2 * Monkey's Audio APE demuxer
3 * Copyright (c) 2007 Benjamin Zores <ben@geexbox.org>
4 * based upon libdemac from Dave Chapman.
6 * This file is part of FFmpeg.
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.
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.
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
25 #include "libavutil/intreadwrite.h"
30 /* The earliest and latest file formats supported by this library */
31 #define APE_MIN_VERSION 3800
32 #define APE_MAX_VERSION 3990
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)
41 #define APE_EXTRADATA_SIZE 6
43 typedef struct APEFrame {
51 typedef struct APEContext {
55 uint32_t totalsamples;
59 /* Info from Descriptor Block */
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;
71 /* Info from Header Block */
72 uint16_t compressiontype;
74 uint32_t blocksperframe;
75 uint32_t finalframeblocks;
86 static int ape_probe(AVProbeData * p)
88 int version = AV_RL16(p->buf+4);
89 if (AV_RL32(p->buf) != MKTAG('M', 'A', 'C', ' '))
92 if (version < APE_MIN_VERSION || version > APE_MAX_VERSION)
93 return AVPROBE_SCORE_MAX/4;
95 return AVPROBE_SCORE_MAX;
98 static void ape_dumpinfo(AVFormatContext * s, APEContext * ape_ctx)
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");
117 av_log(s, AV_LOG_DEBUG, "\nHeader Block:\n\n");
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);
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");
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");
142 av_log(s, AV_LOG_DEBUG, "%8d %"PRIu32"\n", i, ape_ctx->seektable[i]);
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);
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);
160 static int ape_read_header(AVFormatContext * s)
162 AVIOContext *pb = s->pb;
163 APEContext *ape = s->priv_data;
167 int total_blocks, final_size = 0;
168 int64_t pts, file_size;
170 /* Skip any leading junk such as id3v2 tags */
171 ape->junklength = avio_tell(pb);
174 if (tag != MKTAG('M', 'A', 'C', ' '))
175 return AVERROR_INVALIDDATA;
177 ape->fileversion = avio_rl16(pb);
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;
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);
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);
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);
211 ape->descriptorlength = 0;
212 ape->headerlength = 32;
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);
223 if (ape->formatflags & MAC_FORMAT_FLAG_HAS_PEAK_LEVEL) {
224 avio_skip(pb, 4); /* Skip the peak level */
225 ape->headerlength += 4;
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);
233 ape->seektablelength = ape->totalframes * sizeof(int32_t);
235 if (ape->formatflags & MAC_FORMAT_FLAG_8_BIT)
237 else if (ape->formatflags & MAC_FORMAT_FLAG_24_BIT)
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;
247 ape->blocksperframe = 9216;
249 /* Skip any stored wav header */
250 if (!(ape->formatflags & MAC_FORMAT_FLAG_CREATE_WAV_HEADER))
251 avio_skip(pb, ape->wavheaderlength);
254 if(!ape->totalframes){
255 av_log(s, AV_LOG_ERROR, "No frames in the file!\n");
256 return AVERROR(EINVAL);
258 if(ape->totalframes > UINT_MAX / sizeof(APEFrame)){
259 av_log(s, AV_LOG_ERROR, "Too many frames: %"PRIu32"\n",
261 return AVERROR_INVALIDDATA;
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;
269 ape->frames = av_malloc_array(ape->totalframes, sizeof(APEFrame));
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;
278 ape->totalsamples = ape->finalframeblocks;
279 if (ape->totalframes > 1)
280 ape->totalsamples += ape->blocksperframe * (ape->totalframes - 1);
282 if (ape->seektablelength > 0) {
283 ape->seektable = av_mallocz(ape->seektablelength);
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);
291 return AVERROR(ENOMEM);
292 for (i = 0; i < ape->totalframes && !pb->eof_reached; i++)
293 ape->bittable[i] = avio_r8(pb);
296 av_log(s, AV_LOG_WARNING, "File truncated\n");
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;
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);
312 final_size = file_size - ape->frames[ape->totalframes - 1].pos -
314 final_size -= final_size & 3;
316 if (file_size <= 0 || final_size <= 0)
317 final_size = ape->finalframeblocks * 8;
318 ape->frames[ape->totalframes - 1].size = final_size;
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;
325 ape->frames[i].size = (ape->frames[i].size + 3) & ~3;
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];
336 ape_dumpinfo(s, ape);
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);
342 /* now we are ready: build format streams */
343 st = avformat_new_stream(s, NULL);
345 return AVERROR(ENOMEM);
347 total_blocks = (ape->totalframes == 0) ? 0 : ((ape->totalframes - 1) * ape->blocksperframe) + ape->finalframeblocks;
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;
356 st->nb_frames = ape->totalframes;
358 st->duration = total_blocks;
359 avpriv_set_pts_info(st, 64, 1, ape->samplerate);
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);
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;
374 /* try to read APE tags */
375 if (pb->seekable & AVIO_SEEKABLE_NORMAL) {
377 avio_seek(pb, 0, SEEK_SET);
383 static int ape_read_packet(AVFormatContext * s, AVPacket * pkt)
387 APEContext *ape = s->priv_data;
388 uint32_t extra_size = 8;
390 if (avio_feof(s->pb))
392 if (ape->currentframe >= ape->totalframes)
395 if (avio_seek(s->pb, ape->frames[ape->currentframe].pos, SEEK_SET) < 0)
398 /* Calculate how many blocks there are in this frame */
399 if (ape->currentframe == (ape->totalframes - 1))
400 nblocks = ape->finalframeblocks;
402 nblocks = ape->blocksperframe;
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);
412 if (av_new_packet(pkt, ape->frames[ape->currentframe].size + extra_size) < 0)
413 return AVERROR(ENOMEM);
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);
419 av_packet_unref(pkt);
423 pkt->pts = ape->frames[ape->currentframe].pts;
424 pkt->stream_index = 0;
426 /* note: we need to modify the packet size here to handle the last
428 pkt->size = ret + extra_size;
435 static int ape_read_close(AVFormatContext * s)
437 APEContext *ape = s->priv_data;
439 av_freep(&ape->frames);
440 av_freep(&ape->seektable);
441 av_freep(&ape->bittable);
445 static int ape_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
447 AVStream *st = s->streams[stream_index];
448 APEContext *ape = s->priv_data;
449 int index = av_index_search_timestamp(st, timestamp, flags);
454 if (avio_seek(s->pb, st->index_entries[index].pos, SEEK_SET) < 0)
456 ape->currentframe = index;
460 AVInputFormat ff_ape_demuxer = {
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",