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
24 #include "avio_internal.h"
32 static int aiff_write_header(AVFormatContext *s)
34 AIFFOutputContext *aiff = s->priv_data;
35 AVIOContext *pb = s->pb;
36 AVCodecContext *enc = s->streams[0]->codec;
37 AVExtFloat sample_rate;
40 /* First verify if format is ok */
43 if (enc->codec_tag != MKTAG('N','O','N','E'))
46 /* FORM AIFF header */
47 ffio_wfourcc(pb, "FORM");
48 aiff->form = url_ftell(pb);
49 avio_wb32(pb, 0); /* file length */
50 ffio_wfourcc(pb, aifc ? "AIFC" : "AIFF");
52 if (aifc) { // compressed audio
53 enc->bits_per_coded_sample = 16;
54 if (!enc->block_align) {
55 av_log(s, AV_LOG_ERROR, "block align not set\n");
59 ffio_wfourcc(pb, "FVER");
61 avio_wb32(pb, 0xA2805140);
65 ffio_wfourcc(pb, "COMM");
66 avio_wb32(pb, aifc ? 24 : 18); /* size */
67 avio_wb16(pb, enc->channels); /* Number of channels */
69 aiff->frames = url_ftell(pb);
70 avio_wb32(pb, 0); /* Number of frames */
72 if (!enc->bits_per_coded_sample)
73 enc->bits_per_coded_sample = av_get_bits_per_sample(enc->codec_id);
74 if (!enc->bits_per_coded_sample) {
75 av_log(s, AV_LOG_ERROR, "could not compute bits per sample\n");
78 if (!enc->block_align)
79 enc->block_align = (enc->bits_per_coded_sample * enc->channels) >> 3;
81 avio_wb16(pb, enc->bits_per_coded_sample); /* Sample size */
83 sample_rate = av_dbl2ext((double)enc->sample_rate);
84 avio_write(pb, (uint8_t*)&sample_rate, sizeof(sample_rate));
87 avio_wl32(pb, enc->codec_tag);
91 /* Sound data chunk */
92 ffio_wfourcc(pb, "SSND");
93 aiff->ssnd = url_ftell(pb); /* Sound chunk size */
94 avio_wb32(pb, 0); /* Sound samples data size */
95 avio_wb32(pb, 0); /* Data offset */
96 avio_wb32(pb, 0); /* Block-size (block align) */
98 av_set_pts_info(s->streams[0], 64, 1, s->streams[0]->codec->sample_rate);
100 /* Data is starting here */
101 put_flush_packet(pb);
106 static int aiff_write_packet(AVFormatContext *s, AVPacket *pkt)
108 AVIOContext *pb = s->pb;
109 avio_write(pb, pkt->data, pkt->size);
113 static int aiff_write_trailer(AVFormatContext *s)
115 AVIOContext *pb = s->pb;
116 AIFFOutputContext *aiff = s->priv_data;
117 AVCodecContext *enc = s->streams[0]->codec;
119 /* Chunks sizes must be even */
120 int64_t file_size, end_size;
121 end_size = file_size = url_ftell(pb);
127 if (!url_is_streamed(s->pb)) {
129 url_fseek(pb, aiff->form, SEEK_SET);
130 avio_wb32(pb, file_size - aiff->form - 4);
132 /* Number of sample frames */
133 url_fseek(pb, aiff->frames, SEEK_SET);
134 avio_wb32(pb, (file_size-aiff->ssnd-12)/enc->block_align);
136 /* Sound Data chunk size */
137 url_fseek(pb, aiff->ssnd, SEEK_SET);
138 avio_wb32(pb, file_size - aiff->ssnd - 4);
140 /* return to the end */
141 url_fseek(pb, end_size, SEEK_SET);
143 put_flush_packet(pb);
149 AVOutputFormat ff_aiff_muxer = {
151 NULL_IF_CONFIG_SMALL("Audio IFF"),
154 sizeof(AIFFOutputContext),
160 .codec_tag= (const AVCodecTag* const []){ff_codec_aiff_tags, 0},