libmpcodecs/ad_liba52.c

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