2 * IFF (.iff) file demuxer
3 * Copyright (c) 2008 Jaikrishnan Menon <realityman@gmx.net>
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
25 * by Jaikrishnan Menon
26 * for more information on the .iff file format, visit:
27 * http://wiki.multimedia.cx/index.php?title=IFF
32 #define ID_8SVX MKTAG('8','S','V','X')
33 #define ID_VHDR MKTAG('V','H','D','R')
34 #define ID_ATAK MKTAG('A','T','A','K')
35 #define ID_RLSE MKTAG('R','L','S','E')
36 #define ID_CHAN MKTAG('C','H','A','N')
38 #define ID_FORM MKTAG('F','O','R','M')
39 #define ID_ANNO MKTAG('A','N','N','O')
40 #define ID_AUTH MKTAG('A','U','T','H')
41 #define ID_CHRS MKTAG('C','H','R','S')
42 #define ID_COPYRIGHT MKTAG('(','c',')',' ')
43 #define ID_CSET MKTAG('C','S','E','T')
44 #define ID_FVER MKTAG('F','V','E','R')
45 #define ID_NAME MKTAG('N','A','M','E')
46 #define ID_TEXT MKTAG('T','E','X','T')
47 #define ID_BODY MKTAG('B','O','D','Y')
53 #define PACKET_SIZE 1024
55 typedef enum {COMP_NONE, COMP_FIB, COMP_EXP} svx8_compression_t;
60 uint32_t audio_frame_count;
64 static void interleave_stereo(const uint8_t *src, uint8_t *dest, int size)
66 uint8_t *end = dest + size;
71 *dest++ = *(src+size);
76 static int iff_probe(AVProbeData *p)
78 const uint8_t *d = p->buf;
80 if ( AV_RL32(d) == ID_FORM &&
81 AV_RL32(d+8) == ID_8SVX)
82 return AVPROBE_SCORE_MAX;
86 static int iff_read_header(AVFormatContext *s,
87 AVFormatParameters *ap)
89 IffDemuxContext *iff = s->priv_data;
90 ByteIOContext *pb = s->pb;
92 uint32_t chunk_id, data_size;
93 int padding, done = 0;
95 st = av_new_stream(s, 0);
97 return AVERROR(ENOMEM);
99 st->codec->channels = 1;
102 while(!done && !url_feof(pb)) {
103 chunk_id = get_le32(pb);
104 data_size = get_be32(pb);
105 padding = data_size & 1;
110 st->codec->sample_rate = get_be16(pb);
112 st->codec->codec_tag = get_byte(pb);
117 iff->body_size = data_size;
122 st->codec->channels = (get_be32(pb) < 6) ? 1 : 2;
126 url_fseek(pb, data_size + padding, SEEK_CUR);
131 if(!st->codec->sample_rate)
132 return AVERROR_INVALIDDATA;
134 av_set_pts_info(st, 32, 1, st->codec->sample_rate);
135 st->codec->codec_type = CODEC_TYPE_AUDIO;
137 switch(st->codec->codec_tag) {
139 st->codec->codec_id = CODEC_ID_PCM_S8;
142 st->codec->codec_id = CODEC_ID_8SVX_FIB;
145 st->codec->codec_id = CODEC_ID_8SVX_EXP;
148 av_log(s, AV_LOG_ERROR, "iff: unknown compression method\n");
152 st->codec->bits_per_coded_sample = 8;
153 st->codec->bit_rate = st->codec->channels * st->codec->sample_rate * st->codec->bits_per_coded_sample;
154 st->codec->block_align = st->codec->channels * st->codec->bits_per_coded_sample;
159 static int iff_read_packet(AVFormatContext *s,
162 IffDemuxContext *iff = s->priv_data;
163 ByteIOContext *pb = s->pb;
166 if(iff->sent_bytes > iff->body_size)
169 if(s->streams[0]->codec->channels == 2) {
170 uint8_t sample_buffer[PACKET_SIZE];
172 ret = get_buffer(pb, sample_buffer, PACKET_SIZE);
173 if(av_new_packet(pkt, PACKET_SIZE) < 0) {
174 av_log(s, AV_LOG_ERROR, "iff: cannot allocate packet \n");
175 return AVERROR(ENOMEM);
177 interleave_stereo(sample_buffer, pkt->data, PACKET_SIZE);
180 ret = av_get_packet(pb, pkt, PACKET_SIZE);
183 if(iff->sent_bytes == 0)
184 pkt->flags |= PKT_FLAG_KEY;
186 iff->sent_bytes += PACKET_SIZE;
187 pkt->stream_index = 0;
188 pkt->pts = iff->audio_frame_count;
189 iff->audio_frame_count += ret / s->streams[0]->codec->channels;
193 AVInputFormat iff_demuxer = {
195 NULL_IF_CONFIG_SMALL("IFF format"),
196 sizeof(IffDemuxContext),