encoder.c

图象压缩程序

/*****************************************************************************
 * x264: h264 encoder
 *****************************************************************************
 * Copyright (C) 2003 Laurent Aimar
 * $Id: encoder.c,v 1.12 2004/03/28 09:21:44 fenrir Exp $
 *
 * Authors: Laurent Aimar <[e-mail]>
 *
 * 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 <stdint.h>

#include <math.h>

#include "../core/common.h"
#include "../core/cpu.h"

#include "set.h"
#include "analyse.h"
#include "ratecontrol.h"
#include "macroblock.h"

/****************************************************************************
 *
 ******************************* x264 libs **********************************
 *
 ****************************************************************************/


static float x264_psnr( uint8_t *pix1, int i_pix_stride, uint8_t *pix2, int i_pix2_stride, int i_width, int i_height )
{
    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;
        }
    }

    if( i_sqe == 0 )
    {
        return -1.0;
    }
    return (float)(10.0 * log( (double)65025.0 * (double)i_height * (double)i_width / (double)i_sqe ) / log( 10.0 ));
}

/* 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;

    sh->b_direct_spatial_mv_pred = 0;

    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 = 0;
    sh->i_beta_offset = 0;
}

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 );
        }
    }
}
#if 0
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

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

/****************************************************************************
 * x264_encoder_open:
 ****************************************************************************/
x264_t *x264_encoder_open   ( x264_param_t *param )
{
    x264_t *h = x264_malloc( sizeof( x264_t ) );
    int i;
    x264_me_t me[2];

    if( param->i_width <= 0  || param->i_height <= 0 )
    {
        fprintf( stderr, "invalid width x height (%dx%d)\n",
                 param->i_width, param->i_height );
        free( h );
        return NULL;
    }

    if( param->i_width % 16 != 0 || param->i_height % 16 != 0 )
    {
        fprintf( stderr, "width %% 16 != 0 pr height %% 16 != 0 (%dx%d)\n",
                 param->i_width, param->i_height );
        free( h );
        return NULL;
    }

    memcpy( &h->param, param, sizeof( x264_param_t ) );
    if( h->param.i_frame_reference <= 0 )
    {
        h->param.i_frame_reference = 1;
    }
    else if( h->param.i_frame_reference > 15 )
    {
        h->param.i_frame_reference = 15;
    }
    if( h->param.i_idrframe <= 0 )
    {
        h->param.i_idrframe = 1;
    }
    if( h->param.i_iframe <= 0 )
    {
        h->param.i_iframe = 1;
    }
    if( h->param.i_bframe < 0 )
    {
        h->param.i_bframe = 0;
    }
    else if( h->param.i_bframe > X264_BFRAME_MAX )
    {
        h->param.i_bframe = X264_BFRAME_MAX;
    }
    /* XXX for now we use fixed patern IB...BPB...BPB...BP */
    if( h->param.i_bframe > 0 )
    {
        h->param.i_iframe = ((h->param.i_iframe - 1)/(h->param.i_bframe+1))*(h->param.i_bframe+1) + 1;

        if( h->param.b_cabac )
        {
            fprintf( stderr, "cabac not supported with B frame (cabac disabled)\n" );
            h->param.b_cabac = 0;
        }
    }
    if( h->param.i_cabac_init_idc < -1 )
    {
        h->param.i_cabac_init_idc = -1;
    }
    else if( h->param.i_cabac_init_idc > 2 )
    {
        h->param.i_cabac_init_idc = 2;
    }

    h->cpu = param->cpu;

    h->i_nal = 0;
    h->i_bitstream = 1000000; /* FIXME calculate max size from width/height */
    h->p_bitstream = x264_malloc( h->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);

    /* init picture and bframe context */
    h->picture = NULL;
    for( i = 0; i < X264_BFRAME_MAX; i++ )
    {
        h->bframe_current[i]= NULL;
        h->frame_next[i]    = NULL;
        h->frame_unused[i]  = NULL;
    }
    h->frame_next[X264_BFRAME_MAX]  = NULL;
    h->frame_unused[X264_BFRAME_MAX]= NULL;
    for( i = 0; i < h->param.i_bframe+1; i++ )
    {
        h->frame_unused[i] = x264_frame_new( h );