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stream: expose pw_stream_set_param()

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Add a new pw_stream_set_param() method to configure a param on the
adapter.

This can be used to override the volume param for the adapter, for
example.
This commit is contained in:
Wim Taymans 2023-04-17 16:21:34 +02:00
parent bf1b3bb157
commit 680f12e437
2 changed files with 33 additions and 11 deletions
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29
src/pipewire/stream.c
View file

@ -156,7 +156,7 @@ struct stream {
unsigned int driving:1;
unsigned int using_trigger:1;
unsigned int trigger:1;
int in_set_control;
int in_set_param;
};
static int get_param_index(uint32_t id)
@ -566,7 +566,7 @@ static int impl_set_param(void *object, uint32_t id, uint32_t flags, const struc
if (id != SPA_PARAM_Props)
return -ENOTSUP;
if (impl->in_set_control == 0)
if (impl->in_set_param == 0)
pw_stream_emit_param_changed(stream, id, param);
return 0;
@ -2138,6 +2138,27 @@ int pw_stream_update_params(struct pw_stream *stream,
return res;
}
static inline int stream_set_param(struct stream *impl, uint32_t id, const struct spa_pod *param)
{
int res = 0;
impl->in_set_param++;
res = pw_impl_node_set_param(impl->node, id, 0, param);
impl->in_set_param--;
return res;
}
SPA_EXPORT
int pw_stream_set_param(struct pw_stream *stream, uint32_t id, const struct spa_pod *param)
{
struct stream *impl = SPA_CONTAINER_OF(stream, struct stream, this);
ensure_loop(impl->context->main_loop, return -EIO);
if (impl->node == NULL)
return -EIO;
return stream_set_param(impl, id, param);
}
SPA_EXPORT
int pw_stream_set_control(struct pw_stream *stream, uint32_t id, uint32_t n_values, float *values, ...)
{
@ -2194,9 +2215,7 @@ int pw_stream_set_control(struct pw_stream *stream, uint32_t id, uint32_t n_valu
va_end(varargs);
impl->in_set_control++;
pw_impl_node_set_param(impl->node, SPA_PARAM_Props, 0, pod);
impl->in_set_control--;
stream_set_param(impl, SPA_PARAM_Props, pod);
return 0;
}

15
src/pipewire/stream.h
View file

@ -447,12 +447,7 @@ int pw_stream_set_error(struct pw_stream *stream, /**< a \ref pw_stream */
const char *error, /**< an error message */
...) SPA_PRINTF_FUNC(3, 4);
/** Complete the negotiation process with result code \a res
*
* This function should be called after notification of the format.
* When \a res indicates success, \a params contain the parameters for the
* allocation state. */
/** Update the param exposed on the stream. */
int
pw_stream_update_params(struct pw_stream *stream, /**< a \ref pw_stream */
const struct spa_pod **params, /**< an array of params. The params should
@ -460,6 +455,14 @@ pw_stream_update_params(struct pw_stream *stream, /**< a \ref pw_stream */
* buffer allocation. */
uint32_t n_params /**< number of elements in \a params */);
/**
* Set a parameter on the stream. This is like pw_stream_set_control() but with
* a complete spa_pod param. It can also be called from the param_changed event handler
* to intercept and modify the param for the adapter. Since 0.3.70 */
int pw_stream_set_param(struct pw_stream *stream, /**< a \ref pw_stream */
uint32_t id, /**< the id of the param */
const struct spa_pod *param /**< the params to set */);
/** Get control values */
const struct pw_stream_control *pw_stream_get_control(struct pw_stream *stream, uint32_t id);