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