diff options
Diffstat (limited to 'pjmedia/src/pjmedia/resample_speex.c')
| -rw-r--r-- | pjmedia/src/pjmedia/resample_speex.c | 147 |
1 files changed, 147 insertions, 0 deletions
diff --git a/pjmedia/src/pjmedia/resample_speex.c b/pjmedia/src/pjmedia/resample_speex.c new file mode 100644 index 00000000..85849466 --- /dev/null +++ b/pjmedia/src/pjmedia/resample_speex.c @@ -0,0 +1,147 @@ +/* $Id$ */ +/* + * Copyright (C) 2003-2007 Benny Prijono <benny@prijono.org> + * + * This program 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. + * + * This program 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 this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#include <pjmedia/resample.h> +#include <pjmedia/errno.h> +#include <pj/assert.h> +#include <pj/log.h> +#include <pj/pool.h> + +#include <speex/speex_resampler.h> + +#define THIS_FILE "resample.c" + + +struct pjmedia_resample +{ + SpeexResamplerState *state; +#if defined(PJ_HAS_FLOATING_POINT) && PJ_HAS_FLOATING_POINT != 0 + float *in_buffer; + float *out_buffer; +#endif + unsigned in_samples_per_frame; + unsigned out_samples_per_frame; +}; + + +PJ_DEF(pj_status_t) pjmedia_resample_create( pj_pool_t *pool, + pj_bool_t high_quality, + pj_bool_t large_filter, + unsigned channel_count, + unsigned rate_in, + unsigned rate_out, + unsigned samples_per_frame, + pjmedia_resample **p_resample) +{ + pjmedia_resample *resample; + int quality; + int err; + + PJ_ASSERT_RETURN(pool && p_resample && rate_in && + rate_out && samples_per_frame, PJ_EINVAL); + + resample = PJ_POOL_ZALLOC_T(pool, pjmedia_resample); + PJ_ASSERT_RETURN(resample, PJ_ENOMEM); + + if (high_quality) { + if (large_filter) + quality = 8; + else + quality = 7; + } else { + quality = 3; + } + + resample->in_samples_per_frame = samples_per_frame; + resample->out_samples_per_frame = rate_out / (rate_in / samples_per_frame); + resample->state = speex_resampler_init(channel_count, rate_in, rate_out, + quality, &err); + if (resample->state == NULL || err != RESAMPLER_ERR_SUCCESS) + return PJ_ENOMEM; + +#if defined(PJ_HAS_FLOATING_POINT) && PJ_HAS_FLOATING_POINT != 0 + resample->in_buffer = pj_pool_calloc(pool, resample->in_samples_per_frame, + sizeof(float)); + resample->out_buffer=pj_pool_calloc(pool, resample->out_samples_per_frame, + sizeof(float)); +#endif + + *p_resample = resample; + + PJ_LOG(5,(THIS_FILE, + "resample created: quality=%d, ch=%d, in/out rate=%d/%d", + quality, channel_count, rate_in, rate_out)); + return PJ_SUCCESS; +} + + +PJ_DEF(void) pjmedia_resample_run( pjmedia_resample *resample, + const pj_int16_t *input, + pj_int16_t *output ) +{ + spx_uint32_t in_length, out_length; + float *fp; + unsigned i; + + PJ_ASSERT_ON_FAIL(resample, return); + + in_length = resample->in_samples_per_frame; + out_length = resample->out_samples_per_frame; + +#if defined(PJ_HAS_FLOATING_POINT) && PJ_HAS_FLOATING_POINT != 0 + fp = resample->in_buffer; + for (i=0; i<in_length; ++i) { + fp[i] = input[i]; + } + speex_resampler_process_interleaved_float(resample->state, + resample->in_buffer, &in_length, + resample->out_buffer, &out_length); + fp = resample->out_buffer; + for (i=0; i<out_length; ++i) { + output[i] = (pj_int16_t)fp[i]; + } +#else + PJ_UNUSED_ARG(dst); + PJ_UNUSED_ARG(i); + speex_resampler_process_interleaved_int(resample->state, + (const __int16 *)input, &in_length, + (__int16 *)output, &out_length); +#endif + + pj_assert(in_length == resample->in_samples_per_frame); + pj_assert(out_length == resample->out_samples_per_frame); +} + + +PJ_DEF(unsigned) pjmedia_resample_get_input_size(pjmedia_resample *resample) +{ + PJ_ASSERT_RETURN(resample != NULL, 0); + return resample->in_samples_per_frame; +} + + +PJ_DEF(void) pjmedia_resample_destroy(pjmedia_resample *resample) +{ + PJ_ASSERT_ON_FAIL(resample, return); + if (resample->state) { + speex_resampler_destroy(resample->state); + resample->state = NULL; + } +} + |