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"
33 #define AIFF_C_VERSION1 0xA2805140
40 static enum AVCodecID aiff_codec_get_id(int bps)
43 return AV_CODEC_ID_PCM_S8;
45 return AV_CODEC_ID_PCM_S16BE;
47 return AV_CODEC_ID_PCM_S24BE;
49 return AV_CODEC_ID_PCM_S32BE;
51 /* bigger than 32 isn't allowed */
52 return AV_CODEC_ID_NONE;
55 /* returns the size of the found tag */
56 static int get_tag(AVIOContext *pb, uint32_t * tag)
72 /* Metadata string read */
73 static void get_meta(AVFormatContext *s, const char *key, int size)
75 uint8_t *str = av_malloc(size+1);
78 int res = avio_read(s->pb, str, size);
85 av_dict_set(&s->metadata, key, str, AV_DICT_DONT_STRDUP_VAL);
89 avio_skip(s->pb, size);
92 /* Returns the number of sound data frames or negative on error */
93 static unsigned int get_aiff_header(AVFormatContext *s, int size,
96 AVIOContext *pb = s->pb;
97 AVCodecContext *codec = s->streams[0]->codec;
98 AIFFInputContext *aiff = s->priv_data;
102 unsigned int num_frames;
106 codec->codec_type = AVMEDIA_TYPE_AUDIO;
107 codec->channels = avio_rb16(pb);
108 num_frames = avio_rb32(pb);
109 codec->bits_per_coded_sample = avio_rb16(pb);
113 sample_rate = ldexp(val, exp - 16383 - 63);
114 codec->sample_rate = sample_rate;
117 /* get codec id for AIFF-C */
118 if (version == AIFF_C_VERSION1) {
119 codec->codec_tag = avio_rl32(pb);
120 codec->codec_id = ff_codec_get_id(ff_codec_aiff_tags, codec->codec_tag);
124 if (version != AIFF_C_VERSION1 || codec->codec_id == AV_CODEC_ID_PCM_S16BE) {
125 codec->codec_id = aiff_codec_get_id(codec->bits_per_coded_sample);
126 codec->bits_per_coded_sample = av_get_bits_per_sample(codec->codec_id);
127 aiff->block_duration = 1;
129 switch (codec->codec_id) {
130 case AV_CODEC_ID_PCM_F32BE:
131 case AV_CODEC_ID_PCM_F64BE:
132 case AV_CODEC_ID_PCM_S16LE:
133 case AV_CODEC_ID_PCM_ALAW:
134 case AV_CODEC_ID_PCM_MULAW:
135 aiff->block_duration = 1;
137 case AV_CODEC_ID_ADPCM_IMA_QT:
138 codec->block_align = 34*codec->channels;
140 case AV_CODEC_ID_MACE3:
141 codec->block_align = 2*codec->channels;
143 case AV_CODEC_ID_MACE6:
144 codec->block_align = 1*codec->channels;
146 case AV_CODEC_ID_GSM:
147 codec->block_align = 33;
149 case AV_CODEC_ID_QCELP:
150 codec->block_align = 35;
153 aiff->block_duration = 1;
156 if (codec->block_align > 0)
157 aiff->block_duration = av_get_audio_frame_duration(codec,
161 /* Block align needs to be computed in all cases, as the definition
162 * is specific to applications -> here we use the WAVE format definition */
163 if (!codec->block_align)
164 codec->block_align = (av_get_bits_per_sample(codec->codec_id) * codec->channels) >> 3;
166 if (aiff->block_duration) {
167 codec->bit_rate = codec->sample_rate * (codec->block_align << 3) /
168 aiff->block_duration;
178 static int aiff_probe(AVProbeData *p)
180 /* check file header */
181 if (p->buf[0] == 'F' && p->buf[1] == 'O' &&
182 p->buf[2] == 'R' && p->buf[3] == 'M' &&
183 p->buf[8] == 'A' && p->buf[9] == 'I' &&
184 p->buf[10] == 'F' && (p->buf[11] == 'F' || p->buf[11] == 'C'))
185 return AVPROBE_SCORE_MAX;
191 static int aiff_read_header(AVFormatContext *s)
196 unsigned version = AIFF_C_VERSION1;
197 AVIOContext *pb = s->pb;
199 AIFFInputContext *aiff = s->priv_data;
200 ID3v2ExtraMeta *id3v2_extra_meta = NULL;
202 /* check FORM header */
203 filesize = get_tag(pb, &tag);
204 if (filesize < 0 || tag != MKTAG('F', 'O', 'R', 'M'))
205 return AVERROR_INVALIDDATA;
209 if (tag == MKTAG('A', 'I', 'F', 'F')) /* Got an AIFF file */
211 else if (tag != MKTAG('A', 'I', 'F', 'C')) /* An AIFF-C file then */
212 return AVERROR_INVALIDDATA;
216 st = avformat_new_stream(s, NULL);
218 return AVERROR(ENOMEM);
220 while (filesize > 0) {
221 /* parse different chunks */
222 size = get_tag(pb, &tag);
226 filesize -= size + 8;
229 case MKTAG('C', 'O', 'M', 'M'): /* Common chunk */
230 /* Then for the complete header info */
231 st->nb_frames = get_aiff_header(s, size, version);
232 if (st->nb_frames < 0)
233 return st->nb_frames;
234 if (offset > 0) // COMM is after SSND
237 case MKTAG('I', 'D', '3', ' '):
238 ff_id3v2_read(s, ID3v2_DEFAULT_MAGIC, &id3v2_extra_meta);
239 ff_id3v2_free_extra_meta(&id3v2_extra_meta);
241 case MKTAG('F', 'V', 'E', 'R'): /* Version chunk */
242 version = avio_rb32(pb);
244 case MKTAG('N', 'A', 'M', 'E'): /* Sample name chunk */
245 get_meta(s, "title" , size);
247 case MKTAG('A', 'U', 'T', 'H'): /* Author chunk */
248 get_meta(s, "author" , size);
250 case MKTAG('(', 'c', ')', ' '): /* Copyright chunk */
251 get_meta(s, "copyright", size);
253 case MKTAG('A', 'N', 'N', 'O'): /* Annotation chunk */
254 get_meta(s, "comment" , size);
256 case MKTAG('S', 'S', 'N', 'D'): /* Sampled sound chunk */
257 aiff->data_end = avio_tell(pb) + size;
258 offset = avio_rb32(pb); /* Offset of sound data */
259 avio_rb32(pb); /* BlockSize... don't care */
260 offset += avio_tell(pb); /* Compute absolute data offset */
261 if (st->codec->block_align) /* Assume COMM already parsed */
264 av_log(s, AV_LOG_ERROR, "file is not seekable\n");
267 avio_skip(pb, size - 8);
269 case MKTAG('w', 'a', 'v', 'e'):
270 if ((uint64_t)size > (1<<30))
272 st->codec->extradata = av_mallocz(size + FF_INPUT_BUFFER_PADDING_SIZE);
273 if (!st->codec->extradata)
274 return AVERROR(ENOMEM);
275 st->codec->extradata_size = size;
276 avio_read(pb, st->codec->extradata, size);
277 if (st->codec->codec_id == AV_CODEC_ID_QDM2 && size>=12*4 && !st->codec->block_align)
278 st->codec->block_align = AV_RB32(st->codec->extradata+11*4);
280 case MKTAG('C','H','A','N'):
281 if(ff_mov_read_chan(s, pb, st, size) < 0)
282 return AVERROR_INVALIDDATA;
285 if (size & 1) /* Always even aligned */
292 if (!st->codec->block_align) {
293 av_log(s, AV_LOG_ERROR, "could not find COMM tag or invalid block_align value\n");
297 /* Now positioned, get the sound data start and end */
298 avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
300 st->duration = st->nb_frames * aiff->block_duration;
302 /* Position the stream at the first block */
303 avio_seek(pb, offset, SEEK_SET);
308 #define MAX_SIZE 4096
310 static int aiff_read_packet(AVFormatContext *s,
313 AVStream *st = s->streams[0];
314 AIFFInputContext *aiff = s->priv_data;
318 /* calculate size of remaining data */
319 max_size = aiff->data_end - avio_tell(s->pb);
323 /* Now for that packet */
324 if (st->codec->block_align >= 33) // GSM, QCLP, IMA4
325 size = st->codec->block_align;
327 size = (MAX_SIZE / st->codec->block_align) * st->codec->block_align;
328 size = FFMIN(max_size, size);
329 res = av_get_packet(s->pb, pkt, size);
333 if (size >= st->codec->block_align)
334 pkt->flags &= ~AV_PKT_FLAG_CORRUPT;
335 /* Only one stream in an AIFF file */
336 pkt->stream_index = 0;
337 pkt->duration = (res / st->codec->block_align) * aiff->block_duration;
341 AVInputFormat ff_aiff_demuxer = {
343 .long_name = NULL_IF_CONFIG_SMALL("Audio IFF"),
344 .priv_data_size = sizeof(AIFFInputContext),
345 .read_probe = aiff_probe,
346 .read_header = aiff_read_header,
347 .read_packet = aiff_read_packet,
348 .read_seek = ff_pcm_read_seek,
349 .codec_tag = (const AVCodecTag* const []){ ff_codec_aiff_tags, 0 },