VLC_API void aout_Interleave(void *dst, const void *src, unsigned samples,
unsigned channels, vlc_fourcc_t fourcc);
+VLC_API void aout_Deinterleave(void *dst, const void *src, unsigned samples,
+ unsigned channels, vlc_fourcc_t fourcc);
/**
* This fonction will compute the extraction parameter into pi_selection to go
#undef INTERLEAVE_TYPE
}
+/**
+ * Deinterleaves audio samples within a block of samples.
+ * \param dst destination buffer for planar samples
+ * \param src source buffer with interleaved samples
+ * \param samples number of samples (per channel/per plane)
+ * \param chans channels/planes count
+ * \param fourcc sample format (must be a linear sample format)
+ * \note The samples must be naturally aligned in memory.
+ * \warning Destination and source buffers MUST NOT overlap.
+ */
+void aout_Deinterleave( void *restrict dst, const void *restrict src,
+ unsigned samples, unsigned chans, vlc_fourcc_t fourcc )
+{
+#define DEINTERLEAVE_TYPE(type) \
+do { \
+ type *d = dst; \
+ const type *s = src; \
+ for( size_t i = 0; i < chans; i++ ) { \
+ for( size_t j = 0, k = 0; j < samples; j++, k += chans ) \
+ *(d++) = s[k]; \
+ s++; \
+ } \
+} while(0)
+
+ switch( fourcc )
+ {
+ case VLC_CODEC_U8: DEINTERLEAVE_TYPE(uint8_t); break;
+ case VLC_CODEC_S16N: DEINTERLEAVE_TYPE(uint16_t); break;
+ case VLC_CODEC_FL32: DEINTERLEAVE_TYPE(float); break;
+ case VLC_CODEC_S32N: DEINTERLEAVE_TYPE(int32_t); break;
+ case VLC_CODEC_FL64: DEINTERLEAVE_TYPE(double); break;
+ default: assert(0);
+ }
+#undef DEINTERLEAVE_TYPE
+}
+
/*****************************************************************************
* aout_ChannelExtract:
*****************************************************************************/