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034b77823a
So far PulseAudio only supported two different work formats: S16NE if it's sufficient to represent the input and output formats without loss of precision and FLOAT32NE in all other cases. For systems that use S32NE exclusively, this results in unnecessary conversions from S32NE to FLOAT32NE and back again. Add S32NE remap operations and make use of them (for the COPY and TRIVIAL resamplers) if both input and output format are S32NE. This avoids the back and forth conversions between S32NE and FLOAT32NE, significantly improving performance for those cases.
60 lines
2.1 KiB
C
60 lines
2.1 KiB
C
#ifndef fooremapfoo
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#define fooremapfoo
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/***
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This file is part of PulseAudio.
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Copyright 2004-2006 Lennart Poettering
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Copyright 2009 Wim Taymans <wim.taymans@collabora.co.uk.com>
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PulseAudio is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published
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by the Free Software Foundation; either version 2.1 of the License,
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or (at your option) any later version.
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PulseAudio is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with PulseAudio; if not, see <http://www.gnu.org/licenses/>.
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***/
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#include <pulse/sample.h>
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typedef struct pa_remap pa_remap_t;
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typedef void (*pa_do_remap_func_t) (pa_remap_t *m, void *d, const void *s, unsigned n);
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struct pa_remap {
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pa_sample_format_t format;
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pa_sample_spec i_ss, o_ss;
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float map_table_f[PA_CHANNELS_MAX][PA_CHANNELS_MAX];
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int32_t map_table_i[PA_CHANNELS_MAX][PA_CHANNELS_MAX];
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pa_do_remap_func_t do_remap;
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void *state; /* optional state information for the remap function */
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};
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void pa_init_remap_func(pa_remap_t *m);
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/* custom installation of init functions */
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typedef void (*pa_init_remap_func_t) (pa_remap_t *m);
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pa_init_remap_func_t pa_get_init_remap_func(void);
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void pa_set_init_remap_func(pa_init_remap_func_t func);
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/* Check if remapping can be performed by just copying some or all input
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* channels' data to output channels. Returns true and a table of input
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* channel indices, or false otherwise.
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*
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* The table contains an entry for each output channels. Each table entry given
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* either the input channel index to be copied, or -1 indicating that the
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* output channel is not used and hence zero.
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*/
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bool pa_setup_remap_arrange(const pa_remap_t *m, int8_t arrange[PA_CHANNELS_MAX]);
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void pa_set_remap_func(pa_remap_t *m, pa_do_remap_func_t func_s16,
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pa_do_remap_func_t func_s32, pa_do_remap_func_t func_float);
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#endif /* fooremapfoo */
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