source: soft/giet_vm/applications/mjpeg/mjpeg.c @ 741

/////////////////////////////////////////////////////////////////////////////////////////
// File   : mjpeg.c   
// Date   : octobre 2015
// author : Alain Greiner
/////////////////////////////////////////////////////////////////////////////////////////
// This multi-threaded application illustrates "pipe-line" parallelism, and message
// passing programming model, on top of the POSIX threads API.
// It makes the parallel decompression of a MJPEG bitstream contained in a file.
// The application is described as a TCG (Task and Communication Graph), and all
// communications between threads uses MWMR channels,.
// It uses the chained buffer DMA component to display the images on the graphic display.
// It contains 5 types of threads, plus the "main" thread, that makes initialisation,
// dispatch the byte stream to the various pipelines, and makes instrumentation.
// and 7 types of MWMR communication channels:
// - the main thread is only mapped in cluster[0,0], but all other threads
//   (DEMUX, VLD, IQZZ, IDCT, LIBU) are replicated in all clusters.
// - all MWMR channels are replicated in all clusters.
// The number of cluster cannot be larger than 16*16.
// The number of processors per cluster is not constrained.
// The frame buffer size must fit the decompressed images size.
// It uses one TTY terminal shared by all tasks.
/////////////////////////////////////////////////////////////////////////////////////////

#include <stdio.h>
#include <mwmr_channel.h>
#include <malloc.h>
#include <stdlib.h>
#include "mjpeg.h"
#include <mapping_info.h>     // for coprocessor types and modes


// macro to use a shared TTY
#define PRINTF(...)    lock_acquire( &tty_lock ); \
                       giet_tty_printf(__VA_ARGS__);  \
                       lock_release( &tty_lock );

///////////////////////////////////////////////
//       Global variables
///////////////////////////////////////////////

uint32_t         fd;    // file descriptor for the file containing the MJPEG stream

// arrays of pointers on MWMR channels
mwmr_channel_t*  main_2_demux[256];       // one per cluster
mwmr_channel_t*  demux_2_vld_data[256];   // one per cluster
mwmr_channel_t*  demux_2_vld_huff[256];   // one per cluster
mwmr_channel_t*  demux_2_iqzz[256];       // one per cluster
mwmr_channel_t*  vld_2_iqzz[256];         // one per cluster
mwmr_channel_t*  iqzz_2_idct[256];        // one per cluster
mwmr_channel_t*  idct_2_libu[256];        // one per cluster

// thread trdid ( for pthread_create() and pthread_join() )
pthread_t   trdid_demux[256];             // one per cluster
pthread_t   trdid_vld[256];               // one per cluster
pthread_t   trdid_iqzz[256];              // one per cluster 
pthread_t   trdid_idct[256];              // one per cluster 
pthread_t   trdid_libu[256];              // one per cluster 

user_lock_t      tty_lock;                // lock protecting shared TTY

uint8_t*         cma_buf[256];            // CMA buffers (one per cluster)
void*            cma_sts[256];            // CMA buffers status

uint32_t         fbf_width;               // Frame Buffer width
uint32_t         fbf_height;              // Frame Buffer height

uint32_t         nblocks_h;               // number of blocks in a column
uint32_t         nblocks_w;               // number of blocks in a row   

uint32_t         date[MAX_IMAGES];        // date of libu completion

////////////////////////////////////////////////
// declare thread functions
////////////////////////////////////////////////

extern void demux( uint32_t index );
extern void vld( uint32_t index );
extern void iqzz( uint32_t index );
extern void idct( uint32_t index );
extern void libu( uint32_t index );

/////////////////////////////////////////
__attribute__ ((constructor)) void main()
/////////////////////////////////////////
{
    // get platform parameters
    uint32_t  x_size;
    uint32_t  y_size;
    uint32_t  nprocs;
    giet_procs_number( &x_size , &y_size , &nprocs );

    // shared TTY allocation
    giet_tty_alloc( 1 );
    lock_init( &tty_lock );

    // check platform parameters
    giet_pthread_assert( (nprocs <= 6),
                         "[MJPEG ERROR] nprocs cannot be larger than 4");

    giet_pthread_assert( (x_size <= 16),
                         "[MJPEG ERROR] x_size cannot be larger than 16");

    giet_pthread_assert( (y_size <= 16),
                         "[MJPEG ERROR] y_size cannot be larger than 16");

    giet_pthread_assert( (MAX_IMAGES >= (x_size*y_size)),
                         "MJPEG ERROR] number of images smaller than x_size * y_size");

    // check frame buffer size
    giet_fbf_size( &fbf_width , &fbf_height );

    giet_pthread_assert( ((fbf_width & 0x7) == 0) && ((fbf_height & 0x7) == 0) ,
                         "[MJPEG ERROR] image width and height must be multiple of 8");

    // request frame buffer and CMA channel allocation 
    giet_fbf_alloc();
    giet_fbf_cma_alloc( x_size * y_size );

    // file name and image size acquisition
    char          file_pathname[256];
    uint32_t      image_width;
    uint32_t      image_height;
    uint32_t      fd;                   // file descriptor

    if ( INTERACTIVE_MODE )
    {
        PRINTF("\n[MJPEG] enter path for JPEG stream file (default is plan_48.mjpg)\n> ") 
        giet_tty_gets( file_pathname , 256 );

        if ( file_pathname[0] == 0 )
        {
            strcpy( file_pathname , "/misc/plan_48.mjpg" );
            image_width  = 48;
            image_height = 48;
        }
        else
        {
            PRINTF("\n[MJPEG] enter image width\n> ")  
            giet_tty_getw( &image_width );
            PRINTF("\n[MJPEG] enter image height\n> ")  
            giet_tty_getw( &image_height );
            PRINTF("\n") 
        }
    }
    else
    {
        strcpy( file_pathname , "/misc/plan_48.mjpg" );
        image_width  = 48;
        image_height = 48;
    }
    
    giet_pthread_assert( (image_width == fbf_width) && (image_height == fbf_height) ,
                         "[MJPEG ERROR] image size doesn't fit frame buffer size");
 
    if ( USE_DCT_COPROC )
    { PRINTF("\n\n[MJPEG] stream %s / %d clusters / %d cores / DCT COPROC\n\n",
           file_pathname , x_size*y_size , nprocs ) }
    else
    { PRINTF("\n\n[MJPEG] stream %s / %d clusters / %d cores / NO DCT COPROC\n\n",
           file_pathname , x_size*y_size , nprocs ) }

    // compute nblocks_h & nblocks_w
    nblocks_w = fbf_width / 8;
    nblocks_h = fbf_height / 8;

    // open file containing the MJPEG bit stream
    fd = giet_fat_open( file_pathname , 0 );

    giet_pthread_assert( (fd >= 0),
                         "[MJPEG ERROR] cannot open MJPEG stream file");

    // index for loops
    uint32_t x;
    uint32_t y;
    uint32_t n;

    uint32_t*  buffer;  

    // initialise distributed heap, 
    // allocate MWMR channels
    // allocate buffers for CMA
    for ( x = 0 ; x < x_size ; x++ ) 
    {
        for ( y = 0 ; y < y_size ; y++ ) 
        {
            uint32_t index = x*y_size + y;

            // initialise heap[x][y]
            heap_init( x , y );

            // allocate MWMR channels in cluster[x][y] 
            main_2_demux[index]     = remote_malloc( sizeof( mwmr_channel_t ) , x , y );
            buffer                  = remote_malloc( 4 * MAIN_2_DEMUX_DEPTH , x , y );
            mwmr_init( main_2_demux[index] , buffer , 1 , MAIN_2_DEMUX_DEPTH );

            demux_2_vld_data[index] = remote_malloc( sizeof( mwmr_channel_t ) , x , y );
            buffer                  = remote_malloc( 4 * DEMUX_2_VLD_DATA_DEPTH , x , y );
            mwmr_init( demux_2_vld_data[index] , buffer , 1 , DEMUX_2_VLD_DATA_DEPTH );

            demux_2_vld_huff[index] = remote_malloc( sizeof( mwmr_channel_t ) , x , y );
            buffer                  = remote_malloc( 4 * DEMUX_2_VLD_HUFF_DEPTH , x , y );
            mwmr_init( demux_2_vld_huff[index] , buffer , 1 , DEMUX_2_VLD_HUFF_DEPTH );

            demux_2_iqzz[index]     = remote_malloc( sizeof( mwmr_channel_t ) , x , y );
            buffer                  = remote_malloc( 4 * DEMUX_2_IQZZ_DEPTH , x , y );
            mwmr_init( demux_2_iqzz[index] , buffer , 1 , DEMUX_2_IQZZ_DEPTH );

            vld_2_iqzz[index]       = remote_malloc( sizeof( mwmr_channel_t ) , x , y );
            buffer                  = remote_malloc( 4 * VLD_2_IQZZ_DEPTH , x , y );
            mwmr_init( vld_2_iqzz[index] , buffer , 1 , VLD_2_IQZZ_DEPTH );

            iqzz_2_idct[index]      = remote_malloc( sizeof( mwmr_channel_t ) , x , y );
            buffer                  = remote_malloc( 4 * IQZZ_2_IDCT_DEPTH , x , y );
            mwmr_init( iqzz_2_idct[index] , buffer , 1 , IQZZ_2_IDCT_DEPTH );

            idct_2_libu[index]      = remote_malloc( sizeof( mwmr_channel_t ) , x , y );
            buffer                  = remote_malloc( 4 * IDCT_2_LIBU_DEPTH , x , y );
            mwmr_init( idct_2_libu[index] , buffer , 1 , IDCT_2_LIBU_DEPTH );

            // allocate and register CMA buffers in cluster[x][y]
            cma_buf[index] = remote_malloc( fbf_width * fbf_height , x , y );
            cma_sts[index] = remote_malloc( 64 , x , y );
            giet_fbf_cma_init_buf( index , cma_buf[index] , cma_sts[index] );
        }
    }

    // start CMA channel
    giet_fbf_cma_start();

    mwmr_channel_t* pc;

    for ( n = 0 ; n < x_size*y_size ; n++ )
    {
        pc = main_2_demux[n];
        PRINTF(" - main_2_demux[%d]  = %x / &lock = %x / &buf = %x / size = %d\n",
               n, pc, (uint32_t)&pc->lock, (uint32_t)pc->data, pc->depth<<2 ) 

        pc = demux_2_vld_data[n];
        PRINTF(" - demux_2_vld[%d] = %x / &lock = %x / &buf = %x / size = %d\n",
               n, pc, (uint32_t)&pc->lock, (uint32_t)pc->data, pc->depth<<2 ) 

        pc = vld_2_iqzz[n];
        PRINTF(" - vld_2_iqzz[%d]  = %x / &lock = %x / &buf = %x / size = %d\n",
               n, pc, (uint32_t)&pc->lock, (uint32_t)pc->data, pc->depth<<2 ) 

        pc = iqzz_2_idct[n];
        PRINTF(" - iqzz_2_idct[%d] = %x / &lock = %x / &buf = %x / size = %d\n",
               n, pc, (uint32_t)&pc->lock, (uint32_t)pc->data, pc->depth<<2 ) 

        pc = idct_2_libu[n];
        PRINTF(" - idct_2_libu[%d] = %x / &lock = %x / &buf = %x / size = %d\n",
               n, pc, (uint32_t)&pc->lock, (uint32_t)pc->data, pc->depth<<2 ) 
    }

    // launch all threads : precise mapping is defined in the mjpeg.py file
    uint32_t index;

    for ( x = 0 ; x < x_size ; x++ )
    {
        for ( y = 0 ; y < y_size ; y++ )
        {
            index = x * y_size + y;

            // DEMUX  
            if ( giet_pthread_create( &trdid_demux[index], NULL, &demux , (void*)index ) )
            giet_pthread_exit( "error launching thread demux\n");

            // VLD
            if ( giet_pthread_create( &trdid_vld[index], NULL, &vld , (void*)index ) )
            giet_pthread_exit( "error launching thread vld\n");

            // IQZZ
            if ( giet_pthread_create( &trdid_iqzz[index], NULL, &iqzz , (void*)index ) )
            giet_pthread_exit( "error launching thread iqzz");

            // IDCT
            if ( USE_DCT_COPROC )  // allocate, initialise, and start hardware coprocessor
            {
                giet_coproc_channel_t in_channel;
                giet_coproc_channel_t out_channel;
                uint32_t  cluster_xy  = (x<<4) + y;
                uint32_t  coproc_type = 2;
                uint32_t  info;

                // allocate DCT coprocessor
                giet_coproc_alloc( cluster_xy , coproc_type , &info );

                // initialize channels
                in_channel.channel_mode = MODE_MWMR;
                in_channel.buffer_size  = (iqzz_2_idct[index]->depth)<<2;
                in_channel.buffer_vaddr = (uint32_t)(iqzz_2_idct[index]->data);
                in_channel.status_vaddr = (uint32_t)(&iqzz_2_idct[index]->sts);
                in_channel.lock_vaddr   = (uint32_t)(&iqzz_2_idct[index]->lock);
    
                giet_coproc_channel_init( cluster_xy , coproc_type , 0 , &in_channel );

                out_channel.channel_mode = MODE_MWMR;
                out_channel.buffer_size  = (idct_2_libu[index]->depth)<<2;
                out_channel.buffer_vaddr = (uint32_t)(idct_2_libu[index]->data);
                out_channel.status_vaddr = (uint32_t)(&idct_2_libu[index]->sts);
                out_channel.lock_vaddr   = (uint32_t)(&idct_2_libu[index]->lock);

                giet_coproc_channel_init( cluster_xy , coproc_type , 1 , &out_channel );

                // start coprocessor
                giet_coproc_run( cluster_xy , coproc_type );
            }
            else                   // launches a software thread
            {
                if ( giet_pthread_create( &trdid_idct[index], NULL, &idct , (void*)index ) )
                giet_pthread_exit( "error launching thread idct\n");
            }

            // LIBU
            if ( giet_pthread_create( &trdid_libu[index], NULL, &libu , (void*)index ) )
            giet_pthread_exit( "error launching thread libu\n");
        }
    }

    /////////////////////////////////////////////////////////////////////////////////////
    // dispatch the byte stream to the demux threads, one compressed image per cluster.
    // It transfer the stream from the file identified by the fd argument to a 1024 
    // bytes local buffer. It analyses the stream to detect the End_of_Image markers.
    // All the bytes corresponding to a single image from the first byte, to the EOI 
    // marker included, are written in the main_2_demux[index] channel, in increasing 
    // order of the cluster index.
    /////////////////////////////////////////////////////////////////////////////////////

    // allocate input buffer : 1024 bytes
    uint8_t        bufin[1024];

    // allocate output bufio to access output MWMR channels : 64 bytes == 16 words
    mwmr_bufio_t  bufio;
    uint8_t       bufout[64]; 
    mwmr_bufio_init( &bufio , bufout , 64 , 0 , main_2_demux[0] );

    uint32_t  image;           // image index
    uint32_t  cluster;         // cluster index / modulo x_size*y_size
    uint32_t  ptr;             // byte pointer in input buffer
    uint32_t  eoi_found;       // boolean : End-of-Image found
    uint32_t  ff_found;        // boolean : 0xFF value found
    uint32_t  bytes_count;     // mumber of bytes in compressed image
       
    // initialise image and cluster index, and bufin pointer
    image   = 0;
    cluster = 0;
    ptr     = 0;

    while( image < MAX_IMAGES )  // one compressed image per iteration
    {
        // initialise image specific variables
        eoi_found   = 0;
        ff_found    = 0;
        bytes_count = 0; 
       
        // re-initialise the destination buffer for each image
        bufio.mwmr = main_2_demux[cluster];

        // scan bit stream until EOI found
        // transfer one byte per iteration from input buffer to output bufio
        while ( eoi_found == 0 )
        {
            // - tranfer 1024 bytes from file to input buffer when input buffer empty.
            // - return to first byte in input file when EOF found, 
            //   to emulate an infinite stream of images.
            if ( ptr == 0 )
            {
                uint32_t r = giet_fat_read( fd , bufin , 1024 );
                if ( r < 1024 ) 
                {
                    giet_fat_lseek( fd , 0 , SEEK_SET );
                    giet_fat_read( fd , bufin + r , 1024 - r );
                }
            }

            // transfer one byte from input buffer to output bufio
            mwmr_bufio_write_byte( &bufio , bufin[ptr] );

            // analyse this byte to find EOI marker OxFFD8
            // flush the output buffer when EOI found
            if ( ff_found )  // possible End of Image
            { 
                ff_found = 0;
                if ( bufin[ptr] == 0xD9 )   // End of Image found
                {
                    // exit current image
                    eoi_found = 1;

                    // flush output bufio
                    mwmr_bufio_flush( &bufio );
                }
            }
            else           // test if first byte of a marker
            {
                if ( bufin[ptr] == 0xFF )  ff_found = 1;
            }        

            // increment input buffer pointer modulo 1024
            ptr++;
            if ( ptr == 1024 ) ptr = 0;
                
            // increment bytes_count for current image
            bytes_count++;

        } // end while (eoi)
 
#if DEBUG_MAIN
PRINTF("\nMAIN send image %d to cluster %d at cycle %d : %d bytes\n",
       image , cluster , giet_proctime() , bytes_count )
#endif
        // increment image index
        image++;

        // increment cluster index modulo (x_size*y_size)   
        cluster++; 
        if (cluster == x_size * y_size) cluster = 0;    

    } // end while on images

    /////////////////////////////////////////////////////////////////////////////////////
    // wait all threads completion
    /////////////////////////////////////////////////////////////////////////////////////

    for ( x = 0 ; x < x_size ; x++ )
    {
        for ( y = 0 ; y < y_size ; y++ )
        {
            index = x * y_size + y;

            if ( giet_pthread_join( trdid_demux[index] , NULL ) )
            { PRINTF("\n[MJPEG ERROR] calling giet_pthread_join() for demux[%d]\n", index ) }

            if ( giet_pthread_join( trdid_vld[index] , NULL ) )
            { PRINTF("\n[MJPEG ERROR] calling giet_pthread_join() for vld[%d]\n", index ) }

            if ( giet_pthread_join( trdid_iqzz[index] , NULL ) )
            { PRINTF("\n[MJPEG ERROR] calling giet_pthread_join() for iqzz[%d]\n", index ) }

            if ( USE_DCT_COPROC == 0 )
            {
                if ( giet_pthread_join( trdid_idct[index] , NULL ) )
                { PRINTF("\n[MJPEG ERROR] calling giet_pthread_join() for idct[%d]\n", index ) }
            }

            if ( giet_pthread_join( trdid_libu[index] , NULL ) )
            { PRINTF("\n[MJPEG ERROR] calling giet_pthread_join() for libu[%d]\n", index ) }

            if ( USE_DCT_COPROC )
            {
                uint32_t  cluster_xy  = (x<<4) + y;
                uint32_t  coproc_type = 2;
                giet_coproc_release( cluster_xy , coproc_type );
            }
        }
    }

    /////////////////////////////////////////////////////////////////////////////////////
    // makes instrumentation
    /////////////////////////////////////////////////////////////////////////////////////

    PRINTF("\n[MJPEG] Instumentation Results\n" )
    for ( image = 0 ; image < MAX_IMAGES ; image++ )
    { PRINTF(" - Image %d : completed at cycle %d\n", image , date[image]) }

    giet_pthread_exit( "main completed" );
    
} // end main()