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mpv/video/out/vo_rpi.c

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/*
* This file is part of mpv.
*
* 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 <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include <stdbool.h>
#include <assert.h>
#include <bcm_host.h>
#include <interface/mmal/mmal.h>
#include <interface/mmal/util/mmal_util.h>
#include <interface/mmal/util/mmal_default_components.h>
#include <interface/mmal/vc/mmal_vc_api.h>
#include <libavutil/rational.h>
#include "common/common.h"
#include "common/msg.h"
#include "options/m_config.h"
#include "vo.h"
#include "video/mp_image.h"
#include "sub/osd.h"
#include "sub/img_convert.h"
// In theory, the number of RGBA subbitmaps the OSD code could give us is
// unlimited; but in practice there will be rarely many elements.
#define MAX_OSD_ELEMS MP_SUB_BB_LIST_MAX
struct osd_elem {
DISPMANX_RESOURCE_HANDLE_T resource;
DISPMANX_ELEMENT_HANDLE_T element;
};
struct osd_part {
struct osd_elem elems[MAX_OSD_ELEMS];
int num_elems;
int change_id;
bool needed;
};
struct priv {
DISPMANX_DISPLAY_HANDLE_T display;
DISPMANX_ELEMENT_HANDLE_T window;
DISPMANX_UPDATE_HANDLE_T update;
uint32_t w, h;
struct osd_part osd_parts[MAX_OSD_PARTS];
double osd_pts;
struct mp_osd_res osd_res;
MMAL_COMPONENT_T *renderer;
bool renderer_enabled;
struct mp_image *next_image;
// for RAM input
MMAL_POOL_T *swpool;
int background_layer;
int video_layer;
int osd_layer;
int display_nr;
int layer;
};
// Magic alignments (in pixels) expected by the MMAL internals.
#define ALIGN_W 32
#define ALIGN_H 16
// Make mpi point to buffer, assuming MMAL_ENCODING_I420.
// buffer can be NULL.
// Return the required buffer space.
static size_t layout_buffer(struct mp_image *mpi, MMAL_BUFFER_HEADER_T *buffer,
struct mp_image_params *params)
{
assert(params->imgfmt == IMGFMT_420P);
mp_image_set_params(mpi, params);
int w = MP_ALIGN_UP(params->w, ALIGN_W);
int h = MP_ALIGN_UP(params->h, ALIGN_H);
uint8_t *cur = buffer ? buffer->data : NULL;
size_t size = 0;
for (int i = 0; i < 3; i++) {
int div = i ? 2 : 1;
mpi->planes[i] = cur;
mpi->stride[i] = w / div;
size_t plane_size = h / div * mpi->stride[i];
if (cur)
cur += plane_size;
size += plane_size;
}
return size;
}
static void wipe_osd_part(struct vo *vo, struct osd_part *part)
{
struct priv *p = vo->priv;
for (int n = 0; n < part->num_elems; n++) {
vc_dispmanx_element_remove(p->update, part->elems[n].element);
vc_dispmanx_resource_delete(part->elems[n].resource);
}
part->num_elems = 0;
part->change_id = -1;
}
static void wipe_osd(struct vo *vo)
{
struct priv *p = vo->priv;
for (int x = 0; x < MAX_OSD_PARTS; x++)
wipe_osd_part(vo, &p->osd_parts[x]);
}
static int add_element(struct vo *vo, struct osd_part *part, int index,
struct sub_bitmap *sub)
{
struct priv *p = vo->priv;
VC_IMAGE_TYPE_T format = VC_IMAGE_ARGB8888; // assuming RPI is always LE
struct osd_elem *elem = &part->elems[index];
*elem = (struct osd_elem){0};
// I have no idea why stride must be passed in such a hacky way. It's not
// documented. Other software does it too. Other software claims aligning
// the width and "probably" the height is required too, but for me it works
// just fine without on rpi2. (See Weston's rpi renderer.)
elem->resource = vc_dispmanx_resource_create(format,
sub->w | (sub->stride << 16),
sub->h,
&(int32_t){0});
if (!elem->resource) {
MP_ERR(vo, "Could not create %dx%d sub-bitmap\n", sub->w, sub->h);
return -1;
}
VC_RECT_T rc = {.width = sub->w, .height = sub->h};
vc_dispmanx_resource_write_data(elem->resource, format,
sub->stride, sub->bitmap, &rc);
VC_RECT_T src = {.width = sub->w << 16, .height = sub->h << 16};
VC_RECT_T dst = {.x = sub->x, .y = sub->y, .width = sub->dw, .height = sub->dh};
VC_DISPMANX_ALPHA_T alpha = {
.flags = DISPMANX_FLAGS_ALPHA_FROM_SOURCE | DISPMANX_FLAGS_ALPHA_PREMULT,
.opacity = 0xFF,
};
elem->element = vc_dispmanx_element_add(p->update, p->display, p->osd_layer,
&dst, elem->resource, &src,
DISPMANX_PROTECTION_NONE,
&alpha, 0, 0);
if (!elem->element) {
MP_ERR(vo, "Could not create sub-bitmap element\n");
return -1;
}
return 0;
}
static void osd_draw_cb(void *ctx, struct sub_bitmaps *imgs)
{
struct vo *vo = ctx;
struct priv *p = vo->priv;
struct osd_part *part = &p->osd_parts[imgs->render_index];
part->needed = true;
if (imgs->change_id == part->change_id)
return;
wipe_osd_part(vo, part);
part->change_id = imgs->change_id;
for (int n = 0; n < imgs->num_parts; n++) {
if (part->num_elems == MAX_OSD_ELEMS) {
MP_ERR(vo, "Too many OSD elements.\n");
break;
}
int index = part->num_elems++;
if (add_element(vo, part, index, &imgs->parts[n]) < 0)
break;
}
}
static void update_osd(struct vo *vo)
{
struct priv *p = vo->priv;
for (int x = 0; x < MAX_OSD_PARTS; x++)
p->osd_parts[x].needed = false;
static const bool formats[SUBBITMAP_COUNT] = {[SUBBITMAP_RGBA] = true};
osd_draw(vo->osd, p->osd_res, p->osd_pts, 0, formats, osd_draw_cb, vo);
for (int x = 0; x < MAX_OSD_PARTS; x++) {
struct osd_part *part = &p->osd_parts[x];
if (!part->needed)
wipe_osd_part(vo, part);
}
}
static void resize(struct vo *vo)
{
struct priv *p = vo->priv;
MMAL_PORT_T *input = p->renderer->input[0];
struct mp_rect src, dst;
vo_get_src_dst_rects(vo, &src, &dst, &p->osd_res);
MMAL_DISPLAYREGION_T dr = {
.hdr = { .id = MMAL_PARAMETER_DISPLAYREGION,
.size = sizeof(MMAL_DISPLAYREGION_T), },
.src_rect = { .x = src.x0, .y = src.y0,
.width = src.x1 - src.x0, .height = src.y1 - src.y0, },
.dest_rect = { .x = dst.x0, .y = dst.y0,
.width = dst.x1 - dst.x0, .height = dst.y1 - dst.y0, },
.layer = p->video_layer,
.display_num = p->display_nr,
.set = MMAL_DISPLAY_SET_SRC_RECT | MMAL_DISPLAY_SET_DEST_RECT |
MMAL_DISPLAY_SET_LAYER | MMAL_DISPLAY_SET_NUM,
};
if (mmal_port_parameter_set(input, &dr.hdr))
MP_WARN(vo, "could not set video rectangle\n");
}
static void flip_page(struct vo *vo)
{
struct priv *p = vo->priv;
struct mp_image *mpi = p->next_image;
p->next_image = NULL;
// For OSD
vc_dispmanx_update_submit_sync(p->update);
p->update = vc_dispmanx_update_start(10);
if (mpi) {
MMAL_PORT_T *input = p->renderer->input[0];
MMAL_BUFFER_HEADER_T *ref = (void *)mpi->planes[3];
// Assume this field is free for use by us.
ref->user_data = mpi;
if (mmal_port_send_buffer(input, ref)) {
MP_ERR(vo, "could not queue picture!\n");
talloc_free(mpi);
}
}
}
static void free_mmal_buffer(void *arg)
{
MMAL_BUFFER_HEADER_T *buffer = arg;
mmal_buffer_header_release(buffer);
}
static void draw_image(struct vo *vo, mp_image_t *mpi)
{
struct priv *p = vo->priv;
talloc_free(p->next_image);
p->next_image = NULL;
p->osd_pts = mpi->pts;
update_osd(vo);
if (vo->params->imgfmt != IMGFMT_MMAL) {
MMAL_BUFFER_HEADER_T *buffer = mmal_queue_wait(p->swpool->queue);
if (!buffer) {
talloc_free(mpi);
MP_ERR(vo, "Can't allocate buffer.\n");
return;
}
mmal_buffer_header_reset(buffer);
struct mp_image *new_ref = mp_image_new_custom_ref(&(struct mp_image){0},
buffer,
free_mmal_buffer);
if (!new_ref) {
mmal_buffer_header_release(buffer);
talloc_free(mpi);
MP_ERR(vo, "Out of memory.\n");
return;
}
mp_image_setfmt(new_ref, IMGFMT_MMAL);
new_ref->planes[3] = (void *)buffer;
struct mp_image dmpi = {0};
buffer->length = layout_buffer(&dmpi, buffer, vo->params);
mp_image_copy(&dmpi, mpi);
talloc_free(mpi);
mpi = new_ref;
}
p->next_image = mpi;
}
static int query_format(struct vo *vo, int format)
{
return format == IMGFMT_MMAL || format == IMGFMT_420P;
}
static MMAL_FOURCC_T map_csp(enum mp_csp csp)
{
switch (csp) {
case MP_CSP_BT_601: return MMAL_COLOR_SPACE_ITUR_BT601;
case MP_CSP_BT_709: return MMAL_COLOR_SPACE_ITUR_BT709;
case MP_CSP_SMPTE_240M: return MMAL_COLOR_SPACE_SMPTE240M;
default: return MMAL_COLOR_SPACE_UNKNOWN;
}
}
static void control_port_cb(MMAL_PORT_T *port, MMAL_BUFFER_HEADER_T *buffer)
{
mmal_buffer_header_release(buffer);
}
static void input_port_cb(MMAL_PORT_T *port, MMAL_BUFFER_HEADER_T *buffer)
{
struct mp_image *mpi = buffer->user_data;
talloc_free(mpi);
}
static void disable_renderer(struct vo *vo)
{
struct priv *p = vo->priv;
if (p->renderer_enabled) {
mmal_port_disable(p->renderer->control);
mmal_port_disable(p->renderer->input[0]);
mmal_port_flush(p->renderer->control);
mmal_port_flush(p->renderer->input[0]);
mmal_component_disable(p->renderer);
}
mmal_pool_destroy(p->swpool);
p->swpool = NULL;
p->renderer_enabled = false;
}
static int reconfig(struct vo *vo, struct mp_image_params *params, int flags)
{
struct priv *p = vo->priv;
MMAL_PORT_T *input = p->renderer->input[0];
bool opaque = params->imgfmt == IMGFMT_MMAL;
vo->dwidth = p->w;
vo->dheight = p->h;
disable_renderer(vo);
AVRational dr = {params->d_w, params->d_h};
AVRational ir = {params->w, params->h};
AVRational par = av_div_q(dr, ir);
input->format->encoding = opaque ? MMAL_ENCODING_OPAQUE : MMAL_ENCODING_I420;
input->format->es->video.width = MP_ALIGN_UP(params->w, ALIGN_W);
input->format->es->video.height = MP_ALIGN_UP(params->h, ALIGN_H);
input->format->es->video.crop = (MMAL_RECT_T){0, 0, params->w, params->h};
input->format->es->video.par = (MMAL_RATIONAL_T){par.num, par.den};
input->format->es->video.color_space = map_csp(params->colorspace);
if (mmal_port_format_commit(input))
return -1;
input->buffer_num = MPMAX(input->buffer_num_min,
input->buffer_num_recommended) + 3;
input->buffer_size = MPMAX(input->buffer_size_min,
input->buffer_size_recommended);
if (!opaque) {
size_t size = layout_buffer(&(struct mp_image){0}, NULL, params);
if (input->buffer_size != size) {
MP_FATAL(vo, "We disagree with MMAL about buffer sizes.\n");
return -1;
}
p->swpool = mmal_pool_create(input->buffer_num, input->buffer_size);
if (!p->swpool) {
MP_FATAL(vo, "Could not allocate buffer pool.\n");
return -1;
}
}
resize(vo);
p->renderer_enabled = true;
if (mmal_port_enable(p->renderer->control, control_port_cb))
return -1;
if (mmal_port_enable(input, input_port_cb))
return -1;
if (mmal_component_enable(p->renderer)) {
MP_FATAL(vo, "Failed to enable video renderer.\n");
return -1;
}
return 0;
}
static struct mp_image *take_screenshot(struct vo *vo)
{
struct priv *p = vo->priv;
struct mp_image *img = mp_image_alloc(IMGFMT_BGR0, p->w, p->h);
if (!img)
return NULL;
DISPMANX_RESOURCE_HANDLE_T resource =
vc_dispmanx_resource_create(VC_IMAGE_ARGB8888,
img->w | ((img->w * 4) << 16), img->h,
&(int32_t){0});
if (!resource)
goto fail;
if (vc_dispmanx_snapshot(p->display, resource, 0))
goto fail;
VC_RECT_T rc = {.width = img->w, .height = img->h};
if (vc_dispmanx_resource_read_data(resource, &rc, img->planes[0], img->stride[0]))
goto fail;
vc_dispmanx_resource_delete(resource);
return img;
fail:
vc_dispmanx_resource_delete(resource);
talloc_free(img);
return NULL;
}
static int control(struct vo *vo, uint32_t request, void *data)
{
struct priv *p = vo->priv;
switch (request) {
case VOCTRL_GET_PANSCAN:
return VO_TRUE;
case VOCTRL_SET_PANSCAN:
if (p->renderer_enabled)
resize(vo);
return VO_TRUE;
case VOCTRL_REDRAW_FRAME:
update_osd(vo);
return VO_TRUE;
case VOCTRL_SCREENSHOT_WIN:
*(struct mp_image **)data = take_screenshot(vo);
return VO_TRUE;
}
return VO_NOTIMPL;
}
static void uninit(struct vo *vo)
{
struct priv *p = vo->priv;
talloc_free(p->next_image);
wipe_osd(vo);
if (p->update)
vc_dispmanx_update_submit_sync(p->update);
if (p->renderer) {
disable_renderer(vo);
mmal_component_release(p->renderer);
}
if (p->display)
vc_dispmanx_display_close(p->display);
mmal_vc_deinit();
}
static int preinit(struct vo *vo)
{
struct priv *p = vo->priv;
p->background_layer = p->layer;
p->video_layer = p->layer + 1;
p->osd_layer = p->layer + 2;
bcm_host_init();
if (mmal_vc_init()) {
MP_FATAL(vo, "Could not initialize MMAL.\n");
return -1;
}
p->display = vc_dispmanx_display_open(p->display_nr);
p->update = vc_dispmanx_update_start(0);
if (!p->display || !p->update) {
MP_FATAL(vo, "Could not get DISPMANX objects.\n");
goto fail;
}
if (mmal_component_create(MMAL_COMPONENT_DEFAULT_VIDEO_RENDERER, &p->renderer))
{
MP_FATAL(vo, "Could not create MMAL renderer.\n");
goto fail;
}
if (graphics_get_display_size(0, &p->w, &p->h) < 0) {
MP_FATAL(vo, "Could not get display size.\n");
goto fail;
}
MP_VERBOSE(vo, "Display size: %dx%d\n", p->w, p->h);
// Just use the whole screen.
VC_RECT_T dst = {.width = p->w, .height = p->h};
VC_RECT_T src = {.width = p->w << 16, .height = p->h << 16};
VC_DISPMANX_ALPHA_T alpha = {
.flags = DISPMANX_FLAGS_ALPHA_FIXED_ALL_PIXELS,
.opacity = 0xFF,
};
p->window = vc_dispmanx_element_add(p->update, p->display, p->background_layer,
&dst, 0, &src, DISPMANX_PROTECTION_NONE,
&alpha, 0, 0);
if (!p->window) {
MP_FATAL(vo, "Could not add DISPMANX element.\n");
goto fail;
}
vc_dispmanx_update_submit_sync(p->update);
p->update = vc_dispmanx_update_start(10);
return 0;
fail:
uninit(vo);
return -1;
}
#define OPT_BASE_STRUCT struct priv
static const struct m_option options[] = {
OPT_INT("display", display_nr, 0),
OPT_INT("layer", layer, 0, OPTDEF_INT(-10)),
{0},
};
const struct vo_driver video_out_rpi = {
.description = "Raspberry Pi (MMAL)",
.name = "rpi",
.preinit = preinit,
.query_format = query_format,
.reconfig = reconfig,
.control = control,
.draw_image = draw_image,
.flip_page = flip_page,
.uninit = uninit,
.priv_size = sizeof(struct priv),
.options = options,
};
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