lavd: Add SDL2 output device

Acked-by: Michael Niedermayer
Signed-off-by: Josh de Kock <josh@itanimul.li>

1 files changed, 377 insertions, 0 deletions

diff --git a/libavdevice/sdl2.c b/libavdevice/sdl2.c
new file mode 100644
index 0000000000..3d1ea42a58
--- /dev/null
+++ b/libavdevice/sdl2.c
@@ -0,0 +1,377 @@
+/*
+ * 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/avstring.h"
+#include "libavutil/imgutils.h"
+#include "libavutil/opt.h"
+#include "libavutil/parseutils.h"
+#include "libavutil/pixdesc.h"
+#include "libavutil/time.h"
+#include "avdevice.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_fullscreen;
+    int window_borderless;
+
+    SDL_Texture *texture;
+    int texture_fmt;
+    SDL_Rect texture_rect;
+
+    int inited;
+    SDL_Thread *event_thread;
+    SDL_mutex *mutex;
+    SDL_cond *init_cond;
+    int quit;
+} 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_RGB24,   SDL_PIXELFORMAT_RGB888 },
+    { AV_PIX_FMT_BGR24,   SDL_PIXELFORMAT_BGR888 },
+    { AV_PIX_FMT_RGB0,    SDL_PIXELFORMAT_RGBX8888 }, // needs to be checked
+    { AV_PIX_FMT_BGR0,    SDL_PIXELFORMAT_BGRX8888 }, // "
+    { AV_PIX_FMT_ARGB,    SDL_PIXELFORMAT_ARGB8888 }, // "
+    { AV_PIX_FMT_RGBA,    SDL_PIXELFORMAT_RGBA8888 },
+    { AV_PIX_FMT_ABGR,    SDL_PIXELFORMAT_ABGR8888 },
+    { AV_PIX_FMT_BGRA,    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;
+
+    sdl->quit = 1;
+
+    if (sdl->texture)
+        SDL_DestroyTexture(sdl->texture);
+    sdl->texture = NULL;
+    if (sdl->event_thread)
+        SDL_WaitThread(sdl->event_thread, NULL);
+    sdl->event_thread = NULL;
+    if (sdl->mutex)
+        SDL_DestroyMutex(sdl->mutex);
+    sdl->mutex = NULL;
+    if (sdl->init_cond)
+        SDL_DestroyCond(sdl->init_cond);
+    sdl->init_cond = 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;
+}
+
+#define SDL_BASE_FLAGS (SDL_SWSURFACE|SDL_WINDOW_RESIZABLE)
+
+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->window_title)
+        sdl->window_title = av_strdup(s->filename);
+
+    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', choose one of yuv420p, yuyv422, uyvy422, BGRA\n",
+               av_get_pix_fmt_name(codecpar->format));
+        goto fail;
+    }
+
+    /* resize texture to width and height from the codec context information */
+    flags = SDL_BASE_FLAGS | (sdl->window_fullscreen ? SDL_WINDOW_FULLSCREEN : 0) |
+                             (sdl->window_borderless ? SDL_WINDOW_BORDERLESS : 0);
+
+    /* 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;
+        }
+    }
+
+    sdl->window_width = sdl->texture_rect.w = codecpar->width;
+    sdl->window_height = sdl->texture_rect.h = codecpar->height;
+    sdl->texture_rect.x = sdl->texture_rect.y = 0;
+
+    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->texture = SDL_CreateTexture(sdl->renderer, sdl->texture_fmt, SDL_TEXTUREACCESS_STREAMING,
+                                     sdl->window_width, sdl->window_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 = 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:
+                sdl->quit = 1;
+                break;
+            default:
+                break;
+            }
+            break;
+        case SDL_QUIT:
+            sdl->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 (sdl->quit) {
+        sdl2_write_trailer(s);
+        return AVERROR(EIO);
+    }
+
+    av_image_fill_arrays(data, linesize, pkt->data, codecpar->format, codecpar->width, codecpar->height, 1);
+    SDL_LockMutex(sdl->mutex);
+    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);
+    SDL_UnlockMutex(sdl->mutex);
+    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_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 },
+    { 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,
+};
+
+AVOutputFormat ff_sdl2_muxer = {
+    .name           = "sdl2",
+    .long_name      = NULL_IF_CONFIG_SMALL("SDL2 output device"),
+    .priv_data_size = sizeof(SDLContext),
+    .audio_codec    = AV_CODEC_ID_NONE,
+    .video_codec    = AV_CODEC_ID_RAWVIDEO,
+    .write_header   = sdl2_write_header,
+    .write_packet   = sdl2_write_packet,
+    .write_trailer  = sdl2_write_trailer,
+    .flags          = AVFMT_NOFILE | AVFMT_VARIABLE_FPS | AVFMT_NOTIMESTAMPS,
+    .priv_class     = &sdl2_class,
+};