2 * Copyright (c) 2002 The FFmpeg Project
4 * This file is part of FFmpeg.
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23 #include "mpegvideo.h"
25 #include "msmpeg4data.h"
29 static int encode_ext_header(Wmv2Context *w)
31 MpegEncContext *const s = &w->s;
35 init_put_bits(&pb, s->avctx->extradata, s->avctx->extradata_size);
37 put_bits(&pb, 5, s->avctx->time_base.den / s->avctx->time_base.num); // yes 29.97 -> 29
38 put_bits(&pb, 11, FFMIN(s->bit_rate / 1024, 2047));
40 put_bits(&pb, 1, w->mspel_bit = 1);
41 put_bits(&pb, 1, s->loop_filter);
42 put_bits(&pb, 1, w->abt_flag = 1);
43 put_bits(&pb, 1, w->j_type_bit = 1);
44 put_bits(&pb, 1, w->top_left_mv_flag = 0);
45 put_bits(&pb, 1, w->per_mb_rl_bit = 1);
46 put_bits(&pb, 3, code = 1);
50 s->slice_height = s->mb_height / code;
55 static av_cold int wmv2_encode_init(AVCodecContext *avctx)
57 Wmv2Context *const w = avctx->priv_data;
59 if (ff_mpv_encode_init(avctx) < 0)
62 ff_wmv2_common_init(w);
64 avctx->extradata_size = 4;
65 avctx->extradata = av_mallocz(avctx->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
66 if (!avctx->extradata)
67 return AVERROR(ENOMEM);
73 int ff_wmv2_encode_picture_header(MpegEncContext *s, int picture_number)
75 Wmv2Context *const w = (Wmv2Context *) s;
77 put_bits(&s->pb, 1, s->pict_type - 1);
78 if (s->pict_type == AV_PICTURE_TYPE_I)
79 put_bits(&s->pb, 7, 0);
80 put_bits(&s->pb, 5, s->qscale);
82 s->dc_table_index = 1;
83 s->mv_table_index = 1; /* only if P frame */
84 s->per_mb_rl_table = 0;
90 av_assert0(s->flipflop_rounding);
92 if (s->pict_type == AV_PICTURE_TYPE_I) {
93 av_assert0(s->no_rounding == 1);
95 put_bits(&s->pb, 1, w->j_type);
98 put_bits(&s->pb, 1, s->per_mb_rl_table);
100 if (!s->per_mb_rl_table) {
101 ff_msmpeg4_code012(&s->pb, s->rl_chroma_table_index);
102 ff_msmpeg4_code012(&s->pb, s->rl_table_index);
105 put_bits(&s->pb, 1, s->dc_table_index);
107 s->inter_intra_pred = 0;
111 put_bits(&s->pb, 2, SKIP_TYPE_NONE);
113 ff_msmpeg4_code012(&s->pb, cbp_index = 0);
114 w->cbp_table_index = wmv2_get_cbp_table_index(s, cbp_index);
117 put_bits(&s->pb, 1, s->mspel);
120 put_bits(&s->pb, 1, w->per_mb_abt ^ 1);
122 ff_msmpeg4_code012(&s->pb, w->abt_type);
125 if (w->per_mb_rl_bit)
126 put_bits(&s->pb, 1, s->per_mb_rl_table);
128 if (!s->per_mb_rl_table) {
129 ff_msmpeg4_code012(&s->pb, s->rl_table_index);
130 s->rl_chroma_table_index = s->rl_table_index;
132 put_bits(&s->pb, 1, s->dc_table_index);
133 put_bits(&s->pb, 1, s->mv_table_index);
135 s->inter_intra_pred = 0; // (s->width * s->height < 320 * 240 && s->bit_rate <= II_BITRATE);
137 s->esc3_level_length = 0;
138 s->esc3_run_length = 0;
143 /* Nearly identical to wmv1 but that is just because we do not use the
144 * useless M$ crap features. It is duplicated here in case someone wants
145 * to add support for these crap features. */
146 void ff_wmv2_encode_mb(MpegEncContext *s, int16_t block[6][64],
147 int motion_x, int motion_y)
149 Wmv2Context *const w = (Wmv2Context *) s;
150 int cbp, coded_cbp, i;
152 uint8_t *coded_block;
154 ff_msmpeg4_handle_slices(s);
159 for (i = 0; i < 6; i++)
160 if (s->block_last_index[i] >= 0)
164 ff_wmv2_inter_table[w->cbp_table_index][cbp + 64][1],
165 ff_wmv2_inter_table[w->cbp_table_index][cbp + 64][0]);
167 s->misc_bits += get_bits_diff(s);
169 ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
170 ff_msmpeg4_encode_motion(s, motion_x - pred_x,
172 s->mv_bits += get_bits_diff(s);
177 for (i = 0; i < 6; i++) {
179 val = (s->block_last_index[i] >= 1);
180 cbp |= val << (5 - i);
182 /* predict value for close blocks only for luma */
183 pred = ff_msmpeg4_coded_block_pred(s, i, &coded_block);
187 coded_cbp |= val << (5 - i);
190 if (s->pict_type == AV_PICTURE_TYPE_I)
192 ff_msmp4_mb_i_table[coded_cbp][1],
193 ff_msmp4_mb_i_table[coded_cbp][0]);
196 ff_wmv2_inter_table[w->cbp_table_index][cbp][1],
197 ff_wmv2_inter_table[w->cbp_table_index][cbp][0]);
198 put_bits(&s->pb, 1, 0); /* no AC prediction yet */
199 if (s->inter_intra_pred) {
202 ff_table_inter_intra[s->h263_aic_dir][1],
203 ff_table_inter_intra[s->h263_aic_dir][0]);
205 s->misc_bits += get_bits_diff(s);
208 for (i = 0; i < 6; i++)
209 ff_msmpeg4_encode_block(s, block[i], i);
211 s->i_tex_bits += get_bits_diff(s);
213 s->p_tex_bits += get_bits_diff(s);
216 static const AVClass wmv2_class = {
217 .class_name = "wmv2 encoder",
218 .item_name = av_default_item_name,
219 .option = ff_mpv_generic_options,
220 .version = LIBAVUTIL_VERSION_INT,
223 AVCodec ff_wmv2_encoder = {
225 .long_name = NULL_IF_CONFIG_SMALL("Windows Media Video 8"),
226 .type = AVMEDIA_TYPE_VIDEO,
227 .id = AV_CODEC_ID_WMV2,
228 .priv_data_size = sizeof(Wmv2Context),
229 .init = wmv2_encode_init,
230 .encode2 = ff_mpv_encode_picture,
231 .close = ff_mpv_encode_end,
232 .pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV420P,
234 .priv_class = &wmv2_class,