aboutsummaryrefslogtreecommitdiffhomepage
path: root/libmpdemux/demux_nsv.c
blob: f1f401b5157e47c1a7556294be7a8a3d781d964c (plain)
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

/*
 * Nullsoft Streaming Video demuxer
 * for MPlayer
 * by Reza Jelveh <reza.jelveh@tuhh.de>
 * seeking and PCM audio not yet supported
 * PCM needs extra audio chunk "miniheader" parsing
 * Based on A'rpis G2 work
 * Licence: GPL
 */

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

#include "config.h"
#include "mp_msg.h"
#include "help_mp.h"
#include "stream.h"
#include "demuxer.h"
#include "stheader.h"

typedef struct {
    float   v_pts;  
    int video_pack_no;
    unsigned int a_format;
    unsigned int v_format;
    unsigned char fps;            
} nsv_priv_t;

#define HEADER_SEARCH_SIZE 256000


/**
 * Seeking still to be implemented
 */
static void demux_seek_nsv ( demuxer_t *demuxer, float rel_seek_secs, float audio_delay, int flags )
{
// seeking is not yet implemented
}


static int demux_nsv_fill_buffer ( demuxer_t *demuxer, demux_stream_t *ds )
{  
    unsigned char hdr[17];
    // for the extra data
    unsigned char aux[6];
    int i_aux = 0;
    // videolen = audio chunk length, audiolen = video chunk length
    int videolen,audiolen; 

    sh_video_t *sh_video = demuxer->video->sh;
    sh_audio_t *sh_audio = demuxer->audio->sh;

    nsv_priv_t * priv = demuxer->priv;

    // if the audio/video chunk has no new header the first 2 bytes will be discarded 0xBEEF 
    // or rather 0xEF 0xBE
    stream_read(demuxer->stream,hdr,7);
    if(stream_eof(demuxer->stream)) return 0;
    // sometimes instead of 0xBEEF as described for the next audio/video chunk we get
    // a whole new header
    
    mp_dbg(MSGT_DEMUX,MSGL_DBG2,"demux_nsv: %08X %08X\n",hdr[0]<<8|hdr[1],stream_tell(demuxer->stream));
    switch(hdr[0]<<8|hdr[1]) {
        case 0x4E53:
            if(hdr[2]==0x56 && hdr[3]==0x73){
                // NSVs
                // get the header since there is no more metaheader after the first one 
                // there is no more need to skip that
                stream_read(demuxer->stream,hdr+7,17-7);
                stream_read(demuxer->stream,hdr,7);
            }
            break;
        
        case 0xEFBE:
            break;

        default:
            mp_dbg(MSGT_DEMUX,MSGL_WARN,"demux_nsv: sync lost\n");
            break;
    }

    if (sh_video)
    sh_video->pts = priv->v_pts =demuxer->video->pts=  priv->video_pack_no *
         (float)sh_video->frametime;
    else
        priv->v_pts = priv->video_pack_no;

    demuxer->filepos=stream_tell(demuxer->stream);


    mp_dbg(MSGT_DEMUX,MSGL_DBG2,"demux_nsv: %08X: %02X %02X | %02X %02X %02X | %02X %02X  \n",
    (int)demuxer->filepos, hdr[0],hdr[1],hdr[2],hdr[3],hdr[4],hdr[5],hdr[6]);

    // read video:
    videolen=(hdr[2]>>4)|(hdr[3]<<4)|(hdr[4]<<0xC);
    //check if we got extra data like subtitles here
    if( (hdr[2]&0x0f) != 0x0 ) {
        stream_read( demuxer->stream, aux, 6); 

        i_aux = aux[0]|aux[1]<<8;
        // We skip this extra data 
        stream_skip( demuxer->stream, i_aux );
        i_aux+=6;
        videolen -= i_aux;
    }
    

    // we need to return an empty packet when the 
    // video frame is empty otherwise the stream will fasten up 
    if(sh_video) {
        if( (hdr[2]&0x0f) != 0x0 )
            ds_read_packet(demuxer->video,demuxer->stream,videolen,priv->v_pts,demuxer->filepos-i_aux,0);
        else 
            ds_read_packet(demuxer->video,demuxer->stream,videolen,priv->v_pts,demuxer->filepos,0);
    }
    else
        stream_skip(demuxer->stream,videolen);

    // read audio:
    audiolen=(hdr[5])|(hdr[6]<<8);
    // we need to return an empty packet when the 
    // audio frame is empty otherwise the stream will fasten up 
    if(sh_audio) {
        ds_read_packet(demuxer->audio,demuxer->stream,audiolen,priv->v_pts,demuxer->filepos+videolen,0);
    }
    else
        stream_skip(demuxer->stream,audiolen);

    ++priv->video_pack_no;

    return 1;
    
}


static demuxer_t* demux_open_nsv ( demuxer_t* demuxer )
{
    // last 2 bytes 17 and 18 are unknown but right after that comes the length
    unsigned char hdr[17];
    int videolen,audiolen;
    unsigned char buf[10];
    sh_video_t *sh_video = NULL;
    sh_audio_t *sh_audio = NULL;
    
    
    nsv_priv_t * priv = malloc(sizeof(nsv_priv_t));
    demuxer->priv=priv;
    priv->video_pack_no=0;

      /* disable seeking yet to be fixed*/
    demuxer->seekable = 0;
        
    stream_read(demuxer->stream,hdr,4);
    if(stream_eof(demuxer->stream)) return 0;
    
    if(hdr[0]==0x4E && hdr[1]==0x53 && hdr[2]==0x56){
        // NSV header!
        if(hdr[3]==0x73){
            // NSVs
            stream_read(demuxer->stream,hdr+4,17-4);            
        }

        if(hdr[3]==0x66){
            // NSVf
            int len=stream_read_dword_le(demuxer->stream);
            // TODO: parse out metadata!!!!
            stream_skip(demuxer->stream,len-8);
                
            // NSVs
            stream_read(demuxer->stream,hdr,17);        
        }

        // dummy debug message
        mp_msg(MSGT_DEMUX,MSGL_V,"demux_nsv: Header: %.12s\n",hdr);

        //   bytes 8-11   audio codec fourcc
        // PCM fourcc needs extra parsing for every audio chunk, yet to implement
        if((demuxer->audio->id != -2) && strncmp(hdr+8,"NONE", 4)){//&&strncmp(hdr+8,"VLB ", 4)){
            sh_audio = new_sh_audio ( demuxer, 0 );
            demuxer->audio->sh = sh_audio;
            sh_audio->format=mmioFOURCC(hdr[8],hdr[9],hdr[10],hdr[11]);
            sh_audio->ds = demuxer->audio;
            priv->a_format=mmioFOURCC(hdr[8],hdr[9],hdr[10],hdr[11]);
        }

        // store hdr fps 
        priv->fps=hdr[16];
            
        if ((demuxer->video->id != -2) && strncmp(hdr+4,"NONE", 4)) {
            /* Create a new video stream header */
            sh_video = new_sh_video ( demuxer, 0 );

            /* Make sure the demuxer knows about the new video stream header
             * (even though new_sh_video() ought to take care of it)
             */
            demuxer->video->sh = sh_video;

            /* Make sure that the video demuxer stream header knows about its
             * parent video demuxer stream (this is getting wacky), or else
             * video_read_properties() will choke
             */
            sh_video->ds = demuxer->video;
        
            //   bytes 4-7  video codec fourcc
            priv->v_format = sh_video->format=mmioFOURCC(hdr[4],hdr[5],hdr[6],hdr[7]);
        
            // new video stream! parse header
            sh_video->disp_w=hdr[12]|(hdr[13]<<8);
            sh_video->disp_h=hdr[14]|(hdr[15]<<8);
            sh_video->bih=calloc(1,sizeof(BITMAPINFOHEADER));
            sh_video->bih->biSize=sizeof(BITMAPINFOHEADER);
            sh_video->bih->biPlanes=1; 
            sh_video->bih->biBitCount=24;
            sh_video->bih->biWidth=hdr[12]|(hdr[13]<<8);
            sh_video->bih->biHeight=hdr[14]|(hdr[15]<<8);
            memcpy(&sh_video->bih->biCompression,hdr+4,4);
            sh_video->bih->biSizeImage=sh_video->bih->biWidth*sh_video->bih->biHeight*3;

            // here we search for the correct keyframe 
            // vp6 keyframe is when the 2nd byte of the vp6 header is
            // 0x36 for VP61 and 0x46 for VP62
            if((priv->v_format==mmioFOURCC('V','P','6','1')) ||
               (priv->v_format==mmioFOURCC('V','P','6','2')) ||
               (priv->v_format==mmioFOURCC('V','P','3','1'))) {
                stream_read(demuxer->stream,buf,10);
                if (((((priv->v_format>>16) & 0xff) == '6') && ((buf[8]&0x0e)!=0x06)) ||
                    ((((priv->v_format>>16) & 0xff) == '3') && (buf[8]!=0x00 || buf[9]!=0x08))) {
                    mp_msg(MSGT_DEMUX,MSGL_V,"demux_nsv: searching %.4s keyframe...\n", (char*)&priv->v_format);
                    while(((((priv->v_format>>16) & 0xff) == '6') && ((buf[8]&0x0e)!=0x06)) ||
                          ((((priv->v_format>>16) & 0xff) == '3') && (buf[8]!=0x00 || buf[9]!=0x08))){
                        mp_msg(MSGT_DEMUX,MSGL_DBG2,"demux_nsv: %.4s block skip.\n", (char*)&priv->v_format);
                        videolen=(buf[2]>>4)|(buf[3]<<4)|(buf[4]<<0xC);
                        audiolen=(buf[5])|(buf[6]<<8);
                        stream_skip(demuxer->stream, videolen+audiolen-3);
                        stream_read(demuxer->stream,buf,10);
                        if(stream_eof(demuxer->stream)) return 0;
                        if(buf[0]==0x4E){
                            mp_msg(MSGT_DEMUX,MSGL_DBG2,"demux_nsv: Got NSVs block.\n");
                            stream_skip(demuxer->stream,7);
                            stream_read(demuxer->stream,buf,10);
                        }
                    }
                }

                // data starts 10 bytes before current pos but later
                // we seek 17 backwards
                stream_skip(demuxer->stream,7);
            } 
            
        switch(priv->fps){
        case 0x80:
            sh_video->fps=30;
            break;
        case 0x81:
            sh_video->fps=(float)30000.0/1001.0;
            break;
        case 0x82:
            sh_video->fps=25;
            break;
        case 0x83:
            sh_video->fps=(float)24000.0/1001.0;
            break;
        case 0x85:
            sh_video->fps=(float)15000.0/1001.0;
            break;
        case 0x89:
            sh_video->fps=(float)10000.0/1001.0;
            break;
        default:
            sh_video->fps = (float)priv->fps;
        }       
        sh_video->frametime = (float)1.0 / (float)sh_video->fps;
       }
    }   

    // seek to start of NSV header
    stream_seek(demuxer->stream,stream_tell(demuxer->stream)-17);
    
    return demuxer;
}

static int nsv_check_file ( demuxer_t* demuxer )
{
    unsigned char hdr;
    int i;

    /* Store original position */
//  off_t orig_pos = stream_tell(demuxer->stream);

    mp_msg ( MSGT_DEMUX, MSGL_V, "Checking for Nullsoft Streaming Video\n" );
   
    for (i = 0; i < HEADER_SEARCH_SIZE; i++) {
        if (stream_read_char(demuxer->stream) != 'N')
            continue;
        if(stream_eof(demuxer->stream))
            return 0;

        if (stream_read_char(demuxer->stream) != 'S')
            continue;
        if(stream_eof(demuxer->stream))
            return 0;
        if (stream_read_char(demuxer->stream) != 'V')
            continue;
        if(stream_eof(demuxer->stream))
            return 0;

        hdr = stream_read_char(demuxer->stream);
        if(stream_eof(demuxer->stream)) 
            return 0;
        if((hdr == 'f') || (hdr == 's')) {
            stream_seek(demuxer->stream,stream_tell(demuxer->stream)-4);
            return DEMUXER_TYPE_NSV;
        }
    }

    return 0;
}

static void demux_close_nsv(demuxer_t* demuxer) {
    nsv_priv_t* priv = demuxer->priv;

    if(!priv)
        return;
    free(priv);

}


demuxer_desc_t demuxer_desc_nsv = {
  "NullsoftVideo demuxer",
  "nsv",
  "Nullsoft Streaming Video",
  "Reza Jelveh",
  "nsv and nsa streaming files",
  DEMUXER_TYPE_NSV,
  0, // safe but expensive autodetect
  nsv_check_file,
  demux_nsv_fill_buffer,
  demux_open_nsv,
  demux_close_nsv,
  demux_seek_nsv,
  NULL
};