source: mediastreamer2/linphone/mediastreamer2/src/nowebcam.c @ 55:76c9c25985d2

/*
mediastreamer2 library - modular sound and video processing and streaming
Copyright (C) 2006  Simon MORLAT (simon.morlat@linphone.org)

This program 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.

This program 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 this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
*/

#ifdef HAVE_CONFIG_H
#include "mediastreamer-config.h"
#endif

#include "mediastreamer2/mscommon.h"
#include "mediastreamer2/msvideo.h"
#include "mediastreamer2/msfilter.h"
#include "mediastreamer2/msticker.h"
#include "mediastreamer2/mswebcam.h"

#include "ffmpeg-priv.h"

#include <sys/stat.h>

#ifdef WIN32
#include <fcntl.h>
#include <sys/types.h>
#include <io.h>
#include <stdio.h>
#include <malloc.h>
#endif

static mblk_t *jpeg2yuv(uint8_t *jpgbuf, int bufsize, MSVideoSize *reqsize){
        AVCodecContext av_context;
        int got_picture=0;
        AVFrame orig;
        AVPicture dest;
        mblk_t *ret;
        struct SwsContext *sws_ctx;

        avcodec_get_context_defaults(&av_context);
        if (avcodec_open(&av_context,avcodec_find_decoder(CODEC_ID_MJPEG))<0){
                ms_error("jpeg2yuv: avcodec_open failed");
                return NULL;
        }
        if (avcodec_decode_video(&av_context,&orig,&got_picture,jpgbuf,bufsize)<0){
                ms_error("jpeg2yuv: avcodec_decode_video failed");
                avcodec_close(&av_context);
                return NULL;
        }
        ret=allocb(avpicture_get_size(PIX_FMT_YUV420P,reqsize->width,reqsize->height),0);
        ret->b_wptr=ret->b_datap->db_lim;
        avpicture_fill(&dest,ret->b_rptr,PIX_FMT_YUV420P,reqsize->width,reqsize->height);
        
        sws_ctx=sws_getContext(av_context.width,av_context.height,PIX_FMT_YUV420P,
                reqsize->width,reqsize->height,PIX_FMT_YUV420P,SWS_FAST_BILINEAR,
                NULL, NULL, NULL);
        if (sws_scale(sws_ctx,orig.data,orig.linesize,0,av_context.height,dest.data,dest.linesize)<0){
                ms_error("jpeg2yuv: sws_scale() failed.");
        }
        sws_freeContext(sws_ctx);
        avcodec_close(&av_context);
        return ret;
}

mblk_t *ms_load_jpeg_as_yuv(const char *jpgpath, MSVideoSize *reqsize){
        mblk_t *m=NULL;
        struct stat statbuf;
        uint8_t *jpgbuf;
#if !defined(_MSC_VER)
        int fd=open(jpgpath,O_RDONLY);
#else
        int fd=_open(jpgpath,O_RDONLY);
#endif
        if (fd!=-1){
                fstat(fd,&statbuf);
                jpgbuf=(uint8_t*)alloca(statbuf.st_size);
#if !defined(_MSC_VER)
                read(fd,jpgbuf,statbuf.st_size);
#else
                _read(fd,jpgbuf,statbuf.st_size);
#endif
                m=jpeg2yuv(jpgbuf,statbuf.st_size,reqsize);
        }else{
                ms_error("Cannot load %s",jpgpath);
        }
        return m;
}

#ifndef PACKAGE_DATA_DIR
#define PACKAGE_DATA_DIR "."
#endif

#ifndef NOWEBCAM_JPG
#define NOWEBCAM_JPG "nowebcamCIF"
#endif

mblk_t *ms_load_nowebcam(MSVideoSize *reqsize, int idx){
        char tmp[256];
        if (idx<0)
                snprintf(tmp, sizeof(tmp), "%s/images/%s.jpg", PACKAGE_DATA_DIR, NOWEBCAM_JPG);
        else
                snprintf(tmp, sizeof(tmp), "%s/images/%s%i.jpg", PACKAGE_DATA_DIR, NOWEBCAM_JPG, idx);
        return ms_load_jpeg_as_yuv(tmp,reqsize);
}

typedef struct _SIData{
        MSVideoSize vsize;
        int index;
        uint64_t lasttime;
        mblk_t *pic;
}SIData;

void static_image_init(MSFilter *f){
        SIData *d=(SIData*)ms_new(SIData,1);
        d->vsize.width=MS_VIDEO_SIZE_CIF_W;
        d->vsize.height=MS_VIDEO_SIZE_CIF_H;
        d->index=-1;
        d->lasttime=0;
        d->pic=NULL;
        f->data=d;
}

void static_image_uninit(MSFilter *f){
        ms_free(f->data);
}

void static_image_preprocess(MSFilter *f){
        SIData *d=(SIData*)f->data;
        d->pic=ms_load_nowebcam(&d->vsize,d->index);
}

void static_image_process(MSFilter *f){
        SIData *d=(SIData*)f->data;
        /*output a frame every second*/
        if ((f->ticker->time - d->lasttime>1000) || d->lasttime==0){
                if (d->pic) {
                        mblk_t *o=dupb(d->pic);
                        /*prevent mirroring at the output*/
                        mblk_set_precious_flag(o,1);
                        ms_queue_put(f->outputs[0],o);
                }
                d->lasttime=f->ticker->time;
        }
}

void static_image_postprocess(MSFilter *f){
        SIData *d=(SIData*)f->data;
        if (d->pic) {
                freemsg(d->pic);
                d->pic=NULL;
        }
}

int static_image_set_vsize(MSFilter *f, void* data){
        SIData *d=(SIData*)f->data;
        d->vsize=*(MSVideoSize*)data;
        return 0;
}

int static_image_get_pix_fmt(MSFilter *f, void *data){
        *(MSPixFmt*)data=MS_YUV420P;
        return 0;
}

MSFilterMethod static_image_methods[]={
        {       MS_FILTER_SET_VIDEO_SIZE, static_image_set_vsize },
        {       MS_FILTER_GET_PIX_FMT, static_image_get_pix_fmt },
        {       0,0 }
};

MSFilterDesc ms_static_image_desc={
        MS_STATIC_IMAGE_ID,
        "MSStaticImage",
        "A filter that outputs a static image.",
        MS_FILTER_OTHER,
        NULL,
        0,
        1,
        static_image_init,
        static_image_preprocess,
        static_image_process,
        static_image_postprocess,
        static_image_uninit,
        static_image_methods
};

MS_FILTER_DESC_EXPORT(ms_static_image_desc)

static void static_image_detect(MSWebCamManager *obj);

static void static_image_cam_init(MSWebCam *cam){
        cam->name=ms_strdup("Static picture");
}


static MSFilter *static_image_create_reader(MSWebCam *obj){
        return ms_filter_new_from_desc(&ms_static_image_desc);
}

MSWebCamDesc static_image_desc={
        "StaticImage",
        &static_image_detect,
        &static_image_cam_init,
        &static_image_create_reader,
        NULL
};

static void static_image_detect(MSWebCamManager *obj){
        MSWebCam *cam=ms_web_cam_new(&static_image_desc);
        ms_web_cam_manager_add_cam(obj,cam);
}