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audioconvert: allocate port buffers dynamically

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The port buffer table was embedded in struct port as a fixed array
buffers[MAX_BUFFERS] of struct buffer, each holding datas[MAX_DATAS]
(MAX_DATAS == SPA_AUDIO_MAX_CHANNELS == 64). This reserved ~17 KB per
port regardless of the actual buffer/channel count, multiplied by every
active port.

Allocate the buffer table and the per-buffer data-pointer pool in a
single calloc in port_use_buffers(), sized to the real number of
buffers and blocks, and release it in clear_buffers(). free_dir() now
clears each port so the allocation (and any mmapped buffer data) is
released on node destruction. This mirrors the dynamic-allocation
approach already used for the channelmix matrices and preserves a lot
of memory in the common low-channel-count case.

Co-authored-by: Copilot copilot@github.com
This commit is contained in:
Torkel Niklasson 2026-06-12 15:44:37 +02:00 • committed by Torkel Niklasson
parent b5555cc3f6
commit 65a5fa0250
1 changed files with 28 additions and 7 deletions
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35
spa/plugins/audioconvert/audioconvert.c
View file

@ -140,7 +140,7 @@ struct buffer {
uint32_t flags;
struct spa_list link;
struct spa_buffer *buf;
void *datas[MAX_DATAS];
void **datas;
};
struct port {
@ -162,7 +162,7 @@ struct port {
struct spa_param_info params[N_PORT_PARAMS];
char position[16];
struct buffer buffers[MAX_BUFFERS];
struct buffer *buffers;
uint32_t n_buffers;
struct spa_latency_info latency[2];
@ -3051,6 +3051,8 @@ static int clear_buffers(struct impl *this, struct port *port)
SPA_FLAG_CLEAR(b->flags, BUFFER_FLAG_MAPPED);
}
}
free(port->buffers);
port->buffers = NULL;
port->n_buffers = 0;
spa_list_init(&port->queue);
return 0;
@ -3351,6 +3353,21 @@ impl_node_port_use_buffers(void *object,
maxsize = this->quantum_limit * sizeof(float);
if (n_buffers > 0) {
void **datas;
size_t buffers_size = n_buffers * sizeof(struct buffer);
port->buffers = calloc(1, buffers_size +
n_buffers * port->blocks * sizeof(void*));
if (port->buffers == NULL) {
res = -errno;
goto error;
}
datas = SPA_PTROFF(port->buffers, buffers_size, void*);
for (i = 0; i < n_buffers; i++)
port->buffers[i].datas = &datas[i * port->blocks];
}
for (i = 0; i < n_buffers; i++) {
struct buffer *b;
uint32_t n_datas = buffers[i]->n_datas;
@ -4336,11 +4353,15 @@ static int impl_get_interface(struct spa_handle *handle, const char *type, void
return 0;
}
static void free_dir(struct dir *dir)
static void free_dir(struct impl *this, struct dir *dir)
{
uint32_t i;
for (i = 0; i < MAX_PORTS; i++)
free(dir->ports[i]);
for (i = 0; i < MAX_PORTS; i++) {
if (dir->ports[i] != NULL) {
clear_buffers(this, dir->ports[i]);
free(dir->ports[i]);
}
}
if (dir->conv.free)
convert_free(&dir->conv);
free(dir->tag);
@ -4355,8 +4376,8 @@ static int impl_clear(struct spa_handle *handle)
this = (struct impl *) handle;
free_dir(&this->dir[SPA_DIRECTION_INPUT]);
free_dir(&this->dir[SPA_DIRECTION_OUTPUT]);
free_dir(this, &this->dir[SPA_DIRECTION_INPUT]);
free_dir(this, &this->dir[SPA_DIRECTION_OUTPUT]);
free_tmp(this);