diff options
author | Stefano Sabatini <stefasab@gmail.com> | 2012-04-07 15:26:51 +0400 |
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committer | Stefano Sabatini <stefasab@gmail.com> | 2012-04-07 15:57:39 +0400 |
commit | 6cb01c9dba7c1e89b8e7e2077ef62b9efd1fb6a7 (patch) | |
tree | 4dd8719996ef11a932766f15b68e88d1e70cf5be /libavfilter/libmpcodecs | |
parent | 2f83681c79a7419bec14ed6f40bf3a69b5dd16c2 (diff) |
lavfi/mp: remove remove_logo wrapper
removelogo has been ported to libavfilter, and the wrapper was not
working.
Diffstat (limited to 'libavfilter/libmpcodecs')
-rw-r--r-- | libavfilter/libmpcodecs/vf_remove_logo.c | 906 |
1 files changed, 0 insertions, 906 deletions
diff --git a/libavfilter/libmpcodecs/vf_remove_logo.c b/libavfilter/libmpcodecs/vf_remove_logo.c deleted file mode 100644 index a970adc5b0..0000000000 --- a/libavfilter/libmpcodecs/vf_remove_logo.c +++ /dev/null @@ -1,906 +0,0 @@ -/* - * This filter loads a .pgm mask file showing where a logo is and uses - * a blur transform to remove the logo. - * - * Copyright (C) 2005 Robert Edele <yartrebo@earthlink.net> - * - * This file is part of MPlayer. - * - * MPlayer 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. - * - * MPlayer 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 MPlayer; if not, write to the Free Software Foundation, Inc., - * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. - */ - -/** - * \file - * - * \brief Advanced blur-based logo removing filter. - - * Hello and welcome. This code implements a filter to remove annoying TV - * logos and other annoying images placed onto a video stream. It works by filling - * in the pixels that comprise the logo with neighboring pixels. The transform is - * very loosely based on a gaussian blur, but it is different enough to merit its - * own paragraph later on. It is a major improvement on the old delogo filter as - * it both uses a better blurring algorithm and uses a bitmap to use an arbitrary - * and generally much tighter fitting shape than a rectangle. - * - * The filter requires 1 argument and has no optional arguments. It requires - * a filter bitmap, which must be in PGM or PPM format. A sample invocation would - * be -vf remove_logo=/home/username/logo_bitmaps/xyz.pgm. Pixels with a value of - * zero are not part of the logo, and non-zero pixels are part of the logo. If you - * use white (255) for the logo and black (0) for the rest, you will be safe. For - * making the filter bitmap, I recommend taking a screen capture of a black frame - * with the logo visible, and then using The GIMP's threshold filter followed by - * the erode filter once or twice. If needed, little splotches can be fixed - * manually. Remember that if logo pixels are not covered, the filter quality will - * be much reduced. Marking too many pixels as part of the logo doesn't hurt as - * much, but it will increase the amount of blurring needed to cover over the - * image and will destroy more information than necessary. Additionally, this blur - * algorithm is O(n) = n^4, where n is the width and height of a hypothetical - * square logo, so extra pixels will slow things down on a large lo - * - * The logo removal algorithm has two key points. The first is that it - * distinguishes between pixels in the logo and those not in the logo by using the - * passed-in bitmap. Pixels not in the logo are copied over directly without being - * modified and they also serve as source pixels for the logo fill-in. Pixels - * inside the logo have the mask applied. - * - * At init-time the bitmap is reprocessed internally, and the distance to the - * nearest edge of the logo (Manhattan distance), along with a little extra to - * remove rough edges, is stored in each pixel. This is done using an in-place - * erosion algorithm, and incrementing each pixel that survives any given erosion. - * Once every pixel is eroded, the maximum value is recorded, and a set of masks - * from size 0 to this size are generaged. The masks are circular binary masks, - * where each pixel within a radius N (where N is the size of the mask) is a 1, - * and all other pixels are a 0. Although a gaussian mask would be more - * mathematically accurate, a binary mask works better in practice because we - * generally do not use the central pixels in the mask (because they are in the - * logo region), and thus a gaussian mask will cause too little blur and thus a - * very unstable image. - * - * The mask is applied in a special way. Namely, only pixels in the mask that - * line up to pixels outside the logo are used. The dynamic mask size means that - * the mask is just big enough so that the edges touch pixels outside the logo, so - * the blurring is kept to a minimum and at least the first boundary condition is - * met (that the image function itself is continuous), even if the second boundary - * condition (that the derivative of the image function is continuous) is not met. - * A masking algorithm that does preserve the second boundary coundition - * (perhaps something based on a highly-modified bi-cubic algorithm) should offer - * even better results on paper, but the noise in a typical TV signal should make - * anything based on derivatives hopelessly noisy. - */ - -#include <stdio.h> -#include <stdlib.h> -#include <string.h> -#include <ctype.h> -#include <inttypes.h> - -#include "config.h" -#include "mp_msg.h" -#include "libvo/fastmemcpy.h" - -#include "img_format.h" -#include "mp_image.h" -#include "vf.h" - -//===========================================================================// - -/** \brief Returns the larger of the two arguments. **/ -#define max(x,y) ((x)>(y)?(x):(y)) -/** \brief Returns the smaller of the two arguments. **/ -#define min(x,y) ((x)>(y)?(y):(x)) - -/** - * \brief Test if a pixel is part of the logo. - */ -#define test_filter(image, x, y) ((unsigned char) (image->pixel[((y) * image->width) + (x)])) - -/** - * \brief Chooses a slightly larger mask size to improve performance. - * - * This function maps the absolute minimum mask size needed to the mask size we'll - * actually use. f(x) = x (the smallest that will work) will produce the sharpest - * results, but will be quite jittery. f(x) = 1.25x (what I'm using) is a good - * tradeoff in my opinion. This will calculate only at init-time, so you can put a - * long expression here without effecting performance. - */ -#define apply_mask_fudge_factor(x) (((x) >> 2) + x) - -/** - * \brief Simple implementation of the PGM image format. - * - * This struct holds a bare-bones image loaded from a PGM or PPM file. Once - * loaded and pre-processed, each pixel in this struct will contain how far from - * the edge of the logo each pixel is, using the manhattan distance (|dx| + |dy|). - * - * pixels in char * pixel can be addressed using (y * width) + height. - */ -typedef struct -{ - unsigned int width; - unsigned int height; - - unsigned char * pixel; - -} pgm_structure; - -/** - * \brief Stores persistant variables. - * - * Variables stored here are kept from frame to frame, and separate instances of - * the filter will get their own separate copies. - */ -struct vf_priv_s -{ - unsigned int fmt; /* Not exactly sure of the use for this. It came with the example filter I used as a basis for this, and it looks like a lot of stuff will break if I remove it. */ - int max_mask_size; /* The largest possible mask size that will be needed with the given filter and corresponding half_size_filter. The half_size_filter can have a larger requirment in some rare (but not degenerate) cases. */ - int * * * mask; /* Stores our collection of masks. The first * is for an array of masks, the second for the y axis, and the third for the x axis. */ - pgm_structure * filter; /* Stores the full-size filter image. This is used to tell what pixels are in the logo or not in the luma plane. */ - pgm_structure * half_size_filter; /* Stores a 50% width and 50% height filter image. This is used to tell what pixels are in the logo or not in the chroma planes. */ - /* These 8 variables store the bounding rectangles that the logo resides in. */ - int bounding_rectangle_posx1; - int bounding_rectangle_posy1; - int bounding_rectangle_posx2; - int bounding_rectangle_posy2; - int bounding_rectangle_half_size_posx1; - int bounding_rectangle_half_size_posy1; - int bounding_rectangle_half_size_posx2; - int bounding_rectangle_half_size_posy2; -} vf_priv_s; - -/** - * \brief Mallocs memory and checks to make sure it succeeded. - * - * \param size How many bytes to allocate. - * - * \return A pointer to the freshly allocated memory block, or NULL on failutre. - * - * Mallocs memory, and checks to make sure it was successfully allocated. Because - * of how MPlayer works, it cannot safely halt execution, but at least the user - * will get an error message before the segfault happens. - */ -static void * safe_malloc(int size) -{ - void * answer = malloc(size); - if (answer == NULL) - mp_msg(MSGT_VFILTER, MSGL_ERR, "Unable to allocate memory in vf_remove_logo.c\n"); - - return answer; -} - -/** - * \brief Calculates the smallest rectangle that will encompass the logo region. - * - * \param filter This image contains the logo around which the rectangle will - * will be fitted. - * - * The bounding rectangle is calculated by testing successive lines (from the four - * sides of the rectangle) until no more can be removed without removing logo - * pixels. The results are returned by reference to posx1, posy1, posx2, and - * posy2. - */ -static void calculate_bounding_rectangle(int * posx1, int * posy1, int * posx2, int * posy2, pgm_structure * filter) -{ - int x; /* Temporary variables to run */ - int y; /* through each row or column. */ - int start_x; - int start_y; - int end_x = filter->width - 1; - int end_y = filter->height - 1; - int did_we_find_a_logo_pixel = 0; - - /* Let's find the top bound first. */ - for (start_x = 0; start_x < filter->width && !did_we_find_a_logo_pixel; start_x++) - { - for (y = 0; y < filter->height; y++) - { - did_we_find_a_logo_pixel |= test_filter(filter, start_x, y); - } - } - start_x--; - - /* Now the bottom bound. */ - did_we_find_a_logo_pixel = 0; - for (end_x = filter->width - 1; end_x > start_x && !did_we_find_a_logo_pixel; end_x--) - { - for (y = 0; y < filter->height; y++) - { - did_we_find_a_logo_pixel |= test_filter(filter, end_x, y); - } - } - end_x++; - - /* Left bound. */ - did_we_find_a_logo_pixel = 0; - for (start_y = 0; start_y < filter->height && !did_we_find_a_logo_pixel; start_y++) - { - for (x = 0; x < filter->width; x++) - { - did_we_find_a_logo_pixel |= test_filter(filter, x, start_y); - } - } - start_y--; - - /* Right bound. */ - did_we_find_a_logo_pixel = 0; - for (end_y = filter->height - 1; end_y > start_y && !did_we_find_a_logo_pixel; end_y--) - { - for (x = 0; x < filter->width; x++) - { - did_we_find_a_logo_pixel |= test_filter(filter, x, end_y); - } - } - end_y++; - - *posx1 = start_x; - *posy1 = start_y; - *posx2 = end_x; - *posy2 = end_y; - - return; -} - -/** - * \brief Free mask memory. - * - * \param vf Data structure which stores our persistant data, and is to be freed. - * - * We call this function when our filter is done. It will free the memory - * allocated to the masks and leave the variables in a safe state. - */ -static void destroy_masks(vf_instance_t * vf) -{ - int a, b; - - /* Load values from the vf->priv struct for faster dereferencing. */ - int * * * mask = vf->priv->mask; - int max_mask_size = vf->priv->max_mask_size; - - if (mask == NULL) - return; /* Nothing allocated, so return before we segfault. */ - - /* Free all allocated memory. */ - for (a = 0; a <= max_mask_size; a++) /* Loop through each mask. */ - { - for (b = -a; b <= a; b++) /* Loop through each scanline in a mask. */ - { - free(mask[a][b + a]); /* Free a scanline. */ - } - free(mask[a]); /* Free a mask. */ - } - free(mask); /* Free the array of pointers pointing to the masks. */ - - /* Set the pointer to NULL, so that any duplicate calls to this function will not cause a crash. */ - vf->priv->mask = NULL; - - return; -} - -/** - * \brief Set up our array of masks. - * - * \param vf Where our filter stores persistance data, like these masks. - * - * This creates an array of progressively larger masks and calculates their - * values. The values will not change during program execution once this function - * is done. - */ -static void initialize_masks(vf_instance_t * vf) -{ - int a, b, c; - - /* Load values from the vf->priv struct for faster dereferencing. */ - int * * * mask = vf->priv->mask; - int max_mask_size = vf->priv->max_mask_size; /* This tells us how many masks we'll need to generate. */ - - /* Create a circular mask for each size up to max_mask_size. When the filter is applied, the mask size is - determined on a pixel by pixel basis, with pixels nearer the edge of the logo getting smaller mask sizes. */ - mask = (int * * *) safe_malloc(sizeof(int * *) * (max_mask_size + 1)); - for (a = 0; a <= max_mask_size; a++) - { - mask[a] = (int * *) safe_malloc(sizeof(int *) * ((a * 2) + 1)); - for (b = -a; b <= a; b++) - { - mask[a][b + a] = (int *) safe_malloc(sizeof(int) * ((a * 2) + 1)); - for (c = -a; c <= a; c++) - { - if ((b * b) + (c * c) <= (a * a)) /* Circular 0/1 mask. */ - mask[a][b + a][c + a] = 1; - else - mask[a][b + a][c + a] = 0; - } - } - } - - /* Store values back to vf->priv so they aren't lost after the function returns. */ - vf->priv->mask = mask; - - return; -} - -/** - * \brief Pre-processes an image to give distance information. - * - * \param vf Data structure that holds persistant information. All it is used for - in this function is to store the calculated max_mask_size variable. - * \param mask This image will be converted from a greyscale image into a - * distance image. - * - * This function takes a greyscale image (pgm_structure * mask) and converts it - * in place into a distance image. A distance image is zero for pixels ourside of - * the logo and is the manhattan distance (|dx| + |dy|) for pixels inside of the - * logo. This will overestimate the distance, but that is safe, and is far easier - * to implement than a proper pythagorean distance since I'm using a modified - * erosion algorithm to compute the distances. - */ -static void convert_mask_to_strength_mask(vf_instance_t * vf, pgm_structure * mask) -{ - int x, y; /* Used by our for loops to go through every single pixel in the picture one at a time. */ - int has_anything_changed = 1; /* Used by the main while() loop to know if anything changed on the last erosion. */ - int current_pass = 0; /* How many times we've gone through the loop. Used in the in-place erosion algorithm - and to get us max_mask_size later on. */ - int max_mask_size; /* This will record how large a mask the pixel that is the furthest from the edge of the logo - (and thus the neediest) is. */ - char * current_pixel = mask->pixel; /* This stores the actual pixel data. */ - - /* First pass, set all non-zero values to 1. After this loop finishes, the data should be considered numeric - data for the filter, not color data. */ - for (x = 0; x < mask->height * mask->width; x++, current_pixel++) - if(*current_pixel) *current_pixel = 1; - - /* Second pass and future passes. For each pass, if a pixel is itself the same value as the current pass, - and its four neighbors are too, then it is incremented. If no pixels are incremented by the end of the pass, - then we go again. Edge pixels are counted as always excluded (this should be true anyway for any sane mask, - but if it isn't this will ensure that we eventually exit). */ - while (has_anything_changed) - { - current_pass++; - current_pixel = mask->pixel; - - has_anything_changed = 0; /* If this doesn't get set by the end of this pass, then we're done. */ - - for (y = 1; y < mask->height - 1; y++) - { - for (x = 1; x < mask->width - 1; x++) - { - /* Apply the in-place erosion transform. It is based on the following two premises: 1 - Any pixel that fails 1 erosion - will fail all future erosions. 2 - Only pixels having survived all erosions up to the present will be >= to - current_pass. It doesn't matter if it survived the current pass, failed it, or hasn't been tested yet. */ - if (*current_pixel >= current_pass && /* By using >= instead of ==, we allow the algorithm to work in place. */ - *(current_pixel + 1) >= current_pass && - *(current_pixel - 1) >= current_pass && - *(current_pixel + mask->width) >= current_pass && - *(current_pixel - mask->width) >= current_pass) - { - (*current_pixel)++; /* Increment the value since it still has not been eroded, as evidenced by the if statement - that just evaluated to true. */ - has_anything_changed = 1; - } - current_pixel++; - } - } - } - - /* Apply the fudge factor, which will increase the size of the mask a little to reduce jitter at the cost of more blur. */ - for (y = 1; y < mask->height - 1; y++) - { - for (x = 1; x < mask->width - 1; x++) - { - mask->pixel[(y * mask->width) + x] = apply_mask_fudge_factor(mask->pixel[(y * mask->width) + x]); - } - } - - max_mask_size = current_pass + 1; /* As a side-effect, we now know the maximum mask size, which we'll use to generate our masks. */ - max_mask_size = apply_mask_fudge_factor(max_mask_size); /* Apply the fudge factor to this number too, since we must - ensure that enough masks are generated. */ - vf->priv->max_mask_size = max_mask_size; /* Commit the newly calculated max_mask_size to the vf->priv struct. */ - - return; -} - -/** - * \brief Our blurring function. - * - * \param vf Stores persistant data. In this function we are interested in the - * array of masks. - * \param value_out The properly blurred and delogoed pixel is outputted here. - * \param logo_mask Tells us which pixels are in the logo and which aren't. - * \param image The image that is having its logo removed. - * \param x x-coordinate of the pixel to blur. - * \param y y-coordinate of the pixel to blur. - * \param plane 0 = luma, 1 = blue chroma, 2 = red chroma (YUV). - * - * This function is the core of the filter. It takes a pixel that is inside the - * logo and blurs it. It does so by finding the average of all the pixels within - * the mask and outside of the logo. - */ -static void get_blur(const vf_instance_t * const vf, unsigned int * const value_out, const pgm_structure * const logo_mask, - const mp_image_t * const image, const int x, const int y, const int plane) -{ - int mask_size; /* Mask size tells how large a circle to use. The radius is about (slightly larger than) mask size. */ - /* Get values from vf->priv for faster dereferencing. */ - int * * * mask = vf->priv->mask; - - int start_posx, start_posy, end_posx, end_posy; - int i, j; - unsigned int accumulator = 0, divisor = 0; - const unsigned char * mask_read_position; /* What pixel we are reading out of the circular blur mask. */ - const unsigned char * logo_mask_read_position; /* What pixel we are reading out of the filter image. */ - - /* Prepare our bounding rectangle and clip it if need be. */ - mask_size = test_filter(logo_mask, x, y); - start_posx = max(0, x - mask_size); - start_posy = max(0, y - mask_size); - end_posx = min(image->width - 1, x + mask_size); - end_posy = min(image->height - 1, y + mask_size); - - mask_read_position = image->planes[plane] + (image->stride[plane] * start_posy) + start_posx; - logo_mask_read_position = logo_mask->pixel + (start_posy * logo_mask->width) + start_posx; - - for (j = start_posy; j <= end_posy; j++) - { - for (i = start_posx; i <= end_posx; i++) - { - if (!(*logo_mask_read_position) && mask[mask_size][i - start_posx][j - start_posy]) - { /* Check to see if this pixel is in the logo or not. Only use the pixel if it is not. */ - accumulator += *mask_read_position; - divisor++; - } - - mask_read_position++; - logo_mask_read_position++; - } - - mask_read_position += (image->stride[plane] - ((end_posx + 1) - start_posx)); - logo_mask_read_position += (logo_mask->width - ((end_posx + 1) - start_posx)); - } - - if (divisor == 0) /* This means that not a single pixel is outside of the logo, so we have no data. */ - { /* We should put some eye catching value here, to indicate the flaw to the user. */ - *value_out = 255; - } - else /* Else we need to normalise the data using the divisor. */ - { - *value_out = (accumulator + (divisor / 2)) / divisor; /* Divide, taking into account average rounding error. */ - } - - return; -} - -/** - * \brief Free a pgm_structure. Undoes load_pgm(...). - */ -static void destroy_pgm(pgm_structure * to_be_destroyed) -{ - if (to_be_destroyed == NULL) - return; /* Don't do anything if a NULL pointer was passed it. */ - - /* Internally allocated memory. */ - if (to_be_destroyed->pixel != NULL) - { - free(to_be_destroyed->pixel); - to_be_destroyed->pixel = NULL; - } - - /* Free the actual struct instance. This is done here and not by the calling function. */ - free(to_be_destroyed); -} - -/** \brief Helper function for load_pgm(...) to skip whitespace. */ -static void load_pgm_skip(FILE *f) { - int c, comment = 0; - do { - c = fgetc(f); - if (c == '#') - comment = 1; - if (c == '\n') - comment = 0; - } while (c != EOF && (isspace(c) || comment)); - ungetc(c, f); -} - -#define REMOVE_LOGO_LOAD_PGM_ERROR_MESSAGE(message) {mp_msg(MSGT_VFILTER, MSGL_ERR, message); return NULL;} - -/** - * \brief Loads a raw pgm or ppm file into a newly created pgm_structure object. - * - * \param file_name The name of the file to be loaded. So long as the file is a - * valid pgm or ppm file, it will load correctly, even if the - * extension is missing or invalid. - * - * \return A pointer to the newly created pgm_structure object. Don't forget to - * call destroy_pgm(...) when you're done with this. If an error occurs, - * NULL is returned. - * - * Can load either raw pgm (P5) or raw ppm (P6) image files as a binary image. - * While a pgm file will be loaded normally (greyscale), the only thing that is - * guaranteed with ppm is that all zero (R = 0, G = 0, B = 0) pixels will remain - * zero, and non-zero pixels will remain non-zero. - */ -static pgm_structure * load_pgm(const char * file_name) -{ - int maximum_greyscale_value; - FILE * input; - int pnm_number; - pgm_structure * new_pgm = (pgm_structure *) safe_malloc (sizeof(pgm_structure)); - char * write_position; - char * end_position; - int image_size; /* width * height */ - - if((input = fopen(file_name, "rb")) == NULL) REMOVE_LOGO_LOAD_PGM_ERROR_MESSAGE("[vf]remove-logo: Unable to open file. File not found or insufficient permissions.\n"); - - /* Parse the PGM header. */ - if (fgetc(input) != 'P') REMOVE_LOGO_LOAD_PGM_ERROR_MESSAGE("[vf]remove-logo: File is not a valid PGM or PPM file.\n"); - pnm_number = fgetc(input) - '0'; - if (pnm_number != 5 && pnm_number != 6) REMOVE_LOGO_LOAD_PGM_ERROR_MESSAGE("[vf]remove-logo: Invalid PNM file. Only raw PGM (Portable Gray Map) and raw PPM (Portable Pixel Map) subtypes are allowed.\n"); - load_pgm_skip(input); - if (fscanf(input, "%i", &(new_pgm->width)) != 1) REMOVE_LOGO_LOAD_PGM_ERROR_MESSAGE("[vf]remove-logo: Invalid PGM/PPM header.\n"); - load_pgm_skip(input); - if (fscanf(input, "%i", &(new_pgm->height)) != 1) REMOVE_LOGO_LOAD_PGM_ERROR_MESSAGE("[vf]remove-logo: Invalid PGM/PPM header.\n"); - load_pgm_skip(input); - if (fscanf(input, "%i", &maximum_greyscale_value) != 1) REMOVE_LOGO_LOAD_PGM_ERROR_MESSAGE("[vf]remove-logo: Invalid PGM/PPM header.\n"); - if (maximum_greyscale_value >= 256) REMOVE_LOGO_LOAD_PGM_ERROR_MESSAGE("[vf]remove_logo: Only 1 byte per pixel (pgm) or 1 byte per color value (ppm) are supported.\n"); - load_pgm_skip(input); - - new_pgm->pixel = (unsigned char *) safe_malloc (sizeof(unsigned char) * new_pgm->width * new_pgm->height); - - /* Load the pixels. */ - /* Note: I am aware that fgetc(input) isn't the fastest way of doing things, but it is quite compact and the code only runs once when the filter is initialized.*/ - image_size = new_pgm->width * new_pgm->height; - end_position = new_pgm->pixel + image_size; - for (write_position = new_pgm->pixel; write_position < end_position; write_position++) - { - *write_position = fgetc(input); - if (pnm_number == 6) /* This tests to see if the file is a PPM file. */ - { /* If it is, then consider the pixel set if any of the three color channels are set. Since we just care about == 0 or != 0, a bitwise or will do the trick. */ - *write_position |= fgetc(input); - *write_position |= fgetc(input); - } - } - - return new_pgm; -} - -/** - * \brief Generates a scaled down image with half width, height, and intensity. - * - * \param vf Our struct for persistant data. In this case, it is used to update - * mask_max_size with the larger of the old or new value. - * \param input_image The image from which the new half-sized one will be based. - * - * \return The newly allocated and shrunken image. - * - * This function not only scales down an image, but halves the value in each pixel - * too. The purpose of this is to produce a chroma filter image out of a luma - * filter image. The pixel values store the distance to the edge of the logo and - * halving the dimensions halves the distance. This function rounds up, because - * a downwards rounding error could cause the filter to fail, but an upwards - * rounding error will only cause a minor amount of excess blur in the chroma - * planes. - */ -static pgm_structure * generate_half_size_image(vf_instance_t * vf, pgm_structure * input_image) -{ - int x, y; - pgm_structure * new_pgm = (pgm_structure *) safe_malloc (sizeof(pgm_structure)); - int has_anything_changed = 1; - int current_pass; - int max_mask_size; - char * current_pixel; - - new_pgm->width = input_image->width / 2; - new_pgm->height = input_image->height / 2; - new_pgm->pixel = (unsigned char *) safe_malloc (sizeof(unsigned char) * new_pgm->width * new_pgm->height); - - /* Copy over the image data, using the average of 4 pixels for to calculate each downsampled pixel. */ - for (y = 0; y < new_pgm->height; y++) - for (x = 0; x < new_pgm->width; x++) - { - /* Set the pixel if there exists a non-zero value in the source pixels, else clear it. */ - new_pgm->pixel[(y * new_pgm->width) + x] = input_image->pixel[((y << 1) * input_image->width) + (x << 1)] || - input_image->pixel[((y << 1) * input_image->width) + (x << 1) + 1] || - input_image->pixel[(((y << 1) + 1) * input_image->width) + (x << 1)] || - input_image->pixel[(((y << 1) + 1) * input_image->width) + (x << 1) + 1]; - new_pgm->pixel[(y * new_pgm->width) + x] = min(1, new_pgm->pixel[(y * new_pgm->width) + x]); - } - - /* Now we need to recalculate the numbers for the smaller size. Just using the old_value / 2 can cause subtle - and fairly rare, but very nasty, bugs. */ - - current_pixel = new_pgm->pixel; - /* First pass, set all non-zero values to 1. */ - for (x = 0; x < new_pgm->height * new_pgm->width; x++, current_pixel++) - if(*current_pixel) *current_pixel = 1; - - /* Second pass and future passes. For each pass, if a pixel is itself the same value as the current pass, - and its four neighbors are too, then it is incremented. If no pixels are incremented by the end of the pass, - then we go again. Edge pixels are counted as always excluded (this should be true anyway for any sane mask, - but if it isn't this will ensure that we eventually exit). */ - current_pass = 0; - while (has_anything_changed) - { - current_pass++; - - has_anything_changed = 0; /* If this doesn't get set by the end of this pass, then we're done. */ - - for (y = 1; y < new_pgm->height - 1; y++) - { - for (x = 1; x < new_pgm->width - 1; x++) - { - if (new_pgm->pixel[(y * new_pgm->width) + x] >= current_pass && /* By using >= instead of ==, we allow the algorithm to work in place. */ - new_pgm->pixel[(y * new_pgm->width) + (x + 1)] >= current_pass && - new_pgm->pixel[(y * new_pgm->width) + (x - 1)] >= current_pass && - new_pgm->pixel[((y + 1) * new_pgm->width) + x] >= current_pass && - new_pgm->pixel[((y - 1) * new_pgm->width) + x] >= current_pass) - { - new_pgm->pixel[(y * new_pgm->width) + x]++; /* Increment the value since it still has not been eroded, - as evidenced by the if statement that just evaluated to true. */ - has_anything_changed = 1; - } - } - } - } - - for (y = 1; y < new_pgm->height - 1; y++) - { - for (x = 1; x < new_pgm->width - 1; x++) - { - new_pgm->pixel[(y * new_pgm->width) + x] = apply_mask_fudge_factor(new_pgm->pixel[(y * new_pgm->width) + x]); - } - } - - max_mask_size = current_pass + 1; /* As a side-effect, we now know the maximum mask size, which we'll use to generate our masks. */ - max_mask_size = apply_mask_fudge_factor(max_mask_size); - /* Commit the newly calculated max_mask_size to the vf->priv struct. */ - vf->priv->max_mask_size = max(max_mask_size, vf->priv->max_mask_size); - - return new_pgm; -} - -/** - * \brief Checks if YV12 is supported by the next filter. - */ -static unsigned int find_best(struct vf_instance *vf){ - int is_format_okay = vf_next_query_format(vf, IMGFMT_YV12); - if ((is_format_okay & VFCAP_CSP_SUPPORTED_BY_HW) || (is_format_okay & VFCAP_CSP_SUPPORTED)) - return IMGFMT_YV12; - else - return 0; -} - -//===========================================================================// - -/** - * \brief Configure the filter and call the next filter's config function. - */ -static int config(struct vf_instance *vf, int width, int height, int d_width, int d_height, unsigned int flags, unsigned int outfmt) -{ - if(!(vf->priv->fmt=find_best(vf))) - return 0; - else - return vf_next_config(vf,width,height,d_width,d_height,flags,vf->priv->fmt); -} - -/** - * \brief Removes the logo from a plane (either luma or chroma). - * - * \param vf Not needed by this function, but needed by the blur function. - * \param source The image to have it's logo removed. - * \param destination Where the output image will be stored. - * \param source_stride How far apart (in memory) two consecutive lines are. - * \param destination Same as source_stride, but for the destination image. - * \param width Width of the image. This is the same for source and destination. - * \param height Height of the image. This is the same for source and destination. - * \param is_image_direct If the image is direct, then source and destination are - * the same and we can save a lot of time by not copying pixels that - * haven't changed. - * \param filter The image that stores the distance to the edge of the logo for - * each pixel. - * \param logo_start_x Smallest x-coordinate that contains at least 1 logo pixel. - * \param logo_start_y Smallest y-coordinate that contains at least 1 logo pixel. - * \param logo_end_x Largest x-coordinate that contains at least 1 logo pixel. - * \param logo_end_y Largest y-coordinate that contains at least 1 logo pixel. - * - * This function processes an entire plane. Pixels outside of the logo are copied - * to the output without change, and pixels inside the logo have the de-blurring - * function applied. - */ -static void convert_yv12(const vf_instance_t * const vf, const char * const source, const int source_stride, - const mp_image_t * const source_image, const int width, const int height, - char * const destination, const int destination_stride, int is_image_direct, pgm_structure * filter, - const int plane, const int logo_start_x, const int logo_start_y, const int logo_end_x, const int logo_end_y) -{ - int y; - int x; - - /* These pointers point to where we are getting our pixel data (inside mpi) and where we are storing it (inside dmpi). */ - const unsigned char * source_line; - unsigned char * destination_line; - - if (!is_image_direct) - memcpy_pic(destination, source, width, height, destination_stride, source_stride); - - for (y = logo_start_y; y <= logo_end_y; y++) - { - source_line = (const unsigned char *) source + (source_stride * y); - destination_line = (unsigned char *) destination + (destination_stride * y); - - for (x = logo_start_x; x <= logo_end_x; x++) - { - unsigned int output; - - if (filter->pixel[(y * filter->width) + x]) /* Only process if we are in the logo. */ - { - get_blur(vf, &output, filter, source_image, x, y, plane); - destination_line[x] = output; - } - else /* Else just copy the data. */ - if (!is_image_direct) - destination_line[x] = source_line[x]; - } - } -} - -/** - * \brief Process a frame. - * - * \param mpi The image sent to use by the previous filter. - * \param dmpi Where we will store the processed output image. - * \param vf This is how the filter gets access to it's persistant data. - * - * \return The return code of the next filter, or 0 on failure/error. - * - * This function processes an entire frame. The frame is sent by the previous - * filter, has the logo removed by the filter, and is then sent to the next - * filter. - */ -static int put_image(struct vf_instance *vf, mp_image_t *mpi, double pts){ - mp_image_t *dmpi; - - dmpi=vf_get_image(vf->next,vf->priv->fmt, - MP_IMGTYPE_TEMP, MP_IMGFLAG_ACCEPT_STRIDE, - mpi->w, mpi->h); - - /* Check to make sure that the filter image and the video stream are the same size. */ - if (vf->priv->filter->width != mpi->w || vf->priv->filter->height != mpi->h) - { - mp_msg(MSGT_VFILTER,MSGL_ERR, "Filter image and video stream are not of the same size. (Filter: %d x %d, Stream: %d x %d)\n", - vf->priv->filter->width, vf->priv->filter->height, mpi->w, mpi->h); - return 0; - } - - switch(dmpi->imgfmt){ - case IMGFMT_YV12: - convert_yv12(vf, mpi->planes[0], mpi->stride[0], mpi, mpi->w, mpi->h, - dmpi->planes[0], dmpi->stride[0], - mpi->flags & MP_IMGFLAG_DIRECT, vf->priv->filter, 0, - vf->priv->bounding_rectangle_posx1, vf->priv->bounding_rectangle_posy1, - vf->priv->bounding_rectangle_posx2, vf->priv->bounding_rectangle_posy2); - convert_yv12(vf, mpi->planes[1], mpi->stride[1], mpi, mpi->w / 2, mpi->h / 2, - dmpi->planes[1], dmpi->stride[1], - mpi->flags & MP_IMGFLAG_DIRECT, vf->priv->half_size_filter, 1, - vf->priv->bounding_rectangle_half_size_posx1, vf->priv->bounding_rectangle_half_size_posy1, - vf->priv->bounding_rectangle_half_size_posx2, vf->priv->bounding_rectangle_half_size_posy2); - convert_yv12(vf, mpi->planes[2], mpi->stride[2], mpi, mpi->w / 2, mpi->h / 2, - dmpi->planes[2], dmpi->stride[2], - mpi->flags & MP_IMGFLAG_DIRECT, vf->priv->half_size_filter, 2, - vf->priv->bounding_rectangle_half_size_posx1, vf->priv->bounding_rectangle_half_size_posy1, - vf->priv->bounding_rectangle_half_size_posx2, vf->priv->bounding_rectangle_half_size_posy2); - break; - - default: - mp_msg(MSGT_VFILTER,MSGL_ERR,"Unhandled format: 0x%X\n",dmpi->imgfmt); - return 0; - } - - return vf_next_put_image(vf,dmpi, pts); -} - -//===========================================================================// - -/** - * \brief Checks to see if the next filter accepts YV12 images. - */ -static int query_format(struct vf_instance *vf, unsigned int fmt) -{ - if (fmt == IMGFMT_YV12) - return vf_next_query_format(vf, IMGFMT_YV12); - else - return 0; -} - -/** - * \brief Frees memory that our filter allocated. - * - * This is called at exit-time. - */ -static void uninit(vf_instance_t *vf) -{ - /* Destroy our masks and images. */ - destroy_pgm(vf->priv->filter); - destroy_pgm(vf->priv->half_size_filter); - destroy_masks(vf); - - /* Destroy our private structure that had been used to store those masks and images. */ - free(vf->priv); - - return; -} - -/** - * \brief Initializes our filter. - * - * \param args The arguments passed in from the command line go here. This - * filter expects only a single argument telling it where the PGM - * or PPM file that describes the logo region is. - * - * This sets up our instance variables and parses the arguments to the filter. - */ -static int vf_open(vf_instance_t *vf, char *args) -{ - vf->priv = safe_malloc(sizeof(vf_priv_s)); - vf->uninit = uninit; - - /* Load our filter image. */ - if (args) - vf->priv->filter = load_pgm(args); - else - { - mp_msg(MSGT_VFILTER, MSGL_ERR, "[vf]remove_logo usage: remove_logo=/path/to/filter_image_file.pgm\n"); - free(vf->priv); - return 0; - } - - if (vf->priv->filter == NULL) - { - /* Error message was displayed by load_pgm(). */ - free(vf->priv); - return 0; - } - - /* Create the scaled down filter image for the chroma planes. */ - convert_mask_to_strength_mask(vf, vf->priv->filter); - vf->priv->half_size_filter = generate_half_size_image(vf, vf->priv->filter); - - /* Now that we know how many masks we need (the info is in vf), we can generate the masks. */ - initialize_masks(vf); - - /* Calculate our bounding rectangles, which determine in what region the logo resides for faster processing. */ - calculate_bounding_rectangle(&vf->priv->bounding_rectangle_posx1, &vf->priv->bounding_rectangle_posy1, - &vf->priv->bounding_rectangle_posx2, &vf->priv->bounding_rectangle_posy2, - vf->priv->filter); - calculate_bounding_rectangle(&vf->priv->bounding_rectangle_half_size_posx1, - &vf->priv->bounding_rectangle_half_size_posy1, - &vf->priv->bounding_rectangle_half_size_posx2, - &vf->priv->bounding_rectangle_half_size_posy2, - vf->priv->half_size_filter); - - vf->config=config; - vf->put_image=put_image; - vf->query_format=query_format; - return 1; -} - -/** - * \brief Meta data about our filter. - */ -const vf_info_t vf_info_remove_logo = { - "Removes a tv logo based on a mask image.", - "remove-logo", - "Robert Edele", - "", - vf_open, - NULL -}; - -//===========================================================================// |