59891d91d76a3f8becce63d4f56ba3a8f8f2e674
[libav.git] / libavformat / iff.c
1 /*
2 * IFF (.iff) file demuxer
3 * Copyright (c) 2008 Jaikrishnan Menon <realityman@gmx.net>
4 * Copyright (c) 2010 Peter Ross <pross@xvid.org>
5 *
6 * This file is part of FFmpeg.
7 *
8 * FFmpeg is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
12 *
13 * FFmpeg is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
17 *
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 */
22
23 /**
24 * @file
25 * IFF file demuxer
26 * by Jaikrishnan Menon
27 * for more information on the .iff file format, visit:
28 * http://wiki.multimedia.cx/index.php?title=IFF
29 */
30
31 #include "libavutil/intreadwrite.h"
32 #include "libavcodec/iff.h"
33 #include "avformat.h"
34
35 #define ID_8SVX MKTAG('8','S','V','X')
36 #define ID_VHDR MKTAG('V','H','D','R')
37 #define ID_ATAK MKTAG('A','T','A','K')
38 #define ID_RLSE MKTAG('R','L','S','E')
39 #define ID_CHAN MKTAG('C','H','A','N')
40 #define ID_PBM MKTAG('P','B','M',' ')
41 #define ID_ILBM MKTAG('I','L','B','M')
42 #define ID_BMHD MKTAG('B','M','H','D')
43 #define ID_CMAP MKTAG('C','M','A','P')
44
45 #define ID_FORM MKTAG('F','O','R','M')
46 #define ID_ANNO MKTAG('A','N','N','O')
47 #define ID_AUTH MKTAG('A','U','T','H')
48 #define ID_CHRS MKTAG('C','H','R','S')
49 #define ID_COPYRIGHT MKTAG('(','c',')',' ')
50 #define ID_CSET MKTAG('C','S','E','T')
51 #define ID_FVER MKTAG('F','V','E','R')
52 #define ID_NAME MKTAG('N','A','M','E')
53 #define ID_TEXT MKTAG('T','E','X','T')
54 #define ID_BODY MKTAG('B','O','D','Y')
55 #define ID_ANNO MKTAG('A','N','N','O')
56
57 #define LEFT 2
58 #define RIGHT 4
59 #define STEREO 6
60
61 #define PACKET_SIZE 1024
62
63 typedef enum {COMP_NONE, COMP_FIB, COMP_EXP} svx8_compression_type;
64 typedef enum {BITMAP_RAW, BITMAP_BYTERUN1} bitmap_compression_type;
65
66 typedef struct {
67 uint32_t body_size;
68 uint32_t sent_bytes;
69 uint32_t audio_frame_count;
70 } IffDemuxContext;
71
72
73 static void interleave_stereo(const uint8_t *src, uint8_t *dest, int size)
74 {
75 uint8_t *end = dest + size;
76 size = size>>1;
77
78 while(dest < end) {
79 *dest++ = *src;
80 *dest++ = *(src+size);
81 src++;
82 }
83 }
84
85 static int iff_probe(AVProbeData *p)
86 {
87 const uint8_t *d = p->buf;
88
89 if ( AV_RL32(d) == ID_FORM &&
90 (AV_RL32(d+8) == ID_8SVX || AV_RL32(d+8) == ID_PBM || AV_RL32(d+8) == ID_ILBM) )
91 return AVPROBE_SCORE_MAX;
92 return 0;
93 }
94
95 static int iff_read_header(AVFormatContext *s,
96 AVFormatParameters *ap)
97 {
98 IffDemuxContext *iff = s->priv_data;
99 ByteIOContext *pb = s->pb;
100 AVStream *st;
101 uint32_t chunk_id, data_size;
102 int padding, done = 0;
103 int compression = -1;
104 char *buf;
105
106 st = av_new_stream(s, 0);
107 if (!st)
108 return AVERROR(ENOMEM);
109
110 st->codec->channels = 1;
111 url_fskip(pb, 8);
112 // codec_tag used by ByteRun1 decoder to distinguish progressive (PBM) and interlaced (ILBM) content
113 st->codec->codec_tag = get_le32(pb);
114
115 while(!done && !url_feof(pb)) {
116 chunk_id = get_le32(pb);
117 data_size = get_be32(pb);
118 padding = data_size & 1;
119
120 switch(chunk_id) {
121 case ID_VHDR:
122 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
123 url_fskip(pb, 12);
124 st->codec->sample_rate = get_be16(pb);
125 url_fskip(pb, 1);
126 compression = get_byte(pb);
127 url_fskip(pb, 4);
128 break;
129
130 case ID_BODY:
131 iff->body_size = data_size;
132 done = 1;
133 break;
134
135 case ID_CHAN:
136 st->codec->channels = (get_be32(pb) < 6) ? 1 : 2;
137 break;
138
139 case ID_CMAP:
140 st->codec->extradata_size = data_size;
141 st->codec->extradata = av_malloc(data_size);
142 if (!st->codec->extradata)
143 return AVERROR(ENOMEM);
144 if (get_buffer(pb, st->codec->extradata, data_size) < 0)
145 return AVERROR(EIO);
146 break;
147
148 case ID_BMHD:
149 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
150 st->codec->width = get_be16(pb);
151 st->codec->height = get_be16(pb);
152 url_fskip(pb, 4); // x, y offset
153 st->codec->bits_per_coded_sample = get_byte(pb);
154 url_fskip(pb, 1); // masking
155 compression = get_byte(pb);
156 url_fskip(pb, 3); // paddding, transparent
157 st->sample_aspect_ratio.num = get_byte(pb);
158 st->sample_aspect_ratio.den = get_byte(pb);
159 url_fskip(pb, 4); // source page width, height
160 break;
161
162 case ID_ANNO:
163 buf = av_malloc(data_size + 1);
164 if (!buf)
165 break;
166 get_buffer(pb, buf, data_size);
167 buf[data_size] = 0;
168 av_metadata_set2(&s->metadata, "comment", buf, AV_METADATA_DONT_STRDUP_VAL);
169 break;
170
171 default:
172 url_fseek(pb, data_size + padding, SEEK_CUR);
173 break;
174 }
175 }
176
177 switch(st->codec->codec_type) {
178 case AVMEDIA_TYPE_AUDIO:
179 av_set_pts_info(st, 32, 1, st->codec->sample_rate);
180
181 switch(compression) {
182 case COMP_NONE:
183 st->codec->codec_id = CODEC_ID_PCM_S8;
184 break;
185 case COMP_FIB:
186 st->codec->codec_id = CODEC_ID_8SVX_FIB;
187 break;
188 case COMP_EXP:
189 st->codec->codec_id = CODEC_ID_8SVX_EXP;
190 break;
191 default:
192 av_log(s, AV_LOG_ERROR, "iff: unknown compression method\n");
193 return -1;
194 }
195
196 st->codec->bits_per_coded_sample = 8;
197 st->codec->bit_rate = st->codec->channels * st->codec->sample_rate * st->codec->bits_per_coded_sample;
198 st->codec->block_align = st->codec->channels * st->codec->bits_per_coded_sample;
199 break;
200
201 case AVMEDIA_TYPE_VIDEO:
202 switch (compression) {
203 case BITMAP_RAW:
204 if (st->codec->codec_tag == ID_ILBM) {
205 st->codec->codec_id = CODEC_ID_IFF_ILBM;
206 } else {
207 st->codec->codec_id = CODEC_ID_RAWVIDEO;
208 st->codec->pix_fmt = PIX_FMT_PAL8;
209 st->codec->codec_tag = 0;
210 }
211 break;
212 case BITMAP_BYTERUN1:
213 st->codec->codec_id = CODEC_ID_IFF_BYTERUN1;
214 break;
215 default:
216 av_log(s, AV_LOG_ERROR, "unknown compression method\n");
217 return AVERROR_INVALIDDATA;
218 }
219 break;
220 default:
221 return -1;
222 }
223
224 return 0;
225 }
226
227 static int iff_read_packet(AVFormatContext *s,
228 AVPacket *pkt)
229 {
230 IffDemuxContext *iff = s->priv_data;
231 ByteIOContext *pb = s->pb;
232 AVStream *st = s->streams[0];
233 int ret;
234
235 if(iff->sent_bytes >= iff->body_size)
236 return AVERROR(EIO);
237
238 if(s->streams[0]->codec->channels == 2) {
239 uint8_t sample_buffer[PACKET_SIZE];
240
241 ret = get_buffer(pb, sample_buffer, PACKET_SIZE);
242 if(av_new_packet(pkt, PACKET_SIZE) < 0) {
243 av_log(s, AV_LOG_ERROR, "iff: cannot allocate packet \n");
244 return AVERROR(ENOMEM);
245 }
246 interleave_stereo(sample_buffer, pkt->data, PACKET_SIZE);
247 } else if (s->streams[0]->codec->codec_id == CODEC_ID_RAWVIDEO) {
248 if(av_new_packet(pkt, iff->body_size + AVPALETTE_SIZE) < 0) {
249 return AVERROR(ENOMEM);
250 }
251
252 ret = ff_cmap_read_palette(st->codec, (uint32_t*)(pkt->data + iff->body_size));
253 if (ret < 0)
254 return ret;
255 av_freep(&st->codec->extradata);
256 st->codec->extradata_size = 0;
257
258 ret = get_buffer(pb, pkt->data, iff->body_size);
259 } else if (s->streams[0]->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
260 ret = av_get_packet(pb, pkt, iff->body_size);
261 } else {
262 ret = av_get_packet(pb, pkt, PACKET_SIZE);
263 }
264
265 if(iff->sent_bytes == 0)
266 pkt->flags |= AV_PKT_FLAG_KEY;
267
268 if(s->streams[0]->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
269 iff->sent_bytes += PACKET_SIZE;
270 } else {
271 iff->sent_bytes = iff->body_size;
272 }
273 pkt->stream_index = 0;
274 if(s->streams[0]->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
275 pkt->pts = iff->audio_frame_count;
276 iff->audio_frame_count += ret / s->streams[0]->codec->channels;
277 }
278 return ret;
279 }
280
281 AVInputFormat iff_demuxer = {
282 "IFF",
283 NULL_IF_CONFIG_SMALL("IFF format"),
284 sizeof(IffDemuxContext),
285 iff_probe,
286 iff_read_header,
287 iff_read_packet,
288 };