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FFmpeg/libavdevice/sdl2.c
Alexander Strasser 36aee69f0d libavdevice: Improve example in deprecation message for opengl and sdl 
When piping ffmpeg into ffplay both programs write a status line in
the terminal. That causes flickering and invisibility of one or the
other status line.

As compromise set ffplay log level to warning, so it doesn't show
the status line.

The user is usually testing ffmpeg command lines and want's a
preview of the result. This way the user can see the ffmpeg output
and still see errors and warnings from ffplay, should they occur.

Additionally set PTS to zero in ffplay to lessen the delay until
the frames are displayed. Without it delay is quite observable
when e.g. live capturing with low frame rates.
2024-07-14 13:31:03 +02:00

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/*
* Copyright (c) 2016 Josh de Kock
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* libSDL2 output device
*/
#include <SDL.h>
#include <SDL_thread.h>
#include "libavutil/imgutils.h"
#include "libavutil/mem.h"
#include "libavutil/opt.h"
#include "libavutil/pixdesc.h"
#include "libavformat/mux.h"
typedef struct {
AVClass *class;
SDL_Window *window;
SDL_Renderer *renderer;
char *window_title;
int window_width, window_height; /**< size of the window */
int window_x, window_y; /**< position of the window */
int window_fullscreen;
int window_borderless;
int enable_quit_action;
SDL_Texture *texture;
int texture_fmt;
SDL_Rect texture_rect;
int inited;
int warned;
} SDLContext;
static const struct sdl_texture_format_entry {
enum AVPixelFormat format; int texture_fmt;
} sdl_texture_format_map[] = {
/*
* Not implemented in FFmpeg, but leaving here for completeness.
* { AV_PIX_FMT_NONE, SDL_PIXELFORMAT_ARGB4444 },
* { AV_PIX_FMT_NONE, SDL_PIXELFORMAT_RGBA4444 },
* { AV_PIX_FMT_NONE, SDL_PIXELFORMAT_ABGR4444 },
* { AV_PIX_FMT_NONE, SDL_PIXELFORMAT_BGRA4444 },
* { AV_PIX_FMT_NONE, SDL_PIXELFORMAT_ARGB1555 },
* { AV_PIX_FMT_NONE, SDL_PIXELFORMAT_RGBA5551 },
* { AV_PIX_FMT_NONE, SDL_PIXELFORMAT_ABGR1555 },
* { AV_PIX_FMT_NONE, SDL_PIXELFORMAT_BGRA5551 },
* { AV_PIX_FMT_NONE, SDL_PIXELFORMAT_ARGB2101010 },
*/
{ AV_PIX_FMT_RGB8, SDL_PIXELFORMAT_RGB332 },
{ AV_PIX_FMT_RGB444, SDL_PIXELFORMAT_RGB444 },
{ AV_PIX_FMT_RGB555, SDL_PIXELFORMAT_RGB555 },
{ AV_PIX_FMT_BGR555, SDL_PIXELFORMAT_BGR555 },
{ AV_PIX_FMT_RGB565, SDL_PIXELFORMAT_RGB565 },
{ AV_PIX_FMT_BGR565, SDL_PIXELFORMAT_BGR565 },
{ AV_PIX_FMT_RGB24, SDL_PIXELFORMAT_RGB24 },
{ AV_PIX_FMT_BGR24, SDL_PIXELFORMAT_BGR24 },
{ AV_PIX_FMT_0RGB32, SDL_PIXELFORMAT_RGB888 },
{ AV_PIX_FMT_0BGR32, SDL_PIXELFORMAT_BGR888 },
#if HAVE_BIGENDIAN
{ AV_PIX_FMT_RGB0, SDL_PIXELFORMAT_RGBX8888 },
{ AV_PIX_FMT_BGR0, SDL_PIXELFORMAT_BGRX8888 },
#else
{ AV_PIX_FMT_0BGR, SDL_PIXELFORMAT_RGBX8888 },
{ AV_PIX_FMT_0RGB, SDL_PIXELFORMAT_BGRX8888 },
#endif
{ AV_PIX_FMT_RGB32, SDL_PIXELFORMAT_ARGB8888 },
{ AV_PIX_FMT_RGB32_1, SDL_PIXELFORMAT_RGBA8888 },
{ AV_PIX_FMT_BGR32, SDL_PIXELFORMAT_ABGR8888 },
{ AV_PIX_FMT_BGR32_1, SDL_PIXELFORMAT_BGRA8888 },
{ AV_PIX_FMT_YUV420P, SDL_PIXELFORMAT_IYUV },
{ AV_PIX_FMT_YUYV422, SDL_PIXELFORMAT_YUY2 },
{ AV_PIX_FMT_UYVY422, SDL_PIXELFORMAT_UYVY },
{ AV_PIX_FMT_NONE, 0 },
};
static void compute_texture_rect(AVFormatContext *s)
{
AVRational sar, dar; /* sample and display aspect ratios */
SDLContext *sdl = s->priv_data;
AVStream *st = s->streams[0];
AVCodecParameters *codecpar = st->codecpar;
SDL_Rect *texture_rect = &sdl->texture_rect;
/* compute texture width and height from the codec context information */
sar = st->sample_aspect_ratio.num ? st->sample_aspect_ratio : (AVRational){ 1, 1 };
dar = av_mul_q(sar, (AVRational){ codecpar->width, codecpar->height });
/* we suppose the screen has a 1/1 sample aspect ratio */
if (sdl->window_width && sdl->window_height) {
/* fit in the window */
if (av_cmp_q(dar, (AVRational){ sdl->window_width, sdl->window_height }) > 0) {
/* fit in width */
texture_rect->w = sdl->window_width;
texture_rect->h = av_rescale(texture_rect->w, dar.den, dar.num);
} else {
/* fit in height */
texture_rect->h = sdl->window_height;
texture_rect->w = av_rescale(texture_rect->h, dar.num, dar.den);
}
} else {
if (sar.num > sar.den) {
texture_rect->w = codecpar->width;
texture_rect->h = av_rescale(texture_rect->w, dar.den, dar.num);
} else {
texture_rect->h = codecpar->height;
texture_rect->w = av_rescale(texture_rect->h, dar.num, dar.den);
}
sdl->window_width = texture_rect->w;
sdl->window_height = texture_rect->h;
}
texture_rect->x = (sdl->window_width - texture_rect->w) / 2;
texture_rect->y = (sdl->window_height - texture_rect->h) / 2;
}
static int sdl2_write_trailer(AVFormatContext *s)
{
SDLContext *sdl = s->priv_data;
if (sdl->texture)
SDL_DestroyTexture(sdl->texture);
sdl->texture = NULL;
if (sdl->renderer)
SDL_DestroyRenderer(sdl->renderer);
sdl->renderer = NULL;
if (sdl->window)
SDL_DestroyWindow(sdl->window);
sdl->window = NULL;
if (!sdl->inited)
SDL_Quit();
return 0;
}
static int sdl2_write_header(AVFormatContext *s)
{
SDLContext *sdl = s->priv_data;
AVStream *st = s->streams[0];
AVCodecParameters *codecpar = st->codecpar;
int i, ret = 0;
int flags = 0;
if (!sdl->warned) {
av_log(sdl, AV_LOG_WARNING,
"The sdl output device is deprecated due to being fundamentally incompatible with libavformat API. "
"For monitoring purposes in ffmpeg you can output to a file or use pipes and a video player.\n"
"Example: ffmpeg -i INPUT -f nut -c:v rawvideo - | ffplay -loglevel warning -vf setpts=0 -\n"
);
sdl->warned = 1;
}
if (!sdl->window_title)
sdl->window_title = av_strdup(s->url);
if (SDL_WasInit(SDL_INIT_VIDEO)) {
av_log(s, AV_LOG_WARNING,
"SDL video subsystem was already inited, you could have multiple SDL outputs. This may cause unknown behaviour.\n");
sdl->inited = 1;
}
if ( s->nb_streams > 1
|| codecpar->codec_type != AVMEDIA_TYPE_VIDEO
|| codecpar->codec_id != AV_CODEC_ID_RAWVIDEO) {
av_log(s, AV_LOG_ERROR, "Only supports one rawvideo stream\n");
goto fail;
}
for (i = 0; sdl_texture_format_map[i].format != AV_PIX_FMT_NONE; i++) {
if (sdl_texture_format_map[i].format == codecpar->format) {
sdl->texture_fmt = sdl_texture_format_map[i].texture_fmt;
break;
}
}
if (!sdl->texture_fmt) {
av_log(s, AV_LOG_ERROR,
"Unsupported pixel format '%s'.\n",
av_get_pix_fmt_name(codecpar->format));
goto fail;
}
/* resize texture to width and height from the codec context information */
flags = SDL_WINDOW_HIDDEN |
(sdl->window_fullscreen ? SDL_WINDOW_FULLSCREEN : 0) |
(sdl->window_borderless ? SDL_WINDOW_BORDERLESS : SDL_WINDOW_RESIZABLE);
/* initialization */
if (!sdl->inited){
if (SDL_Init(SDL_INIT_VIDEO) != 0) {
av_log(s, AV_LOG_ERROR, "Unable to initialize SDL: %s\n", SDL_GetError());
goto fail;
}
}
compute_texture_rect(s);
if (SDL_CreateWindowAndRenderer(sdl->window_width, sdl->window_height,
flags, &sdl->window, &sdl->renderer) != 0){
av_log(sdl, AV_LOG_ERROR, "Couldn't create window and renderer: %s\n", SDL_GetError());
goto fail;
}
SDL_SetWindowTitle(sdl->window, sdl->window_title);
SDL_SetWindowPosition(sdl->window, sdl->window_x, sdl->window_y);
SDL_ShowWindow(sdl->window);
sdl->texture = SDL_CreateTexture(sdl->renderer, sdl->texture_fmt, SDL_TEXTUREACCESS_STREAMING,
codecpar->width, codecpar->height);
if (!sdl->texture) {
av_log(sdl, AV_LOG_ERROR, "Unable to set create mode: %s\n", SDL_GetError());
goto fail;
}
av_log(s, AV_LOG_VERBOSE, "w:%d h:%d fmt:%s -> w:%d h:%d\n",
codecpar->width, codecpar->height, av_get_pix_fmt_name(codecpar->format),
sdl->window_width, sdl->window_height);
sdl->inited = 1;
return 0;
fail:
sdl2_write_trailer(s);
return ret;
}
static int sdl2_write_packet(AVFormatContext *s, AVPacket *pkt)
{
int ret, quit = 0;
SDLContext *sdl = s->priv_data;
AVCodecParameters *codecpar = s->streams[0]->codecpar;
uint8_t *data[4];
int linesize[4];
SDL_Event event;
if (SDL_PollEvent(&event)){
switch (event.type) {
case SDL_KEYDOWN:
switch (event.key.keysym.sym) {
case SDLK_ESCAPE:
case SDLK_q:
quit = 1;
break;
default:
break;
}
break;
case SDL_QUIT:
quit = 1;
break;
case SDL_WINDOWEVENT:
switch(event.window.event){
case SDL_WINDOWEVENT_RESIZED:
case SDL_WINDOWEVENT_SIZE_CHANGED:
sdl->window_width = event.window.data1;
sdl->window_height = event.window.data2;
compute_texture_rect(s);
break;
default:
break;
}
break;
default:
break;
}
}
if (quit && sdl->enable_quit_action) {
sdl2_write_trailer(s);
return AVERROR(EIO);
}
av_image_fill_arrays(data, linesize, pkt->data, codecpar->format, codecpar->width, codecpar->height, 1);
switch (sdl->texture_fmt) {
/* case SDL_PIXELFORMAT_ARGB4444:
* case SDL_PIXELFORMAT_RGBA4444:
* case SDL_PIXELFORMAT_ABGR4444:
* case SDL_PIXELFORMAT_BGRA4444:
* case SDL_PIXELFORMAT_ARGB1555:
* case SDL_PIXELFORMAT_RGBA5551:
* case SDL_PIXELFORMAT_ABGR1555:
* case SDL_PIXELFORMAT_BGRA5551:
* case SDL_PIXELFORMAT_ARGB2101010:
*/
case SDL_PIXELFORMAT_IYUV:
case SDL_PIXELFORMAT_YUY2:
case SDL_PIXELFORMAT_UYVY:
ret = SDL_UpdateYUVTexture(sdl->texture, NULL,
data[0], linesize[0],
data[1], linesize[1],
data[2], linesize[2]);
break;
case SDL_PIXELFORMAT_RGB332:
case SDL_PIXELFORMAT_RGB444:
case SDL_PIXELFORMAT_RGB555:
case SDL_PIXELFORMAT_BGR555:
case SDL_PIXELFORMAT_RGB565:
case SDL_PIXELFORMAT_BGR565:
case SDL_PIXELFORMAT_RGB24:
case SDL_PIXELFORMAT_BGR24:
case SDL_PIXELFORMAT_RGB888:
case SDL_PIXELFORMAT_RGBX8888:
case SDL_PIXELFORMAT_BGR888:
case SDL_PIXELFORMAT_BGRX8888:
case SDL_PIXELFORMAT_ARGB8888:
case SDL_PIXELFORMAT_RGBA8888:
case SDL_PIXELFORMAT_ABGR8888:
case SDL_PIXELFORMAT_BGRA8888:
ret = SDL_UpdateTexture(sdl->texture, NULL, data[0], linesize[0]);
break;
default:
av_log(NULL, AV_LOG_FATAL, "Unsupported pixel format\n");
ret = -1;
break;
}
SDL_RenderClear(sdl->renderer);
SDL_RenderCopy(sdl->renderer, sdl->texture, NULL, &sdl->texture_rect);
SDL_RenderPresent(sdl->renderer);
return ret;
}
#define OFFSET(x) offsetof(SDLContext,x)
static const AVOption options[] = {
{ "window_title", "set SDL window title", OFFSET(window_title), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, AV_OPT_FLAG_ENCODING_PARAM },
{ "window_size", "set SDL window forced size", OFFSET(window_width), AV_OPT_TYPE_IMAGE_SIZE, { .str = NULL }, 0, 0, AV_OPT_FLAG_ENCODING_PARAM },
{ "window_x", "set SDL window x position", OFFSET(window_x), AV_OPT_TYPE_INT, { .i64 = SDL_WINDOWPOS_CENTERED }, INT_MIN, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM },
{ "window_y", "set SDL window y position", OFFSET(window_y), AV_OPT_TYPE_INT, { .i64 = SDL_WINDOWPOS_CENTERED }, INT_MIN, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM },
{ "window_fullscreen", "set SDL window fullscreen", OFFSET(window_fullscreen), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, AV_OPT_FLAG_ENCODING_PARAM },
{ "window_borderless", "set SDL window border off", OFFSET(window_borderless), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, AV_OPT_FLAG_ENCODING_PARAM },
{ "window_enable_quit", "set if quit action is available", OFFSET(enable_quit_action), AV_OPT_TYPE_INT, {.i64=1}, 0, 1, AV_OPT_FLAG_ENCODING_PARAM },
{ NULL },
};
static const AVClass sdl2_class = {
.class_name = "sdl2 outdev",
.item_name = av_default_item_name,
.option = options,
.version = LIBAVUTIL_VERSION_INT,
.category = AV_CLASS_CATEGORY_DEVICE_VIDEO_OUTPUT,
};
const FFOutputFormat ff_sdl2_muxer = {
.p.name = "sdl,sdl2",
.p.long_name = NULL_IF_CONFIG_SMALL("SDL2 output device"),
.priv_data_size = sizeof(SDLContext),
.p.audio_codec = AV_CODEC_ID_NONE,
.p.video_codec = AV_CODEC_ID_RAWVIDEO,
.write_header = sdl2_write_header,
.write_packet = sdl2_write_packet,
.write_trailer = sdl2_write_trailer,
.p.flags = AVFMT_NOFILE | AVFMT_VARIABLE_FPS | AVFMT_NOTIMESTAMPS,
.p.priv_class = &sdl2_class,
};
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