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
|
/*
* NuppelVideo demuxer.
* Copyright (c) 2006 Reimar Doeffinger
*
* This file is part of FFmpeg.
*
* FFmpeg 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.
*
* FFmpeg 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 FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "libavutil/intreadwrite.h"
#include "avformat.h"
#include "riff.h"
typedef struct {
int v_id;
int a_id;
int rtjpg_video;
} NUVContext;
typedef enum {
NUV_VIDEO = 'V',
NUV_EXTRADATA = 'D',
NUV_AUDIO = 'A',
NUV_SEEKP = 'R',
NUV_MYTHEXT = 'X'
} nuv_frametype;
static int nuv_probe(AVProbeData *p) {
if (!memcmp(p->buf, "NuppelVideo", 12))
return AVPROBE_SCORE_MAX;
if (!memcmp(p->buf, "MythTVVideo", 12))
return AVPROBE_SCORE_MAX;
return 0;
}
//! little macro to sanitize packet size
#define PKTSIZE(s) (s & 0xffffff)
/**
* \brief read until we found all data needed for decoding
* \param vst video stream of which to change parameters
* \param ast video stream of which to change parameters
* \param myth set if this is a MythTVVideo format file
* \return 1 if all required codec data was found
*/
static int get_codec_data(ByteIOContext *pb, AVStream *vst,
AVStream *ast, int myth) {
nuv_frametype frametype;
if (!vst && !myth)
return 1; // no codec data needed
while (!url_feof(pb)) {
int size, subtype;
frametype = get_byte(pb);
switch (frametype) {
case NUV_EXTRADATA:
subtype = get_byte(pb);
url_fskip(pb, 6);
size = PKTSIZE(get_le32(pb));
if (vst && subtype == 'R') {
vst->codec->extradata_size = size;
vst->codec->extradata = av_malloc(size);
get_buffer(pb, vst->codec->extradata, size);
size = 0;
if (!myth)
return 1;
}
break;
case NUV_MYTHEXT:
url_fskip(pb, 7);
size = PKTSIZE(get_le32(pb));
if (size != 128 * 4)
break;
get_le32(pb); // version
if (vst) {
vst->codec->codec_tag = get_le32(pb);
vst->codec->codec_id =
codec_get_id(codec_bmp_tags, vst->codec->codec_tag);
if (vst->codec->codec_tag == MKTAG('R', 'J', 'P', 'G'))
vst->codec->codec_id = CODEC_ID_NUV;
} else
url_fskip(pb, 4);
if (ast) {
ast->codec->codec_tag = get_le32(pb);
ast->codec->sample_rate = get_le32(pb);
ast->codec->bits_per_coded_sample = get_le32(pb);
ast->codec->channels = get_le32(pb);
ast->codec->codec_id =
wav_codec_get_id(ast->codec->codec_tag,
ast->codec->bits_per_coded_sample);
ast->need_parsing = AVSTREAM_PARSE_FULL;
} else
url_fskip(pb, 4 * 4);
size -= 6 * 4;
url_fskip(pb, size);
return 1;
case NUV_SEEKP:
size = 11;
break;
default:
url_fskip(pb, 7);
size = PKTSIZE(get_le32(pb));
break;
}
url_fskip(pb, size);
}
return 0;
}
static int nuv_header(AVFormatContext *s, AVFormatParameters *ap) {
NUVContext *ctx = s->priv_data;
ByteIOContext *pb = s->pb;
char id_string[12], version_string[5];
double aspect, fps;
int is_mythtv, width, height, v_packs, a_packs;
int stream_nr = 0;
AVStream *vst = NULL, *ast = NULL;
get_buffer(pb, id_string, 12);
is_mythtv = !memcmp(id_string, "MythTVVideo", 12);
get_buffer(pb, version_string, 5);
url_fskip(pb, 3); // padding
width = get_le32(pb);
height = get_le32(pb);
get_le32(pb); // unused, "desiredwidth"
get_le32(pb); // unused, "desiredheight"
get_byte(pb); // 'P' == progressive, 'I' == interlaced
url_fskip(pb, 3); // padding
aspect = av_int2dbl(get_le64(pb));
if (aspect > 0.9999 && aspect < 1.0001)
aspect = 4.0 / 3.0;
fps = av_int2dbl(get_le64(pb));
// number of packets per stream type, -1 means unknown, e.g. streaming
v_packs = get_le32(pb);
a_packs = get_le32(pb);
get_le32(pb); // text
get_le32(pb); // keyframe distance (?)
if (v_packs) {
ctx->v_id = stream_nr++;
vst = av_new_stream(s, ctx->v_id);
if (!vst)
return AVERROR(ENOMEM);
vst->codec->codec_type = CODEC_TYPE_VIDEO;
vst->codec->codec_id = CODEC_ID_NUV;
vst->codec->width = width;
vst->codec->height = height;
vst->codec->bits_per_coded_sample = 10;
vst->sample_aspect_ratio = av_d2q(aspect * height / width, 10000);
vst->r_frame_rate = av_d2q(fps, 60000);
av_set_pts_info(vst, 32, 1, 1000);
} else
ctx->v_id = -1;
if (a_packs) {
ctx->a_id = stream_nr++;
ast = av_new_stream(s, ctx->a_id);
if (!ast)
return AVERROR(ENOMEM);
ast->codec->codec_type = CODEC_TYPE_AUDIO;
ast->codec->codec_id = CODEC_ID_PCM_S16LE;
ast->codec->channels = 2;
ast->codec->sample_rate = 44100;
ast->codec->bit_rate = 2 * 2 * 44100 * 8;
ast->codec->block_align = 2 * 2;
ast->codec->bits_per_coded_sample = 16;
av_set_pts_info(ast, 32, 1, 1000);
} else
ctx->a_id = -1;
get_codec_data(pb, vst, ast, is_mythtv);
ctx->rtjpg_video = vst && vst->codec->codec_id == CODEC_ID_NUV;
return 0;
}
#define HDRSIZE 12
static int nuv_packet(AVFormatContext *s, AVPacket *pkt) {
NUVContext *ctx = s->priv_data;
ByteIOContext *pb = s->pb;
uint8_t hdr[HDRSIZE];
nuv_frametype frametype;
int ret, size;
while (!url_feof(pb)) {
int copyhdrsize = ctx->rtjpg_video ? HDRSIZE : 0;
uint64_t pos = url_ftell(pb);
ret = get_buffer(pb, hdr, HDRSIZE);
if (ret <= 0)
return ret ? ret : -1;
frametype = hdr[0];
size = PKTSIZE(AV_RL32(&hdr[8]));
switch (frametype) {
case NUV_EXTRADATA:
if (!ctx->rtjpg_video) {
url_fskip(pb, size);
break;
}
case NUV_VIDEO:
if (ctx->v_id < 0) {
av_log(s, AV_LOG_ERROR, "Video packet in file without video stream!\n");
url_fskip(pb, size);
break;
}
ret = av_new_packet(pkt, copyhdrsize + size);
if (ret < 0)
return ret;
// HACK: we have no idea if it is a keyframe,
// but if we mark none seeking will not work at all.
pkt->flags |= PKT_FLAG_KEY;
pkt->pos = pos;
pkt->pts = AV_RL32(&hdr[4]);
pkt->stream_index = ctx->v_id;
memcpy(pkt->data, hdr, copyhdrsize);
ret = get_buffer(pb, pkt->data + copyhdrsize, size);
return ret;
case NUV_AUDIO:
if (ctx->a_id < 0) {
av_log(s, AV_LOG_ERROR, "Audio packet in file without audio stream!\n");
url_fskip(pb, size);
break;
}
ret = av_get_packet(pb, pkt, size);
pkt->flags |= PKT_FLAG_KEY;
pkt->pos = pos;
pkt->pts = AV_RL32(&hdr[4]);
pkt->stream_index = ctx->a_id;
return ret;
case NUV_SEEKP:
// contains no data, size value is invalid
break;
default:
url_fskip(pb, size);
break;
}
}
return AVERROR(EIO);
}
AVInputFormat nuv_demuxer = {
"nuv",
NULL_IF_CONFIG_SMALL("NuppelVideo format"),
sizeof(NUVContext),
nuv_probe,
nuv_header,
nuv_packet,
NULL,
NULL,
};
|
