Statistics
| Branch: | Revision:

ffmpeg / libavformat / iff.c @ e5953464

History | View | Annotate | Download (8.84 KB)

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
};