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/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);
74 int res = avio_read(s->pb, str, size);
81 av_dict_set(&s->metadata, key, str, AV_METADATA_DONT_STRDUP_VAL);
85 avio_skip(s->pb, size);
88 /* Returns the number of sound data frames or negative on error */
89 static unsigned int get_aiff_header(AVIOContext *pb, AVCodecContext *codec,
90 int size, unsigned version)
94 unsigned int num_frames;
98 codec->codec_type = AVMEDIA_TYPE_AUDIO;
99 codec->channels = avio_rb16(pb);
100 num_frames = avio_rb32(pb);
101 codec->bits_per_coded_sample = avio_rb16(pb);
103 avio_read(pb, (uint8_t*)&ext, sizeof(ext));/* Sample rate is in */
104 sample_rate = av_ext2dbl(ext); /* 80 bits BE IEEE extended float */
105 codec->sample_rate = sample_rate;
109 if (version == AIFF_C_VERSION1) {
110 codec->codec_tag = avio_rl32(pb);
111 codec->codec_id = ff_codec_get_id(ff_codec_aiff_tags, codec->codec_tag);
113 switch (codec->codec_id) {
114 case CODEC_ID_PCM_S16BE:
115 codec->codec_id = aiff_codec_get_id(codec->bits_per_coded_sample);
116 codec->bits_per_coded_sample = av_get_bits_per_sample(codec->codec_id);
118 case CODEC_ID_ADPCM_IMA_QT:
119 codec->block_align = 34*codec->channels;
120 codec->frame_size = 64;
123 codec->block_align = 2*codec->channels;
124 codec->frame_size = 6;
127 codec->block_align = 1*codec->channels;
128 codec->frame_size = 6;
131 codec->block_align = 33;
132 codec->frame_size = 160;
135 codec->block_align = 35;
136 codec->frame_size= 160;
143 /* Need the codec type */
144 codec->codec_id = aiff_codec_get_id(codec->bits_per_coded_sample);
145 codec->bits_per_coded_sample = av_get_bits_per_sample(codec->codec_id);
148 /* Block align needs to be computed in all cases, as the definition
149 * is specific to applications -> here we use the WAVE format definition */
150 if (!codec->block_align)
151 codec->block_align = (codec->bits_per_coded_sample * codec->channels) >> 3;
153 codec->bit_rate = (codec->frame_size ? codec->sample_rate/codec->frame_size :
154 codec->sample_rate) * (codec->block_align << 3);
163 static int aiff_probe(AVProbeData *p)
165 /* check file header */
166 if (p->buf[0] == 'F' && p->buf[1] == 'O' &&
167 p->buf[2] == 'R' && p->buf[3] == 'M' &&
168 p->buf[8] == 'A' && p->buf[9] == 'I' &&
169 p->buf[10] == 'F' && (p->buf[11] == 'F' || p->buf[11] == 'C'))
170 return AVPROBE_SCORE_MAX;
176 static int aiff_read_header(AVFormatContext *s,
177 AVFormatParameters *ap)
182 unsigned version = AIFF_C_VERSION1;
183 AVIOContext *pb = s->pb;
185 AIFFInputContext *aiff = s->priv_data;
187 /* check FORM header */
188 filesize = get_tag(pb, &tag);
189 if (filesize < 0 || tag != MKTAG('F', 'O', 'R', 'M'))
190 return AVERROR_INVALIDDATA;
194 if (tag == MKTAG('A', 'I', 'F', 'F')) /* Got an AIFF file */
196 else if (tag != MKTAG('A', 'I', 'F', 'C')) /* An AIFF-C file then */
197 return AVERROR_INVALIDDATA;
201 st = avformat_new_stream(s, NULL);
203 return AVERROR(ENOMEM);
205 while (filesize > 0) {
206 /* parse different chunks */
207 size = get_tag(pb, &tag);
211 filesize -= size + 8;
214 case MKTAG('C', 'O', 'M', 'M'): /* Common chunk */
215 /* Then for the complete header info */
216 st->nb_frames = get_aiff_header(pb, st->codec, size, version);
217 if (st->nb_frames < 0)
218 return st->nb_frames;
219 if (offset > 0) // COMM is after SSND
222 case MKTAG('F', 'V', 'E', 'R'): /* Version chunk */
223 version = avio_rb32(pb);
225 case MKTAG('N', 'A', 'M', 'E'): /* Sample name chunk */
226 get_meta(s, "title" , size);
228 case MKTAG('A', 'U', 'T', 'H'): /* Author chunk */
229 get_meta(s, "author" , size);
231 case MKTAG('(', 'c', ')', ' '): /* Copyright chunk */
232 get_meta(s, "copyright", size);
234 case MKTAG('A', 'N', 'N', 'O'): /* Annotation chunk */
235 get_meta(s, "comment" , size);
237 case MKTAG('S', 'S', 'N', 'D'): /* Sampled sound chunk */
238 aiff->data_end = avio_tell(pb) + size;
239 offset = avio_rb32(pb); /* Offset of sound data */
240 avio_rb32(pb); /* BlockSize... don't care */
241 offset += avio_tell(pb); /* Compute absolute data offset */
242 if (st->codec->block_align) /* Assume COMM already parsed */
245 av_log(s, AV_LOG_ERROR, "file is not seekable\n");
248 avio_skip(pb, size - 8);
250 case MKTAG('w', 'a', 'v', 'e'):
251 if ((uint64_t)size > (1<<30))
253 st->codec->extradata = av_mallocz(size + FF_INPUT_BUFFER_PADDING_SIZE);
254 if (!st->codec->extradata)
255 return AVERROR(ENOMEM);
256 st->codec->extradata_size = size;
257 avio_read(pb, st->codec->extradata, size);
259 case MKTAG('C','H','A','N'):
261 return AVERROR_INVALIDDATA;
262 ff_mov_read_chan(s, size, st->codec);
265 if (size & 1) /* Always even aligned */
271 if (!st->codec->block_align) {
272 av_log(s, AV_LOG_ERROR, "could not find COMM tag\n");
277 /* Now positioned, get the sound data start and end */
278 av_set_pts_info(st, 64, 1, st->codec->sample_rate);
280 st->duration = st->codec->frame_size ?
281 st->nb_frames * st->codec->frame_size : st->nb_frames;
283 /* Position the stream at the first block */
284 avio_seek(pb, offset, SEEK_SET);
289 #define MAX_SIZE 4096
291 static int aiff_read_packet(AVFormatContext *s,
294 AVStream *st = s->streams[0];
295 AIFFInputContext *aiff = s->priv_data;
299 /* calculate size of remaining data */
300 max_size = aiff->data_end - avio_tell(s->pb);
304 /* Now for that packet */
305 if (st->codec->block_align >= 33) // GSM, QCLP, IMA4
306 size = st->codec->block_align;
308 size = (MAX_SIZE / st->codec->block_align) * st->codec->block_align;
309 size = FFMIN(max_size, size);
310 res = av_get_packet(s->pb, pkt, size);
314 /* Only one stream in an AIFF file */
315 pkt->stream_index = 0;
319 AVInputFormat ff_aiff_demuxer = {
321 .long_name = NULL_IF_CONFIG_SMALL("Audio IFF"),
322 .priv_data_size = sizeof(AIFFInputContext),
323 .read_probe = aiff_probe,
324 .read_header = aiff_read_header,
325 .read_packet = aiff_read_packet,
326 .read_seek = pcm_read_seek,
327 .codec_tag= (const AVCodecTag* const []){ff_codec_aiff_tags, 0},