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module-rtp: make audio buffer size configurable

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Add new sess.buffer-size property that can override default 1<<22b buffer
size.
This commit is contained in:
Martin Geier 2025-12-10 15:46:17 +01:00 • committed by Carlos Rafael Giani
parent e7563b19b6
commit f935eb255c
4 changed files with 48 additions and 35 deletions
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29
src/modules/module-rtp/stream.c
View file

@ -31,10 +31,7 @@
PW_LOG_TOPIC_EXTERN(mod_topic);
#define PW_LOG_TOPIC_DEFAULT mod_topic
#define BUFFER_SIZE (1u<<22)
#define BUFFER_MASK (BUFFER_SIZE-1)
#define BUFFER_SIZE2 (BUFFER_SIZE>>1)
#define BUFFER_MASK2 (BUFFER_SIZE2-1)
#define BUFFER_SIZE1 (1u<<22)
/* IMPORTANT: When using calls that have return values, like
* rtp_stream_emit_open_connection, callers must set the variables
@ -117,7 +114,11 @@ struct impl {
uint32_t ts_align;
struct spa_ringbuffer ring;
uint8_t buffer[BUFFER_SIZE];
uint8_t *buffer;
uint32_t buffer_size;
uint32_t buffer_mask;
uint32_t buffer_size2;
uint32_t buffer_mask2;
uint64_t last_recv_timestamp;
struct spa_io_rate_match *io_rate_match;
@ -615,7 +616,7 @@ static void on_flush_timeout(void *d, uint64_t expirations)
static void default_reset_ringbuffer(struct impl *impl)
{
spa_memzero(impl->buffer, sizeof(impl->buffer));
spa_memzero(impl->buffer, impl->buffer_size);
}
struct rtp_stream *rtp_stream_new(struct pw_core *core,
@ -782,9 +783,18 @@ struct rtp_stream *rtp_stream_new(struct pw_core *core,
* then, all grid cells are guaranteed to have the size impl->stride, so the
* aforementioned division rest will always be zero.
*/
impl->actual_max_buffer_size = SPA_ROUND_DOWN(BUFFER_SIZE, impl->stride);
impl->buffer_size = pw_properties_get_uint32(props, "sess.buffer-size", BUFFER_SIZE1);
// find closest larger number rounded to power of two
impl->buffer_size = SPA_ROUND_UP_POW2_32(impl->buffer_size);
impl->buffer_mask = impl->buffer_size - 1;
impl->buffer_size2 = impl->buffer_size / 2;
impl->buffer_mask2 = impl->buffer_size2 - 1;
impl->buffer = calloc(1, impl->buffer_size);
impl->actual_max_buffer_size = SPA_ROUND_DOWN(impl->buffer_size, impl->stride);
pw_log_debug("possible / actual max buffer size: %" PRIu32 " / %" PRIu32,
(uint32_t)BUFFER_SIZE, impl->actual_max_buffer_size);
(uint32_t)impl->buffer_size, impl->actual_max_buffer_size);
pw_properties_setf(props, "rtp.mime", "%s", impl->format_info->mime);
@ -1046,6 +1056,9 @@ void rtp_stream_destroy(struct rtp_stream *s)
if (impl->data_loop)
pw_context_release_loop(impl->context, impl->data_loop);
if (impl->buffer)
free(impl->buffer);
spa_hook_list_clean(&impl->listener_list);
free(impl);
}