summaryrefslogtreecommitdiffstats
path: root/libmpcodecs/ad_libvorbis.c
blob: a768095187e4a14e26880c42fe0b71d04a59f960 (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
346
347
348
349
350
/*
 * This file is part of MPlayer.
 *
 * MPlayer is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * MPlayer 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with MPlayer; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

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

#include "config.h"
#include "ad_internal.h"
#include "libaf/reorder_ch.h"

static const ad_info_t info =
{
	"Ogg/Vorbis audio decoder",
#ifdef CONFIG_TREMOR
	"tremor",
#else
	"libvorbis",
#endif
	"Felix Buenemann, A'rpi",
	"libvorbis",
	""
};

LIBAD_EXTERN(libvorbis)

#ifdef CONFIG_TREMOR
#include <tremor/ivorbiscodec.h>
#else
#include <vorbis/codec.h>
#endif

// This struct is also defined in demux_ogg.c => common header ?
typedef struct ov_struct_st {
  vorbis_info      vi; /* struct that stores all the static vorbis bitstream
			  settings */
  vorbis_comment   vc; /* struct that stores all the bitstream user comments */
  vorbis_dsp_state vd; /* central working state for the packet->PCM decoder */
  vorbis_block     vb; /* local working space for packet->PCM decode */
  float            rg_scale; /* replaygain scale */
#ifdef CONFIG_TREMOR
  int              rg_scale_int;
#endif
} ov_struct_t;

static int read_vorbis_comment( char* ptr, const char* comment, const char* format, ... ) {
  va_list va;
  int clen, ret;

  va_start( va, format );
  clen = strlen( comment );
  ret = strncasecmp( ptr, comment, clen) == 0 ? vsscanf( ptr+clen, format, va ) : 0;
  va_end( va );

  return ret;
}

static int preinit(sh_audio_t *sh)
{
  sh->audio_out_minsize=1024*4; // 1024 samples/frame
  return 1;
}

static int init(sh_audio_t *sh)
{
  unsigned int offset, i, length, hsizes[3];
  void *headers[3];
  unsigned char* extradata;
  ogg_packet op;
  vorbis_comment vc;
  struct ov_struct_st *ov;
#define ERROR() { \
    vorbis_comment_clear(&vc); \
    vorbis_info_clear(&ov->vi); \
    free(ov); \
    return 0; \
  }

  /// Init the decoder with the 3 header packets
  ov = malloc(sizeof(struct ov_struct_st));
  vorbis_info_init(&ov->vi);
  vorbis_comment_init(&vc);

  if(! sh->wf) {
    mp_msg(MSGT_DECAUDIO,MSGL_ERR,"ad_vorbis, extradata seems to be absent! exit\n");
    ERROR();
  }

  if(! sh->wf->cbSize) {
    mp_msg(MSGT_DECAUDIO,MSGL_ERR,"ad_vorbis, extradata seems to be absent!, exit\n");
    ERROR();
  }

  mp_msg(MSGT_DECAUDIO,MSGL_V,"ad_vorbis, extradata seems is %d bytes long\n", sh->wf->cbSize);
  extradata = (char*) (sh->wf+1);
  if(!extradata) {
    mp_msg(MSGT_DECAUDIO,MSGL_ERR,"ad_vorbis, extradata seems to be NULL!, exit\n");
    ERROR();
  }

  if(*extradata != 2) {
    mp_msg (MSGT_DEMUX, MSGL_WARN, "ad_vorbis: Vorbis track does not contain valid headers.\n");
    ERROR();
  }

  offset = 1;
  for (i=0; i < 2; i++) {
    length = 0;
    while ((extradata[offset] == (unsigned char) 0xFF) && length < sh->wf->cbSize) {
      length += 255;
      offset++;
    }
    if(offset >= (sh->wf->cbSize - 1)) {
      mp_msg (MSGT_DEMUX, MSGL_WARN, "ad_vorbis: Vorbis track does not contain valid headers.\n");
      ERROR();
    }
    length += extradata[offset];
    offset++;
    mp_msg (MSGT_DEMUX, MSGL_V, "ad_vorbis, offset: %u, length: %u\n", offset, length);
    hsizes[i] = length;
  }

  headers[0] = &extradata[offset];
  headers[1] = &extradata[offset + hsizes[0]];
  headers[2] = &extradata[offset + hsizes[0] + hsizes[1]];
  hsizes[2] = sh->wf->cbSize - offset - hsizes[0] - hsizes[1];
  mp_msg (MSGT_DEMUX, MSGL_V, "ad_vorbis, header sizes: %d %d %d\n", hsizes[0], hsizes[1], hsizes[2]);

  for(i=0; i<3; i++) {
    op.bytes = hsizes[i];
    op.packet = headers[i];
    op.b_o_s  = (i == 0);
    if(vorbis_synthesis_headerin(&ov->vi,&vc,&op) <0) {
      mp_msg(MSGT_DECAUDIO,MSGL_ERR,"OggVorbis: header n. %d broken! len=%ld\n", i, op.bytes);
      ERROR();
    }
    if(i == 2) {
      float rg_gain=0.f, rg_peak=0.f;
    char **ptr=vc.user_comments;
    while(*ptr){
      mp_msg(MSGT_DECAUDIO,MSGL_V,"OggVorbisComment: %s\n",*ptr);
      /* replaygain */
      read_vorbis_comment( *ptr, "replaygain_album_gain=", "%f", &rg_gain );
      read_vorbis_comment( *ptr, "rg_audiophile=", "%f", &rg_gain );
      if( !rg_gain ) {
	read_vorbis_comment( *ptr, "replaygain_track_gain=", "%f", &rg_gain );
	read_vorbis_comment( *ptr, "rg_radio=", "%f", &rg_gain );
      }
      read_vorbis_comment( *ptr, "replaygain_album_peak=", "%f", &rg_peak );
      if( !rg_peak ) {
	read_vorbis_comment( *ptr, "replaygain_track_peak=", "%f", &rg_peak );
	read_vorbis_comment( *ptr, "rg_peak=", "%f", &rg_peak );
      }
      ++ptr;
    }
    /* replaygain: scale */
    if(!rg_gain)
      ov->rg_scale = 1.f; /* just in case pow() isn't standard-conformant */
    else
      ov->rg_scale = pow(10.f, rg_gain/20);
    /* replaygain: anticlip */
    if(ov->rg_scale * rg_peak > 1.f)
      ov->rg_scale = 1.f / rg_peak;
    /* replaygain: security */
    if(ov->rg_scale > 15.)
      ov->rg_scale = 15.;
#ifdef CONFIG_TREMOR
    ov->rg_scale_int = (int)(ov->rg_scale*64.f);
#endif
    mp_msg(MSGT_DECAUDIO,MSGL_V,"OggVorbis: Bitstream is %d channel%s, %dHz, %dbit/s %cBR\n",(int)ov->vi.channels,ov->vi.channels>1?"s":"",(int)ov->vi.rate,(int)ov->vi.bitrate_nominal,
	(ov->vi.bitrate_lower!=ov->vi.bitrate_nominal)||(ov->vi.bitrate_upper!=ov->vi.bitrate_nominal)?'V':'C');
    if(rg_gain || rg_peak)
      mp_msg(MSGT_DECAUDIO,MSGL_V,"OggVorbis: Gain = %+.2f dB, Peak = %.4f, Scale = %.2f\n", rg_gain, rg_peak, ov->rg_scale);
    mp_msg(MSGT_DECAUDIO,MSGL_V,"OggVorbis: Encoded by: %s\n",vc.vendor);
    }
  }

  vorbis_comment_clear(&vc);

//  printf("lower=%d  upper=%d  \n",(int)ov->vi.bitrate_lower,(int)ov->vi.bitrate_upper);

  // Setup the decoder
  sh->channels=ov->vi.channels;
  sh->samplerate=ov->vi.rate;
  sh->samplesize=2;
  // assume 128kbit if bitrate not specified in the header
  sh->i_bps=((ov->vi.bitrate_nominal>0) ? ov->vi.bitrate_nominal : 128000)/8;
  sh->context = ov;

  /// Finish the decoder init
  vorbis_synthesis_init(&ov->vd,&ov->vi);
  vorbis_block_init(&ov->vd,&ov->vb);
  mp_msg(MSGT_DECAUDIO,MSGL_V,"OggVorbis: Init OK!\n");

  return 1;
}

static void uninit(sh_audio_t *sh)
{
  struct ov_struct_st *ov = sh->context;
  vorbis_dsp_clear(&ov->vd);
  vorbis_block_clear(&ov->vb);
  vorbis_info_clear(&ov->vi);
  free(ov);
}

static int control(sh_audio_t *sh,int cmd,void* arg, ...)
{
    switch(cmd)
    {
#if 0
      case ADCTRL_RESYNC_STREAM:
	  return CONTROL_TRUE;
      case ADCTRL_SKIP_FRAME:
	  return CONTROL_TRUE;
#endif
    }
  return CONTROL_UNKNOWN;
}

static int decode_audio(sh_audio_t *sh,unsigned char *buf,int minlen,int maxlen)
{
        int len = 0;
        int samples;
#ifdef CONFIG_TREMOR
        ogg_int32_t **pcm;
#else
        float scale;
        float **pcm;
#endif
        struct ov_struct_st *ov = sh->context;
	while(len < minlen) {
	  while((samples=vorbis_synthesis_pcmout(&ov->vd,&pcm))<=0){
	    ogg_packet op;
	    double pts;
	    memset(&op,0,sizeof(op)); //op.b_o_s = op.e_o_s = 0;
	    op.bytes = ds_get_packet_pts(sh->ds,&op.packet, &pts);
	    if(op.bytes<=0) break;
	    if (pts != MP_NOPTS_VALUE) {
		sh->pts = pts;
		sh->pts_bytes = 0;
	    }
	    if(vorbis_synthesis(&ov->vb,&op)==0) /* test for success! */
	      vorbis_synthesis_blockin(&ov->vd,&ov->vb);
	  }
	  if(samples<=0) break; // error/EOF
	  while(samples>0){
	    int i,j;
	    int clipflag=0;
	    int convsize=(maxlen-len)/(2*ov->vi.channels); // max size!
	    int bout=((samples<convsize)?samples:convsize);

	    if(bout<=0) break; // no buffer space

	    /* convert floats to 16 bit signed ints (host order) and
	       interleave */
#ifdef CONFIG_TREMOR
           if (ov->rg_scale_int == 64) {
	    for(i=0;i<ov->vi.channels;i++){
	      ogg_int16_t *convbuffer=(ogg_int16_t *)(&buf[len]);
	      ogg_int16_t *ptr=convbuffer+i;
	      ogg_int32_t  *mono=pcm[i];
	      for(j=0;j<bout;j++){
		int val=mono[j]>>9;
		/* might as well guard against clipping */
		if(val>32767){
		  val=32767;
		  clipflag=1;
		}
		if(val<-32768){
		  val=-32768;
		  clipflag=1;
		}
		*ptr=val;
		ptr+=ov->vi.channels;
	      }
	    }
	   } else
#endif /* CONFIG_TREMOR */
	   {
#ifndef CONFIG_TREMOR
            scale = 32767.f * ov->rg_scale;
#endif
	    for(i=0;i<ov->vi.channels;i++){
	      ogg_int16_t *convbuffer=(ogg_int16_t *)(&buf[len]);
	      ogg_int16_t *ptr=convbuffer+i;
#ifdef CONFIG_TREMOR
	      ogg_int32_t  *mono=pcm[i];
	      for(j=0;j<bout;j++){
		int val=(mono[j]*ov->rg_scale_int)>>(9+6);
#else
	      float  *mono=pcm[i];
	      for(j=0;j<bout;j++){
		int val=mono[j]*scale;
		/* might as well guard against clipping */
		if(val>32767){
		  val=32767;
		  clipflag=1;
		}
		if(val<-32768){
		  val=-32768;
		  clipflag=1;
		}
#endif /* CONFIG_TREMOR */
		*ptr=val;
		ptr+=ov->vi.channels;
	      }
	    }
	   }

	    if(clipflag)
	      mp_msg(MSGT_DECAUDIO,MSGL_DBG2,"Clipping in frame %ld\n",(long)(ov->vd.sequence));
	    len+=2*ov->vi.channels*bout;
	    sh->pts_bytes += 2*ov->vi.channels*bout;
	    mp_msg(MSGT_DECAUDIO,MSGL_DBG2,"\n[decoded: %d / %d ]\n",bout,samples);
	    samples-=bout;
	    vorbis_synthesis_read(&ov->vd,bout); /* tell libvorbis how
						    many samples we
						    actually consumed */
	  } //while(samples>0)
//          if (!samples) break; // why? how?
	}

	if (len > 0 && ov->vi.channels >= 5) {
	  reorder_channel_nch(buf, AF_CHANNEL_LAYOUT_VORBIS_DEFAULT,
	                      AF_CHANNEL_LAYOUT_MPLAYER_DEFAULT,
	                      ov->vi.channels, len / sh->samplesize,
	                      sh->samplesize);
	}


  return len;
}