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
31 static int aiff_write_header(AVFormatContext
*s
)
33 AIFFOutputContext
*aiff
= s
->priv_data
;
34 ByteIOContext
*pb
= s
->pb
;
35 AVCodecContext
*enc
= s
->streams
[0]->codec
;
36 AVExtFloat sample_rate
;
39 /* First verify if format is ok */
42 if (enc
->codec_tag
!= MKTAG('N','O','N','E'))
45 /* FORM AIFF header */
47 aiff
->form
= url_ftell(pb
);
48 put_be32(pb
, 0); /* file length */
49 put_tag(pb
, aifc
? "AIFC" : "AIFF");
51 if (aifc
) { // compressed audio
52 enc
->bits_per_coded_sample
= 16;
53 if (!enc
->block_align
) {
54 av_log(s
, AV_LOG_ERROR
, "block align not set\n");
60 put_be32(pb
, 0xA2805140);
65 put_be32(pb
, aifc
? 24 : 18); /* size */
66 put_be16(pb
, enc
->channels
); /* Number of channels */
68 aiff
->frames
= url_ftell(pb
);
69 put_be32(pb
, 0); /* Number of frames */
71 if (!enc
->bits_per_coded_sample
)
72 enc
->bits_per_coded_sample
= av_get_bits_per_sample(enc
->codec_id
);
73 if (!enc
->bits_per_coded_sample
) {
74 av_log(s
, AV_LOG_ERROR
, "could not compute bits per sample\n");
77 if (!enc
->block_align
)
78 enc
->block_align
= (enc
->bits_per_coded_sample
* enc
->channels
) >> 3;
80 put_be16(pb
, enc
->bits_per_coded_sample
); /* Sample size */
82 sample_rate
= av_dbl2ext((double)enc
->sample_rate
);
83 put_buffer(pb
, (uint8_t*)&sample_rate
, sizeof(sample_rate
));
86 put_le32(pb
, enc
->codec_tag
);
90 /* Sound data chunk */
92 aiff
->ssnd
= url_ftell(pb
); /* Sound chunk size */
93 put_be32(pb
, 0); /* Sound samples data size */
94 put_be32(pb
, 0); /* Data offset */
95 put_be32(pb
, 0); /* Block-size (block align) */
97 av_set_pts_info(s
->streams
[0], 64, 1, s
->streams
[0]->codec
->sample_rate
);
99 /* Data is starting here */
100 put_flush_packet(pb
);
105 static int aiff_write_packet(AVFormatContext
*s
, AVPacket
*pkt
)
107 ByteIOContext
*pb
= s
->pb
;
108 put_buffer(pb
, pkt
->data
, pkt
->size
);
112 static int aiff_write_trailer(AVFormatContext
*s
)
114 ByteIOContext
*pb
= s
->pb
;
115 AIFFOutputContext
*aiff
= s
->priv_data
;
116 AVCodecContext
*enc
= s
->streams
[0]->codec
;
118 /* Chunks sizes must be even */
119 int64_t file_size
, end_size
;
120 end_size
= file_size
= url_ftell(pb
);
126 if (!url_is_streamed(s
->pb
)) {
128 url_fseek(pb
, aiff
->form
, SEEK_SET
);
129 put_be32(pb
, file_size
- aiff
->form
- 4);
131 /* Number of sample frames */
132 url_fseek(pb
, aiff
->frames
, SEEK_SET
);
133 put_be32(pb
, (file_size
-aiff
->ssnd
-12)/enc
->block_align
);
135 /* Sound Data chunk size */
136 url_fseek(pb
, aiff
->ssnd
, SEEK_SET
);
137 put_be32(pb
, file_size
- aiff
->ssnd
- 4);
139 /* return to the end */
140 url_fseek(pb
, end_size
, SEEK_SET
);
142 put_flush_packet(pb
);
148 AVOutputFormat aiff_muxer
= {
150 NULL_IF_CONFIG_SMALL("Audio IFF"),
153 sizeof(AIFFOutputContext
),
159 .codec_tag
= (const AVCodecTag
* const []){ff_codec_aiff_tags
, 0},