diff options
author | Carl Hetherington <carl@carlh.net> | 2010-04-09 14:11:47 +0000 |
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committer | Carl Hetherington <carl@carlh.net> | 2010-04-09 14:11:47 +0000 |
commit | f4ac9430f3fc2c405334f3f02fe08a5782454396 (patch) | |
tree | 2858264db409fc1bfe778554f86100f01c1f0b3d /libs/ardour/resampled_source.cc | |
parent | 77c09fc8248160ab60e2e229710d07934fe08894 (diff) |
Prevent clipping during the import of files from sources that have
amplitudes greater than 1 when data is being stored in files that
are clamped. e.g. when importing hot sources and resampling them
when the session file format is integer.
git-svn-id: svn://localhost/ardour2/branches/3.0@6879 d708f5d6-7413-0410-9779-e7cbd77b26cf
Diffstat (limited to 'libs/ardour/resampled_source.cc')
-rw-r--r-- | libs/ardour/resampled_source.cc | 60 |
1 files changed, 34 insertions, 26 deletions
diff --git a/libs/ardour/resampled_source.cc b/libs/ardour/resampled_source.cc index 57811312f1..675a0e426d 100644 --- a/libs/ardour/resampled_source.cc +++ b/libs/ardour/resampled_source.cc @@ -30,48 +30,33 @@ const uint32_t ResampledImportableSource::blocksize = 16384U; ResampledImportableSource::ResampledImportableSource (boost::shared_ptr<ImportableSource> src, nframes_t rate, SrcQuality srcq) : source (src) + , src_state (0) { - int err; - - source->seek (0); - - /* Initialize the sample rate converter. */ - - int src_type = SRC_SINC_BEST_QUALITY; + _src_type = SRC_SINC_BEST_QUALITY; switch (srcq) { case SrcBest: - src_type = SRC_SINC_BEST_QUALITY; + _src_type = SRC_SINC_BEST_QUALITY; break; case SrcGood: - src_type = SRC_SINC_MEDIUM_QUALITY; + _src_type = SRC_SINC_MEDIUM_QUALITY; break; case SrcQuick: - src_type = SRC_SINC_FASTEST; + _src_type = SRC_SINC_FASTEST; break; case SrcFast: - src_type = SRC_ZERO_ORDER_HOLD; + _src_type = SRC_ZERO_ORDER_HOLD; break; case SrcFastest: - src_type = SRC_LINEAR; + _src_type = SRC_LINEAR; break; } - if ((src_state = src_new (src_type, source->channels(), &err)) == 0) { - error << string_compose(_("Import: src_new() failed : %1"), src_strerror (err)) << endmsg ; - throw failed_constructor (); - } - - src_data.end_of_input = 0 ; /* Set this later. */ - - /* Start with zero to force load in while loop. */ - - src_data.input_frames = 0 ; - src_data.data_in = input ; + input = new float[blocksize]; + seek (0); + src_data.src_ratio = ((float) rate) / source->samplerate(); - - input = new float[blocksize]; } ResampledImportableSource::~ResampledImportableSource () @@ -106,7 +91,7 @@ ResampledImportableSource::read (Sample* output, nframes_t nframes) if (!src_data.end_of_input) { src_data.output_frames = nframes / source->channels(); } else { - src_data.output_frames = src_data.input_frames; + src_data.output_frames = std::min ((nframes_t) src_data.input_frames, nframes / source->channels()); } if ((err = src_process (src_state, &src_data))) { @@ -126,3 +111,26 @@ ResampledImportableSource::read (Sample* output, nframes_t nframes) return src_data.output_frames_gen * source->channels(); } +void +ResampledImportableSource::seek (nframes_t pos) +{ + source->seek (pos); + + /* and reset things so that we start from scratch with the conversion */ + + if (src_state) { + src_delete (src_state); + } + + int err; + + if ((src_state = src_new (_src_type, source->channels(), &err)) == 0) { + error << string_compose(_("Import: src_new() failed : %1"), src_strerror (err)) << endmsg ; + throw failed_constructor (); + } + + src_data.input_frames = 0; + src_data.data_in = input; + src_data.end_of_input = 0; +} + |