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.h"
26 #include "avio_internal.h"
35 static int aiff_write_header(AVFormatContext *s)
37 AIFFOutputContext *aiff = s->priv_data;
38 AVIOContext *pb = s->pb;
39 AVCodecContext *enc = s->streams[0]->codec;
43 /* First verify if format is ok */
46 if (enc->codec_tag != MKTAG('N','O','N','E'))
49 /* FORM AIFF header */
50 ffio_wfourcc(pb, "FORM");
51 aiff->form = avio_tell(pb);
52 avio_wb32(pb, 0); /* file length */
53 ffio_wfourcc(pb, aifc ? "AIFC" : "AIFF");
55 if (aifc) { // compressed audio
56 enc->bits_per_coded_sample = 16;
57 if (!enc->block_align) {
58 av_log(s, AV_LOG_ERROR, "block align not set\n");
62 ffio_wfourcc(pb, "FVER");
64 avio_wb32(pb, 0xA2805140);
67 if (enc->channels > 2 && enc->channel_layout) {
68 ffio_wfourcc(pb, "CHAN");
70 ff_mov_write_chan(pb, enc->channel_layout);
74 ffio_wfourcc(pb, "COMM");
75 avio_wb32(pb, aifc ? 24 : 18); /* size */
76 avio_wb16(pb, enc->channels); /* Number of channels */
78 aiff->frames = avio_tell(pb);
79 avio_wb32(pb, 0); /* Number of frames */
81 if (!enc->bits_per_coded_sample)
82 enc->bits_per_coded_sample = av_get_bits_per_sample(enc->codec_id);
83 if (!enc->bits_per_coded_sample) {
84 av_log(s, AV_LOG_ERROR, "could not compute bits per sample\n");
87 if (!enc->block_align)
88 enc->block_align = (enc->bits_per_coded_sample * enc->channels) >> 3;
90 avio_wb16(pb, enc->bits_per_coded_sample); /* Sample size */
92 sample_rate = av_double2int(enc->sample_rate);
93 avio_wb16(pb, (sample_rate >> 52) + (16383 - 1023));
94 avio_wb64(pb, UINT64_C(1) << 63 | sample_rate << 11);
97 avio_wl32(pb, enc->codec_tag);
101 if (enc->codec_tag == MKTAG('Q','D','M','2') && enc->extradata_size) {
102 ffio_wfourcc(pb, "wave");
103 avio_wb32(pb, enc->extradata_size);
104 avio_write(pb, enc->extradata, enc->extradata_size);
107 /* Sound data chunk */
108 ffio_wfourcc(pb, "SSND");
109 aiff->ssnd = avio_tell(pb); /* Sound chunk size */
110 avio_wb32(pb, 0); /* Sound samples data size */
111 avio_wb32(pb, 0); /* Data offset */
112 avio_wb32(pb, 0); /* Block-size (block align) */
114 avpriv_set_pts_info(s->streams[0], 64, 1, s->streams[0]->codec->sample_rate);
116 /* Data is starting here */
122 static int aiff_write_packet(AVFormatContext *s, AVPacket *pkt)
124 AVIOContext *pb = s->pb;
125 avio_write(pb, pkt->data, pkt->size);
129 static int aiff_write_trailer(AVFormatContext *s)
131 AVIOContext *pb = s->pb;
132 AIFFOutputContext *aiff = s->priv_data;
133 AVCodecContext *enc = s->streams[0]->codec;
135 /* Chunks sizes must be even */
136 int64_t file_size, end_size;
137 end_size = file_size = avio_tell(pb);
143 if (s->pb->seekable) {
145 avio_seek(pb, aiff->form, SEEK_SET);
146 avio_wb32(pb, file_size - aiff->form - 4);
148 /* Number of sample frames */
149 avio_seek(pb, aiff->frames, SEEK_SET);
150 avio_wb32(pb, (file_size-aiff->ssnd-12)/enc->block_align);
152 /* Sound Data chunk size */
153 avio_seek(pb, aiff->ssnd, SEEK_SET);
154 avio_wb32(pb, file_size - aiff->ssnd - 4);
156 /* return to the end */
157 avio_seek(pb, end_size, SEEK_SET);
165 AVOutputFormat ff_aiff_muxer = {
167 .long_name = NULL_IF_CONFIG_SMALL("Audio IFF"),
168 .mime_type = "audio/aiff",
169 .extensions = "aif,aiff,afc,aifc",
170 .priv_data_size = sizeof(AIFFOutputContext),
171 .audio_codec = AV_CODEC_ID_PCM_S16BE,
172 .video_codec = AV_CODEC_ID_NONE,
173 .write_header = aiff_write_header,
174 .write_packet = aiff_write_packet,
175 .write_trailer = aiff_write_trailer,
176 .codec_tag = (const AVCodecTag* const []){ ff_codec_aiff_tags, 0 },