encoder.c 48 KB
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/*****************************************************************************
 * x264: h264 encoder
 *****************************************************************************
 * Copyright (C) 2003 Laurent Aimar
 * $Id: encoder.c,v 1.1 2004/06/03 19:27:08 fenrir Exp $
 *
 * Authors: Laurent Aimar <fenrir@via.ecp.fr>
 *
 * 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, USA.
 *****************************************************************************/

#include <stdlib.h>
#include <stdio.h>
#include <string.h>

#include <math.h>

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#include "common/common.h"
#include "common/cpu.h"
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#include "set.h"
#include "analyse.h"
#include "ratecontrol.h"
#include "macroblock.h"

//#define DEBUG_MB_TYPE
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//#define DEBUG_DUMP_FRAME
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//#define DEBUG_BENCHMARK
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#ifdef DEBUG_BENCHMARK
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static int64_t i_mtime_encode_frame = 0;
static int64_t i_mtime_analyse = 0;
static int64_t i_mtime_encode = 0;
static int64_t i_mtime_write = 0;
static int64_t i_mtime_filter = 0;
#define TIMER_START( d ) \
    { \
        int64_t d##start = x264_mdate();

#define TIMER_STOP( d ) \
        d += x264_mdate() - d##start;\
    }
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#else
#define TIMER_START( d )
#define TIMER_STOP( d )
#endif
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/****************************************************************************
 *
 ******************************* x264 libs **********************************
 *
 ****************************************************************************/
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static int64_t x264_sqe( uint8_t *pix1, int i_pix_stride, uint8_t *pix2, int i_pix2_stride, int i_width, int i_height )
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{
    int64_t i_sqe = 0;

    int x, y;

    for( y = 0; y < i_height; y++ )
    {
        for( x = 0; x < i_width; x++ )
        {
            int tmp;

            tmp = pix1[y*i_pix_stride+x] - pix2[y*i_pix2_stride+x];

            i_sqe += tmp * tmp;
        }
    }
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    return i_sqe;
}
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static float x264_mse( int64_t i_sqe, int64_t i_size )
{
    return (double)i_sqe / ((double)65025.0 * (double)i_size);
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}

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static float x264_psnr( int64_t i_sqe, int64_t i_size )
{
    double f_mse = (double)i_sqe / ((double)65025.0 * (double)i_size);
    if( f_mse <= 0.0000000001 ) /* Max 100dB */
        return 100;

    return (float)(-10.0 * log( f_mse ) / log( 10.0 ));
}

#ifdef DEBUG_DUMP_FRAME
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static void x264_frame_dump( x264_t *h, x264_frame_t *fr, char *name )
{
    FILE * f = fopen( name, "a" );
    int i, y;

    fseek( f, 0, SEEK_END );

    for( i = 0; i < fr->i_plane; i++ )
    {
        for( y = 0; y < h->param.i_height / ( i == 0 ? 1 : 2 ); y++ )
        {
            fwrite( &fr->plane[i][y*fr->i_stride[i]], 1, h->param.i_width / ( i == 0 ? 1 : 2 ), f );
        }
    }
    fclose( f );
}
#endif


/* Fill "default" values */
static void x264_slice_header_init( x264_slice_header_t *sh, x264_param_t *param,
                                    x264_sps_t *sps, x264_pps_t *pps,
                                    int i_type, int i_idr_pic_id, int i_frame )
{
    /* First we fill all field */
    sh->sps = sps;
    sh->pps = pps;

    sh->i_type      = i_type;
    sh->i_first_mb  = 0;
    sh->i_pps_id    = pps->i_id;

    sh->i_frame_num = i_frame;

    sh->b_field_pic = 0;    /* Not field support for now */
    sh->b_bottom_field = 1; /* not yet used */

    sh->i_idr_pic_id = i_idr_pic_id;

    /* poc stuff, fixed later */
    sh->i_poc_lsb = 0;
    sh->i_delta_poc_bottom = 0;
    sh->i_delta_poc[0] = 0;
    sh->i_delta_poc[1] = 0;

    sh->i_redundant_pic_cnt = 0;

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    sh->b_direct_spatial_mv_pred = ( param->analyse.i_direct_mv_pred == X264_DIRECT_PRED_SPATIAL );
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    sh->b_num_ref_idx_override = 0;
    sh->i_num_ref_idx_l0_active = 1;
    sh->i_num_ref_idx_l1_active = 1;

    sh->i_cabac_init_idc = param->i_cabac_init_idc;

    sh->i_qp_delta = 0;
    sh->b_sp_for_swidth = 0;
    sh->i_qs_delta = 0;

    if( param->b_deblocking_filter )
    {
        sh->i_disable_deblocking_filter_idc = 0;
    }
    else
    {
        sh->i_disable_deblocking_filter_idc = 1;
    }
    sh->i_alpha_c0_offset = param->i_deblocking_filter_alphac0 << 1;
    sh->i_beta_offset = param->i_deblocking_filter_beta << 1;
}

static void x264_slice_header_write( bs_t *s, x264_slice_header_t *sh, int i_nal_ref_idc )
{
    bs_write_ue( s, sh->i_first_mb );
    bs_write_ue( s, sh->i_type + 5 );   /* same type things */
    bs_write_ue( s, sh->i_pps_id );
    bs_write( s, sh->sps->i_log2_max_frame_num, sh->i_frame_num );

    if( sh->i_idr_pic_id >= 0 ) /* NAL IDR */
    {
        bs_write_ue( s, sh->i_idr_pic_id );
    }

    if( sh->sps->i_poc_type == 0 )
    {
        bs_write( s, sh->sps->i_log2_max_poc_lsb, sh->i_poc_lsb );
        if( sh->pps->b_pic_order && !sh->b_field_pic )
        {
            bs_write_se( s, sh->i_delta_poc_bottom );
        }
    }
    else if( sh->sps->i_poc_type == 1 && !sh->sps->b_delta_pic_order_always_zero )
    {
        bs_write_se( s, sh->i_delta_poc[0] );
        if( sh->pps->b_pic_order && !sh->b_field_pic )
        {
            bs_write_se( s, sh->i_delta_poc[1] );
        }
    }

    if( sh->pps->b_redundant_pic_cnt )
    {
        bs_write_ue( s, sh->i_redundant_pic_cnt );
    }

    if( sh->i_type == SLICE_TYPE_B )
    {
        bs_write1( s, sh->b_direct_spatial_mv_pred );
    }
    if( sh->i_type == SLICE_TYPE_P || sh->i_type == SLICE_TYPE_SP || sh->i_type == SLICE_TYPE_B )
    {
        bs_write1( s, sh->b_num_ref_idx_override );
        if( sh->b_num_ref_idx_override )
        {
            bs_write_ue( s, sh->i_num_ref_idx_l0_active - 1 );
            if( sh->i_type == SLICE_TYPE_B )
            {
                bs_write_ue( s, sh->i_num_ref_idx_l1_active - 1 );
            }
        }
    }

    /* ref pic list reordering */
    if( sh->i_type != SLICE_TYPE_I )
    {
        int b_ref_pic_list_reordering_l0 = 0;
        bs_write1( s, b_ref_pic_list_reordering_l0 );
        if( b_ref_pic_list_reordering_l0 )
        {
            /* FIXME */
        }
    }
    if( sh->i_type == SLICE_TYPE_B )
    {
        int b_ref_pic_list_reordering_l1 = 0;
        bs_write1( s, b_ref_pic_list_reordering_l1 );
        if( b_ref_pic_list_reordering_l1 )
        {
            /* FIXME */
        }
    }

    if( ( sh->pps->b_weighted_pred && ( sh->i_type == SLICE_TYPE_P || sh->i_type == SLICE_TYPE_SP ) ) ||
        ( sh->pps->b_weighted_bipred == 1 && sh->i_type == SLICE_TYPE_B ) )
    {
        /* FIXME */
    }

    if( i_nal_ref_idc != 0 )
    {
        if( sh->i_idr_pic_id >= 0 )
        {
            bs_write1( s, 0 );  /* no output of prior pics flag */
            bs_write1( s, 0 );  /* long term reference flag */
        }
        else
        {
            bs_write1( s, 0 );  /* adaptive_ref_pic_marking_mode_flag */
            /* FIXME */
        }
    }

    if( sh->pps->b_cabac && sh->i_type != SLICE_TYPE_I )
    {
        bs_write_ue( s, sh->i_cabac_init_idc );
    }
    bs_write_se( s, sh->i_qp_delta );      /* slice qp delta */
#if 0
    if( sh->i_type == SLICE_TYPE_SP || sh->i_type == SLICE_TYPE_SI )
    {
        if( sh->i_type == SLICE_TYPE_SP )
        {
            bs_write1( s, sh->b_sp_for_swidth );
        }
        bs_write_se( s, sh->i_qs_delta );
    }
#endif

    if( sh->pps->b_deblocking_filter_control )
    {
        bs_write_ue( s, sh->i_disable_deblocking_filter_idc );
        if( sh->i_disable_deblocking_filter_idc != 1 )
        {
            bs_write_se( s, sh->i_alpha_c0_offset >> 1 );
            bs_write_se( s, sh->i_beta_offset >> 1 );
        }
    }
}

/****************************************************************************
 *
 ****************************************************************************
 ****************************** External API*********************************
 ****************************************************************************
 *
 ****************************************************************************/

/****************************************************************************
 * x264_encoder_open:
 ****************************************************************************/
x264_t *x264_encoder_open   ( x264_param_t *param )
{
    x264_t *h = x264_malloc( sizeof( x264_t ) );
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    int i, i_slice;
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    /* Create a copy of param */
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    memcpy( &h->param, param, sizeof( x264_param_t ) );
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    if( h->param.rc.psz_stat_out )
        h->param.rc.psz_stat_out = strdup( h->param.rc.psz_stat_out );
    if( h->param.rc.psz_stat_in )
        h->param.rc.psz_stat_in = strdup( h->param.rc.psz_stat_in );
    if( h->param.rc.psz_rc_eq )
        h->param.rc.psz_rc_eq = strdup( h->param.rc.psz_rc_eq );
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    /* Check parameters validity */
    if( param->i_width <= 0  || param->i_height <= 0 )
    {
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        x264_log( h, X264_LOG_ERROR, "invalid width x height (%dx%d)\n",
                  param->i_width, param->i_height );
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        free( h );
        return NULL;
    }

    if( param->i_width % 16 != 0 || param->i_height % 16 != 0 )
    {
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        x264_log( h, X264_LOG_ERROR, "width %% 16 != 0 or height %% 16 != 0 (%dx%d)\n",
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                 param->i_width, param->i_height );
        free( h );
        return NULL;
    }
    if( param->i_csp != X264_CSP_I420 )
    {
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        x264_log( h, X264_LOG_ERROR, "invalid CSP (only I420 supported)\n" );
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        free( h );
        return NULL;
    }

    /* Fix parameters values */
    h->param.i_frame_reference = x264_clip3( h->param.i_frame_reference, 1, 15 );
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    if( h->param.i_keyint_max <= 0 )
        h->param.i_keyint_max = 1;
    h->param.i_keyint_min = x264_clip3( h->param.i_keyint_min, 1, h->param.i_keyint_max/2+1 );
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    h->param.i_bframe = x264_clip3( h->param.i_bframe, 0, X264_BFRAME_MAX );
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    h->param.i_deblocking_filter_alphac0 = x264_clip3( h->param.i_deblocking_filter_alphac0, -6, 6 );
    h->param.i_deblocking_filter_beta    = x264_clip3( h->param.i_deblocking_filter_beta, -6, 6 );

    h->param.i_cabac_init_idc = x264_clip3( h->param.i_cabac_init_idc, -1, 2 );

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    h->param.analyse.i_subpel_refine = x264_clip3( h->param.analyse.i_subpel_refine, 1, 5 );
    if( h->param.analyse.inter & X264_ANALYSE_PSUB8x8 )
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        h->param.analyse.inter |= X264_ANALYSE_PSUB16x16;
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    if( h->param.rc.f_qblur < 0 )
        h->param.rc.f_qblur = 0;
    if( h->param.rc.f_complexity_blur < 0 )
        h->param.rc.f_complexity_blur = 0;

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    /* VUI */
    if( h->param.vui.i_sar_width > 0 && h->param.vui.i_sar_height > 0 )
    {
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        int i_w = param->vui.i_sar_width;
        int i_h = param->vui.i_sar_height;
        int a = i_w, b = i_h;
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        while( b != 0 )
        {
            int t = a;

            a = b;
            b = t % b;
        }

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        i_w /= a;
        i_h /= a;
        while( i_w > 65535 || i_h > 65535 )
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        {
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            i_w /= 2;
            i_h /= 2;
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        }

        h->param.vui.i_sar_width = 0;
        h->param.vui.i_sar_height = 0;
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        if( i_w == 0 || i_h == 0 )
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        {
            x264_log( h, X264_LOG_ERROR, "cannot create valid sample aspect ratio\n" );
        }
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        else if( i_w == i_h )
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        {
            x264_log( h, X264_LOG_INFO, "no need for a SAR\n" );
        }
        else
        {
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            x264_log( h, X264_LOG_INFO, "using SAR=%d/%d\n", i_w, i_h );
            h->param.vui.i_sar_width = i_w;
            h->param.vui.i_sar_height = i_h;
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        }
    }


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    /* Init x264_t */
    h->out.i_nal = 0;
    h->out.i_bitstream = 1000000; /* FIXME estimate max size (idth/height) */
    h->out.p_bitstream = x264_malloc( h->out.i_bitstream );

    h->i_frame = 0;
    h->i_frame_num = 0;
    h->i_poc   = 0;
    h->i_idr_pic_id = 0;

    h->sps = &h->sps_array[0];
    x264_sps_init( h->sps, 0, &h->param );

    h->pps = &h->pps_array[0];
    x264_pps_init( h->pps, 0, &h->param, h->sps);
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    h->mb.i_mb_count = h->sps->i_mb_width * h->sps->i_mb_height;
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    /* Init frames. */
    for( i = 0; i < X264_BFRAME_MAX + 1; i++ )
    {
        h->frames.current[i] = NULL;
        h->frames.next[i]    = NULL;
        h->frames.unused[i]  = NULL;
    }
    for( i = 0; i < 1 + h->param.i_bframe; i++ )
    {
        h->frames.unused[i] =  x264_frame_new( h );
    }
    for( i = 0; i < 2 + h->param.i_frame_reference; i++ )
    {
        /* 2 = 1 backward ref  + 1 fdec */
        h->frames.reference[i] = x264_frame_new( h );
    }
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    h->frames.i_last_idr = - h->param.i_keyint_max;
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    h->frames.i_input    = 0;
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    h->i_ref0 = 0;
    h->i_ref1 = 0;

    h->fdec = h->frames.reference[0];

    /* init mb cache */
    x264_macroblock_cache_init( h );

    /* init cabac adaptive model */
    x264_cabac_model_init( &h->cabac );

    /* init CPU functions */
    x264_predict_16x16_init( h->param.cpu, h->predict_16x16 );
    x264_predict_8x8_init( h->param.cpu, h->predict_8x8 );
    x264_predict_4x4_init( h->param.cpu, h->predict_4x4 );

    x264_pixel_init( h->param.cpu, &h->pixf );
    x264_dct_init( h->param.cpu, &h->dctf );
    x264_mc_init( h->param.cpu, h->mc );
    x264_csp_init( h->param.cpu, h->param.i_csp, &h->csp );

    /* rate control */
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    if( x264_ratecontrol_new( h ) < 0 )
        return NULL;
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    h->i_last_intra_size = 0;
    h->i_last_inter_size = 0;
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    /* stat */
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    for( i_slice = 0; i_slice < 5; i_slice++ )
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    {
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        h->stat.i_slice_count[i_slice] = 0;
        h->stat.i_slice_size[i_slice] = 0;
        h->stat.i_slice_qp[i_slice] = 0;

        h->stat.i_sqe_global[i_slice] = 0;
        h->stat.f_psnr_average[i_slice] = 0.0;
        h->stat.f_psnr_mean_y[i_slice] = h->stat.f_psnr_mean_u[i_slice] = h->stat.f_psnr_mean_v[i_slice] = 0.0;
        
        for( i = 0; i < 18; i++ )
            h->stat.i_mb_count[i_slice][i] = 0;
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    }
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    x264_log( h, X264_LOG_INFO, "using cpu capabilities %s%s%s%s%s%s\n",
             param->cpu&X264_CPU_MMX ? "MMX " : "",
             param->cpu&X264_CPU_MMXEXT ? "MMXEXT " : "",
             param->cpu&X264_CPU_SSE ? "SSE " : "",
             param->cpu&X264_CPU_SSE2 ? "SSE2 " : "",
             param->cpu&X264_CPU_3DNOW ? "3DNow! " : "",
             param->cpu&X264_CPU_ALTIVEC ? "Altivec " : "" );

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    return h;
}

/* internal usage */
static void x264_nal_start( x264_t *h, int i_type, int i_ref_idc )
{
    x264_nal_t *nal = &h->out.nal[h->out.i_nal];

    nal->i_ref_idc = i_ref_idc;
    nal->i_type    = i_type;

    bs_align_0( &h->out.bs );   /* not needed */

    nal->i_payload= 0;
    nal->p_payload= &h->out.p_bitstream[bs_pos( &h->out.bs) / 8];
}
static void x264_nal_end( x264_t *h )
{
    x264_nal_t *nal = &h->out.nal[h->out.i_nal];

    bs_align_0( &h->out.bs );   /* not needed */

    nal->i_payload = &h->out.p_bitstream[bs_pos( &h->out.bs)/8] - nal->p_payload;

    h->out.i_nal++;
}

/****************************************************************************
 * x264_encoder_headers:
 ****************************************************************************/
int x264_encoder_headers( x264_t *h, x264_nal_t **pp_nal, int *pi_nal )
{
    /* init bitstream context */
    h->out.i_nal = 0;
    bs_init( &h->out.bs, h->out.p_bitstream, h->out.i_bitstream );

    /* Put SPS and PPS */
    if( h->i_frame == 0 )
    {
        /* generate sequence parameters */
        x264_nal_start( h, NAL_SPS, NAL_PRIORITY_HIGHEST );
        x264_sps_write( &h->out.bs, h->sps );
        x264_nal_end( h );

        /* generate picture parameters */
        x264_nal_start( h, NAL_PPS, NAL_PRIORITY_HIGHEST );
        x264_pps_write( &h->out.bs, h->pps );
        x264_nal_end( h );
    }
    /* now set output*/
    *pi_nal = h->out.i_nal;
    *pp_nal = &h->out.nal[0];

    return 0;
}


static void x264_frame_put( x264_frame_t *list[X264_BFRAME_MAX], x264_frame_t *frame )
{
    int i = 0;

    while( list[i] != NULL ) i++;

    list[i] = frame;
}

static x264_frame_t *x264_frame_get( x264_frame_t *list[X264_BFRAME_MAX+1] )
{
    x264_frame_t *frame = list[0];
    int i;

    for( i = 0; i < X264_BFRAME_MAX; i++ )
    {
        list[i] = list[i+1];
    }
    list[X264_BFRAME_MAX] = NULL;

    return frame;
}

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/* Sort queued frames into input order */
static void x264_frame_sort( x264_frame_t *list[X264_BFRAME_MAX+1] )
{
    int i, b_ok;
    do {
        b_ok = 1;
        for( i = 0; i < X264_BFRAME_MAX && list[i+1]; i++ )
        {
            if( list[i]->i_frame > list[i+1]->i_frame )
            {
                x264_frame_t *tmp = list[i+1];
                list[i+1] = list[i];
                list[i] = tmp;
                b_ok = 0;
            }
        }
    } while( !b_ok );
}

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static inline void x264_reference_build_list( x264_t *h, int i_poc )
{
    int i;
    int b_ok;

    /* build ref list 0/1 */
    h->i_ref0 = 0;
    h->i_ref1 = 0;
    for( i = 1; i < h->param.i_frame_reference+2; i++ )
    {
        if( h->frames.reference[i]->i_poc >= 0 )
        {
            if( h->frames.reference[i]->i_poc < i_poc )
            {
                h->fref0[h->i_ref0++] = h->frames.reference[i];
            }
            else if( h->frames.reference[i]->i_poc > i_poc )
            {
                h->fref1[h->i_ref1++] = h->frames.reference[i];
            }
        }
    }
    /* Order ref0 from higher to lower poc */
    do
    {
        b_ok = 1;
        for( i = 0; i < h->i_ref0 - 1; i++ )
        {
            if( h->fref0[i]->i_poc < h->fref0[i+1]->i_poc )
            {
                x264_frame_t *tmp = h->fref0[i+1];

                h->fref0[i+1] = h->fref0[i];
                h->fref0[i] = tmp;
                b_ok = 0;
                break;
            }
        }
    } while( !b_ok );
    /* Order ref1 from lower to higher poc (bubble sort) for B-frame */
    do
    {
        b_ok = 1;
        for( i = 0; i < h->i_ref1 - 1; i++ )
        {
            if( h->fref1[i]->i_poc > h->fref1[i+1]->i_poc )
            {
                x264_frame_t *tmp = h->fref1[i+1];

                h->fref1[i+1] = h->fref1[i];
                h->fref1[i] = tmp;
                b_ok = 0;
                break;
            }
        }
    } while( !b_ok );

    if( h->i_ref0 > h->param.i_frame_reference )
    {
        h->i_ref0 = h->param.i_frame_reference;
    }
    if( h->i_ref1 > 1 )
    {
        h->i_ref1 = 1;
    }
}

static inline void x264_reference_update( x264_t *h )
{
    int i;

    /* apply deblocking filter to the current decoded picture */
    if( h->param.b_deblocking_filter )
    {
        TIMER_START( i_mtime_filter );
        x264_frame_deblocking_filter( h, h->sh.i_type );
        TIMER_STOP( i_mtime_filter );
    }
    /* expand border */
    x264_frame_expand_border( h->fdec );

    /* move frame in the buffer */
    h->fdec = h->frames.reference[h->param.i_frame_reference+1];
    for( i = h->param.i_frame_reference+1; i > 0; i-- )
    {
        h->frames.reference[i] = h->frames.reference[i-1];
    }
    h->frames.reference[0] = h->fdec;
}

static inline void x264_reference_reset( x264_t *h )
{
    int i;

    /* reset ref pictures */
    for( i = 1; i < h->param.i_frame_reference+2; i++ )
    {
        h->frames.reference[i]->i_poc = -1;
    }
    h->frames.reference[0]->i_poc = 0;
}

static inline void x264_slice_init( x264_t *h, int i_nal_type, int i_slice_type, int i_global_qp )
{
    /* ------------------------ Create slice header  ----------------------- */
    if( i_nal_type == NAL_SLICE_IDR )
    {
        x264_slice_header_init( &h->sh, &h->param, h->sps, h->pps, i_slice_type, h->i_idr_pic_id, h->i_frame_num - 1 );

        /* increment id */
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        h->i_idr_pic_id = ( h->i_idr_pic_id + 1 ) % 65536;
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    }
    else
    {
        x264_slice_header_init( &h->sh, &h->param, h->sps, h->pps, i_slice_type, -1, h->i_frame_num - 1 );

        /* always set the real higher num of ref frame used */
        h->sh.b_num_ref_idx_override = 1;
        h->sh.i_num_ref_idx_l0_active = h->i_ref0 <= 0 ? 1 : h->i_ref0;
        h->sh.i_num_ref_idx_l1_active = h->i_ref1 <= 0 ? 1 : h->i_ref1;
    }

    if( h->sps->i_poc_type == 0 )
    {
        h->sh.i_poc_lsb = h->fdec->i_poc & ( (1 << h->sps->i_log2_max_poc_lsb) - 1 );
        h->sh.i_delta_poc_bottom = 0;   /* XXX won't work for field */
    }
    else if( h->sps->i_poc_type == 1 )
    {
        /* FIXME TODO FIXME */
    }
    else
    {
        /* Nothing to do ? */
    }

    /* global qp */
    h->sh.i_qp_delta = i_global_qp - h->pps->i_pic_init_qp;

    /* get adapative cabac model if needed */
    if( h->param.b_cabac )
    {
        if( h->param.i_cabac_init_idc == -1 )
        {
            h->sh.i_cabac_init_idc = x264_cabac_model_get( &h->cabac, i_slice_type );
        }
    }
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    x264_macroblock_slice_init( h );
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}

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static inline void x264_slice_write( x264_t *h, int i_nal_type, int i_nal_ref_idc )
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{
    int i_skip;
    int mb_xy;
    int i;

    /* Init stats */
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    h->stat.frame.i_hdr_bits  =
    h->stat.frame.i_itex_bits =
    h->stat.frame.i_ptex_bits =
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    h->stat.frame.i_misc_bits =
    h->stat.frame.i_intra_cost =
    h->stat.frame.i_inter_cost = 0;
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    for( i = 0; i < 18; i++ )
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        h->stat.frame.i_mb_count[i] = 0;
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    /* Slice */
    x264_nal_start( h, i_nal_type, i_nal_ref_idc );

    /* Slice header */
    x264_slice_header_write( &h->out.bs, &h->sh, i_nal_ref_idc );
    if( h->param.b_cabac )
    {
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        /* alignment needed */
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        bs_align_1( &h->out.bs );

        /* init cabac */
        x264_cabac_context_init( &h->cabac, h->sh.i_type, h->sh.pps->i_pic_init_qp + h->sh.i_qp_delta, h->sh.i_cabac_init_idc );
        x264_cabac_encode_init ( &h->cabac, &h->out.bs );
    }
    h->mb.i_last_qp = h->pps->i_pic_init_qp + h->sh.i_qp_delta;
    h->mb.i_last_dqp = 0;

    for( mb_xy = 0, i_skip = 0; mb_xy < h->sps->i_mb_width * h->sps->i_mb_height; mb_xy++ )
    {
        const int i_mb_y = mb_xy / h->sps->i_mb_width;
        const int i_mb_x = mb_xy % h->sps->i_mb_width;

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        int mb_spos = bs_pos(&h->out.bs);

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        /* load cache */
        x264_macroblock_cache_load( h, i_mb_x, i_mb_y );

        /* analyse parameters
         * Slice I: choose I_4x4 or I_16x16 mode
         * Slice P: choose between using P mode or intra (4x4 or 16x16)
         * */
        TIMER_START( i_mtime_analyse );
        x264_macroblock_analyse( h );
        TIMER_STOP( i_mtime_analyse );

        /* encode this macrobock -> be carefull it can change the mb type to P_SKIP if needed */
        TIMER_START( i_mtime_encode );
        x264_macroblock_encode( h );
        TIMER_STOP( i_mtime_encode );

        TIMER_START( i_mtime_write );
        if( IS_SKIP( h->mb.i_type ) )
        {
            if( h->param.b_cabac )
            {
                if( mb_xy > 0 )
                {
                    /* not end_of_slice_flag */
                    x264_cabac_encode_terminal( &h->cabac, 0 );
                }

                x264_cabac_mb_skip( h, 1 );
            }
            else
            {
                i_skip++;
            }
        }
        else
        {
            if( h->param.b_cabac )
            {
                if( mb_xy > 0 )
                {
                    /* not end_of_slice_flag */
                    x264_cabac_encode_terminal( &h->cabac, 0 );
                }
                if( h->sh.i_type != SLICE_TYPE_I )
                {
                    x264_cabac_mb_skip( h, 0 );
                }
                x264_macroblock_write_cabac( h, &h->out.bs );
            }
            else
            {
                if( h->sh.i_type != SLICE_TYPE_I )
                {
                    bs_write_ue( &h->out.bs, i_skip );  /* skip run */
                    i_skip = 0;
                }
                x264_macroblock_write_cavlc( h, &h->out.bs );
            }
        }
        TIMER_STOP( i_mtime_write );

        /* save cache */
        x264_macroblock_cache_save( h );

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        h->stat.frame.i_mb_count[h->mb.i_type]++;
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        x264_ratecontrol_mb(h, bs_pos(&h->out.bs) - mb_spos);
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    }

    if( h->param.b_cabac )
    {
        /* end of slice */
        x264_cabac_encode_terminal( &h->cabac, 1 );
    }
    else if( i_skip > 0 )
    {
        bs_write_ue( &h->out.bs, i_skip );  /* last skip run */
    }

    if( h->param.b_cabac )
    {
        int i_cabac_word;
        x264_cabac_encode_flush( &h->cabac );
        /* TODO cabac stuffing things (p209) */
        i_cabac_word = (((3 * h->cabac.i_sym_cnt - 3 * 96 * h->sps->i_mb_width * h->sps->i_mb_height)/32) - bs_pos( &h->out.bs)/8)/3;

        while( i_cabac_word > 0 )
        {
            bs_write( &h->out.bs, 16, 0x0000 );
            i_cabac_word--;
        }
    }
    else
    {
        /* rbsp_slice_trailing_bits */
        bs_rbsp_trailing( &h->out.bs );
    }

    x264_nal_end( h );
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    /* Compute misc bits */
    h->stat.frame.i_misc_bits = bs_pos( &h->out.bs )
                              - h->stat.frame.i_itex_bits
                              - h->stat.frame.i_ptex_bits
                              - h->stat.frame.i_hdr_bits;
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}

/****************************************************************************
 * x264_encoder_encode:
 *  XXX: i_poc   : is the poc of the current given picture
 *       i_frame : is the number of the frame being coded
 *  ex:  type frame poc
 *       I      0   2*0
 *       P      1   2*3
 *       B      2   2*1
 *       B      3   2*2
 *       P      4   2*6
 *       B      5   2*4
 *       B      6   2*5
 ****************************************************************************/
int     x264_encoder_encode( x264_t *h,
                             x264_nal_t **pp_nal, int *pi_nal,
                             x264_picture_t *pic )
{
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    x264_frame_t   *frame_psnr = h->fdec; /* just to keep the current decoded frame for psnr calculation */
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    int     i_nal_type;
    int     i_nal_ref_idc;
    int     i_slice_type;

    int i;

    int   i_global_qp;

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    char psz_message[80];

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    /* no data out */
    *pi_nal = 0;
    *pp_nal = NULL;


    /* ------------------- Setup new frame from picture -------------------- */
    TIMER_START( i_mtime_encode_frame );
    if( pic != NULL )
    {
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        /* 1: Copy the picture to a frame and move it to a buffer */
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        x264_frame_t *fenc = x264_frame_get( h->frames.unused );

        x264_frame_copy_picture( h, fenc, pic );

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        fenc->i_frame = h->frames.i_input++;

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        x264_frame_put( h->frames.next, fenc );

        if( h->frames.i_input <= h->param.i_bframe )
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        {
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            /* Nothing yet to encode */
            /* waiting for filling bframe buffer */
            pic->i_type = X264_TYPE_AUTO;
            return 0;
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        }
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    }
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    if( h->frames.current[0] == NULL )
    {
        /* 2: Select frame types */
        x264_frame_t *frm;
        int bframes;
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        if( h->frames.next[0] == NULL )
            return 0;
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        if( h->param.rc.b_stat_read )
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        {
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            /* Use the frame types from the first pass */
            for( i = 0; h->frames.next[i] != NULL; i++ )
                h->frames.next[i]->i_type =
                    x264_ratecontrol_slice_type( h, h->frames.next[i]->i_frame );
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        }
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        for( bframes = 0;; bframes++ )
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        {
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            frm = h->frames.next[bframes];

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            /* Limit GOP size */
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            if( frm->i_frame - h->frames.i_last_idr >= h->param.i_keyint_max )
            {
                if( frm->i_type == X264_TYPE_AUTO )
                    frm->i_type = X264_TYPE_IDR;
                if( frm->i_type != X264_TYPE_IDR )
                    x264_log( h, X264_LOG_ERROR, "specified frame type (%d) is not compatible with keyframe interval\n", frm->i_type );
            }
            if( frm->i_type == X264_TYPE_IDR )
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            {
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                h->i_poc = 0;
                h->i_frame_num = 0;

                /* Close GOP */
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                if( bframes > 0 )
                {
                    bframes--;
                    h->frames.next[bframes]->i_type = X264_TYPE_P;
                }
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            }

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            if( bframes == h->param.i_bframe
                || h->frames.next[bframes+1] == NULL )
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            {
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                if( frm->i_type == X264_TYPE_B )
                    x264_log( h, X264_LOG_ERROR, "specified frame type is not compatible with max B-frames\n" );
                if(    frm->i_type == X264_TYPE_AUTO
                    || frm->i_type == X264_TYPE_B )
                    frm->i_type = X264_TYPE_P;
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            }
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            frm->i_poc = h->i_poc;
            h->i_poc += 2;

            if( frm->i_type != X264_TYPE_AUTO && frm->i_type != X264_TYPE_B )
                break;

            frm->i_type = X264_TYPE_B;
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        }