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 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_double2int(enc->sample_rate);
92 avio_wb16(pb, (sample_rate >> 52) + (16383 - 1023));
93 avio_wb64(pb, UINT64_C(1) << 63 | sample_rate << 11);
96 avio_wl32(pb, enc->codec_tag);
100 if (enc->codec_tag == MKTAG('Q','D','M','2') && enc->extradata_size) {
101 ffio_wfourcc(pb, "wave");
102 avio_wb32(pb, enc->extradata_size);
103 avio_write(pb, enc->extradata, enc->extradata_size);
106 /* Sound data chunk */
107 ffio_wfourcc(pb, "SSND");
108 aiff->ssnd = avio_tell(pb); /* Sound chunk size */
109 avio_wb32(pb, 0); /* Sound samples data size */
110 avio_wb32(pb, 0); /* Data offset */
111 avio_wb32(pb, 0); /* Block-size (block align) */
113 avpriv_set_pts_info(s->streams[0], 64, 1, s->streams[0]->codec->sample_rate);
115 /* Data is starting here */
121 static int aiff_write_packet(AVFormatContext *s, AVPacket *pkt)
123 AVIOContext *pb = s->pb;
124 avio_write(pb, pkt->data, pkt->size);
128 static int aiff_write_trailer(AVFormatContext *s)
130 AVIOContext *pb = s->pb;
131 AIFFOutputContext *aiff = s->priv_data;
132 AVCodecContext *enc = s->streams[0]->codec;
134 /* Chunks sizes must be even */
135 int64_t file_size, end_size;
136 end_size = file_size = avio_tell(pb);
142 if (s->pb->seekable) {
144 avio_seek(pb, aiff->form, SEEK_SET);
145 avio_wb32(pb, file_size - aiff->form - 4);
147 /* Number of sample frames */
148 avio_seek(pb, aiff->frames, SEEK_SET);
149 avio_wb32(pb, (file_size-aiff->ssnd-12)/enc->block_align);
151 /* Sound Data chunk size */
152 avio_seek(pb, aiff->ssnd, SEEK_SET);
153 avio_wb32(pb, file_size - aiff->ssnd - 4);
155 /* return to the end */
156 avio_seek(pb, end_size, SEEK_SET);
164 AVOutputFormat ff_aiff_muxer = {
166 .long_name = NULL_IF_CONFIG_SMALL("Audio IFF"),
167 .mime_type = "audio/aiff",
168 .extensions = "aif,aiff,afc,aifc",
169 .priv_data_size = sizeof(AIFFOutputContext),
170 .audio_codec = AV_CODEC_ID_PCM_S16BE,
171 .video_codec = AV_CODEC_ID_NONE,
172 .write_header = aiff_write_header,
173 .write_packet = aiff_write_packet,
174 .write_trailer = aiff_write_trailer,
175 .codec_tag = (const AVCodecTag* const []){ ff_codec_aiff_tags, 0 },