;
326 }
327 if (ape->fileversion < 3810) {
328 for (i = 0; i < ape->totalframes; i++) {
329 if (i < ape->totalframes - 1 && ape->bittable[i + 1])
330 ape->frames[i].size += 4;
331 ape->frames[i].skip <<= 3;
332 ape->frames[i].skip += ape->bittable[i];
333 }
334 }
335
336 ape_dumpinfo(s, ape);
337
338 av_log(s, AV_LOG_VERBOSE, "Decoding file - v%d.%02d, compression level %"PRIu16"\n",
339 ape->fileversion / 1000, (ape->fileversion % 1000) / 10,
340 ape->compressiontype);
341
342 /* now we are ready: build format streams */
343 st = avformat_new_stream(s, NULL);
344 if (!st)
345 return AVERROR(ENOMEM);
346
347 total_blocks = (ape->totalframes == 0) ? 0 : ((ape->totalframes - 1) * ape->blocksperframe) + ape->finalframeblocks;
348
349 st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
350 st->codecpar->codec_id = AV_CODEC_ID_APE;
351 st->codecpar->codec_tag = MKTAG('A', 'P', 'E', ' ');
352 st->codecpar->channels = ape->channels;
353 st->codecpar->sample_rate = ape->samplerate;
354 st->codecpar->bits_per_coded_sample = ape->bps;
355
356 st->nb_frames = ape->totalframes;
357 st->start_time = 0;
358 st->duration = total_blocks;
359 avpriv_set_pts_info(st, 64, 1, ape->samplerate);
360
361 if (ff_alloc_extradata(st->codecpar, APE_EXTRADATA_SIZE))
362 return AVERROR(ENOMEM);
363 AV_WL16(st->codecpar->extradata + 0, ape->fileversion);
364 AV_WL16(st->codecpar->extradata + 2, ape->compressiontype);
365 AV_WL16(st->codecpar->extradata + 4, ape->formatflags);
366
367 pts = 0;
368 for (i = 0; i < ape->totalframes; i++) {
369 ape->frames[i].pts = pts;
370 av_add_index_entry(st, ape->frames[i].pos, ape->frames[i].pts, 0, 0, AVINDEX_KEYFRAME);
371 pts += ape->blocksperframe;
372 }
373
374 /* try to read APE tags */
375 if (pb->seekable & AVIO_SEEKABLE_NORMAL) {
376 ff_ape_parse_tag(s);
377 avio_seek(pb, 0, SEEK_SET);
378 }
379
380 return 0;
381}
382
383static int ape_read_packet(AVFormatContext * s, AVPacket * pkt)
384{
385 int ret;
386 int nblocks;
387 APEContext *ape = s->priv_data;
388 uint32_t extra_size = 8;
389
390 if (avio_feof(s->pb))
391 return AVERROR_EOF;
392 if (ape->currentframe >= ape->totalframes)
393 return AVERROR_EOF;
394
395 if (avio_seek(s->pb, ape->frames[ape->currentframe].pos, SEEK_SET) < 0)
396 return AVERROR(EIO);
397
398 /* Calculate how many blocks there are in this frame */
399 if (ape->currentframe == (ape->totalframes - 1))
400 nblocks = ape->finalframeblocks;
401 else
402 nblocks = ape->blocksperframe;
403
404 if (ape->frames[ape->currentframe].size <= 0 ||
405 ape->frames[ape->currentframe].size > INT_MAX - extra_size) {
406 av_log(s, AV_LOG_ERROR, "invalid packet size: %d\n",
407 ape->frames[ape->currentframe].size);
408 ape->currentframe++;
409 return AVERROR(EIO);
410 }
411
412 if (av_new_packet(pkt, ape->frames[ape->currentframe].size + extra_size) < 0)
413 return AVERROR(ENOMEM);
414
415 AV_WL32(pkt->data , nblocks);
416 AV_WL32(pkt->data + 4, ape->frames[ape->currentframe].skip);
417 ret = avio_read(s->pb, pkt->data + extra_size, ape->frames[ape->currentframe].size);
418 if (ret < 0) {
419 av_packet_unref(pkt);
420 return ret;
421 }
422
423 pkt->pts = ape->frames[ape->currentframe].pts;
424 pkt->stream_index = 0;
425
426 /* note: we need to modify the packet size here to handle the last
427 packet */
428 pkt->size = ret + extra_size;
429
430 ape->currentframe++;
431
432 return 0;
433}
434
435static int ape_read_close(AVFormatContext * s)
436{
437 APEContext *ape = s->priv_data;
438
439 av_freep(&ape->frames);
440 av_freep(&ape->seektable);
441 av_freep(&ape->bittable);
442 return 0;
443}
444
445static int ape_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
446{
447 AVStream *st = s->streams[stream_index];
448 APEContext *ape = s->priv_data;
449 int index = av_index_search_timestamp(st, timestamp, flags);
450
451 if (index < 0)
452 return -1;
453
454 if (avio_seek(s->pb, st->index_entries[index].pos, SEEK_SET) < 0)
455 return -1;
456 ape->currentframe = index;
457 return 0;
458}
459
460AVInputFormat ff_ape_demuxer = {
461 .name = "ape",
462 .long_name = NULL_IF_CONFIG_SMALL("Monkey's Audio"),
463 .priv_data_size = sizeof(APEContext),
464 .read_probe = ape_probe,
465 .read_header = ape_read_header,
466 .read_packet = ape_read_packet,
467 .read_close = ape_read_close,
468 .read_seek = ape_read_seek,
469 .extensions = "ape,apl,mac",
470};
471
generated by cgit at 2024-05-17 02:04:26 (GMT)