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 3950
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 MAC_SUBFRAME_SIZE 4608
43 #define APE_EXTRADATA_SIZE 6
57 uint32_t totalsamples;
61 /* Info from Descriptor Block */
65 uint32_t descriptorlength;
66 uint32_t headerlength;
67 uint32_t seektablelength;
68 uint32_t wavheaderlength;
69 uint32_t audiodatalength;
70 uint32_t audiodatalength_high;
71 uint32_t wavtaillength;
74 /* Info from Header Block */
75 uint16_t compressiontype;
77 uint32_t blocksperframe;
78 uint32_t finalframeblocks;
88 static int ape_probe(AVProbeData * p)
90 if (p->buf[0] == 'M' && p->buf[1] == 'A' && p->buf[2] == 'C' && p->buf[3] == ' ')
91 return AVPROBE_SCORE_MAX;
96 static void ape_dumpinfo(AVFormatContext * s, APEContext * ape_ctx)
101 av_log(s, AV_LOG_DEBUG, "Descriptor Block:\n\n");
102 av_log(s, 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]);
103 av_log(s, AV_LOG_DEBUG, "fileversion = %"PRId16"\n", ape_ctx->fileversion);
104 av_log(s, AV_LOG_DEBUG, "descriptorlength = %"PRIu32"\n", ape_ctx->descriptorlength);
105 av_log(s, AV_LOG_DEBUG, "headerlength = %"PRIu32"\n", ape_ctx->headerlength);
106 av_log(s, AV_LOG_DEBUG, "seektablelength = %"PRIu32"\n", ape_ctx->seektablelength);
107 av_log(s, AV_LOG_DEBUG, "wavheaderlength = %"PRIu32"\n", ape_ctx->wavheaderlength);
108 av_log(s, AV_LOG_DEBUG, "audiodatalength = %"PRIu32"\n", ape_ctx->audiodatalength);
109 av_log(s, AV_LOG_DEBUG, "audiodatalength_high = %"PRIu32"\n", ape_ctx->audiodatalength_high);
110 av_log(s, AV_LOG_DEBUG, "wavtaillength = %"PRIu32"\n", ape_ctx->wavtaillength);
111 av_log(s, AV_LOG_DEBUG, "md5 = ");
112 for (i = 0; i < 16; i++)
113 av_log(s, AV_LOG_DEBUG, "%02x", ape_ctx->md5[i]);
114 av_log(s, AV_LOG_DEBUG, "\n");
116 av_log(s, AV_LOG_DEBUG, "\nHeader Block:\n\n");
118 av_log(s, AV_LOG_DEBUG, "compressiontype = %"PRIu16"\n", ape_ctx->compressiontype);
119 av_log(s, AV_LOG_DEBUG, "formatflags = %"PRIu16"\n", ape_ctx->formatflags);
120 av_log(s, AV_LOG_DEBUG, "blocksperframe = %"PRIu32"\n", ape_ctx->blocksperframe);
121 av_log(s, AV_LOG_DEBUG, "finalframeblocks = %"PRIu32"\n", ape_ctx->finalframeblocks);
122 av_log(s, AV_LOG_DEBUG, "totalframes = %"PRIu32"\n", ape_ctx->totalframes);
123 av_log(s, AV_LOG_DEBUG, "bps = %"PRIu16"\n", ape_ctx->bps);
124 av_log(s, AV_LOG_DEBUG, "channels = %"PRIu16"\n", ape_ctx->channels);
125 av_log(s, AV_LOG_DEBUG, "samplerate = %"PRIu32"\n", ape_ctx->samplerate);
127 av_log(s, AV_LOG_DEBUG, "\nSeektable\n\n");
128 if ((ape_ctx->seektablelength / sizeof(uint32_t)) != ape_ctx->totalframes) {
129 av_log(s, AV_LOG_DEBUG, "No seektable\n");
131 for (i = 0; i < ape_ctx->seektablelength / sizeof(uint32_t); i++) {
132 if (i < ape_ctx->totalframes - 1) {
133 av_log(s, AV_LOG_DEBUG, "%8d %"PRIu32" (%"PRIu32" bytes)\n",
134 i, ape_ctx->seektable[i],
135 ape_ctx->seektable[i + 1] - ape_ctx->seektable[i]);
137 av_log(s, AV_LOG_DEBUG, "%8d %"PRIu32"\n", i, ape_ctx->seektable[i]);
142 av_log(s, AV_LOG_DEBUG, "\nFrames\n\n");
143 for (i = 0; i < ape_ctx->totalframes; i++)
144 av_log(s, AV_LOG_DEBUG, "%8d %8"PRId64" %8d (%d samples)\n", i,
145 ape_ctx->frames[i].pos, ape_ctx->frames[i].size,
146 ape_ctx->frames[i].nblocks);
148 av_log(s, AV_LOG_DEBUG, "\nCalculated information:\n\n");
149 av_log(s, AV_LOG_DEBUG, "junklength = %"PRIu32"\n", ape_ctx->junklength);
150 av_log(s, AV_LOG_DEBUG, "firstframe = %"PRIu32"\n", ape_ctx->firstframe);
151 av_log(s, AV_LOG_DEBUG, "totalsamples = %"PRIu32"\n", ape_ctx->totalsamples);
155 static int ape_read_header(AVFormatContext * s)
157 AVIOContext *pb = s->pb;
158 APEContext *ape = s->priv_data;
162 int total_blocks, final_size = 0;
163 int64_t pts, file_size;
165 /* Skip any leading junk such as id3v2 tags */
166 ape->junklength = avio_tell(pb);
169 if (tag != MKTAG('M', 'A', 'C', ' '))
172 ape->fileversion = avio_rl16(pb);
174 if (ape->fileversion < APE_MIN_VERSION || ape->fileversion > APE_MAX_VERSION) {
175 av_log(s, AV_LOG_ERROR, "Unsupported file version - %d.%02d\n",
176 ape->fileversion / 1000, (ape->fileversion % 1000) / 10);
180 if (ape->fileversion >= 3980) {
181 ape->padding1 = avio_rl16(pb);
182 ape->descriptorlength = avio_rl32(pb);
183 ape->headerlength = avio_rl32(pb);
184 ape->seektablelength = avio_rl32(pb);
185 ape->wavheaderlength = avio_rl32(pb);
186 ape->audiodatalength = avio_rl32(pb);
187 ape->audiodatalength_high = avio_rl32(pb);
188 ape->wavtaillength = avio_rl32(pb);
189 avio_read(pb, ape->md5, 16);
191 /* Skip any unknown bytes at the end of the descriptor.
192 This is for future compatibility */
193 if (ape->descriptorlength > 52)
194 avio_skip(pb, ape->descriptorlength - 52);
196 /* Read header data */
197 ape->compressiontype = avio_rl16(pb);
198 ape->formatflags = avio_rl16(pb);
199 ape->blocksperframe = avio_rl32(pb);
200 ape->finalframeblocks = avio_rl32(pb);
201 ape->totalframes = avio_rl32(pb);
202 ape->bps = avio_rl16(pb);
203 ape->channels = avio_rl16(pb);
204 ape->samplerate = avio_rl32(pb);
206 ape->descriptorlength = 0;
207 ape->headerlength = 32;
209 ape->compressiontype = avio_rl16(pb);
210 ape->formatflags = avio_rl16(pb);
211 ape->channels = avio_rl16(pb);
212 ape->samplerate = avio_rl32(pb);
213 ape->wavheaderlength = avio_rl32(pb);
214 ape->wavtaillength = avio_rl32(pb);
215 ape->totalframes = avio_rl32(pb);
216 ape->finalframeblocks = avio_rl32(pb);
218 if (ape->formatflags & MAC_FORMAT_FLAG_HAS_PEAK_LEVEL) {
219 avio_skip(pb, 4); /* Skip the peak level */
220 ape->headerlength += 4;
223 if (ape->formatflags & MAC_FORMAT_FLAG_HAS_SEEK_ELEMENTS) {
224 ape->seektablelength = avio_rl32(pb);
225 ape->headerlength += 4;
226 ape->seektablelength *= sizeof(int32_t);
228 ape->seektablelength = ape->totalframes * sizeof(int32_t);
230 if (ape->formatflags & MAC_FORMAT_FLAG_8_BIT)
232 else if (ape->formatflags & MAC_FORMAT_FLAG_24_BIT)
237 if (ape->fileversion >= 3950)
238 ape->blocksperframe = 73728 * 4;
239 else if (ape->fileversion >= 3900 || (ape->fileversion >= 3800 && ape->compressiontype >= 4000))
240 ape->blocksperframe = 73728;
242 ape->blocksperframe = 9216;
244 /* Skip any stored wav header */
245 if (!(ape->formatflags & MAC_FORMAT_FLAG_CREATE_WAV_HEADER))
246 avio_skip(pb, ape->wavheaderlength);
249 if(!ape->totalframes){
250 av_log(s, AV_LOG_ERROR, "No frames in the file!\n");
251 return AVERROR(EINVAL);
253 if(ape->totalframes > UINT_MAX / sizeof(APEFrame)){
254 av_log(s, AV_LOG_ERROR, "Too many frames: %"PRIu32"\n",
258 if (ape->seektablelength && (ape->seektablelength / sizeof(*ape->seektable)) < ape->totalframes) {
259 av_log(s, AV_LOG_ERROR,
260 "Number of seek entries is less than number of frames: %zu vs. %"PRIu32"\n",
261 ape->seektablelength / sizeof(*ape->seektable), ape->totalframes);
262 return AVERROR_INVALIDDATA;
264 ape->frames = av_malloc(ape->totalframes * sizeof(APEFrame));
266 return AVERROR(ENOMEM);
267 ape->firstframe = ape->junklength + ape->descriptorlength + ape->headerlength + ape->seektablelength + ape->wavheaderlength;
268 ape->currentframe = 0;
271 ape->totalsamples = ape->finalframeblocks;
272 if (ape->totalframes > 1)
273 ape->totalsamples += ape->blocksperframe * (ape->totalframes - 1);
275 if (ape->seektablelength > 0) {
276 ape->seektable = av_malloc(ape->seektablelength);
278 return AVERROR(ENOMEM);
279 for (i = 0; i < ape->seektablelength / sizeof(uint32_t); i++)
280 ape->seektable[i] = avio_rl32(pb);
283 ape->frames[0].pos = ape->firstframe;
284 ape->frames[0].nblocks = ape->blocksperframe;
285 ape->frames[0].skip = 0;
286 for (i = 1; i < ape->totalframes; i++) {
287 ape->frames[i].pos = ape->seektable[i] + ape->junklength;
288 ape->frames[i].nblocks = ape->blocksperframe;
289 ape->frames[i - 1].size = ape->frames[i].pos - ape->frames[i - 1].pos;
290 ape->frames[i].skip = (ape->frames[i].pos - ape->frames[0].pos) & 3;
292 ape->frames[ape->totalframes - 1].nblocks = ape->finalframeblocks;
293 /* calculate final packet size from total file size, if available */
294 file_size = avio_size(pb);
296 final_size = file_size - ape->frames[ape->totalframes - 1].pos -
298 final_size -= final_size & 3;
300 if (file_size <= 0 || final_size <= 0)
301 final_size = ape->finalframeblocks * 8;
302 ape->frames[ape->totalframes - 1].size = final_size;
304 for (i = 0; i < ape->totalframes; i++) {
305 if(ape->frames[i].skip){
306 ape->frames[i].pos -= ape->frames[i].skip;
307 ape->frames[i].size += ape->frames[i].skip;
309 ape->frames[i].size = (ape->frames[i].size + 3) & ~3;
313 ape_dumpinfo(s, ape);
315 /* try to read APE tags */
318 avio_seek(pb, 0, SEEK_SET);
321 av_log(s, AV_LOG_DEBUG, "Decoding file - v%d.%02d, compression level %"PRIu16"\n",
322 ape->fileversion / 1000, (ape->fileversion % 1000) / 10,
323 ape->compressiontype);
325 /* now we are ready: build format streams */
326 st = avformat_new_stream(s, NULL);
330 total_blocks = (ape->totalframes == 0) ? 0 : ((ape->totalframes - 1) * ape->blocksperframe) + ape->finalframeblocks;
332 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
333 st->codec->codec_id = CODEC_ID_APE;
334 st->codec->codec_tag = MKTAG('A', 'P', 'E', ' ');
335 st->codec->channels = ape->channels;
336 st->codec->sample_rate = ape->samplerate;
337 st->codec->bits_per_coded_sample = ape->bps;
339 st->nb_frames = ape->totalframes;
341 st->duration = total_blocks / MAC_SUBFRAME_SIZE;
342 avpriv_set_pts_info(st, 64, MAC_SUBFRAME_SIZE, ape->samplerate);
344 st->codec->extradata = av_malloc(APE_EXTRADATA_SIZE);
345 st->codec->extradata_size = APE_EXTRADATA_SIZE;
346 AV_WL16(st->codec->extradata + 0, ape->fileversion);
347 AV_WL16(st->codec->extradata + 2, ape->compressiontype);
348 AV_WL16(st->codec->extradata + 4, ape->formatflags);
351 for (i = 0; i < ape->totalframes; i++) {
352 ape->frames[i].pts = pts;
353 av_add_index_entry(st, ape->frames[i].pos, ape->frames[i].pts, 0, 0, AVINDEX_KEYFRAME);
354 pts += ape->blocksperframe / MAC_SUBFRAME_SIZE;
360 static int ape_read_packet(AVFormatContext * s, AVPacket * pkt)
364 APEContext *ape = s->priv_data;
365 uint32_t extra_size = 8;
369 if (ape->currentframe >= ape->totalframes)
372 if (avio_seek(s->pb, ape->frames[ape->currentframe].pos, SEEK_SET) < 0)
375 /* Calculate how many blocks there are in this frame */
376 if (ape->currentframe == (ape->totalframes - 1))
377 nblocks = ape->finalframeblocks;
379 nblocks = ape->blocksperframe;
381 if (ape->frames[ape->currentframe].size <= 0 ||
382 ape->frames[ape->currentframe].size > INT_MAX - extra_size) {
383 av_log(s, AV_LOG_ERROR, "invalid packet size: %d\n",
384 ape->frames[ape->currentframe].size);
389 if (av_new_packet(pkt, ape->frames[ape->currentframe].size + extra_size) < 0)
390 return AVERROR(ENOMEM);
392 AV_WL32(pkt->data , nblocks);
393 AV_WL32(pkt->data + 4, ape->frames[ape->currentframe].skip);
394 ret = avio_read(s->pb, pkt->data + extra_size, ape->frames[ape->currentframe].size);
396 pkt->pts = ape->frames[ape->currentframe].pts;
397 pkt->stream_index = 0;
399 /* note: we need to modify the packet size here to handle the last
401 pkt->size = ret + extra_size;
408 static int ape_read_close(AVFormatContext * s)
410 APEContext *ape = s->priv_data;
412 av_freep(&ape->frames);
413 av_freep(&ape->seektable);
417 static int ape_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
419 AVStream *st = s->streams[stream_index];
420 APEContext *ape = s->priv_data;
421 int index = av_index_search_timestamp(st, timestamp, flags);
426 if (avio_seek(s->pb, st->index_entries[index].pos, SEEK_SET) < 0)
428 ape->currentframe = index;
432 AVInputFormat ff_ape_demuxer = {
434 .long_name = NULL_IF_CONFIG_SMALL("Monkey's Audio"),
435 .priv_data_size = sizeof(APEContext),
436 .read_probe = ape_probe,
437 .read_header = ape_read_header,
438 .read_packet = ape_read_packet,
439 .read_close = ape_read_close,
440 .read_seek = ape_read_seek,
441 .extensions = "ape,apl,mac",