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00028 #include "avformat.h"
00029 #include "internal.h"
00030 #include "riff.h"
00031 #include "isom.h"
00032 #include "libavutil/intreadwrite.h"
00033 #include "libavutil/intfloat.h"
00034 #include "libavutil/dict.h"
00035 #include "caf.h"
00036
00037 typedef struct {
00038 int bytes_per_packet;
00039 int frames_per_packet;
00040 int64_t num_bytes;
00041
00042 int64_t packet_cnt;
00043 int64_t frame_cnt;
00044
00045 int64_t data_start;
00046 int64_t data_size;
00047 } CaffContext;
00048
00049 static int probe(AVProbeData *p)
00050 {
00051 if (AV_RB32(p->buf) == MKBETAG('c','a','f','f') && AV_RB16(&p->buf[4]) == 1)
00052 return AVPROBE_SCORE_MAX;
00053 return 0;
00054 }
00055
00057 static int read_desc_chunk(AVFormatContext *s)
00058 {
00059 AVIOContext *pb = s->pb;
00060 CaffContext *caf = s->priv_data;
00061 AVStream *st;
00062 int flags;
00063
00064
00065 st = avformat_new_stream(s, NULL);
00066 if (!st)
00067 return AVERROR(ENOMEM);
00068
00069
00070 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
00071 st->codec->sample_rate = av_int2double(avio_rb64(pb));
00072 st->codec->codec_tag = avio_rb32(pb);
00073 flags = avio_rb32(pb);
00074 caf->bytes_per_packet = avio_rb32(pb);
00075 st->codec->block_align = caf->bytes_per_packet;
00076 caf->frames_per_packet = avio_rb32(pb);
00077 st->codec->channels = avio_rb32(pb);
00078 st->codec->bits_per_coded_sample = avio_rb32(pb);
00079
00080
00081 if (caf->frames_per_packet > 0 && caf->bytes_per_packet > 0) {
00082 st->codec->bit_rate = (uint64_t)st->codec->sample_rate * (uint64_t)caf->bytes_per_packet * 8
00083 / (uint64_t)caf->frames_per_packet;
00084 } else {
00085 st->codec->bit_rate = 0;
00086 }
00087
00088
00089 if (st->codec->codec_tag == MKBETAG('l','p','c','m'))
00090 st->codec->codec_id = ff_mov_get_lpcm_codec_id(st->codec->bits_per_coded_sample, (flags ^ 0x2) | 0x4);
00091 else
00092 st->codec->codec_id = ff_codec_get_id(ff_codec_caf_tags, st->codec->codec_tag);
00093 return 0;
00094 }
00095
00097 static int read_kuki_chunk(AVFormatContext *s, int64_t size)
00098 {
00099 AVIOContext *pb = s->pb;
00100 AVStream *st = s->streams[0];
00101
00102 if (size < 0 || size > INT_MAX - FF_INPUT_BUFFER_PADDING_SIZE)
00103 return -1;
00104
00105 if (st->codec->codec_id == CODEC_ID_AAC) {
00106
00107
00108
00109 int strt, skip;
00110 MOVAtom atom;
00111
00112 strt = avio_tell(pb);
00113 ff_mov_read_esds(s, pb, atom);
00114 skip = size - (avio_tell(pb) - strt);
00115 if (skip < 0 || !st->codec->extradata ||
00116 st->codec->codec_id != CODEC_ID_AAC) {
00117 av_log(s, AV_LOG_ERROR, "invalid AAC magic cookie\n");
00118 return AVERROR_INVALIDDATA;
00119 }
00120 avio_skip(pb, skip);
00121 } else if (st->codec->codec_id == CODEC_ID_ALAC) {
00122 #define ALAC_PREAMBLE 12
00123 #define ALAC_HEADER 36
00124 if (size < ALAC_PREAMBLE + ALAC_HEADER) {
00125 av_log(s, AV_LOG_ERROR, "invalid ALAC magic cookie\n");
00126 avio_skip(pb, size);
00127 return AVERROR_INVALIDDATA;
00128 }
00129 avio_skip(pb, ALAC_PREAMBLE);
00130 st->codec->extradata = av_mallocz(ALAC_HEADER + FF_INPUT_BUFFER_PADDING_SIZE);
00131 if (!st->codec->extradata)
00132 return AVERROR(ENOMEM);
00133 avio_read(pb, st->codec->extradata, ALAC_HEADER);
00134 st->codec->extradata_size = ALAC_HEADER;
00135 avio_skip(pb, size - ALAC_PREAMBLE - ALAC_HEADER);
00136 } else {
00137 st->codec->extradata = av_mallocz(size + FF_INPUT_BUFFER_PADDING_SIZE);
00138 if (!st->codec->extradata)
00139 return AVERROR(ENOMEM);
00140 avio_read(pb, st->codec->extradata, size);
00141 st->codec->extradata_size = size;
00142 }
00143
00144 return 0;
00145 }
00146
00148 static int read_pakt_chunk(AVFormatContext *s, int64_t size)
00149 {
00150 AVIOContext *pb = s->pb;
00151 AVStream *st = s->streams[0];
00152 CaffContext *caf = s->priv_data;
00153 int64_t pos = 0, ccount;
00154 int num_packets, i;
00155
00156 ccount = avio_tell(pb);
00157
00158 num_packets = avio_rb64(pb);
00159 if (num_packets < 0 || INT32_MAX / sizeof(AVIndexEntry) < num_packets)
00160 return AVERROR_INVALIDDATA;
00161
00162 st->nb_frames = avio_rb64(pb);
00163 st->nb_frames += avio_rb32(pb);
00164 st->nb_frames += avio_rb32(pb);
00165
00166 st->duration = 0;
00167 for (i = 0; i < num_packets; i++) {
00168 av_add_index_entry(s->streams[0], pos, st->duration, 0, 0, AVINDEX_KEYFRAME);
00169 pos += caf->bytes_per_packet ? caf->bytes_per_packet : ff_mp4_read_descr_len(pb);
00170 st->duration += caf->frames_per_packet ? caf->frames_per_packet : ff_mp4_read_descr_len(pb);
00171 }
00172
00173 if (avio_tell(pb) - ccount != size) {
00174 av_log(s, AV_LOG_ERROR, "error reading packet table\n");
00175 return -1;
00176 }
00177
00178 caf->num_bytes = pos;
00179 return 0;
00180 }
00181
00183 static void read_info_chunk(AVFormatContext *s, int64_t size)
00184 {
00185 AVIOContext *pb = s->pb;
00186 unsigned int i;
00187 unsigned int nb_entries = avio_rb32(pb);
00188 for (i = 0; i < nb_entries; i++) {
00189 char key[32];
00190 char value[1024];
00191 avio_get_str(pb, INT_MAX, key, sizeof(key));
00192 avio_get_str(pb, INT_MAX, value, sizeof(value));
00193 av_dict_set(&s->metadata, key, value, 0);
00194 }
00195 }
00196
00197 static int read_header(AVFormatContext *s,
00198 AVFormatParameters *ap)
00199 {
00200 AVIOContext *pb = s->pb;
00201 CaffContext *caf = s->priv_data;
00202 AVStream *st;
00203 uint32_t tag = 0;
00204 int found_data, ret;
00205 int64_t size;
00206
00207 avio_skip(pb, 8);
00208
00209
00210 if (avio_rb32(pb) != MKBETAG('d','e','s','c')) {
00211 av_log(s, AV_LOG_ERROR, "desc chunk not present\n");
00212 return AVERROR_INVALIDDATA;
00213 }
00214 size = avio_rb64(pb);
00215 if (size != 32)
00216 return AVERROR_INVALIDDATA;
00217
00218 ret = read_desc_chunk(s);
00219 if (ret)
00220 return ret;
00221 st = s->streams[0];
00222
00223
00224 found_data = 0;
00225 while (!pb->eof_reached) {
00226
00227
00228
00229 if (found_data && (caf->data_size < 0 || !pb->seekable))
00230 break;
00231
00232 tag = avio_rb32(pb);
00233 size = avio_rb64(pb);
00234 if (pb->eof_reached)
00235 break;
00236
00237 switch (tag) {
00238 case MKBETAG('d','a','t','a'):
00239 avio_skip(pb, 4);
00240 caf->data_start = avio_tell(pb);
00241 caf->data_size = size < 0 ? -1 : size - 4;
00242 if (caf->data_size > 0 && pb->seekable)
00243 avio_skip(pb, caf->data_size);
00244 found_data = 1;
00245 break;
00246
00247
00248 case MKBETAG('k','u','k','i'):
00249 if (read_kuki_chunk(s, size))
00250 return AVERROR_INVALIDDATA;
00251 break;
00252
00253
00254 case MKBETAG('p','a','k','t'):
00255 if (read_pakt_chunk(s, size))
00256 return AVERROR_INVALIDDATA;
00257 break;
00258
00259 case MKBETAG('i','n','f','o'):
00260 read_info_chunk(s, size);
00261 break;
00262
00263 default:
00264 #define _(x) ((x) >= ' ' ? (x) : ' ')
00265 av_log(s, AV_LOG_WARNING, "skipping CAF chunk: %08X (%c%c%c%c)\n",
00266 tag, _(tag>>24), _((tag>>16)&0xFF), _((tag>>8)&0xFF), _(tag&0xFF));
00267 #undef _
00268 case MKBETAG('f','r','e','e'):
00269 if (size < 0)
00270 return AVERROR_INVALIDDATA;
00271 avio_skip(pb, size);
00272 break;
00273 }
00274 }
00275
00276 if (!found_data)
00277 return AVERROR_INVALIDDATA;
00278
00279 if (caf->bytes_per_packet > 0 && caf->frames_per_packet > 0) {
00280 if (caf->data_size > 0)
00281 st->nb_frames = (caf->data_size / caf->bytes_per_packet) * caf->frames_per_packet;
00282 } else if (st->nb_index_entries) {
00283 st->codec->bit_rate = st->codec->sample_rate * caf->data_size * 8 /
00284 st->duration;
00285 } else {
00286 av_log(s, AV_LOG_ERROR, "Missing packet table. It is required when "
00287 "block size or frame size are variable.\n");
00288 return AVERROR_INVALIDDATA;
00289 }
00290
00291 avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
00292 st->start_time = 0;
00293
00294
00295 if (caf->data_size >= 0)
00296 avio_seek(pb, caf->data_start, SEEK_SET);
00297
00298 return 0;
00299 }
00300
00301 #define CAF_MAX_PKT_SIZE 4096
00302
00303 static int read_packet(AVFormatContext *s, AVPacket *pkt)
00304 {
00305 AVIOContext *pb = s->pb;
00306 AVStream *st = s->streams[0];
00307 CaffContext *caf = s->priv_data;
00308 int res, pkt_size = 0, pkt_frames = 0;
00309 int64_t left = CAF_MAX_PKT_SIZE;
00310
00311 if (pb->eof_reached)
00312 return AVERROR(EIO);
00313
00314
00315 if (caf->data_size > 0) {
00316 left = (caf->data_start + caf->data_size) - avio_tell(pb);
00317 if (left <= 0)
00318 return AVERROR(EIO);
00319 }
00320
00321 pkt_frames = caf->frames_per_packet;
00322 pkt_size = caf->bytes_per_packet;
00323
00324 if (pkt_size > 0 && pkt_frames == 1) {
00325 pkt_size = (CAF_MAX_PKT_SIZE / pkt_size) * pkt_size;
00326 pkt_size = FFMIN(pkt_size, left);
00327 pkt_frames = pkt_size / caf->bytes_per_packet;
00328 } else if (st->nb_index_entries) {
00329 if (caf->packet_cnt < st->nb_index_entries - 1) {
00330 pkt_size = st->index_entries[caf->packet_cnt + 1].pos - st->index_entries[caf->packet_cnt].pos;
00331 pkt_frames = st->index_entries[caf->packet_cnt + 1].timestamp - st->index_entries[caf->packet_cnt].timestamp;
00332 } else if (caf->packet_cnt == st->nb_index_entries - 1) {
00333 pkt_size = caf->num_bytes - st->index_entries[caf->packet_cnt].pos;
00334 pkt_frames = st->duration - st->index_entries[caf->packet_cnt].timestamp;
00335 } else {
00336 return AVERROR(EIO);
00337 }
00338 }
00339
00340 if (pkt_size == 0 || pkt_frames == 0 || pkt_size > left)
00341 return AVERROR(EIO);
00342
00343 res = av_get_packet(pb, pkt, pkt_size);
00344 if (res < 0)
00345 return res;
00346
00347 pkt->size = res;
00348 pkt->stream_index = 0;
00349 pkt->dts = pkt->pts = caf->frame_cnt;
00350
00351 caf->packet_cnt++;
00352 caf->frame_cnt += pkt_frames;
00353
00354 return 0;
00355 }
00356
00357 static int read_seek(AVFormatContext *s, int stream_index,
00358 int64_t timestamp, int flags)
00359 {
00360 AVStream *st = s->streams[0];
00361 CaffContext *caf = s->priv_data;
00362 int64_t pos;
00363
00364 timestamp = FFMAX(timestamp, 0);
00365
00366 if (caf->frames_per_packet > 0 && caf->bytes_per_packet > 0) {
00367
00368 pos = caf->bytes_per_packet * timestamp / caf->frames_per_packet;
00369 if (caf->data_size > 0)
00370 pos = FFMIN(pos, caf->data_size);
00371 caf->packet_cnt = pos / caf->bytes_per_packet;
00372 caf->frame_cnt = caf->frames_per_packet * caf->packet_cnt;
00373 } else if (st->nb_index_entries) {
00374 caf->packet_cnt = av_index_search_timestamp(st, timestamp, flags);
00375 caf->frame_cnt = st->index_entries[caf->packet_cnt].timestamp;
00376 pos = st->index_entries[caf->packet_cnt].pos;
00377 } else {
00378 return -1;
00379 }
00380
00381 avio_seek(s->pb, pos + caf->data_start, SEEK_SET);
00382 return 0;
00383 }
00384
00385 AVInputFormat ff_caf_demuxer = {
00386 .name = "caf",
00387 .long_name = NULL_IF_CONFIG_SMALL("Apple Core Audio Format"),
00388 .priv_data_size = sizeof(CaffContext),
00389 .read_probe = probe,
00390 .read_header = read_header,
00391 .read_packet = read_packet,
00392 .read_seek = read_seek,
00393 .codec_tag = (const AVCodecTag*[]){ff_codec_caf_tags, 0},
00394 };