1 /* Copyright (c) 2014 The Chromium OS Authors. All rights reserved. 2 * Use of this source code is governed by a BSD-style license that can be 3 * found in the LICENSE file. 4 */ 5 6 #include <stdlib.h> 7 #include <sys/param.h> 8 9 #include "cras_audio_area.h" 10 #include "cras_audio_format.h" 11 #include "cras_mix.h" 12 13 struct cras_audio_area *cras_audio_area_create(int num_channels) 14 { 15 struct cras_audio_area *area; 16 size_t sz; 17 18 sz = sizeof(*area) + num_channels * sizeof(struct cras_channel_area); 19 area = calloc(1, sz); 20 area->num_channels = num_channels; 21 22 return area; 23 } 24 25 unsigned int cras_audio_area_copy(const struct cras_audio_area *dst, 26 unsigned int dst_offset, 27 const struct cras_audio_format *dst_fmt, 28 const struct cras_audio_area *src, 29 unsigned int src_offset, 30 float software_gain_scaler) 31 { 32 unsigned int src_idx, dst_idx; 33 unsigned int ncopy; 34 uint8_t *schan, *dchan; 35 36 ncopy = MIN(src->frames - src_offset, dst->frames - dst_offset); 37 38 /* TODO(dgreid) - this replaces a memcpy, it needs to be way faster. */ 39 for (src_idx = 0; src_idx < src->num_channels; src_idx++) { 40 41 for (dst_idx = 0; dst_idx < dst->num_channels; dst_idx++) { 42 if (!(src->channels[src_idx].ch_set & 43 dst->channels[dst_idx].ch_set)) 44 continue; 45 46 schan = src->channels[src_idx].buf + 47 src_offset * src->channels[src_idx].step_bytes; 48 dchan = dst->channels[dst_idx].buf + 49 dst_offset * dst->channels[dst_idx].step_bytes; 50 51 cras_mix_add_scale_stride(dst_fmt->format, dchan, schan, 52 ncopy, 53 dst->channels[dst_idx].step_bytes, 54 src->channels[src_idx].step_bytes, 55 software_gain_scaler); 56 } 57 } 58 59 return ncopy; 60 } 61 62 void cras_audio_area_destroy(struct cras_audio_area *area) 63 { 64 free(area); 65 } 66 67 void cras_audio_area_config_channels(struct cras_audio_area *area, 68 const struct cras_audio_format *fmt) 69 { 70 unsigned int i, ch; 71 72 /* For mono, config the channel type to match both front 73 * left and front right. 74 * TODO(hychao): add more mapping when we have like {FL, FC} 75 * for mono + kb mic. 76 */ 77 if ((fmt->num_channels == 1) && 78 ((fmt->channel_layout[CRAS_CH_FC] == 0) || 79 (fmt->channel_layout[CRAS_CH_FL] == 0))) { 80 channel_area_set_channel(area->channels, CRAS_CH_FL); 81 channel_area_set_channel(area->channels, CRAS_CH_FR); 82 return; 83 } 84 85 for (i = 0; i < fmt->num_channels; i++) { 86 area->channels[i].ch_set = 0; 87 for (ch = 0; ch < CRAS_CH_MAX; ch++) 88 if (fmt->channel_layout[ch] == i) 89 channel_area_set_channel(&area->channels[i], ch); 90 } 91 92 } 93 94 void cras_audio_area_config_buf_pointers(struct cras_audio_area *area, 95 const struct cras_audio_format *fmt, 96 uint8_t *base_buffer) 97 { 98 int i; 99 const int sample_size = snd_pcm_format_physical_width(fmt->format) / 8; 100 101 /* TODO(dgreid) - assuming interleaved audio here for now. */ 102 for (i = 0 ; i < area->num_channels; i++) { 103 area->channels[i].step_bytes = cras_get_format_bytes(fmt); 104 area->channels[i].buf = base_buffer + i * sample_size; 105 } 106 } 107
