mirrors/pipewire
1
0
Fork 0
mirror of https://gitlab.freedesktop.org/pipewire/pipewire.git synced 2025-11-04 13:30:12 -05:00
Code Issues Projects Releases Packages Wiki Activity Actions

examples: improve examples

Browse source
This commit is contained in:
Wim Taymans 2019-01-31 11:58:35 +01:00
parent 31dacd9d6f
commit 550a2af044
4 changed files with 106 additions and 25 deletions
Download patch file Download diff file Expand all files Collapse all files

48
src/examples/audio-src.c
View file

@ -41,22 +41,17 @@
struct data {
struct pw_main_loop *loop;
struct pw_core *core;
struct pw_remote *remote;
struct pw_stream *stream;
double accumulator;
};
static void fill_f32(struct data *d, void *dest, int avail)
static void fill_f32(struct data *d, void *dest, int n_frames)
{
float *dst = dest, val;
int n_samples = avail / (sizeof(float) * DEFAULT_CHANNELS);
int i, c;
for (i = 0; i < n_samples; i++) {
for (i = 0; i < n_frames; i++) {
d->accumulator += M_PI_M2 * 440 / DEFAULT_RATE;
if (d->accumulator >= M_PI_M2)
d->accumulator -= M_PI_M2;
@ -67,11 +62,21 @@ static void fill_f32(struct data *d, void *dest, int avail)
}
}
/* our data processing function is in general:
*
* struct pw_buffer *b;
* b = pw_stream_dequeue_buffer(stream);
*
* .. generate stuff in the buffer ...
*
* pw_stream_queue_buffer(stream, b);
*/
static void on_process(void *userdata)
{
struct data *data = userdata;
struct pw_buffer *b;
struct spa_buffer *buf;
int n_frames, stride;
uint8_t *p;
if ((b = pw_stream_dequeue_buffer(data->stream)) == NULL)
@ -81,9 +86,14 @@ static void on_process(void *userdata)
if ((p = buf->datas[0].data) == NULL)
return;
fill_f32(data, p, buf->datas[0].maxsize);
stride = sizeof(float) * DEFAULT_CHANNELS;
n_frames = buf->datas[0].maxsize / stride;
buf->datas[0].chunk->size = buf->datas[0].maxsize;
fill_f32(data, p, n_frames);
buf->datas[0].chunk->offset = 0;
buf->datas[0].chunk->stride = stride;
buf->datas[0].chunk->size = n_frames * stride;
pw_stream_queue_buffer(data->stream, b);
}
@ -102,8 +112,21 @@ int main(int argc, char *argv[])
pw_init(&argc, &argv);
/* make a main loop. If you already have another main loop, you can add
* the fd of this pipewire mainloop to it. */
data.loop = pw_main_loop_new(NULL);
/* create a simple stream, the simple stream manages to core and remote
* objects for you if you don't need to deal with them
*
* If you plan to autoconnect your stream, you need to provide at least
* media, category and role properties
*
* Pass your events and a use_data pointer as the last arguments. This
* will inform you about the stream state. The most important event
* you need to listen to is the process event where you need to produce
* the data.
*/
data.stream = pw_stream_new_simple(
pw_main_loop_get_loop(data.loop),
"audio-src",
@ -115,14 +138,16 @@ int main(int argc, char *argv[])
&stream_events,
&data);
data.remote = pw_stream_get_remote(data.stream);
/* make one parameter with the supported formats. The SPA_PARAM_EnumFormat
* id means that this is a format enumeration. */
params[0] = spa_format_audio_raw_build(&b, SPA_PARAM_EnumFormat,
&SPA_AUDIO_INFO_RAW_INIT(
.format = SPA_AUDIO_FORMAT_F32,
.channels = DEFAULT_CHANNELS,
.rate = DEFAULT_RATE ));
/* now connect this stream. We ask that our process function is
* called in a realtime thread. */
pw_stream_connect(data.stream,
PW_DIRECTION_OUTPUT,
argc > 1 ? (uint32_t)atoi(argv[1]) : SPA_ID_INVALID,
@ -131,6 +156,7 @@ int main(int argc, char *argv[])
PW_STREAM_FLAG_RT_PROCESS,
params, 1);
/* and wait */
pw_main_loop_run(data.loop);
pw_stream_destroy(data.stream);