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/mathematics.h"
23 #include "libavutil/dict.h"
30 #define AIFF_C_VERSION1 0xA2805140
32 typedef struct AIFFInputContext {
37 static enum AVCodecID aiff_codec_get_id(int bps)
40 return AV_CODEC_ID_PCM_S8;
42 return AV_CODEC_ID_PCM_S16BE;
44 return AV_CODEC_ID_PCM_S24BE;
46 return AV_CODEC_ID_PCM_S32BE;
48 /* bigger than 32 isn't allowed */
49 return AV_CODEC_ID_NONE;
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);
76 avio_skip(s->pb, size);
80 res = avio_read(s->pb, str, size);
85 av_dict_set(&s->metadata, key, str, AV_DICT_DONT_STRDUP_VAL);
88 /* Returns the number of sound data frames or negative on error */
89 static unsigned int get_aiff_header(AVFormatContext *s, int size,
92 AVIOContext *pb = s->pb;
93 AVCodecParameters *par = s->streams[0]->codecpar;
94 AIFFInputContext *aiff = s->priv_data;
98 unsigned int num_frames;
102 par->codec_type = AVMEDIA_TYPE_AUDIO;
103 par->channels = avio_rb16(pb);
104 num_frames = avio_rb32(pb);
105 par->bits_per_coded_sample = avio_rb16(pb);
109 sample_rate = ldexp(val, exp - 16383 - 63);
110 par->sample_rate = sample_rate;
113 /* get codec id for AIFF-C */
114 if (version == AIFF_C_VERSION1) {
115 par->codec_tag = avio_rl32(pb);
116 par->codec_id = ff_codec_get_id(ff_codec_aiff_tags, par->codec_tag);
120 if (version != AIFF_C_VERSION1 || par->codec_id == AV_CODEC_ID_PCM_S16BE) {
121 par->codec_id = aiff_codec_get_id(par->bits_per_coded_sample);
122 par->bits_per_coded_sample = av_get_bits_per_sample(par->codec_id);
123 aiff->block_duration = 1;
125 switch (par->codec_id) {
126 case AV_CODEC_ID_PCM_F32BE:
127 case AV_CODEC_ID_PCM_F64BE:
128 case AV_CODEC_ID_PCM_S16LE:
129 case AV_CODEC_ID_PCM_ALAW:
130 case AV_CODEC_ID_PCM_MULAW:
131 aiff->block_duration = 1;
133 case AV_CODEC_ID_ADPCM_IMA_QT:
134 par->block_align = 34 * par->channels;
136 case AV_CODEC_ID_MACE3:
137 par->block_align = 2 * par->channels;
139 case AV_CODEC_ID_ADPCM_G722:
140 case AV_CODEC_ID_MACE6:
141 par->block_align = 1 * par->channels;
143 case AV_CODEC_ID_GSM:
144 par->block_align = 33;
146 case AV_CODEC_ID_QCELP:
147 par->block_align = 35;
152 if (par->block_align > 0)
153 aiff->block_duration = av_get_audio_frame_duration2(par,
157 /* Block align needs to be computed in all cases, as the definition
158 * is specific to applications -> here we use the WAVE format definition */
159 if (!par->block_align)
160 par->block_align = (par->bits_per_coded_sample * par->channels) >> 3;
162 if (aiff->block_duration) {
163 par->bit_rate = par->sample_rate * (par->block_align << 3) /
164 aiff->block_duration;
174 static int aiff_probe(AVProbeData *p)
176 /* check file header */
177 if (p->buf[0] == 'F' && p->buf[1] == 'O' &&
178 p->buf[2] == 'R' && p->buf[3] == 'M' &&
179 p->buf[8] == 'A' && p->buf[9] == 'I' &&
180 p->buf[10] == 'F' && (p->buf[11] == 'F' || p->buf[11] == 'C'))
181 return AVPROBE_SCORE_MAX;
187 static int aiff_read_header(AVFormatContext *s)
192 unsigned version = AIFF_C_VERSION1;
193 AVIOContext *pb = s->pb;
195 AIFFInputContext *aiff = s->priv_data;
197 /* check FORM header */
198 filesize = get_tag(pb, &tag);
199 if (filesize < 0 || tag != MKTAG('F', 'O', 'R', 'M'))
200 return AVERROR_INVALIDDATA;
204 if (tag == MKTAG('A', 'I', 'F', 'F')) /* Got an AIFF file */
206 else if (tag != MKTAG('A', 'I', 'F', 'C')) /* An AIFF-C file then */
207 return AVERROR_INVALIDDATA;
211 st = avformat_new_stream(s, NULL);
213 return AVERROR(ENOMEM);
215 while (filesize > 0) {
216 /* parse different chunks */
217 size = get_tag(pb, &tag);
221 filesize -= size + 8;
224 case MKTAG('C', 'O', 'M', 'M'): /* Common chunk */
225 /* Then for the complete header info */
226 st->nb_frames = get_aiff_header(s, size, version);
227 if (st->nb_frames < 0)
228 return st->nb_frames;
229 if (offset > 0) // COMM is after SSND
232 case MKTAG('F', 'V', 'E', 'R'): /* Version chunk */
233 version = avio_rb32(pb);
235 case MKTAG('N', 'A', 'M', 'E'): /* Sample name chunk */
236 get_meta(s, "title" , size);
238 case MKTAG('A', 'U', 'T', 'H'): /* Author chunk */
239 get_meta(s, "author" , size);
241 case MKTAG('(', 'c', ')', ' '): /* Copyright chunk */
242 get_meta(s, "copyright", size);
244 case MKTAG('A', 'N', 'N', 'O'): /* Annotation chunk */
245 get_meta(s, "comment" , size);
247 case MKTAG('S', 'S', 'N', 'D'): /* Sampled sound chunk */
248 aiff->data_end = avio_tell(pb) + size;
249 offset = avio_rb32(pb); /* Offset of sound data */
250 avio_rb32(pb); /* BlockSize... don't care */
251 offset += avio_tell(pb); /* Compute absolute data offset */
252 if (st->codecpar->block_align) /* Assume COMM already parsed */
255 av_log(s, AV_LOG_ERROR, "file is not seekable\n");
258 avio_skip(pb, size - 8);
260 case MKTAG('w', 'a', 'v', 'e'):
261 if ((uint64_t)size > (1<<30))
263 st->codecpar->extradata = av_mallocz(size + AV_INPUT_BUFFER_PADDING_SIZE);
264 if (!st->codecpar->extradata)
265 return AVERROR(ENOMEM);
266 st->codecpar->extradata_size = size;
267 avio_read(pb, st->codecpar->extradata, size);
270 if (size & 1) /* Always even aligned */
277 if (!st->codecpar->block_align) {
278 av_log(s, AV_LOG_ERROR, "could not find COMM tag or invalid block_align value\n");
282 /* Now positioned, get the sound data start and end */
283 avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
285 st->duration = st->nb_frames * aiff->block_duration;
287 /* Position the stream at the first block */
288 avio_seek(pb, offset, SEEK_SET);
293 #define MAX_SIZE 4096
295 static int aiff_read_packet(AVFormatContext *s,
298 AVStream *st = s->streams[0];
299 AIFFInputContext *aiff = s->priv_data;
303 /* calculate size of remaining data */
304 max_size = aiff->data_end - avio_tell(s->pb);
308 /* Now for that packet */
309 if (st->codecpar->block_align >= 33) // GSM, QCLP, IMA4
310 size = st->codecpar->block_align;
312 size = (MAX_SIZE / st->codecpar->block_align) * st->codecpar->block_align;
313 size = FFMIN(max_size, size);
314 res = av_get_packet(s->pb, pkt, size);
318 /* Only one stream in an AIFF file */
319 pkt->stream_index = 0;
320 pkt->duration = (res / st->codecpar->block_align) * aiff->block_duration;
324 AVInputFormat ff_aiff_demuxer = {
326 .long_name = NULL_IF_CONFIG_SMALL("Audio IFF"),
327 .priv_data_size = sizeof(AIFFInputContext),
328 .read_probe = aiff_probe,
329 .read_header = aiff_read_header,
330 .read_packet = aiff_read_packet,
331 .read_seek = ff_pcm_read_seek,
332 .codec_tag = (const AVCodecTag* const []){ ff_codec_aiff_tags, 0 },