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FFmpeg/libavcodec/mpegvideo.c
Juanjo e03c341ef3 - More work on preliminary bit rate control, just to be able to get an 
average variance for picture's MBs so we can adjust qscale on the MB layer.

Originally committed as revision 294 to svn://svn.ffmpeg.org/ffmpeg/trunk
2002-02-10 06:10:50 +00:00

1500 lines
47 KiB
C
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/*
* The simplest mpeg encoder (well, it was the simplest!)
* Copyright (c) 2000,2001 Gerard Lantau.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <stdlib.h>
#include <stdio.h>
#include <math.h>
#include <string.h>
#include "avcodec.h"
#include "dsputil.h"
#include "mpegvideo.h"
#ifdef USE_FASTMEMCPY
#include "fastmemcpy.h"
#endif
static void encode_picture(MpegEncContext *s, int picture_number);
static void rate_control_init(MpegEncContext *s);
static int rate_estimate_qscale(MpegEncContext *s);
static void dct_unquantize_mpeg1_c(MpegEncContext *s,
DCTELEM *block, int n, int qscale);
static void dct_unquantize_h263_c(MpegEncContext *s,
DCTELEM *block, int n, int qscale);
static void draw_edges_c(UINT8 *buf, int wrap, int width, int height, int w);
static int dct_quantize_c(MpegEncContext *s, DCTELEM *block, int n, int qscale);
int (*dct_quantize)(MpegEncContext *s, DCTELEM *block, int n, int qscale)= dct_quantize_c;
void (*draw_edges)(UINT8 *buf, int wrap, int width, int height, int w)= draw_edges_c;
#define EDGE_WIDTH 16
/* enable all paranoid tests for rounding, overflows, etc... */
//#define PARANOID
//#define DEBUG
/* for jpeg fast DCT */
#define CONST_BITS 14
static const unsigned short 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
};
static UINT8 h263_chroma_roundtab[16] = {
0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2,
};
/* default motion estimation */
int motion_estimation_method = ME_LOG;
extern UINT8 zigzag_end[64];
static void convert_matrix(int *qmat, UINT16 *qmat16, const UINT16 *quant_matrix, int qscale)
{
int i;
if (av_fdct == jpeg_fdct_ifast) {
for(i=0;i<64;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[block_permute_op(i)] = (int)((UINT64_C(1) << (QMAT_SHIFT + 11)) /
(aanscales[i] * qscale * quant_matrix[block_permute_op(i)]));
}
} else {
for(i=0;i<64;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[i] = (1 << QMAT_SHIFT_MMX) / (qscale * quant_matrix[i]);
qmat16[i] = (1 << QMAT_SHIFT_MMX) / (qscale * quant_matrix[block_permute_op(i)]);
}
}
}
/* init common structure for both encoder and decoder */
int MPV_common_init(MpegEncContext *s)
{
int c_size, i;
UINT8 *pict;
if (s->out_format == FMT_H263)
s->dct_unquantize = dct_unquantize_h263_c;
else
s->dct_unquantize = dct_unquantize_mpeg1_c;
#ifdef HAVE_MMX
MPV_common_init_mmx(s);
#endif
s->mb_width = (s->width + 15) / 16;
s->mb_height = (s->height + 15) / 16;
s->mb_num = s->mb_width * s->mb_height;
s->linesize = s->mb_width * 16 + 2 * EDGE_WIDTH;
for(i=0;i<3;i++) {
int w, h, shift, pict_start;
w = s->linesize;
h = s->mb_height * 16 + 2 * EDGE_WIDTH;
shift = (i == 0) ? 0 : 1;
c_size = (w >> shift) * (h >> shift);
pict_start = (w >> shift) * (EDGE_WIDTH >> shift) + (EDGE_WIDTH >> shift);
pict = av_mallocz(c_size);
if (pict == NULL)
goto fail;
s->last_picture_base[i] = pict;
s->last_picture[i] = pict + pict_start;
pict = av_mallocz(c_size);
if (pict == NULL)
goto fail;
s->next_picture_base[i] = pict;
s->next_picture[i] = pict + pict_start;
if (s->has_b_frames) {
pict = av_mallocz(c_size);
if (pict == NULL)
goto fail;
s->aux_picture_base[i] = pict;
s->aux_picture[i] = pict + pict_start;
}
}
if (s->encoding) {
/* Allocate MB type table */
s->mb_type = malloc(s->mb_num * sizeof(char));
if (s->mb_type == NULL) {
perror("malloc");
goto fail;
}
/* Allocate MV table */
/* By now we just have one MV per MB */
s->mv_table[0] = malloc(s->mb_num * sizeof(INT16));
s->mv_table[1] = malloc(s->mb_num * sizeof(INT16));
if (s->mv_table[1] == NULL || s->mv_table[0] == NULL) {
perror("malloc");
goto fail;
}
}
if (s->out_format == FMT_H263) {
int size;
/* MV prediction */
size = (2 * s->mb_width + 2) * (2 * s->mb_height + 2);
s->motion_val = malloc(size * 2 * sizeof(INT16));
if (s->motion_val == NULL)
goto fail;
memset(s->motion_val, 0, size * 2 * sizeof(INT16));
}
if (s->h263_pred) {
int y_size, c_size, i, size;
/* dc values */
y_size = (2 * s->mb_width + 2) * (2 * s->mb_height + 2);
c_size = (s->mb_width + 2) * (s->mb_height + 2);
size = y_size + 2 * c_size;
s->dc_val[0] = malloc(size * sizeof(INT16));
if (s->dc_val[0] == NULL)
goto fail;
s->dc_val[1] = s->dc_val[0] + y_size;
s->dc_val[2] = s->dc_val[1] + c_size;
for(i=0;i<size;i++)
s->dc_val[0][i] = 1024;
/* ac values */
s->ac_val[0] = av_mallocz(size * sizeof(INT16) * 16);
if (s->ac_val[0] == NULL)
goto fail;
s->ac_val[1] = s->ac_val[0] + y_size;
s->ac_val[2] = s->ac_val[1] + c_size;
/* cbp values */
s->coded_block = av_mallocz(y_size);
if (!s->coded_block)
goto fail;
/* which mb is a intra block */
s->mbintra_table = av_mallocz(s->mb_num);
if (!s->mbintra_table)
goto fail;
memset(s->mbintra_table, 1, s->mb_num);
}
/* default structure is frame */
s->picture_structure = PICT_FRAME;
/* init macroblock skip table */
if (!s->encoding) {
s->mbskip_table = av_mallocz(s->mb_num);
if (!s->mbskip_table)
goto fail;
}
s->context_initialized = 1;
return 0;
fail:
if (s->mb_type)
free(s->mb_type);
if (s->mv_table[0])
free(s->mv_table[0]);
if (s->mv_table[1])
free(s->mv_table[1]);
if (s->motion_val)
free(s->motion_val);
if (s->dc_val[0])
free(s->dc_val[0]);
if (s->ac_val[0])
free(s->ac_val[0]);
if (s->coded_block)
free(s->coded_block);
if (s->mbintra_table)
free(s->mbintra_table);
if (s->mbskip_table)
free(s->mbskip_table);
for(i=0;i<3;i++) {
if (s->last_picture_base[i])
free(s->last_picture_base[i]);
if (s->next_picture_base[i])
free(s->next_picture_base[i]);
if (s->aux_picture_base[i])
free(s->aux_picture_base[i]);
}
return -1;
}
/* init common structure for both encoder and decoder */
void MPV_common_end(MpegEncContext *s)
{
int i;
if (s->mb_type)
free(s->mb_type);
if (s->mv_table[0])
free(s->mv_table[0]);
if (s->mv_table[1])
free(s->mv_table[1]);
if (s->motion_val)
free(s->motion_val);
if (s->h263_pred) {
free(s->dc_val[0]);
free(s->ac_val[0]);
free(s->coded_block);
free(s->mbintra_table);
}
if (s->mbskip_table)
free(s->mbskip_table);
for(i=0;i<3;i++) {
free(s->last_picture_base[i]);
free(s->next_picture_base[i]);
if (s->has_b_frames)
free(s->aux_picture_base[i]);
}
s->context_initialized = 0;
}
/* init video encoder */
int MPV_encode_init(AVCodecContext *avctx)
{
MpegEncContext *s = avctx->priv_data;
int i;
s->bit_rate = avctx->bit_rate;
s->frame_rate = avctx->frame_rate;
s->width = avctx->width;
s->height = avctx->height;
s->gop_size = avctx->gop_size;
s->rtp_mode = avctx->rtp_mode;
s->rtp_payload_size = avctx->rtp_payload_size;
if (avctx->rtp_callback)
s->rtp_callback = avctx->rtp_callback;
s->avctx = avctx;
if (s->gop_size <= 1) {
s->intra_only = 1;
s->gop_size = 12;
} else {
s->intra_only = 0;
}
s->full_search = motion_estimation_method;
s->fixed_qscale = (avctx->flags & CODEC_FLAG_QSCALE);
switch(avctx->codec->id) {
case CODEC_ID_MPEG1VIDEO:
s->out_format = FMT_MPEG1;
break;
case CODEC_ID_MJPEG:
s->out_format = FMT_MJPEG;
s->intra_only = 1; /* force intra only for jpeg */
s->mjpeg_write_tables = 1; /* write all tables */
s->mjpeg_vsample[0] = 2; /* set up default sampling factors */
s->mjpeg_vsample[1] = 1; /* the only currently supported values */
s->mjpeg_vsample[2] = 1;
s->mjpeg_hsample[0] = 2;
s->mjpeg_hsample[1] = 1;
s->mjpeg_hsample[2] = 1;
if (mjpeg_init(s) < 0)
return -1;
break;
case CODEC_ID_H263:
if (h263_get_picture_format(s->width, s->height) == 7) {
printf("Input picture size isn't suitable for h263 codec! try h263+\n");
return -1;
}
s->out_format = FMT_H263;
break;
case CODEC_ID_H263P:
s->out_format = FMT_H263;
s->rtp_mode = 1;
s->rtp_payload_size = 1200;
s->h263_plus = 1;
s->unrestricted_mv = 1;
/* These are just to be sure */
s->umvplus = 0;
s->umvplus_dec = 0;
break;
case CODEC_ID_RV10:
s->out_format = FMT_H263;
s->h263_rv10 = 1;
break;
case CODEC_ID_MPEG4:
s->out_format = FMT_H263;
s->h263_pred = 1;
s->unrestricted_mv = 1;
break;
case CODEC_ID_MSMPEG4:
s->out_format = FMT_H263;
s->h263_msmpeg4 = 1;
s->h263_pred = 1;
s->unrestricted_mv = 1;
break;
default:
return -1;
}
if (s->out_format == FMT_H263)
h263_encode_init_vlc(s);
s->encoding = 1;
/* init */
if (MPV_common_init(s) < 0)
return -1;
/* init default q matrix */
for(i=0;i<64;i++) {
s->intra_matrix[i] = default_intra_matrix[i];
s->non_intra_matrix[i] = default_non_intra_matrix[i];
}
/* rate control init */
rate_control_init(s);
s->picture_number = 0;
s->fake_picture_number = 0;
/* motion detector init */
s->f_code = 1;
return 0;
}
int MPV_encode_end(AVCodecContext *avctx)
{
MpegEncContext *s = avctx->priv_data;
#ifdef STATS
print_stats();
#endif
MPV_common_end(s);
if (s->out_format == FMT_MJPEG)
mjpeg_close(s);
return 0;
}
/* draw the edges of width 'w' of an image of size width, height */
static void draw_edges_c(UINT8 *buf, int wrap, int width, int height, int w)
{
UINT8 *ptr, *last_line;
int i;
last_line = buf + (height - 1) * wrap;
for(i=0;i<w;i++) {
/* top and bottom */
memcpy(buf - (i + 1) * wrap, buf, width);
memcpy(last_line + (i + 1) * wrap, last_line, width);
}
/* left and right */
ptr = buf;
for(i=0;i<height;i++) {
memset(ptr - w, ptr[0], w);
memset(ptr + width, ptr[width-1], w);
ptr += wrap;
}
/* corners */
for(i=0;i<w;i++) {
memset(buf - (i + 1) * wrap - w, buf[0], w); /* top left */
memset(buf - (i + 1) * wrap + width, buf[width-1], w); /* top right */
memset(last_line + (i + 1) * wrap - w, last_line[0], w); /* top left */
memset(last_line + (i + 1) * wrap + width, last_line[width-1], w); /* top right */
}
}
/* generic function for encode/decode called before a frame is coded/decoded */
void MPV_frame_start(MpegEncContext *s)
{
int i;
UINT8 *tmp;
s->mb_skiped = 0;
if (s->pict_type == B_TYPE) {
for(i=0;i<3;i++) {
s->current_picture[i] = s->aux_picture[i];
}
} else {
for(i=0;i<3;i++) {
/* swap next and last */
tmp = s->last_picture[i];
s->last_picture[i] = s->next_picture[i];
s->next_picture[i] = tmp;
s->current_picture[i] = tmp;
}
}
}
/* generic function for encode/decode called after a frame has been coded/decoded */
void MPV_frame_end(MpegEncContext *s)
{
/* draw edge for correct motion prediction if outside */
if (s->pict_type != B_TYPE && !s->intra_only) {
if(s->avctx==NULL || s->avctx->codec->id!=CODEC_ID_MPEG4){
draw_edges(s->current_picture[0], s->linesize, s->mb_width*16, s->mb_height*16, EDGE_WIDTH);
draw_edges(s->current_picture[1], s->linesize/2, s->mb_width*8, s->mb_height*8, EDGE_WIDTH/2);
draw_edges(s->current_picture[2], s->linesize/2, s->mb_width*8, s->mb_height*8, EDGE_WIDTH/2);
}else{
/* OpenDivx, but i dunno how to distinguish it from mpeg4 */
draw_edges(s->current_picture[0], s->linesize, s->width, s->height, EDGE_WIDTH);
draw_edges(s->current_picture[1], s->linesize/2, s->width/2, s->height/2, EDGE_WIDTH/2);
draw_edges(s->current_picture[2], s->linesize/2, s->width/2, s->height/2, EDGE_WIDTH/2);
}
}
emms_c();
}
int MPV_encode_picture(AVCodecContext *avctx,
unsigned char *buf, int buf_size, void *data)
{
MpegEncContext *s = avctx->priv_data;
AVPicture *pict = data;
int i, j;
if (s->fixed_qscale)
s->qscale = avctx->quality;
init_put_bits(&s->pb, buf, buf_size, NULL, NULL);
if (!s->intra_only) {
/* first picture of GOP is intra */
if ((s->picture_number % s->gop_size) == 0)
s->pict_type = I_TYPE;
else
s->pict_type = P_TYPE;
} else {
s->pict_type = I_TYPE;
}
avctx->key_frame = (s->pict_type == I_TYPE);
MPV_frame_start(s);
for(i=0;i<3;i++) {
UINT8 *src = pict->data[i];
UINT8 *dest = s->current_picture[i];
int src_wrap = pict->linesize[i];
int dest_wrap = s->linesize;
int w = s->width;
int h = s->height;
if (i >= 1) {
dest_wrap >>= 1;
w >>= 1;
h >>= 1;
}
if(dest_wrap==src_wrap){
s->new_picture[i] = pict->data[i];
} else {
for(j=0;j<h;j++) {
memcpy(dest, src, w);
dest += dest_wrap;
src += src_wrap;
}
s->new_picture[i] = s->current_picture[i];
}
}
encode_picture(s, s->picture_number);
MPV_frame_end(s);
s->picture_number++;
if (s->out_format == FMT_MJPEG)
mjpeg_picture_trailer(s);
flush_put_bits(&s->pb);
s->total_bits += (s->pb.buf_ptr - s->pb.buf) * 8;
avctx->quality = s->qscale;
return s->pb.buf_ptr - s->pb.buf;
}
static inline int clip(int a, int amin, int amax)
{
if (a < amin)
return amin;
else if (a > amax)
return amax;
else
return a;
}
/* apply one mpeg motion vector to the three components */
static inline void mpeg_motion(MpegEncContext *s,
UINT8 *dest_y, UINT8 *dest_cb, UINT8 *dest_cr,
int dest_offset,
UINT8 **ref_picture, int src_offset,
int field_based, op_pixels_func *pix_op,
int motion_x, int motion_y, int h)
{
UINT8 *ptr;
int dxy, offset, mx, my, src_x, src_y, height, linesize;
dxy = ((motion_y & 1) << 1) | (motion_x & 1);
src_x = s->mb_x * 16 + (motion_x >> 1);
src_y = s->mb_y * (16 >> field_based) + (motion_y >> 1);
/* WARNING: do no forget half pels */
height = s->height >> field_based;
src_x = clip(src_x, -16, s->width);
if (src_x == s->width)
dxy &= ~1;
src_y = clip(src_y, -16, height);
if (src_y == height)
dxy &= ~2;
linesize = s->linesize << field_based;
ptr = ref_picture[0] + (src_y * linesize) + (src_x) + src_offset;
dest_y += dest_offset;
pix_op[dxy](dest_y, ptr, linesize, h);
pix_op[dxy](dest_y + 8, ptr + 8, linesize, h);
if (s->out_format == FMT_H263) {
dxy = 0;
if ((motion_x & 3) != 0)
dxy |= 1;
if ((motion_y & 3) != 0)
dxy |= 2;
mx = motion_x >> 2;
my = motion_y >> 2;
} else {
mx = motion_x / 2;
my = motion_y / 2;
dxy = ((my & 1) << 1) | (mx & 1);
mx >>= 1;
my >>= 1;
}
src_x = s->mb_x * 8 + mx;
src_y = s->mb_y * (8 >> field_based) + my;
src_x = clip(src_x, -8, s->width >> 1);
if (src_x == (s->width >> 1))
dxy &= ~1;
src_y = clip(src_y, -8, height >> 1);
if (src_y == (height >> 1))
dxy &= ~2;
offset = (src_y * (linesize >> 1)) + src_x + (src_offset >> 1);
ptr = ref_picture[1] + offset;
pix_op[dxy](dest_cb + (dest_offset >> 1), ptr, linesize >> 1, h >> 1);
ptr = ref_picture[2] + offset;
pix_op[dxy](dest_cr + (dest_offset >> 1), ptr, linesize >> 1, h >> 1);
}
static inline void MPV_motion(MpegEncContext *s,
UINT8 *dest_y, UINT8 *dest_cb, UINT8 *dest_cr,
int dir, UINT8 **ref_picture,
op_pixels_func *pix_op)
{
int dxy, offset, mx, my, src_x, src_y, motion_x, motion_y;
int mb_x, mb_y, i;
UINT8 *ptr, *dest;
mb_x = s->mb_x;
mb_y = s->mb_y;
switch(s->mv_type) {
case MV_TYPE_16X16:
mpeg_motion(s, dest_y, dest_cb, dest_cr, 0,
ref_picture, 0,
0, pix_op,
s->mv[dir][0][0], s->mv[dir][0][1], 16);
break;
case MV_TYPE_8X8:
for(i=0;i<4;i++) {
motion_x = s->mv[dir][i][0];
motion_y = s->mv[dir][i][1];
dxy = ((motion_y & 1) << 1) | (motion_x & 1);
src_x = mb_x * 16 + (motion_x >> 1) + (i & 1) * 8;
src_y = mb_y * 16 + (motion_y >> 1) + ((i >> 1) & 1) * 8;
/* WARNING: do no forget half pels */
src_x = clip(src_x, -16, s->width);
if (src_x == s->width)
dxy &= ~1;
src_y = clip(src_y, -16, s->height);
if (src_y == s->height)
dxy &= ~2;
ptr = ref_picture[0] + (src_y * s->linesize) + (src_x);
dest = dest_y + ((i & 1) * 8) + (i >> 1) * 8 * s->linesize;
pix_op[dxy](dest, ptr, s->linesize, 8);
}
/* In case of 8X8, we construct a single chroma motion vector
with a special rounding */
mx = 0;
my = 0;
for(i=0;i<4;i++) {
mx += s->mv[dir][i][0];
my += s->mv[dir][i][1];
}
if (mx >= 0)
mx = (h263_chroma_roundtab[mx & 0xf] + ((mx >> 3) & ~1));
else {
mx = -mx;
mx = -(h263_chroma_roundtab[mx & 0xf] + ((mx >> 3) & ~1));
}
if (my >= 0)
my = (h263_chroma_roundtab[my & 0xf] + ((my >> 3) & ~1));
else {
my = -my;
my = -(h263_chroma_roundtab[my & 0xf] + ((my >> 3) & ~1));
}
dxy = ((my & 1) << 1) | (mx & 1);
mx >>= 1;
my >>= 1;
src_x = mb_x * 8 + mx;
src_y = mb_y * 8 + my;
src_x = clip(src_x, -8, s->width/2);
if (src_x == s->width/2)
dxy &= ~1;
src_y = clip(src_y, -8, s->height/2);
if (src_y == s->height/2)
dxy &= ~2;
offset = (src_y * (s->linesize >> 1)) + src_x;
ptr = ref_picture[1] + offset;
pix_op[dxy](dest_cb, ptr, s->linesize >> 1, 8);
ptr = ref_picture[2] + offset;
pix_op[dxy](dest_cr, ptr, s->linesize >> 1, 8);
break;
case MV_TYPE_FIELD:
if (s->picture_structure == PICT_FRAME) {
/* top field */
mpeg_motion(s, dest_y, dest_cb, dest_cr, 0,
ref_picture, s->field_select[dir][0] ? s->linesize : 0,
1, pix_op,
s->mv[dir][0][0], s->mv[dir][0][1], 8);
/* bottom field */
mpeg_motion(s, dest_y, dest_cb, dest_cr, s->linesize,
ref_picture, s->field_select[dir][1] ? s->linesize : 0,
1, pix_op,
s->mv[dir][1][0], s->mv[dir][1][1], 8);
} else {
}
break;
}
}
/* put block[] to dest[] */
static inline void put_dct(MpegEncContext *s,
DCTELEM *block, int i, UINT8 *dest, int line_size)
{
if (!s->mpeg2)
s->dct_unquantize(s, block, i, s->qscale);
ff_idct (block);
put_pixels_clamped(block, dest, line_size);
}
/* add block[] to dest[] */
static inline void add_dct(MpegEncContext *s,
DCTELEM *block, int i, UINT8 *dest, int line_size)
{
if (s->block_last_index[i] >= 0) {
if (!s->mpeg2)
if(s->encoding || (!s->h263_msmpeg4))
s->dct_unquantize(s, block, i, s->qscale);
ff_idct (block);
add_pixels_clamped(block, dest, line_size);
}
}
/* generic function called after a macroblock has been parsed by the
decoder or after it has been encoded by the encoder.
Important variables used:
s->mb_intra : true if intra macroblock
s->mv_dir : motion vector direction
s->mv_type : motion vector type
s->mv : motion vector
s->interlaced_dct : true if interlaced dct used (mpeg2)
*/
void MPV_decode_mb(MpegEncContext *s, DCTELEM block[6][64])
{
int mb_x, mb_y, motion_x, motion_y;
int dct_linesize, dct_offset;
op_pixels_func *op_pix;
mb_x = s->mb_x;
mb_y = s->mb_y;
#ifdef FF_POSTPROCESS
quant_store[mb_y][mb_x]=s->qscale;
//printf("[%02d][%02d] %d\n",mb_x,mb_y,s->qscale);
#endif
/* update DC predictors for P macroblocks */
if (!s->mb_intra) {
if (s->h263_pred) {
if(s->mbintra_table[mb_x + mb_y*s->mb_width])
{
int wrap, x, y, v;
s->mbintra_table[mb_x + mb_y*s->mb_width]=0;
wrap = 2 * s->mb_width + 2;
v = 1024;
x = 2 * mb_x + 1;
y = 2 * mb_y + 1;
s->dc_val[0][(x) + (y) * wrap] = v;
s->dc_val[0][(x + 1) + (y) * wrap] = v;
s->dc_val[0][(x) + (y + 1) * wrap] = v;
s->dc_val[0][(x + 1) + (y + 1) * wrap] = v;
/* ac pred */
memset(s->ac_val[0][(x) + (y) * wrap], 0, 16 * sizeof(INT16));
memset(s->ac_val[0][(x + 1) + (y) * wrap], 0, 16 * sizeof(INT16));
memset(s->ac_val[0][(x) + (y + 1) * wrap], 0, 16 * sizeof(INT16));
memset(s->ac_val[0][(x + 1) + (y + 1) * wrap], 0, 16 * sizeof(INT16));
if (s->h263_msmpeg4) {
s->coded_block[(x) + (y) * wrap] = 0;
s->coded_block[(x + 1) + (y) * wrap] = 0;
s->coded_block[(x) + (y + 1) * wrap] = 0;
s->coded_block[(x + 1) + (y + 1) * wrap] = 0;
}
/* chroma */
wrap = s->mb_width + 2;
x = mb_x + 1;
y = mb_y + 1;
s->dc_val[1][(x) + (y) * wrap] = v;
s->dc_val[2][(x) + (y) * wrap] = v;
/* ac pred */
memset(s->ac_val[1][(x) + (y) * wrap], 0, 16 * sizeof(INT16));
memset(s->ac_val[2][(x) + (y) * wrap], 0, 16 * sizeof(INT16));
}
} else {
s->last_dc[0] = 128 << s->intra_dc_precision;
s->last_dc[1] = 128 << s->intra_dc_precision;
s->last_dc[2] = 128 << s->intra_dc_precision;
}
}
else if (s->h263_pred)
s->mbintra_table[mb_x + mb_y*s->mb_width]=1;
/* update motion predictor */
if (s->out_format == FMT_H263) {
int x, y, wrap;
x = 2 * mb_x + 1;
y = 2 * mb_y + 1;
wrap = 2 * s->mb_width + 2;
if (s->mb_intra) {
motion_x = 0;
motion_y = 0;
goto motion_init;
} else if (s->mv_type == MV_TYPE_16X16) {
motion_x = s->mv[0][0][0];
motion_y = s->mv[0][0][1];
motion_init:
/* no update if 8X8 because it has been done during parsing */
s->motion_val[(x) + (y) * wrap][0] = motion_x;
s->motion_val[(x) + (y) * wrap][1] = motion_y;
s->motion_val[(x + 1) + (y) * wrap][0] = motion_x;
s->motion_val[(x + 1) + (y) * wrap][1] = motion_y;
s->motion_val[(x) + (y + 1) * wrap][0] = motion_x;
s->motion_val[(x) + (y + 1) * wrap][1] = motion_y;
s->motion_val[(x + 1) + (y + 1) * wrap][0] = motion_x;
s->motion_val[(x + 1) + (y + 1) * wrap][1] = motion_y;
}
}
if (!s->intra_only) {
UINT8 *dest_y, *dest_cb, *dest_cr;
UINT8 *mbskip_ptr;
/* avoid copy if macroblock skipped in last frame too */
if (!s->encoding && s->pict_type != B_TYPE) {
mbskip_ptr = &s->mbskip_table[s->mb_y * s->mb_width + s->mb_x];
if (s->mb_skiped) {
s->mb_skiped = 0;
/* if previous was skipped too, then nothing to do ! */
if (*mbskip_ptr != 0)
goto the_end;
*mbskip_ptr = 1; /* indicate that this time we skiped it */
} else {
*mbskip_ptr = 0; /* not skipped */
}
}
dest_y = s->current_picture[0] + (mb_y * 16 * s->linesize) + mb_x * 16;
dest_cb = s->current_picture[1] + (mb_y * 8 * (s->linesize >> 1)) + mb_x * 8;
dest_cr = s->current_picture[2] + (mb_y * 8 * (s->linesize >> 1)) + mb_x * 8;
if (s->interlaced_dct) {
dct_linesize = s->linesize * 2;
dct_offset = s->linesize;
} else {
dct_linesize = s->linesize;
dct_offset = s->linesize * 8;
}
if (!s->mb_intra) {
/* motion handling */
if (!s->no_rounding)
op_pix = put_pixels_tab;
else
op_pix = put_no_rnd_pixels_tab;
if (s->mv_dir & MV_DIR_FORWARD) {
MPV_motion(s, dest_y, dest_cb, dest_cr, 0, s->last_picture, op_pix);
if (!s->no_rounding)
op_pix = avg_pixels_tab;
else
op_pix = avg_no_rnd_pixels_tab;
}
if (s->mv_dir & MV_DIR_BACKWARD) {
MPV_motion(s, dest_y, dest_cb, dest_cr, 1, s->next_picture, op_pix);
}
/* add dct residue */
add_dct(s, block[0], 0, dest_y, dct_linesize);
add_dct(s, block[1], 1, dest_y + 8, dct_linesize);
add_dct(s, block[2], 2, dest_y + dct_offset, dct_linesize);
add_dct(s, block[3], 3, dest_y + dct_offset + 8, dct_linesize);
add_dct(s, block[4], 4, dest_cb, s->linesize >> 1);
add_dct(s, block[5], 5, dest_cr, s->linesize >> 1);
} else {
/* dct only in intra block */
put_dct(s, block[0], 0, dest_y, dct_linesize);
put_dct(s, block[1], 1, dest_y + 8, dct_linesize);
put_dct(s, block[2], 2, dest_y + dct_offset, dct_linesize);
put_dct(s, block[3], 3, dest_y + dct_offset + 8, dct_linesize);
put_dct(s, block[4], 4, dest_cb, s->linesize >> 1);
put_dct(s, block[5], 5, dest_cr, s->linesize >> 1);
}
}
the_end:
emms_c();
}
static void encode_picture(MpegEncContext *s, int picture_number)
{
int mb_x, mb_y, wrap, last_gob, pdif = 0;
UINT8 *ptr;
int i, motion_x, motion_y;
s->picture_number = picture_number;
if (!s->fixed_qscale)
s->qscale = rate_estimate_qscale(s);
/* precompute matrix */
if (s->out_format == FMT_MJPEG) {
/* for mjpeg, we do include qscale in the matrix */
s->intra_matrix[0] = default_intra_matrix[0];
for(i=1;i<64;i++)
s->intra_matrix[i] = (default_intra_matrix[i] * s->qscale) >> 3;
convert_matrix(s->q_intra_matrix, s->q_intra_matrix16, s->intra_matrix, 8);
} else {
convert_matrix(s->q_intra_matrix, s->q_intra_matrix16, s->intra_matrix, s->qscale);
convert_matrix(s->q_non_intra_matrix, s->q_non_intra_matrix16, s->non_intra_matrix, s->qscale);
}
switch(s->out_format) {
case FMT_MJPEG:
mjpeg_picture_header(s);
break;
case FMT_H263:
if (s->h263_msmpeg4)
msmpeg4_encode_picture_header(s, picture_number);
else if (s->h263_pred)
mpeg4_encode_picture_header(s, picture_number);
else if (s->h263_rv10)
rv10_encode_picture_header(s, picture_number);
else
h263_encode_picture_header(s, picture_number);
break;
case FMT_MPEG1:
mpeg1_encode_picture_header(s, picture_number);
break;
}
/* init last dc values */
/* note: quant matrix value (8) is implied here */
s->last_dc[0] = 128;
s->last_dc[1] = 128;
s->last_dc[2] = 128;
s->mb_incr = 1;
s->last_mv[0][0][0] = 0;
s->last_mv[0][0][1] = 0;
s->mv_type = MV_TYPE_16X16;
s->mv_dir = MV_DIR_FORWARD;
/* Get the GOB height based on picture height */
if (s->out_format == FMT_H263 && !s->h263_pred && !s->h263_msmpeg4) {
if (s->height <= 400)
s->gob_index = 1;
else if (s->height <= 800)
s->gob_index = 2;
else
s->gob_index = 4;
}
/* Reset the average MB variance */
s->avg_mb_var = 0;
/* Estimate motion for every MB */
for(mb_y=0; mb_y < s->mb_height; mb_y++) {
for(mb_x=0; mb_x < s->mb_width; mb_x++) {
s->mb_x = mb_x;
s->mb_y = mb_y;
/* compute motion vector and macro block type (intra or non intra) */
motion_x = 0;
motion_y = 0;
if (s->pict_type == P_TYPE) {
s->mb_intra = estimate_motion(s, mb_x, mb_y,
&motion_x,
&motion_y);
} else {
s->mb_intra = 1;
}
/* Store MB type and MV */
s->mb_type[mb_y * s->mb_width + mb_x] = s->mb_intra;
s->mv_table[0][mb_y * s->mb_width + mb_x] = motion_x;
s->mv_table[1][mb_y * s->mb_width + mb_x] = motion_y;
}
}
s->avg_mb_var = s->avg_mb_var / s->mb_num;
for(mb_y=0; mb_y < s->mb_height; mb_y++) {
/* Put GOB header based on RTP MTU */
/* TODO: Put all this stuff in a separate generic function */
if (s->rtp_mode) {
if (!mb_y) {
s->ptr_lastgob = s->pb.buf;
s->ptr_last_mb_line = s->pb.buf;
} else if (s->out_format == FMT_H263 && !s->h263_pred && !s->h263_msmpeg4 && !(mb_y % s->gob_index)) {
last_gob = h263_encode_gob_header(s, mb_y);
if (last_gob) {
s->first_gob_line = 1;
}
}
}
for(mb_x=0; mb_x < s->mb_width; mb_x++) {
s->mb_x = mb_x;
s->mb_y = mb_y;
#if 0
/* compute motion vector and macro block type (intra or non intra) */
motion_x = 0;
motion_y = 0;
if (s->pict_type == P_TYPE) {
s->mb_intra = estimate_motion(s, mb_x, mb_y,
&motion_x,
&motion_y);
} else {
s->mb_intra = 1;
}
#endif
s->mb_intra = s->mb_type[mb_y * s->mb_width + mb_x];
motion_x = s->mv_table[0][mb_y * s->mb_width + mb_x];
motion_y = s->mv_table[1][mb_y * s->mb_width + mb_x];
/* get the pixels */
wrap = s->linesize;
ptr = s->new_picture[0] + (mb_y * 16 * wrap) + mb_x * 16;
get_pixels(s->block[0], ptr, wrap);
get_pixels(s->block[1], ptr + 8, wrap);
get_pixels(s->block[2], ptr + 8 * wrap, wrap);
get_pixels(s->block[3], ptr + 8 * wrap + 8, wrap);
wrap = s->linesize >> 1;
ptr = s->new_picture[1] + (mb_y * 8 * wrap) + mb_x * 8;
get_pixels(s->block[4], ptr, wrap);
wrap = s->linesize >> 1;
ptr = s->new_picture[2] + (mb_y * 8 * wrap) + mb_x * 8;
get_pixels(s->block[5], ptr, wrap);
/* subtract previous frame if non intra */
if (!s->mb_intra) {
int dxy, offset, mx, my;
dxy = ((motion_y & 1) << 1) | (motion_x & 1);
ptr = s->last_picture[0] +
((mb_y * 16 + (motion_y >> 1)) * s->linesize) +
(mb_x * 16 + (motion_x >> 1));
sub_pixels_2(s->block[0], ptr, s->linesize, dxy);
sub_pixels_2(s->block[1], ptr + 8, s->linesize, dxy);
sub_pixels_2(s->block[2], ptr + s->linesize * 8, s->linesize, dxy);
sub_pixels_2(s->block[3], ptr + 8 + s->linesize * 8, s->linesize ,dxy);
if (s->out_format == FMT_H263) {
/* special rounding for h263 */
dxy = 0;
if ((motion_x & 3) != 0)
dxy |= 1;
if ((motion_y & 3) != 0)
dxy |= 2;
mx = motion_x >> 2;
my = motion_y >> 2;
} else {
mx = motion_x / 2;
my = motion_y / 2;
dxy = ((my & 1) << 1) | (mx & 1);
mx >>= 1;
my >>= 1;
}
offset = ((mb_y * 8 + my) * (s->linesize >> 1)) + (mb_x * 8 + mx);
ptr = s->last_picture[1] + offset;
sub_pixels_2(s->block[4], ptr, s->linesize >> 1, dxy);
ptr = s->last_picture[2] + offset;
sub_pixels_2(s->block[5], ptr, s->linesize >> 1, dxy);
}
emms_c();
/* DCT & quantize */
if (s->h263_msmpeg4) {
msmpeg4_dc_scale(s);
} else if (s->h263_pred) {
h263_dc_scale(s);
} else {
/* default quantization values */
s->y_dc_scale = 8;
s->c_dc_scale = 8;
}
for(i=0;i<6;i++) {
s->block_last_index[i] = dct_quantize(s, s->block[i], i, s->qscale);
}
/* huffman encode */
switch(s->out_format) {
case FMT_MPEG1:
mpeg1_encode_mb(s, s->block, motion_x, motion_y);
break;
case FMT_H263:
if (s->h263_msmpeg4)
msmpeg4_encode_mb(s, s->block, motion_x, motion_y);
else
h263_encode_mb(s, s->block, motion_x, motion_y);
break;
case FMT_MJPEG:
mjpeg_encode_mb(s, s->block);
break;
}
/* decompress blocks so that we keep the state of the decoder */
s->mv[0][0][0] = motion_x;
s->mv[0][0][1] = motion_y;
MPV_decode_mb(s, s->block);
}
/* Obtain average GOB size for RTP */
if (s->rtp_mode) {
if (!mb_y)
s->mb_line_avgsize = s->pb.buf_ptr - s->ptr_last_mb_line;
else if (!(mb_y % s->gob_index)) {
s->mb_line_avgsize = (s->mb_line_avgsize + s->pb.buf_ptr - s->ptr_last_mb_line) >> 1;
s->ptr_last_mb_line = s->pb.buf_ptr;
}
//fprintf(stderr, "\nMB line: %d\tSize: %u\tAvg. Size: %u", s->mb_y,
// (s->pb.buf_ptr - s->ptr_last_mb_line), s->mb_line_avgsize);
s->first_gob_line = 0;
}
}
if (s->h263_msmpeg4)
msmpeg4_encode_ext_header(s);
//if (s->gob_number)
// fprintf(stderr,"\nNumber of GOB: %d", s->gob_number);
/* Send the last GOB if RTP */
if (s->rtp_mode) {
flush_put_bits(&s->pb);
pdif = s->pb.buf_ptr - s->ptr_lastgob;
/* Call the RTP callback to send the last GOB */
if (s->rtp_callback)
s->rtp_callback(s->ptr_lastgob, pdif, s->gob_number);
s->ptr_lastgob = s->pb.buf_ptr;
//fprintf(stderr,"\nGOB: %2d size: %d (last)", s->gob_number, pdif);
}
}
static int dct_quantize_c(MpegEncContext *s,
DCTELEM *block, int n,
int qscale)
{
int i, j, level, last_non_zero, q;
const int *qmat;
int minLevel, maxLevel;
if(s->avctx!=NULL && s->avctx->codec->id==CODEC_ID_MPEG4){
/* mpeg4 */
minLevel= -2048;
maxLevel= 2047;
}else if(s->out_format==FMT_MPEG1){
/* mpeg1 */
minLevel= -255;
maxLevel= 255;
}else if(s->out_format==FMT_MJPEG){
/* (m)jpeg */
minLevel= -1023;
maxLevel= 1023;
}else{
/* h263 / msmpeg4 */
minLevel= -128;
maxLevel= 127;
}
av_fdct (block);
/* we need this permutation so that we correct the IDCT
permutation. will be moved into DCT code */
block_permute(block);
if (s->mb_intra) {
if (n < 4)
q = s->y_dc_scale;
else
q = s->c_dc_scale;
q = q << 3;
/* note: block[0] is assumed to be positive */
block[0] = (block[0] + (q >> 1)) / q;
i = 1;
last_non_zero = 0;
if (s->out_format == FMT_H263) {
qmat = s->q_non_intra_matrix;
} else {
qmat = s->q_intra_matrix;
}
} else {
i = 0;
last_non_zero = -1;
qmat = s->q_non_intra_matrix;
}
for(;i<64;i++) {
j = zigzag_direct[i];
level = block[j];
level = level * qmat[j];
#ifdef PARANOID
{
static int count = 0;
int level1, level2, qmat1;
double val;
if (qmat == s->q_non_intra_matrix) {
qmat1 = default_non_intra_matrix[j] * s->qscale;
} else {
qmat1 = default_intra_matrix[j] * s->qscale;
}
if (av_fdct != jpeg_fdct_ifast)
val = ((double)block[j] * 8.0) / (double)qmat1;
else
val = ((double)block[j] * 8.0 * 2048.0) /
((double)qmat1 * aanscales[j]);
level1 = (int)val;
level2 = level / (1 << (QMAT_SHIFT - 3));
if (level1 != level2) {
fprintf(stderr, "%d: quant error qlevel=%d wanted=%d level=%d qmat1=%d qmat=%d wantedf=%0.6f\n",
count, level2, level1, block[j], qmat1, qmat[j],
val);
count++;
}
}
#endif
/* XXX: slight error for the low range. Test should be equivalent to
(level <= -(1 << (QMAT_SHIFT - 3)) || level >= (1 <<
(QMAT_SHIFT - 3)))
*/
if (((level << (31 - (QMAT_SHIFT - 3))) >> (31 - (QMAT_SHIFT - 3))) !=
level) {
level = level / (1 << (QMAT_SHIFT - 3));
/* XXX: currently, this code is not optimal. the range should be:
mpeg1: -255..255
mpeg2: -2048..2047
h263: -128..127
mpeg4: -2048..2047
*/
if (level > maxLevel)
level = maxLevel;
else if (level < minLevel)
level = minLevel;
block[j] = level;
last_non_zero = i;
} else {
block[j] = 0;
}
}
return last_non_zero;
}
static void dct_unquantize_mpeg1_c(MpegEncContext *s,
DCTELEM *block, int n, int qscale)
{
int i, level, nCoeffs;
const UINT16 *quant_matrix;
if(s->alternate_scan) nCoeffs= 64;
else nCoeffs= s->block_last_index[n]+1;
if (s->mb_intra) {
if (n < 4)
block[0] = block[0] * s->y_dc_scale;
else
block[0] = block[0] * s->c_dc_scale;
/* XXX: only mpeg1 */
quant_matrix = s->intra_matrix;
for(i=1;i<nCoeffs;i++) {
int j= zigzag_direct[i];
level = block[j];
if (level) {
if (level < 0) {
level = -level;
level = (int)(level * qscale * quant_matrix[j]) >> 3;
level = (level - 1) | 1;
level = -level;
} else {
level = (int)(level * qscale * quant_matrix[j]) >> 3;
level = (level - 1) | 1;
}
#ifdef PARANOID
if (level < -2048 || level > 2047)
fprintf(stderr, "unquant error %d %d\n", i, level);
#endif
block[j] = level;
}
}
} else {
i = 0;
quant_matrix = s->non_intra_matrix;
for(;i<nCoeffs;i++) {
int j= zigzag_direct[i];
level = block[j];
if (level) {
if (level < 0) {
level = -level;
level = (((level << 1) + 1) * qscale *
((int) (quant_matrix[j]))) >> 4;
level = (level - 1) | 1;
level = -level;
} else {
level = (((level << 1) + 1) * qscale *
((int) (quant_matrix[j]))) >> 4;
level = (level - 1) | 1;
}
#ifdef PARANOID
if (level < -2048 || level > 2047)
fprintf(stderr, "unquant error %d %d\n", i, level);
#endif
block[j] = level;
}
}
}
}
static void dct_unquantize_h263_c(MpegEncContext *s,
DCTELEM *block, int n, int qscale)
{
int i, level, qmul, qadd;
int nCoeffs;
if (s->mb_intra) {
if (n < 4)
block[0] = block[0] * s->y_dc_scale;
else
block[0] = block[0] * s->c_dc_scale;
i = 1;
nCoeffs= 64; //does not allways use zigzag table
} else {
i = 0;
nCoeffs= zigzag_end[ s->block_last_index[n] ];
}
qmul = s->qscale << 1;
qadd = (s->qscale - 1) | 1;
for(;i<nCoeffs;i++) {
level = block[i];
if (level) {
if (level < 0) {
level = level * qmul - qadd;
} else {
level = level * qmul + qadd;
}
#ifdef PARANOID
if (level < -2048 || level > 2047)
fprintf(stderr, "unquant error %d %d\n", i, level);
#endif
block[i] = level;
}
}
}
/* rate control */
/* an I frame is I_FRAME_SIZE_RATIO bigger than a P frame */
#define I_FRAME_SIZE_RATIO 3.0
#define QSCALE_K 20
static void rate_control_init(MpegEncContext *s)
{
s->wanted_bits = 0;
if (s->intra_only) {
s->I_frame_bits = ((INT64)s->bit_rate * FRAME_RATE_BASE) / s->frame_rate;
s->P_frame_bits = s->I_frame_bits;
} else {
s->P_frame_bits = (int) ((float)(s->gop_size * s->bit_rate) /
(float)((float)s->frame_rate / FRAME_RATE_BASE * (I_FRAME_SIZE_RATIO + s->gop_size - 1)));
s->I_frame_bits = (int)(s->P_frame_bits * I_FRAME_SIZE_RATIO);
}
#if defined(DEBUG)
printf("I_frame_size=%d P_frame_size=%d\n",
s->I_frame_bits, s->P_frame_bits);
#endif
}
/*
* This heuristic is rather poor, but at least we do not have to
* change the qscale at every macroblock.
*/
static int rate_estimate_qscale(MpegEncContext *s)
{
INT64 diff, total_bits = s->total_bits;
float q;
int qscale, qmin;
if (s->pict_type == I_TYPE) {
s->wanted_bits += s->I_frame_bits;
} else {
s->wanted_bits += s->P_frame_bits;
}
diff = s->wanted_bits - total_bits;
q = 31.0 - (float)diff / (QSCALE_K * s->mb_height * s->mb_width);
/* adjust for I frame */
if (s->pict_type == I_TYPE && !s->intra_only) {
q /= I_FRAME_SIZE_RATIO;
}
/* using a too small Q scale leeds to problems in mpeg1 and h263
because AC coefficients are clamped to 255 or 127 */
qmin = 3;
if (q < qmin)
q = qmin;
else if (q > 31)
q = 31;
qscale = (int)(q + 0.5);
#if defined(DEBUG)
printf("%d: total=%0.0f br=%0.1f diff=%d qest=%0.1f\n",
s->picture_number,
(double)total_bits,
(float)s->frame_rate / FRAME_RATE_BASE *
total_bits / s->picture_number,
diff, q);
#endif
return qscale;
}
AVCodec mpeg1video_encoder = {
"mpeg1video",
CODEC_TYPE_VIDEO,
CODEC_ID_MPEG1VIDEO,
sizeof(MpegEncContext),
MPV_encode_init,
MPV_encode_picture,
MPV_encode_end,
};
AVCodec h263_encoder = {
"h263",
CODEC_TYPE_VIDEO,
CODEC_ID_H263,
sizeof(MpegEncContext),
MPV_encode_init,
MPV_encode_picture,
MPV_encode_end,
};
AVCodec h263p_encoder = {
"h263p",
CODEC_TYPE_VIDEO,
CODEC_ID_H263P,
sizeof(MpegEncContext),
MPV_encode_init,
MPV_encode_picture,
MPV_encode_end,
};
AVCodec rv10_encoder = {
"rv10",
CODEC_TYPE_VIDEO,
CODEC_ID_RV10,
sizeof(MpegEncContext),
MPV_encode_init,
MPV_encode_picture,
MPV_encode_end,
};
AVCodec mjpeg_encoder = {
"mjpeg",
CODEC_TYPE_VIDEO,
CODEC_ID_MJPEG,
sizeof(MpegEncContext),
MPV_encode_init,
MPV_encode_picture,
MPV_encode_end,
};
AVCodec mpeg4_encoder = {
"mpeg4",
CODEC_TYPE_VIDEO,
CODEC_ID_MPEG4,
sizeof(MpegEncContext),
MPV_encode_init,
MPV_encode_picture,
MPV_encode_end,
};
AVCodec msmpeg4_encoder = {
"msmpeg4",
CODEC_TYPE_VIDEO,
CODEC_ID_MSMPEG4,
sizeof(MpegEncContext),
MPV_encode_init,
MPV_encode_picture,
MPV_encode_end,
};
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