sdl hacks

[melted] / src / modules / sdl / consumer_sdl.c

/*
 * consumer_sdl.c -- A Simple DirectMedia Layer consumer
 * Copyright (C) 2003-2004 Ushodaya Enterprises Limited
 * Author: Dan Dennedy <dan@dennedy.org>
 *
 * 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.
 */

#include "consumer_sdl.h"
#include <framework/mlt_frame.h>
#include <framework/mlt_deque.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <pthread.h>
#include <SDL/SDL.h>
#include <SDL/SDL_syswm.h>
#include <sys/timeb.h>

/** This classes definition.
*/

typedef struct consumer_sdl_s *consumer_sdl;

struct consumer_sdl_s
{
        struct mlt_consumer_s parent;
        mlt_properties properties;
        mlt_deque queue;
        pthread_t thread;
        int running;
        uint8_t audio_buffer[ 4096 * 24 ];
        int audio_avail;
        pthread_mutex_t audio_mutex;
        pthread_cond_t audio_cond;
        int window_width;
        int window_height;
        float aspect_ratio;
        int width;
        int height;
        int playing;
        int sdl_flags;
        SDL_Surface *sdl_screen;
        SDL_Overlay *sdl_overlay;
        uint8_t *buffer;
};

/** Forward references to static functions.
*/

static int consumer_start( mlt_consumer parent );
static int consumer_stop( mlt_consumer parent );
static int consumer_is_stopped( mlt_consumer parent );
static void consumer_close( mlt_consumer parent );
static void *consumer_thread( void * );
static int consumer_get_dimensions( int *width, int *height );

/** This is what will be called by the factory - anything can be passed in
        via the argument, but keep it simple.
*/

mlt_consumer consumer_sdl_init( char *arg )
{
        // Create the consumer object
        consumer_sdl this = calloc( sizeof( struct consumer_sdl_s ), 1 );

        // If no malloc'd and consumer init ok
        if ( this != NULL && mlt_consumer_init( &this->parent, this ) == 0 )
        {
                // Create the queue
                this->queue = mlt_deque_init( );

                // Get the parent consumer object
                mlt_consumer parent = &this->parent;

                // We have stuff to clean up, so override the close method
                parent->close = consumer_close;

                // get a handle on properties
                mlt_service service = mlt_consumer_service( parent );
                this->properties = mlt_service_properties( service );

                // Set the default volume
                mlt_properties_set_double( this->properties, "volume", 1.0 );

                // This is the initialisation of the consumer
                pthread_mutex_init( &this->audio_mutex, NULL );
                pthread_cond_init( &this->audio_cond, NULL);
                
                // Default scaler (for now we'll use nearest)
                mlt_properties_set( this->properties, "rescale", "nearest" );

                // Default progressive true
                mlt_properties_set_int( this->properties, "progressive", 1 );

                // Get aspect ratio
                this->aspect_ratio = mlt_properties_get_double( this->properties, "aspect_ratio" );
                
                // process actual param
                if ( arg == NULL || sscanf( arg, "%dx%d", &this->width, &this->height ) != 2 )
                {
                        this->width = mlt_properties_get_int( this->properties, "width" );
                        this->height = mlt_properties_get_int( this->properties, "height" );
                }

                // Default window size
                this->window_width = (int)( (float)this->height * this->aspect_ratio ) + 1;
                this->window_height = this->height;
                
                // Set the sdl flags
                this->sdl_flags = SDL_HWSURFACE | SDL_ASYNCBLIT | SDL_HWACCEL | SDL_RESIZABLE;

                // Allow thread to be started/stopped
                parent->start = consumer_start;
                parent->stop = consumer_stop;
                parent->is_stopped = consumer_is_stopped;

                // Return the consumer produced
                return parent;
        }

        // malloc or consumer init failed
        free( this );

        // Indicate failure
        return NULL;
}

int consumer_start( mlt_consumer parent )
{
        consumer_sdl this = parent->child;

        if ( !this->running )
        {
                this->running = 1;
                pthread_create( &this->thread, NULL, consumer_thread, this );
        }

        return 0;
}

int consumer_stop( mlt_consumer parent )
{
        // Get the actual object
        consumer_sdl this = parent->child;

        if ( this->running )
        {
                // Kill the thread and clean up
                this->running = 0;

                pthread_mutex_lock( &this->audio_mutex );
                pthread_cond_broadcast( &this->audio_cond );
                pthread_mutex_unlock( &this->audio_mutex );

                pthread_join( this->thread, NULL );
        }

        return 0;
}

int consumer_is_stopped( mlt_consumer parent )
{
        consumer_sdl this = parent->child;
        return !this->running;
}

static int sdl_lock_display( )
{
        SDL_Surface *screen = SDL_GetVideoSurface( );
        return screen != NULL && ( !SDL_MUSTLOCK( screen ) || SDL_LockSurface( screen ) >= 0 );
}

static void sdl_unlock_display( )
{
        SDL_Surface *screen = SDL_GetVideoSurface( );
        if ( screen != NULL && SDL_MUSTLOCK( screen ) )
                SDL_UnlockSurface( screen );
}

static void sdl_fill_audio( void *udata, uint8_t *stream, int len )
{
        consumer_sdl this = udata;

        // Get the volume
        float volume = mlt_properties_get_double( this->properties, "volume" );

        pthread_mutex_lock( &this->audio_mutex );

        // Block until audio received
        while ( this->running && len > this->audio_avail )
                pthread_cond_wait( &this->audio_cond, &this->audio_mutex );

        if ( this->audio_avail >= len )
        {
                // Place in the audio buffer
                SDL_MixAudio( stream, this->audio_buffer, len, ( int )( ( float )SDL_MIX_MAXVOLUME * volume ) );

                // Remove len from the audio available
                this->audio_avail -= len;

                // Remove the samples
                memmove( this->audio_buffer, this->audio_buffer + len, this->audio_avail );
        }
        else
        {
                // Just to be safe, wipe the stream first
                memset( stream, 0, len );

                // Copy what we have into the stream
                memcpy( stream, this->audio_buffer, this->audio_avail );

                // Mix the audio 
                SDL_MixAudio( stream, stream, len, ( int )( ( float )SDL_MIX_MAXVOLUME * volume ) );

                // No audio left
                this->audio_avail = 0;
        }

        // We're definitely playing now
        this->playing = 1;

        pthread_cond_broadcast( &this->audio_cond );
        pthread_mutex_unlock( &this->audio_mutex );
}

static int consumer_play_audio( consumer_sdl this, mlt_frame frame, int init_audio, int *duration )
{
        // Get the properties of this consumer
        mlt_properties properties = this->properties;
        mlt_audio_format afmt = mlt_audio_pcm;

        // Set the preferred params of the test card signal
        int channels = 2;
        int frequency = 48000;
        static int counter = 0;
        if ( mlt_properties_get_int( properties, "frequency" ) != 0 )
                frequency =  mlt_properties_get_int( properties, "frequency" );

        int samples = mlt_sample_calculator( mlt_properties_get_double( this->properties, "fps" ), frequency, counter++ );
        
        int16_t *pcm;
        int bytes;

        mlt_frame_get_audio( frame, &pcm, &afmt, &frequency, &channels, &samples );
        *duration = ( ( samples * 1000 ) / frequency );

        if ( mlt_properties_get_int( properties, "audio_off" ) )
        {
                this->playing = 1;
                return init_audio;
        }

        if ( init_audio == 1 )
        {
                SDL_AudioSpec request;
                SDL_AudioSpec got;

                // specify audio format
                memset( &request, 0, sizeof( SDL_AudioSpec ) );
                this->playing = 0;
                request.freq = frequency;
                request.format = AUDIO_S16;
                request.channels = channels;
                request.samples = 2048;
                request.callback = sdl_fill_audio;
                request.userdata = (void *)this;
                if ( SDL_OpenAudio( &request, &got ) != 0 )
                {
                        fprintf( stderr, "SDL failed to open audio: %s\n", SDL_GetError() );
                        mlt_properties_set_int( properties, "audio_off", 1 );
                        init_audio = 2;
                }
                else if ( got.size != 0 )
                {
                        SDL_PauseAudio( 0 );
                        init_audio = 0;
                }
        }

        if ( init_audio == 0 )
        {
                bytes = ( samples * channels * 2 );
                pthread_mutex_lock( &this->audio_mutex );
                while ( bytes > ( sizeof( this->audio_buffer) - this->audio_avail ) )
                        pthread_cond_wait( &this->audio_cond, &this->audio_mutex );
                mlt_properties properties = mlt_frame_properties( frame );
                if ( mlt_properties_get_double( properties, "_speed" ) == 1 )
                        memcpy( &this->audio_buffer[ this->audio_avail ], pcm, bytes );
                else
                        memset( &this->audio_buffer[ this->audio_avail ], 0, bytes );
                this->audio_avail += bytes;
                pthread_cond_broadcast( &this->audio_cond );
                pthread_mutex_unlock( &this->audio_mutex );
        }
        else
        {
                this->playing = 1;
        }

        return init_audio;
}

static int consumer_play_video( consumer_sdl this, mlt_frame frame, int64_t elapsed, int64_t playtime )
{
        int error = 0;
        // Get the properties of this consumer
        mlt_properties properties = this->properties;

        mlt_image_format vfmt = mlt_image_yuv422;
        int width = this->width, height = this->height;
        uint8_t *image;
        int changed = 0;
        struct timeb now;
        ftime( &now );
        int64_t start = ( ( int64_t )now.time * 1000 + now.millitm );

        if ( mlt_properties_get_int( properties, "video_off" ) )
        {
                mlt_frame_close( frame );
                return 0;
        }

        if ( frame != NULL )
        {
                // Set playtime
                mlt_properties_set_position( mlt_frame_properties( frame ), "playtime", playtime );
                mlt_properties_set_double( mlt_frame_properties( frame ), "consumer_scale", ( double )height / mlt_properties_get_double( properties, "height" ) );

                // Push this frame to the back of the queue
                mlt_deque_push_back( this->queue, frame );
        }

        if ( this->playing )
        {
                // We might want to use an old frame if the current frame is skipped
                mlt_frame candidate = NULL;
                frame = NULL;

                while ( frame == NULL && mlt_deque_count( this->queue ) )
                {
                        frame = mlt_deque_peek_front( this->queue );
                        playtime = mlt_properties_get_position( mlt_frame_properties( frame ), "playtime" );

                        // Check if frame is in the future or past
                        if ( playtime > elapsed + 500 )
                        {
                                // Too far in the future - play it now
                                frame = mlt_deque_pop_front( this->queue );
                        }
                        else if ( playtime > elapsed + 160 )
                        {
                                // Time to squeeze a few more frames in
                                frame = candidate;
                                candidate = NULL;
                                error = 1;
                                break;
                        }
                        else if ( playtime < elapsed )
                        {
                                if ( candidate != NULL )
                                        mlt_frame_close( candidate );
                                candidate = mlt_deque_pop_front( this->queue );
                                frame = NULL;
                        }
                        else
                        {
                                // Get the frame at the front of the queue
                                frame = mlt_deque_pop_front( this->queue );
                        }
                }

                if ( frame == NULL )
                        frame = candidate;
                else if ( candidate != NULL )
                        mlt_frame_close( candidate );
        }
        else
        {
                if ( frame != NULL )
                        mlt_frame_get_image( frame, &image, &vfmt, &width, &height, 0 );
                frame = NULL;
        }

        if ( this->playing && frame != NULL )
        {
                // Get the image, width and height
                mlt_frame_get_image( frame, &image, &vfmt, &width, &height, 0 );
                ftime( &now );
                elapsed += ( ( int64_t )now.time * 1000 + now.millitm ) - start;

                playtime = mlt_properties_get_position( mlt_frame_properties( frame ), "playtime" );
                struct timespec slow = { 0, ( playtime - elapsed ) * 1000 };
                if ( slow.tv_nsec > 50 )
                        nanosleep( &slow, NULL );

                // Handle events
                if ( this->sdl_screen != NULL )
                {
                        SDL_Event event;
        
                        changed = consumer_get_dimensions( &this->window_width, &this->window_height );
        
                        while ( SDL_PollEvent( &event ) )
                        {
                                switch( event.type )
                                {
                                        case SDL_VIDEORESIZE:
                                                this->window_width = event.resize.w;
                                                this->window_height = event.resize.h;
                                                changed = 1;
                                                break;
                                        case SDL_KEYDOWN:
                                                {
                                                        mlt_producer producer = mlt_properties_get_data( properties, "transport_producer", NULL );
                                                        char keyboard[ 2 ] = " ";
                                                        void (*callback)( mlt_producer, char * ) = mlt_properties_get_data( properties, "transport_callback", NULL );
                                                        if ( callback != NULL && producer != NULL && event.key.keysym.unicode < 0x80 && event.key.keysym.unicode > 0 )
                                                        {
                                                                keyboard[ 0 ] = ( char )event.key.keysym.unicode;
                                                                callback( producer, keyboard );
                                                        }
                                                }
                                                break;
                                }
                        }
                }
        
                if ( width != this->width || height != this->height )
                {
                        this->width = width;
                        this->height = height;
                        changed = 1;
                }

                if ( this->sdl_screen == NULL || changed )
                {
                        double aspect_ratio = mlt_frame_get_aspect_ratio( frame );
                        float display_aspect_ratio = (float)width / (float)height;
                        SDL_Rect rect;

                        if ( mlt_properties_get_double( properties, "aspect_ratio" ) )
                                aspect_ratio = mlt_properties_get_double( properties, "aspect_ratio" );

                        if ( aspect_ratio == 1 )
                        {
                                rect.w = this->window_width;
                                rect.h = this->window_height;
                        }
                        else if ( this->window_width < this->window_height * aspect_ratio )
                        {
                                rect.w = this->window_width;
                                rect.h = this->window_width / aspect_ratio;
                        }
                        else
                        {
                                rect.w = this->window_height * aspect_ratio;
                                rect.h = this->window_height;
                        }

                        if ( mlt_properties_get_int( properties, "scale_overlay" ) )
                        {
                                if ( ( float )rect.w * display_aspect_ratio < this->window_width )
                                        rect.w = ( int )( ( float )rect.w * display_aspect_ratio );
                                else if ( ( float )rect.h * display_aspect_ratio < this->window_height )
                                        rect.h = ( int )( ( float )rect.h * display_aspect_ratio );
                        }

                        rect.x = ( this->window_width - rect.w ) / 2;
                        rect.y = ( this->window_height - rect.h ) / 2;

                        // Force an overlay recreation
                        if ( this->sdl_overlay != NULL )
                                SDL_FreeYUVOverlay( this->sdl_overlay );

                        // open SDL window with video overlay, if possible
                        this->sdl_screen = SDL_SetVideoMode( this->window_width, this->window_height, 0, this->sdl_flags );

                        if ( this->sdl_screen != NULL )
                        {
                                SDL_SetClipRect( this->sdl_screen, &rect );
                        
                                sdl_lock_display();
                                this->sdl_overlay = SDL_CreateYUVOverlay( this->width - (this->width % 4), this->height- (this->height % 2 ), SDL_YUY2_OVERLAY, this->sdl_screen );
                                sdl_unlock_display();
                        }
                }
                        
                if ( this->sdl_screen != NULL && this->sdl_overlay != NULL )
                {
                        this->buffer = this->sdl_overlay->pixels[ 0 ];
                        if ( SDL_LockYUVOverlay( this->sdl_overlay ) >= 0 )
                        {
                                memcpy( this->buffer, image, width * height * 2 );
                                SDL_UnlockYUVOverlay( this->sdl_overlay );
                                SDL_DisplayYUVOverlay( this->sdl_overlay, &this->sdl_screen->clip_rect );
                        }
                }
        }

        // Close the frame
        if ( frame != NULL )
                mlt_frame_close( frame );

        return error;
}

/** Threaded wrapper for pipe.
*/

static void *consumer_thread( void *arg )
{
        // Identify the arg
        consumer_sdl this = arg;

        // Get the consumer
        mlt_consumer consumer = &this->parent;

        // internal intialization
        int init_audio = 1;

        // Obtain time of thread start
        struct timeb now;
        int64_t start = 0;
        int64_t elapsed = 0;
        int duration = 0;
        int64_t playtime = 0;

        // Initialise the SDL subsystem
        if ( SDL_Init( SDL_INIT_VIDEO | SDL_INIT_AUDIO | SDL_INIT_NOPARACHUTE ) < 0 )
        {
                fprintf( stderr, "Failed to initialize SDL: %s\n", SDL_GetError() );
                return NULL;
        }

        // Additional initialisation
        SDL_EnableKeyRepeat( SDL_DEFAULT_REPEAT_DELAY, SDL_DEFAULT_REPEAT_INTERVAL );
        SDL_EnableUNICODE( 1 );

        // Loop until told not to
        while( this->running )
        {
                // Get a frame from the attached producer
                mlt_frame frame = mlt_consumer_get_frame( consumer );
                mlt_frame video_frame = frame;
                int done = 0;

                // Ensure that we have a frame
                while ( !done )
                {
                        // Play audio
                        if ( sizeof( this->audio_buffer ) - this->audio_avail > 8192 || mlt_deque_count( this->queue ) == 1 )
                        {
                                init_audio = consumer_play_audio( this, frame, init_audio, &duration );
                                done = 1;
                        }

                        if ( this->playing )
                        {
                                // Get the current time
                                ftime( &now );

                                // Determine elapsed time
                                if ( start == 0 )
                                        start = ( int64_t )now.time * 1000 + now.millitm;
                                else
                                        elapsed = ( ( int64_t )now.time * 1000 + now.millitm ) - start;
                        }

                        if ( consumer_play_video( this, video_frame, elapsed, playtime ) )
                        {
                                if ( !done )
                                {
                                        init_audio = consumer_play_audio( this, frame, init_audio, &duration );
                                        done = 1;
                                }
                        }

                        if ( video_frame != NULL )
                        {
                                video_frame = NULL;
                                playtime += duration;
                        }
                }
        }

        // internal cleanup
        if ( init_audio == 0 )
                SDL_AudioQuit( );
        if ( this->sdl_overlay != NULL )
                SDL_FreeYUVOverlay( this->sdl_overlay );
        SDL_Quit( );

        while( mlt_deque_count( this->queue ) )
                mlt_frame_close( mlt_deque_pop_back( this->queue ) );

        this->sdl_screen = NULL;
        this->sdl_overlay = NULL;
        this->audio_avail = 0;

        return NULL;
}

static int consumer_get_dimensions( int *width, int *height )
{
        int changed = 0;

        // SDL windows manager structure
        SDL_SysWMinfo wm;

        // Specify the SDL Version
        SDL_VERSION( &wm.version );

        // Get the wm structure
        if ( SDL_GetWMInfo( &wm ) == 1 )
        {
                // Check that we have the X11 wm
                if ( wm.subsystem == SDL_SYSWM_X11 ) 
                {
                        // Get the SDL window
                        Window window = wm.info.x11.window;

                        // Get the display session
                        Display *display = wm.info.x11.display;

                        // Get the window attributes
                        XWindowAttributes attr;
                        XGetWindowAttributes( display, window, &attr );

                        // Determine whether window has changed
                        changed = *width != attr.width || *height != attr.height;

                        // Return width and height
                        *width = attr.width;
                        *height = attr.height;
                }
        }

        return changed;
}

/** Callback to allow override of the close method.
*/

static void consumer_close( mlt_consumer parent )
{
        // Get the actual object
        consumer_sdl this = parent->child;

        // Stop the consumer
        mlt_consumer_stop( parent );

        // Destroy mutexes
        pthread_mutex_destroy( &this->audio_mutex );
        pthread_cond_destroy( &this->audio_cond );
                
        // Now clean up the rest
        mlt_consumer_close( parent );

        // Finally clean up this
        free( this );
}