#include #include #include #include "config.h" #ifdef USE_LIBA52 #include "mp_msg.h" #include "help_mp.h" #include "ad_internal.h" #include "cpudetect.h" #include "../liba52/a52.h" #include "../liba52/mm_accel.h" static sample_t * a52_samples; static a52_state_t a52_state; static uint32_t a52_flags=0; #include "bswap.h" static ad_info_t info = { "AC3 decoding with liba52", "liba52", "Nick Kurshev", "Michel LESPINASSE", "" }; LIBAD_EXTERN(liba52) extern int audio_output_channels; int a52_fillbuff(sh_audio_t *sh_audio){ int length=0; int flags=0; int sample_rate=0; int bit_rate=0; sh_audio->a_in_buffer_len=0; /* sync frame:*/ while(1){ while(sh_audio->a_in_buffer_len<8){ int c=demux_getc(sh_audio->ds); if(c<0) return -1; /* EOF*/ sh_audio->a_in_buffer[sh_audio->a_in_buffer_len++]=c; } if(sh_audio->format!=0x2000) swab(sh_audio->a_in_buffer,sh_audio->a_in_buffer,8); length = a52_syncinfo (sh_audio->a_in_buffer, &flags, &sample_rate, &bit_rate); if(length>=7 && length<=3840) break; /* we're done.*/ /* bad file => resync*/ if(sh_audio->format!=0x2000) swab(sh_audio->a_in_buffer,sh_audio->a_in_buffer,8); memcpy(sh_audio->a_in_buffer,sh_audio->a_in_buffer+1,7); --sh_audio->a_in_buffer_len; } mp_msg(MSGT_DECAUDIO,MSGL_DBG2,"a52: len=%d flags=0x%X %d Hz %d bit/s\n",length,flags,sample_rate,bit_rate); sh_audio->samplerate=sample_rate; sh_audio->i_bps=bit_rate/8; demux_read_data(sh_audio->ds,sh_audio->a_in_buffer+8,length-8); if(sh_audio->format!=0x2000) swab(sh_audio->a_in_buffer+8,sh_audio->a_in_buffer+8,length-8); if(crc16_block(sh_audio->a_in_buffer+2,length-2)!=0) mp_msg(MSGT_DECAUDIO,MSGL_STATUS,"a52: CRC check failed! \n"); return length; } /* returns: number of available channels*/ static int a52_printinfo(sh_audio_t *sh_audio){ int flags, sample_rate, bit_rate; char* mode="unknown"; int channels=0; a52_syncinfo (sh_audio->a_in_buffer, &flags, &sample_rate, &bit_rate); switch(flags&A52_CHANNEL_MASK){ case A52_CHANNEL: mode="channel"; channels=2; break; case A52_MONO: mode="mono"; channels=1; break; case A52_STEREO: mode="stereo"; channels=2; break; case A52_3F: mode="3f";channels=3;break; case A52_2F1R: mode="2f+1r";channels=3;break; case A52_3F1R: mode="3f+1r";channels=4;break; case A52_2F2R: mode="2f+2r";channels=4;break; case A52_3F2R: mode="3f+2r";channels=5;break; case A52_CHANNEL1: mode="channel1"; channels=2; break; case A52_CHANNEL2: mode="channel2"; channels=2; break; case A52_DOLBY: mode="dolby"; channels=2; break; } mp_msg(MSGT_DECAUDIO,MSGL_INFO,"AC3: %d.%d (%s%s) %d Hz %3.1f kbit/s\n", channels, (flags&A52_LFE)?1:0, mode, (flags&A52_LFE)?"+lfe":"", sample_rate, bit_rate*0.001f); return (flags&A52_LFE) ? (channels+1) : channels; } static int preinit(sh_audio_t *sh) { /* Dolby AC3 audio: */ /* however many channels, 2 bytes in a word, 256 samples in a block, 6 blocks in a frame */ sh->audio_out_minsize=audio_output_channels*2*256*6; sh->audio_in_minsize=3840; return 1; } static int init(sh_audio_t *sh_audio) { uint32_t a52_accel=0; sample_t level=1, bias=384; int flags=0; /* Dolby AC3 audio:*/ if(gCpuCaps.hasSSE) a52_accel|=MM_ACCEL_X86_SSE; if(gCpuCaps.hasMMX) a52_accel|=MM_ACCEL_X86_MMX; if(gCpuCaps.hasMMX2) a52_accel|=MM_ACCEL_X86_MMXEXT; if(gCpuCaps.has3DNow) a52_accel|=MM_ACCEL_X86_3DNOW; if(gCpuCaps.has3DNowExt) a52_accel|=MM_ACCEL_X86_3DNOWEXT; if(gCpuCaps.hasAltiVec) a52_accel|=MM_ACCEL_PPC_ALTIVEC; a52_samples=a52_init (a52_accel); if (a52_samples == NULL) { mp_msg(MSGT_DECAUDIO,MSGL_ERR,"A52 init failed\n"); return 0; } if(a52_fillbuff(sh_audio)<0){ mp_msg(MSGT_DECAUDIO,MSGL_ERR,"A52 sync failed\n"); return 0; } /* 'a52 cannot upmix' hotfix:*/ a52_printinfo(sh_audio); sh_audio->channels=audio_output_channels; while(sh_audio->channels>0){ switch(sh_audio->channels){ case 1: a52_flags=A52_MONO; break; /* case 2: a52_flags=A52_STEREO; break;*/ case 2: a52_flags=A52_DOLBY; break; /* case 3: a52_flags=A52_3F; break;*/ case 3: a52_flags=A52_2F1R; break; case 4: a52_flags=A52_2F2R; break; /* 2+2*/ case 5: a52_flags=A52_3F2R; break; case 6: a52_flags=A52_3F2R|A52_LFE; break; /* 5.1*/ } /* test:*/ flags=a52_flags|A52_ADJUST_LEVEL; mp_msg(MSGT_DECAUDIO,MSGL_V,"A52 flags before a52_frame: 0x%X\n",flags); if (a52_frame (&a52_state, sh_audio->a_in_buffer, &flags, &level, bias)){ mp_msg(MSGT_DECAUDIO,MSGL_ERR,"a52: error decoding frame -> nosound\n"); return 0; } mp_msg(MSGT_DECAUDIO,MSGL_V,"A52 flags after a52_frame: 0x%X\n",flags); /* frame decoded, let's init resampler:*/ if(a52_resample_init(a52_accel,flags,sh_audio->channels)) break; --sh_audio->channels; /* try to decrease no. of channels*/ } if(sh_audio->channels<=0){ mp_msg(MSGT_DECAUDIO,MSGL_ERR,"a52: no resampler. try different channel setup!\n"); return 0; } return 1; } static void uninit(sh_audio_t *sh) { } static int control(sh_audio_t *sh,int cmd,void* arg, ...) { switch(cmd) { case ADCTRL_SKIP_FRAME: a52_fillbuff(sh); break; // skip AC3 frame return CONTROL_TRUE; } return CONTROL_UNKNOWN; } static int decode_audio(sh_audio_t *sh_audio,unsigned char *buf,int minlen,int maxlen) { sample_t level=1, bias=384; int flags=a52_flags|A52_ADJUST_LEVEL; int i,len=-1; if(!sh_audio->a_in_buffer_len) if(a52_fillbuff(sh_audio)<0) return len; /* EOF */ sh_audio->a_in_buffer_len=0; if (a52_frame (&a52_state, sh_audio->a_in_buffer, &flags, &level, bias)){ mp_msg(MSGT_DECAUDIO,MSGL_WARN,"a52: error decoding frame\n"); return len; } len=0; for (i = 0; i < 6; i++) { if (a52_block (&a52_state, a52_samples)){ mp_msg(MSGT_DECAUDIO,MSGL_WARN,"a52: error at resampling\n"); break; } len+=2*a52_resample(a52_samples,(int16_t *)&buf[len]); } return len; } #endif