net/asterisk-chan-dongle/patches/100-fix-audio-on-big-endian-systems.patch

   1 --- a/channel.c
   2 +++ b/channel.c
   3 @@ -539,6 +539,19 @@ again:
   4         }
   5  }
   6
   7 +// see https://github.com/openwrt/telephony/issues/7
   8 +static inline void change_audio_endianness_to_le(struct iovec *iov, int iovcnt)
   9 +{
  10 +#if __BYTE_ORDER == __LITTLE_ENDIAN
  11 +   return; // nothing to do
  12 +#else
  13 +   for(;iovcnt-->0;iov++)
  14 +   {
  15 +      ast_swapcopy_samples(iov->iov_base, iov->iov_base, iov->iov_len/2);
  16 +   }
  17 +#endif
  18 +}
  19 +
  20  #/* */
  21  static void timing_write (struct pvt* pvt)
  22  {
  23 @@ -566,6 +579,7 @@ static void timing_write (struct pvt* pv
  24                         iovcnt = mixb_read_n_iov (&pvt->a_write_mixb, iov, FRAME_SIZE);
  25                         mixb_read_n_iov (&pvt->a_write_mixb, iov, FRAME_SIZE);
  26                         mixb_read_upd (&pvt->a_write_mixb, FRAME_SIZE);
  27 +                       change_audio_endianness_to_le(iov, iovcnt);
  28                 }
  29                 else if (used > 0)
  30                 {
  31 @@ -579,6 +593,7 @@ static void timing_write (struct pvt* pv
  32                         iov[iovcnt].iov_base    = silence_frame;
  33                         iov[iovcnt].iov_len     = FRAME_SIZE - used;
  34                         iovcnt++;
  35 +                       change_audio_endianness_to_le(iov, iovcnt);
  36                 }
  37                 else
  38                 {
  39 @@ -588,6 +603,7 @@ static void timing_write (struct pvt* pv
  40                         iov[0].iov_base         = silence_frame;
  41                         iov[0].iov_len          = FRAME_SIZE;
  42                         iovcnt                  = 1;
  43 +                       // ignore endianness for zeros
  44  //                     continue;
  45                 }
  46