3 * Copyright (c) 2006 Patrick Guimond
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 #include "libavutil/intreadwrite.h"
23 #include "libavutil/mathematics.h"
24 #include "libavutil/dict.h"
34 #define AIFF_C_VERSION1 0xA2805140
41 static enum AVCodecID aiff_codec_get_id(int bps)
44 return AV_CODEC_ID_PCM_S8;
46 return AV_CODEC_ID_PCM_S16BE;
48 return AV_CODEC_ID_PCM_S24BE;
50 return AV_CODEC_ID_PCM_S32BE;
52 /* bigger than 32 isn't allowed */
53 return AV_CODEC_ID_NONE;
56 /* returns the size of the found tag */
57 static int get_tag(AVIOContext *pb, uint32_t * tag)
73 /* Metadata string read */
74 static void get_meta(AVFormatContext *s, const char *key, int size)
76 uint8_t *str = av_malloc(size+1);
79 int res = avio_read(s->pb, str, size);
86 av_dict_set(&s->metadata, key, str, AV_DICT_DONT_STRDUP_VAL);
90 avio_skip(s->pb, size);
93 /* Returns the number of sound data frames or negative on error */
94 static unsigned int get_aiff_header(AVFormatContext *s, int size,
97 AVIOContext *pb = s->pb;
98 AVCodecContext *codec = s->streams[0]->codec;
99 AIFFInputContext *aiff = s->priv_data;
103 unsigned int num_frames;
107 codec->codec_type = AVMEDIA_TYPE_AUDIO;
108 codec->channels = avio_rb16(pb);
109 num_frames = avio_rb32(pb);
110 codec->bits_per_coded_sample = avio_rb16(pb);
114 sample_rate = ldexp(val, exp - 16383 - 63);
115 codec->sample_rate = sample_rate;
118 /* get codec id for AIFF-C */
119 if (version == AIFF_C_VERSION1) {
120 codec->codec_tag = avio_rl32(pb);
121 codec->codec_id = ff_codec_get_id(ff_codec_aiff_tags, codec->codec_tag);
125 if (version != AIFF_C_VERSION1 || codec->codec_id == AV_CODEC_ID_PCM_S16BE) {
126 codec->codec_id = aiff_codec_get_id(codec->bits_per_coded_sample);
127 codec->bits_per_coded_sample = av_get_bits_per_sample(codec->codec_id);
128 aiff->block_duration = 1;
130 switch (codec->codec_id) {
131 case AV_CODEC_ID_PCM_F32BE:
132 case AV_CODEC_ID_PCM_F64BE:
133 case AV_CODEC_ID_PCM_S16LE:
134 case AV_CODEC_ID_PCM_ALAW:
135 case AV_CODEC_ID_PCM_MULAW:
136 aiff->block_duration = 1;
138 case AV_CODEC_ID_ADPCM_IMA_QT:
139 codec->block_align = 34*codec->channels;
141 case AV_CODEC_ID_MACE3:
142 codec->block_align = 2*codec->channels;
144 case AV_CODEC_ID_MACE6:
145 codec->block_align = 1*codec->channels;
147 case AV_CODEC_ID_GSM:
148 codec->block_align = 33;
150 case AV_CODEC_ID_QCELP:
151 codec->block_align = 35;
154 aiff->block_duration = 1;
157 if (codec->block_align > 0)
158 aiff->block_duration = av_get_audio_frame_duration(codec,
162 /* Block align needs to be computed in all cases, as the definition
163 * is specific to applications -> here we use the WAVE format definition */
164 if (!codec->block_align)
165 codec->block_align = (av_get_bits_per_sample(codec->codec_id) * codec->channels) >> 3;
167 if (aiff->block_duration) {
168 codec->bit_rate = codec->sample_rate * (codec->block_align << 3) /
169 aiff->block_duration;
179 static int aiff_probe(AVProbeData *p)
181 /* check file header */
182 if (p->buf[0] == 'F' && p->buf[1] == 'O' &&
183 p->buf[2] == 'R' && p->buf[3] == 'M' &&
184 p->buf[8] == 'A' && p->buf[9] == 'I' &&
185 p->buf[10] == 'F' && (p->buf[11] == 'F' || p->buf[11] == 'C'))
186 return AVPROBE_SCORE_MAX;
192 static int aiff_read_header(AVFormatContext *s)
194 int ret, size, filesize;
195 int64_t offset = 0, position;
197 unsigned version = AIFF_C_VERSION1;
198 AVIOContext *pb = s->pb;
200 AIFFInputContext *aiff = s->priv_data;
201 ID3v2ExtraMeta *id3v2_extra_meta = NULL;
203 /* check FORM header */
204 filesize = get_tag(pb, &tag);
205 if (filesize < 0 || tag != MKTAG('F', 'O', 'R', 'M'))
206 return AVERROR_INVALIDDATA;
210 if (tag == MKTAG('A', 'I', 'F', 'F')) /* Got an AIFF file */
212 else if (tag != MKTAG('A', 'I', 'F', 'C')) /* An AIFF-C file then */
213 return AVERROR_INVALIDDATA;
217 st = avformat_new_stream(s, NULL);
219 return AVERROR(ENOMEM);
221 while (filesize > 0) {
222 /* parse different chunks */
223 size = get_tag(pb, &tag);
227 filesize -= size + 8;
230 case MKTAG('C', 'O', 'M', 'M'): /* Common chunk */
231 /* Then for the complete header info */
232 st->nb_frames = get_aiff_header(s, size, version);
233 if (st->nb_frames < 0)
234 return st->nb_frames;
235 if (offset > 0) // COMM is after SSND
238 case MKTAG('I', 'D', '3', ' '):
239 position = avio_tell(pb);
240 ff_id3v2_read(s, ID3v2_DEFAULT_MAGIC, &id3v2_extra_meta);
241 if (id3v2_extra_meta)
242 if ((ret = ff_id3v2_parse_apic(s, &id3v2_extra_meta)) < 0) {
243 ff_id3v2_free_extra_meta(&id3v2_extra_meta);
246 ff_id3v2_free_extra_meta(&id3v2_extra_meta);
247 if (position + size > avio_tell(pb))
248 avio_skip(pb, position + size - avio_tell(pb));
250 case MKTAG('F', 'V', 'E', 'R'): /* Version chunk */
251 version = avio_rb32(pb);
253 case MKTAG('N', 'A', 'M', 'E'): /* Sample name chunk */
254 get_meta(s, "title" , size);
256 case MKTAG('A', 'U', 'T', 'H'): /* Author chunk */
257 get_meta(s, "author" , size);
259 case MKTAG('(', 'c', ')', ' '): /* Copyright chunk */
260 get_meta(s, "copyright", size);
262 case MKTAG('A', 'N', 'N', 'O'): /* Annotation chunk */
263 get_meta(s, "comment" , size);
265 case MKTAG('S', 'S', 'N', 'D'): /* Sampled sound chunk */
266 aiff->data_end = avio_tell(pb) + size;
267 offset = avio_rb32(pb); /* Offset of sound data */
268 avio_rb32(pb); /* BlockSize... don't care */
269 offset += avio_tell(pb); /* Compute absolute data offset */
270 if (st->codec->block_align && !pb->seekable) /* Assume COMM already parsed */
273 av_log(s, AV_LOG_ERROR, "file is not seekable\n");
276 avio_skip(pb, size - 8);
278 case MKTAG('w', 'a', 'v', 'e'):
279 if ((uint64_t)size > (1<<30))
281 st->codec->extradata = av_mallocz(size + FF_INPUT_BUFFER_PADDING_SIZE);
282 if (!st->codec->extradata)
283 return AVERROR(ENOMEM);
284 st->codec->extradata_size = size;
285 avio_read(pb, st->codec->extradata, size);
286 if (st->codec->codec_id == AV_CODEC_ID_QDM2 && size>=12*4 && !st->codec->block_align) {
287 st->codec->block_align = AV_RB32(st->codec->extradata+11*4);
288 aiff->block_duration = AV_RB32(st->codec->extradata+9*4);
291 case MKTAG('C','H','A','N'):
292 if(ff_mov_read_chan(s, pb, st, size) < 0)
293 return AVERROR_INVALIDDATA;
296 if (size & 1) /* Always even aligned */
303 if (!st->codec->block_align) {
304 av_log(s, AV_LOG_ERROR, "could not find COMM tag or invalid block_align value\n");
308 /* Now positioned, get the sound data start and end */
309 avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
311 st->duration = st->nb_frames * aiff->block_duration;
313 /* Position the stream at the first block */
314 avio_seek(pb, offset, SEEK_SET);
319 #define MAX_SIZE 4096
321 static int aiff_read_packet(AVFormatContext *s,
324 AVStream *st = s->streams[0];
325 AIFFInputContext *aiff = s->priv_data;
329 /* calculate size of remaining data */
330 max_size = aiff->data_end - avio_tell(s->pb);
334 /* Now for that packet */
335 if (st->codec->block_align >= 33) // GSM, QCLP, IMA4
336 size = st->codec->block_align;
338 size = (MAX_SIZE / st->codec->block_align) * st->codec->block_align;
339 size = FFMIN(max_size, size);
340 res = av_get_packet(s->pb, pkt, size);
344 if (size >= st->codec->block_align)
345 pkt->flags &= ~AV_PKT_FLAG_CORRUPT;
346 /* Only one stream in an AIFF file */
347 pkt->stream_index = 0;
348 pkt->duration = (res / st->codec->block_align) * aiff->block_duration;
352 AVInputFormat ff_aiff_demuxer = {
354 .long_name = NULL_IF_CONFIG_SMALL("Audio IFF"),
355 .priv_data_size = sizeof(AIFFInputContext),
356 .read_probe = aiff_probe,
357 .read_header = aiff_read_header,
358 .read_packet = aiff_read_packet,
359 .read_seek = ff_pcm_read_seek,
360 .codec_tag = (const AVCodecTag* const []){ ff_codec_aiff_tags, 0 },