mirror of https://github.com/mpv-player/mpv
138 lines
4.1 KiB
C
138 lines
4.1 KiB
C
/*
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* This file is part of mpv video player.
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* Copyright © 2014 Alexander Preisinger <alexander.preisinger@gmail.com>
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*
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* mpv is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* mpv is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with mpv. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "buffer.h"
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#include "memfile.h"
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#include <unistd.h>
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#include <sys/mman.h>
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int8_t format_get_bytes(const format_t *fmt)
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{
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return mp_imgfmt_get_desc(fmt->mp_format).bytes[0];
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}
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shm_buffer_t* shm_buffer_create(uint32_t width,
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uint32_t height,
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format_t fmt,
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struct wl_shm *shm,
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const struct wl_buffer_listener *listener)
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{
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int8_t bytes = format_get_bytes(&fmt);
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uint32_t stride = SHM_BUFFER_STRIDE(width, bytes);
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uint32_t size = stride * height;
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shm_buffer_t *buffer = calloc(1, sizeof(shm_buffer_t));
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int fd = memfile_create(size);
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if (fd < 0)
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return NULL;
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buffer->data = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
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if (buffer->data == MAP_FAILED) {
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close(fd);
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return NULL;
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}
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buffer->shm_pool = wl_shm_create_pool(shm, fd, size);
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buffer->buffer = wl_shm_pool_create_buffer(buffer->shm_pool,
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0, width, height, stride,
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fmt.wl_format);
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wl_buffer_add_listener(buffer->buffer, listener, buffer);
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buffer->fd = fd;
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buffer->height = height;
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buffer->stride = stride;
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buffer->format = fmt;
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buffer->bytes = bytes;
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buffer->pool_size = size;
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buffer->pending_height = 0;
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buffer->pending_width = 0;
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return buffer;
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}
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int shm_buffer_resize(shm_buffer_t *buffer, uint32_t width, uint32_t height)
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{
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uint32_t new_stride = SHM_BUFFER_STRIDE(width, buffer->bytes);
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uint32_t new_size = new_stride * height;
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if (SHM_BUFFER_IS_BUSY(buffer)) {
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SHM_BUFFER_SET_PNDNG_RSZ(buffer);
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buffer->pending_width = width;
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buffer->pending_height = height;
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return SHM_BUFFER_BUSY;
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}
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SHM_BUFFER_CLEAR_PNDNG_RSZ(buffer);
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if (new_size > buffer->pool_size) {
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munmap(buffer->data, buffer->pool_size);
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ftruncate(buffer->fd, new_size);
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buffer->data = mmap(NULL, new_size, PROT_READ | PROT_WRITE,
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MAP_SHARED, buffer->fd, 0);
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// TODO: the buffer should be destroyed when -1 is return
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if (buffer->data == MAP_FAILED)
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return -1;
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wl_shm_pool_resize(buffer->shm_pool, new_size);
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buffer->pool_size = new_size;
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}
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const void *listener = wl_proxy_get_listener((struct wl_proxy*)buffer->buffer);
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wl_buffer_destroy(buffer->buffer);
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buffer->buffer = wl_shm_pool_create_buffer(buffer->shm_pool,
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0, width, height, new_stride,
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buffer->format.wl_format);
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wl_buffer_add_listener(buffer->buffer, listener, buffer);
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buffer->height = height;
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buffer->stride = new_stride;
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return 0;
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}
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int shm_buffer_pending_resize(shm_buffer_t *buffer)
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{
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if (SHM_BUFFER_PENDING_RESIZE(buffer)) {
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SHM_BUFFER_CLEAR_PNDNG_RSZ(buffer);
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return shm_buffer_resize(buffer, buffer->pending_width, buffer->pending_height);
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}
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else {
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return 0;
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}
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}
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void shm_buffer_destroy(shm_buffer_t *buffer)
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{
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if (!buffer)
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return;
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wl_buffer_destroy(buffer->buffer);
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wl_shm_pool_destroy(buffer->shm_pool);
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munmap(buffer->data, buffer->pool_size);
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close(buffer->fd);
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free(buffer);
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}
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