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"
25 #include "avio_internal.h"
33 static int aiff_write_header(AVFormatContext *s)
35 AIFFOutputContext *aiff = s->priv_data;
36 AVIOContext *pb = s->pb;
37 AVCodecContext *enc = s->streams[0]->codec;
38 AVExtFloat sample_rate;
41 /* First verify if format is ok */
44 if (enc->codec_tag != MKTAG('N','O','N','E'))
47 /* FORM AIFF header */
48 ffio_wfourcc(pb, "FORM");
49 aiff->form = avio_tell(pb);
50 avio_wb32(pb, 0); /* file length */
51 ffio_wfourcc(pb, aifc ? "AIFC" : "AIFF");
53 if (aifc) { // compressed audio
54 enc->bits_per_coded_sample = 16;
55 if (!enc->block_align) {
56 av_log(s, AV_LOG_ERROR, "block align not set\n");
60 ffio_wfourcc(pb, "FVER");
62 avio_wb32(pb, 0xA2805140);
66 ffio_wfourcc(pb, "COMM");
67 avio_wb32(pb, aifc ? 24 : 18); /* size */
68 avio_wb16(pb, enc->channels); /* Number of channels */
70 aiff->frames = avio_tell(pb);
71 avio_wb32(pb, 0); /* Number of frames */
73 if (!enc->bits_per_coded_sample)
74 enc->bits_per_coded_sample = av_get_bits_per_sample(enc->codec_id);
75 if (!enc->bits_per_coded_sample) {
76 av_log(s, AV_LOG_ERROR, "could not compute bits per sample\n");
79 if (!enc->block_align)
80 enc->block_align = (enc->bits_per_coded_sample * enc->channels) >> 3;
82 avio_wb16(pb, enc->bits_per_coded_sample); /* Sample size */
84 sample_rate = av_dbl2ext((double)enc->sample_rate);
85 avio_write(pb, (uint8_t*)&sample_rate, sizeof(sample_rate));
88 avio_wl32(pb, enc->codec_tag);
92 /* Sound data chunk */
93 ffio_wfourcc(pb, "SSND");
94 aiff->ssnd = avio_tell(pb); /* Sound chunk size */
95 avio_wb32(pb, 0); /* Sound samples data size */
96 avio_wb32(pb, 0); /* Data offset */
97 avio_wb32(pb, 0); /* Block-size (block align) */
99 av_set_pts_info(s->streams[0], 64, 1, s->streams[0]->codec->sample_rate);
101 /* Data is starting here */
107 static int aiff_write_packet(AVFormatContext *s, AVPacket *pkt)
109 AVIOContext *pb = s->pb;
110 avio_write(pb, pkt->data, pkt->size);
114 static int aiff_write_trailer(AVFormatContext *s)
116 AVIOContext *pb = s->pb;
117 AIFFOutputContext *aiff = s->priv_data;
118 AVCodecContext *enc = s->streams[0]->codec;
120 /* Chunks sizes must be even */
121 int64_t file_size, end_size;
122 end_size = file_size = avio_tell(pb);
128 if (s->pb->seekable) {
130 avio_seek(pb, aiff->form, SEEK_SET);
131 avio_wb32(pb, file_size - aiff->form - 4);
133 /* Number of sample frames */
134 avio_seek(pb, aiff->frames, SEEK_SET);
135 avio_wb32(pb, (file_size-aiff->ssnd-12)/enc->block_align);
137 /* Sound Data chunk size */
138 avio_seek(pb, aiff->ssnd, SEEK_SET);
139 avio_wb32(pb, file_size - aiff->ssnd - 4);
141 /* return to the end */
142 avio_seek(pb, end_size, SEEK_SET);
150 AVOutputFormat ff_aiff_muxer = {
152 .long_name = NULL_IF_CONFIG_SMALL("Audio IFF"),
153 .mime_type = "audio/aiff",
154 .extensions = "aif,aiff,afc,aifc",
155 .priv_data_size = sizeof(AIFFOutputContext),
156 .audio_codec = CODEC_ID_PCM_S16BE,
157 .video_codec = CODEC_ID_NONE,
158 .write_header = aiff_write_header,
159 .write_packet = aiff_write_packet,
160 .write_trailer = aiff_write_trailer,
161 .codec_tag= (const AVCodecTag* const []){ff_codec_aiff_tags, 0},