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1068 lines
32 KiB
1068 lines
32 KiB
/*
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* producer_avformat.c -- avformat producer
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* Copyright (C) 2003-2004 Ushodaya Enterprises Limited
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* Author: Charles Yates <charles.yates@pandora.be>
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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 2.1 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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// Local header files
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#include "producer_avformat.h"
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// MLT Header files
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#include <framework/mlt_frame.h>
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// ffmpeg Header files
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#include <avformat.h>
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#ifdef SWSCALE
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#include <swscale.h>
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#endif
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// System header files
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#include <stdlib.h>
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#include <string.h>
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#include <pthread.h>
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#include <math.h>
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void avformat_lock( );
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void avformat_unlock( );
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// Forward references.
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static int producer_open( mlt_producer this, char *file );
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static int producer_get_frame( mlt_producer this, mlt_frame_ptr frame, int index );
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/** Constructor for libavformat.
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*/
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mlt_producer producer_avformat_init( char *file )
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{
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mlt_producer this = NULL;
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// Check that we have a non-NULL argument
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if ( file != NULL )
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{
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// Construct the producer
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this = calloc( 1, sizeof( struct mlt_producer_s ) );
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// Initialise it
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if ( mlt_producer_init( this, NULL ) == 0 )
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{
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// Get the properties
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mlt_properties properties = MLT_PRODUCER_PROPERTIES( this );
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// Set the resource property (required for all producers)
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mlt_properties_set( properties, "resource", file );
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// Register our get_frame implementation
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this->get_frame = producer_get_frame;
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// Open the file
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if ( producer_open( this, file ) != 0 )
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{
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// Clean up
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mlt_producer_close( this );
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this = NULL;
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}
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}
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}
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return this;
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}
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/** Find the default streams.
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*/
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static void find_default_streams( AVFormatContext *context, int *audio_index, int *video_index )
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{
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int i;
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// Allow for multiple audio and video streams in the file and select first of each (if available)
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for( i = 0; i < context->nb_streams; i++ )
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{
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// Get the codec context
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AVCodecContext *codec_context = context->streams[ i ]->codec;
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if ( avcodec_find_decoder( codec_context->codec_id ) == NULL )
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continue;
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// Determine the type and obtain the first index of each type
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switch( codec_context->codec_type )
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{
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case CODEC_TYPE_VIDEO:
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if ( *video_index < 0 )
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*video_index = i;
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break;
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case CODEC_TYPE_AUDIO:
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if ( *audio_index < 0 )
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*audio_index = i;
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break;
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default:
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break;
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}
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}
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}
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/** Producer file destructor.
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*/
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static void producer_file_close( void *context )
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{
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if ( context != NULL )
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{
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// Lock the mutex now
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avformat_lock( );
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// Close the file
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av_close_input_file( context );
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// Unlock the mutex now
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avformat_unlock( );
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}
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}
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/** Producer file destructor.
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*/
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static void producer_codec_close( void *codec )
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{
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if ( codec != NULL )
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{
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// Lock the mutex now
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avformat_lock( );
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// Close the file
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avcodec_close( codec );
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// Unlock the mutex now
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avformat_unlock( );
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}
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}
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/** Open the file.
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*/
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static int producer_open( mlt_producer this, char *file )
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{
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// Return an error code (0 == no error)
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int error = 0;
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// Context for avformat
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AVFormatContext *context = NULL;
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// Get the properties
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mlt_properties properties = MLT_PRODUCER_PROPERTIES( this );
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// We will treat everything with the producer fps
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double fps = mlt_producer_get_fps( this );
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// Lock the mutex now
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avformat_lock( );
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// If "MRL", then create AVInputFormat
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AVInputFormat *format = NULL;
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AVFormatParameters *params = NULL;
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char *standard = NULL;
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char *mrl = strchr( file, ':' );
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// AV option (0 = both, 1 = video, 2 = audio)
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int av = 0;
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// Setting lowest log level
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av_log_set_level( -1 );
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// Only if there is not a protocol specification that avformat can handle
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if ( mrl && !url_exist( file ) )
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{
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// 'file' becomes format abbreviation
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mrl[0] = 0;
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// Lookup the format
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format = av_find_input_format( file );
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// Eat the format designator
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file = ++mrl;
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if ( format )
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{
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// Allocate params
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params = calloc( sizeof( AVFormatParameters ), 1 );
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// These are required by video4linux (defaults)
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params->width = 640;
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params->height = 480;
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params->time_base= (AVRational){1,25};
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// params->device = file;
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params->channels = 2;
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params->sample_rate = 48000;
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}
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// XXX: this does not work anymore since avdevice
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// TODO: make producer_avddevice?
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// Parse out params
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mrl = strchr( file, '?' );
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while ( mrl )
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{
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mrl[0] = 0;
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char *name = strdup( ++mrl );
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char *value = strchr( name, ':' );
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if ( value )
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{
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value[0] = 0;
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value++;
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char *t = strchr( value, '&' );
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if ( t )
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t[0] = 0;
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if ( !strcmp( name, "frame_rate" ) )
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params->time_base.den = atoi( value );
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else if ( !strcmp( name, "frame_rate_base" ) )
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params->time_base.num = atoi( value );
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else if ( !strcmp( name, "sample_rate" ) )
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params->sample_rate = atoi( value );
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else if ( !strcmp( name, "channels" ) )
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params->channels = atoi( value );
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else if ( !strcmp( name, "width" ) )
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params->width = atoi( value );
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else if ( !strcmp( name, "height" ) )
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params->height = atoi( value );
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else if ( !strcmp( name, "standard" ) )
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{
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standard = strdup( value );
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params->standard = standard;
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}
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else if ( !strcmp( name, "av" ) )
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av = atoi( value );
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}
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free( name );
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mrl = strchr( mrl, '&' );
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}
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}
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// Now attempt to open the file
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error = av_open_input_file( &context, file, format, 0, params ) < 0;
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// Cleanup AVFormatParameters
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free( standard );
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free( params );
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// If successful, then try to get additional info
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if ( error == 0 )
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{
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// Get the stream info
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error = av_find_stream_info( context ) < 0;
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// Continue if no error
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if ( error == 0 )
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{
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// We will default to the first audio and video streams found
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int audio_index = -1;
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int video_index = -1;
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int av_bypass = 0;
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// Now set properties where we can (use default unknowns if required)
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if ( context->duration != AV_NOPTS_VALUE )
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{
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// This isn't going to be accurate for all formats
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mlt_position frames = ( mlt_position )( ( ( double )context->duration / ( double )AV_TIME_BASE ) * fps + 0.5 );
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mlt_properties_set_position( properties, "out", frames - 1 );
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mlt_properties_set_position( properties, "length", frames );
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}
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// Find default audio and video streams
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find_default_streams( context, &audio_index, &video_index );
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if ( context->start_time != AV_NOPTS_VALUE )
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mlt_properties_set_double( properties, "_start_time", context->start_time );
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// Check if we're seekable (something funny about mpeg here :-/)
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if ( strcmp( file, "pipe:" ) && strncmp( file, "http://", 6 ) )
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{
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mlt_properties_set_int( properties, "seekable", av_seek_frame( context, -1, mlt_properties_get_double( properties, "_start_time" ), AVSEEK_FLAG_BACKWARD ) >= 0 );
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mlt_properties_set_data( properties, "dummy_context", context, 0, producer_file_close, NULL );
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av_open_input_file( &context, file, NULL, 0, NULL );
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av_find_stream_info( context );
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}
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else
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av_bypass = 1;
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// Store selected audio and video indexes on properties
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mlt_properties_set_int( properties, "audio_index", audio_index );
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mlt_properties_set_int( properties, "video_index", video_index );
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mlt_properties_set_int( properties, "_last_position", -1 );
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// Fetch the width, height and aspect ratio
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if ( video_index != -1 )
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{
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AVCodecContext *codec_context = context->streams[ video_index ]->codec;
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mlt_properties_set_int( properties, "width", codec_context->width );
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mlt_properties_set_int( properties, "height", codec_context->height );
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mlt_properties_set_double( properties, "aspect_ratio", av_q2d( codec_context->sample_aspect_ratio ) );
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}
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// Read Metadata
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if (context->title != NULL)
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mlt_properties_set(properties, "meta.attr.title.markup", context->title );
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if (context->author != NULL)
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mlt_properties_set(properties, "meta.attr.author.markup", context->author );
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if (context->copyright != NULL)
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mlt_properties_set(properties, "meta.attr.copyright.markup", context->copyright );
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if (context->comment != NULL)
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mlt_properties_set(properties, "meta.attr.comment.markup", context->comment );
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if (context->album != NULL)
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mlt_properties_set(properties, "meta.attr.album.markup", context->album );
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if (context->year != 0)
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mlt_properties_set_int(properties, "meta.attr.year.markup", context->year );
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if (context->track != 0)
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mlt_properties_set_int(properties, "meta.attr.track.markup", context->track );
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// We're going to cheat here - for a/v files, we will have two contexts (reasoning will be clear later)
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if ( av == 0 && !av_bypass && audio_index != -1 && video_index != -1 )
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{
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// We'll use the open one as our video_context
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mlt_properties_set_data( properties, "video_context", context, 0, producer_file_close, NULL );
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// And open again for our audio context
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av_open_input_file( &context, file, NULL, 0, NULL );
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av_find_stream_info( context );
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// Audio context
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mlt_properties_set_data( properties, "audio_context", context, 0, producer_file_close, NULL );
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}
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else if ( av != 2 && video_index != -1 )
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{
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// We only have a video context
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mlt_properties_set_data( properties, "video_context", context, 0, producer_file_close, NULL );
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}
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else if ( audio_index != -1 )
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{
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// We only have an audio context
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mlt_properties_set_data( properties, "audio_context", context, 0, producer_file_close, NULL );
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}
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else
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{
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// Something has gone wrong
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error = -1;
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}
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mlt_properties_set_int( properties, "av_bypass", av_bypass );
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}
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}
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// Unlock the mutex now
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avformat_unlock( );
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return error;
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}
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/** Convert a frame position to a time code.
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*/
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static double producer_time_of_frame( mlt_producer this, mlt_position position )
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{
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return ( double )position / mlt_producer_get_fps( this );
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}
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static inline void convert_image( AVFrame *frame, uint8_t *buffer, int pix_fmt, mlt_image_format format, int width, int height )
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{
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#ifdef SWSCALE
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if ( format == mlt_image_yuv420p )
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{
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struct SwsContext *context = sws_getContext( width, height, pix_fmt,
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width, height, PIX_FMT_YUV420P, SWS_FAST_BILINEAR, NULL, NULL, NULL);
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AVPicture output;
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output.data[0] = buffer;
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output.data[1] = buffer + width * height;
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output.data[2] = buffer + ( 3 * width * height ) / 2;
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output.linesize[0] = width;
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output.linesize[1] = width >> 1;
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output.linesize[2] = width >> 1;
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sws_scale( context, frame->data, frame->linesize, 0, height,
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output.data, output.linesize);
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sws_freeContext( context );
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}
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else if ( format == mlt_image_rgb24 )
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{
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struct SwsContext *context = sws_getContext( width, height, pix_fmt,
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width, height, PIX_FMT_RGB24, SWS_FAST_BILINEAR, NULL, NULL, NULL);
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AVPicture output;
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avpicture_fill( &output, buffer, PIX_FMT_RGB24, width, height );
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sws_scale( context, frame->data, frame->linesize, 0, height,
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output.data, output.linesize);
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sws_freeContext( context );
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}
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else
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{
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struct SwsContext *context = sws_getContext( width, height, pix_fmt,
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width, height, PIX_FMT_YUYV422, SWS_FAST_BILINEAR, NULL, NULL, NULL);
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AVPicture output;
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avpicture_fill( &output, buffer, PIX_FMT_YUYV422, width, height );
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sws_scale( context, frame->data, frame->linesize, 0, height,
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output.data, output.linesize);
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sws_freeContext( context );
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}
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#else
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if ( format == mlt_image_yuv420p )
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{
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AVPicture pict;
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pict.data[0] = buffer;
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pict.data[1] = buffer + width * height;
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pict.data[2] = buffer + ( 3 * width * height ) / 2;
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pict.linesize[0] = width;
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pict.linesize[1] = width >> 1;
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pict.linesize[2] = width >> 1;
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img_convert( &pict, PIX_FMT_YUV420P, (AVPicture *)frame, pix_fmt, width, height );
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}
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else if ( format == mlt_image_rgb24 )
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{
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AVPicture output;
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avpicture_fill( &output, buffer, PIX_FMT_RGB24, width, height );
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img_convert( &output, PIX_FMT_RGB24, (AVPicture *)frame, pix_fmt, width, height );
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}
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else
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{
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AVPicture output;
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avpicture_fill( &output, buffer, PIX_FMT_YUV422, width, height );
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img_convert( &output, PIX_FMT_YUV422, (AVPicture *)frame, pix_fmt, width, height );
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}
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#endif
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}
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/** Get an image from a frame.
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*/
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static int producer_get_image( mlt_frame frame, uint8_t **buffer, mlt_image_format *format, int *width, int *height, int writable )
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{
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// Get the properties from the frame
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mlt_properties frame_properties = MLT_FRAME_PROPERTIES( frame );
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// Obtain the frame number of this frame
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mlt_position position = mlt_properties_get_position( frame_properties, "avformat_position" );
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// Get the producer
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mlt_producer this = mlt_properties_get_data( frame_properties, "avformat_producer", NULL );
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// Get the producer properties
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mlt_properties properties = MLT_PRODUCER_PROPERTIES( this );
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// Fetch the video_context
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AVFormatContext *context = mlt_properties_get_data( properties, "video_context", NULL );
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// Get the video_index
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int index = mlt_properties_get_int( properties, "video_index" );
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// Obtain the expected frame numer
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mlt_position expected = mlt_properties_get_position( properties, "_video_expected" );
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// Get the video stream
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AVStream *stream = context->streams[ index ];
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// Get codec context
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AVCodecContext *codec_context = stream->codec;
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// Packet
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AVPacket pkt;
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// Get the conversion frame
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AVFrame *av_frame = mlt_properties_get_data( properties, "av_frame", NULL );
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// Special case pause handling flag
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int paused = 0;
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// Special case ffwd handling
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int ignore = 0;
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// We may want to use the source fps if available
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double source_fps = mlt_properties_get_double( properties, "source_fps" );
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double fps = mlt_producer_get_fps( this );
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// This is the physical frame position in the source
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int req_position = ( int )( position / fps * source_fps + 0.5 );
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|
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// Get the seekable status
|
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int seekable = mlt_properties_get_int( properties, "seekable" );
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|
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// Generate the size in bytes
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|
int size = 0;
|
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|
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// Hopefully provide better support for streams...
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int av_bypass = mlt_properties_get_int( properties, "av_bypass" );
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|
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// Determines if we have to decode all frames in a sequence
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int must_decode = 1;
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|
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// Set the result arguments that we know here (only *buffer is now required)
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*width = codec_context->width;
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*height = codec_context->height;
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|
|
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switch ( *format )
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{
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case mlt_image_yuv420p:
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size = *width * 3 * ( *height + 1 ) / 2;
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break;
|
|
case mlt_image_rgb24:
|
|
size = *width * ( *height + 1 ) * 3;
|
|
break;
|
|
default:
|
|
*format = mlt_image_yuv422;
|
|
size = *width * ( *height + 1 ) * 2;
|
|
break;
|
|
}
|
|
|
|
// Set this on the frame properties
|
|
mlt_properties_set_int( frame_properties, "width", *width );
|
|
mlt_properties_set_int( frame_properties, "height", *height );
|
|
|
|
// Construct the output image
|
|
*buffer = mlt_pool_alloc( size );
|
|
|
|
// Temporary hack to improve intra frame only
|
|
must_decode = strcmp( codec_context->codec->name, "mjpeg" ) &&
|
|
strcmp( codec_context->codec->name, "rawvideo" ) &&
|
|
strcmp( codec_context->codec->name, "dvvideo" );
|
|
|
|
// Seek if necessary
|
|
if ( position != expected )
|
|
{
|
|
if ( av_frame != NULL && position + 1 == expected )
|
|
{
|
|
// We're paused - use last image
|
|
paused = 1;
|
|
}
|
|
else if ( !seekable && position > expected && ( position - expected ) < 250 )
|
|
{
|
|
// Fast forward - seeking is inefficient for small distances - just ignore following frames
|
|
ignore = ( int )( ( position - expected ) / fps * source_fps );
|
|
}
|
|
else if ( seekable && ( position < expected || position - expected >= 12 ) )
|
|
{
|
|
// Calculate the timestamp for the requested frame
|
|
int64_t timestamp = ( int64_t )( ( double )req_position / source_fps * AV_TIME_BASE + 0.5 );
|
|
if ( ( uint64_t )context->start_time != AV_NOPTS_VALUE )
|
|
timestamp += context->start_time;
|
|
if ( must_decode )
|
|
timestamp -= AV_TIME_BASE;
|
|
if ( timestamp < 0 )
|
|
timestamp = 0;
|
|
|
|
// Set to the timestamp
|
|
av_seek_frame( context, -1, timestamp, AVSEEK_FLAG_BACKWARD );
|
|
|
|
// Remove the cached info relating to the previous position
|
|
mlt_properties_set_int( properties, "_current_position", -1 );
|
|
mlt_properties_set_int( properties, "_last_position", -1 );
|
|
mlt_properties_set_data( properties, "av_frame", NULL, 0, NULL, NULL );
|
|
av_frame = NULL;
|
|
}
|
|
}
|
|
|
|
// Duplicate the last image if necessary (see comment on rawvideo below)
|
|
int current_position = mlt_properties_get_int( properties, "_current_position" );
|
|
int got_picture = mlt_properties_get_int( properties, "_got_picture" );
|
|
if ( av_frame != NULL && got_picture && ( paused || current_position >= req_position ) && av_bypass == 0 )
|
|
{
|
|
// Duplicate it
|
|
convert_image( av_frame, *buffer, codec_context->pix_fmt, *format, *width, *height );
|
|
|
|
// Set this on the frame properties
|
|
mlt_properties_set_data( frame_properties, "image", *buffer, size, ( mlt_destructor )mlt_pool_release, NULL );
|
|
}
|
|
else
|
|
{
|
|
int ret = 0;
|
|
int int_position = 0;
|
|
got_picture = 0;
|
|
|
|
av_init_packet( &pkt );
|
|
|
|
// Construct an AVFrame for YUV422 conversion
|
|
if ( av_frame == NULL )
|
|
{
|
|
av_frame = avcodec_alloc_frame( );
|
|
mlt_properties_set_data( properties, "av_frame", av_frame, 0, av_free, NULL );
|
|
}
|
|
|
|
while( ret >= 0 && !got_picture )
|
|
{
|
|
// Read a packet
|
|
ret = av_read_frame( context, &pkt );
|
|
|
|
// We only deal with video from the selected video_index
|
|
if ( ret >= 0 && pkt.stream_index == index && pkt.size > 0 )
|
|
{
|
|
// Determine time code of the packet
|
|
int_position = ( int )( av_q2d( stream->time_base ) * pkt.dts * source_fps + 0.5 );
|
|
if ( context->start_time != AV_NOPTS_VALUE )
|
|
int_position -= ( int )( context->start_time * source_fps / AV_TIME_BASE + 0.5 );
|
|
int last_position = mlt_properties_get_int( properties, "_last_position" );
|
|
if ( int_position == last_position )
|
|
int_position = last_position + 1;
|
|
mlt_properties_set_int( properties, "_last_position", int_position );
|
|
|
|
// Decode the image
|
|
if ( must_decode || int_position >= req_position )
|
|
ret = avcodec_decode_video( codec_context, av_frame, &got_picture, pkt.data, pkt.size );
|
|
|
|
if ( got_picture )
|
|
{
|
|
// Handle ignore
|
|
if ( int_position < req_position )
|
|
{
|
|
ignore = 0;
|
|
got_picture = 0;
|
|
}
|
|
else if ( int_position >= req_position )
|
|
{
|
|
ignore = 0;
|
|
}
|
|
else if ( ignore -- )
|
|
{
|
|
got_picture = 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
// Now handle the picture if we have one
|
|
if ( got_picture )
|
|
{
|
|
mlt_properties_set_int( frame_properties, "progressive", !av_frame->interlaced_frame );
|
|
mlt_properties_set_int( frame_properties, "top_field_first", av_frame->top_field_first );
|
|
convert_image( av_frame, *buffer, codec_context->pix_fmt, *format, *width, *height );
|
|
mlt_properties_set_data( frame_properties, "image", *buffer, size, (mlt_destructor)mlt_pool_release, NULL );
|
|
mlt_properties_set_int( properties, "_current_position", int_position );
|
|
mlt_properties_set_int( properties, "_got_picture", 1 );
|
|
}
|
|
|
|
// We're finished with this packet regardless
|
|
av_free_packet( &pkt );
|
|
}
|
|
}
|
|
|
|
// Very untidy - for rawvideo, the packet contains the frame, hence the free packet
|
|
// above will break the pause behaviour - so we wipe the frame now
|
|
if ( !strcmp( codec_context->codec->name, "rawvideo" ) )
|
|
mlt_properties_set_data( properties, "av_frame", NULL, 0, NULL, NULL );
|
|
|
|
// Set the field order property for this frame
|
|
mlt_properties_set_int( frame_properties, "top_field_first", mlt_properties_get_int( properties, "top_field_first" ) );
|
|
|
|
// Regardless of speed, we expect to get the next frame (cos we ain't too bright)
|
|
mlt_properties_set_position( properties, "_video_expected", position + 1 );
|
|
|
|
return 0;
|
|
}
|
|
|
|
/** Set up video handling.
|
|
*/
|
|
|
|
static void producer_set_up_video( mlt_producer this, mlt_frame frame )
|
|
{
|
|
// Get the properties
|
|
mlt_properties properties = MLT_PRODUCER_PROPERTIES( this );
|
|
|
|
// Fetch the video_context
|
|
AVFormatContext *context = mlt_properties_get_data( properties, "video_context", NULL );
|
|
|
|
// Get the video_index
|
|
int index = mlt_properties_get_int( properties, "video_index" );
|
|
|
|
// Get the frame properties
|
|
mlt_properties frame_properties = MLT_FRAME_PROPERTIES( frame );
|
|
|
|
if ( context != NULL && index != -1 )
|
|
{
|
|
// Get the video stream
|
|
AVStream *stream = context->streams[ index ];
|
|
|
|
// Get codec context
|
|
AVCodecContext *codec_context = stream->codec;
|
|
|
|
// Get the codec
|
|
AVCodec *codec = mlt_properties_get_data( properties, "video_codec", NULL );
|
|
|
|
// Initialise the codec if necessary
|
|
if ( codec == NULL )
|
|
{
|
|
// Find the codec
|
|
codec = avcodec_find_decoder( codec_context->codec_id );
|
|
|
|
// If we don't have a codec and we can't initialise it, we can't do much more...
|
|
if ( codec != NULL && avcodec_open( codec_context, codec ) >= 0 )
|
|
{
|
|
// Now store the codec with its destructor
|
|
mlt_properties_set_data( properties, "video_codec", codec_context, 0, producer_codec_close, NULL );
|
|
}
|
|
else
|
|
{
|
|
// Remember that we can't use this later
|
|
mlt_properties_set_int( properties, "video_index", -1 );
|
|
}
|
|
}
|
|
|
|
// No codec, no show...
|
|
if ( codec != NULL )
|
|
{
|
|
double source_fps = 0;
|
|
int norm_aspect_ratio = mlt_properties_get_int( properties, "norm_aspect_ratio" );
|
|
double force_aspect_ratio = mlt_properties_get_double( properties, "force_aspect_ratio" );
|
|
double aspect_ratio;
|
|
|
|
// XXX: We won't know the real aspect ratio until an image is decoded
|
|
// but we do need it now (to satisfy filter_resize) - take a guess based
|
|
// on pal/ntsc
|
|
if ( force_aspect_ratio > 0.0 )
|
|
{
|
|
aspect_ratio = force_aspect_ratio;
|
|
}
|
|
else if ( !norm_aspect_ratio && codec_context->sample_aspect_ratio.num > 0 )
|
|
{
|
|
aspect_ratio = av_q2d( codec_context->sample_aspect_ratio );
|
|
}
|
|
else
|
|
{
|
|
int is_pal = mlt_producer_get_fps( this ) == 25.0;
|
|
aspect_ratio = is_pal ? 59.0/54.0 : 10.0/11.0;
|
|
}
|
|
|
|
// Determine the fps
|
|
source_fps = ( double )codec_context->time_base.den / ( codec_context->time_base.num == 0 ? 1 : codec_context->time_base.num );
|
|
|
|
// We'll use fps if it's available
|
|
if ( source_fps > 0 )
|
|
mlt_properties_set_double( properties, "source_fps", source_fps );
|
|
else
|
|
mlt_properties_set_double( properties, "source_fps", mlt_producer_get_fps( this ) );
|
|
mlt_properties_set_double( properties, "aspect_ratio", aspect_ratio );
|
|
|
|
// Set the width and height
|
|
mlt_properties_set_int( frame_properties, "width", codec_context->width );
|
|
mlt_properties_set_int( frame_properties, "height", codec_context->height );
|
|
mlt_properties_set_double( frame_properties, "aspect_ratio", aspect_ratio );
|
|
|
|
mlt_frame_push_get_image( frame, producer_get_image );
|
|
mlt_properties_set_data( frame_properties, "avformat_producer", this, 0, NULL, NULL );
|
|
}
|
|
else
|
|
{
|
|
mlt_properties_set_int( frame_properties, "test_image", 1 );
|
|
}
|
|
}
|
|
else
|
|
{
|
|
mlt_properties_set_int( frame_properties, "test_image", 1 );
|
|
}
|
|
}
|
|
|
|
/** Get the audio from a frame.
|
|
*/
|
|
|
|
static int producer_get_audio( mlt_frame frame, int16_t **buffer, mlt_audio_format *format, int *frequency, int *channels, int *samples )
|
|
{
|
|
// Get the properties from the frame
|
|
mlt_properties frame_properties = MLT_FRAME_PROPERTIES( frame );
|
|
|
|
// Obtain the frame number of this frame
|
|
mlt_position position = mlt_properties_get_position( frame_properties, "avformat_position" );
|
|
|
|
// Get the producer
|
|
mlt_producer this = mlt_properties_get_data( frame_properties, "avformat_producer", NULL );
|
|
|
|
// Get the producer properties
|
|
mlt_properties properties = MLT_PRODUCER_PROPERTIES( this );
|
|
|
|
// Fetch the audio_context
|
|
AVFormatContext *context = mlt_properties_get_data( properties, "audio_context", NULL );
|
|
|
|
// Get the audio_index
|
|
int index = mlt_properties_get_int( properties, "audio_index" );
|
|
|
|
// Get the seekable status
|
|
int seekable = mlt_properties_get_int( properties, "seekable" );
|
|
|
|
// Obtain the expected frame numer
|
|
mlt_position expected = mlt_properties_get_position( properties, "_audio_expected" );
|
|
|
|
// Obtain the resample context if it exists (not always needed)
|
|
ReSampleContext *resample = mlt_properties_get_data( properties, "audio_resample", NULL );
|
|
|
|
// Obtain the audio buffer
|
|
int16_t *audio_buffer = mlt_properties_get_data( properties, "audio_buffer", NULL );
|
|
|
|
// Get amount of audio used
|
|
int audio_used = mlt_properties_get_int( properties, "_audio_used" );
|
|
|
|
// Calculate the real time code
|
|
double real_timecode = producer_time_of_frame( this, position );
|
|
|
|
// Get the audio stream
|
|
AVStream *stream = context->streams[ index ];
|
|
|
|
// Get codec context
|
|
AVCodecContext *codec_context = stream->codec;
|
|
|
|
// Packet
|
|
AVPacket pkt;
|
|
|
|
// Number of frames to ignore (for ffwd)
|
|
int ignore = 0;
|
|
|
|
// Flag for paused (silence)
|
|
int paused = 0;
|
|
|
|
// Check for resample and create if necessary
|
|
if ( resample == NULL && codec_context->channels <= 2 )
|
|
{
|
|
// Create the resampler
|
|
resample = audio_resample_init( *channels, codec_context->channels, *frequency, codec_context->sample_rate );
|
|
|
|
// And store it on properties
|
|
mlt_properties_set_data( properties, "audio_resample", resample, 0, ( mlt_destructor )audio_resample_close, NULL );
|
|
}
|
|
else if ( resample == NULL )
|
|
{
|
|
*channels = codec_context->channels;
|
|
*frequency = codec_context->sample_rate;
|
|
}
|
|
|
|
// Check for audio buffer and create if necessary
|
|
if ( audio_buffer == NULL )
|
|
{
|
|
// Allocate the audio buffer
|
|
audio_buffer = mlt_pool_alloc( /*AVCODEC_MAX_AUDIO_FRAME_SIZE*/ 192000 * sizeof( int16_t ) );
|
|
|
|
// And store it on properties for reuse
|
|
mlt_properties_set_data( properties, "audio_buffer", audio_buffer, 0, ( mlt_destructor )mlt_pool_release, NULL );
|
|
}
|
|
|
|
// Seek if necessary
|
|
if ( position != expected )
|
|
{
|
|
if ( position + 1 == expected )
|
|
{
|
|
// We're paused - silence required
|
|
paused = 1;
|
|
}
|
|
else if ( !seekable && position > expected && ( position - expected ) < 250 )
|
|
{
|
|
// Fast forward - seeking is inefficient for small distances - just ignore following frames
|
|
ignore = position - expected;
|
|
}
|
|
else if ( position < expected || position - expected >= 12 )
|
|
{
|
|
// Set to the real timecode
|
|
if ( av_seek_frame( context, -1, mlt_properties_get_double( properties, "_start_time" ) + real_timecode * 1000000.0, AVSEEK_FLAG_BACKWARD ) != 0 )
|
|
paused = 1;
|
|
|
|
// Clear the usage in the audio buffer
|
|
audio_used = 0;
|
|
}
|
|
}
|
|
|
|
// Get the audio if required
|
|
if ( !paused )
|
|
{
|
|
int ret = 0;
|
|
int got_audio = 0;
|
|
int16_t *temp = av_malloc( sizeof( int16_t ) * /*AVCODEC_MAX_AUDIO_FRAME_SIZE*/ 192000 );
|
|
|
|
av_init_packet( &pkt );
|
|
|
|
while( ret >= 0 && !got_audio )
|
|
{
|
|
// Check if the buffer already contains the samples required
|
|
if ( audio_used >= *samples && ignore == 0 )
|
|
{
|
|
got_audio = 1;
|
|
break;
|
|
}
|
|
|
|
// Read a packet
|
|
ret = av_read_frame( context, &pkt );
|
|
|
|
int len = pkt.size;
|
|
uint8_t *ptr = pkt.data;
|
|
|
|
// We only deal with audio from the selected audio_index
|
|
while ( ptr != NULL && ret >= 0 && pkt.stream_index == index && len > 0 )
|
|
{
|
|
int data_size = sizeof( int16_t ) * /*AVCODEC_MAX_AUDIO_FRAME_SIZE*/ 192000;
|
|
|
|
// Decode the audio
|
|
#if (LIBAVCODEC_VERSION_INT >= ((51<<16)+(29<<8)+0))
|
|
ret = avcodec_decode_audio2( codec_context, temp, &data_size, ptr, len );
|
|
#else
|
|
ret = avcodec_decode_audio( codec_context, temp, &data_size, ptr, len );
|
|
#endif
|
|
if ( ret < 0 )
|
|
{
|
|
ret = 0;
|
|
break;
|
|
}
|
|
|
|
len -= ret;
|
|
ptr += ret;
|
|
|
|
if ( data_size > 0 )
|
|
{
|
|
if ( resample != NULL )
|
|
{
|
|
audio_used += audio_resample( resample, &audio_buffer[ audio_used * *channels ], temp, data_size / ( codec_context->channels * sizeof( int16_t ) ) );
|
|
}
|
|
else
|
|
{
|
|
memcpy( &audio_buffer[ audio_used * *channels ], temp, data_size );
|
|
audio_used += data_size / ( codec_context->channels * sizeof( int16_t ) );
|
|
}
|
|
|
|
// Handle ignore
|
|
while ( ignore && audio_used > *samples )
|
|
{
|
|
ignore --;
|
|
audio_used -= *samples;
|
|
memmove( audio_buffer, &audio_buffer[ *samples * *channels ], audio_used * sizeof( int16_t ) );
|
|
}
|
|
}
|
|
|
|
// If we're behind, ignore this packet
|
|
float current_pts = av_q2d( stream->time_base ) * pkt.pts;
|
|
if ( seekable && ( !ignore && current_pts <= ( real_timecode - 0.02 ) ) )
|
|
ignore = 1;
|
|
}
|
|
|
|
// We're finished with this packet regardless
|
|
av_free_packet( &pkt );
|
|
}
|
|
|
|
*buffer = mlt_pool_alloc( *samples * *channels * sizeof( int16_t ) );
|
|
mlt_properties_set_data( frame_properties, "audio", *buffer, 0, ( mlt_destructor )mlt_pool_release, NULL );
|
|
|
|
// Now handle the audio if we have enough
|
|
if ( audio_used >= *samples )
|
|
{
|
|
memcpy( *buffer, audio_buffer, *samples * *channels * sizeof( int16_t ) );
|
|
audio_used -= *samples;
|
|
memmove( audio_buffer, &audio_buffer[ *samples * *channels ], audio_used * *channels * sizeof( int16_t ) );
|
|
}
|
|
else
|
|
{
|
|
memset( *buffer, 0, *samples * *channels * sizeof( int16_t ) );
|
|
}
|
|
|
|
// Store the number of audio samples still available
|
|
mlt_properties_set_int( properties, "_audio_used", audio_used );
|
|
|
|
// Release the temporary audio
|
|
av_free( temp );
|
|
}
|
|
else
|
|
{
|
|
// Get silence and don't touch the context
|
|
mlt_frame_get_audio( frame, buffer, format, frequency, channels, samples );
|
|
}
|
|
|
|
// Regardless of speed (other than paused), we expect to get the next frame
|
|
if ( !paused )
|
|
mlt_properties_set_position( properties, "_audio_expected", position + 1 );
|
|
|
|
return 0;
|
|
}
|
|
|
|
/** Set up audio handling.
|
|
*/
|
|
|
|
static void producer_set_up_audio( mlt_producer this, mlt_frame frame )
|
|
{
|
|
// Get the properties
|
|
mlt_properties properties = MLT_PRODUCER_PROPERTIES( this );
|
|
|
|
// Fetch the audio_context
|
|
AVFormatContext *context = mlt_properties_get_data( properties, "audio_context", NULL );
|
|
|
|
// Get the audio_index
|
|
int index = mlt_properties_get_int( properties, "audio_index" );
|
|
|
|
// Deal with audio context
|
|
if ( context != NULL && index != -1 )
|
|
{
|
|
// Get the frame properties
|
|
mlt_properties frame_properties = MLT_FRAME_PROPERTIES( frame );
|
|
|
|
// Get the audio stream
|
|
AVStream *stream = context->streams[ index ];
|
|
|
|
// Get codec context
|
|
AVCodecContext *codec_context = stream->codec;
|
|
|
|
// Get the codec
|
|
AVCodec *codec = mlt_properties_get_data( properties, "audio_codec", NULL );
|
|
|
|
// Initialise the codec if necessary
|
|
if ( codec == NULL )
|
|
{
|
|
// Find the codec
|
|
codec = avcodec_find_decoder( codec_context->codec_id );
|
|
|
|
// If we don't have a codec and we can't initialise it, we can't do much more...
|
|
if ( codec != NULL && avcodec_open( codec_context, codec ) >= 0 )
|
|
{
|
|
// Now store the codec with its destructor
|
|
mlt_properties_set_data( properties, "audio_codec", codec_context, 0, producer_codec_close, NULL );
|
|
|
|
}
|
|
else
|
|
{
|
|
// Remember that we can't use this later
|
|
mlt_properties_set_int( properties, "audio_index", -1 );
|
|
}
|
|
}
|
|
|
|
// No codec, no show...
|
|
if ( codec != NULL )
|
|
{
|
|
mlt_frame_push_audio( frame, producer_get_audio );
|
|
mlt_properties_set_data( frame_properties, "avformat_producer", this, 0, NULL, NULL );
|
|
mlt_properties_set_int( frame_properties, "frequency", codec_context->sample_rate );
|
|
mlt_properties_set_int( frame_properties, "channels", codec_context->channels );
|
|
}
|
|
}
|
|
}
|
|
|
|
/** Our get frame implementation.
|
|
*/
|
|
|
|
static int producer_get_frame( mlt_producer this, mlt_frame_ptr frame, int index )
|
|
{
|
|
// Create an empty frame
|
|
*frame = mlt_frame_init( );
|
|
|
|
// Update timecode on the frame we're creating
|
|
mlt_frame_set_position( *frame, mlt_producer_position( this ) );
|
|
|
|
// Set the position of this producer
|
|
mlt_properties_set_position( MLT_FRAME_PROPERTIES( *frame ), "avformat_position", mlt_producer_frame( this ) );
|
|
|
|
// Set up the video
|
|
producer_set_up_video( this, *frame );
|
|
|
|
// Set up the audio
|
|
producer_set_up_audio( this, *frame );
|
|
|
|
// Set the aspect_ratio
|
|
mlt_properties_set_double( MLT_FRAME_PROPERTIES( *frame ), "aspect_ratio", mlt_properties_get_double( MLT_PRODUCER_PROPERTIES( this ), "aspect_ratio" ) );
|
|
|
|
// Calculate the next timecode
|
|
mlt_producer_prepare_next( this );
|
|
|
|
return 0;
|
|
}
|