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#include "sydney.h"
#define MAX_OPERATIONS 10
typedef struct buffer_spec buffer_spec_t;
struct buffer_spec {
void *data;
size_t size;
size_t max_size;
};
typedef struct operation operation_t;
typedef void (*operation_execute_t)(operation_t *o, buffer_spec_t *source);
struct operation {
operation_execute_t execute;
struct buffer_spec result;
size_t sample
unsigned nchannels;
};
typedef struct pipeline pipeline_t;
struct pipeline {
operation_t operations[MAX_OPERATIONS];
};
static int native_pcm_format(pcm_format_t f) {
/* Sample formats we know to handle natively */
return
f == SA_PCM_FORMAT_S16_NE ||
f == SA_PCM_FORMAT_S32_NE ||
f == SA_PCM_FORMAT_FLOAT32_NE;
}
/* Steps: prefmt -> volume -> remap -> resample -> postfmt */
int build_pipeline_output(
sa_device_t *dev,
sa_pipeline_t *pipeline,
sa_pcm_format format,
unsigned rate,
unsigned nchannels,
const sa_channel_t map[]) {
int *channel_map_table;
unsigned u, t;
int prefmt_required;
int sum_required = 0;
int o = 0;
pcm_format_t work_format;
operation_execute_t func;
sa_assert(dev);
sa_assert(pipeline);
if (!(channel_map_table = sa_new(int, nchannels * dev->nchannels)))
return SA_ERROR_OOM;
for (u = 0; u < nchannels; u++) {
unsigned k = 0;
for (t = 0; t < dev->nchannels; t++) {
if (map[u] == map[t])
channel_map_table[u * dev->nchannels + k++] += t;
}
if (k > 1)
sum_required = 1;
channel_map_table[k] = (unsigned) -1;
}
prefmt_required =
sum_required ||
dev->output_volume != 0 ||
dev->rate != rate ||
dev->dsr_enabled;
if (native_pcm_format(dev->pcm_format))
prefmt_required = 0;
if (prefmt_required) {
switch (dev->pcm_format) {
case SA_PCM_FORMAT_U8:
case SA_PCM_FORMAT_ULAW:
case SA_PCM_FORMAT_ALAW:
case SA_PCM_FORMAT_S16_LE:
case SA_PCM_FORMAT_S16_BE:
work_format = SA_PCM_FORMAT_S16_NE;
break;
case SA_PCM_FORMAT_S24_LE:
case SA_PCM_FORMAT_S24_BE:
case SA_PCM_FORMAT_S32_LE:
case SA_PCM_FORMAT_S32_BE:
work_format = SA_PCM_FORMAT_S32_NE;
break;
case SA_PCM_FORMAT_FLOAT32_LE:
case SA_PCM_FORMAT_FLOAT32_BE:
work_format = SA_PCM_FORMAT_FLOAT32_NE;
break;
}
sa_assert(native_pcm_format(work_format));
func = get_format_converter(dev->pcm_format, work_format);
pipeline.operations[o].execute = func;
pipeline.operations[o].buffer.data = NULL;
pipeline.operations[o].buffer.stride = dev->nchannels * get_sample_size(dev->work_format);
pipeline.operations[o].
o++;
} else
work_format = dev->pcm_format;
if (dev->output_volume != 0) {
pipeline.operations[o].execute = get_scaler(work_format);
pipeline.operations[o].buffer.data = NULL;
o++;
}
if (dev->rate != rate || dev->dsr_enabled) {
pipeline.operations[o].execute = get_resampler(work_format);
pipeline.operations[o].buffer.data = NULL;
o++;
}
if (work_format != pcm_format) {
pipeline.operations[o].execute = get_format_converter(work_format, pcm_format);
pipeline.operations[o].buffer.data = NULL;
o++;
}
pipeline.operations[o].execute = NULL;
}
void execute_pipeline(sa_device_t *dev, pipeline_t *pipeline, const buffer_spec_t *buffer, buffer_spec_t *output) {
sa_operation_t *o;
sa_assert(dev);
sa_assert(pipeline);
sa_assert(buffer);
for (o = pipeline->operations; o->execute; o++) {
o->execute(o, buffer);
buffer = &o->buffer;
}
*output = *buffer;
}
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