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| author | Max Kellermann <max@duempel.org> | 2013-11-22 22:50:29 +0100 |
|---|---|---|
| committer | Max Kellermann <max@duempel.org> | 2013-11-22 23:27:56 +0100 |
| commit | fc7d5b055d98306af0c882282902a23e963f026d (patch) | |
| tree | be38c99eef3be2c4acfcbba4077842b7c17b738d /src/pcm | |
| parent | 87c8953e8ed660b59ea2452b4d3a431785c47495 (diff) | |
| download | mpd-fc7d5b055d98306af0c882282902a23e963f026d.tar.gz mpd-fc7d5b055d98306af0c882282902a23e963f026d.tar.xz mpd-fc7d5b055d98306af0c882282902a23e963f026d.zip | |
PcmResampleLibsamplerate: clip 24 bit data
Using pcm_resample_lsr_32() for 24 bit samples works, but may cause 24
bit overflows. This commit makes 24 bit a special case with explicit
clipping.
Diffstat (limited to 'src/pcm')
| -rw-r--r-- | src/pcm/PcmResample.cxx | 15 | ||||
| -rw-r--r-- | src/pcm/PcmResampleInternal.hxx | 9 | ||||
| -rw-r--r-- | src/pcm/PcmResampleLibsamplerate.cxx | 25 |
3 files changed, 47 insertions, 2 deletions
diff --git a/src/pcm/PcmResample.cxx b/src/pcm/PcmResample.cxx index df37826ba..01f269ea9 100644 --- a/src/pcm/PcmResample.cxx +++ b/src/pcm/PcmResample.cxx @@ -155,8 +155,19 @@ PcmResampler::Resample24(unsigned channels, unsigned src_rate, unsigned dest_rate, size_t *dest_size_r, Error &error_r) { +#ifdef HAVE_LIBSAMPLERATE + if (pcm_resample_lsr_enabled()) + return pcm_resample_lsr_24(this, channels, + src_rate, src_buffer, src_size, + dest_rate, dest_size_r, + error_r); +#else + (void)error_r; +#endif + /* reuse the 32 bit code - the resampler code doesn't care if the upper 8 bits are actually used */ - return Resample32(channels, src_rate, src_buffer, src_size, - dest_rate, dest_size_r, error_r); + return pcm_resample_fallback_32(this, channels, + src_rate, src_buffer, src_size, + dest_rate, dest_size_r); } diff --git a/src/pcm/PcmResampleInternal.hxx b/src/pcm/PcmResampleInternal.hxx index 59bb2f5df..5090c13d1 100644 --- a/src/pcm/PcmResampleInternal.hxx +++ b/src/pcm/PcmResampleInternal.hxx @@ -69,6 +69,15 @@ pcm_resample_lsr_32(PcmResampler *state, unsigned dest_rate, size_t *dest_size_r, Error &error); +const int32_t * +pcm_resample_lsr_24(PcmResampler *state, + unsigned channels, + unsigned src_rate, + const int32_t *src_buffer, + size_t src_size, + unsigned dest_rate, size_t *dest_size_r, + Error &error); + #endif const int16_t * diff --git a/src/pcm/PcmResampleLibsamplerate.cxx b/src/pcm/PcmResampleLibsamplerate.cxx index 1986e8821..9eac2d545 100644 --- a/src/pcm/PcmResampleLibsamplerate.cxx +++ b/src/pcm/PcmResampleLibsamplerate.cxx @@ -19,6 +19,7 @@ #include "config.h" #include "PcmResampleInternal.hxx" +#include "PcmUtils.hxx" #include "util/ASCII.hxx" #include "util/Error.hxx" #include "util/Domain.hxx" @@ -283,3 +284,27 @@ pcm_resample_lsr_32(PcmResampler *state, return dest_buffer; } + +const int32_t * +pcm_resample_lsr_24(PcmResampler *state, + unsigned channels, + unsigned src_rate, + const int32_t *src_buffer, size_t src_size, + unsigned dest_rate, size_t *dest_size_r, + Error &error) +{ + const auto result = pcm_resample_lsr_32(state, channels, + src_rate, src_buffer, src_size, + dest_rate, dest_size_r, + error); + if (result != nullptr) + /* src_float_to_int_array() clamps for 32 bit + integers; now make sure everything's fine for 24 + bit */ + /* TODO: eliminate the 32 bit clamp to reduce overhead */ + PcmClampN<int32_t, int32_t, 24>(const_cast<int32_t *>(result), + result, + *dest_size_r / sizeof(*result)); + + return result; +} |