diff options
Diffstat (limited to 'src/pcm_format.c')
| -rw-r--r-- | src/pcm_format.c | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/src/pcm_format.c b/src/pcm_format.c index d22dfb896..bb731b2b6 100644 --- a/src/pcm_format.c +++ b/src/pcm_format.c @@ -46,6 +46,18 @@ pcm_convert_32_to_16(struct pcm_dither *dither, pcm_dither_32_to_16(dither, out, in, in_end); } +static void +pcm_convert_float_to_16(int16_t *out, const float *in, const float *in_end) +{ + const unsigned OUT_BITS = 16; + const float factor = 1 << (OUT_BITS - 1); + + while (in < in_end) { + int sample = *in++ * factor; + *out++ = pcm_clamp_16(sample); + } +} + static int16_t * pcm_allocate_8_to_16(struct pcm_buffer *buffer, const int8_t *src, size_t src_size, size_t *dest_size_r) @@ -112,6 +124,20 @@ pcm_allocate_32_to_16(struct pcm_buffer *buffer, struct pcm_dither *dither, return dest; } +static int16_t * +pcm_allocate_float_to_16(struct pcm_buffer *buffer, + const float *src, size_t src_size, + size_t *dest_size_r) +{ + int16_t *dest; + *dest_size_r = src_size / 2; + assert(*dest_size_r == src_size / sizeof(*src) * sizeof(*dest)); + dest = pcm_buffer_get(buffer, *dest_size_r); + pcm_convert_float_to_16(dest, src, + pcm_end_pointer(src, src_size)); + return dest; +} + const int16_t * pcm_convert_to_16(struct pcm_buffer *buffer, struct pcm_dither *dither, enum sample_format src_format, const void *src, @@ -142,6 +168,10 @@ pcm_convert_to_16(struct pcm_buffer *buffer, struct pcm_dither *dither, case SAMPLE_FORMAT_S32: return pcm_allocate_32_to_16(buffer, dither, src, src_size, dest_size_r); + + case SAMPLE_FORMAT_FLOAT: + return pcm_allocate_float_to_16(buffer, src, src_size, + dest_size_r); } return NULL; @@ -170,6 +200,18 @@ pcm_convert_32_to_24(int32_t *restrict out, *out++ = *in++ >> 8; } +static void +pcm_convert_float_to_24(int32_t *out, const float *in, const float *in_end) +{ + const unsigned OUT_BITS = 24; + const float factor = 1 << (OUT_BITS - 1); + + while (in < in_end) { + int sample = *in++ * factor; + *out++ = pcm_clamp_24(sample); + } +} + static int32_t * pcm_allocate_8_to_24(struct pcm_buffer *buffer, const int8_t *src, size_t src_size, size_t *dest_size_r) @@ -203,6 +245,17 @@ pcm_allocate_32_to_24(struct pcm_buffer *buffer, return dest; } +static int32_t * +pcm_allocate_float_to_24(struct pcm_buffer *buffer, + const float *src, size_t src_size, + size_t *dest_size_r) +{ + *dest_size_r = src_size; + int32_t *dest = pcm_buffer_get(buffer, *dest_size_r); + pcm_convert_float_to_24(dest, src, pcm_end_pointer(src, src_size)); + return dest; +} + const int32_t * pcm_convert_to_24(struct pcm_buffer *buffer, enum sample_format src_format, const void *src, @@ -233,6 +286,10 @@ pcm_convert_to_24(struct pcm_buffer *buffer, case SAMPLE_FORMAT_S32: return pcm_allocate_32_to_24(buffer, src, src_size, dest_size_r); + + case SAMPLE_FORMAT_FLOAT: + return pcm_allocate_float_to_24(buffer, src, src_size, + dest_size_r); } return NULL; @@ -309,6 +366,20 @@ pcm_allocate_24p32_to_32(struct pcm_buffer *buffer, return dest; } +static int32_t * +pcm_allocate_float_to_32(struct pcm_buffer *buffer, + const float *src, size_t src_size, + size_t *dest_size_r) +{ + /* convert to S24_P32 first */ + int32_t *dest = pcm_allocate_float_to_24(buffer, src, src_size, + dest_size_r); + + /* convert to 32 bit in-place */ + pcm_convert_24_to_32(dest, dest, pcm_end_pointer(dest, *dest_size_r)); + return dest; +} + const int32_t * pcm_convert_to_32(struct pcm_buffer *buffer, enum sample_format src_format, const void *src, @@ -339,6 +410,10 @@ pcm_convert_to_32(struct pcm_buffer *buffer, case SAMPLE_FORMAT_S32: *dest_size_r = src_size; return src; + + case SAMPLE_FORMAT_FLOAT: + return pcm_allocate_float_to_32(buffer, src, src_size, + dest_size_r); } return NULL; |