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FFmpeg/libavcodec/wmv2enc.c
Andreas Rheinhardt abc54c25be avcodec/mpegvideo: Move loop_filter to {H263Dec,MPVEnc,VC1}Context 
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2025-07-03 20:35:32 +02:00

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/*
* Copyright (c) 2002 The FFmpeg Project
*
* 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
*/
#include "libavutil/mem.h"
#include "avcodec.h"
#include "codec_internal.h"
#include "h263.h"
#include "mpegvideo.h"
#include "mpegvideoenc.h"
#include "msmpeg4.h"
#include "msmpeg4enc.h"
#include "msmpeg4data.h"
#include "msmpeg4_vc1_data.h"
#include "put_bits.h"
#include "wmv2.h"
#define WMV2_EXTRADATA_SIZE 4
typedef struct WMV2EncContext {
MSMPEG4EncContext msmpeg4;
WMV2Context common;
int j_type_bit;
int j_type;
int abt_flag;
int abt_type;
int per_mb_abt;
int mspel_bit;
int cbp_table_index;
int top_left_mv_flag;
int per_mb_rl_bit;
} WMV2EncContext;
static int encode_ext_header(WMV2EncContext *w)
{
MPVEncContext *const s = &w->msmpeg4.m.s;
PutBitContext pb;
int code;
init_put_bits(&pb, s->c.avctx->extradata, WMV2_EXTRADATA_SIZE);
put_bits(&pb, 5, s->c.avctx->time_base.den / s->c.avctx->time_base.num); // yes 29.97 -> 29
put_bits(&pb, 11, FFMIN(w->msmpeg4.m.bit_rate / 1024, 2047));
put_bits(&pb, 1, w->mspel_bit = 1);
put_bits(&pb, 1, s->loop_filter);
put_bits(&pb, 1, w->abt_flag = 1);
put_bits(&pb, 1, w->j_type_bit = 1);
put_bits(&pb, 1, w->top_left_mv_flag = 0);
put_bits(&pb, 1, w->per_mb_rl_bit = 1);
put_bits(&pb, 3, code = 1);
flush_put_bits(&pb);
s->slice_height = s->c.mb_height / code;
return 0;
}
static int wmv2_encode_picture_header(MPVMainEncContext *const m)
{
WMV2EncContext *const w = (WMV2EncContext *) m;
MSMPEG4EncContext *const ms = &w->msmpeg4;
MPVEncContext *const s = &m->s;
put_bits_assume_flushed(&s->pb);
put_bits(&s->pb, 1, s->c.pict_type - 1);
if (s->c.pict_type == AV_PICTURE_TYPE_I)
put_bits(&s->pb, 7, 0);
put_bits(&s->pb, 5, s->c.qscale);
ms->dc_table_index = 1;
ms->mv_table_index = 1; /* only if P-frame */
ms->per_mb_rl_table = 0;
s->c.mspel = 0;
w->per_mb_abt = 0;
w->abt_type = 0;
w->j_type = 0;
av_assert0(s->flipflop_rounding);
if (s->c.pict_type == AV_PICTURE_TYPE_I) {
av_assert0(s->c.no_rounding == 1);
if (w->j_type_bit)
put_bits(&s->pb, 1, w->j_type);
if (w->per_mb_rl_bit)
put_bits(&s->pb, 1, ms->per_mb_rl_table);
if (!ms->per_mb_rl_table) {
ff_msmpeg4_code012(&s->pb, ms->rl_chroma_table_index);
ff_msmpeg4_code012(&s->pb, ms->rl_table_index);
}
put_bits(&s->pb, 1, ms->dc_table_index);
s->c.inter_intra_pred = 0;
} else {
int cbp_index;
put_bits(&s->pb, 2, SKIP_TYPE_NONE);
ff_msmpeg4_code012(&s->pb, cbp_index = 0);
w->cbp_table_index = wmv2_get_cbp_table_index(s->c.qscale, cbp_index);
if (w->mspel_bit)
put_bits(&s->pb, 1, s->c.mspel);
if (w->abt_flag) {
put_bits(&s->pb, 1, w->per_mb_abt ^ 1);
if (!w->per_mb_abt)
ff_msmpeg4_code012(&s->pb, w->abt_type);
}
if (w->per_mb_rl_bit)
put_bits(&s->pb, 1, ms->per_mb_rl_table);
if (!ms->per_mb_rl_table) {
ff_msmpeg4_code012(&s->pb, ms->rl_table_index);
ms->rl_chroma_table_index = ms->rl_table_index;
}
put_bits(&s->pb, 1, ms->dc_table_index);
put_bits(&s->pb, 1, ms->mv_table_index);
s->c.inter_intra_pred = 0; // (s->c.width * s->c.height < 320 * 240 && m->bit_rate <= II_BITRATE);
}
s->esc3_level_length = 0;
ms->esc3_run_length = 0;
return 0;
}
/* Nearly identical to wmv1 but that is just because we do not use the
* useless M$ crap features. It is duplicated here in case someone wants
* to add support for these crap features. */
static void wmv2_encode_mb(MPVEncContext *const s, int16_t block[][64],
int motion_x, int motion_y)
{
WMV2EncContext *const w = (WMV2EncContext *) s;
int cbp, coded_cbp, i;
int pred_x, pred_y;
uint8_t *coded_block;
ff_msmpeg4_handle_slices(s);
if (!s->c.mb_intra) {
/* compute cbp */
cbp = 0;
for (i = 0; i < 6; i++)
if (s->c.block_last_index[i] >= 0)
cbp |= 1 << (5 - i);
put_bits(&s->pb,
ff_wmv2_inter_table[w->cbp_table_index][cbp + 64][1],
ff_wmv2_inter_table[w->cbp_table_index][cbp + 64][0]);
s->misc_bits += get_bits_diff(s);
/* motion vector */
ff_h263_pred_motion(&s->c, 0, 0, &pred_x, &pred_y);
ff_msmpeg4_encode_motion(&w->msmpeg4, motion_x - pred_x,
motion_y - pred_y);
s->mv_bits += get_bits_diff(s);
} else {
/* compute cbp */
cbp = 0;
coded_cbp = 0;
for (i = 0; i < 6; i++) {
int val = (s->c.block_last_index[i] >= 1);
cbp |= val << (5 - i);
if (i < 4) {
/* predict value for close blocks only for luma */
int pred = ff_msmpeg4_coded_block_pred(&s->c, i, &coded_block);
*coded_block = val;
val = val ^ pred;
}
coded_cbp |= val << (5 - i);
}
if (s->c.pict_type == AV_PICTURE_TYPE_I)
put_bits(&s->pb,
ff_msmp4_mb_i_table[coded_cbp][1],
ff_msmp4_mb_i_table[coded_cbp][0]);
else
put_bits(&s->pb,
ff_wmv2_inter_table[w->cbp_table_index][cbp][1],
ff_wmv2_inter_table[w->cbp_table_index][cbp][0]);
put_bits(&s->pb, 1, 0); /* no AC prediction yet */
if (s->c.inter_intra_pred) {
s->c.h263_aic_dir = 0;
put_bits(&s->pb,
ff_table_inter_intra[s->c.h263_aic_dir][1],
ff_table_inter_intra[s->c.h263_aic_dir][0]);
}
s->misc_bits += get_bits_diff(s);
}
for (i = 0; i < 6; i++)
ff_msmpeg4_encode_block(s, block[i], i);
if (s->c.mb_intra)
s->i_tex_bits += get_bits_diff(s);
else
s->p_tex_bits += get_bits_diff(s);
}
static av_cold int wmv2_encode_init(AVCodecContext *avctx)
{
WMV2EncContext *const w = avctx->priv_data;
MPVEncContext *const s = &w->msmpeg4.m.s;
int ret;
w->msmpeg4.m.encode_picture_header = wmv2_encode_picture_header;
s->encode_mb = wmv2_encode_mb;
s->c.private_ctx = &w->common;
ret = ff_mpv_encode_init(avctx);
if (ret < 0)
return ret;
ff_wmv2_common_init(&s->c);
avctx->extradata_size = WMV2_EXTRADATA_SIZE;
avctx->extradata = av_mallocz(avctx->extradata_size + AV_INPUT_BUFFER_PADDING_SIZE);
if (!avctx->extradata)
return AVERROR(ENOMEM);
encode_ext_header(w);
return 0;
}
const FFCodec ff_wmv2_encoder = {
.p.name = "wmv2",
CODEC_LONG_NAME("Windows Media Video 8"),
.p.type = AVMEDIA_TYPE_VIDEO,
.p.id = AV_CODEC_ID_WMV2,
.p.priv_class = &ff_mpv_enc_class,
.p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_ENCODER_REORDERED_OPAQUE,
.priv_data_size = sizeof(WMV2EncContext),
.init = wmv2_encode_init,
FF_CODEC_ENCODE_CB(ff_mpv_encode_picture),
.close = ff_mpv_encode_end,
.caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
.color_ranges = AVCOL_RANGE_MPEG,
CODEC_PIXFMTS(AV_PIX_FMT_YUV420P),
};
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