Statistics
| Branch: | Revision:

ffmpeg / libavformat / 4xm.c @ e63a3628

History | View | Annotate | Download (11.4 KB)

1
/*
2
 * 4X Technologies .4xm File Demuxer (no muxer)
3
 * Copyright (c) 2003  The ffmpeg Project
4
 *
5
 * This file is part of FFmpeg.
6
 *
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.
11
 *
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.
16
 *
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
20
 */
21

    
22
/**
23
 * @file
24
 * 4X Technologies file demuxer
25
 * by Mike Melanson (melanson@pcisys.net)
26
 * for more information on the .4xm file format, visit:
27
 *   http://www.pcisys.net/~melanson/codecs/
28
 */
29

    
30
#include "libavutil/intreadwrite.h"
31
#include "avformat.h"
32

    
33
#define     RIFF_TAG MKTAG('R', 'I', 'F', 'F')
34
#define  FOURXMV_TAG MKTAG('4', 'X', 'M', 'V')
35
#define     LIST_TAG MKTAG('L', 'I', 'S', 'T')
36
#define     HEAD_TAG MKTAG('H', 'E', 'A', 'D')
37
#define     TRK__TAG MKTAG('T', 'R', 'K', '_')
38
#define     MOVI_TAG MKTAG('M', 'O', 'V', 'I')
39
#define     VTRK_TAG MKTAG('V', 'T', 'R', 'K')
40
#define     STRK_TAG MKTAG('S', 'T', 'R', 'K')
41
#define     std__TAG MKTAG('s', 't', 'd', '_')
42
#define     name_TAG MKTAG('n', 'a', 'm', 'e')
43
#define     vtrk_TAG MKTAG('v', 't', 'r', 'k')
44
#define     strk_TAG MKTAG('s', 't', 'r', 'k')
45
#define     ifrm_TAG MKTAG('i', 'f', 'r', 'm')
46
#define     pfrm_TAG MKTAG('p', 'f', 'r', 'm')
47
#define     cfrm_TAG MKTAG('c', 'f', 'r', 'm')
48
#define     ifr2_TAG MKTAG('i', 'f', 'r', '2')
49
#define     pfr2_TAG MKTAG('p', 'f', 'r', '2')
50
#define     cfr2_TAG MKTAG('c', 'f', 'r', '2')
51
#define     snd__TAG MKTAG('s', 'n', 'd', '_')
52

    
53
#define vtrk_SIZE 0x44
54
#define strk_SIZE 0x28
55

    
56
#define GET_LIST_HEADER() \
57
    fourcc_tag = avio_rl32(pb); \
58
    size = avio_rl32(pb); \
59
    if (fourcc_tag != LIST_TAG) \
60
        return AVERROR_INVALIDDATA; \
61
    fourcc_tag = avio_rl32(pb);
62

    
63
typedef struct AudioTrack {
64
    int sample_rate;
65
    int bits;
66
    int channels;
67
    int stream_index;
68
    int adpcm;
69
    int64_t audio_pts;
70
} AudioTrack;
71

    
72
typedef struct FourxmDemuxContext {
73
    int width;
74
    int height;
75
    int video_stream_index;
76
    int track_count;
77
    AudioTrack *tracks;
78

    
79
    int64_t video_pts;
80
    float fps;
81
} FourxmDemuxContext;
82

    
83
static int fourxm_probe(AVProbeData *p)
84
{
85
    if ((AV_RL32(&p->buf[0]) != RIFF_TAG) ||
86
        (AV_RL32(&p->buf[8]) != FOURXMV_TAG))
87
        return 0;
88

    
89
    return AVPROBE_SCORE_MAX;
90
}
91

    
92
static int fourxm_read_header(AVFormatContext *s,
93
                              AVFormatParameters *ap)
94
{
95
    AVIOContext *pb = s->pb;
96
    unsigned int fourcc_tag;
97
    unsigned int size;
98
    int header_size;
99
    FourxmDemuxContext *fourxm = s->priv_data;
100
    unsigned char *header;
101
    int i, ret;
102
    AVStream *st;
103

    
104
    fourxm->track_count = 0;
105
    fourxm->tracks = NULL;
106
    fourxm->fps = 1.0;
107

    
108
    /* skip the first 3 32-bit numbers */
109
    url_fseek(pb, 12, SEEK_CUR);
110

    
111
    /* check for LIST-HEAD */
112
    GET_LIST_HEADER();
113
    header_size = size - 4;
114
    if (fourcc_tag != HEAD_TAG || header_size < 0)
115
        return AVERROR_INVALIDDATA;
116

    
117
    /* allocate space for the header and load the whole thing */
118
    header = av_malloc(header_size);
119
    if (!header)
120
        return AVERROR(ENOMEM);
121
    if (avio_read(pb, header, header_size) != header_size){
122
        av_free(header);
123
        return AVERROR(EIO);
124
    }
125

    
126
    /* take the lazy approach and search for any and all vtrk and strk chunks */
127
    for (i = 0; i < header_size - 8; i++) {
128
        fourcc_tag = AV_RL32(&header[i]);
129
        size = AV_RL32(&header[i + 4]);
130

    
131
        if (fourcc_tag == std__TAG) {
132
            fourxm->fps = av_int2flt(AV_RL32(&header[i + 12]));
133
        } else if (fourcc_tag == vtrk_TAG) {
134
            /* check that there is enough data */
135
            if (size != vtrk_SIZE) {
136
                ret= AVERROR_INVALIDDATA;
137
                goto fail;
138
            }
139
            fourxm->width  = AV_RL32(&header[i + 36]);
140
            fourxm->height = AV_RL32(&header[i + 40]);
141

    
142
            /* allocate a new AVStream */
143
            st = av_new_stream(s, 0);
144
            if (!st){
145
                ret= AVERROR(ENOMEM);
146
                goto fail;
147
            }
148
            av_set_pts_info(st, 60, 1, fourxm->fps);
149

    
150
            fourxm->video_stream_index = st->index;
151

    
152
            st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
153
            st->codec->codec_id = CODEC_ID_4XM;
154
            st->codec->extradata_size = 4;
155
            st->codec->extradata = av_malloc(4);
156
            AV_WL32(st->codec->extradata, AV_RL32(&header[i + 16]));
157
            st->codec->width  = fourxm->width;
158
            st->codec->height = fourxm->height;
159

    
160
            i += 8 + size;
161
        } else if (fourcc_tag == strk_TAG) {
162
            int current_track;
163
            /* check that there is enough data */
164
            if (size != strk_SIZE) {
165
                ret= AVERROR_INVALIDDATA;
166
                goto fail;
167
            }
168
            current_track = AV_RL32(&header[i + 8]);
169
            if((unsigned)current_track >= UINT_MAX / sizeof(AudioTrack) - 1){
170
                av_log(s, AV_LOG_ERROR, "current_track too large\n");
171
                ret= -1;
172
                goto fail;
173
            }
174
            if (current_track + 1 > fourxm->track_count) {
175
                fourxm->track_count = current_track + 1;
176
                fourxm->tracks = av_realloc(fourxm->tracks,
177
                    fourxm->track_count * sizeof(AudioTrack));
178
                if (!fourxm->tracks) {
179
                    ret=  AVERROR(ENOMEM);
180
                    goto fail;
181
                }
182
            }
183
            fourxm->tracks[current_track].adpcm       = AV_RL32(&header[i + 12]);
184
            fourxm->tracks[current_track].channels    = AV_RL32(&header[i + 36]);
185
            fourxm->tracks[current_track].sample_rate = AV_RL32(&header[i + 40]);
186
            fourxm->tracks[current_track].bits        = AV_RL32(&header[i + 44]);
187
            fourxm->tracks[current_track].audio_pts   = 0;
188
            if(   fourxm->tracks[current_track].channels    <= 0
189
               || fourxm->tracks[current_track].sample_rate <= 0
190
               || fourxm->tracks[current_track].bits        <  0){
191
                av_log(s, AV_LOG_ERROR, "audio header invalid\n");
192
                ret= -1;
193
                goto fail;
194
            }
195
            i += 8 + size;
196

    
197
            /* allocate a new AVStream */
198
            st = av_new_stream(s, current_track);
199
            if (!st){
200
                ret= AVERROR(ENOMEM);
201
                goto fail;
202
            }
203

    
204
            av_set_pts_info(st, 60, 1, fourxm->tracks[current_track].sample_rate);
205

    
206
            fourxm->tracks[current_track].stream_index = st->index;
207

    
208
            st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
209
            st->codec->codec_tag = 0;
210
            st->codec->channels              = fourxm->tracks[current_track].channels;
211
            st->codec->sample_rate           = fourxm->tracks[current_track].sample_rate;
212
            st->codec->bits_per_coded_sample = fourxm->tracks[current_track].bits;
213
            st->codec->bit_rate              = st->codec->channels * st->codec->sample_rate *
214
                st->codec->bits_per_coded_sample;
215
            st->codec->block_align = st->codec->channels * st->codec->bits_per_coded_sample;
216
            if (fourxm->tracks[current_track].adpcm){
217
                st->codec->codec_id = CODEC_ID_ADPCM_4XM;
218
            }else if (st->codec->bits_per_coded_sample == 8){
219
                st->codec->codec_id = CODEC_ID_PCM_U8;
220
            }else
221
                st->codec->codec_id = CODEC_ID_PCM_S16LE;
222
        }
223
    }
224

    
225
    /* skip over the LIST-MOVI chunk (which is where the stream should be */
226
    GET_LIST_HEADER();
227
    if (fourcc_tag != MOVI_TAG){
228
        ret= AVERROR_INVALIDDATA;
229
        goto fail;
230
    }
231

    
232
    av_free(header);
233
    /* initialize context members */
234
    fourxm->video_pts = -1;  /* first frame will push to 0 */
235

    
236
    return 0;
237
fail:
238
    av_freep(&fourxm->tracks);
239
    av_free(header);
240
    return ret;
241
}
242

    
243
static int fourxm_read_packet(AVFormatContext *s,
244
                              AVPacket *pkt)
245
{
246
    FourxmDemuxContext *fourxm = s->priv_data;
247
    AVIOContext *pb = s->pb;
248
    unsigned int fourcc_tag;
249
    unsigned int size, out_size;
250
    int ret = 0;
251
    unsigned int track_number;
252
    int packet_read = 0;
253
    unsigned char header[8];
254
    int audio_frame_count;
255

    
256
    while (!packet_read) {
257

    
258
        if ((ret = avio_read(s->pb, header, 8)) < 0)
259
            return ret;
260
        fourcc_tag = AV_RL32(&header[0]);
261
        size = AV_RL32(&header[4]);
262
        if (url_feof(pb))
263
            return AVERROR(EIO);
264
        switch (fourcc_tag) {
265

    
266
        case LIST_TAG:
267
            /* this is a good time to bump the video pts */
268
            fourxm->video_pts ++;
269

    
270
            /* skip the LIST-* tag and move on to the next fourcc */
271
            avio_rl32(pb);
272
            break;
273

    
274
        case ifrm_TAG:
275
        case pfrm_TAG:
276
        case cfrm_TAG:
277
        case ifr2_TAG:
278
        case pfr2_TAG:
279
        case cfr2_TAG:
280
            /* allocate 8 more bytes than 'size' to account for fourcc
281
             * and size */
282
            if (size + 8 < size || av_new_packet(pkt, size + 8))
283
                return AVERROR(EIO);
284
            pkt->stream_index = fourxm->video_stream_index;
285
            pkt->pts = fourxm->video_pts;
286
            pkt->pos = url_ftell(s->pb);
287
            memcpy(pkt->data, header, 8);
288
            ret = avio_read(s->pb, &pkt->data[8], size);
289

    
290
            if (ret < 0){
291
                av_free_packet(pkt);
292
            }else
293
                packet_read = 1;
294
            break;
295

    
296
        case snd__TAG:
297
            track_number = avio_rl32(pb);
298
            out_size= avio_rl32(pb);
299
            size-=8;
300

    
301
            if (track_number < fourxm->track_count && fourxm->tracks[track_number].channels>0) {
302
                ret= av_get_packet(s->pb, pkt, size);
303
                if(ret<0)
304
                    return AVERROR(EIO);
305
                pkt->stream_index =
306
                    fourxm->tracks[track_number].stream_index;
307
                pkt->pts = fourxm->tracks[track_number].audio_pts;
308
                packet_read = 1;
309

    
310
                /* pts accounting */
311
                audio_frame_count = size;
312
                if (fourxm->tracks[track_number].adpcm)
313
                    audio_frame_count -=
314
                        2 * (fourxm->tracks[track_number].channels);
315
                audio_frame_count /=
316
                      fourxm->tracks[track_number].channels;
317
                if (fourxm->tracks[track_number].adpcm){
318
                    audio_frame_count *= 2;
319
                }else
320
                    audio_frame_count /=
321
                    (fourxm->tracks[track_number].bits / 8);
322
                fourxm->tracks[track_number].audio_pts += audio_frame_count;
323

    
324
            } else {
325
                url_fseek(pb, size, SEEK_CUR);
326
            }
327
            break;
328

    
329
        default:
330
            url_fseek(pb, size, SEEK_CUR);
331
            break;
332
        }
333
    }
334
    return ret;
335
}
336

    
337
static int fourxm_read_close(AVFormatContext *s)
338
{
339
    FourxmDemuxContext *fourxm = s->priv_data;
340

    
341
    av_freep(&fourxm->tracks);
342

    
343
    return 0;
344
}
345

    
346
AVInputFormat ff_fourxm_demuxer = {
347
    "4xm",
348
    NULL_IF_CONFIG_SMALL("4X Technologies format"),
349
    sizeof(FourxmDemuxContext),
350
    fourxm_probe,
351
    fourxm_read_header,
352
    fourxm_read_packet,
353
    fourxm_read_close,
354
};