00001
00002
00003
00004
00005
00006
00007
00008
00009
00010
00011
00012
00013
00014
00015
00016
00017
00018
00019
00020
00021
00022
00028 #include "avformat.h"
00029 #include "riff.h"
00030 #include "isom.h"
00031 #include "libavutil/intreadwrite.h"
00032 #include "caf.h"
00033
00034 typedef struct {
00035 int bytes_per_packet;
00036 int frames_per_packet;
00037 int64_t num_bytes;
00038
00039 int64_t packet_cnt;
00040 int64_t frame_cnt;
00041
00042 int64_t data_start;
00043 int64_t data_size;
00044 } CaffContext;
00045
00046 static int probe(AVProbeData *p)
00047 {
00048 if (AV_RB32(p->buf) == MKBETAG('c','a','f','f') && AV_RB16(&p->buf[4]) == 1)
00049 return AVPROBE_SCORE_MAX;
00050 return 0;
00051 }
00052
00054 static int read_desc_chunk(AVFormatContext *s)
00055 {
00056 AVIOContext *pb = s->pb;
00057 CaffContext *caf = s->priv_data;
00058 AVStream *st;
00059 int flags;
00060
00061
00062 st = av_new_stream(s, 0);
00063 if (!st)
00064 return AVERROR(ENOMEM);
00065
00066
00067 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
00068 st->codec->sample_rate = av_int2dbl(avio_rb64(pb));
00069 st->codec->codec_tag = avio_rb32(pb);
00070 flags = avio_rb32(pb);
00071 caf->bytes_per_packet = avio_rb32(pb);
00072 st->codec->block_align = caf->bytes_per_packet;
00073 caf->frames_per_packet = avio_rb32(pb);
00074 st->codec->channels = avio_rb32(pb);
00075 st->codec->bits_per_coded_sample = avio_rb32(pb);
00076
00077
00078 if (caf->frames_per_packet > 0 && caf->bytes_per_packet > 0) {
00079 st->codec->bit_rate = (uint64_t)st->codec->sample_rate * (uint64_t)caf->bytes_per_packet * 8
00080 / (uint64_t)caf->frames_per_packet;
00081 } else {
00082 st->codec->bit_rate = 0;
00083 }
00084
00085
00086 if (st->codec->codec_tag == MKBETAG('l','p','c','m'))
00087 st->codec->codec_id = ff_mov_get_lpcm_codec_id(st->codec->bits_per_coded_sample, (flags ^ 0x2) | 0x4);
00088 else
00089 st->codec->codec_id = ff_codec_get_id(ff_codec_caf_tags, st->codec->codec_tag);
00090 return 0;
00091 }
00092
00094 static int read_kuki_chunk(AVFormatContext *s, int64_t size)
00095 {
00096 AVIOContext *pb = s->pb;
00097 AVStream *st = s->streams[0];
00098
00099 if (size < 0 || size > INT_MAX - FF_INPUT_BUFFER_PADDING_SIZE)
00100 return -1;
00101
00102 if (st->codec->codec_id == CODEC_ID_AAC) {
00103
00104
00105
00106 int strt, skip;
00107 MOVAtom atom;
00108
00109 strt = avio_tell(pb);
00110 ff_mov_read_esds(s, pb, atom);
00111 skip = size - (avio_tell(pb) - strt);
00112 if (skip < 0 || !st->codec->extradata ||
00113 st->codec->codec_id != CODEC_ID_AAC) {
00114 av_log(s, AV_LOG_ERROR, "invalid AAC magic cookie\n");
00115 return AVERROR_INVALIDDATA;
00116 }
00117 avio_seek(pb, skip, SEEK_CUR);
00118 } else if (st->codec->codec_id == CODEC_ID_ALAC) {
00119 #define ALAC_PREAMBLE 12
00120 #define ALAC_HEADER 36
00121 if (size < ALAC_PREAMBLE + ALAC_HEADER) {
00122 av_log(s, AV_LOG_ERROR, "invalid ALAC magic cookie\n");
00123 avio_seek(pb, size, SEEK_CUR);
00124 return AVERROR_INVALIDDATA;
00125 }
00126 avio_seek(pb, ALAC_PREAMBLE, SEEK_CUR);
00127 st->codec->extradata = av_mallocz(ALAC_HEADER + FF_INPUT_BUFFER_PADDING_SIZE);
00128 if (!st->codec->extradata)
00129 return AVERROR(ENOMEM);
00130 avio_read(pb, st->codec->extradata, ALAC_HEADER);
00131 st->codec->extradata_size = ALAC_HEADER;
00132 avio_seek(pb, size - ALAC_PREAMBLE - ALAC_HEADER, SEEK_CUR);
00133 } else {
00134 st->codec->extradata = av_mallocz(size + FF_INPUT_BUFFER_PADDING_SIZE);
00135 if (!st->codec->extradata)
00136 return AVERROR(ENOMEM);
00137 avio_read(pb, st->codec->extradata, size);
00138 st->codec->extradata_size = size;
00139 }
00140
00141 return 0;
00142 }
00143
00145 static int read_pakt_chunk(AVFormatContext *s, int64_t size)
00146 {
00147 AVIOContext *pb = s->pb;
00148 AVStream *st = s->streams[0];
00149 CaffContext *caf = s->priv_data;
00150 int64_t pos = 0, ccount;
00151 int num_packets, i;
00152
00153 ccount = avio_tell(pb);
00154
00155 num_packets = avio_rb64(pb);
00156 if (num_packets < 0 || INT32_MAX / sizeof(AVIndexEntry) < num_packets)
00157 return AVERROR_INVALIDDATA;
00158
00159 st->nb_frames = avio_rb64(pb);
00160 st->nb_frames += avio_rb32(pb);
00161 st->nb_frames += avio_rb32(pb);
00162
00163 st->duration = 0;
00164 for (i = 0; i < num_packets; i++) {
00165 av_add_index_entry(s->streams[0], pos, st->duration, 0, 0, AVINDEX_KEYFRAME);
00166 pos += caf->bytes_per_packet ? caf->bytes_per_packet : ff_mp4_read_descr_len(pb);
00167 st->duration += caf->frames_per_packet ? caf->frames_per_packet : ff_mp4_read_descr_len(pb);
00168 }
00169
00170 if (avio_tell(pb) - ccount != size) {
00171 av_log(s, AV_LOG_ERROR, "error reading packet table\n");
00172 return -1;
00173 }
00174
00175 caf->num_bytes = pos;
00176 return 0;
00177 }
00178
00180 static void read_info_chunk(AVFormatContext *s, int64_t size)
00181 {
00182 AVIOContext *pb = s->pb;
00183 unsigned int i;
00184 unsigned int nb_entries = avio_rb32(pb);
00185 for (i = 0; i < nb_entries; i++) {
00186 char key[32];
00187 char value[1024];
00188 avio_get_str(pb, INT_MAX, key, sizeof(key));
00189 avio_get_str(pb, INT_MAX, value, sizeof(value));
00190 av_metadata_set2(&s->metadata, key, value, 0);
00191 }
00192 }
00193
00194 static int read_header(AVFormatContext *s,
00195 AVFormatParameters *ap)
00196 {
00197 AVIOContext *pb = s->pb;
00198 CaffContext *caf = s->priv_data;
00199 AVStream *st;
00200 uint32_t tag = 0;
00201 int found_data, ret;
00202 int64_t size;
00203
00204 avio_seek(pb, 8, SEEK_CUR);
00205
00206
00207 if (avio_rb32(pb) != MKBETAG('d','e','s','c')) {
00208 av_log(s, AV_LOG_ERROR, "desc chunk not present\n");
00209 return AVERROR_INVALIDDATA;
00210 }
00211 size = avio_rb64(pb);
00212 if (size != 32)
00213 return AVERROR_INVALIDDATA;
00214
00215 ret = read_desc_chunk(s);
00216 if (ret)
00217 return ret;
00218 st = s->streams[0];
00219
00220
00221 found_data = 0;
00222 while (!url_feof(pb)) {
00223
00224
00225
00226 if (found_data && (caf->data_size < 0 || url_is_streamed(pb)))
00227 break;
00228
00229 tag = avio_rb32(pb);
00230 size = avio_rb64(pb);
00231 if (url_feof(pb))
00232 break;
00233
00234 switch (tag) {
00235 case MKBETAG('d','a','t','a'):
00236 avio_seek(pb, 4, SEEK_CUR);
00237 caf->data_start = avio_tell(pb);
00238 caf->data_size = size < 0 ? -1 : size - 4;
00239 if (caf->data_size > 0 && !url_is_streamed(pb))
00240 avio_seek(pb, caf->data_size, SEEK_CUR);
00241 found_data = 1;
00242 break;
00243
00244
00245 case MKBETAG('k','u','k','i'):
00246 if (read_kuki_chunk(s, size))
00247 return AVERROR_INVALIDDATA;
00248 break;
00249
00250
00251 case MKBETAG('p','a','k','t'):
00252 if (read_pakt_chunk(s, size))
00253 return AVERROR_INVALIDDATA;
00254 break;
00255
00256 case MKBETAG('i','n','f','o'):
00257 read_info_chunk(s, size);
00258 break;
00259
00260 default:
00261 #define _(x) ((x) >= ' ' ? (x) : ' ')
00262 av_log(s, AV_LOG_WARNING, "skipping CAF chunk: %08X (%c%c%c%c)\n",
00263 tag, _(tag>>24), _((tag>>16)&0xFF), _((tag>>8)&0xFF), _(tag&0xFF));
00264 #undef _
00265 case MKBETAG('f','r','e','e'):
00266 if (size < 0)
00267 return AVERROR_INVALIDDATA;
00268 avio_seek(pb, size, SEEK_CUR);
00269 break;
00270 }
00271 }
00272
00273 if (!found_data)
00274 return AVERROR_INVALIDDATA;
00275
00276 if (caf->bytes_per_packet > 0 && caf->frames_per_packet > 0) {
00277 if (caf->data_size > 0)
00278 st->nb_frames = (caf->data_size / caf->bytes_per_packet) * caf->frames_per_packet;
00279 } else if (st->nb_index_entries) {
00280 st->codec->bit_rate = st->codec->sample_rate * caf->data_size * 8 /
00281 st->duration;
00282 } else {
00283 av_log(s, AV_LOG_ERROR, "Missing packet table. It is required when "
00284 "block size or frame size are variable.\n");
00285 return AVERROR_INVALIDDATA;
00286 }
00287 s->file_size = avio_size(pb);
00288 s->file_size = FFMAX(0, s->file_size);
00289
00290 av_set_pts_info(st, 64, 1, st->codec->sample_rate);
00291 st->start_time = 0;
00292
00293
00294 if (caf->data_size >= 0)
00295 avio_seek(pb, caf->data_start, SEEK_SET);
00296
00297 return 0;
00298 }
00299
00300 #define CAF_MAX_PKT_SIZE 4096
00301
00302 static int read_packet(AVFormatContext *s, AVPacket *pkt)
00303 {
00304 AVIOContext *pb = s->pb;
00305 AVStream *st = s->streams[0];
00306 CaffContext *caf = s->priv_data;
00307 int res, pkt_size = 0, pkt_frames = 0;
00308 int64_t left = CAF_MAX_PKT_SIZE;
00309
00310 if (url_feof(pb))
00311 return AVERROR(EIO);
00312
00313
00314 if (caf->data_size > 0) {
00315 left = (caf->data_start + caf->data_size) - avio_tell(pb);
00316 if (left <= 0)
00317 return AVERROR(EIO);
00318 }
00319
00320 pkt_frames = caf->frames_per_packet;
00321 pkt_size = caf->bytes_per_packet;
00322
00323 if (pkt_size > 0 && pkt_frames == 1) {
00324 pkt_size = (CAF_MAX_PKT_SIZE / pkt_size) * pkt_size;
00325 pkt_size = FFMIN(pkt_size, left);
00326 pkt_frames = pkt_size / caf->bytes_per_packet;
00327 } else if (st->nb_index_entries) {
00328 if (caf->packet_cnt < st->nb_index_entries - 1) {
00329 pkt_size = st->index_entries[caf->packet_cnt + 1].pos - st->index_entries[caf->packet_cnt].pos;
00330 pkt_frames = st->index_entries[caf->packet_cnt + 1].timestamp - st->index_entries[caf->packet_cnt].timestamp;
00331 } else if (caf->packet_cnt == st->nb_index_entries - 1) {
00332 pkt_size = caf->num_bytes - st->index_entries[caf->packet_cnt].pos;
00333 pkt_frames = st->duration - st->index_entries[caf->packet_cnt].timestamp;
00334 } else {
00335 return AVERROR(EIO);
00336 }
00337 }
00338
00339 if (pkt_size == 0 || pkt_frames == 0 || pkt_size > left)
00340 return AVERROR(EIO);
00341
00342 res = av_get_packet(pb, pkt, pkt_size);
00343 if (res < 0)
00344 return res;
00345
00346 pkt->size = res;
00347 pkt->stream_index = 0;
00348 pkt->dts = pkt->pts = caf->frame_cnt;
00349
00350 caf->packet_cnt++;
00351 caf->frame_cnt += pkt_frames;
00352
00353 return 0;
00354 }
00355
00356 static int read_seek(AVFormatContext *s, int stream_index,
00357 int64_t timestamp, int flags)
00358 {
00359 AVStream *st = s->streams[0];
00360 CaffContext *caf = s->priv_data;
00361 int64_t pos;
00362
00363 timestamp = FFMAX(timestamp, 0);
00364
00365 if (caf->frames_per_packet > 0 && caf->bytes_per_packet > 0) {
00366
00367 pos = caf->bytes_per_packet * timestamp / caf->frames_per_packet;
00368 if (caf->data_size > 0)
00369 pos = FFMIN(pos, caf->data_size);
00370 caf->packet_cnt = pos / caf->bytes_per_packet;
00371 caf->frame_cnt = caf->frames_per_packet * caf->packet_cnt;
00372 } else if (st->nb_index_entries) {
00373 caf->packet_cnt = av_index_search_timestamp(st, timestamp, flags);
00374 caf->frame_cnt = st->index_entries[caf->packet_cnt].timestamp;
00375 pos = st->index_entries[caf->packet_cnt].pos;
00376 } else {
00377 return -1;
00378 }
00379
00380 avio_seek(s->pb, pos + caf->data_start, SEEK_SET);
00381 return 0;
00382 }
00383
00384 AVInputFormat ff_caf_demuxer = {
00385 "caf",
00386 NULL_IF_CONFIG_SMALL("Apple Core Audio Format"),
00387 sizeof(CaffContext),
00388 probe,
00389 read_header,
00390 read_packet,
00391 NULL,
00392 read_seek,
00393 .codec_tag = (const AVCodecTag*[]){ff_codec_caf_tags, 0},
00394 };