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"
25 #include "avio_internal.h"
34 static int aiff_write_header(AVFormatContext *s)
36 AIFFOutputContext *aiff = s->priv_data;
37 AVIOContext *pb = s->pb;
38 AVCodecContext *enc = s->streams[0]->codec;
39 AVExtFloat sample_rate;
42 /* First verify if format is ok */
45 if (enc->codec_tag != MKTAG('N','O','N','E'))
48 /* FORM AIFF header */
49 ffio_wfourcc(pb, "FORM");
50 aiff->form = avio_tell(pb);
51 avio_wb32(pb, 0); /* file length */
52 ffio_wfourcc(pb, aifc ? "AIFC" : "AIFF");
54 if (aifc) { // compressed audio
55 enc->bits_per_coded_sample = 16;
56 if (!enc->block_align) {
57 av_log(s, AV_LOG_ERROR, "block align not set\n");
61 ffio_wfourcc(pb, "FVER");
63 avio_wb32(pb, 0xA2805140);
66 if (enc->channels > 2 && enc->channel_layout) {
67 ffio_wfourcc(pb, "CHAN");
69 ff_mov_write_chan(pb, enc->channel_layout);
73 ffio_wfourcc(pb, "COMM");
74 avio_wb32(pb, aifc ? 24 : 18); /* size */
75 avio_wb16(pb, enc->channels); /* Number of channels */
77 aiff->frames = avio_tell(pb);
78 avio_wb32(pb, 0); /* Number of frames */
80 if (!enc->bits_per_coded_sample)
81 enc->bits_per_coded_sample = av_get_bits_per_sample(enc->codec_id);
82 if (!enc->bits_per_coded_sample) {
83 av_log(s, AV_LOG_ERROR, "could not compute bits per sample\n");
86 if (!enc->block_align)
87 enc->block_align = (enc->bits_per_coded_sample * enc->channels) >> 3;
89 avio_wb16(pb, enc->bits_per_coded_sample); /* Sample size */
91 sample_rate = av_dbl2ext((double)enc->sample_rate);
92 avio_write(pb, (uint8_t*)&sample_rate, sizeof(sample_rate));
95 avio_wl32(pb, enc->codec_tag);
99 /* Sound data chunk */
100 ffio_wfourcc(pb, "SSND");
101 aiff->ssnd = avio_tell(pb); /* Sound chunk size */
102 avio_wb32(pb, 0); /* Sound samples data size */
103 avio_wb32(pb, 0); /* Data offset */
104 avio_wb32(pb, 0); /* Block-size (block align) */
106 av_set_pts_info(s->streams[0], 64, 1, s->streams[0]->codec->sample_rate);
108 /* Data is starting here */
114 static int aiff_write_packet(AVFormatContext *s, AVPacket *pkt)
116 AVIOContext *pb = s->pb;
117 avio_write(pb, pkt->data, pkt->size);
121 static int aiff_write_trailer(AVFormatContext *s)
123 AVIOContext *pb = s->pb;
124 AIFFOutputContext *aiff = s->priv_data;
125 AVCodecContext *enc = s->streams[0]->codec;
127 /* Chunks sizes must be even */
128 int64_t file_size, end_size;
129 end_size = file_size = avio_tell(pb);
135 if (s->pb->seekable) {
137 avio_seek(pb, aiff->form, SEEK_SET);
138 avio_wb32(pb, file_size - aiff->form - 4);
140 /* Number of sample frames */
141 avio_seek(pb, aiff->frames, SEEK_SET);
142 avio_wb32(pb, (file_size-aiff->ssnd-12)/enc->block_align);
144 /* Sound Data chunk size */
145 avio_seek(pb, aiff->ssnd, SEEK_SET);
146 avio_wb32(pb, file_size - aiff->ssnd - 4);
148 /* return to the end */
149 avio_seek(pb, end_size, SEEK_SET);
157 AVOutputFormat ff_aiff_muxer = {
159 .long_name = NULL_IF_CONFIG_SMALL("Audio IFF"),
160 .mime_type = "audio/aiff",
161 .extensions = "aif,aiff,afc,aifc",
162 .priv_data_size = sizeof(AIFFOutputContext),
163 .audio_codec = CODEC_ID_PCM_S16BE,
164 .video_codec = CODEC_ID_NONE,
165 .write_header = aiff_write_header,
166 .write_packet = aiff_write_packet,
167 .write_trailer = aiff_write_trailer,
168 .codec_tag= (const AVCodecTag* const []){ff_codec_aiff_tags, 0},