x264 source for verification 2026-05-22

output/flv_bytestream.c

@@ -0,0 +1,153 @@
+/*****************************************************************************
+ * flv_bytestream.c: flv muxer utilities
+ *****************************************************************************
+ * Copyright (C) 2009-2025 x264 project
+ *
+ * Authors: Kieran Kunhya <kieran@kunhya.com>
+ *
+ * This program 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.
+ *
+ * This program 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 this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02111, USA.
+ *
+ * This program is also available under a commercial proprietary license.
+ * For more information, contact us at licensing@x264.com.
+ *****************************************************************************/
+
+#include "output.h"
+#include "flv_bytestream.h"
+
+uint64_t flv_dbl2int( double value )
+{
+    return (union {double f; uint64_t i;}){value}.i;
+}
+
+/* Put functions  */
+
+void flv_put_byte( flv_buffer *c, uint8_t b )
+{
+    flv_append_data( c, &b, 1 );
+}
+
+void flv_put_be32( flv_buffer *c, uint32_t val )
+{
+    flv_put_byte( c, val >> 24 );
+    flv_put_byte( c, val >> 16 );
+    flv_put_byte( c, val >> 8 );
+    flv_put_byte( c, val );
+}
+
+void flv_put_be64( flv_buffer *c, uint64_t val )
+{
+    flv_put_be32( c, val >> 32 );
+    flv_put_be32( c, val );
+}
+
+void flv_put_be16( flv_buffer *c, uint16_t val )
+{
+    flv_put_byte( c, val >> 8 );
+    flv_put_byte( c, val );
+}
+
+void flv_put_be24( flv_buffer *c, uint32_t val )
+{
+    flv_put_be16( c, val >> 8 );
+    flv_put_byte( c, val );
+}
+
+void flv_put_tag( flv_buffer *c, const char *tag )
+{
+    while( *tag )
+        flv_put_byte( c, *tag++ );
+}
+
+void flv_put_amf_string( flv_buffer *c, const char *str )
+{
+    uint16_t len = strlen( str );
+    flv_put_be16( c, len );
+    flv_append_data( c, (uint8_t*)str, len );
+}
+
+void flv_put_amf_double( flv_buffer *c, double d )
+{
+    flv_put_byte( c, AMF_DATA_TYPE_NUMBER );
+    flv_put_be64( c, flv_dbl2int( d ) );
+}
+
+/* flv writing functions */
+
+flv_buffer *flv_create_writer( const char *filename )
+{
+    flv_buffer *c = calloc( 1, sizeof(flv_buffer) );
+    if( !c )
+        return NULL;
+
+    if( !strcmp( filename, "-" ) )
+        c->fp = stdout;
+    else
+        c->fp = x264_fopen( filename, "wb" );
+    if( !c->fp )
+    {
+        free( c );
+        return NULL;
+    }
+
+    return c;
+}
+
+int flv_append_data( flv_buffer *c, uint8_t *data, unsigned size )
+{
+    unsigned ns = c->d_cur + size;
+
+    if( ns > c->d_max )
+    {
+        void *dp;
+        unsigned dn = 16;
+        while( ns > dn )
+            dn <<= 1;
+
+        dp = realloc( c->data, dn );
+        if( !dp )
+            return -1;
+
+        c->data = dp;
+        c->d_max = dn;
+    }
+
+    memcpy( c->data + c->d_cur, data, size );
+
+    c->d_cur = ns;
+
+    return 0;
+}
+
+void flv_rewrite_amf_be24( flv_buffer *c, unsigned length, unsigned start )
+{
+     *(c->data + start + 0) = length >> 16;
+     *(c->data + start + 1) = length >> 8;
+     *(c->data + start + 2) = length >> 0;
+}
+
+int flv_flush_data( flv_buffer *c )
+{
+    if( !c->d_cur )
+        return 0;
+
+    if( fwrite( c->data, c->d_cur, 1, c->fp ) != 1 )
+        return -1;
+
+    c->d_total += c->d_cur;
+
+    c->d_cur = 0;
+
+    return 0;
+}