libmpcodecs/ad_liba52.c

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