Imported Debian version 2.5.3~trusty1
[deb_ffmpeg.git] / ffmpeg / libavcodec / jvdec.c
CommitLineData
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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 "get_bits.h"
33#include "internal.h"
34
35typedef struct JvContext {
36 BlockDSPContext bdsp;
37 AVFrame *frame;
38 uint32_t palette[AVPALETTE_COUNT];
39 int palette_has_changed;
40} JvContext;
41
42static av_cold int decode_init(AVCodecContext *avctx)
43{
44 JvContext *s = avctx->priv_data;
45
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46 if (!avctx->width || !avctx->height ||
47 (avctx->width & 7) || (avctx->height & 7)) {
48 av_log(avctx, AV_LOG_ERROR, "Invalid video dimensions: %dx%d\n",
49 avctx->width, avctx->height);
50 return AVERROR(EINVAL);
51 }
52
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53 s->frame = av_frame_alloc();
54 if (!s->frame)
55 return AVERROR(ENOMEM);
56
57 avctx->pix_fmt = AV_PIX_FMT_PAL8;
58 ff_blockdsp_init(&s->bdsp, avctx);
59 return 0;
60}
61
62/**
63 * Decode 2x2 block
64 */
65static inline void decode2x2(GetBitContext *gb, uint8_t *dst, int linesize)
66{
67 int i, j, v[2];
68
69 switch (get_bits(gb, 2)) {
70 case 1:
71 v[0] = get_bits(gb, 8);
72 for (j = 0; j < 2; j++)
73 memset(dst + j * linesize, v[0], 2);
74 break;
75 case 2:
76 v[0] = get_bits(gb, 8);
77 v[1] = get_bits(gb, 8);
78 for (j = 0; j < 2; j++)
79 for (i = 0; i < 2; i++)
80 dst[j * linesize + i] = v[get_bits1(gb)];
81 break;
82 case 3:
83 for (j = 0; j < 2; j++)
84 for (i = 0; i < 2; i++)
85 dst[j * linesize + i] = get_bits(gb, 8);
86 }
87}
88
89/**
90 * Decode 4x4 block
91 */
92static inline void decode4x4(GetBitContext *gb, uint8_t *dst, int linesize)
93{
94 int i, j, v[2];
95
96 switch (get_bits(gb, 2)) {
97 case 1:
98 v[0] = get_bits(gb, 8);
99 for (j = 0; j < 4; j++)
100 memset(dst + j * linesize, v[0], 4);
101 break;
102 case 2:
103 v[0] = get_bits(gb, 8);
104 v[1] = get_bits(gb, 8);
105 for (j = 2; j >= 0; j -= 2) {
106 for (i = 0; i < 4; i++)
107 dst[j * linesize + i] = v[get_bits1(gb)];
108 for (i = 0; i < 4; i++)
109 dst[(j + 1) * linesize + i] = v[get_bits1(gb)];
110 }
111 break;
112 case 3:
113 for (j = 0; j < 4; j += 2)
114 for (i = 0; i < 4; i += 2)
115 decode2x2(gb, dst + j * linesize + i, linesize);
116 }
117}
118
119/**
120 * Decode 8x8 block
121 */
122static inline void decode8x8(GetBitContext *gb, uint8_t *dst, int linesize,
123 BlockDSPContext *bdsp)
124{
125 int i, j, v[2];
126
127 switch (get_bits(gb, 2)) {
128 case 1:
129 v[0] = get_bits(gb, 8);
130 bdsp->fill_block_tab[1](dst, v[0], linesize, 8);
131 break;
132 case 2:
133 v[0] = get_bits(gb, 8);
134 v[1] = get_bits(gb, 8);
135 for (j = 7; j >= 0; j--)
136 for (i = 0; i < 8; i++)
137 dst[j * linesize + i] = v[get_bits1(gb)];
138 break;
139 case 3:
140 for (j = 0; j < 8; j += 4)
141 for (i = 0; i < 8; i += 4)
142 decode4x4(gb, dst + j * linesize + i, linesize);
143 }
144}
145
146static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
147 AVPacket *avpkt)
148{
149 JvContext *s = avctx->priv_data;
150 const uint8_t *buf = avpkt->data;
151 const uint8_t *buf_end = buf + avpkt->size;
152 int video_size, video_type, i, j, ret;
153
154 if (avpkt->size < 6)
155 return AVERROR_INVALIDDATA;
156
157 video_size = AV_RL32(buf);
158 video_type = buf[4];
159 buf += 5;
160
161 if (video_size) {
162 if (video_size < 0 || video_size > avpkt->size - 5) {
163 av_log(avctx, AV_LOG_ERROR, "video size %d invalid\n", video_size);
164 return AVERROR_INVALIDDATA;
165 }
166 if ((ret = ff_reget_buffer(avctx, s->frame)) < 0)
167 return ret;
168
169 if (video_type == 0 || video_type == 1) {
170 GetBitContext gb;
171 init_get_bits(&gb, buf, 8 * video_size);
172
173 for (j = 0; j < avctx->height; j += 8)
174 for (i = 0; i < avctx->width; i += 8)
175 decode8x8(&gb,
176 s->frame->data[0] + j * s->frame->linesize[0] + i,
177 s->frame->linesize[0], &s->bdsp);
178
179 buf += video_size;
180 } else if (video_type == 2) {
181 int v = *buf++;
182 for (j = 0; j < avctx->height; j++)
183 memset(s->frame->data[0] + j * s->frame->linesize[0],
184 v, avctx->width);
185 } else {
186 av_log(avctx, AV_LOG_WARNING,
187 "unsupported frame type %i\n", video_type);
188 return AVERROR_INVALIDDATA;
189 }
190 }
191
192 if (buf_end - buf >= AVPALETTE_COUNT * 3) {
193 for (i = 0; i < AVPALETTE_COUNT; i++) {
194 uint32_t pal = AV_RB24(buf);
195 s->palette[i] = 0xFFU << 24 | pal << 2 | ((pal >> 4) & 0x30303);
196 buf += 3;
197 }
198 s->palette_has_changed = 1;
199 }
200
201 if (video_size) {
202 s->frame->key_frame = 1;
203 s->frame->pict_type = AV_PICTURE_TYPE_I;
204 s->frame->palette_has_changed = s->palette_has_changed;
205 s->palette_has_changed = 0;
206 memcpy(s->frame->data[1], s->palette, AVPALETTE_SIZE);
207
208 if ((ret = av_frame_ref(data, s->frame)) < 0)
209 return ret;
210 *got_frame = 1;
211 }
212
213 return avpkt->size;
214}
215
216static av_cold int decode_close(AVCodecContext *avctx)
217{
218 JvContext *s = avctx->priv_data;
219
220 av_frame_free(&s->frame);
221
222 return 0;
223}
224
225AVCodec ff_jv_decoder = {
226 .name = "jv",
227 .long_name = NULL_IF_CONFIG_SMALL("Bitmap Brothers JV video"),
228 .type = AVMEDIA_TYPE_VIDEO,
229 .id = AV_CODEC_ID_JV,
230 .priv_data_size = sizeof(JvContext),
231 .init = decode_init,
232 .close = decode_close,
233 .decode = decode_frame,
234 .capabilities = CODEC_CAP_DR1,
235};