moved silence byte function

diff --git a/src/pcm/pcm_misc.c b/src/pcm/pcm_misc.c
index fa3a4fe4dbd4dbbae1f33f539632e5cb5af1763b..f2e18949eacf13a878a72442ae8c4f52d3711a31 100644 (file)
--- a/src/pcm/pcm_misc.c
+++ b/src/pcm/pcm_misc.c
@@ -228,6 +228,40 @@ const char *snd_pcm_get_format_name(int format)
        return formats[format];
 }
 
+unsigned char snd_pcm_format_silence(int format)
+{
+       switch (format) {
+       case SND_PCM_SFMT_IMA_ADPCM:    /* special case */
+       case SND_PCM_SFMT_MPEG:
+       case SND_PCM_SFMT_GSM:
+       case SND_PCM_SFMT_MU_LAW:
+       case SND_PCM_SFMT_A_LAW:
+               return 0;
+       case SND_PCM_SFMT_U8:
+       case SND_PCM_SFMT_U16_LE:
+       case SND_PCM_SFMT_U16_BE:
+       case SND_PCM_SFMT_U24_LE:
+       case SND_PCM_SFMT_U24_BE:
+       case SND_PCM_SFMT_U32_LE:
+       case SND_PCM_SFMT_U32_BE:
+               return 0x80;
+       case SND_PCM_SFMT_S8:
+       case SND_PCM_SFMT_S16_LE:
+       case SND_PCM_SFMT_S16_BE:
+       case SND_PCM_SFMT_S24_LE:
+       case SND_PCM_SFMT_S24_BE:
+       case SND_PCM_SFMT_S32_LE:
+       case SND_PCM_SFMT_S32_BE:
+               return 0;
+       case SND_PCM_SFMT_FLOAT:
+       case SND_PCM_SFMT_FLOAT64:
+       case SND_PCM_SFMT_IEC958_SUBFRAME_LE:
+       case SND_PCM_SFMT_IEC958_SUBFRAME_BE:
+               return 0;       
+       }
+       return 0;
+}
+
 static int linear_formats[4*2*2] = {
        SND_PCM_SFMT_S8,
        SND_PCM_SFMT_U8,