libmpcodecs/ad_liba52.c

   1 /*
   2  * This file is part of MPlayer.
   3  *
   4  * MPlayer is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * MPlayer is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along
  15  * with MPlayer; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  17  */
  18
  19 #define _XOPEN_SOURCE 600
  20 #include <stdio.h>
  21 #include <stdlib.h>
  22 #include <unistd.h>
  23 #include <math.h>
  24 #include <assert.h>
  25
  26 #include "config.h"
  27
  28 #include "mp_msg.h"
  29 #include "help_mp.h"
  30 #include "mpbswap.h"
  31
  32 #include "ad_internal.h"
  33
  34 #include "cpudetect.h"
  35
  36 #include "libaf/af_format.h"
  37
  38 #ifdef CONFIG_LIBA52_INTERNAL
  39 #include "liba52/a52.h"
  40 #include "liba52/mm_accel.h"
  41 #else
  42 #include <a52dec/a52.h>
  43 #include <a52dec/mm_accel.h>
  44 int (* a52_resample) (float * _f, int16_t * s16);
  45 #endif
  46
  47 static a52_state_t *a52_state;
  48 static uint32_t a52_flags=0;
  49 /** Used by a52_resample_float, it defines the mapping between liba52
  50  * channels and output channels.  The ith nibble from the right in the
  51  * hex representation of channel_map is the index of the source
  52  * channel corresponding to the ith output channel.  Source channels are
  53  * indexed 1-6.  Silent output channels are marked by 0xf. */
  54 static uint32_t channel_map;
  55
  56 #define DRC_NO_ACTION      0
  57 #define DRC_NO_COMPRESSION 1
  58 #define DRC_CALLBACK       2
  59
  60 /** The output is multiplied by this var.  Used for volume control */
  61 static sample_t a52_level = 1;
  62 /** The value of the -a52drc switch. */
  63 float a52_drc_level = 1.0;
  64 static int a52_drc_action = DRC_NO_ACTION;
  65
  66 static const ad_info_t info =
  67 {
  68         "AC3 decoding with liba52",
  69         "liba52",
  70         "Nick Kurshev",
  71         "Michel LESPINASSE",
  72         ""
  73 };
  74
  75 LIBAD_EXTERN(liba52)
  76
  77 static int a52_fillbuff(sh_audio_t *sh_audio)
  78 {
  79 int length=0;
  80 int flags=0;
  81 int sample_rate=0;
  82 int bit_rate=0;
  83
  84     sh_audio->a_in_buffer_len=0;
  85     /* sync frame:*/
  86 while(1){
  87     while(sh_audio->a_in_buffer_len<8){
  88         int c=demux_getc(sh_audio->ds);
  89         if(c<0) return -1; /* EOF*/
  90         sh_audio->a_in_buffer[sh_audio->a_in_buffer_len++]=c;
  91     }
  92     if(sh_audio->format!=0x2000) swab(sh_audio->a_in_buffer,sh_audio->a_in_buffer,8);
  93     length = a52_syncinfo (sh_audio->a_in_buffer, &flags, &sample_rate, &bit_rate);
  94     if(length>=7 && length<=3840) break; /* we're done.*/
  95     /* bad file => resync*/
  96     if(sh_audio->format!=0x2000) swab(sh_audio->a_in_buffer,sh_audio->a_in_buffer,8);
  97     memmove(sh_audio->a_in_buffer,sh_audio->a_in_buffer+1,7);
  98     --sh_audio->a_in_buffer_len;
  99 }
 100     mp_msg(MSGT_DECAUDIO,MSGL_DBG2,"a52: len=%d  flags=0x%X  %d Hz %d bit/s\n",length,flags,sample_rate,bit_rate);
 101     sh_audio->samplerate=sample_rate;
 102     sh_audio->i_bps=bit_rate/8;
 103     sh_audio->samplesize=sh_audio->sample_format==AF_FORMAT_FLOAT_NE ? 4 : 2;
 104     demux_read_data(sh_audio->ds,sh_audio->a_in_buffer+8,length-8);
 105     if(sh_audio->format!=0x2000)
 106         swab(sh_audio->a_in_buffer+8,sh_audio->a_in_buffer+8,length-8);
 107
 108 #ifdef CONFIG_LIBA52_INTERNAL
 109     if(crc16_block(sh_audio->a_in_buffer+2,length-2)!=0)
 110         mp_msg(MSGT_DECAUDIO,MSGL_STATUS,"a52: CRC check failed!  \n");
 111 #endif
 112
 113     return length;
 114 }
 115
 116 /* returns: number of available channels*/
 117 static int a52_printinfo(sh_audio_t *sh_audio){
 118 int flags, sample_rate, bit_rate;
 119 char* mode="unknown";
 120 int channels=0;
 121   a52_syncinfo (sh_audio->a_in_buffer, &flags, &sample_rate, &bit_rate);
 122   switch(flags&A52_CHANNEL_MASK){
 123     case A52_CHANNEL: mode="channel"; channels=2; break;
 124     case A52_MONO: mode="mono"; channels=1; break;
 125     case A52_STEREO: mode="stereo"; channels=2; break;
 126     case A52_3F: mode="3f";channels=3;break;
 127     case A52_2F1R: mode="2f+1r";channels=3;break;
 128     case A52_3F1R: mode="3f+1r";channels=4;break;
 129     case A52_2F2R: mode="2f+2r";channels=4;break;
 130     case A52_3F2R: mode="3f+2r";channels=5;break;
 131     case A52_CHANNEL1: mode="channel1"; channels=2; break;
 132     case A52_CHANNEL2: mode="channel2"; channels=2; break;
 133     case A52_DOLBY: mode="dolby"; channels=2; break;
 134   }
 135   mp_msg(MSGT_DECAUDIO,MSGL_V,"AC3: %d.%d (%s%s)  %d Hz  %3.1f kbit/s\n",
 136         channels, (flags&A52_LFE)?1:0,
 137         mode, (flags&A52_LFE)?"+lfe":"",
 138         sample_rate, bit_rate*0.001f);
 139   return (flags&A52_LFE) ? (channels+1) : channels;
 140 }
 141
 142 static sample_t dynrng_call (sample_t c, void *data)
 143 {
 144 //      fprintf(stderr, "(%lf, %lf): %lf\n", (double)c, (double)a52_drc_level, (double)pow((double)c, a52_drc_level));
 145         return pow((double)c, a52_drc_level);
 146 }
 147
 148
 149 static int preinit(sh_audio_t *sh)
 150 {
 151   /* Dolby AC3 audio: */
 152   /* however many channels, 2 bytes in a word, 256 samples in a block, 6 blocks in a frame */
 153 #ifdef CONFIG_LIBA52_INTERNAL
 154   if (sh->samplesize < 2) sh->samplesize = 2;
 155 #else
 156   if (sh->samplesize < 4) sh->samplesize = 4;
 157 #endif
 158   sh->audio_out_minsize=audio_output_channels*sh->samplesize*256*6;
 159   sh->audio_in_minsize=3840;
 160   a52_level = 1.0;
 161   return 1;
 162 }
 163
 164 /**
 165  * \brief Function to convert the "planar" float format used by liba52
 166  * into the interleaved float format used by libaf/libao2.
 167  * \param in the input buffer containing the planar samples.
 168  * \param out the output buffer where the interleaved result is stored.
 169  */
 170 static int a52_resample_float(float *in, int16_t *out)
 171 {
 172     unsigned long i;
 173     float *p = (float*) out;
 174     for (i = 0; i != 256; i++) {
 175         unsigned long map = channel_map;
 176         do {
 177             unsigned long ch = map & 15;
 178             if (ch == 15)
 179                 *p = 0;
 180             else
 181                 *p = in[i + ((ch-1)<<8)];
 182             p++;
 183         } while ((map >>= 4));
 184     }
 185     return (int16_t*) p - out;
 186 }
 187
 188 static int init(sh_audio_t *sh_audio)
 189 {
 190   uint32_t a52_accel=0;
 191   sample_t level=a52_level, bias=384;
 192   int flags=0;
 193   /* Dolby AC3 audio:*/
 194 #ifdef MM_ACCEL_X86_SSE
 195   if(gCpuCaps.hasSSE) a52_accel|=MM_ACCEL_X86_SSE;
 196 #endif
 197   if(gCpuCaps.hasMMX) a52_accel|=MM_ACCEL_X86_MMX;
 198   if(gCpuCaps.hasMMX2) a52_accel|=MM_ACCEL_X86_MMXEXT;
 199   if(gCpuCaps.has3DNow) a52_accel|=MM_ACCEL_X86_3DNOW;
 200 #ifdef MM_ACCEL_X86_3DNOWEXT
 201   if(gCpuCaps.has3DNowExt) a52_accel|=MM_ACCEL_X86_3DNOWEXT;
 202 #endif
 203 #ifdef MM_ACCEL_PPC_ALTIVEC
 204   if(gCpuCaps.hasAltiVec) a52_accel|=MM_ACCEL_PPC_ALTIVEC;
 205 #endif
 206   a52_state=a52_init (a52_accel);
 207   if (a52_state == NULL) {
 208         mp_msg(MSGT_DECAUDIO,MSGL_ERR,"A52 init failed\n");
 209         return 0;
 210   }
 211 #ifndef CONFIG_LIBA52_INTERNAL
 212   sh_audio->sample_format = AF_FORMAT_FLOAT_NE;
 213 #endif
 214   if(a52_fillbuff(sh_audio)<0){
 215         mp_msg(MSGT_DECAUDIO,MSGL_ERR,"A52 sync failed\n");
 216         return 0;
 217   }
 218
 219
 220   /* Init a52 dynrng */
 221   if (a52_drc_level < 0.001) {
 222           /* level == 0 --> no compression, init library without callback */
 223           a52_drc_action = DRC_NO_COMPRESSION;
 224   } else if (a52_drc_level > 0.999) {
 225           /* level == 1 --> full compression, do nothing at all (library default = full compression) */
 226           a52_drc_action = DRC_NO_ACTION;
 227   } else {
 228           a52_drc_action = DRC_CALLBACK;
 229   }
 230   /* Library init for dynrng has to be done for each frame, see decode_audio() */
 231
 232
 233   /* 'a52 cannot upmix' hotfix:*/
 234   a52_printinfo(sh_audio);
 235   sh_audio->channels=audio_output_channels;
 236 while(sh_audio->channels>0){
 237   switch(sh_audio->channels){
 238             case 1: a52_flags=A52_MONO; break;
 239 /*          case 2: a52_flags=A52_STEREO; break;*/
 240             case 2: a52_flags=A52_DOLBY; break;
 241 /*          case 3: a52_flags=A52_3F; break;*/
 242             case 3: a52_flags=A52_2F1R; break;
 243             case 4: a52_flags=A52_2F2R; break; /* 2+2*/
 244             case 5: a52_flags=A52_3F2R; break;
 245             case 6: a52_flags=A52_3F2R|A52_LFE; break; /* 5.1*/
 246   }
 247   /* test:*/
 248   flags=a52_flags|A52_ADJUST_LEVEL;
 249   mp_msg(MSGT_DECAUDIO,MSGL_V,"A52 flags before a52_frame: 0x%X\n",flags);
 250   if (a52_frame (a52_state, sh_audio->a_in_buffer, &flags, &level, bias)){
 251     mp_msg(MSGT_DECAUDIO,MSGL_ERR,"a52: error decoding frame -> nosound\n");
 252     return 0;
 253   }
 254   mp_msg(MSGT_DECAUDIO,MSGL_V,"A52 flags after a52_frame: 0x%X\n",flags);
 255   /* frame decoded, let's init resampler:*/
 256   channel_map = 0;
 257   if (sh_audio->sample_format == AF_FORMAT_FLOAT_NE) {
 258       if (!(flags & A52_LFE)) {
 259           switch ((flags<<3) | sh_audio->channels) {
 260             case (A52_MONO    << 3) | 1: channel_map = 0x1; break;
 261             case (A52_CHANNEL << 3) | 2:
 262             case (A52_STEREO  << 3) | 2:
 263             case (A52_DOLBY   << 3) | 2: channel_map =    0x21; break;
 264             case (A52_2F1R    << 3) | 3: channel_map =   0x321; break;
 265             case (A52_2F2R    << 3) | 4: channel_map =  0x4321; break;
 266             case (A52_3F      << 3) | 5: channel_map = 0x2ff31; break;
 267             case (A52_3F2R    << 3) | 5: channel_map = 0x25431; break;
 268           }
 269       } else if (sh_audio->channels == 6) {
 270           switch (flags & ~A52_LFE) {
 271             case A52_MONO   : channel_map = 0x12ffff; break;
 272             case A52_CHANNEL:
 273             case A52_STEREO :
 274             case A52_DOLBY  : channel_map = 0x1fff32; break;
 275             case A52_3F     : channel_map = 0x13ff42; break;
 276             case A52_2F1R   : channel_map = 0x1f4432; break;
 277             case A52_2F2R   : channel_map = 0x1f5432; break;
 278             case A52_3F2R   : channel_map = 0x136542; break;
 279           }
 280       }
 281       if (channel_map) {
 282           a52_resample = a52_resample_float;
 283           break;
 284       }
 285   } else
 286 #ifdef CONFIG_LIBA52_INTERNAL
 287   if(a52_resample_init(a52_accel,flags,sh_audio->channels)) break;
 288   --sh_audio->channels; /* try to decrease no. of channels*/
 289 #else
 290   break;
 291 #endif
 292 }
 293   if(sh_audio->channels<=0){
 294     mp_msg(MSGT_DECAUDIO,MSGL_ERR,"a52: no resampler. try different channel setup!\n");
 295     return 0;
 296   }
 297   return 1;
 298 }
 299
 300 static void uninit(sh_audio_t *sh)
 301 {
 302   a52_free(a52_state);
 303 }
 304
 305 static int control(sh_audio_t *sh,int cmd,void* arg, ...)
 306 {
 307     switch(cmd)
 308     {
 309       case ADCTRL_RESYNC_STREAM:
 310       case ADCTRL_SKIP_FRAME:
 311           a52_fillbuff(sh);
 312           return CONTROL_TRUE;
 313       case ADCTRL_SET_VOLUME: {
 314           float vol = *(float*)arg;
 315           if (vol > 60.0) vol = 60.0;
 316           a52_level = vol <= -200.0 ? 0 : pow(10.0,vol/20.0);
 317           return CONTROL_TRUE;
 318       }
 319       case ADCTRL_QUERY_FORMAT:
 320           if (*(int*)arg == AF_FORMAT_S16_NE ||
 321               *(int*)arg == AF_FORMAT_FLOAT_NE)
 322               return CONTROL_TRUE;
 323           return CONTROL_FALSE;
 324     }
 325   return CONTROL_UNKNOWN;
 326 }
 327
 328 static int decode_audio(sh_audio_t *sh_audio,unsigned char *buf,int minlen,int maxlen)
 329 {
 330     sample_t level=a52_level, bias=384;
 331     int flags=a52_flags|A52_ADJUST_LEVEL;
 332     int i,len=-1;
 333         if (sh_audio->sample_format == AF_FORMAT_FLOAT_NE)
 334             bias = 0;
 335         if(!sh_audio->a_in_buffer_len)
 336             if(a52_fillbuff(sh_audio)<0) return len; /* EOF */
 337         sh_audio->a_in_buffer_len=0;
 338         if (a52_frame (a52_state, sh_audio->a_in_buffer, &flags, &level, bias)){
 339             mp_msg(MSGT_DECAUDIO,MSGL_WARN,"a52: error decoding frame\n");
 340             return len;
 341         }
 342
 343         /* handle dynrng */
 344         if (a52_drc_action != DRC_NO_ACTION) {
 345             if (a52_drc_action == DRC_NO_COMPRESSION)
 346                 a52_dynrng(a52_state, NULL, NULL);
 347             else
 348                 a52_dynrng(a52_state, dynrng_call, NULL);
 349         }
 350
 351         len=0;
 352         for (i = 0; i < 6; i++) {
 353             if (a52_block (a52_state)){
 354                 mp_msg(MSGT_DECAUDIO,MSGL_WARN,"a52: error at resampling\n");
 355                 break;
 356             }
 357             len+=2*a52_resample(a52_samples(a52_state),(int16_t *)&buf[len]);
 358         }
 359         assert(len <= maxlen);
 360   return len;
 361 }