-
Notifications
You must be signed in to change notification settings - Fork 387
/
4xm.c
372 lines (321 loc) · 11.6 KB
/
4xm.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
/*
* 4X Technologies .4xm File Demuxer (no muxer)
* Copyright (c) 2003 The FFmpeg project
*
* This file is part of Libav.
*
* Libav is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* Libav is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* 4X Technologies file demuxer
* by Mike Melanson (melanson@pcisys.net)
* for more information on the .4xm file format, visit:
* http://www.pcisys.net/~melanson/codecs/
*/
#include "libavutil/intreadwrite.h"
#include "libavutil/intfloat.h"
#include "avformat.h"
#include "internal.h"
#define RIFF_TAG MKTAG('R', 'I', 'F', 'F')
#define FOURXMV_TAG MKTAG('4', 'X', 'M', 'V')
#define LIST_TAG MKTAG('L', 'I', 'S', 'T')
#define HEAD_TAG MKTAG('H', 'E', 'A', 'D')
#define TRK__TAG MKTAG('T', 'R', 'K', '_')
#define MOVI_TAG MKTAG('M', 'O', 'V', 'I')
#define VTRK_TAG MKTAG('V', 'T', 'R', 'K')
#define STRK_TAG MKTAG('S', 'T', 'R', 'K')
#define std__TAG MKTAG('s', 't', 'd', '_')
#define name_TAG MKTAG('n', 'a', 'm', 'e')
#define vtrk_TAG MKTAG('v', 't', 'r', 'k')
#define strk_TAG MKTAG('s', 't', 'r', 'k')
#define ifrm_TAG MKTAG('i', 'f', 'r', 'm')
#define pfrm_TAG MKTAG('p', 'f', 'r', 'm')
#define cfrm_TAG MKTAG('c', 'f', 'r', 'm')
#define ifr2_TAG MKTAG('i', 'f', 'r', '2')
#define pfr2_TAG MKTAG('p', 'f', 'r', '2')
#define cfr2_TAG MKTAG('c', 'f', 'r', '2')
#define snd__TAG MKTAG('s', 'n', 'd', '_')
#define vtrk_SIZE 0x44
#define strk_SIZE 0x28
#define GET_LIST_HEADER() \
fourcc_tag = avio_rl32(pb); \
size = avio_rl32(pb); \
if (fourcc_tag != LIST_TAG) \
return AVERROR_INVALIDDATA; \
fourcc_tag = avio_rl32(pb);
typedef struct AudioTrack {
int sample_rate;
int bits;
int channels;
int stream_index;
int adpcm;
int64_t audio_pts;
} AudioTrack;
typedef struct FourxmDemuxContext {
int video_stream_index;
int track_count;
AudioTrack *tracks;
int64_t video_pts;
float fps;
} FourxmDemuxContext;
static int fourxm_probe(AVProbeData *p)
{
if ((AV_RL32(&p->buf[0]) != RIFF_TAG) ||
(AV_RL32(&p->buf[8]) != FOURXMV_TAG))
return 0;
return AVPROBE_SCORE_MAX;
}
static int parse_vtrk(AVFormatContext *s,
FourxmDemuxContext *fourxm, uint8_t *buf, int size,
int left)
{
AVStream *st;
/* check that there is enough data */
if (size != vtrk_SIZE || left < size + 8) {
return AVERROR_INVALIDDATA;
}
/* allocate a new AVStream */
st = avformat_new_stream(s, NULL);
if (!st)
return AVERROR(ENOMEM);
avpriv_set_pts_info(st, 60, 1, fourxm->fps);
fourxm->video_stream_index = st->index;
st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
st->codecpar->codec_id = AV_CODEC_ID_4XM;
st->codecpar->extradata = av_mallocz(4 + AV_INPUT_BUFFER_PADDING_SIZE);
if (!st->codecpar->extradata)
return AVERROR(ENOMEM);
st->codecpar->extradata_size = 4;
AV_WL32(st->codecpar->extradata, AV_RL32(buf + 16));
st->codecpar->width = AV_RL32(buf + 36);
st->codecpar->height = AV_RL32(buf + 40);
return 0;
}
static int parse_strk(AVFormatContext *s,
FourxmDemuxContext *fourxm, uint8_t *buf, int size,
int left)
{
AVStream *st;
int track;
/* check that there is enough data */
if (size != strk_SIZE || left < size + 8)
return AVERROR_INVALIDDATA;
track = AV_RL32(buf + 8);
if (track < 0)
return AVERROR_INVALIDDATA;
if (track + 1 > fourxm->track_count) {
if (av_reallocp_array(&fourxm->tracks, track + 1, sizeof(AudioTrack)))
return AVERROR(ENOMEM);
memset(&fourxm->tracks[fourxm->track_count], 0,
sizeof(AudioTrack) * (track + 1 - fourxm->track_count));
fourxm->track_count = track + 1;
}
fourxm->tracks[track].adpcm = AV_RL32(buf + 12);
fourxm->tracks[track].channels = AV_RL32(buf + 36);
fourxm->tracks[track].sample_rate = AV_RL32(buf + 40);
fourxm->tracks[track].bits = AV_RL32(buf + 44);
fourxm->tracks[track].audio_pts = 0;
if (fourxm->tracks[track].channels <= 0 ||
fourxm->tracks[track].sample_rate <= 0 ||
fourxm->tracks[track].bits <= 0) {
av_log(s, AV_LOG_ERROR, "audio header invalid\n");
return AVERROR_INVALIDDATA;
}
/* allocate a new AVStream */
st = avformat_new_stream(s, NULL);
if (!st)
return AVERROR(ENOMEM);
st->id = track;
avpriv_set_pts_info(st, 60, 1, fourxm->tracks[track].sample_rate);
fourxm->tracks[track].stream_index = st->index;
st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
st->codecpar->codec_tag = 0;
st->codecpar->channels = fourxm->tracks[track].channels;
st->codecpar->sample_rate = fourxm->tracks[track].sample_rate;
st->codecpar->bits_per_coded_sample = fourxm->tracks[track].bits;
st->codecpar->bit_rate = st->codecpar->channels *
st->codecpar->sample_rate *
st->codecpar->bits_per_coded_sample;
st->codecpar->block_align = st->codecpar->channels *
st->codecpar->bits_per_coded_sample;
if (fourxm->tracks[track].adpcm){
st->codecpar->codec_id = AV_CODEC_ID_ADPCM_4XM;
} else if (st->codecpar->bits_per_coded_sample == 8) {
st->codecpar->codec_id = AV_CODEC_ID_PCM_U8;
} else
st->codecpar->codec_id = AV_CODEC_ID_PCM_S16LE;
return 0;
}
static int fourxm_read_header(AVFormatContext *s)
{
AVIOContext *pb = s->pb;
unsigned int fourcc_tag;
unsigned int size;
int header_size;
FourxmDemuxContext *fourxm = s->priv_data;
unsigned char *header;
int i, ret;
fourxm->track_count = 0;
fourxm->tracks = NULL;
fourxm->fps = 1.0;
/* skip the first 3 32-bit numbers */
avio_skip(pb, 12);
/* check for LIST-HEAD */
GET_LIST_HEADER();
header_size = size - 4;
if (fourcc_tag != HEAD_TAG || header_size < 0)
return AVERROR_INVALIDDATA;
/* allocate space for the header and load the whole thing */
header = av_malloc(header_size);
if (!header)
return AVERROR(ENOMEM);
if (avio_read(pb, header, header_size) != header_size) {
av_free(header);
return AVERROR(EIO);
}
/* take the lazy approach and search for any and all vtrk and strk chunks */
for (i = 0; i < header_size - 8; i++) {
fourcc_tag = AV_RL32(&header[i]);
size = AV_RL32(&header[i + 4]);
if (fourcc_tag == std__TAG) {
if (header_size - i < 16) {
ret = AVERROR_INVALIDDATA;
goto fail;
}
fourxm->fps = av_int2float(AV_RL32(&header[i + 12]));
} else if (fourcc_tag == vtrk_TAG) {
if ((ret = parse_vtrk(s, fourxm, header + i, size,
header_size - i)) < 0)
goto fail;
i += 8 + size;
} else if (fourcc_tag == strk_TAG) {
if ((ret = parse_strk(s, fourxm, header + i, size,
header_size - i)) < 0)
goto fail;
i += 8 + size;
}
}
/* skip over the LIST-MOVI chunk (which is where the stream should be */
GET_LIST_HEADER();
if (fourcc_tag != MOVI_TAG) {
ret = AVERROR_INVALIDDATA;
goto fail;
}
av_free(header);
/* initialize context members */
fourxm->video_pts = -1; /* first frame will push to 0 */
return 0;
fail:
av_freep(&fourxm->tracks);
av_free(header);
return ret;
}
static int fourxm_read_packet(AVFormatContext *s,
AVPacket *pkt)
{
FourxmDemuxContext *fourxm = s->priv_data;
AVIOContext *pb = s->pb;
unsigned int fourcc_tag;
unsigned int size;
int ret = 0;
unsigned int track_number;
int packet_read = 0;
unsigned char header[8];
int audio_frame_count;
while (!packet_read) {
if ((ret = avio_read(s->pb, header, 8)) < 0)
return ret;
fourcc_tag = AV_RL32(&header[0]);
size = AV_RL32(&header[4]);
if (pb->eof_reached)
return AVERROR(EIO);
switch (fourcc_tag) {
case LIST_TAG:
/* this is a good time to bump the video pts */
fourxm->video_pts++;
/* skip the LIST-* tag and move on to the next fourcc */
avio_rl32(pb);
break;
case ifrm_TAG:
case pfrm_TAG:
case cfrm_TAG:
case ifr2_TAG:
case pfr2_TAG:
case cfr2_TAG:
/* allocate 8 more bytes than 'size' to account for fourcc
* and size */
if (size + 8 < size || av_new_packet(pkt, size + 8))
return AVERROR(EIO);
pkt->stream_index = fourxm->video_stream_index;
pkt->pts = fourxm->video_pts;
pkt->pos = avio_tell(s->pb);
memcpy(pkt->data, header, 8);
ret = avio_read(s->pb, &pkt->data[8], size);
if (ret < 0) {
av_packet_unref(pkt);
} else
packet_read = 1;
break;
case snd__TAG:
track_number = avio_rl32(pb);
avio_skip(pb, 4);
size -= 8;
if (track_number < fourxm->track_count &&
fourxm->tracks[track_number].channels > 0) {
ret = av_get_packet(s->pb, pkt, size);
if (ret < 0)
return AVERROR(EIO);
pkt->stream_index =
fourxm->tracks[track_number].stream_index;
pkt->pts = fourxm->tracks[track_number].audio_pts;
packet_read = 1;
/* pts accounting */
audio_frame_count = size;
if (fourxm->tracks[track_number].adpcm)
audio_frame_count -= 2 * (fourxm->tracks[track_number].channels);
audio_frame_count /= fourxm->tracks[track_number].channels;
if (fourxm->tracks[track_number].adpcm) {
audio_frame_count *= 2;
} else
audio_frame_count /=
(fourxm->tracks[track_number].bits / 8);
fourxm->tracks[track_number].audio_pts += audio_frame_count;
} else {
avio_skip(pb, size);
}
break;
default:
avio_skip(pb, size);
break;
}
}
return ret;
}
static int fourxm_read_close(AVFormatContext *s)
{
FourxmDemuxContext *fourxm = s->priv_data;
av_freep(&fourxm->tracks);
return 0;
}
AVInputFormat ff_fourxm_demuxer = {
.name = "4xm",
.long_name = NULL_IF_CONFIG_SMALL("4X Technologies"),
.priv_data_size = sizeof(FourxmDemuxContext),
.read_probe = fourxm_probe,
.read_header = fourxm_read_header,
.read_packet = fourxm_read_packet,
.read_close = fourxm_read_close,
};