mpeg12enc.c 34.3 KB
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/*
 * MPEG1/2 encoder
 * Copyright (c) 2000,2001 Fabrice Bellard.
 * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
 *
 * 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
 */

/**
 * @file mpeg12enc.c
 * MPEG1/2 encoder
 */

#include "avcodec.h"
#include "dsputil.h"
#include "mpegvideo.h"

#include "mpeg12.h"
#include "mpeg12data.h"
#include "bytestream.h"


static const uint8_t inv_non_linear_qscale[13] = {
    0, 2, 4, 6, 8,
    9,10,11,12,13,14,15,16,
};

static const uint8_t svcd_scan_offset_placeholder[14] = {
    0x10, 0x0E,
    0x00, 0x80, 0x81,
    0x00, 0x80, 0x81,
    0xff, 0xff, 0xff,
    0xff, 0xff, 0xff,
};

static void mpeg1_encode_block(MpegEncContext *s,
                         DCTELEM *block,
                         int component);
static void mpeg1_encode_motion(MpegEncContext *s, int val, int f_or_b_code);    // RAL: f_code parameter added

static uint8_t mv_penalty[MAX_FCODE+1][MAX_MV*2+1];
static uint8_t fcode_tab[MAX_MV*2+1];

static uint8_t  uni_mpeg1_ac_vlc_len [64*64*2];
static uint8_t  uni_mpeg2_ac_vlc_len [64*64*2];

/* simple include everything table for dc, first byte is bits number next 3 are code*/
static uint32_t mpeg1_lum_dc_uni[512];
static uint32_t mpeg1_chr_dc_uni[512];

static uint8_t mpeg1_index_run[2][64];
static int8_t mpeg1_max_level[2][64];

static void init_uni_ac_vlc(RLTable *rl, uint8_t *uni_ac_vlc_len){
    int i;

    for(i=0; i<128; i++){
        int level= i-64;
        int run;
        for(run=0; run<64; run++){
            int len, bits, code;

            int alevel= FFABS(level);
            int sign= (level>>31)&1;

            if (alevel > rl->max_level[0][run])
                code= 111; /*rl->n*/
            else
                code= rl->index_run[0][run] + alevel - 1;

            if (code < 111 /* rl->n */) {
                /* store the vlc & sign at once */
                len=   rl->table_vlc[code][1]+1;
                bits= (rl->table_vlc[code][0]<<1) + sign;
            } else {
                len=  rl->table_vlc[111/*rl->n*/][1]+6;
                bits= rl->table_vlc[111/*rl->n*/][0]<<6;

                bits|= run;
                if (alevel < 128) {
                    bits<<=8; len+=8;
                    bits|= level & 0xff;
                } else {
                    bits<<=16; len+=16;
                    bits|= level & 0xff;
                    if (level < 0) {
                        bits|= 0x8001 + level + 255;
                    } else {
                        bits|= level & 0xffff;
                    }
                }
            }

            uni_ac_vlc_len [UNI_AC_ENC_INDEX(run, i)]= len;
        }
    }
}


static int find_frame_rate_index(MpegEncContext *s){
    int i;
    int64_t dmin= INT64_MAX;
    int64_t d;

    for(i=1;i<14;i++) {
        int64_t n0= 1001LL/ff_frame_rate_tab[i].den*ff_frame_rate_tab[i].num*s->avctx->time_base.num;
        int64_t n1= 1001LL*s->avctx->time_base.den;
        if(s->avctx->strict_std_compliance > FF_COMPLIANCE_INOFFICIAL && i>=9) break;

        d = FFABS(n0 - n1);
        if(d < dmin){
            dmin=d;
            s->frame_rate_index= i;
        }
    }
    if(dmin)
        return -1;
    else
        return 0;
}

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static av_cold int encode_init(AVCodecContext *avctx)
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{
    MpegEncContext *s = avctx->priv_data;

    if(MPV_encode_init(avctx) < 0)
        return -1;

    if(find_frame_rate_index(s) < 0){
        if(s->strict_std_compliance > FF_COMPLIANCE_EXPERIMENTAL){
            av_log(avctx, AV_LOG_ERROR, "MPEG1/2 does not support %d/%d fps\n", avctx->time_base.den, avctx->time_base.num);
            return -1;
        }else{
            av_log(avctx, AV_LOG_INFO, "MPEG1/2 does not support %d/%d fps, there may be AV sync issues\n", avctx->time_base.den, avctx->time_base.num);
        }
    }

    if(avctx->profile == FF_PROFILE_UNKNOWN){
        if(avctx->level != FF_LEVEL_UNKNOWN){
            av_log(avctx, AV_LOG_ERROR, "Set profile and level\n");
            return -1;
        }
        avctx->profile = s->chroma_format == CHROMA_420 ? 4 : 0; /* Main or 4:2:2 */
    }

    if(avctx->level == FF_LEVEL_UNKNOWN){
        if(avctx->profile == 0){ /* 4:2:2 */
            if(avctx->width <= 720 && avctx->height <= 608) avctx->level = 5; /* Main */
            else                                            avctx->level = 2; /* High */
        }else{
            if(avctx->profile != 1 && s->chroma_format != CHROMA_420){
                av_log(avctx, AV_LOG_ERROR, "Only High(1) and 4:2:2(0) profiles support 4:2:2 color sampling\n");
                return -1;
            }
            if(avctx->width <= 720 && avctx->height <= 576) avctx->level = 8; /* Main */
            else if(avctx->width <= 1440)                   avctx->level = 6; /* High 1440 */
            else                                            avctx->level = 4; /* High */
        }
    }

    if((avctx->flags2 & CODEC_FLAG2_DROP_FRAME_TIMECODE) && s->frame_rate_index != 4){
        av_log(avctx, AV_LOG_ERROR, "Drop frame time code only allowed with 1001/30000 fps\n");
        return -1;
    }

    return 0;
}

static void put_header(MpegEncContext *s, int header)
{
    align_put_bits(&s->pb);
    put_bits(&s->pb, 16, header>>16);
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    put_sbits(&s->pb, 16, header);
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}

/* put sequence header if needed */
static void mpeg1_encode_sequence_header(MpegEncContext *s)
{
        unsigned int vbv_buffer_size;
        unsigned int fps, v;
        int i;
        uint64_t time_code;
        float best_aspect_error= 1E10;
        float aspect_ratio= av_q2d(s->avctx->sample_aspect_ratio);
        int constraint_parameter_flag;

        if(aspect_ratio==0.0) aspect_ratio= 1.0; //pixel aspect 1:1 (VGA)

        if (s->current_picture.key_frame) {
            AVRational framerate= ff_frame_rate_tab[s->frame_rate_index];

            /* mpeg1 header repeated every gop */
            put_header(s, SEQ_START_CODE);

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            put_sbits(&s->pb, 12, s->width );
            put_sbits(&s->pb, 12, s->height);
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            for(i=1; i<15; i++){
                float error= aspect_ratio;
                if(s->codec_id == CODEC_ID_MPEG1VIDEO || i <=1)
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                    error-= 1.0/ff_mpeg1_aspect[i];
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                else
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                    error-= av_q2d(ff_mpeg2_aspect[i])*s->height/s->width;
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                error= FFABS(error);

                if(error < best_aspect_error){
                    best_aspect_error= error;
                    s->aspect_ratio_info= i;
                }
            }

            put_bits(&s->pb, 4, s->aspect_ratio_info);
            put_bits(&s->pb, 4, s->frame_rate_index);

            if(s->avctx->rc_max_rate){
                v = (s->avctx->rc_max_rate + 399) / 400;
                if (v > 0x3ffff && s->codec_id == CODEC_ID_MPEG1VIDEO)
                    v = 0x3ffff;
            }else{
                v= 0x3FFFF;
            }

            if(s->avctx->rc_buffer_size)
                vbv_buffer_size = s->avctx->rc_buffer_size;
            else
                /* VBV calculation: Scaled so that a VCD has the proper VBV size of 40 kilobytes */
                vbv_buffer_size = (( 20 * s->bit_rate) / (1151929 / 2)) * 8 * 1024;
            vbv_buffer_size= (vbv_buffer_size + 16383) / 16384;

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            put_sbits(&s->pb, 18, v);
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            put_bits(&s->pb, 1, 1); /* marker */
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            put_sbits(&s->pb, 10, vbv_buffer_size);
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            constraint_parameter_flag=
                s->width <= 768 && s->height <= 576 &&
                s->mb_width * s->mb_height <= 396 &&
                s->mb_width * s->mb_height * framerate.num <= framerate.den*396*25 &&
                framerate.num <= framerate.den*30 &&
                s->avctx->me_range && s->avctx->me_range < 128 &&
                vbv_buffer_size <= 20 &&
                v <= 1856000/400 &&
                s->codec_id == CODEC_ID_MPEG1VIDEO;

            put_bits(&s->pb, 1, constraint_parameter_flag);

            ff_write_quant_matrix(&s->pb, s->avctx->intra_matrix);
            ff_write_quant_matrix(&s->pb, s->avctx->inter_matrix);

            if(s->codec_id == CODEC_ID_MPEG2VIDEO){
                put_header(s, EXT_START_CODE);
                put_bits(&s->pb, 4, 1); //seq ext

                put_bits(&s->pb, 1, s->avctx->profile == 0); //escx 1 for 4:2:2 profile */

                put_bits(&s->pb, 3, s->avctx->profile); //profile
                put_bits(&s->pb, 4, s->avctx->level); //level

                put_bits(&s->pb, 1, s->progressive_sequence);
                put_bits(&s->pb, 2, s->chroma_format);
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                put_bits(&s->pb, 2, s->width >>12);
                put_bits(&s->pb, 2, s->height>>12);
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                put_bits(&s->pb, 12, v>>18); //bitrate ext
                put_bits(&s->pb, 1, 1); //marker
                put_bits(&s->pb, 8, vbv_buffer_size >>10); //vbv buffer ext
                put_bits(&s->pb, 1, s->low_delay);
                put_bits(&s->pb, 2, 0); // frame_rate_ext_n
                put_bits(&s->pb, 5, 0); // frame_rate_ext_d
            }

            put_header(s, GOP_START_CODE);
            put_bits(&s->pb, 1, !!(s->avctx->flags2 & CODEC_FLAG2_DROP_FRAME_TIMECODE)); /* drop frame flag */
            /* time code : we must convert from the real frame rate to a
               fake mpeg frame rate in case of low frame rate */
            fps = (framerate.num + framerate.den/2)/ framerate.den;
            time_code = s->current_picture_ptr->coded_picture_number + s->avctx->timecode_frame_start;

            s->gop_picture_number = s->current_picture_ptr->coded_picture_number;
            if (s->avctx->flags2 & CODEC_FLAG2_DROP_FRAME_TIMECODE) {
                /* only works for NTSC 29.97 */
                int d = time_code / 17982;
                int m = time_code % 17982;
                //if (m < 2) m += 2; /* not needed since -2,-1 / 1798 in C returns 0 */
                time_code += 18 * d + 2 * ((m - 2) / 1798);
            }
            put_bits(&s->pb, 5, (uint32_t)((time_code / (fps * 3600)) % 24));
            put_bits(&s->pb, 6, (uint32_t)((time_code / (fps * 60)) % 60));
            put_bits(&s->pb, 1, 1);
            put_bits(&s->pb, 6, (uint32_t)((time_code / fps) % 60));
            put_bits(&s->pb, 6, (uint32_t)((time_code % fps)));
            put_bits(&s->pb, 1, !!(s->flags & CODEC_FLAG_CLOSED_GOP));
            put_bits(&s->pb, 1, 0); /* broken link */
        }
}

static inline void encode_mb_skip_run(MpegEncContext *s, int run){
    while (run >= 33) {
        put_bits(&s->pb, 11, 0x008);
        run -= 33;
    }
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    put_bits(&s->pb, ff_mpeg12_mbAddrIncrTable[run][1],
             ff_mpeg12_mbAddrIncrTable[run][0]);
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}

static av_always_inline void put_qscale(MpegEncContext *s)
{
    if(s->q_scale_type){
        assert(s->qscale>=1 && s->qscale <=12);
        put_bits(&s->pb, 5, inv_non_linear_qscale[s->qscale]);
    }else{
        put_bits(&s->pb, 5, s->qscale);
    }
}

void ff_mpeg1_encode_slice_header(MpegEncContext *s){
    put_header(s, SLICE_MIN_START_CODE + s->mb_y);
    put_qscale(s);
    put_bits(&s->pb, 1, 0); /* slice extra information */
}

void mpeg1_encode_picture_header(MpegEncContext *s, int picture_number)
{
    mpeg1_encode_sequence_header(s);

    /* mpeg1 picture header */
    put_header(s, PICTURE_START_CODE);
    /* temporal reference */

    // RAL: s->picture_number instead of s->fake_picture_number
    put_bits(&s->pb, 10, (s->picture_number -
                          s->gop_picture_number) & 0x3ff);
    put_bits(&s->pb, 3, s->pict_type);

    s->vbv_delay_ptr= s->pb.buf + put_bits_count(&s->pb)/8;
    put_bits(&s->pb, 16, 0xFFFF); /* vbv_delay */

    // RAL: Forward f_code also needed for B frames
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    if (s->pict_type == FF_P_TYPE || s->pict_type == FF_B_TYPE) {
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        put_bits(&s->pb, 1, 0); /* half pel coordinates */
        if(s->codec_id == CODEC_ID_MPEG1VIDEO)
            put_bits(&s->pb, 3, s->f_code); /* forward_f_code */
        else
            put_bits(&s->pb, 3, 7); /* forward_f_code */
    }

    // RAL: Backward f_code necessary for B frames
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    if (s->pict_type == FF_B_TYPE) {
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        put_bits(&s->pb, 1, 0); /* half pel coordinates */
        if(s->codec_id == CODEC_ID_MPEG1VIDEO)
            put_bits(&s->pb, 3, s->b_code); /* backward_f_code */
        else
            put_bits(&s->pb, 3, 7); /* backward_f_code */
    }

    put_bits(&s->pb, 1, 0); /* extra bit picture */

    s->frame_pred_frame_dct = 1;
    if(s->codec_id == CODEC_ID_MPEG2VIDEO){
        put_header(s, EXT_START_CODE);
        put_bits(&s->pb, 4, 8); //pic ext
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        if (s->pict_type == FF_P_TYPE || s->pict_type == FF_B_TYPE) {
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            put_bits(&s->pb, 4, s->f_code);
            put_bits(&s->pb, 4, s->f_code);
        }else{
            put_bits(&s->pb, 8, 255);
        }
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        if (s->pict_type == FF_B_TYPE) {
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            put_bits(&s->pb, 4, s->b_code);
            put_bits(&s->pb, 4, s->b_code);
        }else{
            put_bits(&s->pb, 8, 255);
        }
        put_bits(&s->pb, 2, s->intra_dc_precision);

        assert(s->picture_structure == PICT_FRAME);
        put_bits(&s->pb, 2, s->picture_structure);
        if (s->progressive_sequence) {
            put_bits(&s->pb, 1, 0); /* no repeat */
        } else {
            put_bits(&s->pb, 1, s->current_picture_ptr->top_field_first);
        }
        /* XXX: optimize the generation of this flag with entropy
           measures */
        s->frame_pred_frame_dct = s->progressive_sequence;

        put_bits(&s->pb, 1, s->frame_pred_frame_dct);
        put_bits(&s->pb, 1, s->concealment_motion_vectors);
        put_bits(&s->pb, 1, s->q_scale_type);
        put_bits(&s->pb, 1, s->intra_vlc_format);
        put_bits(&s->pb, 1, s->alternate_scan);
        put_bits(&s->pb, 1, s->repeat_first_field);
        s->progressive_frame = s->progressive_sequence;
        put_bits(&s->pb, 1, s->chroma_format == CHROMA_420 ? s->progressive_frame : 0); /* chroma_420_type */
        put_bits(&s->pb, 1, s->progressive_frame);
        put_bits(&s->pb, 1, 0); //composite_display_flag
    }
    if(s->flags & CODEC_FLAG_SVCD_SCAN_OFFSET){
        int i;

        put_header(s, USER_START_CODE);
        for(i=0; i<sizeof(svcd_scan_offset_placeholder); i++){
            put_bits(&s->pb, 8, svcd_scan_offset_placeholder[i]);
        }
    }

    s->mb_y=0;
    ff_mpeg1_encode_slice_header(s);
}

static inline void put_mb_modes(MpegEncContext *s, int n, int bits,
                                int has_mv, int field_motion)
{
    put_bits(&s->pb, n, bits);
    if (!s->frame_pred_frame_dct) {
        if (has_mv)
            put_bits(&s->pb, 2, 2 - field_motion); /* motion_type: frame/field */
        put_bits(&s->pb, 1, s->interlaced_dct);
    }
}

static av_always_inline void mpeg1_encode_mb_internal(MpegEncContext *s,
                                                   DCTELEM block[6][64],
                                                   int motion_x, int motion_y,
                                                   int mb_block_count)
{
    int i, cbp;
    const int mb_x = s->mb_x;
    const int mb_y = s->mb_y;
    const int first_mb= mb_x == s->resync_mb_x && mb_y == s->resync_mb_y;

    /* compute cbp */
    cbp = 0;
    for(i=0;i<mb_block_count;i++) {
        if (s->block_last_index[i] >= 0)
            cbp |= 1 << (mb_block_count - 1 - i);
    }

    if (cbp == 0 && !first_mb && s->mv_type == MV_TYPE_16X16 &&
        (mb_x != s->mb_width - 1 || (mb_y != s->mb_height - 1 && s->codec_id == CODEC_ID_MPEG1VIDEO)) &&
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        ((s->pict_type == FF_P_TYPE && (motion_x | motion_y) == 0) ||
        (s->pict_type == FF_B_TYPE && s->mv_dir == s->last_mv_dir && (((s->mv_dir & MV_DIR_FORWARD) ? ((s->mv[0][0][0] - s->last_mv[0][0][0])|(s->mv[0][0][1] - s->last_mv[0][0][1])) : 0) |
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        ((s->mv_dir & MV_DIR_BACKWARD) ? ((s->mv[1][0][0] - s->last_mv[1][0][0])|(s->mv[1][0][1] - s->last_mv[1][0][1])) : 0)) == 0))) {
        s->mb_skip_run++;
        s->qscale -= s->dquant;
        s->skip_count++;
        s->misc_bits++;
        s->last_bits++;
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        if(s->pict_type == FF_P_TYPE){
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            s->last_mv[0][1][0]= s->last_mv[0][0][0]=
            s->last_mv[0][1][1]= s->last_mv[0][0][1]= 0;
        }
    } else {
        if(first_mb){
            assert(s->mb_skip_run == 0);
            encode_mb_skip_run(s, s->mb_x);
        }else{
            encode_mb_skip_run(s, s->mb_skip_run);
        }

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        if (s->pict_type == FF_I_TYPE) {
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            if(s->dquant && cbp){
                put_mb_modes(s, 2, 1, 0, 0); /* macroblock_type : macroblock_quant = 1 */
                put_qscale(s);
            }else{
                put_mb_modes(s, 1, 1, 0, 0); /* macroblock_type : macroblock_quant = 0 */
                s->qscale -= s->dquant;
            }
            s->misc_bits+= get_bits_diff(s);
            s->i_count++;
        } else if (s->mb_intra) {
            if(s->dquant && cbp){
                put_mb_modes(s, 6, 0x01, 0, 0);
                put_qscale(s);
            }else{
                put_mb_modes(s, 5, 0x03, 0, 0);
                s->qscale -= s->dquant;
            }
            s->misc_bits+= get_bits_diff(s);
            s->i_count++;
            memset(s->last_mv, 0, sizeof(s->last_mv));
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        } else if (s->pict_type == FF_P_TYPE) {
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            if(s->mv_type == MV_TYPE_16X16){
                if (cbp != 0) {
                    if ((motion_x|motion_y) == 0) {
                        if(s->dquant){
                            put_mb_modes(s, 5, 1, 0, 0); /* macroblock_pattern & quant */
                            put_qscale(s);
                        }else{
                            put_mb_modes(s, 2, 1, 0, 0); /* macroblock_pattern only */
                        }
                        s->misc_bits+= get_bits_diff(s);
                    } else {
                        if(s->dquant){
                            put_mb_modes(s, 5, 2, 1, 0); /* motion + cbp */
                            put_qscale(s);
                        }else{
                            put_mb_modes(s, 1, 1, 1, 0); /* motion + cbp */
                        }
                        s->misc_bits+= get_bits_diff(s);
                        mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code);    // RAL: f_code parameter added
                        mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code);    // RAL: f_code parameter added
                        s->mv_bits+= get_bits_diff(s);
                    }
                } else {
                    put_bits(&s->pb, 3, 1); /* motion only */
                    if (!s->frame_pred_frame_dct)
                        put_bits(&s->pb, 2, 2); /* motion_type: frame */
                    s->misc_bits+= get_bits_diff(s);
                    mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code);    // RAL: f_code parameter added
                    mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code);    // RAL: f_code parameter added
                    s->qscale -= s->dquant;
                    s->mv_bits+= get_bits_diff(s);
                }
                s->last_mv[0][1][0]= s->last_mv[0][0][0]= motion_x;
                s->last_mv[0][1][1]= s->last_mv[0][0][1]= motion_y;
            }else{
                assert(!s->frame_pred_frame_dct && s->mv_type == MV_TYPE_FIELD);

                if (cbp) {
                    if(s->dquant){
                        put_mb_modes(s, 5, 2, 1, 1); /* motion + cbp */
                        put_qscale(s);
                    }else{
                        put_mb_modes(s, 1, 1, 1, 1); /* motion + cbp */
                    }
                } else {
                    put_bits(&s->pb, 3, 1); /* motion only */
                    put_bits(&s->pb, 2, 1); /* motion_type: field */
                    s->qscale -= s->dquant;
                }
                s->misc_bits+= get_bits_diff(s);
                for(i=0; i<2; i++){
                    put_bits(&s->pb, 1, s->field_select[0][i]);
                    mpeg1_encode_motion(s, s->mv[0][i][0] -  s->last_mv[0][i][0]    , s->f_code);
                    mpeg1_encode_motion(s, s->mv[0][i][1] - (s->last_mv[0][i][1]>>1), s->f_code);
                    s->last_mv[0][i][0]=   s->mv[0][i][0];
                    s->last_mv[0][i][1]= 2*s->mv[0][i][1];
                }
                s->mv_bits+= get_bits_diff(s);
            }
            if(cbp) {
                if (s->chroma_y_shift) {
557
                    put_bits(&s->pb, ff_mpeg12_mbPatTable[cbp][1], ff_mpeg12_mbPatTable[cbp][0]);
558
                } else {
559
                    put_bits(&s->pb, ff_mpeg12_mbPatTable[cbp>>2][1], ff_mpeg12_mbPatTable[cbp>>2][0]);
560
                    put_sbits(&s->pb, 2, cbp);
561 562 563 564 565 566 567 568 569 570
                }
            }
            s->f_count++;
        } else{
            if(s->mv_type == MV_TYPE_16X16){
                if (cbp){    // With coded bloc pattern
                    if (s->dquant) {
                        if(s->mv_dir == MV_DIR_FORWARD)
                            put_mb_modes(s, 6, 3, 1, 0);
                        else
571
                            put_mb_modes(s, 8-s->mv_dir, 2, 1, 0);
572 573
                        put_qscale(s);
                    } else {
574
                        put_mb_modes(s, 5-s->mv_dir, 3, 1, 0);
575 576
                    }
                }else{    // No coded bloc pattern
577
                    put_bits(&s->pb, 5-s->mv_dir, 2);
578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604
                    if (!s->frame_pred_frame_dct)
                        put_bits(&s->pb, 2, 2); /* motion_type: frame */
                    s->qscale -= s->dquant;
                }
                s->misc_bits += get_bits_diff(s);
                if (s->mv_dir&MV_DIR_FORWARD){
                    mpeg1_encode_motion(s, s->mv[0][0][0] - s->last_mv[0][0][0], s->f_code);
                    mpeg1_encode_motion(s, s->mv[0][0][1] - s->last_mv[0][0][1], s->f_code);
                    s->last_mv[0][0][0]=s->last_mv[0][1][0]= s->mv[0][0][0];
                    s->last_mv[0][0][1]=s->last_mv[0][1][1]= s->mv[0][0][1];
                    s->f_count++;
                }
                if (s->mv_dir&MV_DIR_BACKWARD){
                    mpeg1_encode_motion(s, s->mv[1][0][0] - s->last_mv[1][0][0], s->b_code);
                    mpeg1_encode_motion(s, s->mv[1][0][1] - s->last_mv[1][0][1], s->b_code);
                    s->last_mv[1][0][0]=s->last_mv[1][1][0]= s->mv[1][0][0];
                    s->last_mv[1][0][1]=s->last_mv[1][1][1]= s->mv[1][0][1];
                    s->b_count++;
                }
            }else{
                assert(s->mv_type == MV_TYPE_FIELD);
                assert(!s->frame_pred_frame_dct);
                if (cbp){    // With coded bloc pattern
                    if (s->dquant) {
                        if(s->mv_dir == MV_DIR_FORWARD)
                            put_mb_modes(s, 6, 3, 1, 1);
                        else
605
                            put_mb_modes(s, 8-s->mv_dir, 2, 1, 1);
606 607
                        put_qscale(s);
                    } else {
608
                        put_mb_modes(s, 5-s->mv_dir, 3, 1, 1);
609 610
                    }
                }else{    // No coded bloc pattern
611
                    put_bits(&s->pb, 5-s->mv_dir, 2);
612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639
                    put_bits(&s->pb, 2, 1); /* motion_type: field */
                    s->qscale -= s->dquant;
                }
                s->misc_bits += get_bits_diff(s);
                if (s->mv_dir&MV_DIR_FORWARD){
                    for(i=0; i<2; i++){
                        put_bits(&s->pb, 1, s->field_select[0][i]);
                        mpeg1_encode_motion(s, s->mv[0][i][0] -  s->last_mv[0][i][0]    , s->f_code);
                        mpeg1_encode_motion(s, s->mv[0][i][1] - (s->last_mv[0][i][1]>>1), s->f_code);
                        s->last_mv[0][i][0]=   s->mv[0][i][0];
                        s->last_mv[0][i][1]= 2*s->mv[0][i][1];
                    }
                    s->f_count++;
                }
                if (s->mv_dir&MV_DIR_BACKWARD){
                    for(i=0; i<2; i++){
                        put_bits(&s->pb, 1, s->field_select[1][i]);
                        mpeg1_encode_motion(s, s->mv[1][i][0] -  s->last_mv[1][i][0]    , s->b_code);
                        mpeg1_encode_motion(s, s->mv[1][i][1] - (s->last_mv[1][i][1]>>1), s->b_code);
                        s->last_mv[1][i][0]=   s->mv[1][i][0];
                        s->last_mv[1][i][1]= 2*s->mv[1][i][1];
                    }
                    s->b_count++;
                }
            }
            s->mv_bits += get_bits_diff(s);
            if(cbp) {
                if (s->chroma_y_shift) {
640
                    put_bits(&s->pb, ff_mpeg12_mbPatTable[cbp][1], ff_mpeg12_mbPatTable[cbp][0]);
641
                } else {
642
                    put_bits(&s->pb, ff_mpeg12_mbPatTable[cbp>>2][1], ff_mpeg12_mbPatTable[cbp>>2][0]);
643
                    put_sbits(&s->pb, 2, cbp);
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                }
            }
        }
        for(i=0;i<mb_block_count;i++) {
            if (cbp & (1 << (mb_block_count - 1 - i))) {
                mpeg1_encode_block(s, block[i], i);
            }
        }
        s->mb_skip_run = 0;
        if(s->mb_intra)
            s->i_tex_bits+= get_bits_diff(s);
        else
            s->p_tex_bits+= get_bits_diff(s);
    }
}

void mpeg1_encode_mb(MpegEncContext *s, DCTELEM block[6][64], int motion_x, int motion_y)
{
    if (s->chroma_format == CHROMA_420) mpeg1_encode_mb_internal(s, block, motion_x, motion_y, 6);
    else                                mpeg1_encode_mb_internal(s, block, motion_x, motion_y, 8);
}

// RAL: Parameter added: f_or_b_code
static void mpeg1_encode_motion(MpegEncContext *s, int val, int f_or_b_code)
{
    int code, bit_size, l, bits, range, sign;

    if (val == 0) {
        /* zero vector */
        code = 0;
        put_bits(&s->pb,
675 676
                 ff_mpeg12_mbMotionVectorTable[0][1],
                 ff_mpeg12_mbMotionVectorTable[0][0]);
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    } else {
        bit_size = f_or_b_code - 1;
        range = 1 << bit_size;
        /* modulo encoding */
        l= INT_BIT - 5 - bit_size;
        val= (val<<l)>>l;

        if (val >= 0) {
            val--;
            code = (val >> bit_size) + 1;
            bits = val & (range - 1);
            sign = 0;
        } else {
            val = -val;
            val--;
            code = (val >> bit_size) + 1;
            bits = val & (range - 1);
            sign = 1;
        }

        assert(code > 0 && code <= 16);

        put_bits(&s->pb,
700 701
                 ff_mpeg12_mbMotionVectorTable[code][1],
                 ff_mpeg12_mbMotionVectorTable[code][0]);
702 703 704 705 706 707 708 709 710 711 712 713

        put_bits(&s->pb, 1, sign);
        if (bit_size > 0) {
            put_bits(&s->pb, bit_size, bits);
        }
    }
}

void ff_mpeg1_encode_init(MpegEncContext *s)
{
    static int done=0;

714
    ff_mpeg12_common_init(s);
715 716 717 718 719 720 721

    if(!done){
        int f_code;
        int mv;
        int i;

        done=1;
722 723
        init_rl(&ff_rl_mpeg1, ff_mpeg12_static_rl_table_store[0]);
        init_rl(&ff_rl_mpeg2, ff_mpeg12_static_rl_table_store[1]);
724 725 726

        for(i=0; i<64; i++)
        {
727 728
                mpeg1_max_level[0][i]= ff_rl_mpeg1.max_level[0][i];
                mpeg1_index_run[0][i]= ff_rl_mpeg1.index_run[0][i];
729 730
        }

731
        init_uni_ac_vlc(&ff_rl_mpeg1, uni_mpeg1_ac_vlc_len);
732
        if(s->intra_vlc_format)
733
            init_uni_ac_vlc(&ff_rl_mpeg2, uni_mpeg2_ac_vlc_len);
734 735 736 737 738 739 740 741 742 743 744 745

        /* build unified dc encoding tables */
        for(i=-255; i<256; i++)
        {
                int adiff, index;
                int bits, code;
                int diff=i;

                adiff = FFABS(diff);
                if(diff<0) diff--;
                index = av_log2(2*adiff);

746 747
                bits= ff_mpeg12_vlc_dc_lum_bits[index] + index;
                code= (ff_mpeg12_vlc_dc_lum_code[index]<<index) + (diff & ((1 << index) - 1));
748 749
                mpeg1_lum_dc_uni[i+255]= bits + (code<<8);

750 751
                bits= ff_mpeg12_vlc_dc_chroma_bits[index] + index;
                code= (ff_mpeg12_vlc_dc_chroma_code[index]<<index) + (diff & ((1 << index) - 1));
752 753 754 755 756 757 758
                mpeg1_chr_dc_uni[i+255]= bits + (code<<8);
        }

        for(f_code=1; f_code<=MAX_FCODE; f_code++){
            for(mv=-MAX_MV; mv<=MAX_MV; mv++){
                int len;

759
                if(mv==0) len= ff_mpeg12_mbMotionVectorTable[0][1];
760 761 762 763 764 765 766 767 768 769 770 771
                else{
                    int val, bit_size, range, code;

                    bit_size = f_code - 1;
                    range = 1 << bit_size;

                    val=mv;
                    if (val < 0)
                        val = -val;
                    val--;
                    code = (val >> bit_size) + 1;
                    if(code<17){
772
                        len= ff_mpeg12_mbMotionVectorTable[code][1] + 1 + bit_size;
773
                    }else{
774
                        len= ff_mpeg12_mbMotionVectorTable[16][1] + 2 + bit_size;
775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822
                    }
                }

                mv_penalty[f_code][mv+MAX_MV]= len;
            }
        }


        for(f_code=MAX_FCODE; f_code>0; f_code--){
            for(mv=-(8<<f_code); mv<(8<<f_code); mv++){
                fcode_tab[mv+MAX_MV]= f_code;
            }
        }
    }
    s->me.mv_penalty= mv_penalty;
    s->fcode_tab= fcode_tab;
    if(s->codec_id == CODEC_ID_MPEG1VIDEO){
        s->min_qcoeff=-255;
        s->max_qcoeff= 255;
    }else{
        s->min_qcoeff=-2047;
        s->max_qcoeff= 2047;
    }
    if (s->intra_vlc_format) {
        s->intra_ac_vlc_length=
        s->intra_ac_vlc_last_length= uni_mpeg2_ac_vlc_len;
    } else {
        s->intra_ac_vlc_length=
        s->intra_ac_vlc_last_length= uni_mpeg1_ac_vlc_len;
    }
    s->inter_ac_vlc_length=
    s->inter_ac_vlc_last_length= uni_mpeg1_ac_vlc_len;
}

static inline void encode_dc(MpegEncContext *s, int diff, int component)
{
  if(((unsigned) (diff+255)) >= 511){
        int index;

        if(diff<0){
            index= av_log2_16bit(-2*diff);
            diff--;
        }else{
            index= av_log2_16bit(2*diff);
        }
        if (component == 0) {
            put_bits(
                &s->pb,
823 824
                ff_mpeg12_vlc_dc_lum_bits[index] + index,
                (ff_mpeg12_vlc_dc_lum_code[index]<<index) + (diff & ((1 << index) - 1)));
825 826 827
        }else{
            put_bits(
                &s->pb,
828 829
                ff_mpeg12_vlc_dc_chroma_bits[index] + index,
                (ff_mpeg12_vlc_dc_chroma_code[index]<<index) + (diff & ((1 << index) - 1)));
830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851
        }
  }else{
    if (component == 0) {
        put_bits(
            &s->pb,
            mpeg1_lum_dc_uni[diff+255]&0xFF,
            mpeg1_lum_dc_uni[diff+255]>>8);
    } else {
        put_bits(
            &s->pb,
            mpeg1_chr_dc_uni[diff+255]&0xFF,
            mpeg1_chr_dc_uni[diff+255]>>8);
    }
  }
}

static void mpeg1_encode_block(MpegEncContext *s,
                               DCTELEM *block,
                               int n)
{
    int alevel, level, last_non_zero, dc, diff, i, j, run, last_index, sign;
    int code, component;
852
    const uint16_t (*table_vlc)[2] = ff_rl_mpeg1.table_vlc;
853 854 855 856 857 858 859 860 861 862 863 864

    last_index = s->block_last_index[n];

    /* DC coef */
    if (s->mb_intra) {
        component = (n <= 3 ? 0 : (n&1) + 1);
        dc = block[0]; /* overflow is impossible */
        diff = dc - s->last_dc[component];
        encode_dc(s, diff, component);
        s->last_dc[component] = dc;
        i = 1;
        if (s->intra_vlc_format)
865
            table_vlc = ff_rl_mpeg2.table_vlc;
866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910
    } else {
        /* encode the first coefficient : needs to be done here because
           it is handled slightly differently */
        level = block[0];
        if (abs(level) == 1) {
                code = ((uint32_t)level >> 31); /* the sign bit */
                put_bits(&s->pb, 2, code | 0x02);
                i = 1;
        } else {
            i = 0;
            last_non_zero = -1;
            goto next_coef;
        }
    }

    /* now quantify & encode AC coefs */
    last_non_zero = i - 1;

    for(;i<=last_index;i++) {
        j = s->intra_scantable.permutated[i];
        level = block[j];
    next_coef:
#if 0
        if (level != 0)
            dprintf(s->avctx, "level[%d]=%d\n", i, level);
#endif
        /* encode using VLC */
        if (level != 0) {
            run = i - last_non_zero - 1;

            alevel= level;
            MASK_ABS(sign, alevel)
            sign&=1;

            if (alevel <= mpeg1_max_level[0][run]){
                code= mpeg1_index_run[0][run] + alevel - 1;
                /* store the vlc & sign at once */
                put_bits(&s->pb, table_vlc[code][1]+1, (table_vlc[code][0]<<1) + sign);
            } else {
                /* escape seems to be pretty rare <5% so I do not optimize it */
                put_bits(&s->pb, table_vlc[111][1], table_vlc[111][0]);
                /* escape: only clip in this case */
                put_bits(&s->pb, 6, run);
                if(s->codec_id == CODEC_ID_MPEG1VIDEO){
                    if (alevel < 128) {
911
                        put_sbits(&s->pb, 8, level);
912 913 914 915
                    } else {
                        if (level < 0) {
                            put_bits(&s->pb, 16, 0x8001 + level + 255);
                        } else {
916
                            put_sbits(&s->pb, 16, level);
917 918 919
                        }
                    }
                }else{
920
                    put_sbits(&s->pb, 12, level);
921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938
                }
            }
            last_non_zero = i;
        }
    }
    /* end of block */
    put_bits(&s->pb, table_vlc[112][1], table_vlc[112][0]);
}

AVCodec mpeg1video_encoder = {
    "mpeg1video",
    CODEC_TYPE_VIDEO,
    CODEC_ID_MPEG1VIDEO,
    sizeof(MpegEncContext),
    encode_init,
    MPV_encode_picture,
    MPV_encode_end,
    .supported_framerates= ff_frame_rate_tab+1,
939
    .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_NONE},
940
    .capabilities= CODEC_CAP_DELAY,
941
    .long_name= NULL_IF_CONFIG_SMALL("MPEG-1 video"),
942 943 944 945 946 947 948 949 950 951 952
};

AVCodec mpeg2video_encoder = {
    "mpeg2video",
    CODEC_TYPE_VIDEO,
    CODEC_ID_MPEG2VIDEO,
    sizeof(MpegEncContext),
    encode_init,
    MPV_encode_picture,
    MPV_encode_end,
    .supported_framerates= ff_frame_rate_tab+1,
953
    .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_YUV422P, PIX_FMT_NONE},
954
    .capabilities= CODEC_CAP_DELAY,
955
    .long_name= NULL_IF_CONFIG_SMALL("MPEG-2 video"),
956
};