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