1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
|
/*
* Copyright (c) 2011 Stefano Sabatini
*
* 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
* libSDL output device
*/
#include <SDL.h>
#include "libavutil/avstring.h"
#include "libavutil/opt.h"
#include "libavutil/parseutils.h"
#include "libavutil/pixdesc.h"
#include "avdevice.h"
typedef struct {
AVClass *class;
SDL_Surface *surface;
SDL_Overlay *overlay;
char *window_title;
char *icon_title;
int window_width, window_height; /**< size of the window */
int overlay_width, overlay_height; /**< size of the video in the window */
int overlay_x, overlay_y;
int overlay_fmt;
int sdl_was_already_inited;
} SDLContext;
static const struct sdl_overlay_pix_fmt_entry {
enum PixelFormat pix_fmt; int overlay_fmt;
} sdl_overlay_pix_fmt_map[] = {
{ PIX_FMT_YUV420P, SDL_IYUV_OVERLAY },
{ PIX_FMT_YUYV422, SDL_YUY2_OVERLAY },
{ PIX_FMT_UYVY422, SDL_UYVY_OVERLAY },
{ PIX_FMT_NONE, 0 },
};
static int sdl_write_trailer(AVFormatContext *s)
{
SDLContext *sdl = s->priv_data;
av_freep(&sdl->window_title);
av_freep(&sdl->icon_title);
if (sdl->overlay) {
SDL_FreeYUVOverlay(sdl->overlay);
sdl->overlay = NULL;
}
if (!sdl->sdl_was_already_inited)
SDL_Quit();
return 0;
}
static int sdl_write_header(AVFormatContext *s)
{
SDLContext *sdl = s->priv_data;
AVStream *st = s->streams[0];
AVCodecContext *encctx = st->codec;
AVRational sar, dar; /* sample and display aspect ratios */
int i, ret;
if (!sdl->window_title)
sdl->window_title = av_strdup(s->filename);
if (!sdl->icon_title)
sdl->icon_title = av_strdup(sdl->window_title);
if (SDL_WasInit(SDL_INIT_VIDEO)) {
av_log(s, AV_LOG_ERROR,
"SDL video subsystem was already inited, aborting.\n");
sdl->sdl_was_already_inited = 1;
ret = AVERROR(EINVAL);
goto fail;
}
if (SDL_Init(SDL_INIT_VIDEO) != 0) {
av_log(s, AV_LOG_ERROR, "Unable to initialize SDL: %s\n", SDL_GetError());
ret = AVERROR(EINVAL);
goto fail;
}
if ( s->nb_streams > 1
|| encctx->codec_type != AVMEDIA_TYPE_VIDEO
|| encctx->codec_id != CODEC_ID_RAWVIDEO) {
av_log(s, AV_LOG_ERROR, "Only supports one rawvideo stream\n");
ret = AVERROR(EINVAL);
goto fail;
}
for (i = 0; sdl_overlay_pix_fmt_map[i].pix_fmt != PIX_FMT_NONE; i++) {
if (sdl_overlay_pix_fmt_map[i].pix_fmt == encctx->pix_fmt) {
sdl->overlay_fmt = sdl_overlay_pix_fmt_map[i].overlay_fmt;
break;
}
}
if (!sdl->overlay_fmt) {
av_log(s, AV_LOG_ERROR,
"Unsupported pixel format '%s', choose one of yuv420p, yuyv422, or uyvy422.\n",
av_get_pix_fmt_name(encctx->pix_fmt));
ret = AVERROR(EINVAL);
goto fail;
}
/* compute overlay 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){ encctx->width, encctx->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 */
sdl->overlay_width = sdl->window_width;
sdl->overlay_height = av_rescale(sdl->overlay_width, dar.den, dar.num);
} else {
/* fit in height */
sdl->overlay_height = sdl->window_height;
sdl->overlay_width = av_rescale(sdl->overlay_height, dar.num, dar.den);
}
} else {
if (sar.num > sar.den) {
sdl->overlay_width = encctx->width;
sdl->overlay_height = av_rescale(sdl->overlay_width, dar.den, dar.num);
} else {
sdl->overlay_height = encctx->height;
sdl->overlay_width = av_rescale(sdl->overlay_height, dar.num, dar.den);
}
sdl->window_width = sdl->overlay_width;
sdl->window_height = sdl->overlay_height;
}
sdl->overlay_x = (sdl->window_width - sdl->overlay_width ) / 2;
sdl->overlay_y = (sdl->window_height - sdl->overlay_height) / 2;
SDL_WM_SetCaption(sdl->window_title, sdl->icon_title);
sdl->surface = SDL_SetVideoMode(sdl->window_width, sdl->window_height,
24, SDL_SWSURFACE);
if (!sdl->surface) {
av_log(s, AV_LOG_ERROR, "Unable to set video mode: %s\n", SDL_GetError());
ret = AVERROR(EINVAL);
goto fail;
}
sdl->overlay = SDL_CreateYUVOverlay(encctx->width, encctx->height,
sdl->overlay_fmt, sdl->surface);
if (!sdl->overlay || sdl->overlay->pitches[0] < encctx->width) {
av_log(s, AV_LOG_ERROR,
"SDL does not support an overlay with size of %dx%d pixels.\n",
encctx->width, encctx->height);
ret = AVERROR(EINVAL);
goto fail;
}
av_log(s, AV_LOG_INFO, "w:%d h:%d fmt:%s sar:%d/%d -> w:%d h:%d\n",
encctx->width, encctx->height, av_get_pix_fmt_name(encctx->pix_fmt), sar.num, sar.den,
sdl->overlay_width, sdl->overlay_height);
return 0;
fail:
sdl_write_trailer(s);
return ret;
}
static int sdl_write_packet(AVFormatContext *s, AVPacket *pkt)
{
SDLContext *sdl = s->priv_data;
AVCodecContext *encctx = s->streams[0]->codec;
SDL_Rect rect = { sdl->overlay_x, sdl->overlay_y, sdl->overlay_width, sdl->overlay_height };
AVPicture pict;
int i;
avpicture_fill(&pict, pkt->data, encctx->pix_fmt, encctx->width, encctx->height);
SDL_FillRect(sdl->surface, &sdl->surface->clip_rect,
SDL_MapRGB(sdl->surface->format, 0, 0, 0));
SDL_LockYUVOverlay(sdl->overlay);
for (i = 0; i < 3; i++) {
sdl->overlay->pixels [i] = pict.data [i];
sdl->overlay->pitches[i] = pict.linesize[i];
}
SDL_DisplayYUVOverlay(sdl->overlay, &rect);
SDL_UnlockYUVOverlay(sdl->overlay);
SDL_UpdateRect(sdl->surface, rect.x, rect.y, rect.w, rect.h);
return 0;
}
#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 },
{ "icon_title", "set SDL iconified window title", OFFSET(icon_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 },
{ NULL },
};
static const AVClass sdl_class = {
.class_name = "sdl outdev",
.item_name = av_default_item_name,
.option = options,
.version = LIBAVUTIL_VERSION_INT,
};
AVOutputFormat ff_sdl_muxer = {
.name = "sdl",
.long_name = NULL_IF_CONFIG_SMALL("SDL output device"),
.priv_data_size = sizeof(SDLContext),
.audio_codec = CODEC_ID_NONE,
.video_codec = CODEC_ID_RAWVIDEO,
.write_header = sdl_write_header,
.write_packet = sdl_write_packet,
.write_trailer = sdl_write_trailer,
.flags = AVFMT_NOFILE | AVFMT_VARIABLE_FPS | AVFMT_NOTIMESTAMPS,
.priv_class = &sdl_class,
};
|
