Reindent / reformat some code with broken indenting.
[ffmpeg.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 {
64     COMP_NONE,
65     COMP_FIB,
66     COMP_EXP
67 } svx8_compression_type;
68
69 typedef enum {
70     BITMAP_RAW,
71     BITMAP_BYTERUN1
72 } bitmap_compression_type;
73
74 typedef struct {
75     uint32_t  body_size;
76     uint32_t  sent_bytes;
77     uint32_t  audio_frame_count;
78 } IffDemuxContext;
79
80
81 static void interleave_stereo(const uint8_t *src, uint8_t *dest, int size)
82 {
83     uint8_t *end = dest + size;
84     size = size>>1;
85
86     while(dest < end) {
87         *dest++ = *src;
88         *dest++ = *(src+size);
89         src++;
90     }
91 }
92
93 static int iff_probe(AVProbeData *p)
94 {
95     const uint8_t *d = p->buf;
96
97     if ( AV_RL32(d)   == ID_FORM &&
98          (AV_RL32(d+8) == ID_8SVX || AV_RL32(d+8) == ID_PBM || AV_RL32(d+8) == ID_ILBM) )
99         return AVPROBE_SCORE_MAX;
100     return 0;
101 }
102
103 static int iff_read_header(AVFormatContext *s,
104                            AVFormatParameters *ap)
105 {
106     IffDemuxContext *iff = s->priv_data;
107     ByteIOContext *pb = s->pb;
108     AVStream *st;
109     uint32_t chunk_id, data_size;
110     int padding, done = 0;
111     int compression = -1;
112     char *buf;
113
114     st = av_new_stream(s, 0);
115     if (!st)
116       return AVERROR(ENOMEM);
117
118     st->codec->channels = 1;
119     url_fskip(pb, 8);
120     // codec_tag used by ByteRun1 decoder to distinguish progressive (PBM) and interlaced (ILBM) content
121     st->codec->codec_tag = get_le32(pb);
122
123     while(!done && !url_feof(pb)) {
124         chunk_id = get_le32(pb);
125         data_size = get_be32(pb);
126         padding = data_size & 1;
127
128         switch(chunk_id) {
129         case ID_VHDR:
130             st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
131             url_fskip(pb, 12);
132             st->codec->sample_rate = get_be16(pb);
133             url_fskip(pb, 1);
134             compression            = get_byte(pb);
135             url_fskip(pb, 4);
136             break;
137
138         case ID_BODY:
139             iff->body_size = data_size;
140             done = 1;
141             break;
142
143         case ID_CHAN:
144             st->codec->channels = (get_be32(pb) < 6) ? 1 : 2;
145             break;
146
147         case ID_CMAP:
148             st->codec->extradata_size = data_size;
149             st->codec->extradata      = av_malloc(data_size);
150             if (!st->codec->extradata)
151                 return AVERROR(ENOMEM);
152             if (get_buffer(pb, st->codec->extradata, data_size) < 0)
153                 return AVERROR(EIO);
154             break;
155
156         case ID_BMHD:
157             st->codec->codec_type            = AVMEDIA_TYPE_VIDEO;
158             st->codec->width                 = get_be16(pb);
159             st->codec->height                = get_be16(pb);
160             url_fskip(pb, 4); // x, y offset
161             st->codec->bits_per_coded_sample = get_byte(pb);
162             url_fskip(pb, 1); // masking
163             compression                      = get_byte(pb);
164             url_fskip(pb, 3); // paddding, transparent
165             st->sample_aspect_ratio.num      = get_byte(pb);
166             st->sample_aspect_ratio.den      = get_byte(pb);
167             url_fskip(pb, 4); // source page width, height
168             break;
169
170         case ID_ANNO:
171             buf = av_malloc(data_size + 1);
172             if (!buf)
173                 break;
174             get_buffer(pb, buf, data_size);
175             buf[data_size] = 0;
176             av_metadata_set2(&s->metadata, "comment", buf, AV_METADATA_DONT_STRDUP_VAL);
177             break;
178
179         default:
180             url_fseek(pb, data_size + padding, SEEK_CUR);
181             break;
182         }
183     }
184
185     switch(st->codec->codec_type) {
186     case AVMEDIA_TYPE_AUDIO:
187         av_set_pts_info(st, 32, 1, st->codec->sample_rate);
188
189         switch(compression) {
190         case COMP_NONE:
191             st->codec->codec_id = CODEC_ID_PCM_S8;
192             break;
193         case COMP_FIB:
194             st->codec->codec_id = CODEC_ID_8SVX_FIB;
195             break;
196         case COMP_EXP:
197             st->codec->codec_id = CODEC_ID_8SVX_EXP;
198             break;
199         default:
200             av_log(s, AV_LOG_ERROR, "iff: unknown compression method\n");
201             return -1;
202         }
203
204         st->codec->bits_per_coded_sample = 8;
205         st->codec->bit_rate = st->codec->channels * st->codec->sample_rate * st->codec->bits_per_coded_sample;
206         st->codec->block_align = st->codec->channels * st->codec->bits_per_coded_sample;
207         break;
208
209     case AVMEDIA_TYPE_VIDEO:
210         switch (compression) {
211         case BITMAP_RAW:
212             if (st->codec->codec_tag == ID_ILBM) {
213                 st->codec->codec_id = CODEC_ID_IFF_ILBM;
214             } else {
215                 st->codec->codec_id = CODEC_ID_RAWVIDEO;
216                 st->codec->pix_fmt  = PIX_FMT_PAL8;
217                 st->codec->codec_tag = 0;
218             }
219             break;
220         case BITMAP_BYTERUN1:
221             st->codec->codec_id = CODEC_ID_IFF_BYTERUN1;
222             break;
223         default:
224             av_log(s, AV_LOG_ERROR, "unknown compression method\n");
225             return AVERROR_INVALIDDATA;
226         }
227         break;
228     default:
229         return -1;
230     }
231
232     return 0;
233 }
234
235 static int iff_read_packet(AVFormatContext *s,
236                            AVPacket *pkt)
237 {
238     IffDemuxContext *iff = s->priv_data;
239     ByteIOContext *pb = s->pb;
240     AVStream *st = s->streams[0];
241     int ret;
242
243     if(iff->sent_bytes >= iff->body_size)
244         return AVERROR(EIO);
245
246     if(s->streams[0]->codec->channels == 2) {
247         uint8_t sample_buffer[PACKET_SIZE];
248
249         ret = get_buffer(pb, sample_buffer, PACKET_SIZE);
250         if(av_new_packet(pkt, PACKET_SIZE) < 0) {
251             av_log(s, AV_LOG_ERROR, "iff: cannot allocate packet \n");
252             return AVERROR(ENOMEM);
253         }
254         interleave_stereo(sample_buffer, pkt->data, PACKET_SIZE);
255     } else if (s->streams[0]->codec->codec_id == CODEC_ID_RAWVIDEO) {
256         if(av_new_packet(pkt, iff->body_size + AVPALETTE_SIZE) < 0) {
257             return AVERROR(ENOMEM);
258         }
259
260         ret = ff_cmap_read_palette(st->codec, (uint32_t*)(pkt->data + iff->body_size));
261         if (ret < 0)
262             return ret;
263         av_freep(&st->codec->extradata);
264         st->codec->extradata_size = 0;
265
266         ret = get_buffer(pb, pkt->data, iff->body_size);
267     } else if (s->streams[0]->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
268         ret = av_get_packet(pb, pkt, iff->body_size);
269     } else {
270         ret = av_get_packet(pb, pkt, PACKET_SIZE);
271     }
272
273     if(iff->sent_bytes == 0)
274         pkt->flags |= AV_PKT_FLAG_KEY;
275
276     if(s->streams[0]->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
277         iff->sent_bytes += PACKET_SIZE;
278     } else {
279         iff->sent_bytes = iff->body_size;
280     }
281     pkt->stream_index = 0;
282     if(s->streams[0]->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
283         pkt->pts = iff->audio_frame_count;
284         iff->audio_frame_count += ret / s->streams[0]->codec->channels;
285     }
286     return ret;
287 }
288
289 AVInputFormat iff_demuxer = {
290     "IFF",
291     NULL_IF_CONFIG_SMALL("IFF format"),
292     sizeof(IffDemuxContext),
293     iff_probe,
294     iff_read_header,
295     iff_read_packet,
296 };