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 + AV_INPUT_BUFFER_PADDING_SIZE);
66 if (!avctx->extradata)
67 return AVERROR(ENOMEM);
74 int ff_wmv2_encode_picture_header(MpegEncContext *s, int picture_number)
76 Wmv2Context *const w = (Wmv2Context *) s;
78 put_bits(&s->pb, 1, s->pict_type - 1);
79 if (s->pict_type == AV_PICTURE_TYPE_I)
80 put_bits(&s->pb, 7, 0);
81 put_bits(&s->pb, 5, s->qscale);
83 s->dc_table_index = 1;
84 s->mv_table_index = 1; /* only if P-frame */
85 s->per_mb_rl_table = 0;
91 av_assert0(s->flipflop_rounding);
93 if (s->pict_type == AV_PICTURE_TYPE_I) {
94 av_assert0(s->no_rounding == 1);
96 put_bits(&s->pb, 1, w->j_type);
99 put_bits(&s->pb, 1, s->per_mb_rl_table);
101 if (!s->per_mb_rl_table) {
102 ff_msmpeg4_code012(&s->pb, s->rl_chroma_table_index);
103 ff_msmpeg4_code012(&s->pb, s->rl_table_index);
106 put_bits(&s->pb, 1, s->dc_table_index);
108 s->inter_intra_pred = 0;
112 put_bits(&s->pb, 2, SKIP_TYPE_NONE);
114 ff_msmpeg4_code012(&s->pb, cbp_index = 0);
115 w->cbp_table_index = wmv2_get_cbp_table_index(s, cbp_index);
118 put_bits(&s->pb, 1, s->mspel);
121 put_bits(&s->pb, 1, w->per_mb_abt ^ 1);
123 ff_msmpeg4_code012(&s->pb, w->abt_type);
126 if (w->per_mb_rl_bit)
127 put_bits(&s->pb, 1, s->per_mb_rl_table);
129 if (!s->per_mb_rl_table) {
130 ff_msmpeg4_code012(&s->pb, s->rl_table_index);
131 s->rl_chroma_table_index = s->rl_table_index;
133 put_bits(&s->pb, 1, s->dc_table_index);
134 put_bits(&s->pb, 1, s->mv_table_index);
136 s->inter_intra_pred = 0; // (s->width * s->height < 320 * 240 && s->bit_rate <= II_BITRATE);
138 s->esc3_level_length = 0;
139 s->esc3_run_length = 0;
144 /* Nearly identical to wmv1 but that is just because we do not use the
145 * useless M$ crap features. It is duplicated here in case someone wants
146 * to add support for these crap features. */
147 void ff_wmv2_encode_mb(MpegEncContext *s, int16_t block[6][64],
148 int motion_x, int motion_y)
150 Wmv2Context *const w = (Wmv2Context *) s;
151 int cbp, coded_cbp, i;
153 uint8_t *coded_block;
155 ff_msmpeg4_handle_slices(s);
160 for (i = 0; i < 6; i++)
161 if (s->block_last_index[i] >= 0)
165 ff_wmv2_inter_table[w->cbp_table_index][cbp + 64][1],
166 ff_wmv2_inter_table[w->cbp_table_index][cbp + 64][0]);
168 s->misc_bits += get_bits_diff(s);
170 ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
171 ff_msmpeg4_encode_motion(s, motion_x - pred_x,
173 s->mv_bits += get_bits_diff(s);
178 for (i = 0; i < 6; i++) {
180 val = (s->block_last_index[i] >= 1);
181 cbp |= val << (5 - i);
183 /* predict value for close blocks only for luma */
184 pred = ff_msmpeg4_coded_block_pred(s, i, &coded_block);
188 coded_cbp |= val << (5 - i);
191 if (s->pict_type == AV_PICTURE_TYPE_I)
193 ff_msmp4_mb_i_table[coded_cbp][1],
194 ff_msmp4_mb_i_table[coded_cbp][0]);
197 ff_wmv2_inter_table[w->cbp_table_index][cbp][1],
198 ff_wmv2_inter_table[w->cbp_table_index][cbp][0]);
199 put_bits(&s->pb, 1, 0); /* no AC prediction yet */
200 if (s->inter_intra_pred) {
203 ff_table_inter_intra[s->h263_aic_dir][1],
204 ff_table_inter_intra[s->h263_aic_dir][0]);
206 s->misc_bits += get_bits_diff(s);
209 for (i = 0; i < 6; i++)
210 ff_msmpeg4_encode_block(s, block[i], i);
212 s->i_tex_bits += get_bits_diff(s);
214 s->p_tex_bits += get_bits_diff(s);
217 static const AVClass wmv2_class = {
218 .class_name = "wmv2 encoder",
219 .item_name = av_default_item_name,
220 .option = ff_mpv_generic_options,
221 .version = LIBAVUTIL_VERSION_INT,
224 AVCodec ff_wmv2_encoder = {
226 .long_name = NULL_IF_CONFIG_SMALL("Windows Media Video 8"),
227 .type = AVMEDIA_TYPE_VIDEO,
228 .id = AV_CODEC_ID_WMV2,
229 .priv_data_size = sizeof(Wmv2Context),
230 .priv_class = &wmv2_class,
231 .init = wmv2_encode_init,
232 .encode2 = ff_mpv_encode_picture,
233 .close = ff_mpv_encode_end,
234 .pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV420P,