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/*
* This file is part of mpv video player.
* Copyright © 2014 Alexander Preisinger <alexander.preisinger@gmail.com>
*
* mpv is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* mpv is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with mpv. If not, see <http://www.gnu.org/licenses/>.
*/
#include "buffer.h"
#include "memfile.h"
#include <unistd.h>
#include <sys/mman.h>
int8_t format_get_bytes(const format_t *fmt)
{
return mp_imgfmt_get_desc(fmt->mp_format).bytes[0];
}
shm_buffer_t* shm_buffer_create(uint32_t width,
uint32_t height,
format_t fmt,
struct wl_shm *shm,
const struct wl_buffer_listener *listener)
{
int8_t bytes = format_get_bytes(&fmt);
uint32_t stride = SHM_BUFFER_STRIDE(width, bytes);
uint32_t size = stride * height;
shm_buffer_t *buffer = calloc(1, sizeof(shm_buffer_t));
int fd = memfile_create(size);
if (fd < 0)
return NULL;
buffer->data = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
if (buffer->data == MAP_FAILED) {
close(fd);
return NULL;
}
buffer->shm_pool = wl_shm_create_pool(shm, fd, size);
buffer->buffer = wl_shm_pool_create_buffer(buffer->shm_pool,
0, width, height, stride,
fmt.wl_format);
wl_buffer_add_listener(buffer->buffer, listener, buffer);
buffer->fd = fd;
buffer->height = height;
buffer->stride = stride;
buffer->format = fmt;
buffer->bytes = bytes;
buffer->pool_size = size;
buffer->pending_height = 0;
buffer->pending_width = 0;
return buffer;
}
int shm_buffer_resize(shm_buffer_t *buffer, uint32_t width, uint32_t height)
{
uint32_t new_stride = SHM_BUFFER_STRIDE(width, buffer->bytes);
uint32_t new_size = new_stride * height;
if (SHM_BUFFER_IS_BUSY(buffer)) {
SHM_BUFFER_SET_PNDNG_RSZ(buffer);
buffer->pending_width = width;
buffer->pending_height = height;
return SHM_BUFFER_BUSY;
}
SHM_BUFFER_CLEAR_PNDNG_RSZ(buffer);
if (new_size > buffer->pool_size) {
munmap(buffer->data, buffer->pool_size);
ftruncate(buffer->fd, new_size);
buffer->data = mmap(NULL, new_size, PROT_READ | PROT_WRITE,
MAP_SHARED, buffer->fd, 0);
// TODO: the buffer should be destroyed when -1 is return
if (buffer->data == MAP_FAILED)
return -1;
wl_shm_pool_resize(buffer->shm_pool, new_size);
buffer->pool_size = new_size;
}
const void *listener = wl_proxy_get_listener((struct wl_proxy*)buffer->buffer);
wl_buffer_destroy(buffer->buffer);
buffer->buffer = wl_shm_pool_create_buffer(buffer->shm_pool,
0, width, height, new_stride,
buffer->format.wl_format);
wl_buffer_add_listener(buffer->buffer, listener, buffer);
buffer->height = height;
buffer->stride = new_stride;
return 0;
}
int shm_buffer_pending_resize(shm_buffer_t *buffer)
{
if (SHM_BUFFER_PENDING_RESIZE(buffer)) {
SHM_BUFFER_CLEAR_PNDNG_RSZ(buffer);
return shm_buffer_resize(buffer, buffer->pending_width, buffer->pending_height);
}
else {
return 0;
}
}
void shm_buffer_destroy(shm_buffer_t *buffer)
{
if (!buffer)
return;
wl_buffer_destroy(buffer->buffer);
wl_shm_pool_destroy(buffer->shm_pool);
munmap(buffer->data, buffer->pool_size);
close(buffer->fd);
free(buffer);
}
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