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
|
#include "config.h"
#include "../mp_msg.h"
#include <stdlib.h>
#include <stdio.h>
#include "stream.h"
#include "demuxer.h"
#include "stheader.h"
#include "genres.h"
#include "mp3_hdr.h"
#include <string.h>
#ifdef MP_DEBUG
#include <assert.h>
#endif
#define MP3 1
#define WAV 2
#define HDR_SIZE 4
typedef struct da_priv {
int frmt;
float last_pts;
} da_priv_t;
extern void free_sh_audio(sh_audio_t* sh);
extern void resync_audio_stream(sh_audio_t *sh_audio);
extern void print_wave_header(WAVEFORMATEX *h);
int hr_mp3_seek = 0;
int demux_audio_open(demuxer_t* demuxer) {
stream_t *s;
sh_audio_t* sh_audio;
uint8_t hdr[HDR_SIZE];
int st_pos = 0,frmt = 0, n = 0, pos = 0, step, mp3_freq,mp3_chans;
da_priv_t* priv;
#ifdef MP_DEBUG
assert(demuxer != NULL);
assert(demuxer->stream != NULL);
#endif
s = demuxer->stream;
while(n < 5 && ! s->eof) {
st_pos = stream_tell(s);
step = 1;
if(pos < HDR_SIZE) {
stream_read(s,&hdr[pos],HDR_SIZE-pos);
pos = HDR_SIZE;
}
if( hdr[0] == 'R' && hdr[1] == 'I' && hdr[2] == 'F' && hdr[3] == 'F' ) {
stream_skip(s,4);
if(s->eof)
break;
stream_read(s,hdr,4);
if(s->eof)
break;
if(hdr[0] != 'W' || hdr[1] != 'A' || hdr[2] != 'V' || hdr[3] != 'E' )
stream_skip(s,-8);
else
// We found wav header. Now we can have 'fmt ' or a mp3 header
// empty the buffer
step = 4;
} else if( hdr[0] == 'I' && hdr[1] == 'D' && hdr[2] == '3' && (hdr[3] >= 2)) {
int len;
stream_skip(s,2);
stream_read(s,hdr,4);
len = (hdr[0]<<21) | (hdr[1]<<14) | (hdr[2]<<7) | hdr[3];
stream_skip(s,len);
step = 4;
} else if( hdr[0] == 'f' && hdr[1] == 'm' && hdr[2] == 't' && hdr[3] == ' ' ) {
frmt = WAV;
break;
} else if((n = mp_get_mp3_header(hdr,&mp3_chans,&mp3_freq)) > 0) {
frmt = MP3;
break;
}
// Add here some other audio format detection
if(step < HDR_SIZE)
memmove(hdr,&hdr[step],HDR_SIZE-step);
pos -= step;
}
if(!frmt)
return 0;
sh_audio = new_sh_audio(demuxer,0);
switch(frmt) {
case MP3:
sh_audio->format = 0x55;
demuxer->movi_start = st_pos-HDR_SIZE+n;
sh_audio->audio.dwSampleSize= 0;
sh_audio->audio.dwScale = 1152;
sh_audio->audio.dwRate = mp3_freq;
sh_audio->wf = malloc(sizeof(WAVEFORMATEX));
sh_audio->wf->wFormatTag = sh_audio->format;
sh_audio->wf->nChannels = mp3_chans;
sh_audio->wf->nSamplesPerSec = mp3_freq;
sh_audio->wf->nBlockAlign = 1152;
sh_audio->wf->wBitsPerSample = 16;
sh_audio->wf->cbSize = 0;
for(n = 0; n < 5 ; n++) {
pos = mp_decode_mp3_header(hdr);
if(pos < 0)
return 0;
stream_skip(s,pos-4);
if(s->eof)
return 0;
stream_read(s,hdr,4);
if(s->eof)
return 0;
}
if(s->end_pos) {
char tag[4];
stream_seek(s,s->end_pos-128);
stream_read(s,tag,3);
tag[3] = '\0';
if(strcmp(tag,"TAG"))
demuxer->movi_end = s->end_pos;
else {
char buf[31];
uint8_t g;
demuxer->movi_end = stream_tell(s)-3;
stream_read(s,buf,30);
buf[30] = '\0';
demux_info_add(demuxer,"Title",buf);
stream_read(s,buf,30);
buf[30] = '\0';
demux_info_add(demuxer,"Artist",buf);
stream_read(s,buf,30);
buf[30] = '\0';
demux_info_add(demuxer,"Album",buf);
stream_read(s,buf,4);
buf[4] = '\0';
demux_info_add(demuxer,"Year",buf);
stream_read(s,buf,30);
buf[30] = '\0';
demux_info_add(demuxer,"Comment",buf);
if(buf[28] == 0 && buf[29] != 0) {
uint8_t trk = (uint8_t)buf[29];
sprintf(buf,"%d",trk);
demux_info_add(demuxer,"Track",buf);
}
g = stream_read_char(s);
demux_info_add(demuxer,"Genre",genres[g]);
}
}
break;
case WAV: {
unsigned int chunk_type;
unsigned int chunk_size;
WAVEFORMATEX* w;
int l;
sh_audio->wf = w = (WAVEFORMATEX*)malloc(sizeof(WAVEFORMATEX));
l = stream_read_dword_le(s);
if(l < 16) {
printf("Bad wav header length : too short !!!\n");
free_sh_audio(sh_audio);
return 0;
}
w->wFormatTag = sh_audio->format = stream_read_word_le(s);
w->nChannels = sh_audio->channels = stream_read_word_le(s);
w->nSamplesPerSec = sh_audio->samplerate = stream_read_dword_le(s);
w->nAvgBytesPerSec = stream_read_dword_le(s);
w->nBlockAlign = stream_read_word_le(s);
w->wBitsPerSample = sh_audio->samplesize = stream_read_word_le(s);
w->cbSize = 0;
l -= 16;
if(verbose>0) print_wave_header(w);
if(l)
stream_skip(s,l);
do
{
chunk_type = stream_read_fourcc(demuxer->stream);
chunk_size = stream_read_dword_le(demuxer->stream);
if (chunk_type != mmioFOURCC('d', 'a', 't', 'a'))
stream_skip(demuxer->stream, chunk_size);
} while (chunk_type != mmioFOURCC('d', 'a', 't', 'a'));
demuxer->movi_start = stream_tell(s);
demuxer->movi_end = s->end_pos;
// printf("wav: %X .. %X\n",(int)demuxer->movi_start,(int)demuxer->movi_end);
} break;
}
priv = (da_priv_t*)malloc(sizeof(da_priv_t));
priv->frmt = frmt;
priv->last_pts = -1;
demuxer->priv = priv;
demuxer->audio->id = 0;
demuxer->audio->sh = sh_audio;
sh_audio->ds = demuxer->audio;
if(stream_tell(s) != demuxer->movi_start)
stream_seek(s,demuxer->movi_start);
mp_msg(MSGT_DEMUX,MSGL_V,"demux_audio: audio data 0x%X - 0x%X \n",demuxer->movi_start,demuxer->movi_end);
return 1;
}
int demux_audio_fill_buffer(demux_stream_t *ds) {
sh_audio_t* sh_audio;
demuxer_t* demux;
da_priv_t* priv;
stream_t* s;
#ifdef MP_DEBUG
assert(ds != NULL);
assert(ds->sh != NULL);
assert(ds->demuxer != NULL);
#endif
sh_audio = ds->sh;
demux = ds->demuxer;
priv = demux->priv;
s = demux->stream;
if(s->eof || (demux->movi_end && stream_tell(s) >= demux->movi_end) )
return 0;
switch(priv->frmt) {
case MP3 :
while(! s->eof || (demux->movi_end && stream_tell(s) >= demux->movi_end) ) {
uint8_t hdr[4];
int len;
stream_read(s,hdr,4);
len = mp_decode_mp3_header(hdr);
if(len < 0) {
stream_skip(s,-3);
} else {
demux_packet_t* dp;
if(s->eof || (demux->movi_end && stream_tell(s) >= demux->movi_end) )
return 0;
dp = new_demux_packet(len);
memcpy(dp->buffer,hdr,4);
stream_read(s,dp->buffer + 4,len-4);
priv->last_pts = priv->last_pts < 0 ? 0 : priv->last_pts + 1152/(float)sh_audio->samplerate;
ds->pts = priv->last_pts - (ds_tell_pts(demux->audio)-sh_audio->a_in_buffer_len)/(float)sh_audio->i_bps;
ds_add_packet(ds,dp);
return 1;
}
} break;
case WAV : {
int l = sh_audio->wf->nAvgBytesPerSec;
demux_packet_t* dp = new_demux_packet(l);
stream_read(s,dp->buffer,l);
priv->last_pts = priv->last_pts < 0 ? 0 : priv->last_pts + l/(float)sh_audio->i_bps;
ds->pts = priv->last_pts - (ds_tell_pts(demux->audio)-sh_audio->a_in_buffer_len)/(float)sh_audio->i_bps;
ds_add_packet(ds,dp);
return 1;
}
default:
printf("Audio demuxer : unknown format %d\n",priv->frmt);
}
return 0;
}
static void high_res_mp3_seek(demuxer_t *demuxer,float time) {
uint8_t hdr[4];
int len,nf;
da_priv_t* priv = demuxer->priv;
sh_audio_t* sh = (sh_audio_t*)demuxer->audio->sh;
nf = time*sh->samplerate/1152;
while(nf > 0) {
stream_read(demuxer->stream,hdr,4);
len = mp_decode_mp3_header(hdr);
if(len < 0) {
stream_skip(demuxer->stream,-3);
continue;
}
stream_skip(demuxer->stream,len-4);
priv->last_pts += 1152/(float)sh->samplerate;
nf--;
}
}
void demux_audio_seek(demuxer_t *demuxer,float rel_seek_secs,int flags){
sh_audio_t* sh_audio;
stream_t* s;
int base,pos;
float len;
da_priv_t* priv;
if(!(sh_audio = demuxer->audio->sh))
return;
s = demuxer->stream;
priv = demuxer->priv;
if(priv->frmt == MP3 && hr_mp3_seek && !(flags & 2)) {
len = (flags & 1) ? rel_seek_secs - priv->last_pts : rel_seek_secs;
if(len < 0) {
stream_seek(s,demuxer->movi_start);
len = priv->last_pts + len;
priv->last_pts = 0;
}
if(len > 0)
high_res_mp3_seek(demuxer,len);
sh_audio->delay = priv->last_pts - (ds_tell_pts(demuxer->audio)-sh_audio->a_in_buffer_len)/(float)sh_audio->i_bps;
resync_audio_stream(sh_audio);
return;
}
base = flags&1 ? demuxer->movi_start : stream_tell(s);
if(flags&2)
pos = base + ((demuxer->movi_end - demuxer->movi_start)*rel_seek_secs);
else
pos = base + (rel_seek_secs*sh_audio->i_bps);
if(demuxer->movi_end && pos >= demuxer->movi_end) {
sh_audio->delay = (stream_tell(s) - demuxer->movi_start)/(float)sh_audio->i_bps;
return;
} else if(pos < demuxer->movi_start)
pos = demuxer->movi_start;
priv->last_pts = (pos-demuxer->movi_start)/(float)sh_audio->i_bps;
sh_audio->delay = priv->last_pts - (ds_tell_pts(demuxer->audio)-sh_audio->a_in_buffer_len)/(float)sh_audio->i_bps;
switch(priv->frmt) {
case WAV:
pos -= (pos % (sh_audio->channels * sh_audio->samplesize) );
// We need to decrease the pts by one step to make it the "last one"
priv->last_pts -= sh_audio->wf->nAvgBytesPerSec/(float)sh_audio->i_bps;
break;
}
stream_seek(s,pos);
resync_audio_stream(sh_audio);
}
void demux_close_audio(demuxer_t* demuxer) {
da_priv_t* priv = demuxer->priv;
if(!priv)
return;
free(priv);
}
|