| /* Copyright (c) 2014 The Chromium OS Authors. All rights reserved. |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include <stdlib.h> |
| #include <sys/param.h> |
| |
| #include "cras_audio_area.h" |
| #include "cras_audio_format.h" |
| #include "cras_mix.h" |
| |
| struct cras_audio_area *cras_audio_area_create(int num_channels) |
| { |
| struct cras_audio_area *area; |
| size_t sz; |
| |
| sz = sizeof(*area) + num_channels * sizeof(struct cras_channel_area); |
| area = calloc(1, sz); |
| area->num_channels = num_channels; |
| |
| return area; |
| } |
| |
| unsigned int cras_audio_area_copy(const struct cras_audio_area *dst, |
| unsigned int dst_offset, |
| const struct cras_audio_format *dst_fmt, |
| const struct cras_audio_area *src, |
| unsigned int src_offset, |
| float software_gain_scaler) |
| { |
| unsigned int src_idx, dst_idx; |
| unsigned int ncopy; |
| uint8_t *schan, *dchan; |
| |
| ncopy = MIN(src->frames - src_offset, dst->frames - dst_offset); |
| |
| /* TODO(dgreid) - this replaces a memcpy, it needs to be way faster. */ |
| for (src_idx = 0; src_idx < src->num_channels; src_idx++) { |
| for (dst_idx = 0; dst_idx < dst->num_channels; dst_idx++) { |
| if (!(src->channels[src_idx].ch_set & |
| dst->channels[dst_idx].ch_set)) |
| continue; |
| |
| schan = src->channels[src_idx].buf + |
| src_offset * src->channels[src_idx].step_bytes; |
| dchan = dst->channels[dst_idx].buf + |
| dst_offset * dst->channels[dst_idx].step_bytes; |
| |
| cras_mix_add_scale_stride( |
| dst_fmt->format, dchan, schan, ncopy, |
| dst->channels[dst_idx].step_bytes, |
| src->channels[src_idx].step_bytes, |
| software_gain_scaler); |
| } |
| } |
| |
| return ncopy; |
| } |
| |
| void cras_audio_area_destroy(struct cras_audio_area *area) |
| { |
| free(area); |
| } |
| |
| void cras_audio_area_config_channels(struct cras_audio_area *area, |
| const struct cras_audio_format *fmt) |
| { |
| unsigned int i, ch; |
| |
| /* For mono, config the channel type to match both front |
| * left and front right. |
| * TODO(hychao): add more mapping when we have like {FL, FC} |
| * for mono + kb mic. |
| */ |
| if ((fmt->num_channels == 1) && |
| ((fmt->channel_layout[CRAS_CH_FC] == 0) || |
| (fmt->channel_layout[CRAS_CH_FL] == 0))) { |
| channel_area_set_channel(area->channels, CRAS_CH_FL); |
| channel_area_set_channel(area->channels, CRAS_CH_FR); |
| return; |
| } |
| |
| for (i = 0; i < fmt->num_channels; i++) { |
| area->channels[i].ch_set = 0; |
| for (ch = 0; ch < CRAS_CH_MAX; ch++) |
| if (fmt->channel_layout[ch] == i) |
| channel_area_set_channel(&area->channels[i], |
| ch); |
| } |
| } |
| |
| void cras_audio_area_config_buf_pointers(struct cras_audio_area *area, |
| const struct cras_audio_format *fmt, |
| uint8_t *base_buffer) |
| { |
| int i; |
| const int sample_size = snd_pcm_format_physical_width(fmt->format) / 8; |
| |
| /* TODO(dgreid) - assuming interleaved audio here for now. */ |
| for (i = 0; i < area->num_channels; i++) { |
| area->channels[i].step_bytes = cras_get_format_bytes(fmt); |
| area->channels[i].buf = base_buffer + i * sample_size; |
| } |
| } |