PageRenderTime 65ms CodeModel.GetById 11ms app.highlight 47ms RepoModel.GetById 1ms app.codeStats 0ms

/libavformat/ape.c

http://github.com/FFmpeg/FFmpeg
C | 473 lines | 369 code | 67 blank | 37 comment | 71 complexity | f21a4043c9c1af7999fa469ebf9235c6 MD5 | raw file
  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(const 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, ret;
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 ((ret = ff_alloc_extradata(st->codecpar, APE_EXTRADATA_SIZE)) < 0)
362        return ret;
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    int64_t ret64;
390
391    if (avio_feof(s->pb))
392        return AVERROR_EOF;
393    if (ape->currentframe >= ape->totalframes)
394        return AVERROR_EOF;
395
396    ret64 = avio_seek(s->pb, ape->frames[ape->currentframe].pos, SEEK_SET);
397    if (ret64 < 0)
398        return ret64;
399
400    /* Calculate how many blocks there are in this frame */
401    if (ape->currentframe == (ape->totalframes - 1))
402        nblocks = ape->finalframeblocks;
403    else
404        nblocks = ape->blocksperframe;
405
406    if (ape->frames[ape->currentframe].size <= 0 ||
407        ape->frames[ape->currentframe].size > INT_MAX - extra_size) {
408        av_log(s, AV_LOG_ERROR, "invalid packet size: %d\n",
409               ape->frames[ape->currentframe].size);
410        ape->currentframe++;
411        return AVERROR(EIO);
412    }
413
414    ret = av_new_packet(pkt, ape->frames[ape->currentframe].size + extra_size);
415    if (ret < 0)
416        return ret;
417
418    AV_WL32(pkt->data    , nblocks);
419    AV_WL32(pkt->data + 4, ape->frames[ape->currentframe].skip);
420    ret = avio_read(s->pb, pkt->data + extra_size, ape->frames[ape->currentframe].size);
421    if (ret < 0) {
422        return ret;
423    }
424
425    pkt->pts = ape->frames[ape->currentframe].pts;
426    pkt->stream_index = 0;
427
428    /* note: we need to modify the packet size here to handle the last
429       packet */
430    pkt->size = ret + extra_size;
431
432    ape->currentframe++;
433
434    return 0;
435}
436
437static int ape_read_close(AVFormatContext * s)
438{
439    APEContext *ape = s->priv_data;
440
441    av_freep(&ape->frames);
442    av_freep(&ape->seektable);
443    av_freep(&ape->bittable);
444    return 0;
445}
446
447static int ape_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
448{
449    AVStream *st = s->streams[stream_index];
450    APEContext *ape = s->priv_data;
451    int index = av_index_search_timestamp(st, timestamp, flags);
452    int64_t ret;
453
454    if (index < 0)
455        return -1;
456
457    if ((ret = avio_seek(s->pb, st->index_entries[index].pos, SEEK_SET)) < 0)
458        return ret;
459    ape->currentframe = index;
460    return 0;
461}
462
463AVInputFormat ff_ape_demuxer = {
464    .name           = "ape",
465    .long_name      = NULL_IF_CONFIG_SMALL("Monkey's Audio"),
466    .priv_data_size = sizeof(APEContext),
467    .read_probe     = ape_probe,
468    .read_header    = ape_read_header,
469    .read_packet    = ape_read_packet,
470    .read_close     = ape_read_close,
471    .read_seek      = ape_read_seek,
472    .extensions     = "ape,apl,mac",
473};