diff options
Diffstat (limited to 'libmpcodecs/ad_alaw.c')
-rw-r--r-- | libmpcodecs/ad_alaw.c | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/libmpcodecs/ad_alaw.c b/libmpcodecs/ad_alaw.c new file mode 100644 index 0000000000..d1a7e4cfe4 --- /dev/null +++ b/libmpcodecs/ad_alaw.c @@ -0,0 +1,73 @@ +#include <stdio.h> +#include <stdlib.h> +#include <unistd.h> + +#include "config.h" +#include "ad_internal.h" + +static ad_info_t info = +{ + "aLaw/uLaw audio decoder", + "alaw", + AFM_ALAW, + "Nick Kurshev", + "A'rpi", + "" +}; + +LIBAD_EXTERN(alaw) + +#include "alaw.h" + +static int init(sh_audio_t *sh_audio) +{ + /* aLaw audio codec:*/ + if(!sh_audio->wf) return 0; + sh_audio->channels=sh_audio->wf->nChannels; + sh_audio->samplerate=sh_audio->wf->nSamplesPerSec; + sh_audio->i_bps=sh_audio->channels*sh_audio->samplerate; + return 1; +} + +static int preinit(sh_audio_t *sh) +{ + sh->audio_out_minsize=2048; + return 1; +} + +static void uninit(sh_audio_t *sh) +{ +} + +static int control(sh_audio_t *sh,int cmd,void* arg, ...) +{ + int skip; + switch(cmd) + { + case ADCTRL_SKIP_FRAME: + skip=sh->i_bps/16; + skip=skip&(~3); + demux_read_data(sh->ds,NULL,skip); + return CONTROL_TRUE; + default: + return CONTROL_UNKNOWN; + } + return CONTROL_UNKNOWN; +} + +static int decode_audio(sh_audio_t *sh_audio,unsigned char *buf,int minlen,int maxlen) +{ + int len; + int l=demux_read_data(sh_audio->ds,buf,minlen/2); + unsigned short *d=(unsigned short *) buf; + unsigned char *s=buf; + len=2*l; + if(sh_audio->format==6){ + /* aLaw */ + while(l>0){ --l; d[l]=alaw2short[s[l]]; } + } else { + /* uLaw */ + while(l>0){ --l; d[l]=ulaw2short[s[l]]; } + } + return len; +} |