noise.c

linux下的MPEG1

    if (fp->shiftptr == 3) fp->shiftptr = 0;
}



/* plugin class initialization function */
void *noise_init_plugin(xine_t *xine, void *);

typedef struct post_plugin_noise_s post_plugin_noise_t;

/*
 * this is the struct used by "parameters api" 
 */
typedef struct noise_parameters_s {
    int luma_strength, chroma_strength,
        type, quality, pattern;
} noise_parameters_t;

static char *enum_types[] = {"uniform", "gaussian", NULL};
static char *enum_quality[] = {"fixed", "temporal", "averaged temporal", NULL};

/*
 * description of params struct
 */
START_PARAM_DESCR( noise_parameters_t )
PARAM_ITEM( POST_PARAM_TYPE_INT, luma_strength, NULL, 0, 100, 0, 
    "Amount of noise to add to luma channel" )
PARAM_ITEM( POST_PARAM_TYPE_INT, chroma_strength, NULL, 0, 100, 0,   
    "Amount of noise to add to chroma channel" )
PARAM_ITEM( POST_PARAM_TYPE_INT, quality, enum_quality, 0, 0, 0, 
    "Quality level of noise" )
PARAM_ITEM( POST_PARAM_TYPE_INT, type, enum_types, 0, 0, 0, 
    "Type of noise" )
PARAM_ITEM( POST_PARAM_TYPE_BOOL, pattern, NULL, 0, 1, 0, 
    "Mix random noise with a (semi)regular pattern" )
END_PARAM_DESCR( param_descr )


/* plugin structure */
struct post_plugin_noise_s {
  post_plugin_t post;

  /* private data */
  noise_param_t params[2]; // luma and chroma
  xine_post_in_t     params_input;

  pthread_mutex_t    lock;
};


static int set_parameters (xine_post_t *this_gen, void *param_gen) 
{
    post_plugin_noise_t *this = (post_plugin_noise_t *)this_gen;
    noise_parameters_t *param = (noise_parameters_t *)param_gen;
    int i;

    pthread_mutex_lock (&this->lock);
    for (i = 0; i < 2; i++) {
        this->params[i].uniform = (param->type == 0);
        this->params[i].temporal = (param->quality >= 1);
        this->params[i].averaged = (param->quality == 2);
        this->params[i].quality = 1;
        this->params[i].pattern = param->pattern;
    }
    this->params[0].strength = param->luma_strength;
    this->params[1].strength = param->chroma_strength;
    pthread_mutex_unlock (&this->lock);
    initNoise(&this->params[0]);
    initNoise(&this->params[1]);
    return 1;
}

static int get_parameters (xine_post_t *this_gen, void *param_gen) 
{
    post_plugin_noise_t *this = (post_plugin_noise_t *)this_gen;
    noise_parameters_t *param = (noise_parameters_t *)param_gen;

    pthread_mutex_lock (&this->lock);
    param->type = (this->params[0].uniform == 0);
    if (this->params[0].averaged)
        param->quality = 2;
    else if (this->params[0].temporal)
        param->quality = 1;
    else
        param->quality = 0;
    param->pattern = this->params[0].pattern;
    param->luma_strength = this->params[0].strength;
    param->chroma_strength = this->params[1].strength;
    pthread_mutex_unlock (&this->lock);
    return 1;
}
 
static xine_post_api_descr_t *get_param_descr (void) {
    return &param_descr;
}

static char *get_help (void) {
  return _("Adds random noise to the video.\n"
           "\n"
           "Parameters:\n"
           "  luma_strength: strength of noise added to luma channel "
           "(0-100, default: 8)\n"
           "  chroma_strength: strength of noise added to chroma channel "
           "(0-100, default: 5)\n"
           "  quality: quality level of the noise.  fixed: constant noise "
           "pattern; temporal: noise pattern changes between frames; "
           "averaged temporal: smoother noise pattern that changes between "
           "frames.  (default: averaged temporal)\n"
           "  type: Type of noise: uniform or gaussian.  (default: "
           "gaussian)\n"
           "  pattern: Mix random noise with a (semi)regular pattern. "
           "(default: False)\n"
           "\n"
           "* mplayer's noise (C) Michael Niedermayer\n"
           );
}

static xine_post_api_t post_api = {
    set_parameters,
    get_parameters,
    get_param_descr,
    get_help,
};


/* plugin class functions */
static post_plugin_t *noise_open_plugin(post_class_t *class_gen, int inputs,
                     xine_audio_port_t **audio_target,
                     xine_video_port_t **video_target);
static char          *noise_get_identifier(post_class_t *class_gen);
static char          *noise_get_description(post_class_t *class_gen);
static void           noise_class_dispose(post_class_t *class_gen);

/* plugin instance functions */
static void           noise_dispose(post_plugin_t *this_gen);

/* frame intercept check */
static int            noise_intercept_frame(post_video_port_t *port, vo_frame_t *frame);

/* replaced vo_frame functions */
static int            noise_draw(vo_frame_t *frame, xine_stream_t *stream);


void *noise_init_plugin(xine_t *xine, void *data)
{
    post_class_t *class = (post_class_t *)malloc(sizeof(post_class_t));

    if (!class)
        return NULL;
  
    class->open_plugin     = noise_open_plugin;
    class->get_identifier  = noise_get_identifier;
    class->get_description = noise_get_description;
    class->dispose         = noise_class_dispose;

#ifdef ARCH_X86
    if (xine_mm_accel() & MM_ACCEL_X86_MMX) {
        lineNoise = lineNoise_MMX;
        lineNoiseAvg = lineNoiseAvg_MMX;
    } else if (xine_mm_accel() & MM_ACCEL_X86_MMXEXT) {
        lineNoise = lineNoise_MMX2;
    }
#endif
    return class;
}


static post_plugin_t *noise_open_plugin(post_class_t *class_gen, int inputs,
                     xine_audio_port_t **audio_target,
                     xine_video_port_t **video_target)
{
    post_plugin_noise_t *this = (post_plugin_noise_t *)xine_xmalloc(sizeof(post_plugin_noise_t));
    post_in_t         *input;
    xine_post_in_t    *input_api;
    post_out_t        *output;
    post_video_port_t *port;
    noise_parameters_t params;
    
    if (!this || !video_target || !video_target[0]) {
      free(this);
      return NULL;
    }
    
    _x_post_init(&this->post, 0, 1);

    memset(&params, 0, sizeof(noise_parameters_t));
    params.luma_strength = 8;
    params.chroma_strength = 5;
    params.type = 1;
    params.quality = 2;

    pthread_mutex_init(&this->lock, NULL);
    
    port = _x_post_intercept_video_port(&this->post, video_target[0], &input, &output);
    port->intercept_frame       = noise_intercept_frame;
    port->new_frame->draw       = noise_draw;
    
    input_api       = &this->params_input;
    input_api->name = "parameters";
    input_api->type = XINE_POST_DATA_PARAMETERS;
    input_api->data = &post_api;
    xine_list_push_back(this->post.input, input_api);

    input->xine_in.name     = "video";
    output->xine_out.name   = "filtered video";
    
    this->post.xine_post.video_input[0] = &port->new_port;
    
    this->post.dispose = noise_dispose;

    set_parameters ((xine_post_t *)this, &params);
    
    return &this->post;
}

static char *noise_get_identifier(post_class_t *class_gen)
{
    return "noise";
}

static char *noise_get_description(post_class_t *class_gen)
{
    return "Adds noise";
}

static void noise_class_dispose(post_class_t *class_gen)
{
    free(class_gen);
}


static void noise_dispose(post_plugin_t *this_gen)
{
    post_plugin_noise_t *this = (post_plugin_noise_t *)this_gen;

    if (_x_post_dispose(this_gen)) {
        pthread_mutex_destroy(&this->lock);
        free(this);
    }
}


static int noise_intercept_frame(post_video_port_t *port, vo_frame_t *frame)
{
    return (frame->format == XINE_IMGFMT_YV12 || frame->format == XINE_IMGFMT_YUY2);
}


static int noise_draw(vo_frame_t *frame, xine_stream_t *stream)
{
    post_video_port_t *port = (post_video_port_t *)frame->port;
    post_plugin_noise_t *this = (post_plugin_noise_t *)port->post;
    vo_frame_t *out_frame;
    int skip;

    if (frame->bad_frame || 
        (this->params[0].strength == 0 && this->params[1].strength == 0)) {
        _x_post_frame_copy_down(frame, frame->next);
        skip = frame->next->draw(frame->next, stream);
        _x_post_frame_copy_up(frame, frame->next);
        return skip;
    }

    frame->lock(frame);
    out_frame = port->original_port->get_frame(port->original_port,
        frame->width, frame->height, frame->ratio, frame->format, 
        frame->flags | VO_BOTH_FIELDS);

    _x_post_frame_copy_down(frame, out_frame);
    pthread_mutex_lock (&this->lock);

    if (frame->format == XINE_IMGFMT_YV12) {
        noise(out_frame->base[0], frame->base[0], 
              out_frame->pitches[0], frame->pitches[0], 
              frame->width, frame->height, &this->params[0]);
        noise(out_frame->base[1], frame->base[1], 
              out_frame->pitches[1], frame->pitches[1], 
              frame->width/2, frame->height/2, &this->params[1]);
        noise(out_frame->base[2], frame->base[2], 
              out_frame->pitches[2], frame->pitches[2], 
              frame->width/2, frame->height/2, &this->params[1]);
    } else {
        // Chroma strength is ignored for YUY2.
        noise(out_frame->base[0], frame->base[0], 
              out_frame->pitches[0], frame->pitches[0], 
              frame->width * 2, frame->height, &this->params[0]);
    }

#ifdef ARCH_X86
    if (xine_mm_accel() & MM_ACCEL_X86_MMX)
        asm volatile ("emms\n\t");
    if (xine_mm_accel() & MM_ACCEL_X86_MMXEXT)
        asm volatile ("sfence\n\t");
#endif

    pthread_mutex_unlock (&this->lock);
    skip = out_frame->draw(out_frame, stream);
    _x_post_frame_copy_up(frame, out_frame);

    out_frame->free(out_frame);
    frame->free(frame);
    return skip;
}