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mpeg1 bframe encoding patch by (Raphaël LEGRAND) with some modifications by me

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Originally committed as revision 1551 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2003-02-08 12:00:57 +00:00
parent 27efd8467a
commit 63b15e559a
5 changed files with 195 additions and 53 deletions
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4
ffmpeg.c
View File

@ -2234,10 +2234,6 @@ void opt_output_file(const char *filename)
if (b_frames) {
if (codec_id != CODEC_ID_MPEG4) {
fprintf(stderr, "\nB frames encoding only supported by MPEG-4.\n");
exit(1);
}
video_enc->max_b_frames = b_frames;
video_enc->b_frame_strategy = 0;
video_enc->b_quant_factor = 2.0;

40
libavcodec/motion_est.c
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@ -1493,12 +1493,13 @@ void ff_estimate_b_frame_motion(MpegEncContext * s,
fbmin= bidir_refine(s, mb_x, mb_y) + penalty_factor;
//printf("%d %d %d %d\n", dmin, fmin, bmin, fbmin);
{
int score= dmin;
type=MB_TYPE_DIRECT;
if(fmin<score){
score=fmin;
int score= fmin;
type = MB_TYPE_FORWARD;
// RAL: No MB_TYPE_DIRECT in MPEG-1 video (only MPEG-4)
if (s->codec_id != CODEC_ID_MPEG1VIDEO && dmin <= score){
score = dmin;
type = MB_TYPE_DIRECT;
}
if(bmin<score){
score=bmin;
@ -1643,21 +1644,32 @@ void ff_fix_long_b_mvs(MpegEncContext * s, int16_t (*mv_table)[2], int f_code, i
int y;
UINT8 * fcode_tab= s->fcode_tab;
// RAL: 8 in MPEG-1, 16 in MPEG-4
int range = (((s->codec_id == CODEC_ID_MPEG1VIDEO) ? 8 : 16) << f_code);
/* clip / convert to intra 16x16 type MVs */
for(y=0; y<s->mb_height; y++){
int x;
int xy= (y+1)* (s->mb_width+2)+1;
int i= y*s->mb_width;
for(x=0; x<s->mb_width; x++){
if( fcode_tab[mv_table[xy][0] + MAX_MV] > f_code
|| fcode_tab[mv_table[xy][0] + MAX_MV] == 0){
if(mv_table[xy][0]>0) mv_table[xy][0]= (16<<f_code)-1;
else mv_table[xy][0]= -(16<<f_code);
for(x=0; x<s->mb_width; x++)
{
if (s->mb_type[i] & type) // RAL: "type" test added...
{
if (fcode_tab[mv_table[xy][0] + MAX_MV] > f_code || fcode_tab[mv_table[xy][0] + MAX_MV] == 0)
{
if(mv_table[xy][0]>0)
mv_table[xy][0]= range-1;
else
mv_table[xy][0]= -range;
}
if (fcode_tab[mv_table[xy][1] + MAX_MV] > f_code || fcode_tab[mv_table[xy][1] + MAX_MV] == 0)
{
if(mv_table[xy][1]>0)
mv_table[xy][1]= range-1;
else
mv_table[xy][1]= -range;
}
if( fcode_tab[mv_table[xy][1] + MAX_MV] > f_code
|| fcode_tab[mv_table[xy][1] + MAX_MV] == 0){
if(mv_table[xy][1]>0) mv_table[xy][1]= (16<<f_code)-1;
else mv_table[xy][1]= -(16<<f_code);
}
xy++;
i++;

147
libavcodec/mpeg12.c
View File

@ -50,7 +50,7 @@
static void mpeg1_encode_block(MpegEncContext *s,
DCTELEM *block,
int component);
static void mpeg1_encode_motion(MpegEncContext *s, int val);
static void mpeg1_encode_motion(MpegEncContext *s, int val, int f_or_b_code); // RAL: f_code parameter added
static void mpeg1_skip_picture(MpegEncContext *s, int pict_num);
static inline int mpeg1_decode_block_inter(MpegEncContext *s,
DCTELEM *block,
@ -332,18 +332,27 @@ void mpeg1_encode_picture_header(MpegEncContext *s, int picture_number)
/* mpeg1 picture header */
put_header(s, PICTURE_START_CODE);
/* temporal reference */
put_bits(&s->pb, 10, (s->fake_picture_number -
// RAL: s->picture_number instead of s->fake_picture_number
put_bits(&s->pb, 10, (s->picture_number -
s->gop_picture_number) & 0x3ff);
s->fake_picture_number++;
put_bits(&s->pb, 3, s->pict_type);
put_bits(&s->pb, 16, 0xffff); /* non constant bit rate */
if (s->pict_type == P_TYPE) {
// 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 */
put_bits(&s->pb, 3, s->f_code); /* 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 */
put_bits(&s->pb, 3, s->b_code); /* backward_f_code */
}
put_bits(&s->pb, 1, 0); /* extra bit picture */
/* only one slice */
@ -368,10 +377,11 @@ void mpeg1_encode_mb(MpegEncContext *s,
cbp |= 1 << (5 - i);
}
/* skip macroblock, except if first or last macroblock of a slice */
if ((cbp | motion_x | motion_y) == 0 &&
(!((mb_x | mb_y) == 0 ||
(mb_x == s->mb_width - 1 && mb_y == s->mb_height - 1)))) {
// RAL: Skipped macroblocks for B frames...
if (cbp == 0 && (!((mb_x | mb_y) == 0 || (mb_x == s->mb_width - 1 && mb_y == s->mb_height - 1))) &&
((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_incr++;
s->qscale -= s->dquant;
s->skip_count++;
@ -398,8 +408,7 @@ void mpeg1_encode_mb(MpegEncContext *s,
}
s->misc_bits+= get_bits_diff(s);
s->i_count++;
} else {
if (s->mb_intra) {
} else if (s->mb_intra) {
if(s->dquant && cbp){
put_bits(&s->pb, 6, 0x01);
put_bits(&s->pb, 5, s->qscale);
@ -409,7 +418,9 @@ void mpeg1_encode_mb(MpegEncContext *s,
}
s->misc_bits+= get_bits_diff(s);
s->i_count++;
} else {
s->last_mv[0][0][0] =
s->last_mv[0][0][1] = 0;
} else if (s->pict_type == P_TYPE) {
if (cbp != 0) {
if (motion_x == 0 && motion_y == 0) {
if(s->dquant){
@ -428,20 +439,105 @@ void mpeg1_encode_mb(MpegEncContext *s,
put_bits(&s->pb, 1, 1); /* motion + cbp */
}
s->misc_bits+= get_bits_diff(s);
mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0]);
mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1]);
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);
put_bits(&s->pb, mbPatTable[cbp - 1][1], mbPatTable[cbp - 1][0]);
}
} else {
put_bits(&s->pb, 3, 1); /* motion only */
mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0]);
mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1]);
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->f_count++;
} else
{ // RAL: All the following bloc added for B frames:
if (cbp != 0)
{ // With coded bloc pattern
if (s->mv_dir == (MV_DIR_FORWARD | MV_DIR_BACKWARD))
{ // Bi-directional motion
if (s->dquant)
{ // With QScale
put_bits(&s->pb, 5, 2);
put_bits(&s->pb, 5, s->qscale);
}
else // Without QScale
put_bits(&s->pb, 2, 3);
s->misc_bits += get_bits_diff(s);
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);
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->b_count++;
s->f_count++;
s->mv_bits += get_bits_diff(s);
put_bits(&s->pb, mbPatTable[cbp - 1][1], mbPatTable[cbp - 1][0]);
}
else if (s->mv_dir == MV_DIR_BACKWARD)
{ // Backward motion
if (s->dquant)
{ // With QScale
put_bits(&s->pb, 6, 2);
put_bits(&s->pb, 5, s->qscale);
}
else // Without QScale
put_bits(&s->pb, 3, 3);
s->misc_bits += get_bits_diff(s);
mpeg1_encode_motion(s, motion_x - s->last_mv[1][0][0], s->b_code);
mpeg1_encode_motion(s, motion_y - s->last_mv[1][0][1], s->b_code);
s->b_count++;
s->mv_bits += get_bits_diff(s);
put_bits(&s->pb, mbPatTable[cbp - 1][1], mbPatTable[cbp - 1][0]);
}
else if (s->mv_dir == MV_DIR_FORWARD)
{ // Forward motion
if (s->dquant)
{ // With QScale
put_bits(&s->pb, 6, 3);
put_bits(&s->pb, 5, s->qscale);
}
else // Without QScale
put_bits(&s->pb, 4, 3);
s->misc_bits += get_bits_diff(s);
mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code);
mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code);
s->f_count++;
s->mv_bits += get_bits_diff(s);
put_bits(&s->pb, mbPatTable[cbp - 1][1], mbPatTable[cbp - 1][0]);
}
}
else
{ // No coded bloc pattern
if (s->mv_dir == (MV_DIR_FORWARD | MV_DIR_BACKWARD))
{ // Bi-directional motion
put_bits(&s->pb, 2, 2); /* backward & forward motion */
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);
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->b_count++;
s->f_count++;
}
else if (s->mv_dir == MV_DIR_BACKWARD)
{ // Backward motion
put_bits(&s->pb, 3, 2); /* backward motion only */
mpeg1_encode_motion(s, motion_x - s->last_mv[1][0][0], s->b_code);
mpeg1_encode_motion(s, motion_y - s->last_mv[1][0][1], s->b_code);
s->b_count++;
}
else if (s->mv_dir == MV_DIR_FORWARD)
{ // Forward motion
put_bits(&s->pb, 4, 2); /* forward motion only */
mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code);
mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code);
s->f_count++;
}
s->qscale -= s->dquant;
s->mv_bits += get_bits_diff(s);
}
// End of bloc from RAL
}
for(i=0;i<6;i++) {
if (cbp & (1 << (5 - i))) {
@ -454,11 +550,22 @@ void mpeg1_encode_mb(MpegEncContext *s,
else
s->p_tex_bits+= get_bits_diff(s);
}
s->last_mv[0][0][0] = motion_x;
s->last_mv[0][0][1] = motion_y;
// RAL: By this:
if (s->mv_dir & MV_DIR_FORWARD)
{
s->last_mv[0][0][0]= s->mv[0][0][0];
s->last_mv[0][0][1]= s->mv[0][0][1];
}
if (s->mv_dir & MV_DIR_BACKWARD)
{
s->last_mv[1][0][0]= s->mv[1][0][0];
s->last_mv[1][0][1]= s->mv[1][0][1];
}
}
static void mpeg1_encode_motion(MpegEncContext *s, int val)
// 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, m, bits, range, sign;
@ -469,7 +576,7 @@ static void mpeg1_encode_motion(MpegEncContext *s, int val)
mbMotionVectorTable[0][1],
mbMotionVectorTable[0][0]);
} else {
bit_size = s->f_code - 1;
bit_size = f_or_b_code - 1;
range = 1 << bit_size;
/* modulo encoding */
l = 16 * range;
@ -492,9 +599,13 @@ static void mpeg1_encode_motion(MpegEncContext *s, int val)
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);

34
libavcodec/mpegvideo.c
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@ -2872,7 +2872,8 @@ static void encode_picture(MpegEncContext *s, int picture_number)
#ifdef CONFIG_RISKY
/* we need to initialize some time vars before we can encode b-frames */
if (s->h263_pred && !s->h263_msmpeg4)
// RAL: Condition added for MPEG1VIDEO
if (s->codec_id == CODEC_ID_MPEG1VIDEO || (s->h263_pred && !s->h263_msmpeg4))
ff_set_mpeg4_time(s, s->picture_number);
#endif
@ -2965,12 +2966,24 @@ static void encode_picture(MpegEncContext *s, int picture_number)
//printf("Scene change detected, encoding as I Frame %d %d\n", s->current_picture.mb_var_sum, s->current_picture.mc_mb_var_sum);
}
if(s->pict_type==P_TYPE || s->pict_type==S_TYPE)
if(s->pict_type==P_TYPE || s->pict_type==S_TYPE) {
s->f_code= ff_get_best_fcode(s, s->p_mv_table, MB_TYPE_INTER);
// RAL: Next call moved into that bloc
ff_fix_long_p_mvs(s);
}
// RAL: All this bloc changed
if(s->pict_type==B_TYPE){
s->f_code= ff_get_best_fcode(s, s->b_forw_mv_table, MB_TYPE_FORWARD);
s->b_code= ff_get_best_fcode(s, s->b_back_mv_table, MB_TYPE_BACKWARD);
int a, b;
a = ff_get_best_fcode(s, s->b_forw_mv_table, MB_TYPE_FORWARD);
b = ff_get_best_fcode(s, s->b_bidir_forw_mv_table, MB_TYPE_BIDIR);
s->f_code = FFMAX(a, b);
a = ff_get_best_fcode(s, s->b_back_mv_table, MB_TYPE_BACKWARD);
b = ff_get_best_fcode(s, s->b_bidir_back_mv_table, MB_TYPE_BIDIR);
s->b_code = FFMAX(a, b);
ff_fix_long_b_mvs(s, s->b_forw_mv_table, s->f_code, MB_TYPE_FORWARD);
ff_fix_long_b_mvs(s, s->b_back_mv_table, s->b_code, MB_TYPE_BACKWARD);
@ -3064,6 +3077,10 @@ static void encode_picture(MpegEncContext *s, int picture_number)
s->mb_incr = 1;
s->last_mv[0][0][0] = 0;
s->last_mv[0][0][1] = 0;
s->last_mv[1][0][0] = 0;
s->last_mv[1][0][1] = 0;
s->last_mv_dir = 0;
#ifdef CONFIG_RISKY
if (s->codec_id==CODEC_ID_H263 || s->codec_id==CODEC_ID_H263P)
@ -3227,7 +3244,7 @@ static void encode_picture(MpegEncContext *s, int picture_number)
&dmin, &next_block, mx, my);
}
if(mb_type&MB_TYPE_INTRA){
s->mv_dir = MV_DIR_FORWARD;
s->mv_dir = 0;
s->mv_type = MV_TYPE_16X16;
s->mb_intra= 1;
s->mv[0][0][0] = 0;
@ -3348,7 +3365,7 @@ static void encode_picture(MpegEncContext *s, int picture_number)
switch(mb_type){
case MB_TYPE_INTRA:
s->mv_dir = MV_DIR_FORWARD;
s->mv_dir = 0;
s->mb_intra= 1;
motion_x= s->mv[0][0][0] = 0;
motion_y= s->mv[0][0][1] = 0;
@ -3405,8 +3422,13 @@ static void encode_picture(MpegEncContext *s, int picture_number)
motion_x=motion_y=0; //gcc warning fix
printf("illegal MB type\n");
}
encode_mb(s, motion_x, motion_y);
// RAL: Update last macrobloc type
s->last_mv_dir = s->mv_dir;
}
/* clean the MV table in IPS frames for direct mode in B frames */
if(s->mb_intra /* && I,P,S_TYPE */){
s->p_mv_table[xy][0]=0;

1
libavcodec/mpegvideo.h
View File

@ -508,6 +508,7 @@ typedef struct MpegEncContext {
/* Mpeg1 specific */
int fake_picture_number; /* picture number at the bitstream frame rate */
int gop_picture_number; /* index of the first picture of a GOP based on fake_pic_num & mpeg1 specific */
int last_mv_dir; /* last mv_dir, used for b frame encoding */
/* MPEG2 specific - I wish I had not to support this mess. */
int progressive_sequence;