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/mathematics.h"
23 #include "libavutil/dict.h"
31 #define AIFF_C_VERSION1 0xA2805140
37 static enum CodecID aiff_codec_get_id(int bps)
40 return CODEC_ID_PCM_S8;
42 return CODEC_ID_PCM_S16BE;
44 return CODEC_ID_PCM_S24BE;
46 return CODEC_ID_PCM_S32BE;
48 /* bigger than 32 isn't allowed */
52 /* returns the size of the found tag */
53 static int get_tag(AVIOContext *pb, uint32_t * tag)
69 /* Metadata string read */
70 static void get_meta(AVFormatContext *s, const char *key, int size)
72 uint8_t *str = av_malloc(size+1);
75 int res = avio_read(s->pb, str, size);
82 av_dict_set(&s->metadata, key, str, AV_DICT_DONT_STRDUP_VAL);
86 avio_skip(s->pb, size);
89 /* Returns the number of sound data frames or negative on error */
90 static unsigned int get_aiff_header(AVIOContext *pb, AVCodecContext *codec,
91 int size, unsigned version)
96 unsigned int num_frames;
100 codec->codec_type = AVMEDIA_TYPE_AUDIO;
101 codec->channels = avio_rb16(pb);
102 num_frames = avio_rb32(pb);
103 codec->bits_per_coded_sample = avio_rb16(pb);
107 sample_rate = ldexp(val, exp - 16383 - 63);
108 codec->sample_rate = sample_rate;
112 if (version == AIFF_C_VERSION1) {
113 codec->codec_tag = avio_rl32(pb);
114 codec->codec_id = ff_codec_get_id(ff_codec_aiff_tags, codec->codec_tag);
116 switch (codec->codec_id) {
117 case CODEC_ID_PCM_S16BE:
118 codec->codec_id = aiff_codec_get_id(codec->bits_per_coded_sample);
119 codec->bits_per_coded_sample = av_get_bits_per_sample(codec->codec_id);
121 case CODEC_ID_ADPCM_IMA_QT:
122 codec->block_align = 34*codec->channels;
123 codec->frame_size = 64;
126 codec->block_align = 2*codec->channels;
127 codec->frame_size = 6;
130 codec->block_align = 1*codec->channels;
131 codec->frame_size = 6;
134 codec->block_align = 33;
135 codec->frame_size = 160;
138 codec->block_align = 35;
139 codec->frame_size= 160;
146 /* Need the codec type */
147 codec->codec_id = aiff_codec_get_id(codec->bits_per_coded_sample);
148 codec->bits_per_coded_sample = av_get_bits_per_sample(codec->codec_id);
151 /* Block align needs to be computed in all cases, as the definition
152 * is specific to applications -> here we use the WAVE format definition */
153 if (!codec->block_align)
154 codec->block_align = (codec->bits_per_coded_sample * codec->channels) >> 3;
156 codec->bit_rate = (codec->frame_size ? codec->sample_rate/codec->frame_size :
157 codec->sample_rate) * (codec->block_align << 3);
166 static int aiff_probe(AVProbeData *p)
168 /* check file header */
169 if (p->buf[0] == 'F' && p->buf[1] == 'O' &&
170 p->buf[2] == 'R' && p->buf[3] == 'M' &&
171 p->buf[8] == 'A' && p->buf[9] == 'I' &&
172 p->buf[10] == 'F' && (p->buf[11] == 'F' || p->buf[11] == 'C'))
173 return AVPROBE_SCORE_MAX;
179 static int aiff_read_header(AVFormatContext *s)
184 unsigned version = AIFF_C_VERSION1;
185 AVIOContext *pb = s->pb;
187 AIFFInputContext *aiff = s->priv_data;
189 /* check FORM header */
190 filesize = get_tag(pb, &tag);
191 if (filesize < 0 || tag != MKTAG('F', 'O', 'R', 'M'))
192 return AVERROR_INVALIDDATA;
196 if (tag == MKTAG('A', 'I', 'F', 'F')) /* Got an AIFF file */
198 else if (tag != MKTAG('A', 'I', 'F', 'C')) /* An AIFF-C file then */
199 return AVERROR_INVALIDDATA;
203 st = avformat_new_stream(s, NULL);
205 return AVERROR(ENOMEM);
207 while (filesize > 0) {
208 /* parse different chunks */
209 size = get_tag(pb, &tag);
213 filesize -= size + 8;
216 case MKTAG('C', 'O', 'M', 'M'): /* Common chunk */
217 /* Then for the complete header info */
218 st->nb_frames = get_aiff_header(pb, st->codec, size, version);
219 if (st->nb_frames < 0)
220 return st->nb_frames;
221 if (offset > 0) // COMM is after SSND
224 case MKTAG('F', 'V', 'E', 'R'): /* Version chunk */
225 version = avio_rb32(pb);
227 case MKTAG('N', 'A', 'M', 'E'): /* Sample name chunk */
228 get_meta(s, "title" , size);
230 case MKTAG('A', 'U', 'T', 'H'): /* Author chunk */
231 get_meta(s, "author" , size);
233 case MKTAG('(', 'c', ')', ' '): /* Copyright chunk */
234 get_meta(s, "copyright", size);
236 case MKTAG('A', 'N', 'N', 'O'): /* Annotation chunk */
237 get_meta(s, "comment" , size);
239 case MKTAG('S', 'S', 'N', 'D'): /* Sampled sound chunk */
240 aiff->data_end = avio_tell(pb) + size;
241 offset = avio_rb32(pb); /* Offset of sound data */
242 avio_rb32(pb); /* BlockSize... don't care */
243 offset += avio_tell(pb); /* Compute absolute data offset */
244 if (st->codec->block_align) /* Assume COMM already parsed */
247 av_log(s, AV_LOG_ERROR, "file is not seekable\n");
250 avio_skip(pb, size - 8);
252 case MKTAG('w', 'a', 'v', 'e'):
253 if ((uint64_t)size > (1<<30))
255 st->codec->extradata = av_mallocz(size + FF_INPUT_BUFFER_PADDING_SIZE);
256 if (!st->codec->extradata)
257 return AVERROR(ENOMEM);
258 st->codec->extradata_size = size;
259 avio_read(pb, st->codec->extradata, size);
261 case MKTAG('C','H','A','N'):
263 return AVERROR_INVALIDDATA;
264 ff_mov_read_chan(s, size, st->codec);
267 if (size & 1) /* Always even aligned */
273 if (!st->codec->block_align) {
274 av_log(s, AV_LOG_ERROR, "could not find COMM tag\n");
279 /* Now positioned, get the sound data start and end */
280 avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
282 st->duration = st->codec->frame_size ?
283 st->nb_frames * st->codec->frame_size : st->nb_frames;
285 /* Position the stream at the first block */
286 avio_seek(pb, offset, SEEK_SET);
291 #define MAX_SIZE 4096
293 static int aiff_read_packet(AVFormatContext *s,
296 AVStream *st = s->streams[0];
297 AIFFInputContext *aiff = s->priv_data;
301 /* calculate size of remaining data */
302 max_size = aiff->data_end - avio_tell(s->pb);
306 /* Now for that packet */
307 if (st->codec->block_align >= 33) // GSM, QCLP, IMA4
308 size = st->codec->block_align;
310 size = (MAX_SIZE / st->codec->block_align) * st->codec->block_align;
311 size = FFMIN(max_size, size);
312 res = av_get_packet(s->pb, pkt, size);
316 /* Only one stream in an AIFF file */
317 pkt->stream_index = 0;
321 AVInputFormat ff_aiff_demuxer = {
323 .long_name = NULL_IF_CONFIG_SMALL("Audio IFF"),
324 .priv_data_size = sizeof(AIFFInputContext),
325 .read_probe = aiff_probe,
326 .read_header = aiff_read_header,
327 .read_packet = aiff_read_packet,
328 .read_seek = pcm_read_seek,
329 .codec_tag= (const AVCodecTag* const []){ff_codec_aiff_tags, 0},