1 files changed, 367 insertions, 0 deletions

diff --git a/contrib/ffmpeg/vhook/ppm.c b/contrib/ffmpeg/vhook/ppm.c
new file mode 100644
index 000000000..9f618e55b
--- /dev/null
+++ b/contrib/ffmpeg/vhook/ppm.c
@@ -0,0 +1,367 @@
+/*
+ * PPM Video Hook
+ * Copyright (c) 2003 Charles Yates
+ *
+ * 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 <stdio.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <ctype.h>
+#include "framehook.h"
+#include "avformat.h"
+#include "swscale.h"
+
+static int sws_flags = SWS_BICUBIC;
+
+/** Bi-directional pipe structure.
+*/
+
+typedef struct rwpipe
+{
+    int pid;
+    FILE *reader;
+    FILE *writer;
+}
+rwpipe;
+
+/** Create a bidirectional pipe for the given command.
+*/
+
+static rwpipe *rwpipe_open( int argc, char *argv[] )
+{
+    rwpipe *this = av_mallocz( sizeof( rwpipe ) );
+
+    if ( this != NULL )
+    {
+        int input[ 2 ];
+        int output[ 2 ];
+
+        pipe( input );
+        pipe( output );
+
+        this->pid = fork();
+
+        if ( this->pid == 0 )
+        {
+#define COMMAND_SIZE 10240
+            char *command = av_mallocz( COMMAND_SIZE );
+            int i;
+
+            strcpy( command, "" );
+            for ( i = 0; i < argc; i ++ )
+            {
+                pstrcat( command, COMMAND_SIZE, argv[ i ] );
+                pstrcat( command, COMMAND_SIZE, " " );
+            }
+
+            dup2( output[ 0 ], STDIN_FILENO );
+            dup2( input[ 1 ], STDOUT_FILENO );
+
+            close( input[ 0 ] );
+            close( input[ 1 ] );
+            close( output[ 0 ] );
+            close( output[ 1 ] );
+
+            execl("/bin/sh", "sh", "-c", command, (char*)NULL );
+            _exit( 255 );
+        }
+        else
+        {
+            close( input[ 1 ] );
+            close( output[ 0 ] );
+
+            this->reader = fdopen( input[ 0 ], "r" );
+            this->writer = fdopen( output[ 1 ], "w" );
+        }
+    }
+
+    return this;
+}
+
+/** Read data from the pipe.
+*/
+
+static FILE *rwpipe_reader( rwpipe *this )
+{
+    if ( this != NULL )
+        return this->reader;
+    else
+        return NULL;
+}
+
+/** Write data to the pipe.
+*/
+
+static FILE *rwpipe_writer( rwpipe *this )
+{
+    if ( this != NULL )
+        return this->writer;
+    else
+        return NULL;
+}
+
+/* Read a number from the pipe - assumes PNM style headers.
+*/
+
+static int rwpipe_read_number( rwpipe *rw )
+{
+    int value = 0;
+    int c = 0;
+    FILE *in = rwpipe_reader( rw );
+
+    do
+    {
+        c = fgetc( in );
+
+        while( c != EOF && !isdigit( c ) && c != '#' )
+            c = fgetc( in );
+
+        if ( c == '#' )
+            while( c != EOF && c != '\n' )
+                c = fgetc( in );
+    }
+    while ( c != EOF && !isdigit( c ) );
+
+    while( c != EOF && isdigit( c ) )
+    {
+        value = value * 10 + ( c - '0' );
+        c = fgetc( in );
+    }
+
+    return value;
+}
+
+/** Read a PPM P6 header.
+*/
+
+static int rwpipe_read_ppm_header( rwpipe *rw, int *width, int *height )
+{
+    char line[ 3 ];
+    FILE *in = rwpipe_reader( rw );
+    int max;
+
+    fgets( line, 3, in );
+    if ( !strncmp( line, "P6", 2 ) )
+    {
+        *width = rwpipe_read_number( rw );
+        *height = rwpipe_read_number( rw );
+        max = rwpipe_read_number( rw );
+        return max != 255 || *width <= 0 || *height <= 0;
+    }
+    return 1;
+}
+
+/** Close the pipe and process.
+*/
+
+static void rwpipe_close( rwpipe *this )
+{
+    if ( this != NULL )
+    {
+        fclose( this->reader );
+        fclose( this->writer );
+        waitpid( this->pid, NULL, 0 );
+        av_free( this );
+    }
+}
+
+/** Context info for this vhook - stores the pipe and image buffers.
+*/
+
+typedef struct
+{
+    rwpipe *rw;
+    int size1;
+    char *buf1;
+    int size2;
+    char *buf2;
+
+    // This vhook first converts frame to RGB ...
+    struct SwsContext *toRGB_convert_ctx;
+    // ... then processes it via a PPM command pipe ...
+    // ... and finally converts back frame from RGB to initial format
+    struct SwsContext *fromRGB_convert_ctx;
+}
+ContextInfo;
+
+/** Initialise the context info for this vhook.
+*/
+
+int Configure(void **ctxp, int argc, char *argv[])
+{
+    if ( argc > 1 )
+    {
+        *ctxp = av_mallocz(sizeof(ContextInfo));
+        if ( ctxp != NULL && argc > 1 )
+        {
+            ContextInfo *info = (ContextInfo *)*ctxp;
+            info->rw = rwpipe_open( argc - 1, &argv[ 1 ] );
+            return 0;
+        }
+    }
+    return 1;
+}
+
+/** Process a frame.
+*/
+
+void Process(void *ctx, AVPicture *picture, enum PixelFormat pix_fmt, int width, int height, int64_t pts)
+{
+    int err = 0;
+    ContextInfo *ci = (ContextInfo *) ctx;
+    AVPicture picture1;
+    AVPicture picture2;
+    AVPicture *pict = picture;
+    int out_width;
+    int out_height;
+    int i;
+    uint8_t *ptr = NULL;
+    FILE *in = rwpipe_reader( ci->rw );
+    FILE *out = rwpipe_writer( ci->rw );
+
+    /* Check that we have a pipe to talk to. */
+    if ( in == NULL || out == NULL )
+        err = 1;
+
+    /* Convert to RGB24 if necessary */
+    if ( !err && pix_fmt != PIX_FMT_RGB24 )
+    {
+        int size = avpicture_get_size(PIX_FMT_RGB24, width, height);
+
+        if ( size != ci->size1 )
+        {
+            av_free( ci->buf1 );
+            ci->buf1 = av_malloc(size);
+            ci->size1 = size;
+            err = ci->buf1 == NULL;
+        }
+
+        if ( !err )
+        {
+            avpicture_fill(&picture1, ci->buf1, PIX_FMT_RGB24, width, 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,
+                                        width, height, pix_fmt,
+                                        width, height, PIX_FMT_RGB24,
+                                        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, height,
+                     picture1.data, picture1.linesize);
+
+            pict = &picture1;
+        }
+    }
+
+    /* Write out the PPM */
+    if ( !err )
+    {
+        ptr = pict->data[ 0 ];
+        fprintf( out, "P6\n%d %d\n255\n", width, height );
+        for ( i = 0; !err && i < height; i ++ )
+        {
+            err = !fwrite( ptr, width * 3, 1, out );
+            ptr += pict->linesize[ 0 ];
+        }
+        if ( !err )
+            err = fflush( out );
+    }
+
+    /* Read the PPM returned. */
+    if ( !err && !rwpipe_read_ppm_header( ci->rw, &out_width, &out_height ) )
+    {
+        int size = avpicture_get_size(PIX_FMT_RGB24, out_width, out_height);
+
+        if ( size != ci->size2 )
+        {
+            av_free( ci->buf2 );
+            ci->buf2 = av_malloc(size);
+            ci->size2 = size;
+            err = ci->buf2 == NULL;
+        }
+
+        if ( !err )
+        {
+            avpicture_fill(&picture2, ci->buf2, PIX_FMT_RGB24, out_width, out_height);
+            ptr = picture2.data[ 0 ];
+            for ( i = 0; !err && i < out_height; i ++ )
+            {
+                err = !fread( ptr, out_width * 3, 1, in );
+                ptr += picture2.linesize[ 0 ];
+            }
+        }
+    }
+
+    /* Convert the returned PPM back to the input format */
+    if ( !err )
+    {
+        /* The out_width/out_height returned from the PPM
+         * filter won't necessarily be the same as width and height
+         * but it will be scaled anyway to width/height.
+         */
+        av_log(NULL, AV_LOG_DEBUG,
+                  "PPM vhook: Input dimensions: %d x %d Output dimensions: %d x %d\n",
+                  width, height, out_width, out_height);
+        ci->fromRGB_convert_ctx = sws_getCachedContext(ci->fromRGB_convert_ctx,
+                                        out_width, out_height, PIX_FMT_RGB24,
+                                        width,     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,
+                 picture2.data, picture2.linesize, 0, out_height,
+                 picture->data, picture->linesize);
+    }
+}
+
+/** Clean up the effect.
+*/
+
+void Release(void *ctx)
+{
+    ContextInfo *ci;
+    ci = (ContextInfo *) ctx;
+
+    if (ctx)
+    {
+        rwpipe_close( ci->rw );
+        av_free( ci->buf1 );
+        av_free( ci->buf2 );
+        sws_freeContext(ci->toRGB_convert_ctx);
+        sws_freeContext(ci->fromRGB_convert_ctx);
+        av_free(ctx);
+    }
+}
+