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ffmpeg/vhook/watermark.c

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/*
* Watermark Hook
* Copyright (c) 2005 Marcus Engene myfirstname(at)mylastname.se
*
* parameters for watermark:
* -m nbr = nbr is 0..1. 0 is the default mode, see below.
* -t nbr = nbr is six digit hex. Threshold.
* -f file = file is the watermark image filename. You must specify this!
*
* MODE 0:
* The watermark picture works like this (assuming color intensities 0..0xff):
* Per color do this:
* If mask color is 0x80, no change to the original frame.
* If mask color is < 0x80 the abs difference is subtracted from the frame. If
* result < 0, result = 0
* If mask color is > 0x80 the abs difference is added to the frame. If result
* > 0xff, result = 0xff
*
* You can override the 0x80 level with the -t flag. E.g. if threshold is
* 000000 the color value of watermark is added to the destination.
*
* This way a mask that is visible both in light pictures and in dark can be
* made (fex by using a picture generated by Gimp and the bump map tool).
*
* An example watermark file is at
* http://engene.se/ffmpeg_watermark.gif
*
* MODE 1:
* Per color do this:
* If mask color > threshold color then the watermark pixel is used.
*
* Example usage:
* ffmpeg -i infile -vhook '/path/watermark.so -f wm.gif' -an out.mov
* ffmpeg -i infile -vhook '/path/watermark.so -f wm.gif -m 1 -t 222222' -an out.mov
*
* Note that the entire vhook argument is encapsulated in ''. This
* way, arguments to the vhook won't be mixed up with those for ffmpeg.
*
* 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
*/
#include <stdlib.h>
//#include <fcntl.h>
#include <unistd.h>
#include <stdarg.h>
#include "libavutil/common.h"
#include "libavformat/avformat.h"
#include "libavformat/framehook.h"
#include "libswscale/swscale.h"
static int sws_flags = SWS_BICUBIC;
typedef struct {
char filename[2000];
int x_size;
int y_size;
/* get_watermark_picture() variables */
AVFormatContext *pFormatCtx;
const char *p_ext;
int videoStream;
int frameFinished;
AVCodecContext *pCodecCtx;
AVCodec *pCodec;
AVFrame *pFrame;
AVPacket packet;
int numBytes;
uint8_t *buffer;
int i;
AVInputFormat *file_iformat;
AVStream *st;
int is_done;
AVFrame *pFrameRGB;
int thrR;
int thrG;
int thrB;
int mode;
// This vhook first converts frame to RGB ...
struct SwsContext *toRGB_convert_ctx;
// ... then converts a watermark and applies it to the RGB frame ...
struct SwsContext *watermark_convert_ctx;
// ... and finally converts back frame from RGB to initial format
struct SwsContext *fromRGB_convert_ctx;
} ContextInfo;
int get_watermark_picture(ContextInfo *ci, int cleanup);
/****************************************************************************
*
****************************************************************************/
void Release(void *ctx)
{
ContextInfo *ci;
ci = (ContextInfo *) ctx;
if (ci) {
get_watermark_picture(ci, 1);
sws_freeContext(ci->toRGB_convert_ctx);
sws_freeContext(ci->watermark_convert_ctx);
sws_freeContext(ci->fromRGB_convert_ctx);
}
av_free(ctx);
}
/****************************************************************************
*
****************************************************************************/
int Configure(void **ctxp, int argc, char *argv[])
{
ContextInfo *ci;
int c;
int tmp = 0;
if (0 == (*ctxp = av_mallocz(sizeof(ContextInfo)))) return -1;
ci = (ContextInfo *) *ctxp;
optind = 1;
// Struct is mallocz:ed so no need to reset.
ci->thrR = 0x80;
ci->thrG = 0x80;
ci->thrB = 0x80;
while ((c = getopt(argc, argv, "f:m:t:")) > 0) {
switch (c) {
case 'f':
strncpy(ci->filename, optarg, 1999);
ci->filename[1999] = 0;
break;
case 'm':
ci->mode = atoi(optarg);
break;
case 't':
if (1 != sscanf(optarg, "%x", &tmp)) {
av_log(NULL, AV_LOG_ERROR, "Watermark: argument to -t must be a 6 digit hex number\n");
return -1;
}
ci->thrR = (tmp >> 16) & 0xff;
ci->thrG = (tmp >> 8) & 0xff;
ci->thrB = (tmp >> 0) & 0xff;
break;
default:
av_log(NULL, AV_LOG_ERROR, "Watermark: Unrecognized argument '%s'\n", argv[optind]);
return -1;
}
}
//
if (0 == ci->filename[0]) {
av_log(NULL, AV_LOG_ERROR, "Watermark: There is no filename specified.\n");
return -1;
}
av_register_all();
return get_watermark_picture(ci, 0);
}
/****************************************************************************
* For mode 0 (the original one)
****************************************************************************/
static void Process0(void *ctx,
AVPicture *picture,
enum PixelFormat pix_fmt,
int src_width,
int src_height,
int64_t pts)
{
ContextInfo *ci = (ContextInfo *) ctx;
char *buf = 0;
AVPicture picture1;
AVPicture *pict = picture;
AVFrame *pFrameRGB;
int xm_size;
int ym_size;
int x;
int y;
int offs, offsm;
int mpoffs;
uint32_t *p_pixel = 0;
uint32_t pixel_meck;
uint32_t pixel;
uint32_t pixelm;
int tmp;
int thrR = ci->thrR;
int thrG = ci->thrG;
int thrB = ci->thrB;
if (pix_fmt != PIX_FMT_RGB32) {
int size;
size = avpicture_get_size(PIX_FMT_RGB32, src_width, src_height);
buf = av_malloc(size);
avpicture_fill(&picture1, buf, PIX_FMT_RGB32, src_width, src_height);
// if we already got a SWS context, let's realloc if is not re-useable
ci->toRGB_convert_ctx = sws_getCachedContext(ci->toRGB_convert_ctx,
src_width, src_height, pix_fmt,
src_width, src_height, PIX_FMT_RGB32,
sws_flags, NULL, NULL, NULL);
if (ci->toRGB_convert_ctx == NULL) {
av_log(NULL, AV_LOG_ERROR,
"Cannot initialize the toRGB conversion context\n");
return;
}
// img_convert parameters are 2 first destination, then 4 source
// sws_scale parameters are context, 4 first source, then 2 destination
sws_scale(ci->toRGB_convert_ctx,
picture->data, picture->linesize, 0, src_height,
picture1.data, picture1.linesize);
pict = &picture1;
}
/* Insert filter code here */ /* ok */
// Get me next frame
if (0 > get_watermark_picture(ci, 0)) {
return;
}
// These are the three original static variables in the ffmpeg hack.
pFrameRGB = ci->pFrameRGB;
xm_size = ci->x_size;
ym_size = ci->y_size;
// I'll do the *4 => <<2 crap later. Most compilers understand that anyway.
// According to avcodec.h PIX_FMT_RGB32 is handled in endian specific manner.
for (y=0; y<src_height; y++) {
offs = y * (src_width * 4);
offsm = (((y * ym_size) / src_height) * 4) * xm_size; // offsm first in maskline. byteoffs!
for (x=0; x<src_width; x++) {
mpoffs = offsm + (((x * xm_size) / src_width) * 4);
p_pixel = (uint32_t *)&((pFrameRGB->data[0])[mpoffs]);
pixelm = *p_pixel;
p_pixel = (uint32_t *)&((pict->data[0])[offs]);
pixel = *p_pixel;
// pixelm = *((uint32_t *)&(pFrameRGB->data[mpoffs]));
pixel_meck = pixel & 0xff000000;
// R
tmp = (int)((pixel >> 16) & 0xff) + (int)((pixelm >> 16) & 0xff) - thrR;
if (tmp > 255) tmp = 255;
if (tmp < 0) tmp = 0;
pixel_meck |= (tmp << 16) & 0xff0000;
// G
tmp = (int)((pixel >> 8) & 0xff) + (int)((pixelm >> 8) & 0xff) - thrG;
if (tmp > 255) tmp = 255;
if (tmp < 0) tmp = 0;
pixel_meck |= (tmp << 8) & 0xff00;
// B
tmp = (int)((pixel >> 0) & 0xff) + (int)((pixelm >> 0) & 0xff) - thrB;
if (tmp > 255) tmp = 255;
if (tmp < 0) tmp = 0;
pixel_meck |= (tmp << 0) & 0xff;
// test:
//pixel_meck = pixel & 0xff000000;
//pixel_meck |= (pixelm & 0x00ffffff);
*p_pixel = pixel_meck;
offs += 4;
} // foreach X
} // foreach Y
if (pix_fmt != PIX_FMT_RGB32) {
ci->fromRGB_convert_ctx = sws_getCachedContext(ci->fromRGB_convert_ctx,
src_width, src_height, PIX_FMT_RGB32,
src_width, src_height, pix_fmt,
sws_flags, NULL, NULL, NULL);
if (ci->fromRGB_convert_ctx == NULL) {
av_log(NULL, AV_LOG_ERROR,
"Cannot initialize the fromRGB conversion context\n");
return;
}
// img_convert parameters are 2 first destination, then 4 source
// sws_scale parameters are context, 4 first source, then 2 destination
sws_scale(ci->fromRGB_convert_ctx,
picture1.data, picture1.linesize, 0, src_height,
picture->data, picture->linesize);
}
av_free(buf);
}
/****************************************************************************
* For mode 1 (the original one)
****************************************************************************/
static void Process1(void *ctx,
AVPicture *picture,
enum PixelFormat pix_fmt,
int src_width,
int src_height,
int64_t pts)
{
ContextInfo *ci = (ContextInfo *) ctx;
char *buf = 0;
AVPicture picture1;
AVPicture *pict = picture;
AVFrame *pFrameRGB;
int xm_size;
int ym_size;
int x;
int y;
int offs, offsm;
int mpoffs;
uint32_t *p_pixel = 0;
uint32_t pixel;
uint32_t pixelm;
if (pix_fmt != PIX_FMT_RGB32) {
int size;
size = avpicture_get_size(PIX_FMT_RGB32, src_width, src_height);
buf = av_malloc(size);
avpicture_fill(&picture1, buf, PIX_FMT_RGB32, src_width, src_height);
// if we already got a SWS context, let's realloc if is not re-useable
ci->toRGB_convert_ctx = sws_getCachedContext(ci->toRGB_convert_ctx,
src_width, src_height, pix_fmt,
src_width, src_height, PIX_FMT_RGB32,
sws_flags, NULL, NULL, NULL);
if (ci->toRGB_convert_ctx == NULL) {
av_log(NULL, AV_LOG_ERROR,
"Cannot initialize the toRGB conversion context\n");
return;
}
// img_convert parameters are 2 first destination, then 4 source
// sws_scale parameters are context, 4 first source, then 2 destination
sws_scale(ci->toRGB_convert_ctx,
picture->data, picture->linesize, 0, src_height,
picture1.data, picture1.linesize);
pict = &picture1;
}
/* Insert filter code here */ /* ok */
// Get me next frame
if (0 > get_watermark_picture(ci, 0)) {
return;
}
// These are the three original static variables in the ffmpeg hack.
pFrameRGB = ci->pFrameRGB;
xm_size = ci->x_size;
ym_size = ci->y_size;
// I'll do the *4 => <<2 crap later. Most compilers understand that anyway.
// According to avcodec.h PIX_FMT_RGB32 is handled in endian specific manner.
for (y=0; y<src_height; y++) {
offs = y * (src_width * 4);
offsm = (((y * ym_size) / src_height) * 4) * xm_size; // offsm first in maskline. byteoffs!
for (x=0; x<src_width; x++) {
mpoffs = offsm + (((x * xm_size) / src_width) * 4);
p_pixel = (uint32_t *)&((pFrameRGB->data[0])[mpoffs]);
pixelm = *p_pixel; /* watermark pixel */
p_pixel = (uint32_t *)&((pict->data[0])[offs]);
pixel = *p_pixel;
if (((pixelm >> 16) & 0xff) > ci->thrR ||
((pixelm >> 8) & 0xff) > ci->thrG ||
((pixelm >> 0) & 0xff) > ci->thrB)
{
*p_pixel = pixelm;
} else {
*p_pixel = pixel;
}
offs += 4;
} // foreach X
} // foreach Y
if (pix_fmt != PIX_FMT_RGB32) {
ci->fromRGB_convert_ctx = sws_getCachedContext(ci->fromRGB_convert_ctx,
src_width, src_height, PIX_FMT_RGB32,
src_width, src_height, pix_fmt,
sws_flags, NULL, NULL, NULL);
if (ci->fromRGB_convert_ctx == NULL) {
av_log(NULL, AV_LOG_ERROR,
"Cannot initialize the fromRGB conversion context\n");
return;
}
// img_convert parameters are 2 first destination, then 4 source
// sws_scale parameters are context, 4 first source, then 2 destination
sws_scale(ci->fromRGB_convert_ctx,
picture1.data, picture1.linesize, 0, src_height,
picture->data, picture->linesize);
}
av_free(buf);
}
/****************************************************************************
* This is the function ffmpeg.c callbacks.
****************************************************************************/
void Process(void *ctx,
AVPicture *picture,
enum PixelFormat pix_fmt,
int src_width,
int src_height,
int64_t pts)
{
ContextInfo *ci = (ContextInfo *) ctx;
if (1 == ci->mode) {
Process1(ctx, picture, pix_fmt, src_width, src_height, pts);
} else {
Process0(ctx, picture, pix_fmt, src_width, src_height, pts);
}
}
/****************************************************************************
* When cleanup == 0, we try to get the next frame. If no next frame, nothing
* is done.
*
* This code follows the example on
* http://www.inb.uni-luebeck.de/~boehme/using_libavcodec.html
*
* 0 = ok, -1 = error
****************************************************************************/
int get_watermark_picture(ContextInfo *ci, int cleanup)
{
if (1 == ci->is_done && 0 == cleanup) return 0;
// Yes, *pFrameRGB arguments must be null the first time otherwise it's not good..
// This block is only executed the first time we enter this function.
if (0 == ci->pFrameRGB &&
0 == cleanup)
{
/*
* The last three parameters specify the file format, buffer size and format
* parameters; by simply specifying NULL or 0 we ask libavformat to auto-detect
* the format and use a default buffer size. (Didn't work!)
*/
if (av_open_input_file(&ci->pFormatCtx, ci->filename, NULL, 0, NULL) != 0) {
// Martin says this should not be necessary but it failed for me sending in
// NULL instead of file_iformat to av_open_input_file()
ci->i = strlen(ci->filename);
if (0 == ci->i) {
av_log(NULL, AV_LOG_ERROR, "get_watermark_picture() No filename to watermark vhook\n");
return -1;
}
while (ci->i > 0) {
if (ci->filename[ci->i] == '.') {
ci->i++;
break;
}
ci->i--;
}
ci->p_ext = &(ci->filename[ci->i]);
ci->file_iformat = av_find_input_format (ci->p_ext);
if (0 == ci->file_iformat) {
av_log(NULL, AV_LOG_INFO, "get_watermark_picture() attempt to use image2 for [%s]\n", ci->p_ext);
ci->file_iformat = av_find_input_format ("image2");
}
if (0 == ci->file_iformat) {
av_log(NULL, AV_LOG_ERROR, "get_watermark_picture() Really failed to find iformat [%s]\n", ci->p_ext);
return -1;
}
// now continues the Martin template.
if (av_open_input_file(&ci->pFormatCtx, ci->filename, ci->file_iformat, 0, NULL)!=0) {
av_log(NULL, AV_LOG_ERROR, "get_watermark_picture() Failed to open input file [%s]\n", ci->filename);
return -1;
}
}
/*
* This fills the streams field of the AVFormatContext with valid information.
*/
if(av_find_stream_info(ci->pFormatCtx)<0) {
av_log(NULL, AV_LOG_ERROR, "get_watermark_picture() Failed to find stream info\n");
return -1;
}
/*
* As mentioned in the introduction, we'll handle only video streams, not audio
* streams. To make things nice and easy, we simply use the first video stream we
* find.
*/
ci->videoStream=-1;
for(ci->i = 0; ci->i < ci->pFormatCtx->nb_streams; ci->i++)
if(ci->pFormatCtx->streams[ci->i]->codec->codec_type==CODEC_TYPE_VIDEO)
{
ci->videoStream = ci->i;
break;
}
if(ci->videoStream == -1) {
av_log(NULL, AV_LOG_ERROR, "get_watermark_picture() Failed to find any video stream\n");
return -1;
}
ci->st = ci->pFormatCtx->streams[ci->videoStream];
ci->x_size = ci->st->codec->width;
ci->y_size = ci->st->codec->height;
// Get a pointer to the codec context for the video stream
ci->pCodecCtx = ci->pFormatCtx->streams[ci->videoStream]->codec;
/*
* OK, so now we've got a pointer to the so-called codec context for our video
* stream, but we still have to find the actual codec and open it.
*/
// Find the decoder for the video stream
ci->pCodec = avcodec_find_decoder(ci->pCodecCtx->codec_id);
if(ci->pCodec == NULL) {
av_log(NULL, AV_LOG_ERROR, "get_watermark_picture() Failed to find any codec\n");
return -1;
}
// Open codec
if(avcodec_open(ci->pCodecCtx, ci->pCodec)<0) {
av_log(NULL, AV_LOG_ERROR, "get_watermark_picture() Failed to open codec\n");
return -1;
}
// Hack to correct wrong frame rates that seem to be generated by some
// codecs
if (ci->pCodecCtx->time_base.den>1000 && ci->pCodecCtx->time_base.num==1)
ci->pCodecCtx->time_base.num=1000;
/*
* Allocate a video frame to store the decoded images in.
*/
ci->pFrame = avcodec_alloc_frame();
/*
* The RGB image pFrameRGB (of type AVFrame *) is allocated like this:
*/
// Allocate an AVFrame structure
ci->pFrameRGB=avcodec_alloc_frame();
if(ci->pFrameRGB==NULL) {
av_log(NULL, AV_LOG_ERROR, "get_watermark_picture() Failed to alloc pFrameRGB\n");
return -1;
}
// Determine required buffer size and allocate buffer
ci->numBytes = avpicture_get_size(PIX_FMT_RGB32, ci->pCodecCtx->width,
ci->pCodecCtx->height);
ci->buffer = av_malloc(ci->numBytes);
// Assign appropriate parts of buffer to image planes in pFrameRGB
avpicture_fill((AVPicture *)ci->pFrameRGB, ci->buffer, PIX_FMT_RGB32,
ci->pCodecCtx->width, ci->pCodecCtx->height);
}
// TODO loop, pingpong etc?
if (0 == cleanup)
{
// av_log(NULL, AV_LOG_DEBUG, "get_watermark_picture() Get a frame\n");
while(av_read_frame(ci->pFormatCtx, &ci->packet)>=0)
{
// Is this a packet from the video stream?
if(ci->packet.stream_index == ci->videoStream)
{
// Decode video frame
avcodec_decode_video(ci->pCodecCtx, ci->pFrame, &ci->frameFinished,
ci->packet.data, ci->packet.size);
// Did we get a video frame?
if(ci->frameFinished)
{
// Convert the image from its native format to RGB32
ci->watermark_convert_ctx =
sws_getCachedContext(ci->watermark_convert_ctx,
ci->pCodecCtx->width, ci->pCodecCtx->height, ci->pCodecCtx->pix_fmt,
ci->pCodecCtx->width, ci->pCodecCtx->height, PIX_FMT_RGB32,
sws_flags, NULL, NULL, NULL);
if (ci->watermark_convert_ctx == NULL) {
av_log(NULL, AV_LOG_ERROR,
"Cannot initialize the watermark conversion context\n");
return -1;
}
// img_convert parameters are 2 first destination, then 4 source
// sws_scale parameters are context, 4 first source, then 2 destination
sws_scale(ci->watermark_convert_ctx,
ci->pFrame->data, ci->pFrame->linesize, 0, ci->pCodecCtx->height,
ci->pFrameRGB->data, ci->pFrameRGB->linesize);
// Process the video frame (save to disk etc.)
//fprintf(stderr,"banan() New frame!\n");
//DoSomethingWithTheImage(ci->pFrameRGB);
return 0;
}
}
// Free the packet that was allocated by av_read_frame
av_free_packet(&ci->packet);
}
ci->is_done = 1;
return 0;
} // if 0 != cleanup
if (0 != cleanup)
{
// Free the RGB image
av_freep(&ci->buffer);
av_freep(&ci->pFrameRGB);
// Close the codec
if (0 != ci->pCodecCtx) {
avcodec_close(ci->pCodecCtx);
ci->pCodecCtx = 0;
}
// Close the video file
if (0 != ci->pFormatCtx) {
av_close_input_file(ci->pFormatCtx);
ci->pFormatCtx = 0;
}
ci->is_done = 0;
}
return 0;
}
void parse_arg_file(const char *filename)
{
}
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