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00023 #include <stdio.h>
00024
00025 #include "libavutil/intreadwrite.h"
00026 #include "avformat.h"
00027 #include "apetag.h"
00028
00029
00030 #define APE_MIN_VERSION 3950
00031 #define APE_MAX_VERSION 3990
00032
00033 #define MAC_FORMAT_FLAG_8_BIT 1 // is 8-bit [OBSOLETE]
00034 #define MAC_FORMAT_FLAG_CRC 2 // uses the new CRC32 error detection [OBSOLETE]
00035 #define MAC_FORMAT_FLAG_HAS_PEAK_LEVEL 4 // uint32 nPeakLevel after the header [OBSOLETE]
00036 #define MAC_FORMAT_FLAG_24_BIT 8 // is 24-bit [OBSOLETE]
00037 #define MAC_FORMAT_FLAG_HAS_SEEK_ELEMENTS 16 // has the number of seek elements after the peak level
00038 #define MAC_FORMAT_FLAG_CREATE_WAV_HEADER 32 // create the wave header on decompression (not stored)
00039
00040 #define MAC_SUBFRAME_SIZE 4608
00041
00042 #define APE_EXTRADATA_SIZE 6
00043
00044 typedef struct {
00045 int64_t pos;
00046 int nblocks;
00047 int size;
00048 int skip;
00049 int64_t pts;
00050 } APEFrame;
00051
00052 typedef struct {
00053
00054 uint32_t junklength;
00055 uint32_t firstframe;
00056 uint32_t totalsamples;
00057 int currentframe;
00058 APEFrame *frames;
00059
00060
00061 char magic[4];
00062 int16_t fileversion;
00063 int16_t padding1;
00064 uint32_t descriptorlength;
00065 uint32_t headerlength;
00066 uint32_t seektablelength;
00067 uint32_t wavheaderlength;
00068 uint32_t audiodatalength;
00069 uint32_t audiodatalength_high;
00070 uint32_t wavtaillength;
00071 uint8_t md5[16];
00072
00073
00074 uint16_t compressiontype;
00075 uint16_t formatflags;
00076 uint32_t blocksperframe;
00077 uint32_t finalframeblocks;
00078 uint32_t totalframes;
00079 uint16_t bps;
00080 uint16_t channels;
00081 uint32_t samplerate;
00082
00083
00084 uint32_t *seektable;
00085 } APEContext;
00086
00087 static int ape_probe(AVProbeData * p)
00088 {
00089 if (p->buf[0] == 'M' && p->buf[1] == 'A' && p->buf[2] == 'C' && p->buf[3] == ' ')
00090 return AVPROBE_SCORE_MAX;
00091
00092 return 0;
00093 }
00094
00095 static void ape_dumpinfo(AVFormatContext * s, APEContext * ape_ctx)
00096 {
00097 #ifdef DEBUG
00098 int i;
00099
00100 av_log(s, AV_LOG_DEBUG, "Descriptor Block:\n\n");
00101 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]);
00102 av_log(s, AV_LOG_DEBUG, "fileversion = %"PRId16"\n", ape_ctx->fileversion);
00103 av_log(s, AV_LOG_DEBUG, "descriptorlength = %"PRIu32"\n", ape_ctx->descriptorlength);
00104 av_log(s, AV_LOG_DEBUG, "headerlength = %"PRIu32"\n", ape_ctx->headerlength);
00105 av_log(s, AV_LOG_DEBUG, "seektablelength = %"PRIu32"\n", ape_ctx->seektablelength);
00106 av_log(s, AV_LOG_DEBUG, "wavheaderlength = %"PRIu32"\n", ape_ctx->wavheaderlength);
00107 av_log(s, AV_LOG_DEBUG, "audiodatalength = %"PRIu32"\n", ape_ctx->audiodatalength);
00108 av_log(s, AV_LOG_DEBUG, "audiodatalength_high = %"PRIu32"\n", ape_ctx->audiodatalength_high);
00109 av_log(s, AV_LOG_DEBUG, "wavtaillength = %"PRIu32"\n", ape_ctx->wavtaillength);
00110 av_log(s, AV_LOG_DEBUG, "md5 = ");
00111 for (i = 0; i < 16; i++)
00112 av_log(s, AV_LOG_DEBUG, "%02x", ape_ctx->md5[i]);
00113 av_log(s, AV_LOG_DEBUG, "\n");
00114
00115 av_log(s, AV_LOG_DEBUG, "\nHeader Block:\n\n");
00116
00117 av_log(s, AV_LOG_DEBUG, "compressiontype = %"PRIu16"\n", ape_ctx->compressiontype);
00118 av_log(s, AV_LOG_DEBUG, "formatflags = %"PRIu16"\n", ape_ctx->formatflags);
00119 av_log(s, AV_LOG_DEBUG, "blocksperframe = %"PRIu32"\n", ape_ctx->blocksperframe);
00120 av_log(s, AV_LOG_DEBUG, "finalframeblocks = %"PRIu32"\n", ape_ctx->finalframeblocks);
00121 av_log(s, AV_LOG_DEBUG, "totalframes = %"PRIu32"\n", ape_ctx->totalframes);
00122 av_log(s, AV_LOG_DEBUG, "bps = %"PRIu16"\n", ape_ctx->bps);
00123 av_log(s, AV_LOG_DEBUG, "channels = %"PRIu16"\n", ape_ctx->channels);
00124 av_log(s, AV_LOG_DEBUG, "samplerate = %"PRIu32"\n", ape_ctx->samplerate);
00125
00126 av_log(s, AV_LOG_DEBUG, "\nSeektable\n\n");
00127 if ((ape_ctx->seektablelength / sizeof(uint32_t)) != ape_ctx->totalframes) {
00128 av_log(s, AV_LOG_DEBUG, "No seektable\n");
00129 } else {
00130 for (i = 0; i < ape_ctx->seektablelength / sizeof(uint32_t); i++) {
00131 if (i < ape_ctx->totalframes - 1) {
00132 av_log(s, AV_LOG_DEBUG, "%8d %d (%d bytes)\n", i, ape_ctx->seektable[i], ape_ctx->seektable[i + 1] - ape_ctx->seektable[i]);
00133 } else {
00134 av_log(s, AV_LOG_DEBUG, "%8d %d\n", i, ape_ctx->seektable[i]);
00135 }
00136 }
00137 }
00138
00139 av_log(s, AV_LOG_DEBUG, "\nFrames\n\n");
00140 for (i = 0; i < ape_ctx->totalframes; i++)
00141 av_log(s, AV_LOG_DEBUG, "%8d %8"PRId64" %8d (%d samples)\n", i,
00142 ape_ctx->frames[i].pos, ape_ctx->frames[i].size,
00143 ape_ctx->frames[i].nblocks);
00144
00145 av_log(s, AV_LOG_DEBUG, "\nCalculated information:\n\n");
00146 av_log(s, AV_LOG_DEBUG, "junklength = %"PRIu32"\n", ape_ctx->junklength);
00147 av_log(s, AV_LOG_DEBUG, "firstframe = %"PRIu32"\n", ape_ctx->firstframe);
00148 av_log(s, AV_LOG_DEBUG, "totalsamples = %"PRIu32"\n", ape_ctx->totalsamples);
00149 #endif
00150 }
00151
00152 static int ape_read_header(AVFormatContext * s, AVFormatParameters * ap)
00153 {
00154 AVIOContext *pb = s->pb;
00155 APEContext *ape = s->priv_data;
00156 AVStream *st;
00157 uint32_t tag;
00158 int i;
00159 int total_blocks;
00160 int64_t pts;
00161
00162
00163 ape->junklength = avio_tell(pb);
00164
00165 tag = avio_rl32(pb);
00166 if (tag != MKTAG('M', 'A', 'C', ' '))
00167 return -1;
00168
00169 ape->fileversion = avio_rl16(pb);
00170
00171 if (ape->fileversion < APE_MIN_VERSION || ape->fileversion > APE_MAX_VERSION) {
00172 av_log(s, AV_LOG_ERROR, "Unsupported file version - %"PRId16".%02"PRId16"\n",
00173 ape->fileversion / 1000, (ape->fileversion % 1000) / 10);
00174 return -1;
00175 }
00176
00177 if (ape->fileversion >= 3980) {
00178 ape->padding1 = avio_rl16(pb);
00179 ape->descriptorlength = avio_rl32(pb);
00180 ape->headerlength = avio_rl32(pb);
00181 ape->seektablelength = avio_rl32(pb);
00182 ape->wavheaderlength = avio_rl32(pb);
00183 ape->audiodatalength = avio_rl32(pb);
00184 ape->audiodatalength_high = avio_rl32(pb);
00185 ape->wavtaillength = avio_rl32(pb);
00186 avio_read(pb, ape->md5, 16);
00187
00188
00189
00190 if (ape->descriptorlength > 52)
00191 avio_skip(pb, ape->descriptorlength - 52);
00192
00193
00194 ape->compressiontype = avio_rl16(pb);
00195 ape->formatflags = avio_rl16(pb);
00196 ape->blocksperframe = avio_rl32(pb);
00197 ape->finalframeblocks = avio_rl32(pb);
00198 ape->totalframes = avio_rl32(pb);
00199 ape->bps = avio_rl16(pb);
00200 ape->channels = avio_rl16(pb);
00201 ape->samplerate = avio_rl32(pb);
00202 } else {
00203 ape->descriptorlength = 0;
00204 ape->headerlength = 32;
00205
00206 ape->compressiontype = avio_rl16(pb);
00207 ape->formatflags = avio_rl16(pb);
00208 ape->channels = avio_rl16(pb);
00209 ape->samplerate = avio_rl32(pb);
00210 ape->wavheaderlength = avio_rl32(pb);
00211 ape->wavtaillength = avio_rl32(pb);
00212 ape->totalframes = avio_rl32(pb);
00213 ape->finalframeblocks = avio_rl32(pb);
00214
00215 if (ape->formatflags & MAC_FORMAT_FLAG_HAS_PEAK_LEVEL) {
00216 avio_skip(pb, 4);
00217 ape->headerlength += 4;
00218 }
00219
00220 if (ape->formatflags & MAC_FORMAT_FLAG_HAS_SEEK_ELEMENTS) {
00221 ape->seektablelength = avio_rl32(pb);
00222 ape->headerlength += 4;
00223 ape->seektablelength *= sizeof(int32_t);
00224 } else
00225 ape->seektablelength = ape->totalframes * sizeof(int32_t);
00226
00227 if (ape->formatflags & MAC_FORMAT_FLAG_8_BIT)
00228 ape->bps = 8;
00229 else if (ape->formatflags & MAC_FORMAT_FLAG_24_BIT)
00230 ape->bps = 24;
00231 else
00232 ape->bps = 16;
00233
00234 if (ape->fileversion >= 3950)
00235 ape->blocksperframe = 73728 * 4;
00236 else if (ape->fileversion >= 3900 || (ape->fileversion >= 3800 && ape->compressiontype >= 4000))
00237 ape->blocksperframe = 73728;
00238 else
00239 ape->blocksperframe = 9216;
00240
00241
00242 if (!(ape->formatflags & MAC_FORMAT_FLAG_CREATE_WAV_HEADER))
00243 avio_skip(pb, ape->wavheaderlength);
00244 }
00245
00246 if(!ape->totalframes){
00247 av_log(s, AV_LOG_ERROR, "No frames in the file!\n");
00248 return AVERROR(EINVAL);
00249 }
00250 if(ape->totalframes > UINT_MAX / sizeof(APEFrame)){
00251 av_log(s, AV_LOG_ERROR, "Too many frames: %"PRIu32"\n",
00252 ape->totalframes);
00253 return -1;
00254 }
00255 if (ape->seektablelength && (ape->seektablelength / sizeof(*ape->seektable)) < ape->totalframes) {
00256 av_log(s, AV_LOG_ERROR, "Number of seek entries is less than number of frames: %ld vs. %"PRIu32"\n",
00257 ape->seektablelength / sizeof(*ape->seektable), ape->totalframes);
00258 return AVERROR_INVALIDDATA;
00259 }
00260 ape->frames = av_malloc(ape->totalframes * sizeof(APEFrame));
00261 if(!ape->frames)
00262 return AVERROR(ENOMEM);
00263 ape->firstframe = ape->junklength + ape->descriptorlength + ape->headerlength + ape->seektablelength + ape->wavheaderlength;
00264 ape->currentframe = 0;
00265
00266
00267 ape->totalsamples = ape->finalframeblocks;
00268 if (ape->totalframes > 1)
00269 ape->totalsamples += ape->blocksperframe * (ape->totalframes - 1);
00270
00271 if (ape->seektablelength > 0) {
00272 ape->seektable = av_malloc(ape->seektablelength);
00273 if (!ape->seektable)
00274 return AVERROR(ENOMEM);
00275 for (i = 0; i < ape->seektablelength / sizeof(uint32_t); i++)
00276 ape->seektable[i] = avio_rl32(pb);
00277 }
00278
00279 ape->frames[0].pos = ape->firstframe;
00280 ape->frames[0].nblocks = ape->blocksperframe;
00281 ape->frames[0].skip = 0;
00282 for (i = 1; i < ape->totalframes; i++) {
00283 ape->frames[i].pos = ape->seektable[i] + ape->junklength;
00284 ape->frames[i].nblocks = ape->blocksperframe;
00285 ape->frames[i - 1].size = ape->frames[i].pos - ape->frames[i - 1].pos;
00286 ape->frames[i].skip = (ape->frames[i].pos - ape->frames[0].pos) & 3;
00287 }
00288 ape->frames[ape->totalframes - 1].size = ape->finalframeblocks * 4;
00289 ape->frames[ape->totalframes - 1].nblocks = ape->finalframeblocks;
00290
00291 for (i = 0; i < ape->totalframes; i++) {
00292 if(ape->frames[i].skip){
00293 ape->frames[i].pos -= ape->frames[i].skip;
00294 ape->frames[i].size += ape->frames[i].skip;
00295 }
00296 ape->frames[i].size = (ape->frames[i].size + 3) & ~3;
00297 }
00298
00299
00300 ape_dumpinfo(s, ape);
00301
00302
00303 if (pb->seekable) {
00304 ff_ape_parse_tag(s);
00305 avio_seek(pb, 0, SEEK_SET);
00306 }
00307
00308 av_log(s, AV_LOG_DEBUG, "Decoding file - v%d.%02d, compression level %"PRIu16"\n",
00309 ape->fileversion / 1000, (ape->fileversion % 1000) / 10,
00310 ape->compressiontype);
00311
00312
00313 st = av_new_stream(s, 0);
00314 if (!st)
00315 return -1;
00316
00317 total_blocks = (ape->totalframes == 0) ? 0 : ((ape->totalframes - 1) * ape->blocksperframe) + ape->finalframeblocks;
00318
00319 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
00320 st->codec->codec_id = CODEC_ID_APE;
00321 st->codec->codec_tag = MKTAG('A', 'P', 'E', ' ');
00322 st->codec->channels = ape->channels;
00323 st->codec->sample_rate = ape->samplerate;
00324 st->codec->bits_per_coded_sample = ape->bps;
00325 st->codec->frame_size = MAC_SUBFRAME_SIZE;
00326
00327 st->nb_frames = ape->totalframes;
00328 st->start_time = 0;
00329 st->duration = total_blocks / MAC_SUBFRAME_SIZE;
00330 av_set_pts_info(st, 64, MAC_SUBFRAME_SIZE, ape->samplerate);
00331
00332 st->codec->extradata = av_malloc(APE_EXTRADATA_SIZE);
00333 st->codec->extradata_size = APE_EXTRADATA_SIZE;
00334 AV_WL16(st->codec->extradata + 0, ape->fileversion);
00335 AV_WL16(st->codec->extradata + 2, ape->compressiontype);
00336 AV_WL16(st->codec->extradata + 4, ape->formatflags);
00337
00338 pts = 0;
00339 for (i = 0; i < ape->totalframes; i++) {
00340 ape->frames[i].pts = pts;
00341 av_add_index_entry(st, ape->frames[i].pos, ape->frames[i].pts, 0, 0, AVINDEX_KEYFRAME);
00342 pts += ape->blocksperframe / MAC_SUBFRAME_SIZE;
00343 }
00344
00345 return 0;
00346 }
00347
00348 static int ape_read_packet(AVFormatContext * s, AVPacket * pkt)
00349 {
00350 int ret;
00351 int nblocks;
00352 APEContext *ape = s->priv_data;
00353 uint32_t extra_size = 8;
00354
00355 if (url_feof(s->pb))
00356 return AVERROR(EIO);
00357 if (ape->currentframe > ape->totalframes)
00358 return AVERROR(EIO);
00359
00360 avio_seek (s->pb, ape->frames[ape->currentframe].pos, SEEK_SET);
00361
00362
00363 if (ape->currentframe == (ape->totalframes - 1))
00364 nblocks = ape->finalframeblocks;
00365 else
00366 nblocks = ape->blocksperframe;
00367
00368 if (av_new_packet(pkt, ape->frames[ape->currentframe].size + extra_size) < 0)
00369 return AVERROR(ENOMEM);
00370
00371 AV_WL32(pkt->data , nblocks);
00372 AV_WL32(pkt->data + 4, ape->frames[ape->currentframe].skip);
00373 ret = avio_read(s->pb, pkt->data + extra_size, ape->frames[ape->currentframe].size);
00374
00375 pkt->pts = ape->frames[ape->currentframe].pts;
00376 pkt->stream_index = 0;
00377
00378
00379
00380 pkt->size = ret + extra_size;
00381
00382 ape->currentframe++;
00383
00384 return 0;
00385 }
00386
00387 static int ape_read_close(AVFormatContext * s)
00388 {
00389 APEContext *ape = s->priv_data;
00390
00391 av_freep(&ape->frames);
00392 av_freep(&ape->seektable);
00393 return 0;
00394 }
00395
00396 static int ape_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
00397 {
00398 AVStream *st = s->streams[stream_index];
00399 APEContext *ape = s->priv_data;
00400 int index = av_index_search_timestamp(st, timestamp, flags);
00401
00402 if (index < 0)
00403 return -1;
00404
00405 ape->currentframe = index;
00406 return 0;
00407 }
00408
00409 AVInputFormat ff_ape_demuxer = {
00410 "ape",
00411 NULL_IF_CONFIG_SMALL("Monkey's Audio"),
00412 sizeof(APEContext),
00413 ape_probe,
00414 ape_read_header,
00415 ape_read_packet,
00416 ape_read_close,
00417 ape_read_seek,
00418 .extensions = "ape,apl,mac"
00419 };