img.c

Trolltech公司发布的图形界面操作系统。可在qt-embedded-2.3.7平台上编译为嵌入式图形界面操作系统。

        if (i == 1) {
            width >>= 1;
            height >>= 1;
        }

        p[1] = ext[i];
        if (url_fopen(pb, fname, URL_WRONLY) < 0)
            return -EIO;
    
        ptr = picture->data[i];
        for(j=0;j<height;j++) {
            put_buffer(pb, ptr, width);
            ptr += picture->linesize[i];
        }
        put_flush_packet(pb);
        url_fclose(pb);
    }
    return 0;
}

static int yuv4mpeg_save(AVPicture *picture, int width, int height, ByteIOContext *pb, int need_stream_header, 
                        int is_yuv, int raten, int rated, int aspectn, int aspectd) 
{
    int i, n, m;
    char buf[Y4M_LINE_MAX+1], buf1[20];
    UINT8 *ptr, *ptr1, *ptr2;
    
    /* construct stream header, if this is the first frame */
    if(need_stream_header) {
        n = snprintf(buf, sizeof(buf), "%s W%d H%d F%d:%d I%s A%d:%d\n",
                Y4M_MAGIC,
                width,
                height,
                raten, rated,
                "p",			/* ffmpeg seems to only output progressive video */
                aspectn, aspectd);
        if (n < 0) {
            fprintf(stderr, "Error. YUV4MPEG stream header write failed.\n");
        } else {
            fprintf(stderr, "YUV4MPEG stream header written. FPS is %d\n", raten);
            put_buffer(pb, buf, strlen(buf));
        }
    }
    
    /* construct frame header */
    m = snprintf(buf1, sizeof(buf1), "%s \n", Y4M_FRAME_MAGIC);
    if (m < 0) {
        fprintf(stderr, "Error. YUV4MPEG frame header write failed.\n");
    } else {
        /* fprintf(stderr, "YUV4MPEG frame header written.\n"); */
        put_buffer(pb, buf1, strlen(buf1));
    }
    
    ptr = picture->data[0];
    for(i=0;i<height;i++) {
        put_buffer(pb, ptr, width);
        ptr += picture->linesize[0];
    }

    if (is_yuv) {
        height >>= 1;
        width >>= 1;
        ptr1 = picture->data[1];
        ptr2 = picture->data[2];
        for(i=0;i<height;i++) {		/* Cb */
            put_buffer(pb, ptr1, width);
            ptr1 += picture->linesize[1];
        }
         for(i=0;i<height;i++) {	/* Cr */
            put_buffer(pb, ptr2, width);
            ptr2 += picture->linesize[2];
         }
    }
    put_flush_packet(pb);
    return 0;
}

static int img_write_header(AVFormatContext *s)
{
    VideoData *img = s->priv_data;

    img->img_number = 1;
    strcpy(img->path, s->filename);

    /* find format */
    if (s->oformat->flags & AVFMT_NOFILE)
        img->is_pipe = 0;
    else
        img->is_pipe = 1;
        
    if (s->oformat == &pgmyuvpipe_oformat ||
        s->oformat == &pgmyuv_oformat) {
        img->img_fmt = IMGFMT_PGMYUV;
    } else if (s->oformat == &pgmpipe_oformat ||
               s->oformat == &pgm_oformat) {
        img->img_fmt = IMGFMT_PGM;
    } else if (s->oformat == &imgyuv_oformat) {
        img->img_fmt = IMGFMT_YUV;
    } else if (s->oformat == &ppmpipe_oformat ||
               s->oformat == &ppm_oformat) {
        img->img_fmt = IMGFMT_PPM;
    } else if (s->oformat == &yuv4mpegpipe_oformat) {
        img->img_fmt = IMGFMT_YUV4MPEG;
        img->header_written = 0;    
    } else {
        goto fail;
    }
    return 0;
 fail:
    av_free(img);
    return -EIO;
}

static int img_write_packet(AVFormatContext *s, int stream_index,
                            UINT8 *buf, int size, int force_pts)
{
    VideoData *img = s->priv_data;
    AVStream *st = s->streams[stream_index];
    ByteIOContext pb1, *pb;
    AVPicture picture;
    int width, height, need_stream_header, ret, size1, raten, rated, aspectn, aspectd, fps, fps1;
    char filename[1024];

    width = st->codec.width;
    height = st->codec.height;
    
    if (img->img_number == 1) {
        need_stream_header = 1;
    } else {
        need_stream_header = 0;
    }
    
    fps = st->codec.frame_rate;
    fps1 = (((float)fps / FRAME_RATE_BASE) * 1000);
   
   /* Sorry about this messy code, but mpeg2enc is very picky about
    * the framerates it accepts. */
    switch(fps1) {
    case 23976:
        raten = 24000; /* turn the framerate into a ratio */
        rated = 1001;
        break;
    case 29970:
        raten = 30000;
        rated = 1001;
        break;
    case 25000:
        raten = 25;
        rated = 1;
        break;
    case 30000:
        raten = 30;
        rated = 1;
        break;
    case 24000:
        raten = 24;
        rated = 1;
        break;
    case 50000:
        raten = 50;
        rated = 1;
        break;
    case 59940:
        raten = 60000;
        rated = 1001;
        break;
    case 60000:
        raten = 60;
        rated = 1;
        break;
    default:
        raten = fps1; /* this setting should work, but often doesn't */
        rated = 1000;
        break;
    }
    
    aspectn = 1;
    aspectd = 1;	/* ffmpeg always uses a 1:1 aspect ratio */

    switch(st->codec.pix_fmt) {
    case PIX_FMT_YUV420P:
        size1 = (width * height * 3) / 2;
        if (size != size1)
            return -EIO;
        
        picture.data[0] = buf;
        picture.data[1] = picture.data[0] + width * height;
        picture.data[2] = picture.data[1] + (width * height) / 4;
        picture.linesize[0] = width;
        picture.linesize[1] = width >> 1; 
        picture.linesize[2] = width >> 1;
        break;
    case PIX_FMT_RGB24:
        size1 = (width * height * 3);
        if (size != size1)
            return -EIO;
        picture.data[0] = buf;
        picture.linesize[0] = width * 3;
        break;
    default:
        return -EIO;
    }
    
/*
    This if-statement destroys pipes - I do not see why it is necessary
    if (get_frame_filename(filename, sizeof(filename), 
                           img->path, img->img_number) < 0)
        return -EIO;
*/
    get_frame_filename(filename, sizeof(filename), 
                       img->path, img->img_number);
    if (!img->is_pipe) {
        pb = &pb1;
        if (url_fopen(pb, filename, URL_WRONLY) < 0)
            return -EIO;
    } else {
        pb = &s->pb;
    }
    switch(img->img_fmt) {
    case IMGFMT_PGMYUV:
        ret = pgm_save(&picture, width, height, pb, 1);
        break;
    case IMGFMT_PGM:
        ret = pgm_save(&picture, width, height, pb, 0);
        break;
    case IMGFMT_YUV:
        ret = yuv_save(&picture, width, height, filename);
        break;
    case IMGFMT_PPM:
        ret = ppm_save(&picture, width, height, pb);
        break;
    case IMGFMT_YUV4MPEG:
         ret = yuv4mpeg_save(&picture, width, height, pb,
         need_stream_header, 1, raten, rated, aspectn, aspectd);
        break;
    }
    if (!img->is_pipe) {
        url_fclose(pb);
    }

    img->img_number++;
    return 0;
}

static int img_write_trailer(AVFormatContext *s)
{
    return 0;
}

static AVInputFormat pgm_iformat = {
    "pgm",
    "pgm image format",
    sizeof(VideoData),
    NULL,
    img_read_header,
    img_read_packet,
    img_read_close,
    NULL,
    AVFMT_NOFILE | AVFMT_NEEDNUMBER,
    .extensions = "pgm",
};

static AVOutputFormat pgm_oformat = {
    "pgm",
    "pgm image format",
    "",
    "pgm",
    sizeof(VideoData),
    CODEC_ID_NONE,
    CODEC_ID_RAWVIDEO,
    img_write_header,
    img_write_packet,
    img_write_trailer,
    AVFMT_NOFILE | AVFMT_NEEDNUMBER,
};

static AVInputFormat pgmyuv_iformat = {
    "pgmyuv",
    "pgm with YUV content image format",
    sizeof(VideoData),
    NULL, /* no probe */
    img_read_header,
    img_read_packet,
    img_read_close,
    NULL,
    AVFMT_NOFILE | AVFMT_NEEDNUMBER,
};

static AVOutputFormat pgmyuv_oformat = {
    "pgmyuv",
    "pgm with YUV content image format",
    "",
    "pgm",
    sizeof(VideoData),
    CODEC_ID_NONE,
    CODEC_ID_RAWVIDEO,
    img_write_header,
    img_write_packet,
    img_write_trailer,
    AVFMT_NOFILE | AVFMT_NEEDNUMBER,
};

static AVInputFormat ppm_iformat = {
    "ppm",
    "ppm image format",
    sizeof(VideoData),
    NULL,
    img_read_header,
    img_read_packet,
    img_read_close,
    NULL,
    AVFMT_NOFILE | AVFMT_NEEDNUMBER | AVFMT_RGB24,
    .extensions = "ppm",
};

static AVOutputFormat ppm_oformat = {
    "ppm",
    "ppm image format",
    "",
    "ppm",
    sizeof(VideoData),
    CODEC_ID_NONE,
    CODEC_ID_RAWVIDEO,
    img_write_header,
    img_write_packet,
    img_write_trailer,
    AVFMT_NOFILE | AVFMT_NEEDNUMBER | AVFMT_RGB24,
};

static AVInputFormat imgyuv_iformat = {
    ".Y.U.V",
    ".Y.U.V format",
    sizeof(VideoData),
    NULL,
    img_read_header,
    img_read_packet,
    img_read_close,
    NULL,
    AVFMT_NOFILE | AVFMT_NEEDNUMBER,
    .extensions = "Y",
};

static AVOutputFormat imgyuv_oformat = {
    ".Y.U.V",
    ".Y.U.V format",
    "",
    "Y",
    sizeof(VideoData),
    CODEC_ID_NONE,
    CODEC_ID_RAWVIDEO,
    img_write_header,
    img_write_packet,
    img_write_trailer,
    AVFMT_NOFILE | AVFMT_NEEDNUMBER,
};

static AVInputFormat pgmpipe_iformat = {
    "pgmpipe",
    "PGM pipe format",
    sizeof(VideoData),
    NULL, /* no probe */
    img_read_header,
    img_read_packet,
    img_read_close,
    NULL,
};

static AVOutputFormat pgmpipe_oformat = {
    "pgmpipe",
    "PGM pipe format",
    "",
    "pgm",
    sizeof(VideoData),
    CODEC_ID_NONE,
    CODEC_ID_RAWVIDEO,
    img_write_header,
    img_write_packet,
    img_write_trailer,
};

static AVInputFormat pgmyuvpipe_iformat = {
    "pgmyuvpipe",
    "PGM YUV pipe format",
    sizeof(VideoData),
    NULL, /* no probe */
    img_read_header,
    img_read_packet,
    img_read_close,
    NULL,
};

static AVOutputFormat pgmyuvpipe_oformat = {
    "pgmyuvpipe",
    "PGM YUV pipe format",
    "",
    "pgm",
    sizeof(VideoData),
    CODEC_ID_NONE,
    CODEC_ID_RAWVIDEO,
    img_write_header,
    img_write_packet,
    img_write_trailer,
};

static AVInputFormat ppmpipe_iformat = {
    "ppmpipe",
    "PPM pipe format",
    sizeof(VideoData),
    NULL, /* no probe */
    img_read_header,
    img_read_packet,
    img_read_close,
    NULL,
    .flags = AVFMT_RGB24,
};

static AVOutputFormat ppmpipe_oformat = {
    "ppmpipe",
    "PPM pipe format",
    "",
    "ppm",
    sizeof(VideoData),
    CODEC_ID_NONE,
    CODEC_ID_RAWVIDEO,
    img_write_header,
    img_write_packet,
    img_write_trailer,
    .flags = AVFMT_RGB24,
};


static AVOutputFormat yuv4mpegpipe_oformat = {
    "yuv4mpegpipe",
    "YUV4MPEG pipe format",
    "",
    "yuv4mpeg",
    sizeof(VideoData),
    CODEC_ID_NONE,
    CODEC_ID_RAWVIDEO,
    img_write_header,
    img_write_packet,
    img_write_trailer,
};


int img_init(void)
{
    av_register_input_format(&pgm_iformat);
    av_register_output_format(&pgm_oformat);

    av_register_input_format(&pgmyuv_iformat);
    av_register_output_format(&pgmyuv_oformat);

    av_register_input_format(&ppm_iformat);
    av_register_output_format(&ppm_oformat);

    av_register_input_format(&imgyuv_iformat);
    av_register_output_format(&imgyuv_oformat);
    
    av_register_input_format(&pgmpipe_iformat);
    av_register_output_format(&pgmpipe_oformat);

    av_register_input_format(&pgmyuvpipe_iformat);
    av_register_output_format(&pgmyuvpipe_oformat);

    av_register_input_format(&ppmpipe_iformat);
    av_register_output_format(&ppmpipe_oformat);
       
    av_register_output_format(&yuv4mpegpipe_oformat);
    
    return 0;
}