diff options
Diffstat (limited to 'src/resampler.c')
| -rw-r--r-- | src/resampler.c | 180 |
1 files changed, 0 insertions, 180 deletions
diff --git a/src/resampler.c b/src/resampler.c deleted file mode 100644 index 4f5f6be3..00000000 --- a/src/resampler.c +++ /dev/null @@ -1,180 +0,0 @@ -/* $Id$ */ - -/*** - This file is part of polypaudio. - - polypaudio is free software; you can redistribute it and/or modify - it under the terms of the GNU General Public License as published - by the Free Software Foundation; either version 2 of the License, - or (at your option) any later version. - - polypaudio 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 General Public License - along with polypaudio; if not, write to the Free Software - Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 - USA. -***/ - -#ifdef HAVE_CONFIG_H -#include <config.h> -#endif - -#include <stdlib.h> -#include <assert.h> - -#include <samplerate.h> - -#include "resampler.h" -#include "sconv.h" - -struct pa_resampler { - struct pa_sample_spec i_ss, o_ss; - float* i_buf, *o_buf; - unsigned i_alloc, o_alloc; - size_t i_sz, o_sz; - - int channels; - - pa_convert_to_float32_func_t to_float32_func; - pa_convert_from_float32_func_t from_float32_func; - SRC_STATE *src_state; -}; - -struct pa_resampler* pa_resampler_new(const struct pa_sample_spec *a, const struct pa_sample_spec *b) { - struct pa_resampler *r; - int err; - assert(a && b && pa_sample_spec_valid(a) && pa_sample_spec_valid(b)); - - if (a->channels != b->channels && a->channels != 1 && b->channels != 1) - goto fail; - - if (a->format == PA_SAMPLE_ALAW || a->format == PA_SAMPLE_ULAW || b->format == PA_SAMPLE_ALAW || b->format == PA_SAMPLE_ULAW) - goto fail; - - r = malloc(sizeof(struct pa_resampler)); - assert(r); - - r->channels = a->channels; - if (b->channels < r->channels) - r->channels = b->channels; - - r->i_buf = r->o_buf = NULL; - r->i_alloc = r->o_alloc = 0; - - if (a->rate != b->rate) { - r->src_state = src_new(SRC_SINC_FASTEST, r->channels, &err); - if (err != 0 || !r->src_state) - goto fail; - } else - r->src_state = NULL; - - r->i_ss = *a; - r->o_ss = *b; - - r->i_sz = pa_sample_size(a); - r->o_sz = pa_sample_size(b); - - r->to_float32_func = pa_get_convert_to_float32_function(a->format); - r->from_float32_func = pa_get_convert_from_float32_function(b->format); - - assert(r->to_float32_func && r->from_float32_func); - - return r; - -fail: - if (r) - free(r); - - return NULL; -} - -void pa_resampler_free(struct pa_resampler *r) { - assert(r); - if (r->src_state) - src_delete(r->src_state); - free(r->i_buf); - free(r->o_buf); - free(r); -} - -size_t pa_resampler_request(struct pa_resampler *r, size_t out_length) { - assert(r && (out_length % r->o_sz) == 0); - - return (((out_length / r->o_sz)*r->i_ss.rate)/r->o_ss.rate) * r->i_sz; -} - - -void pa_resampler_run(struct pa_resampler *r, const struct pa_memchunk *in, struct pa_memchunk *out) { - unsigned i_nchannels, o_nchannels, ins, ons, eff_ins, eff_ons; - float *cbuf; - assert(r && in && out && in->length && in->memblock && (in->length % r->i_sz) == 0); - - /* How many input samples? */ - ins = in->length/r->i_sz; - - /* How much space for output samples? */ - if (r->src_state) - ons = (ins*r->o_ss.rate/r->i_ss.rate)+1024; - else - ons = ins; - - /* How many channels? */ - if (r->i_ss.channels == r->o_ss.channels) { - i_nchannels = o_nchannels = 1; - eff_ins = ins*r->i_ss.channels; /* effective samples */ - eff_ons = ons*r->o_ss.channels; - } else { - i_nchannels = r->i_ss.channels; - o_nchannels = r->o_ss.channels; - eff_ins = ins; - eff_ons = ons; - } - - out->memblock = pa_memblock_new(out->length = (ons*r->o_sz)); - out->index = 0; - assert(out->memblock); - - if (r->i_alloc < eff_ins) - r->i_buf = realloc(r->i_buf, sizeof(float) * (r->i_alloc = eff_ins)); - assert(r->i_buf); - - r->to_float32_func(eff_ins, in->memblock->data+in->index, i_nchannels, r->i_buf); - - if (r->src_state) { - int ret; - SRC_DATA data; - - if (r->o_alloc < eff_ons) - r->o_buf = realloc(r->o_buf, sizeof(float) * (r->o_alloc = eff_ons)); - assert(r->o_buf); - - data.data_in = r->i_buf; - data.input_frames = ins; - - data.data_out = r->o_buf; - data.output_frames = ons; - - data.src_ratio = (double) r->o_ss.rate / r->i_ss.rate; - data.end_of_input = 0; - - ret = src_process(r->src_state, &data); - assert(ret == 0); - assert((unsigned) data.input_frames_used == ins); - - cbuf = r->o_buf; - ons = data.output_frames_gen; - - if (r->i_ss.channels == r->o_ss.channels) - eff_ons = ons*r->o_ss.channels; - else - eff_ons = ons; - } else - cbuf = r->i_buf; - - r->from_float32_func(eff_ons, cbuf, out->memblock->data+out->index, o_nchannels); - out->length = ons*r->o_sz; -} |