aboutsummaryrefslogtreecommitdiffhomepage
path: root/libmpcodecs/ad_liba52.c
blob: 0cc282776dc13c73cb2a03507f2ea2ce7256e98a (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
/*
 * 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.
 */

#define _XOPEN_SOURCE 600
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <math.h>
#include <assert.h>

#include "config.h"
#include "options.h"
#include "mp_msg.h"
#include "mpbswap.h"

#include "ad_internal.h"

#include "cpudetect.h"

#include "libaf/af_format.h"

#include <a52dec/a52.h>
#include <a52dec/mm_accel.h>
int (* a52_resample) (float * _f, int16_t * s16);

static a52_state_t *a52_state;
static uint32_t a52_flags=0;
/** Used by a52_resample_float, it defines the mapping between liba52
 * channels and output channels.  The ith nibble from the right in the
 * hex representation of channel_map is the index of the source
 * channel corresponding to the ith output channel.  Source channels are
 * indexed 1-6.  Silent output channels are marked by 0xf. */
static uint32_t channel_map;

#define DRC_NO_ACTION      0
#define DRC_NO_COMPRESSION 1
#define DRC_CALLBACK       2

/** The output is multiplied by this var.  Used for volume control */
static sample_t a52_level = 1;
static int a52_drc_action = DRC_NO_ACTION;

static const ad_info_t info =
{
	"AC3 decoding with liba52",
	"liba52",
	"Nick Kurshev",
	"Michel LESPINASSE",
	""
};

LIBAD_EXTERN(liba52)

static int a52_fillbuff(sh_audio_t *sh_audio)
{
int length=0;
int flags=0;
int sample_rate=0;
int bit_rate=0;

    sh_audio->a_in_buffer_len=0;
    /* sync frame:*/
while(1){
    while(sh_audio->a_in_buffer_len<8){
	int c=demux_getc(sh_audio->ds);
	if(c<0) return -1; /* EOF*/
        sh_audio->a_in_buffer[sh_audio->a_in_buffer_len++]=c;
    }
    if(sh_audio->format!=0x2000) swab(sh_audio->a_in_buffer,sh_audio->a_in_buffer,8);
    length = a52_syncinfo (sh_audio->a_in_buffer, &flags, &sample_rate, &bit_rate);
    if(length>=7 && length<=3840) break; /* we're done.*/
    /* bad file => resync*/
    if(sh_audio->format!=0x2000) swab(sh_audio->a_in_buffer,sh_audio->a_in_buffer,8);
    memmove(sh_audio->a_in_buffer,sh_audio->a_in_buffer+1,7);
    --sh_audio->a_in_buffer_len;
}
    mp_msg(MSGT_DECAUDIO,MSGL_DBG2,"a52: len=%d  flags=0x%X  %d Hz %d bit/s\n",length,flags,sample_rate,bit_rate);
    sh_audio->samplerate=sample_rate;
    sh_audio->i_bps=bit_rate/8;
    sh_audio->samplesize=sh_audio->sample_format==AF_FORMAT_FLOAT_NE ? 4 : 2;
    demux_read_data(sh_audio->ds,sh_audio->a_in_buffer+8,length-8);
    if(sh_audio->format!=0x2000)
	swab(sh_audio->a_in_buffer+8,sh_audio->a_in_buffer+8,length-8);

#ifdef CONFIG_LIBA52_INTERNAL
    if(crc16_block(sh_audio->a_in_buffer+2,length-2)!=0)
	mp_msg(MSGT_DECAUDIO,MSGL_STATUS,"a52: CRC check failed!  \n");
#endif

    return length;
}

/* returns: number of available channels*/
static int a52_printinfo(sh_audio_t *sh_audio){
int flags, sample_rate, bit_rate;
char* mode="unknown";
int channels=0;
  a52_syncinfo (sh_audio->a_in_buffer, &flags, &sample_rate, &bit_rate);
  switch(flags&A52_CHANNEL_MASK){
    case A52_CHANNEL: mode="channel"; channels=2; break;
    case A52_MONO: mode="mono"; channels=1; break;
    case A52_STEREO: mode="stereo"; channels=2; break;
    case A52_3F: mode="3f";channels=3;break;
    case A52_2F1R: mode="2f+1r";channels=3;break;
    case A52_3F1R: mode="3f+1r";channels=4;break;
    case A52_2F2R: mode="2f+2r";channels=4;break;
    case A52_3F2R: mode="3f+2r";channels=5;break;
    case A52_CHANNEL1: mode="channel1"; channels=2; break;
    case A52_CHANNEL2: mode="channel2"; channels=2; break;
    case A52_DOLBY: mode="dolby"; channels=2; break;
  }
  mp_msg(MSGT_DECAUDIO,MSGL_V,"AC3: %d.%d (%s%s)  %d Hz  %3.1f kbit/s\n",
	channels, (flags&A52_LFE)?1:0,
	mode, (flags&A52_LFE)?"+lfe":"",
	sample_rate, bit_rate*0.001f);
  return (flags&A52_LFE) ? (channels+1) : channels;
}

static sample_t dynrng_call (sample_t c, void *data)
{
    struct MPOpts *opts = data;
    //fprintf(stderr, "(%lf, %lf): %lf\n", (double)c, opts->drc_level, pow(c, opts->drc_level));
    return pow(c, opts->drc_level);
}


static int preinit(sh_audio_t *sh)
{
  /* Dolby AC3 audio: */
  /* however many channels, 2 bytes in a word, 256 samples in a block, 6 blocks in a frame */
  if (sh->samplesize < 4) sh->samplesize = 4;
  sh->audio_out_minsize=audio_output_channels*sh->samplesize*256*6;
  sh->audio_in_minsize=3840;
  a52_level = 1.0;
  return 1;
}

/**
 * \brief Function to convert the "planar" float format used by liba52
 * into the interleaved float format used by libaf/libao2.
 * \param in the input buffer containing the planar samples.
 * \param out the output buffer where the interleaved result is stored.
 */
static int a52_resample_float(float *in, int16_t *out)
{
    unsigned long i;
    float *p = (float*) out;
    for (i = 0; i != 256; i++) {
	unsigned long map = channel_map;
	do {
	    unsigned long ch = map & 15;
	    if (ch == 15)
		*p = 0;
	    else
		*p = in[i + ((ch-1)<<8)];
	    p++;
	} while ((map >>= 4));
    }
    return (int16_t*) p - out;
}

static int init(sh_audio_t *sh_audio)
{
    struct MPOpts *opts = sh_audio->opts;
  uint32_t a52_accel=0;
  sample_t level=a52_level, bias=384;
  int flags=0;
  /* Dolby AC3 audio:*/
#ifdef MM_ACCEL_X86_SSE
  if(gCpuCaps.hasSSE) a52_accel|=MM_ACCEL_X86_SSE;
#endif
  if(gCpuCaps.hasMMX) a52_accel|=MM_ACCEL_X86_MMX;
  if(gCpuCaps.hasMMX2) a52_accel|=MM_ACCEL_X86_MMXEXT;
  if(gCpuCaps.has3DNow) a52_accel|=MM_ACCEL_X86_3DNOW;
#ifdef MM_ACCEL_X86_3DNOWEXT
  if(gCpuCaps.has3DNowExt) a52_accel|=MM_ACCEL_X86_3DNOWEXT;
#endif
#ifdef MM_ACCEL_PPC_ALTIVEC
  if(gCpuCaps.hasAltiVec) a52_accel|=MM_ACCEL_PPC_ALTIVEC;
#endif
  a52_state=a52_init (a52_accel);
  if (a52_state == NULL) {
	mp_msg(MSGT_DECAUDIO,MSGL_ERR,"A52 init failed\n");
	return 0;
  }
  sh_audio->sample_format = AF_FORMAT_FLOAT_NE;
  if(a52_fillbuff(sh_audio)<0){
	mp_msg(MSGT_DECAUDIO,MSGL_ERR,"A52 sync failed\n");
	return 0;
  }

  /* Init a52 dynrng */
  if (opts->drc_level < 0.001) {
	  /* level == 0 --> no compression, init library without callback */
	  a52_drc_action = DRC_NO_COMPRESSION;
  } else if (opts->drc_level > 0.999 || opts->drc_level < 1.001) {
	  /* level == 1 --> full compression, do nothing at all (library default = full compression) */
	  a52_drc_action = DRC_NO_ACTION;
  } else {
	  a52_drc_action = DRC_CALLBACK;
  }
  /* Library init for dynrng has to be done for each frame, see decode_audio() */


  /* 'a52 cannot upmix' hotfix:*/
  a52_printinfo(sh_audio);
  sh_audio->channels=audio_output_channels;
while(sh_audio->channels>0){
  switch(sh_audio->channels){
	    case 1: a52_flags=A52_MONO; break;
/*	    case 2: a52_flags=A52_STEREO; break;*/
	    case 2: a52_flags=A52_DOLBY; break;
/*	    case 3: a52_flags=A52_3F; break;*/
	    case 3: a52_flags=A52_2F1R; break;
	    case 4: a52_flags=A52_2F2R; break; /* 2+2*/
	    case 5: a52_flags=A52_3F2R; break;
	    case 6: a52_flags=A52_3F2R|A52_LFE; break; /* 5.1*/
  }
  /* test:*/
  flags=a52_flags|A52_ADJUST_LEVEL;
  mp_msg(MSGT_DECAUDIO,MSGL_V,"A52 flags before a52_frame: 0x%X\n",flags);
  if (a52_frame (a52_state, sh_audio->a_in_buffer, &flags, &level, bias)){
    mp_msg(MSGT_DECAUDIO,MSGL_ERR,"a52: error decoding frame -> nosound\n");
    return 0;
  }
  mp_msg(MSGT_DECAUDIO,MSGL_V,"A52 flags after a52_frame: 0x%X\n",flags);
  /* frame decoded, let's init resampler:*/
  channel_map = 0;
  if (sh_audio->sample_format == AF_FORMAT_FLOAT_NE) {
      if (!(flags & A52_LFE)) {
	  switch ((flags<<3) | sh_audio->channels) {
	    case (A52_MONO    << 3) | 1: channel_map = 0x1; break;
	    case (A52_CHANNEL << 3) | 2:
	    case (A52_STEREO  << 3) | 2:
	    case (A52_DOLBY   << 3) | 2: channel_map =    0x21; break;
	    case (A52_2F1R    << 3) | 3: channel_map =   0x321; break;
	    case (A52_2F2R    << 3) | 4: channel_map =  0x4321; break;
	    case (A52_3F      << 3) | 5: channel_map = 0x2ff31; break;
	    case (A52_3F2R    << 3) | 5: channel_map = 0x25431; break;
	  }
      } else if (sh_audio->channels == 6) {
	  switch (flags & ~A52_LFE) {
	    case A52_MONO   : channel_map = 0x12ffff; break;
	    case A52_CHANNEL:
	    case A52_STEREO :
	    case A52_DOLBY  : channel_map = 0x1fff32; break;
	    case A52_3F     : channel_map = 0x13ff42; break;
	    case A52_2F1R   : channel_map = 0x1f4432; break;
	    case A52_2F2R   : channel_map = 0x1f5432; break;
	    case A52_3F2R   : channel_map = 0x136542; break;
	  }
      }
      if (channel_map) {
	  a52_resample = a52_resample_float;
	  break;
      }
  } else
  break;
}
  if(sh_audio->channels<=0){
    mp_msg(MSGT_DECAUDIO,MSGL_ERR,"a52: no resampler. try different channel setup!\n");
    return 0;
  }
  return 1;
}

static void uninit(sh_audio_t *sh)
{
  a52_free(a52_state);
}

static int control(sh_audio_t *sh,int cmd,void* arg, ...)
{
    switch(cmd)
    {
      case ADCTRL_RESYNC_STREAM:
      case ADCTRL_SKIP_FRAME:
	  a52_fillbuff(sh);
	  return CONTROL_TRUE;
      case ADCTRL_SET_VOLUME: {
	  float vol = *(float*)arg;
	  if (vol > 60.0) vol = 60.0;
	  a52_level = vol <= -200.0 ? 0 : pow(10.0,vol/20.0);
	  return CONTROL_TRUE;
      }
      case ADCTRL_QUERY_FORMAT:
	  if (*(int*)arg == AF_FORMAT_S16_NE ||
	      *(int*)arg == AF_FORMAT_FLOAT_NE)
	      return CONTROL_TRUE;
	  return CONTROL_FALSE;
    }
  return CONTROL_UNKNOWN;
}

static int decode_audio(sh_audio_t *sh_audio,unsigned char *buf,int minlen,int maxlen)
{
    sample_t level=a52_level, bias=384;
    int flags=a52_flags|A52_ADJUST_LEVEL;
    int i,len=-1;
	if (sh_audio->sample_format == AF_FORMAT_FLOAT_NE)
	    bias = 0;
	if(!sh_audio->a_in_buffer_len)
	    if(a52_fillbuff(sh_audio)<0) return len; /* EOF */
	sh_audio->a_in_buffer_len=0;
	if (a52_frame (a52_state, sh_audio->a_in_buffer, &flags, &level, bias)){
	    mp_msg(MSGT_DECAUDIO,MSGL_WARN,"a52: error decoding frame\n");
	    return len;
	}

	/* handle dynrng */
	if (a52_drc_action != DRC_NO_ACTION) {
	    if (a52_drc_action == DRC_NO_COMPRESSION)
		a52_dynrng(a52_state, NULL, NULL);
	    else
		a52_dynrng(a52_state, dynrng_call, sh_audio->opts);
	}

	len=0;
	for (i = 0; i < 6; i++) {
	    if (a52_block (a52_state)){
		mp_msg(MSGT_DECAUDIO,MSGL_WARN,"a52: error at resampling\n");
		break;
	    }
	    len+=2*a52_resample(a52_samples(a52_state),(int16_t *)&buf[len]);
	}
	assert(len <= maxlen);
  return len;
}