1 /*
2 * Bitmap Brothers JV video decoder
3 * Copyright (c) 2011 Peter Ross <pross@xvid.org>
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 /**
23 * @file
24 * Bitmap Brothers JV video decoder
25 * @author Peter Ross <pross@xvid.org>
26 */
27
28 #include "libavutil/intreadwrite.h"
29
30 #include "avcodec.h"
31 #include "blockdsp.h"
32 #include "codec_internal.h"
33 #include "get_bits.h"
34 #include "internal.h"
35
36 typedef struct JvContext {
37 BlockDSPContext bdsp;
38 AVFrame *frame;
39 uint32_t palette[AVPALETTE_COUNT];
40 int palette_has_changed;
41 } JvContext;
42
decode_init(AVCodecContext * avctx)43 static av_cold int decode_init(AVCodecContext *avctx)
44 {
45 JvContext *s = avctx->priv_data;
46
47 if (!avctx->width || !avctx->height ||
48 (avctx->width & 7) || (avctx->height & 7)) {
49 av_log(avctx, AV_LOG_ERROR, "Invalid video dimensions: %dx%d\n",
50 avctx->width, avctx->height);
51 return AVERROR(EINVAL);
52 }
53
54 s->frame = av_frame_alloc();
55 if (!s->frame)
56 return AVERROR(ENOMEM);
57
58 avctx->pix_fmt = AV_PIX_FMT_PAL8;
59 ff_blockdsp_init(&s->bdsp, avctx);
60 return 0;
61 }
62
63 /**
64 * Decode 2x2 block
65 */
decode2x2(GetBitContext * gb,uint8_t * dst,int linesize)66 static inline void decode2x2(GetBitContext *gb, uint8_t *dst, int linesize)
67 {
68 int i, j, v[2];
69
70 switch (get_bits(gb, 2)) {
71 case 1:
72 v[0] = get_bits(gb, 8);
73 for (j = 0; j < 2; j++)
74 memset(dst + j * linesize, v[0], 2);
75 break;
76 case 2:
77 v[0] = get_bits(gb, 8);
78 v[1] = get_bits(gb, 8);
79 for (j = 0; j < 2; j++)
80 for (i = 0; i < 2; i++)
81 dst[j * linesize + i] = v[get_bits1(gb)];
82 break;
83 case 3:
84 for (j = 0; j < 2; j++)
85 for (i = 0; i < 2; i++)
86 dst[j * linesize + i] = get_bits(gb, 8);
87 }
88 }
89
90 /**
91 * Decode 4x4 block
92 */
decode4x4(GetBitContext * gb,uint8_t * dst,int linesize)93 static inline void decode4x4(GetBitContext *gb, uint8_t *dst, int linesize)
94 {
95 int i, j, v[2];
96
97 switch (get_bits(gb, 2)) {
98 case 1:
99 v[0] = get_bits(gb, 8);
100 for (j = 0; j < 4; j++)
101 memset(dst + j * linesize, v[0], 4);
102 break;
103 case 2:
104 v[0] = get_bits(gb, 8);
105 v[1] = get_bits(gb, 8);
106 for (j = 2; j >= 0; j -= 2) {
107 for (i = 0; i < 4; i++)
108 dst[j * linesize + i] = v[get_bits1(gb)];
109 for (i = 0; i < 4; i++)
110 dst[(j + 1) * linesize + i] = v[get_bits1(gb)];
111 }
112 break;
113 case 3:
114 for (j = 0; j < 4; j += 2)
115 for (i = 0; i < 4; i += 2)
116 decode2x2(gb, dst + j * linesize + i, linesize);
117 }
118 }
119
120 /**
121 * Decode 8x8 block
122 */
decode8x8(GetBitContext * gb,uint8_t * dst,int linesize,BlockDSPContext * bdsp)123 static inline void decode8x8(GetBitContext *gb, uint8_t *dst, int linesize,
124 BlockDSPContext *bdsp)
125 {
126 int i, j, v[2];
127
128 switch (get_bits(gb, 2)) {
129 case 1:
130 v[0] = get_bits(gb, 8);
131 bdsp->fill_block_tab[1](dst, v[0], linesize, 8);
132 break;
133 case 2:
134 v[0] = get_bits(gb, 8);
135 v[1] = get_bits(gb, 8);
136 for (j = 7; j >= 0; j--)
137 for (i = 0; i < 8; i++)
138 dst[j * linesize + i] = v[get_bits1(gb)];
139 break;
140 case 3:
141 for (j = 0; j < 8; j += 4)
142 for (i = 0; i < 8; i += 4)
143 decode4x4(gb, dst + j * linesize + i, linesize);
144 }
145 }
146
decode_frame(AVCodecContext * avctx,AVFrame * rframe,int * got_frame,AVPacket * avpkt)147 static int decode_frame(AVCodecContext *avctx, AVFrame *rframe,
148 int *got_frame, AVPacket *avpkt)
149 {
150 JvContext *s = avctx->priv_data;
151 const uint8_t *buf = avpkt->data;
152 const uint8_t *buf_end = buf + avpkt->size;
153 int video_size, video_type, i, j, ret;
154
155 if (avpkt->size < 6)
156 return AVERROR_INVALIDDATA;
157
158 video_size = AV_RL32(buf);
159 video_type = buf[4];
160 buf += 5;
161
162 if (video_size) {
163 if (video_size < 0 || video_size > avpkt->size - 5) {
164 av_log(avctx, AV_LOG_ERROR, "video size %d invalid\n", video_size);
165 return AVERROR_INVALIDDATA;
166 }
167
168 if (video_type == 0 || video_type == 1) {
169 GetBitContext gb;
170 init_get_bits(&gb, buf, 8 * video_size);
171
172 if ((ret = ff_reget_buffer(avctx, s->frame, 0)) < 0)
173 return ret;
174
175 if (avctx->height/8 * (avctx->width/8) > 4 * video_size) {
176 av_log(avctx, AV_LOG_ERROR, "Insufficient input data for dimensions\n");
177 return AVERROR_INVALIDDATA;
178 }
179
180 for (j = 0; j < avctx->height; j += 8)
181 for (i = 0; i < avctx->width; i += 8)
182 decode8x8(&gb,
183 s->frame->data[0] + j * s->frame->linesize[0] + i,
184 s->frame->linesize[0], &s->bdsp);
185
186 buf += video_size;
187 } else if (video_type == 2) {
188 int v = *buf++;
189
190 av_frame_unref(s->frame);
191 if ((ret = ff_get_buffer(avctx, s->frame, AV_GET_BUFFER_FLAG_REF)) < 0)
192 return ret;
193
194 for (j = 0; j < avctx->height; j++)
195 memset(s->frame->data[0] + j * s->frame->linesize[0],
196 v, avctx->width);
197 } else {
198 av_log(avctx, AV_LOG_WARNING,
199 "unsupported frame type %i\n", video_type);
200 return AVERROR_INVALIDDATA;
201 }
202 }
203
204 if (buf_end - buf >= AVPALETTE_COUNT * 3) {
205 for (i = 0; i < AVPALETTE_COUNT; i++) {
206 uint32_t pal = AV_RB24(buf);
207 s->palette[i] = 0xFFU << 24 | pal << 2 | ((pal >> 4) & 0x30303);
208 buf += 3;
209 }
210 s->palette_has_changed = 1;
211 }
212
213 if (video_size) {
214 s->frame->key_frame = 1;
215 s->frame->pict_type = AV_PICTURE_TYPE_I;
216 s->frame->palette_has_changed = s->palette_has_changed;
217 s->palette_has_changed = 0;
218 memcpy(s->frame->data[1], s->palette, AVPALETTE_SIZE);
219
220 if ((ret = av_frame_ref(rframe, s->frame)) < 0)
221 return ret;
222 *got_frame = 1;
223 }
224
225 return avpkt->size;
226 }
227
decode_close(AVCodecContext * avctx)228 static av_cold int decode_close(AVCodecContext *avctx)
229 {
230 JvContext *s = avctx->priv_data;
231
232 av_frame_free(&s->frame);
233
234 return 0;
235 }
236
237 const FFCodec ff_jv_decoder = {
238 .p.name = "jv",
239 .p.long_name = NULL_IF_CONFIG_SMALL("Bitmap Brothers JV video"),
240 .p.type = AVMEDIA_TYPE_VIDEO,
241 .p.id = AV_CODEC_ID_JV,
242 .priv_data_size = sizeof(JvContext),
243 .init = decode_init,
244 .close = decode_close,
245 FF_CODEC_DECODE_CB(decode_frame),
246 .p.capabilities = AV_CODEC_CAP_DR1,
247 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
248 };
249