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Diffstat (limited to '')
| -rw-r--r-- | src/modules/echo-cancel/adrian.c | 118 |
1 files changed, 118 insertions, 0 deletions
diff --git a/src/modules/echo-cancel/adrian.c b/src/modules/echo-cancel/adrian.c new file mode 100644 index 0000000..3c47fae --- /dev/null +++ b/src/modules/echo-cancel/adrian.c @@ -0,0 +1,118 @@ +/*** + This file is part of PulseAudio. + + Copyright 2010 Arun Raghavan <arun.raghavan@collabora.co.uk> + + Contributor: Wim Taymans <wim.taymans@gmail.com> + + The actual implementation is taken from the sources at + http://andreadrian.de/intercom/ - for the license, look for + adrian-license.txt in the same directory as this file. + + 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, see <http://www.gnu.org/licenses/>. +***/ + +#ifdef HAVE_CONFIG_H +#include <config.h> +#endif + +#include <pulse/xmalloc.h> + +#include <pulsecore/modargs.h> + +#include "echo-cancel.h" + +/* should be between 10-20 ms */ +#define DEFAULT_FRAME_SIZE_MS 20 + +static const char* const valid_modargs[] = { + "frame_size_ms", + NULL +}; + +static void pa_adrian_ec_fixate_spec(pa_sample_spec *rec_ss, pa_channel_map *rec_map, + pa_sample_spec *play_ss, pa_channel_map *play_map, + pa_sample_spec *out_ss, pa_channel_map *out_map) { + out_ss->format = PA_SAMPLE_S16NE; + out_ss->channels = 1; + pa_channel_map_init_mono(out_map); + + *play_ss = *out_ss; + *play_map = *out_map; + *rec_ss = *out_ss; + *rec_map = *out_map; +} + +bool pa_adrian_ec_init(pa_core *c, pa_echo_canceller *ec, + pa_sample_spec *rec_ss, pa_channel_map *rec_map, + pa_sample_spec *play_ss, pa_channel_map *play_map, + pa_sample_spec *out_ss, pa_channel_map *out_map, + uint32_t *nframes, const char *args) { + int rate, have_vector = 0; + uint32_t frame_size_ms; + pa_modargs *ma; + + if (!(ma = pa_modargs_new(args, valid_modargs))) { + pa_log("Failed to parse submodule arguments."); + goto fail; + } + + frame_size_ms = DEFAULT_FRAME_SIZE_MS; + if (pa_modargs_get_value_u32(ma, "frame_size_ms", &frame_size_ms) < 0 || frame_size_ms < 1 || frame_size_ms > 200) { + pa_log("Invalid frame_size_ms specification"); + goto fail; + } + + pa_adrian_ec_fixate_spec(rec_ss, rec_map, play_ss, play_map, out_ss, out_map); + + rate = out_ss->rate; + *nframes = (rate * frame_size_ms) / 1000; + ec->params.adrian.blocksize = (*nframes) * pa_frame_size(out_ss); + + pa_log_debug ("Using nframes %d, blocksize %u, channels %d, rate %d", *nframes, ec->params.adrian.blocksize, out_ss->channels, out_ss->rate); + + /* For now we only support SSE */ + if (c->cpu_info.cpu_type == PA_CPU_X86 && (c->cpu_info.flags.x86 & PA_CPU_X86_SSE)) + have_vector = 1; + + ec->params.adrian.aec = AEC_init(rate, have_vector); + if (!ec->params.adrian.aec) + goto fail; + + pa_modargs_free(ma); + return true; + +fail: + if (ma) + pa_modargs_free(ma); + return false; +} + +void pa_adrian_ec_run(pa_echo_canceller *ec, const uint8_t *rec, const uint8_t *play, uint8_t *out) { + unsigned int i; + + for (i = 0; i < ec->params.adrian.blocksize; i += 2) { + /* We know it's S16NE mono data */ + int r = *(int16_t *)(rec + i); + int p = *(int16_t *)(play + i); + *(int16_t *)(out + i) = (int16_t) AEC_doAEC(ec->params.adrian.aec, r, p); + } +} + +void pa_adrian_ec_done(pa_echo_canceller *ec) { + if (ec->params.adrian.aec) { + AEC_done(ec->params.adrian.aec); + ec->params.adrian.aec = NULL; + } +} |