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464828faf2
remixing-produce-lfe controls upmixing, and remixing-consume-lfe controls downmixing. The motivation is that a user might want to synthesize LFE while playing stereo audio on his/her 5.1 speakers, but at the same time follow the industry recommendation to omit the LFE channel when producting a stereo downmix (e.g. for headphones) from 5.1 content. Or the other way round. Fixes: #753.
181 lines
6.3 KiB
C
181 lines
6.3 KiB
C
#ifndef fooresamplerhfoo
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#define fooresamplerhfoo
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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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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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#include <pulse/channelmap.h>
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#include <pulsecore/memblock.h>
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#include <pulsecore/memchunk.h>
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#include <pulsecore/sconv.h>
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#include <pulsecore/remap.h>
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#include <pulsecore/filter/lfe-filter.h>
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typedef struct pa_resampler pa_resampler;
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typedef struct pa_resampler_impl pa_resampler_impl;
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struct pa_resampler_impl {
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void (*free)(pa_resampler *r);
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void (*update_rates)(pa_resampler *r);
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/* Returns the number of leftover frames in the input buffer. */
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unsigned (*resample)(pa_resampler *r, const pa_memchunk *in, unsigned in_n_frames, pa_memchunk *out, unsigned *out_n_frames);
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void (*reset)(pa_resampler *r);
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void *data;
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};
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typedef enum pa_resample_method {
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PA_RESAMPLER_INVALID = -1,
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PA_RESAMPLER_SRC_SINC_BEST_QUALITY = 0, /* = SRC_SINC_BEST_QUALITY */
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PA_RESAMPLER_SRC_SINC_MEDIUM_QUALITY = 1, /* = SRC_SINC_MEDIUM_QUALITY */
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PA_RESAMPLER_SRC_SINC_FASTEST = 2, /* = SRC_SINC_FASTEST */
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PA_RESAMPLER_SRC_ZERO_ORDER_HOLD = 3, /* = SRC_ZERO_ORDER_HOLD */
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PA_RESAMPLER_SRC_LINEAR = 4, /* = SRC_LINEAR */
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PA_RESAMPLER_TRIVIAL,
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PA_RESAMPLER_SPEEX_FLOAT_BASE,
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PA_RESAMPLER_SPEEX_FLOAT_MAX = PA_RESAMPLER_SPEEX_FLOAT_BASE + 10,
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PA_RESAMPLER_SPEEX_FIXED_BASE,
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PA_RESAMPLER_SPEEX_FIXED_MAX = PA_RESAMPLER_SPEEX_FIXED_BASE + 10,
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PA_RESAMPLER_FFMPEG,
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PA_RESAMPLER_AUTO, /* automatic select based on sample format */
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PA_RESAMPLER_COPY,
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PA_RESAMPLER_PEAKS,
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PA_RESAMPLER_SOXR_MQ,
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PA_RESAMPLER_SOXR_HQ,
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PA_RESAMPLER_SOXR_VHQ,
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PA_RESAMPLER_MAX
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} pa_resample_method_t;
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typedef enum pa_resample_flags {
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PA_RESAMPLER_VARIABLE_RATE = 0x0001U,
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PA_RESAMPLER_NO_REMAP = 0x0002U, /* implies NO_REMIX */
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PA_RESAMPLER_NO_REMIX = 0x0004U,
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PA_RESAMPLER_NO_FILL_SINK = 0x0010U,
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PA_RESAMPLER_PRODUCE_LFE = 0x0020U,
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PA_RESAMPLER_CONSUME_LFE = 0x0040U,
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} pa_resample_flags_t;
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struct pa_resampler {
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pa_resample_method_t method;
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pa_resample_flags_t flags;
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pa_sample_spec i_ss, o_ss;
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pa_channel_map i_cm, o_cm;
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size_t i_fz, o_fz, w_fz, w_sz;
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pa_mempool *mempool;
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pa_memchunk to_work_format_buf;
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pa_memchunk remap_buf;
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pa_memchunk resample_buf;
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pa_memchunk from_work_format_buf;
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size_t to_work_format_buf_size;
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size_t remap_buf_size;
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size_t resample_buf_size;
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size_t from_work_format_buf_size;
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/* points to buffer before resampling stage, remap or to_work */
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pa_memchunk *leftover_buf;
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size_t *leftover_buf_size;
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/* have_leftover points to leftover_in_remap or leftover_in_to_work */
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bool *have_leftover;
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bool leftover_in_remap;
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bool leftover_in_to_work;
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pa_sample_format_t work_format;
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uint8_t work_channels;
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pa_convert_func_t to_work_format_func;
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pa_convert_func_t from_work_format_func;
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pa_remap_t remap;
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bool map_required;
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pa_lfe_filter_t *lfe_filter;
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pa_resampler_impl impl;
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};
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pa_resampler* pa_resampler_new(
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pa_mempool *pool,
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const pa_sample_spec *a,
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const pa_channel_map *am,
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const pa_sample_spec *b,
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const pa_channel_map *bm,
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unsigned crossover_freq,
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pa_resample_method_t resample_method,
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pa_resample_flags_t flags);
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void pa_resampler_free(pa_resampler *r);
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/* Returns the size of an input memory block which is required to return the specified amount of output data */
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size_t pa_resampler_request(pa_resampler *r, size_t out_length);
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/* Inverse of pa_resampler_request() */
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size_t pa_resampler_result(pa_resampler *r, size_t in_length);
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/* Returns the maximum size of input blocks we can process without needing bounce buffers larger than the mempool tile size. */
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size_t pa_resampler_max_block_size(pa_resampler *r);
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/* Pass the specified memory chunk to the resampler and return the newly resampled data */
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void pa_resampler_run(pa_resampler *r, const pa_memchunk *in, pa_memchunk *out);
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/* Change the input rate of the resampler object */
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void pa_resampler_set_input_rate(pa_resampler *r, uint32_t rate);
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/* Change the output rate of the resampler object */
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void pa_resampler_set_output_rate(pa_resampler *r, uint32_t rate);
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/* Reinitialize state of the resampler, possibly due to seeking or other discontinuities */
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void pa_resampler_reset(pa_resampler *r);
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/* Rewind resampler */
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void pa_resampler_rewind(pa_resampler *r, size_t out_frames);
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/* Return the resampling method of the resampler object */
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pa_resample_method_t pa_resampler_get_method(pa_resampler *r);
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/* Try to parse the resampler method */
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pa_resample_method_t pa_parse_resample_method(const char *string);
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/* return a human readable string for the specified resampling method. Inverse of pa_parse_resample_method() */
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const char *pa_resample_method_to_string(pa_resample_method_t m);
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/* Return 1 when the specified resampling method is supported */
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int pa_resample_method_supported(pa_resample_method_t m);
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const pa_channel_map* pa_resampler_input_channel_map(pa_resampler *r);
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const pa_sample_spec* pa_resampler_input_sample_spec(pa_resampler *r);
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const pa_channel_map* pa_resampler_output_channel_map(pa_resampler *r);
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const pa_sample_spec* pa_resampler_output_sample_spec(pa_resampler *r);
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/* Implementation specific init functions */
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int pa_resampler_ffmpeg_init(pa_resampler *r);
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int pa_resampler_libsamplerate_init(pa_resampler *r);
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int pa_resampler_peaks_init(pa_resampler *r);
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int pa_resampler_speex_init(pa_resampler *r);
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int pa_resampler_trivial_init(pa_resampler*r);
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int pa_resampler_soxr_init(pa_resampler *r);
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/* Resampler-specific quirks */
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bool pa_speex_is_fixed_point(void);
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#endif
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