#ifndef fooresamplerhfoo #define fooresamplerhfoo /*** This file is part of PulseAudio. Copyright 2004-2006 Lennart Poettering PulseAudio is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. PulseAudio is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with PulseAudio; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. ***/ #include #include #include #include #include #include typedef struct pa_resampler pa_resampler; typedef struct pa_resampler_impl pa_resampler_impl; struct pa_resampler_impl { void (*free)(pa_resampler *r); void (*update_rates)(pa_resampler *r); /* Returns the number of leftover frames in the input buffer. */ unsigned (*resample)(pa_resampler *r, const pa_memchunk *in, unsigned in_n_frames, pa_memchunk *out, unsigned *out_n_frames); void (*reset)(pa_resampler *r); void *data; }; typedef enum pa_resample_method { PA_RESAMPLER_INVALID = -1, PA_RESAMPLER_SRC_SINC_BEST_QUALITY = 0, /* = SRC_SINC_BEST_QUALITY */ PA_RESAMPLER_SRC_SINC_MEDIUM_QUALITY = 1, /* = SRC_SINC_MEDIUM_QUALITY */ PA_RESAMPLER_SRC_SINC_FASTEST = 2, /* = SRC_SINC_FASTEST */ PA_RESAMPLER_SRC_ZERO_ORDER_HOLD = 3, /* = SRC_ZERO_ORDER_HOLD */ PA_RESAMPLER_SRC_LINEAR = 4, /* = SRC_LINEAR */ PA_RESAMPLER_TRIVIAL, PA_RESAMPLER_SPEEX_FLOAT_BASE, PA_RESAMPLER_SPEEX_FLOAT_MAX = PA_RESAMPLER_SPEEX_FLOAT_BASE + 10, PA_RESAMPLER_SPEEX_FIXED_BASE, PA_RESAMPLER_SPEEX_FIXED_MAX = PA_RESAMPLER_SPEEX_FIXED_BASE + 10, PA_RESAMPLER_FFMPEG, PA_RESAMPLER_AUTO, /* automatic select based on sample format */ PA_RESAMPLER_COPY, PA_RESAMPLER_PEAKS, PA_RESAMPLER_MAX } pa_resample_method_t; typedef enum pa_resample_flags { PA_RESAMPLER_VARIABLE_RATE = 0x0001U, PA_RESAMPLER_NO_REMAP = 0x0002U, /* implies NO_REMIX */ PA_RESAMPLER_NO_REMIX = 0x0004U, PA_RESAMPLER_NO_LFE = 0x0008U } pa_resample_flags_t; struct pa_resampler { pa_resample_method_t method; pa_resample_flags_t flags; pa_sample_spec i_ss, o_ss; pa_channel_map i_cm, o_cm; size_t i_fz, o_fz, w_fz, w_sz; pa_mempool *mempool; pa_memchunk to_work_format_buf; pa_memchunk remap_buf; pa_memchunk resample_buf; pa_memchunk from_work_format_buf; size_t to_work_format_buf_size; size_t remap_buf_size; size_t resample_buf_size; size_t from_work_format_buf_size; /* points to buffer before resampling stage, remap or to_work */ pa_memchunk *leftover_buf; size_t *leftover_buf_size; /* have_leftover points to leftover_in_remap or leftover_in_to_work */ bool *have_leftover; bool leftover_in_remap; bool leftover_in_to_work; pa_sample_format_t work_format; uint8_t work_channels; pa_convert_func_t to_work_format_func; pa_convert_func_t from_work_format_func; pa_remap_t remap; bool map_required; pa_resampler_impl impl; }; pa_resampler* pa_resampler_new( pa_mempool *pool, const pa_sample_spec *a, const pa_channel_map *am, const pa_sample_spec *b, const pa_channel_map *bm, pa_resample_method_t resample_method, pa_resample_flags_t flags); void pa_resampler_free(pa_resampler *r); /* Returns the size of an input memory block which is required to return the specified amount of output data */ size_t pa_resampler_request(pa_resampler *r, size_t out_length); /* Inverse of pa_resampler_request() */ size_t pa_resampler_result(pa_resampler *r, size_t in_length); /* Returns the maximum size of input blocks we can process without needing bounce buffers larger than the mempool tile size. */ size_t pa_resampler_max_block_size(pa_resampler *r); /* Pass the specified memory chunk to the resampler and return the newly resampled data */ void pa_resampler_run(pa_resampler *r, const pa_memchunk *in, pa_memchunk *out); /* Change the input rate of the resampler object */ void pa_resampler_set_input_rate(pa_resampler *r, uint32_t rate); /* Change the output rate of the resampler object */ void pa_resampler_set_output_rate(pa_resampler *r, uint32_t rate); /* Reinitialize state of the resampler, possibly due to seeking or other discontinuities */ void pa_resampler_reset(pa_resampler *r); /* Return the resampling method of the resampler object */ pa_resample_method_t pa_resampler_get_method(pa_resampler *r); /* Try to parse the resampler method */ pa_resample_method_t pa_parse_resample_method(const char *string); /* return a human readable string for the specified resampling method. Inverse of pa_parse_resample_method() */ const char *pa_resample_method_to_string(pa_resample_method_t m); /* Return 1 when the specified resampling method is supported */ int pa_resample_method_supported(pa_resample_method_t m); const pa_channel_map* pa_resampler_input_channel_map(pa_resampler *r); const pa_sample_spec* pa_resampler_input_sample_spec(pa_resampler *r); const pa_channel_map* pa_resampler_output_channel_map(pa_resampler *r); const pa_sample_spec* pa_resampler_output_sample_spec(pa_resampler *r); /* Implementation specific init functions */ int pa_resampler_ffmpeg_init(pa_resampler *r); int pa_resampler_libsamplerate_init(pa_resampler *r); int pa_resampler_peaks_init(pa_resampler *r); int pa_resampler_speex_init(pa_resampler *r); int pa_resampler_trivial_init(pa_resampler*r); /* Resampler-specific quirks */ bool pa_speex_is_fixed_point(void); #endif