mpegvideo.c

从FFMPEG转换而来的H264解码程序,VC下编译..

/*
 * The simplest mpeg encoder (well, it was the simplest!)
 * Copyright (c) 2000,2001 Fabrice Bellard.
 * Copyright (c) 2002-2004 Michael Niedermayer <[e-mail]>
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 *
 * 4MV & hq & b-frame encoding stuff by Michael Niedermayer <[e-mail]>
 */

/**
 * @file mpegvideo.c
 * The simplest mpeg encoder (well, it was the simplest!).
 */

#include "avcodec.h"
#include "dsputil.h"
#include "mpegvideo.h"
#include "mjpegenc.h"
#include "faandct.h"
#include <limits.h>

//#undef NDEBUG
//#include <assert.h>

#ifdef CONFIG_ENCODERS
static int encode_picture(MpegEncContext *s, int picture_number);
#endif //CONFIG_ENCODERS
static void dct_unquantize_mpeg1_intra_c(MpegEncContext *s,
                                   DCTELEM *block, int n, int qscale);
static void dct_unquantize_mpeg1_inter_c(MpegEncContext *s,
                                   DCTELEM *block, int n, int qscale);
static void dct_unquantize_mpeg2_intra_c(MpegEncContext *s,
                                   DCTELEM *block, int n, int qscale);
static void dct_unquantize_mpeg2_intra_bitexact(MpegEncContext *s,
                                   DCTELEM *block, int n, int qscale);
static void dct_unquantize_mpeg2_inter_c(MpegEncContext *s,
                                   DCTELEM *block, int n, int qscale);
static void dct_unquantize_h263_intra_c(MpegEncContext *s,
                                  DCTELEM *block, int n, int qscale);
static void dct_unquantize_h263_inter_c(MpegEncContext *s,
                                  DCTELEM *block, int n, int qscale);
static void draw_edges_c(uint8_t *buf, int wrap, int width, int height, int w);
#ifdef CONFIG_ENCODERS
static int dct_quantize_c(MpegEncContext *s, DCTELEM *block, int n, int qscale, int *overflow);
static int dct_quantize_trellis_c(MpegEncContext *s, DCTELEM *block, int n, int qscale, int *overflow);
static int dct_quantize_refine(MpegEncContext *s, DCTELEM *block, int16_t *weight, DCTELEM *orig, int n, int qscale);
static int sse_mb(MpegEncContext *s);
static void denoise_dct_c(MpegEncContext *s, DCTELEM *block);
#endif //CONFIG_ENCODERS

#ifdef HAVE_XVMC
extern int  XVMC_field_start(MpegEncContext*s, AVCodecContext *avctx);
extern void XVMC_field_end(MpegEncContext *s);
extern void XVMC_decode_mb(MpegEncContext *s);
#endif

void (*draw_edges)(uint8_t *buf, int wrap, int width, int height, int w)= draw_edges_c;


/* enable all paranoid tests for rounding, overflows, etc... */
//#define PARANOID

//#define DEBUG


#ifdef CONFIG_ENCODERS
static const uint16_t aanscales[64] = {
    /* precomputed values scaled up by 14 bits */
    16384, 22725, 21407, 19266, 16384, 12873,  8867,  4520,
    22725, 31521, 29692, 26722, 22725, 17855, 12299,  6270,
    21407, 29692, 27969, 25172, 21407, 16819, 11585,  5906,
    19266, 26722, 25172, 22654, 19266, 15137, 10426,  5315,
    16384, 22725, 21407, 19266, 16384, 12873,  8867,  4520,
    12873, 17855, 16819, 15137, 12873, 10114,  6967,  3552,
    8867 , 12299, 11585, 10426,  8867,  6967,  4799,  2446,
    4520 ,  6270,  5906,  5315,  4520,  3552,  2446,  1247
};
#endif //CONFIG_ENCODERS

static const uint8_t h263_chroma_roundtab[16] = {
//  0  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15
    0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2,
};

static const uint8_t ff_default_chroma_qscale_table[32]={
//  0  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
    0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31
};

#ifdef CONFIG_ENCODERS
static uint8_t default_mv_penalty[MAX_FCODE+1][MAX_MV*2+1];
static uint8_t default_fcode_tab[MAX_MV*2+1];

enum PixelFormat ff_yuv420p_list[2]= {PIX_FMT_YUV420P, -1};

static void convert_matrix(DSPContext *dsp, int (*qmat)[64], uint16_t (*qmat16)[2][64],
                           const uint16_t *quant_matrix, int bias, int qmin, int qmax, int intra)
{
    int qscale;
    int shift=0;

    for(qscale=qmin; qscale<=qmax; qscale++){
        int i;
        if (dsp->fdct == ff_jpeg_fdct_islow
#ifdef FAAN_POSTSCALE
            || dsp->fdct == ff_faandct
#endif
            ) {
            for(i=0;i<64;i++) {
                const int j= dsp->idct_permutation[i];
                /* 16 <= qscale * quant_matrix[i] <= 7905 */
                /* 19952         <= aanscales[i] * qscale * quant_matrix[i]           <= 249205026 */
                /* (1<<36)/19952 >= (1<<36)/(aanscales[i] * qscale * quant_matrix[i]) >= (1<<36)/249205026 */
                /* 3444240       >= (1<<36)/(aanscales[i] * qscale * quant_matrix[i]) >= 275 */

                qmat[qscale][i] = (int)((UINT64_C(1) << QMAT_SHIFT) /
                                (qscale * quant_matrix[j]));
            }
        } else if (dsp->fdct == fdct_ifast
#ifndef FAAN_POSTSCALE
                   || dsp->fdct == ff_faandct
#endif
                   ) {
            for(i=0;i<64;i++) {
                const int j= dsp->idct_permutation[i];
                /* 16 <= qscale * quant_matrix[i] <= 7905 */
                /* 19952         <= aanscales[i] * qscale * quant_matrix[i]           <= 249205026 */
                /* (1<<36)/19952 >= (1<<36)/(aanscales[i] * qscale * quant_matrix[i]) >= (1<<36)/249205026 */
                /* 3444240       >= (1<<36)/(aanscales[i] * qscale * quant_matrix[i]) >= 275 */

                qmat[qscale][i] = (int)((UINT64_C(1) << (QMAT_SHIFT + 14)) /
                                (aanscales[i] * qscale * quant_matrix[j]));
            }
        } else {
            for(i=0;i<64;i++) {
                const int j= dsp->idct_permutation[i];
                /* We can safely suppose that 16 <= quant_matrix[i] <= 255
                   So 16           <= qscale * quant_matrix[i]             <= 7905
                   so (1<<19) / 16 >= (1<<19) / (qscale * quant_matrix[i]) >= (1<<19) / 7905
                   so 32768        >= (1<<19) / (qscale * quant_matrix[i]) >= 67
                */
                qmat[qscale][i] = (int)((UINT64_C(1) << QMAT_SHIFT) / (qscale * quant_matrix[j]));
//                qmat  [qscale][i] = (1 << QMAT_SHIFT_MMX) / (qscale * quant_matrix[i]);
                qmat16[qscale][0][i] = (1 << QMAT_SHIFT_MMX) / (qscale * quant_matrix[j]);

                if(qmat16[qscale][0][i]==0 || qmat16[qscale][0][i]==128*256) qmat16[qscale][0][i]=128*256-1;
                qmat16[qscale][1][i]= ROUNDED_DIV(bias<<(16-QUANT_BIAS_SHIFT), qmat16[qscale][0][i]);
            }
        }

        for(i=intra; i<64; i++){
            int64_t max= 8191;
            if (dsp->fdct == fdct_ifast
#ifndef FAAN_POSTSCALE
                   || dsp->fdct == ff_faandct
#endif
                   ) {
                max= (8191LL*aanscales[i]) >> 14;
            }
            while(((max * qmat[qscale][i]) >> shift) > INT_MAX){
                shift++;
            }
        }
    }
    if(shift){
        av_log(NULL, AV_LOG_INFO, "Warning, QMAT_SHIFT is larger than %d, overflows possible\n", QMAT_SHIFT - shift);
    }
}

static inline void update_qscale(MpegEncContext *s){
    s->qscale= (s->lambda*139 + FF_LAMBDA_SCALE*64) >> (FF_LAMBDA_SHIFT + 7);
    s->qscale= av_clip(s->qscale, s->avctx->qmin, s->avctx->qmax);

    s->lambda2= (s->lambda*s->lambda + FF_LAMBDA_SCALE/2) >> FF_LAMBDA_SHIFT;
}
#endif //CONFIG_ENCODERS

void ff_init_scantable(uint8_t *permutation, ScanTable *st, const uint8_t *src_scantable){
    int i;
    int end;

    st->scantable= src_scantable;

    for(i=0; i<64; i++){
        int j;
        j = src_scantable[i];
        st->permutated[i] = permutation[j];
    }

    end=-1;
    for(i=0; i<64; i++){
        int j;
        j = st->permutated[i];
        if(j>end) end=j;
        st->raster_end[i]= end;
    }
}

#ifdef CONFIG_ENCODERS
void ff_write_quant_matrix(PutBitContext *pb, uint16_t *matrix){
    int i;

    if(matrix){
        put_bits(pb, 1, 1);
        for(i=0;i<64;i++) {
            put_bits(pb, 8, matrix[ ff_zigzag_direct[i] ]);
        }
    }else
        put_bits(pb, 1, 0);
}
#endif //CONFIG_ENCODERS

const uint8_t *ff_find_start_code(const uint8_t * restrict p, const uint8_t *end, uint32_t * restrict state){
    int i;

    assert(p<=end);
    if(p>=end)
        return end;

    for(i=0; i<3; i++){
        uint32_t tmp= *state << 8;
        *state= tmp + *(p++);
        if(tmp == 0x100 || p==end)
            return p;
    }

    while(p<end){
        if     (p[-1] > 1      ) p+= 3;
        else if(p[-2]          ) p+= 2;
        else if(p[-3]|(p[-1]-1)) p++;
        else{
            p++;
            break;
        }
    }

    p= FFMIN(p, end)-4;
    *state=  be2me_32(unaligned32(p));

    return p+4;
}

/* init common dct for both encoder and decoder */
int DCT_common_init(MpegEncContext *s)
{
    s->dct_unquantize_h263_intra = dct_unquantize_h263_intra_c;
    s->dct_unquantize_h263_inter = dct_unquantize_h263_inter_c;
    s->dct_unquantize_mpeg1_intra = dct_unquantize_mpeg1_intra_c;
    s->dct_unquantize_mpeg1_inter = dct_unquantize_mpeg1_inter_c;
    s->dct_unquantize_mpeg2_intra = dct_unquantize_mpeg2_intra_c;
    if(s->flags & CODEC_FLAG_BITEXACT)
        s->dct_unquantize_mpeg2_intra = dct_unquantize_mpeg2_intra_bitexact;
    s->dct_unquantize_mpeg2_inter = dct_unquantize_mpeg2_inter_c;

#ifdef HAVE_MMX
    MPV_common_init_mmx(s);
#endif

#ifdef CONFIG_ENCODERS
    if(!s->dct_quantize)
        s->dct_quantize= dct_quantize_c;
    if(!s->denoise_dct)
        s->denoise_dct= denoise_dct_c;
    s->fast_dct_quantize= s->dct_quantize;

    if(s->flags&CODEC_FLAG_TRELLIS_QUANT){
        s->dct_quantize= dct_quantize_trellis_c; //move before MPV_common_init_*
    }

#endif //CONFIG_ENCODERS

    /* load & permutate scantables
       note: only wmv uses different ones
    */
    if(s->alternate_scan){
        ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable  , ff_alternate_vertical_scan);
        ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable  , ff_alternate_vertical_scan);
    }else{
        ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable  , ff_zigzag_direct);
        ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable  , ff_zigzag_direct);
    }
    ff_init_scantable(s->dsp.idct_permutation, &s->intra_h_scantable, ff_alternate_horizontal_scan);
    ff_init_scantable(s->dsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);

    return 0;
}

static void copy_picture(Picture *dst, Picture *src){
    *dst = *src;
    dst->type= FF_BUFFER_TYPE_COPY;
}

#ifdef CONFIG_ENCODERS
static void copy_picture_attributes(MpegEncContext *s, AVFrame *dst, AVFrame *src){
    int i;

    dst->pict_type              = src->pict_type;
    dst->quality                = src->quality;
    dst->coded_picture_number   = src->coded_picture_number;
    dst->display_picture_number = src->display_picture_number;
//    dst->reference              = src->reference;
    dst->pts                    = src->pts;
    dst->interlaced_frame       = src->interlaced_frame;
    dst->top_field_first        = src->top_field_first;

    if(s->avctx->me_threshold){
        if(!src->motion_val[0])
            av_log(s->avctx, AV_LOG_ERROR, "AVFrame.motion_val not set!\n");
        if(!src->mb_type)
            av_log(s->avctx, AV_LOG_ERROR, "AVFrame.mb_type not set!\n");
        if(!src->ref_index[0])
            av_log(s->avctx, AV_LOG_ERROR, "AVFrame.ref_index not set!\n");
        if(src->motion_subsample_log2 != dst->motion_subsample_log2)
            av_log(s->avctx, AV_LOG_ERROR, "AVFrame.motion_subsample_log2 doesn't match! (%d!=%d)\n",
            src->motion_subsample_log2, dst->motion_subsample_log2);

        memcpy(dst->mb_type, src->mb_type, s->mb_stride * s->mb_height * sizeof(dst->mb_type[0]));

        for(i=0; i<2; i++){
            int stride= ((16*s->mb_width )>>src->motion_subsample_log2) + 1;
            int height= ((16*s->mb_height)>>src->motion_subsample_log2);

            if(src->motion_val[i] && src->motion_val[i] != dst->motion_val[i]){
                memcpy(dst->motion_val[i], src->motion_val[i], 2*stride*height*sizeof(int16_t));
            }
            if(src->ref_index[i] && src->ref_index[i] != dst->ref_index[i]){
                memcpy(dst->ref_index[i], src->ref_index[i], s->b8_stride*2*s->mb_height*sizeof(int8_t));
            }
        }
    }
}
#endif

/**
 * allocates a Picture
 * The pixels are allocated/set by calling get_buffer() if shared=0
 */
static int alloc_picture(MpegEncContext *s, Picture *pic, int shared){
    const int big_mb_num= s->mb_stride*(s->mb_height+1) + 1; //the +1 is needed so memset(,,stride*height) does not sig11