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