Scaling experimentation

[melted] / src / modules / dv / consumer_libdv.c

/*
 * producer_libdv.c -- a DV encoder based on libdv
 * Copyright (C) 2003-2004 Ushodaya Enterprises Limited
 * Author: Charles Yates <charles.yates@pandora.be>
 *
 * 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

// Local header files
#include "consumer_libdv.h"

// mlt Header files
#include <framework/mlt_frame.h>

// System header files
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <pthread.h>

// libdv header files
#include <libdv/dv.h>

// Forward references.
static int consumer_start( mlt_consumer this );
static int consumer_stop( mlt_consumer this );
static int consumer_is_stopped( mlt_consumer this );
static int consumer_encode_video( mlt_consumer this, uint8_t *dv_frame, mlt_frame frame );
static void consumer_encode_audio( mlt_consumer this, uint8_t *dv_frame, mlt_frame frame );
static void consumer_output( mlt_consumer this, uint8_t *dv_frame, int size, mlt_frame frame );
static void *consumer_thread( void *arg );
static void consumer_close( mlt_consumer this );

/** Initialise the dv consumer.
*/

mlt_consumer consumer_libdv_init( char *arg )
{
        // Allocate the consumer
        mlt_consumer this = calloc( 1, sizeof( struct mlt_consumer_s ) );

        // If memory allocated and initialises without error
        if ( this != NULL && mlt_consumer_init( this, NULL ) == 0 )
        {
                // Get properties from the consumer
                mlt_properties properties = mlt_consumer_properties( this );

                // Assign close callback
                this->close = consumer_close;

                // Interpret the argument
                if ( arg != NULL )
                        mlt_properties_set( properties, "target", arg );

                // Set the encode and output handling method
                mlt_properties_set_data( properties, "video", consumer_encode_video, 0, NULL, NULL );
                mlt_properties_set_data( properties, "audio", consumer_encode_audio, 0, NULL, NULL );
                mlt_properties_set_data( properties, "output", consumer_output, 0, NULL, NULL );

                // Set up start/stop/terminated callbacks
                this->start = consumer_start;
                this->stop = consumer_stop;
                this->is_stopped = consumer_is_stopped;
        }
        else
        {
                // Clean up in case of init failure
                free( this );
                this = NULL;
        }

        // Return this
        return this;
}

/** Start the consumer.
*/

static int consumer_start( mlt_consumer this )
{
        // Get the properties
        mlt_properties properties = mlt_consumer_properties( this );

        // Check that we're not already running
        if ( !mlt_properties_get_int( properties, "running" ) )
        {
                // Allocate a thread
                pthread_t *thread = calloc( 1, sizeof( pthread_t ) );

                // Assign the thread to properties
                mlt_properties_set_data( properties, "thread", thread, sizeof( pthread_t ), free, NULL );

                // Set the running state
                mlt_properties_set_int( properties, "running", 1 );

                // Create the thread
                pthread_create( thread, NULL, consumer_thread, this );
        }
        return 0;
}

/** Stop the consumer.
*/

static int consumer_stop( mlt_consumer this )
{
        // Get the properties
        mlt_properties properties = mlt_consumer_properties( this );

        // Check that we're running
        if ( mlt_properties_get_int( properties, "running" ) )
        {
                // Get the thread
                pthread_t *thread = mlt_properties_get_data( properties, "thread", NULL );

                // Stop the thread
                mlt_properties_set_int( properties, "running", 0 );

                // Wait for termination
                pthread_join( *thread, NULL );

                // Close the output file :-) - this is obtuse - doesn't matter if output file
                // exists or not - the destructor will kick in if it does
                mlt_properties_set_data( properties, "output_file", NULL, 0, NULL, NULL );
        }

        return 0;
}

/** Determine if the consumer is stopped.
*/

static int consumer_is_stopped( mlt_consumer this )
{
        // Get the properties
        mlt_properties properties = mlt_consumer_properties( this );
        return !mlt_properties_get_int( properties, "running" );
}

/** Get or create a new libdv encoder.
*/

static dv_encoder_t *libdv_get_encoder( mlt_consumer this, mlt_frame frame )
{
        // Get the properties of the consumer
        mlt_properties this_properties = mlt_consumer_properties( this );

        // Obtain the dv_encoder
        dv_encoder_t *encoder = mlt_properties_get_data( this_properties, "dv_encoder", NULL );

        // Construct one if we don't have one
        if ( encoder == NULL )
        {
                // Get the fps of the consumer (for now - should be from frame)
                double fps = mlt_properties_get_double( this_properties, "fps" );

                // Create the encoder
                encoder = dv_encoder_new( 0, 0, 0 );

                // Encoder settings
                encoder->isPAL = fps == 25;
                encoder->is16x9 = 0;
                encoder->vlc_encode_passes = 1;
                encoder->static_qno = 0;
                encoder->force_dct = DV_DCT_AUTO;

                // Store the encoder on the properties
                mlt_properties_set_data( this_properties, "dv_encoder", encoder, 0, ( mlt_destructor )dv_encoder_free, NULL );
        }

        // Return the encoder
        return encoder;
}


/** The libdv encode video method.
*/

static int consumer_encode_video( mlt_consumer this, uint8_t *dv_frame, mlt_frame frame )
{
        // Obtain the dv_encoder
        dv_encoder_t *encoder = libdv_get_encoder( this, frame );

        // Get the properties of the consumer
        mlt_properties this_properties = mlt_consumer_properties( this );

        // This will hold the size of the dv frame
        int size = 0;

        // If we get an encoder, then encode the image
        if ( encoder != NULL )
        {
                // Specify desired image properties
                mlt_image_format fmt = mlt_image_yuv422;
                int width = mlt_properties_get_int( this_properties, "width" );
                int height = mlt_properties_get_int( this_properties, "height" );
                uint8_t *image = NULL;

                // Get the image
                mlt_frame_get_image( frame, &image, &fmt, &width, &height, 0 );

                // Check that we get what we expected
                if ( fmt != mlt_image_yuv422 || 
                         width != mlt_properties_get_int( this_properties, "width" ) ||
                         height != mlt_properties_get_int( this_properties, "height" ) ||
                         image == NULL )
                {
                        // We should try to recover here
                        fprintf( stderr, "We have a problem houston...\n" );
                }
                else
                {
                        // Calculate the size of the dv frame
                        size = height == 576 ? frame_size_625_50 : frame_size_525_60;
                }

                // Process the frame
                if ( size != 0 )
                {
                        // Encode the image
                        dv_encode_full_frame( encoder, &image, e_dv_color_yuv, dv_frame );
                }
        }
        
        return size;
}

/** The libdv encode audio method.
*/

static void consumer_encode_audio( mlt_consumer this, uint8_t *dv_frame, mlt_frame frame )
{
        // Get the properties of the consumer
        mlt_properties this_properties = mlt_consumer_properties( this );

        // Get the properties of the frame
        mlt_properties frame_properties = mlt_frame_properties( frame );

        // Obtain the dv_encoder
        dv_encoder_t *encoder = libdv_get_encoder( this, frame );

        // Only continue if we have an encoder
        if ( encoder != NULL )
        {
                // Get the frame count
                int count = mlt_properties_get_int( this_properties, "count" );

                // Default audio args
                mlt_audio_format fmt = mlt_audio_pcm;
                int channels = 2;
                int frequency = 48000;
                int samples = mlt_sample_calculator( mlt_properties_get_double( this_properties, "fps" ), frequency, count );
                int16_t *pcm = NULL;

                // Get the frame number
                time_t start = time( NULL );
                int height = mlt_properties_get_int( this_properties, "height" );
                int is_pal = height == 576;
                int is_wide = mlt_properties_get_double( frame_properties, "fps" ) == ( ( double ) 16.0 / 9.0 );

                // Temporary - audio buffer allocation
                int16_t *audio_buffers[ 4 ];
                int i = 0;
                int j = 0;
                for ( i = 0 ; i < 4; i ++ )
                        audio_buffers[ i ] = calloc( 1, 2 * DV_AUDIO_MAX_SAMPLES );

                // Get the audio
                mlt_frame_get_audio( frame, &pcm, &fmt, &frequency, &channels, &samples );

                // Inform the encoder of the number of audio samples
                encoder->samples_this_frame = samples;

                // Fill the audio buffers correctly
                if ( mlt_properties_get_double( frame_properties, "_speed" ) == 1.0 )
                {
                        for ( i = 0; i < samples; i ++ )
                                for ( j = 0; j < channels; j++ )
                                        audio_buffers[ j ][ i ] = *pcm ++;
                }

                // Encode audio on frame
                dv_encode_full_audio( encoder, audio_buffers, channels, frequency, dv_frame );

                // Specify meta data on the frame
                dv_encode_metadata( dv_frame, is_pal, is_wide, &start, count );
                dv_encode_timecode( dv_frame, is_pal, count );

                // Update properties
                mlt_properties_set_int( this_properties, "count", ++ count );

                // Temporary - free audio buffers
                for ( i = 0 ; i < 4; i ++ )
                        free( audio_buffers[ i ] );
        }
}

/** The libdv output method.
*/

static void consumer_output( mlt_consumer this, uint8_t *dv_frame, int size, mlt_frame frame )
{
        // Get the properties
        mlt_properties properties = mlt_consumer_properties( this );

        FILE *output = stdout;
        char *target = mlt_properties_get( properties, "target" );

        if ( target != NULL )
        {
                output = mlt_properties_get_data( properties, "output_file", NULL );
                if ( output == NULL )
                {
                        output = fopen( target, "w" );
                        if ( output != NULL )
                                mlt_properties_set_data( properties, "output_file", output, 0, ( mlt_destructor )fclose, 0 );
                }
        }

        if ( output != NULL )
        {
                fwrite( dv_frame, size, 1, output );
                fflush( output );
        }
        else
        {
                fprintf( stderr, "Unable to open %s\n", target );
        }
}

/** The main thread - the argument is simply the consumer.
*/

static void *consumer_thread( void *arg )
{
        // Map the argument to the object
        mlt_consumer this = arg;

        // Get the properties
        mlt_properties properties = mlt_consumer_properties( this );

        // Get the handling methods
        int ( *video )( mlt_consumer, uint8_t *, mlt_frame ) = mlt_properties_get_data( properties, "video", NULL );
        int ( *audio )( mlt_consumer, uint8_t *, mlt_frame ) = mlt_properties_get_data( properties, "audio", NULL );
        int ( *output )( mlt_consumer, uint8_t *, int, mlt_frame ) = mlt_properties_get_data( properties, "output", NULL );

        // Allocate a single PAL frame for encoding
        uint8_t *dv_frame = malloc( frame_size_625_50 );

        // Loop while running
        while( mlt_properties_get_int( properties, "running" ) )
        {
                // Get the frame
                mlt_frame frame = mlt_consumer_get_frame( this );

                // Check that we have a frame to work with
                if ( frame != NULL )
                {
                        // Obtain the dv_encoder
                        if ( libdv_get_encoder( this, frame ) != NULL )
                        {
                                // Encode the image
                                int size = video( this, dv_frame, frame );

                                // Encode the audio
                                if ( size > 0 )
                                        audio( this, dv_frame, frame );

                                // Output the frame
                                output( this, dv_frame, size, frame );

                                // Close the frame
                                mlt_frame_close( frame );
                        }
                        else
                        {
                                fprintf( stderr, "Unable to obtain dv encoder.\n" );
                        }
                }
        }

        // Tidy up
        free( dv_frame );

        return NULL;
}

/** Close the consumer.
*/

static void consumer_close( mlt_consumer this )
{
        // Stop the consumer
        mlt_consumer_stop( this );

        // Close the parent
        mlt_consumer_close( this );

        // Free the memory
        free( this );
}