diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/spatial.c | 57 |
1 files changed, 36 insertions, 21 deletions
diff --git a/src/spatial.c b/src/spatial.c index 18173aa..710726f 100644 --- a/src/spatial.c +++ b/src/spatial.c @@ -1,3 +1,4 @@ +#include <stdio.h> #include <stdlib.h> #include <string.h> #include <math.h> @@ -35,10 +36,8 @@ error_realloc_buffer: return -1; } -static inline size_t sample_index(xas_spatial_scene *scene, float distance) { - size_t index = floorf(distance / scene->speed / scene->format.sample_rate); - - return (scene->buffer->index + index) % scene->buffer->size; +static inline size_t sample_delta(xas_spatial_scene *scene, float distance) { + return floorf(distance / scene->speed / scene->format.sample_rate); } static inline int16_t sample_scale(int16_t value, float distance) { @@ -46,7 +45,7 @@ static inline int16_t sample_scale(int16_t value, float distance) { } static void buffer_zero(xas_spatial_buffer *buffer, size_t count) { - int16_t *dest = (int16_t *)buffer + 1; + int16_t *dest = (int16_t *)(buffer + 1); size_t i = buffer->index; if (count > buffer->size) { @@ -58,8 +57,8 @@ static void buffer_zero(xas_spatial_buffer *buffer, size_t count) { i = 0; } - dest[i*XAS_AUDIO_STEREO] = 0; - dest[i*XAS_AUDIO_STEREO+1] = 0; + dest[XAS_AUDIO_STEREO*i] = 0; + dest[XAS_AUDIO_STEREO*i+1] = 0; i++; } @@ -68,20 +67,22 @@ static void buffer_zero(xas_spatial_buffer *buffer, size_t count) { static void buffer_copy(xas_spatial_buffer *buffer, int16_t *dest, size_t count) { - int16_t *src = (int16_t *)buffer + 1; - size_t i = buffer->index; + int16_t *src = (int16_t *)(buffer + 1); + + size_t index_i = buffer->index, + index_o; if (count > buffer->size) { count = buffer->size; } - while (count--) { - if (i == buffer->size) { - i = 0; + for (index_o=0; index_o<count; index_o++) { + if (index_i == buffer->size) { + index_i = 0; } - dest[i*XAS_AUDIO_STEREO] = src[i*XAS_AUDIO_STEREO]; - dest[i*XAS_AUDIO_STEREO+1] = src[i*XAS_AUDIO_STEREO+1]; + dest[XAS_AUDIO_STEREO*index_o] = src[XAS_AUDIO_STEREO*index_i]; + dest[XAS_AUDIO_STEREO*index_o+1] = src[XAS_AUDIO_STEREO*index_i+1]; } } @@ -104,14 +105,14 @@ ssize_t scene_fill(xas_spatial_scene *scene, float distance_l = dist(scene->speaker_l, obj->coord), distance_r = dist(scene->speaker_r, obj->coord); - size_t index_l, - index_r; + size_t delta_l, + delta_r; ssize_t readlen, i; if (distance_l > scene->radius || distance_r > scene->radius) { - continue; + goto next; } if ((readlen = xas_audio_stream_read(obj->source, @@ -124,29 +125,42 @@ ssize_t scene_fill(xas_spatial_scene *scene, readlen = buffer->size; } - index_l = sample_index(scene, distance_l); - index_r = sample_index(scene, distance_r); + delta_l = sample_delta(scene, distance_l); + delta_r = sample_delta(scene, distance_r); for (i=0; i<readlen; i++) { int16_t value_l = sample_scale(src[i], distance_l), value_r = sample_scale(src[i], distance_r); + size_t index_l, + index_r; + if (buffer->index == buffer->size) { buffer->index = 0; } - dest[XAS_AUDIO_STEREO*index_l+i] += value_l; - dest[XAS_AUDIO_STEREO*index_r+i+1] += value_r; + index_l = buffer->index + delta_l; + index_r = buffer->index + delta_r; + + dest[XAS_AUDIO_STEREO*index_l] += value_l; + dest[XAS_AUDIO_STEREO*index_r+1] += value_r; buffer->index++; } +next: buffer->index = index_old; obj = obj->next; } buffer_copy(buffer, output, count); + buffer->index += count; + + if (buffer->index == buffer->size) { + buffer->index = 0; + } + return count; error_audio_stream_read: @@ -167,6 +181,7 @@ xas_spatial_scene *xas_spatial_scene_new(xas_audio_format format, scene->format = format; scene->speaker_l = speaker_l; scene->speaker_r = speaker_r; + scene->radius = XAS_SPATIAL_DEFAULT_RADIUS; scene->speed = XAS_SPATIAL_DEFAULT_SPEED; if (buffer_realloc(scene, NULL) < 0) { |