3 * Copyright (c) 2006 Patrick Guimond
5 * This file is part of Libav.
7 * Libav 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 * Libav 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 Libav; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 #include "libavutil/intfloat_readwrite.h"
23 #include "libavutil/dict.h"
30 #define AIFF_C_VERSION1 0xA2805140
36 static enum CodecID aiff_codec_get_id(int bps)
39 return CODEC_ID_PCM_S8;
41 return CODEC_ID_PCM_S16BE;
43 return CODEC_ID_PCM_S24BE;
45 return CODEC_ID_PCM_S32BE;
47 /* bigger than 32 isn't allowed */
51 /* returns the size of the found tag */
52 static int get_tag(AVIOContext *pb, uint32_t * tag)
68 /* Metadata string read */
69 static void get_meta(AVFormatContext *s, const char *key, int size)
71 uint8_t *str = av_malloc(size+1);
75 avio_skip(s->pb, size);
79 res = avio_read(s->pb, str, size);
84 av_dict_set(&s->metadata, key, str, AV_DICT_DONT_STRDUP_VAL);
87 /* Returns the number of sound data frames or negative on error */
88 static unsigned int get_aiff_header(AVIOContext *pb, AVCodecContext *codec,
89 int size, unsigned version)
93 unsigned int num_frames;
97 codec->codec_type = AVMEDIA_TYPE_AUDIO;
98 codec->channels = avio_rb16(pb);
99 num_frames = avio_rb32(pb);
100 codec->bits_per_coded_sample = avio_rb16(pb);
102 avio_read(pb, (uint8_t*)&ext, sizeof(ext));/* Sample rate is in */
103 sample_rate = av_ext2dbl(ext); /* 80 bits BE IEEE extended float */
104 codec->sample_rate = sample_rate;
108 if (version == AIFF_C_VERSION1) {
109 codec->codec_tag = avio_rl32(pb);
110 codec->codec_id = ff_codec_get_id(ff_codec_aiff_tags, codec->codec_tag);
112 switch (codec->codec_id) {
113 case CODEC_ID_PCM_S16BE:
114 codec->codec_id = aiff_codec_get_id(codec->bits_per_coded_sample);
115 codec->bits_per_coded_sample = av_get_bits_per_sample(codec->codec_id);
117 case CODEC_ID_ADPCM_IMA_QT:
118 codec->block_align = 34*codec->channels;
119 codec->frame_size = 64;
122 codec->block_align = 2*codec->channels;
123 codec->frame_size = 6;
126 codec->block_align = 1*codec->channels;
127 codec->frame_size = 6;
130 codec->block_align = 33;
131 codec->frame_size = 160;
134 codec->block_align = 35;
135 codec->frame_size= 160;
142 /* Need the codec type */
143 codec->codec_id = aiff_codec_get_id(codec->bits_per_coded_sample);
144 codec->bits_per_coded_sample = av_get_bits_per_sample(codec->codec_id);
147 /* Block align needs to be computed in all cases, as the definition
148 * is specific to applications -> here we use the WAVE format definition */
149 if (!codec->block_align)
150 codec->block_align = (codec->bits_per_coded_sample * codec->channels) >> 3;
152 codec->bit_rate = (codec->frame_size ? codec->sample_rate/codec->frame_size :
153 codec->sample_rate) * (codec->block_align << 3);
162 static int aiff_probe(AVProbeData *p)
164 /* check file header */
165 if (p->buf[0] == 'F' && p->buf[1] == 'O' &&
166 p->buf[2] == 'R' && p->buf[3] == 'M' &&
167 p->buf[8] == 'A' && p->buf[9] == 'I' &&
168 p->buf[10] == 'F' && (p->buf[11] == 'F' || p->buf[11] == 'C'))
169 return AVPROBE_SCORE_MAX;
175 static int aiff_read_header(AVFormatContext *s,
176 AVFormatParameters *ap)
181 unsigned version = AIFF_C_VERSION1;
182 AVIOContext *pb = s->pb;
184 AIFFInputContext *aiff = s->priv_data;
186 /* check FORM header */
187 filesize = get_tag(pb, &tag);
188 if (filesize < 0 || tag != MKTAG('F', 'O', 'R', 'M'))
189 return AVERROR_INVALIDDATA;
193 if (tag == MKTAG('A', 'I', 'F', 'F')) /* Got an AIFF file */
195 else if (tag != MKTAG('A', 'I', 'F', 'C')) /* An AIFF-C file then */
196 return AVERROR_INVALIDDATA;
200 st = avformat_new_stream(s, NULL);
202 return AVERROR(ENOMEM);
204 while (filesize > 0) {
205 /* parse different chunks */
206 size = get_tag(pb, &tag);
210 filesize -= size + 8;
213 case MKTAG('C', 'O', 'M', 'M'): /* Common chunk */
214 /* Then for the complete header info */
215 st->nb_frames = get_aiff_header(pb, st->codec, size, version);
216 if (st->nb_frames < 0)
217 return st->nb_frames;
218 if (offset > 0) // COMM is after SSND
221 case MKTAG('F', 'V', 'E', 'R'): /* Version chunk */
222 version = avio_rb32(pb);
224 case MKTAG('N', 'A', 'M', 'E'): /* Sample name chunk */
225 get_meta(s, "title" , size);
227 case MKTAG('A', 'U', 'T', 'H'): /* Author chunk */
228 get_meta(s, "author" , size);
230 case MKTAG('(', 'c', ')', ' '): /* Copyright chunk */
231 get_meta(s, "copyright", size);
233 case MKTAG('A', 'N', 'N', 'O'): /* Annotation chunk */
234 get_meta(s, "comment" , size);
236 case MKTAG('S', 'S', 'N', 'D'): /* Sampled sound chunk */
237 aiff->data_end = avio_tell(pb) + size;
238 offset = avio_rb32(pb); /* Offset of sound data */
239 avio_rb32(pb); /* BlockSize... don't care */
240 offset += avio_tell(pb); /* Compute absolute data offset */
241 if (st->codec->block_align) /* Assume COMM already parsed */
244 av_log(s, AV_LOG_ERROR, "file is not seekable\n");
247 avio_skip(pb, size - 8);
249 case MKTAG('w', 'a', 'v', 'e'):
250 if ((uint64_t)size > (1<<30))
252 st->codec->extradata = av_mallocz(size + FF_INPUT_BUFFER_PADDING_SIZE);
253 if (!st->codec->extradata)
254 return AVERROR(ENOMEM);
255 st->codec->extradata_size = size;
256 avio_read(pb, st->codec->extradata, size);
259 if (size & 1) /* Always even aligned */
265 if (!st->codec->block_align) {
266 av_log(s, AV_LOG_ERROR, "could not find COMM tag\n");
271 /* Now positioned, get the sound data start and end */
272 avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
274 st->duration = st->codec->frame_size ?
275 st->nb_frames * st->codec->frame_size : st->nb_frames;
277 /* Position the stream at the first block */
278 avio_seek(pb, offset, SEEK_SET);
283 #define MAX_SIZE 4096
285 static int aiff_read_packet(AVFormatContext *s,
288 AVStream *st = s->streams[0];
289 AIFFInputContext *aiff = s->priv_data;
293 /* calculate size of remaining data */
294 max_size = aiff->data_end - avio_tell(s->pb);
298 /* Now for that packet */
299 if (st->codec->block_align >= 33) // GSM, QCLP, IMA4
300 size = st->codec->block_align;
302 size = (MAX_SIZE / st->codec->block_align) * st->codec->block_align;
303 size = FFMIN(max_size, size);
304 res = av_get_packet(s->pb, pkt, size);
308 /* Only one stream in an AIFF file */
309 pkt->stream_index = 0;
313 AVInputFormat ff_aiff_demuxer = {
315 .long_name = NULL_IF_CONFIG_SMALL("Audio IFF"),
316 .priv_data_size = sizeof(AIFFInputContext),
317 .read_probe = aiff_probe,
318 .read_header = aiff_read_header,
319 .read_packet = aiff_read_packet,
320 .read_seek = pcm_read_seek,
321 .codec_tag= (const AVCodecTag* const []){ff_codec_aiff_tags, 0},