1 /*
2 * Copyright (c) 2002 The FFmpeg Project
3 *
4 * This file is part of FFmpeg.
5 *
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.
10 *
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.
15 *
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
19 */
20
21 #include "avcodec.h"
22 #include "codec_internal.h"
23 #include "h263.h"
24 #include "mpegvideo.h"
25 #include "mpegvideoenc.h"
26 #include "msmpeg4.h"
27 #include "msmpeg4enc.h"
28 #include "msmpeg4data.h"
29 #include "wmv2.h"
30 #include "wmv2enc.h"
31
32 typedef struct WMV2EncContext {
33 MSMPEG4EncContext msmpeg4;
34 WMV2Context common;
35 int j_type_bit;
36 int j_type;
37 int abt_flag;
38 int abt_type;
39 int per_mb_abt;
40 int mspel_bit;
41 int cbp_table_index;
42 int top_left_mv_flag;
43 int per_mb_rl_bit;
44 } WMV2EncContext;
45
encode_ext_header(WMV2EncContext * w)46 static int encode_ext_header(WMV2EncContext *w)
47 {
48 MpegEncContext *const s = &w->msmpeg4.s;
49 PutBitContext pb;
50 int code;
51
52 init_put_bits(&pb, s->avctx->extradata, s->avctx->extradata_size);
53
54 put_bits(&pb, 5, s->avctx->time_base.den / s->avctx->time_base.num); // yes 29.97 -> 29
55 put_bits(&pb, 11, FFMIN(s->bit_rate / 1024, 2047));
56
57 put_bits(&pb, 1, w->mspel_bit = 1);
58 put_bits(&pb, 1, s->loop_filter);
59 put_bits(&pb, 1, w->abt_flag = 1);
60 put_bits(&pb, 1, w->j_type_bit = 1);
61 put_bits(&pb, 1, w->top_left_mv_flag = 0);
62 put_bits(&pb, 1, w->per_mb_rl_bit = 1);
63 put_bits(&pb, 3, code = 1);
64
65 flush_put_bits(&pb);
66
67 s->slice_height = s->mb_height / code;
68
69 return 0;
70 }
71
wmv2_encode_init(AVCodecContext * avctx)72 static av_cold int wmv2_encode_init(AVCodecContext *avctx)
73 {
74 WMV2EncContext *const w = avctx->priv_data;
75 MpegEncContext *const s = &w->msmpeg4.s;
76
77 s->private_ctx = &w->common;
78 if (ff_mpv_encode_init(avctx) < 0)
79 return -1;
80
81 ff_wmv2_common_init(s);
82
83 avctx->extradata_size = 4;
84 avctx->extradata = av_mallocz(avctx->extradata_size + AV_INPUT_BUFFER_PADDING_SIZE);
85 if (!avctx->extradata)
86 return AVERROR(ENOMEM);
87
88 encode_ext_header(w);
89
90 return 0;
91 }
92
ff_wmv2_encode_picture_header(MpegEncContext * s,int picture_number)93 int ff_wmv2_encode_picture_header(MpegEncContext *s, int picture_number)
94 {
95 WMV2EncContext *const w = (WMV2EncContext *) s;
96
97 put_bits(&s->pb, 1, s->pict_type - 1);
98 if (s->pict_type == AV_PICTURE_TYPE_I)
99 put_bits(&s->pb, 7, 0);
100 put_bits(&s->pb, 5, s->qscale);
101
102 s->dc_table_index = 1;
103 s->mv_table_index = 1; /* only if P-frame */
104 s->per_mb_rl_table = 0;
105 s->mspel = 0;
106 w->per_mb_abt = 0;
107 w->abt_type = 0;
108 w->j_type = 0;
109
110 av_assert0(s->flipflop_rounding);
111
112 if (s->pict_type == AV_PICTURE_TYPE_I) {
113 av_assert0(s->no_rounding == 1);
114 if (w->j_type_bit)
115 put_bits(&s->pb, 1, w->j_type);
116
117 if (w->per_mb_rl_bit)
118 put_bits(&s->pb, 1, s->per_mb_rl_table);
119
120 if (!s->per_mb_rl_table) {
121 ff_msmpeg4_code012(&s->pb, s->rl_chroma_table_index);
122 ff_msmpeg4_code012(&s->pb, s->rl_table_index);
123 }
124
125 put_bits(&s->pb, 1, s->dc_table_index);
126
127 s->inter_intra_pred = 0;
128 } else {
129 int cbp_index;
130
131 put_bits(&s->pb, 2, SKIP_TYPE_NONE);
132
133 ff_msmpeg4_code012(&s->pb, cbp_index = 0);
134 w->cbp_table_index = wmv2_get_cbp_table_index(s, cbp_index);
135
136 if (w->mspel_bit)
137 put_bits(&s->pb, 1, s->mspel);
138
139 if (w->abt_flag) {
140 put_bits(&s->pb, 1, w->per_mb_abt ^ 1);
141 if (!w->per_mb_abt)
142 ff_msmpeg4_code012(&s->pb, w->abt_type);
143 }
144
145 if (w->per_mb_rl_bit)
146 put_bits(&s->pb, 1, s->per_mb_rl_table);
147
148 if (!s->per_mb_rl_table) {
149 ff_msmpeg4_code012(&s->pb, s->rl_table_index);
150 s->rl_chroma_table_index = s->rl_table_index;
151 }
152 put_bits(&s->pb, 1, s->dc_table_index);
153 put_bits(&s->pb, 1, s->mv_table_index);
154
155 s->inter_intra_pred = 0; // (s->width * s->height < 320 * 240 && s->bit_rate <= II_BITRATE);
156 }
157 s->esc3_level_length = 0;
158 s->esc3_run_length = 0;
159
160 return 0;
161 }
162
163 /* Nearly identical to wmv1 but that is just because we do not use the
164 * useless M$ crap features. It is duplicated here in case someone wants
165 * to add support for these crap features. */
ff_wmv2_encode_mb(MpegEncContext * s,int16_t block[6][64],int motion_x,int motion_y)166 void ff_wmv2_encode_mb(MpegEncContext *s, int16_t block[6][64],
167 int motion_x, int motion_y)
168 {
169 WMV2EncContext *const w = (WMV2EncContext *) s;
170 int cbp, coded_cbp, i;
171 int pred_x, pred_y;
172 uint8_t *coded_block;
173
174 ff_msmpeg4_handle_slices(s);
175
176 if (!s->mb_intra) {
177 /* compute cbp */
178 cbp = 0;
179 for (i = 0; i < 6; i++)
180 if (s->block_last_index[i] >= 0)
181 cbp |= 1 << (5 - i);
182
183 put_bits(&s->pb,
184 ff_wmv2_inter_table[w->cbp_table_index][cbp + 64][1],
185 ff_wmv2_inter_table[w->cbp_table_index][cbp + 64][0]);
186
187 s->misc_bits += get_bits_diff(s);
188 /* motion vector */
189 ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
190 ff_msmpeg4_encode_motion(s, motion_x - pred_x,
191 motion_y - pred_y);
192 s->mv_bits += get_bits_diff(s);
193 } else {
194 /* compute cbp */
195 cbp = 0;
196 coded_cbp = 0;
197 for (i = 0; i < 6; i++) {
198 int val, pred;
199 val = (s->block_last_index[i] >= 1);
200 cbp |= val << (5 - i);
201 if (i < 4) {
202 /* predict value for close blocks only for luma */
203 pred = ff_msmpeg4_coded_block_pred(s, i, &coded_block);
204 *coded_block = val;
205 val = val ^ pred;
206 }
207 coded_cbp |= val << (5 - i);
208 }
209
210 if (s->pict_type == AV_PICTURE_TYPE_I)
211 put_bits(&s->pb,
212 ff_msmp4_mb_i_table[coded_cbp][1],
213 ff_msmp4_mb_i_table[coded_cbp][0]);
214 else
215 put_bits(&s->pb,
216 ff_wmv2_inter_table[w->cbp_table_index][cbp][1],
217 ff_wmv2_inter_table[w->cbp_table_index][cbp][0]);
218 put_bits(&s->pb, 1, 0); /* no AC prediction yet */
219 if (s->inter_intra_pred) {
220 s->h263_aic_dir = 0;
221 put_bits(&s->pb,
222 ff_table_inter_intra[s->h263_aic_dir][1],
223 ff_table_inter_intra[s->h263_aic_dir][0]);
224 }
225 s->misc_bits += get_bits_diff(s);
226 }
227
228 for (i = 0; i < 6; i++)
229 ff_msmpeg4_encode_block(s, block[i], i);
230 if (s->mb_intra)
231 s->i_tex_bits += get_bits_diff(s);
232 else
233 s->p_tex_bits += get_bits_diff(s);
234 }
235
236 const FFCodec ff_wmv2_encoder = {
237 .p.name = "wmv2",
238 .p.long_name = NULL_IF_CONFIG_SMALL("Windows Media Video 8"),
239 .p.type = AVMEDIA_TYPE_VIDEO,
240 .p.id = AV_CODEC_ID_WMV2,
241 .p.priv_class = &ff_mpv_enc_class,
242 .priv_data_size = sizeof(WMV2EncContext),
243 .init = wmv2_encode_init,
244 FF_CODEC_ENCODE_CB(ff_mpv_encode_picture),
245 .close = ff_mpv_encode_end,
246 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP,
247 .p.pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV420P,
248 AV_PIX_FMT_NONE },
249 };
250