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ffmpeg/libavdevice/xv.c

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/*
* Copyright (c) 2013 Jeff Moguillansky
*
* 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
* XVideo output device
*
* TODO:
* - add support to more formats
* - add support to window id specification
*/
#include <X11/Xlib.h>
#include <X11/extensions/Xv.h>
#include <X11/extensions/XShm.h>
#include <X11/extensions/Xvlib.h>
#include <sys/shm.h>
#include "libavutil/opt.h"
#include "libavutil/pixdesc.h"
#include "libavutil/imgutils.h"
#include "avdevice.h"
typedef struct {
AVClass *class;
GC gc;
Window window;
char *window_title;
int window_width, window_height;
int window_x, window_y;
Display* display;
char *display_name;
XvImage* yuv_image;
enum AVPixelFormat image_format;
int image_width, image_height;
XShmSegmentInfo yuv_shminfo;
int xv_port;
} XVContext;
typedef struct XVTagFormatMap
{
int tag;
enum AVPixelFormat format;
} XVTagFormatMap;
static XVTagFormatMap tag_codec_map[] = {
{ MKTAG('I','4','2','0'), AV_PIX_FMT_YUV420P },
{ MKTAG('U','Y','V','Y'), AV_PIX_FMT_UYVY422 },
{ MKTAG('Y','U','Y','2'), AV_PIX_FMT_YUYV422 },
{ 0, AV_PIX_FMT_NONE }
};
static int xv_get_tag_from_format(enum AVPixelFormat format)
{
XVTagFormatMap *m = tag_codec_map;
int i;
for (i = 0; m->tag; m = &tag_codec_map[++i]) {
if (m->format == format)
return m->tag;
}
return 0;
}
static int xv_write_trailer(AVFormatContext *s)
{
XVContext *xv = s->priv_data;
if (xv->display) {
XShmDetach(xv->display, &xv->yuv_shminfo);
if (xv->yuv_image)
shmdt(xv->yuv_image->data);
XFree(xv->yuv_image);
if (xv->gc)
XFreeGC(xv->display, xv->gc);
XCloseDisplay(xv->display);
}
return 0;
}
static int xv_write_header(AVFormatContext *s)
{
XVContext *xv = s->priv_data;
unsigned int num_adaptors;
XvAdaptorInfo *ai;
XvImageFormatValues *fv;
int num_formats = 0, j, tag, ret;
AVCodecContext *encctx = s->streams[0]->codec;
if ( s->nb_streams > 1
|| encctx->codec_type != AVMEDIA_TYPE_VIDEO
|| encctx->codec_id != AV_CODEC_ID_RAWVIDEO) {
av_log(s, AV_LOG_ERROR, "Only supports one rawvideo stream\n");
return AVERROR(EINVAL);
}
if (!(tag = xv_get_tag_from_format(encctx->pix_fmt))) {
av_log(s, AV_LOG_ERROR,
"Unsupported pixel format '%s', only yuv420p, uyvy422, yuyv422 are currently supported\n",
av_get_pix_fmt_name(encctx->pix_fmt));
return AVERROR_PATCHWELCOME;
}
xv->image_format = encctx->pix_fmt;
xv->display = XOpenDisplay(xv->display_name);
if (!xv->display) {
av_log(s, AV_LOG_ERROR, "Could not open the X11 display '%s'\n", xv->display_name);
return AVERROR(EINVAL);
}
xv->image_width = encctx->width;
xv->image_height = encctx->height;
if (!xv->window_width && !xv->window_height) {
xv->window_width = encctx->width;
xv->window_height = encctx->height;
}
xv->window = XCreateSimpleWindow(xv->display, DefaultRootWindow(xv->display),
xv->window_x, xv->window_y,
xv->window_width, xv->window_height,
0, 0, 0);
if (!xv->window_title) {
if (!(xv->window_title = av_strdup(s->filename))) {
ret = AVERROR(ENOMEM);
goto fail;
}
}
XStoreName(xv->display, xv->window, xv->window_title);
XMapWindow(xv->display, xv->window);
if (XvQueryAdaptors(xv->display, DefaultRootWindow(xv->display), &num_adaptors, &ai) != Success) {
ret = AVERROR_EXTERNAL;
goto fail;
}
xv->xv_port = ai[0].base_id;
XvFreeAdaptorInfo(ai);
fv = XvListImageFormats(xv->display, xv->xv_port, &num_formats);
if (!fv) {
ret = AVERROR_EXTERNAL;
goto fail;
}
for (j = 0; j < num_formats; j++) {
if (fv[j].id == tag) {
break;
}
}
XFree(fv);
if (j >= num_formats) {
av_log(s, AV_LOG_ERROR,
"Device does not support pixel format %s, aborting\n",
av_get_pix_fmt_name(encctx->pix_fmt));
ret = AVERROR(EINVAL);
goto fail;
}
xv->gc = XCreateGC(xv->display, xv->window, 0, 0);
xv->image_width = encctx->width;
xv->image_height = encctx->height;
xv->yuv_image = XvShmCreateImage(xv->display, xv->xv_port, tag, 0,
xv->image_width, xv->image_height, &xv->yuv_shminfo);
xv->yuv_shminfo.shmid = shmget(IPC_PRIVATE, xv->yuv_image->data_size,
IPC_CREAT | 0777);
xv->yuv_shminfo.shmaddr = (char *)shmat(xv->yuv_shminfo.shmid, 0, 0);
xv->yuv_image->data = xv->yuv_shminfo.shmaddr;
xv->yuv_shminfo.readOnly = False;
XShmAttach(xv->display, &xv->yuv_shminfo);
XSync(xv->display, False);
shmctl(xv->yuv_shminfo.shmid, IPC_RMID, 0);
return 0;
fail:
xv_write_trailer(s);
return ret;
}
static int xv_write_packet(AVFormatContext *s, AVPacket *pkt)
{
XVContext *xv = s->priv_data;
XvImage *img = xv->yuv_image;
XWindowAttributes window_attrs;
AVPicture pict;
AVCodecContext *ctx = s->streams[0]->codec;
uint8_t *data[3] = {
img->data + img->offsets[0],
img->data + img->offsets[1],
img->data + img->offsets[2]
};
avpicture_fill(&pict, pkt->data, ctx->pix_fmt, ctx->width, ctx->height);
av_image_copy(data, img->pitches, (const uint8_t **)pict.data, pict.linesize,
xv->image_format, img->width, img->height);
XGetWindowAttributes(xv->display, xv->window, &window_attrs);
if (XvShmPutImage(xv->display, xv->xv_port, xv->window, xv->gc,
xv->yuv_image, 0, 0, xv->image_width, xv->image_height, 0, 0,
window_attrs.width, window_attrs.height, True) != Success) {
av_log(s, AV_LOG_ERROR, "Could not copy image to XV shared memory buffer\n");
return AVERROR_EXTERNAL;
}
return 0;
}
#define OFFSET(x) offsetof(XVContext, x)
static const AVOption options[] = {
{ "display_name", "set display name", OFFSET(display_name), AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, AV_OPT_FLAG_ENCODING_PARAM },
{ "window_size", "set window forced size", OFFSET(window_width), AV_OPT_TYPE_IMAGE_SIZE, {.str = NULL}, 0, 0, AV_OPT_FLAG_ENCODING_PARAM },
{ "window_title", "set window title", OFFSET(window_title), AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, AV_OPT_FLAG_ENCODING_PARAM },
{ "window_x", "set window x offset", OFFSET(window_x), AV_OPT_TYPE_INT, {.i64 = 0 }, -INT_MAX, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM },
{ "window_y", "set window y offset", OFFSET(window_y), AV_OPT_TYPE_INT, {.i64 = 0 }, -INT_MAX, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM },
{ NULL }
};
static const AVClass xv_class = {
.class_name = "xvideo outdev",
.item_name = av_default_item_name,
.option = options,
.version = LIBAVUTIL_VERSION_INT,
};
AVOutputFormat ff_xv_muxer = {
.name = "xv",
.long_name = NULL_IF_CONFIG_SMALL("XV (XVideo) output device"),
.priv_data_size = sizeof(XVContext),
.audio_codec = AV_CODEC_ID_NONE,
.video_codec = AV_CODEC_ID_RAWVIDEO,
.write_header = xv_write_header,
.write_packet = xv_write_packet,
.write_trailer = xv_write_trailer,
.flags = AVFMT_NOFILE | AVFMT_VARIABLE_FPS | AVFMT_NOTIMESTAMPS,
.priv_class = &xv_class,
};
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