split mpeg12 encoder out of mpeg12.c

Originally committed as revision 9477 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 956 insertions, 0 deletions

diff --git a/libavcodec/mpeg12enc.c b/libavcodec/mpeg12enc.c
new file mode 100644
index 0000000000..8afaf0a6d0
--- /dev/null
+++ b/libavcodec/mpeg12enc.c
@@ -0,0 +1,956 @@
+/*
+ * 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;
+}
+
+static int encode_init(AVCodecContext *avctx)
+{
+    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);
+    put_bits(&s->pb, 16, header&0xFFFF);
+}
+
+/* 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);
+
+            put_bits(&s->pb, 12, s->width);
+            put_bits(&s->pb, 12, s->height);
+
+            for(i=1; i<15; i++){
+                float error= aspect_ratio;
+                if(s->codec_id == CODEC_ID_MPEG1VIDEO || i <=1)
+                    error-= 1.0/mpeg1_aspect[i];
+                else
+                    error-= av_q2d(mpeg2_aspect[i])*s->height/s->width;
+
+                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;
+
+            put_bits(&s->pb, 18, v & 0x3FFFF);
+            put_bits(&s->pb, 1, 1); /* marker */
+            put_bits(&s->pb, 10, vbv_buffer_size & 0x3FF);
+
+            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);
+                put_bits(&s->pb, 2, 0); //horizontal size ext
+                put_bits(&s->pb, 2, 0); //vertical size ext
+                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;
+    }
+    put_bits(&s->pb, mbAddrIncrTable[run][1],
+             mbAddrIncrTable[run][0]);
+}
+
+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
+    if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) {
+        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
+    if (s->pict_type == B_TYPE) {
+        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
+        if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) {
+            put_bits(&s->pb, 4, s->f_code);
+            put_bits(&s->pb, 4, s->f_code);
+        }else{
+            put_bits(&s->pb, 8, 255);
+        }
+        if (s->pict_type == B_TYPE) {
+            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)) &&
+        ((s->pict_type == P_TYPE && (motion_x | motion_y) == 0) ||
+        (s->pict_type == 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) |
+        ((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++;
+        if(s->pict_type == P_TYPE){
+            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);
+        }
+
+        if (s->pict_type == I_TYPE) {
+            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));
+        } else if (s->pict_type == P_TYPE) {
+            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) {
+                    put_bits(&s->pb, mbPatTable[cbp][1], mbPatTable[cbp][0]);
+                } else {
+                    put_bits(&s->pb, mbPatTable[cbp>>2][1], mbPatTable[cbp>>2][0]);
+                    put_bits(&s->pb, 2, cbp & 3);
+                }
+            }
+            s->f_count++;
+        } else{
+            static const int mb_type_len[4]={0,3,4,2}; //bak,for,bi
+
+            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
+                            put_mb_modes(s, mb_type_len[s->mv_dir]+3, 2, 1, 0);
+                        put_qscale(s);
+                    } else {
+                        put_mb_modes(s, mb_type_len[s->mv_dir], 3, 1, 0);
+                    }
+                }else{    // No coded bloc pattern
+                    put_bits(&s->pb, mb_type_len[s->mv_dir], 2);
+                    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
+                            put_mb_modes(s, mb_type_len[s->mv_dir]+3, 2, 1, 1);
+                        put_qscale(s);
+                    } else {
+                        put_mb_modes(s, mb_type_len[s->mv_dir], 3, 1, 1);
+                    }
+                }else{    // No coded bloc pattern
+                    put_bits(&s->pb, mb_type_len[s->mv_dir], 2);
+                    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) {
+                    put_bits(&s->pb, mbPatTable[cbp][1], mbPatTable[cbp][0]);
+                } else {
+                    put_bits(&s->pb, mbPatTable[cbp>>2][1], mbPatTable[cbp>>2][0]);
+                    put_bits(&s->pb, 2, cbp & 3);
+                }
+            }
+        }
+        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,
+                 mbMotionVectorTable[0][1],
+                 mbMotionVectorTable[0][0]);
+    } 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,
+                 mbMotionVectorTable[code][1],
+                 mbMotionVectorTable[code][0]);
+
+        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;
+
+    common_init(s);
+
+    if(!done){
+        int f_code;
+        int mv;
+        int i;
+
+        done=1;
+        init_rl(&rl_mpeg1, static_rl_table_store[0]);
+        init_rl(&rl_mpeg2, static_rl_table_store[1]);
+
+        for(i=0; i<64; i++)
+        {
+                mpeg1_max_level[0][i]= rl_mpeg1.max_level[0][i];
+                mpeg1_index_run[0][i]= rl_mpeg1.index_run[0][i];
+        }
+
+        init_uni_ac_vlc(&rl_mpeg1, uni_mpeg1_ac_vlc_len);
+        if(s->intra_vlc_format)
+            init_uni_ac_vlc(&rl_mpeg2, uni_mpeg2_ac_vlc_len);
+
+        /* 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);
+
+                bits= vlc_dc_lum_bits[index] + index;
+                code= (vlc_dc_lum_code[index]<<index) + (diff & ((1 << index) - 1));
+                mpeg1_lum_dc_uni[i+255]= bits + (code<<8);
+
+                bits= vlc_dc_chroma_bits[index] + index;
+                code= (vlc_dc_chroma_code[index]<<index) + (diff & ((1 << index) - 1));
+                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;
+
+                if(mv==0) len= mbMotionVectorTable[0][1];
+                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){
+                        len= mbMotionVectorTable[code][1] + 1 + bit_size;
+                    }else{
+                        len= mbMotionVectorTable[16][1] + 2 + bit_size;
+                    }
+                }
+
+                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,
+                vlc_dc_lum_bits[index] + index,
+                (vlc_dc_lum_code[index]<<index) + (diff & ((1 << index) - 1)));
+        }else{
+            put_bits(
+                &s->pb,
+                vlc_dc_chroma_bits[index] + index,
+                (vlc_dc_chroma_code[index]<<index) + (diff & ((1 << index) - 1)));
+        }
+  }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;
+    const uint16_t (*table_vlc)[2] = rl_mpeg1.table_vlc;
+
+    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)
+            table_vlc = rl_mpeg2.table_vlc;
+    } 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) {
+                        put_bits(&s->pb, 8, level & 0xff);
+                    } else {
+                        if (level < 0) {
+                            put_bits(&s->pb, 16, 0x8001 + level + 255);
+                        } else {
+                            put_bits(&s->pb, 16, level & 0xffff);
+                        }
+                    }
+                }else{
+                    put_bits(&s->pb, 12, level & 0xfff);
+                }
+            }
+            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,
+    .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV420P, -1},
+    .capabilities= CODEC_CAP_DELAY,
+};
+
+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,
+    .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_YUV422P, -1},
+    .capabilities= CODEC_CAP_DELAY,
+};