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ffmpeg / vhook / watermark.c @ 5509bffa

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/*
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 * Watermark Hook
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 * Copyright (c) 2005 Marcus Engene myfirstname(at)mylastname.se
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 *
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 * The watermarkpicture works like this. (Assuming colorintencities 0..0xff)
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 * Per color do this:
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 * If mask color is 0x80, no change to original frame.
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 * If mask color is < 0x80 the abs difference is subtracted from frame. If
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 * result < 0, result = 0
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 * If mask color is > 0x80 the abs difference is added to frame. If result
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 * > 0xff, result = 0xff
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 *
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 * This way a mask that is visible both in light pictures and in dark can be
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 * made (fex by using a picture generated by gimp and the bump map tool).
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 *
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 * An example watermark file is at
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 * http://engene.se/ffmpeg_watermark.gif
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 *
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 * Example usage:
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 *  ffmpeg -i infile -vhook '/path/watermark.so -f wm.gif' out.mov
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 *
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 * Note that the entire vhook argument is encapsulated in ''. This
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 * way, arguments to the vhook won't be mixed up with those to ffmpeg.
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 *
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 * This library is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2 of the License, or (at your option) any later version.
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 *
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 * This library is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with this library; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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//#include <stdlib.h>
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//#include <fcntl.h>
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#include <unistd.h>
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#include <stdarg.h>
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#include "common.h"
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#include "avformat.h"
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#include "framehook.h"
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typedef struct {
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    char            filename[2000];
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    int             x_size;
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    int             y_size;
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    /* get_watermark_picture() variables */
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    AVFormatContext *pFormatCtx;
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    const char     *p_ext;
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    int             videoStream;
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    int             frameFinished;
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    AVCodecContext *pCodecCtx;
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    AVCodec        *pCodec;
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    AVFrame        *pFrame;
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    AVPacket        packet;
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    int             numBytes;
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    uint8_t        *buffer;
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    int             i;
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    AVInputFormat  *file_iformat;
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    AVStream       *st;
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    int             is_done;
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    AVFrame        *pFrameRGB;
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} ContextInfo;
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int get_watermark_picture(ContextInfo *ci, int cleanup);
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/****************************************************************************
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 *
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 ****************************************************************************/
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void Release(void *ctx)
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{
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    ContextInfo *ci;
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    ci = (ContextInfo *) ctx;
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    if (ci) get_watermark_picture(ci, 1);
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    if (ctx)
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        av_free(ctx);
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}
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/****************************************************************************
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 *
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 ****************************************************************************/
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int Configure(void **ctxp, int argc, char *argv[])
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{
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    ContextInfo *ci;
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    int c;
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    if (0 == (*ctxp = av_mallocz(sizeof(ContextInfo)))) return -1;
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    ci = (ContextInfo *) *ctxp;
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    optind = 1;
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    // Struct is mallocz:ed so no need to reset.
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    while ((c = getopt(argc, argv, "f:")) > 0) {
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        switch (c) {
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            case 'f':
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                strncpy(ci->filename, optarg, 1999);
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                ci->filename[1999] = 0;
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                break;
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            default:
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                av_log(NULL, AV_LOG_ERROR, "Watermark: Unrecognized argument '%s'\n", argv[optind]);
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                return -1;
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        }
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    }
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    //
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    if (0 == ci->filename[0]) {
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        av_log(NULL, AV_LOG_ERROR, "Watermark: There is no filename specified.\n");
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        return -1;
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    }
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    av_register_all();
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    return get_watermark_picture(ci, 0);
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}
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/****************************************************************************
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 * Why is this a void returning functions? I want to be able to go wrong!
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 ****************************************************************************/
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void Process(void *ctx,
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             AVPicture *picture,
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             enum PixelFormat pix_fmt,
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             int src_width,
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             int src_height,
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             int64_t pts)
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{
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    ContextInfo *ci = (ContextInfo *) ctx;
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    char *buf = 0;
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    AVPicture picture1;
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    AVPicture *pict = picture;
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    AVFrame *pFrameRGB;
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    int xm_size;
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    int ym_size;
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//    int retval = -1;
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    int x;
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    int y;
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    int offs, offsm;
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    int mpoffs;
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    uint32_t *p_pixel = 0;
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    uint32_t pixel_meck;
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    uint32_t pixel;
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    uint32_t pixelm;
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    int tmp;
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//??    (void) ci;
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    if (pix_fmt != PIX_FMT_RGBA32) {
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        int size;
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        size = avpicture_get_size(PIX_FMT_RGBA32, src_width, src_height);
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        buf = av_malloc(size);
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        avpicture_fill(&picture1, buf, PIX_FMT_RGBA32, src_width, src_height);
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        if (img_convert(&picture1, PIX_FMT_RGBA32,
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                        picture, pix_fmt, src_width, src_height) < 0) {
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            av_free(buf);
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            return;
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        }
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        pict = &picture1;
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    }
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    /* Insert filter code here */ /* ok */
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    // Get me next frame
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    if (0 > get_watermark_picture(ci, 0)) {
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        return;
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    }
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    // These are the three original static variables in the ffmpeg hack.
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    pFrameRGB = ci->pFrameRGB;
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    xm_size = ci->x_size;
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    ym_size = ci->y_size;
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    // I'll do the *4 => <<2 crap later. Most compilers understand that anyway.
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    // According to avcodec.h PIX_FMT_RGBA32 is handled in endian specific manner.
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    for (y=0; y<src_height; y++) {
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        offs = y * (src_width * 4);
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        offsm = (((y * ym_size) / src_height) * 4) * xm_size; // offsm first in maskline. byteoffs!
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        for (x=0; x<src_width; x++) {
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            mpoffs = offsm + (((x * xm_size) / src_width) * 4);
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            p_pixel = (uint32_t *)&((pFrameRGB->data[0])[mpoffs]);
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            pixelm = *p_pixel;
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            p_pixel = (uint32_t *)&((pict->data[0])[offs]);
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            pixel = *p_pixel;
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//          pixelm = *((uint32_t *)&(pFrameRGB->data[mpoffs]));
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            pixel_meck = pixel & 0xff000000;
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            // R
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            tmp = (int)((pixel >> 16) & 0xff) + (int)((pixelm >> 16) & 0xff) - 0x80;
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            if (tmp > 255) tmp = 255;
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            if (tmp < 0) tmp = 0;
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            pixel_meck |= (tmp << 16) & 0xff0000;
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            // G
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            tmp = (int)((pixel >> 8) & 0xff) + (int)((pixelm >> 8) & 0xff) - 0x80;
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            if (tmp > 255) tmp = 255;
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            if (tmp < 0) tmp = 0;
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            pixel_meck |= (tmp << 8) & 0xff00;
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            // B
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            tmp = (int)((pixel >> 0) & 0xff) + (int)((pixelm >> 0) & 0xff) - 0x80;
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            if (tmp > 255) tmp = 255;
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            if (tmp < 0) tmp = 0;
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            pixel_meck |= (tmp << 0) & 0xff;
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            // test:
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            //pixel_meck = pixel & 0xff000000;
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            //pixel_meck |= (pixelm & 0x00ffffff);
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            *p_pixel = pixel_meck;
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            offs += 4;
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        } // foreach X
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    } // foreach Y
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    if (pix_fmt != PIX_FMT_RGBA32) {
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        if (img_convert(picture, pix_fmt,
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                        &picture1, PIX_FMT_RGBA32, src_width, src_height) < 0) {
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        }
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    }
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    av_free(buf);
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}
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/****************************************************************************
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 * When cleanup == 0, we try to get the next frame. If no next frame, nothing
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 * is done.
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 *
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 * This code follows the example on
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 * http://www.inb.uni-luebeck.de/~boehme/using_libavcodec.html
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 *
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 * 0 = ok, -1 = error
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 ****************************************************************************/
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int get_watermark_picture(ContextInfo *ci, int cleanup)
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{
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    if (1 == ci->is_done && 0 == cleanup) return 0;
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    // Yes, *pFrameRGB arguments must be null the first time otherwise it's not good..
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    // This block is only executed the first time we enter this function.
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    if (0 == ci->pFrameRGB &&
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        0 == cleanup)
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    {
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        /*
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         * The last three parameters specify the file format, buffer size and format
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         * parameters; by simply specifying NULL or 0 we ask libavformat to auto-detect
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         * the format and use a default buffer size. (Didn't work!)
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         */
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        if (av_open_input_file(&ci->pFormatCtx, ci->filename, NULL, 0, NULL) != 0) {
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            // Martin says this should not be necessary but it failed for me sending in
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            // NULL instead of file_iformat to av_open_input_file()
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            ci->i = strlen(ci->filename);
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            if (0 == ci->i) {
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                av_log(NULL, AV_LOG_ERROR, "get_watermark_picture() No filename to watermark vhook\n");
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                return -1;
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            }
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            while (ci->i > 0) {
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                if (ci->filename[ci->i] == '.') {
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                    ci->i++;
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                    break;
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                }
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                ci->i--;
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            }
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               ci->p_ext = &(ci->filename[ci->i]);
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            ci->file_iformat = av_find_input_format (ci->p_ext);
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            if (0 == ci->file_iformat) {
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                av_log(NULL, AV_LOG_ERROR, "get_watermark_picture() Really failed to find iformat [%s]\n", ci->p_ext);
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                return -1;
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            }
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            // now continues the Martin template.
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            if (av_open_input_file(&ci->pFormatCtx, ci->filename, ci->file_iformat, 0, NULL)!=0) {
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                av_log(NULL, AV_LOG_ERROR, "get_watermark_picture() Failed to open input file [%s]\n", ci->filename);
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                return -1;
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            }
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        }
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        /*
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         * This fills the streams field of the AVFormatContext with valid information.
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         */
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        if(av_find_stream_info(ci->pFormatCtx)<0) {
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            av_log(NULL, AV_LOG_ERROR, "get_watermark_picture() Failed to find stream info\n");
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            return -1;
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        }
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        /*
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         * As mentioned in the introduction, we'll handle only video streams, not audio
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         * streams. To make things nice and easy, we simply use the first video stream we
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         * find.
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         */
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        ci->videoStream=-1;
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        for(ci->i = 0; ci->i < ci->pFormatCtx->nb_streams; ci->i++)
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            if(ci->pFormatCtx->streams[ci->i]->codec->codec_type==CODEC_TYPE_VIDEO)
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            {
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                ci->videoStream = ci->i;
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                break;
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            }
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        if(ci->videoStream == -1) {
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            av_log(NULL, AV_LOG_ERROR, "get_watermark_picture() Failed to find any video stream\n");
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            return -1;
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        }
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        ci->st = ci->pFormatCtx->streams[ci->videoStream];
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        ci->x_size = ci->st->codec->width;
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        ci->y_size = ci->st->codec->height;
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        // Get a pointer to the codec context for the video stream
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        ci->pCodecCtx = ci->pFormatCtx->streams[ci->videoStream]->codec;
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        /*
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         * OK, so now we've got a pointer to the so-called codec context for our video
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         * stream, but we still have to find the actual codec and open it.
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         */
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        // Find the decoder for the video stream
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        ci->pCodec = avcodec_find_decoder(ci->pCodecCtx->codec_id);
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        if(ci->pCodec == NULL) {
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            av_log(NULL, AV_LOG_ERROR, "get_watermark_picture() Failed to find any codec\n");
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            return -1;
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        }
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        // Inform the codec that we can handle truncated bitstreams -- i.e.,
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        // bitstreams where frame boundaries can fall in the middle of packets
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        if (ci->pCodec->capabilities & CODEC_CAP_TRUNCATED)
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            ci->pCodecCtx->flags|=CODEC_FLAG_TRUNCATED;
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        // Open codec
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        if(avcodec_open(ci->pCodecCtx, ci->pCodec)<0) {
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            av_log(NULL, AV_LOG_ERROR, "get_watermark_picture() Failed to open codec\n");
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            return -1;
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        }
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        // Hack to correct wrong frame rates that seem to be generated by some
352
        // codecs
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        if (ci->pCodecCtx->time_base.den>1000 && ci->pCodecCtx->time_base.num==1)
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            ci->pCodecCtx->time_base.num=1000;
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        /*
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         * Allocate a video frame to store the decoded images in.
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         */
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        ci->pFrame = avcodec_alloc_frame();
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362
        /*
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         * The RGB image pFrameRGB (of type AVFrame *) is allocated like this:
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         */
365
        // Allocate an AVFrame structure
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        ci->pFrameRGB=avcodec_alloc_frame();
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        if(ci->pFrameRGB==NULL) {
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            av_log(NULL, AV_LOG_ERROR, "get_watermark_picture() Failed to alloc pFrameRGB\n");
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            return -1;
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        }
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        // Determine required buffer size and allocate buffer
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        ci->numBytes = avpicture_get_size(PIX_FMT_RGBA32, ci->pCodecCtx->width,
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            ci->pCodecCtx->height);
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        ci->buffer = av_malloc(ci->numBytes);
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        // Assign appropriate parts of buffer to image planes in pFrameRGB
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        avpicture_fill((AVPicture *)ci->pFrameRGB, ci->buffer, PIX_FMT_RGBA32,
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            ci->pCodecCtx->width, ci->pCodecCtx->height);
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    }
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    // TODO loop, pingpong etc?
382
    if (0 == cleanup)
383
    {
384
//        av_log(NULL, AV_LOG_DEBUG, "get_watermark_picture() Get a frame\n");
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        while(av_read_frame(ci->pFormatCtx, &ci->packet)>=0)
386
        {
387
            // Is this a packet from the video stream?
388
            if(ci->packet.stream_index == ci->videoStream)
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            {
390
                // Decode video frame
391
                avcodec_decode_video(ci->pCodecCtx, ci->pFrame, &ci->frameFinished,
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                    ci->packet.data, ci->packet.size);
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                // Did we get a video frame?
395
                if(ci->frameFinished)
396
                {
397
                    // Convert the image from its native format to RGBA32
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                    img_convert((AVPicture *)ci->pFrameRGB, PIX_FMT_RGBA32,
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                        (AVPicture*)(ci->pFrame), ci->pCodecCtx->pix_fmt, ci->pCodecCtx->width,
400
                        ci->pCodecCtx->height);
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                    // Process the video frame (save to disk etc.)
403
                    //fprintf(stderr,"banan() New frame!\n");
404
                    //DoSomethingWithTheImage(ci->pFrameRGB);
405
                    return 0;
406
                }
407
            }
408

    
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            // Free the packet that was allocated by av_read_frame
410
            av_free_packet(&ci->packet);
411
        }
412
        ci->is_done = 1;
413
        return 0;
414
    } // if 0 != cleanup
415

    
416
    if (0 != cleanup)
417
    {
418
        // Free the RGB image
419
        if (0 != ci->buffer) {
420
            av_free(ci->buffer);
421
            ci->buffer = 0;
422
        }
423
        if (0 != ci->pFrameRGB) {
424
            av_free(ci->pFrameRGB);
425
            ci->pFrameRGB = 0;
426
        }
427

    
428
        // Close the codec
429
        if (0 != ci->pCodecCtx) {
430
            avcodec_close(ci->pCodecCtx);
431
            ci->pCodecCtx = 0;
432
        }
433

    
434
        // Close the video file
435
        if (0 != ci->pFormatCtx) {
436
            av_close_input_file(ci->pFormatCtx);
437
            ci->pFormatCtx = 0;
438
        }
439

    
440
        ci->is_done = 0;
441
    }
442
    return 0;
443
}
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445

    
446
void parse_arg_file(const char *filename)
447
{
448
}