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 int length=0;
  79 int flags=0;
  80 int sample_rate=0;
  81 int bit_rate=0;
  82
  83     sh_audio->a_in_buffer_len=0;
  84     /* sync frame:*/
  85 while(1){
  86     while(sh_audio->a_in_buffer_len<8){
  87         int c=demux_getc(sh_audio->ds);
  88         if(c<0) return -1; /* EOF*/
  89         sh_audio->a_in_buffer[sh_audio->a_in_buffer_len++]=c;
  90     }
  91     if(sh_audio->format!=0x2000) swab(sh_audio->a_in_buffer,sh_audio->a_in_buffer,8);
  92     length = a52_syncinfo (sh_audio->a_in_buffer, &flags, &sample_rate, &bit_rate);
  93     if(length>=7 && length<=3840) break; /* we're done.*/
  94     /* bad file => resync*/
  95     if(sh_audio->format!=0x2000) swab(sh_audio->a_in_buffer,sh_audio->a_in_buffer,8);
  96     memmove(sh_audio->a_in_buffer,sh_audio->a_in_buffer+1,7);
  97     --sh_audio->a_in_buffer_len;
  98 }
  99     mp_msg(MSGT_DECAUDIO,MSGL_DBG2,"a52: len=%d  flags=0x%X  %d Hz %d bit/s\n",length,flags,sample_rate,bit_rate);
 100     sh_audio->samplerate=sample_rate;
 101     sh_audio->i_bps=bit_rate/8;
 102     sh_audio->samplesize=sh_audio->sample_format==AF_FORMAT_FLOAT_NE ? 4 : 2;
 103     demux_read_data(sh_audio->ds,sh_audio->a_in_buffer+8,length-8);
 104     if(sh_audio->format!=0x2000)
 105         swab(sh_audio->a_in_buffer+8,sh_audio->a_in_buffer+8,length-8);
 106
 107 #ifdef CONFIG_LIBA52_INTERNAL
 108     if(crc16_block(sh_audio->a_in_buffer+2,length-2)!=0)
 109         mp_msg(MSGT_DECAUDIO,MSGL_STATUS,"a52: CRC check failed!  \n");
 110 #endif
 111
 112     return length;
 113 }
 114
 115 /* returns: number of available channels*/
 116 static int a52_printinfo(sh_audio_t *sh_audio){
 117 int flags, sample_rate, bit_rate;
 118 char* mode="unknown";
 119 int channels=0;
 120   a52_syncinfo (sh_audio->a_in_buffer, &flags, &sample_rate, &bit_rate);
 121   switch(flags&A52_CHANNEL_MASK){
 122     case A52_CHANNEL: mode="channel"; channels=2; break;
 123     case A52_MONO: mode="mono"; channels=1; break;
 124     case A52_STEREO: mode="stereo"; channels=2; break;
 125     case A52_3F: mode="3f";channels=3;break;
 126     case A52_2F1R: mode="2f+1r";channels=3;break;
 127     case A52_3F1R: mode="3f+1r";channels=4;break;
 128     case A52_2F2R: mode="2f+2r";channels=4;break;
 129     case A52_3F2R: mode="3f+2r";channels=5;break;
 130     case A52_CHANNEL1: mode="channel1"; channels=2; break;
 131     case A52_CHANNEL2: mode="channel2"; channels=2; break;
 132     case A52_DOLBY: mode="dolby"; channels=2; break;
 133   }
 134   mp_msg(MSGT_DECAUDIO,MSGL_V,"AC3: %d.%d (%s%s)  %d Hz  %3.1f kbit/s\n",
 135         channels, (flags&A52_LFE)?1:0,
 136         mode, (flags&A52_LFE)?"+lfe":"",
 137         sample_rate, bit_rate*0.001f);
 138   return (flags&A52_LFE) ? (channels+1) : channels;
 139 }
 140
 141 static sample_t dynrng_call (sample_t c, void *data) {
 142 //      fprintf(stderr, "(%lf, %lf): %lf\n", (double)c, (double)a52_drc_level, (double)pow((double)c, a52_drc_level));
 143         return pow((double)c, a52_drc_level);
 144 }
 145
 146
 147 static int preinit(sh_audio_t *sh)
 148 {
 149   /* Dolby AC3 audio: */
 150   /* however many channels, 2 bytes in a word, 256 samples in a block, 6 blocks in a frame */
 151 #ifdef CONFIG_LIBA52_INTERNAL
 152   if (sh->samplesize < 2) sh->samplesize = 2;
 153 #else
 154   if (sh->samplesize < 4) sh->samplesize = 4;
 155 #endif
 156   sh->audio_out_minsize=audio_output_channels*sh->samplesize*256*6;
 157   sh->audio_in_minsize=3840;
 158   a52_level = 1.0;
 159   return 1;
 160 }
 161
 162 /**
 163  * \brief Function to convert the "planar" float format used by liba52
 164  * into the interleaved float format used by libaf/libao2.
 165  * \param in the input buffer containing the planar samples.
 166  * \param out the output buffer where the interleaved result is stored.
 167  */
 168 static int a52_resample_float(float *in, int16_t *out)
 169 {
 170     unsigned long i;
 171     float *p = (float*) out;
 172     for (i = 0; i != 256; i++) {
 173         unsigned long map = channel_map;
 174         do {
 175             unsigned long ch = map & 15;
 176             if (ch == 15)
 177                 *p = 0;
 178             else
 179                 *p = in[i + ((ch-1)<<8)];
 180             p++;
 181         } while ((map >>= 4));
 182     }
 183     return (int16_t*) p - out;
 184 }
 185
 186 static int init(sh_audio_t *sh_audio)
 187 {
 188   uint32_t a52_accel=0;
 189   sample_t level=a52_level, bias=384;
 190   int flags=0;
 191   /* Dolby AC3 audio:*/
 192 #ifdef MM_ACCEL_X86_SSE
 193   if(gCpuCaps.hasSSE) a52_accel|=MM_ACCEL_X86_SSE;
 194 #endif
 195   if(gCpuCaps.hasMMX) a52_accel|=MM_ACCEL_X86_MMX;
 196   if(gCpuCaps.hasMMX2) a52_accel|=MM_ACCEL_X86_MMXEXT;
 197   if(gCpuCaps.has3DNow) a52_accel|=MM_ACCEL_X86_3DNOW;
 198 #ifdef MM_ACCEL_X86_3DNOWEXT
 199   if(gCpuCaps.has3DNowExt) a52_accel|=MM_ACCEL_X86_3DNOWEXT;
 200 #endif
 201 #ifdef MM_ACCEL_PPC_ALTIVEC
 202   if(gCpuCaps.hasAltiVec) a52_accel|=MM_ACCEL_PPC_ALTIVEC;
 203 #endif
 204   a52_state=a52_init (a52_accel);
 205   if (a52_state == NULL) {
 206         mp_msg(MSGT_DECAUDIO,MSGL_ERR,"A52 init failed\n");
 207         return 0;
 208   }
 209 #ifndef CONFIG_LIBA52_INTERNAL
 210   sh_audio->sample_format = AF_FORMAT_FLOAT_NE;
 211 #endif
 212   if(a52_fillbuff(sh_audio)<0){
 213         mp_msg(MSGT_DECAUDIO,MSGL_ERR,"A52 sync failed\n");
 214         return 0;
 215   }
 216
 217
 218   /* Init a52 dynrng */
 219   if (a52_drc_level < 0.001) {
 220           /* level == 0 --> no compression, init library without callback */
 221           a52_drc_action = DRC_NO_COMPRESSION;
 222   } else if (a52_drc_level > 0.999) {
 223           /* level == 1 --> full compression, do nothing at all (library default = full compression) */
 224           a52_drc_action = DRC_NO_ACTION;
 225   } else {
 226           a52_drc_action = DRC_CALLBACK;
 227   }
 228   /* Library init for dynrng has to be done for each frame, see decode_audio() */
 229
 230
 231   /* 'a52 cannot upmix' hotfix:*/
 232   a52_printinfo(sh_audio);
 233   sh_audio->channels=audio_output_channels;
 234 while(sh_audio->channels>0){
 235   switch(sh_audio->channels){
 236             case 1: a52_flags=A52_MONO; break;
 237 /*          case 2: a52_flags=A52_STEREO; break;*/
 238             case 2: a52_flags=A52_DOLBY; break;
 239 /*          case 3: a52_flags=A52_3F; break;*/
 240             case 3: a52_flags=A52_2F1R; break;
 241             case 4: a52_flags=A52_2F2R; break; /* 2+2*/
 242             case 5: a52_flags=A52_3F2R; break;
 243             case 6: a52_flags=A52_3F2R|A52_LFE; break; /* 5.1*/
 244   }
 245   /* test:*/
 246   flags=a52_flags|A52_ADJUST_LEVEL;
 247   mp_msg(MSGT_DECAUDIO,MSGL_V,"A52 flags before a52_frame: 0x%X\n",flags);
 248   if (a52_frame (a52_state, sh_audio->a_in_buffer, &flags, &level, bias)){
 249     mp_msg(MSGT_DECAUDIO,MSGL_ERR,"a52: error decoding frame -> nosound\n");
 250     return 0;
 251   }
 252   mp_msg(MSGT_DECAUDIO,MSGL_V,"A52 flags after a52_frame: 0x%X\n",flags);
 253   /* frame decoded, let's init resampler:*/
 254   channel_map = 0;
 255   if (sh_audio->sample_format == AF_FORMAT_FLOAT_NE) {
 256       if (!(flags & A52_LFE)) {
 257           switch ((flags<<3) | sh_audio->channels) {
 258             case (A52_MONO    << 3) | 1: channel_map = 0x1; break;
 259             case (A52_CHANNEL << 3) | 2:
 260             case (A52_STEREO  << 3) | 2:
 261             case (A52_DOLBY   << 3) | 2: channel_map =    0x21; break;
 262             case (A52_2F1R    << 3) | 3: channel_map =   0x321; break;
 263             case (A52_2F2R    << 3) | 4: channel_map =  0x4321; break;
 264             case (A52_3F      << 3) | 5: channel_map = 0x2ff31; break;
 265             case (A52_3F2R    << 3) | 5: channel_map = 0x25431; break;
 266           }
 267       } else if (sh_audio->channels == 6) {
 268           switch (flags & ~A52_LFE) {
 269             case A52_MONO   : channel_map = 0x12ffff; break;
 270             case A52_CHANNEL:
 271             case A52_STEREO :
 272             case A52_DOLBY  : channel_map = 0x1fff32; break;
 273             case A52_3F     : channel_map = 0x13ff42; break;
 274             case A52_2F1R   : channel_map = 0x1f4432; break;
 275             case A52_2F2R   : channel_map = 0x1f5432; break;
 276             case A52_3F2R   : channel_map = 0x136542; break;
 277           }
 278       }
 279       if (channel_map) {
 280           a52_resample = a52_resample_float;
 281           break;
 282       }
 283   } else
 284 #ifdef CONFIG_LIBA52_INTERNAL
 285   if(a52_resample_init(a52_accel,flags,sh_audio->channels)) break;
 286   --sh_audio->channels; /* try to decrease no. of channels*/
 287 #else
 288   break;
 289 #endif
 290 }
 291   if(sh_audio->channels<=0){
 292     mp_msg(MSGT_DECAUDIO,MSGL_ERR,"a52: no resampler. try different channel setup!\n");
 293     return 0;
 294   }
 295   return 1;
 296 }
 297
 298 static void uninit(sh_audio_t *sh)
 299 {
 300   a52_free(a52_state);
 301 }
 302
 303 static int control(sh_audio_t *sh,int cmd,void* arg, ...)
 304 {
 305     switch(cmd)
 306     {
 307       case ADCTRL_RESYNC_STREAM:
 308       case ADCTRL_SKIP_FRAME:
 309           a52_fillbuff(sh);
 310           return CONTROL_TRUE;
 311       case ADCTRL_SET_VOLUME: {
 312           float vol = *(float*)arg;
 313           if (vol > 60.0) vol = 60.0;
 314           a52_level = vol <= -200.0 ? 0 : pow(10.0,vol/20.0);
 315           return CONTROL_TRUE;
 316       }
 317       case ADCTRL_QUERY_FORMAT:
 318           if (*(int*)arg == AF_FORMAT_S16_NE ||
 319               *(int*)arg == AF_FORMAT_FLOAT_NE)
 320               return CONTROL_TRUE;
 321           return CONTROL_FALSE;
 322     }
 323   return CONTROL_UNKNOWN;
 324 }
 325
 326 static int decode_audio(sh_audio_t *sh_audio,unsigned char *buf,int minlen,int maxlen)
 327 {
 328     sample_t level=a52_level, bias=384;
 329     int flags=a52_flags|A52_ADJUST_LEVEL;
 330     int i,len=-1;
 331         if (sh_audio->sample_format == AF_FORMAT_FLOAT_NE)
 332             bias = 0;
 333         if(!sh_audio->a_in_buffer_len)
 334             if(a52_fillbuff(sh_audio)<0) return len; /* EOF */
 335         sh_audio->a_in_buffer_len=0;
 336         if (a52_frame (a52_state, sh_audio->a_in_buffer, &flags, &level, bias)){
 337             mp_msg(MSGT_DECAUDIO,MSGL_WARN,"a52: error decoding frame\n");
 338             return len;
 339         }
 340
 341         /* handle dynrng */
 342         if (a52_drc_action != DRC_NO_ACTION) {
 343             if (a52_drc_action == DRC_NO_COMPRESSION)
 344                 a52_dynrng(a52_state, NULL, NULL);
 345             else
 346                 a52_dynrng(a52_state, dynrng_call, NULL);
 347         }
 348
 349         len=0;
 350         for (i = 0; i < 6; i++) {
 351             if (a52_block (a52_state)){
 352                 mp_msg(MSGT_DECAUDIO,MSGL_WARN,"a52: error at resampling\n");
 353                 break;
 354             }
 355             len+=2*a52_resample(a52_samples(a52_state),(int16_t *)&buf[len]);
 356         }
 357         assert(len <= maxlen);
 358   return len;
 359 }