lavc: fix decode_frame() third parameter semantics for video decoders
[libav.git] / libavcodec / jvdec.c
1 /*
2 * Bitmap Brothers JV video decoder
3 * Copyright (c) 2011 Peter Ross <pross@xvid.org>
4 *
5 * This file is part of Libav.
6 *
7 * Libav 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 * Libav 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 Libav; 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 "avcodec.h"
29 #include "dsputil.h"
30 #include "get_bits.h"
31 #include "libavutil/intreadwrite.h"
32
33 typedef struct JvContext {
34 DSPContext dsp;
35 AVFrame frame;
36 uint32_t palette[AVPALETTE_COUNT];
37 int palette_has_changed;
38 } JvContext;
39
40 static av_cold int decode_init(AVCodecContext *avctx)
41 {
42 JvContext *s = avctx->priv_data;
43 avctx->pix_fmt = AV_PIX_FMT_PAL8;
44 ff_dsputil_init(&s->dsp, avctx);
45 return 0;
46 }
47
48 /**
49 * Decode 2x2 block
50 */
51 static inline void decode2x2(GetBitContext *gb, uint8_t *dst, int linesize)
52 {
53 int i, j, v[2];
54
55 switch (get_bits(gb, 2)) {
56 case 1:
57 v[0] = get_bits(gb, 8);
58 for (j = 0; j < 2; j++)
59 memset(dst + j*linesize, v[0], 2);
60 break;
61 case 2:
62 v[0] = get_bits(gb, 8);
63 v[1] = get_bits(gb, 8);
64 for (j = 0; j < 2; j++)
65 for (i = 0; i < 2; i++)
66 dst[j*linesize + i] = v[get_bits1(gb)];
67 break;
68 case 3:
69 for (j = 0; j < 2; j++)
70 for (i = 0; i < 2; i++)
71 dst[j*linesize + i] = get_bits(gb, 8);
72 }
73 }
74
75 /**
76 * Decode 4x4 block
77 */
78 static inline void decode4x4(GetBitContext *gb, uint8_t *dst, int linesize)
79 {
80 int i, j, v[2];
81
82 switch (get_bits(gb, 2)) {
83 case 1:
84 v[0] = get_bits(gb, 8);
85 for (j = 0; j < 4; j++)
86 memset(dst + j*linesize, v[0], 4);
87 break;
88 case 2:
89 v[0] = get_bits(gb, 8);
90 v[1] = get_bits(gb, 8);
91 for (j = 2; j >= 0; j -= 2) {
92 for (i = 0; i < 4; i++)
93 dst[j*linesize + i] = v[get_bits1(gb)];
94 for (i = 0; i < 4; i++)
95 dst[(j+1)*linesize + i] = v[get_bits1(gb)];
96 }
97 break;
98 case 3:
99 for (j = 0; j < 4; j += 2)
100 for (i = 0; i < 4; i += 2)
101 decode2x2(gb, dst + j*linesize + i, linesize);
102 }
103 }
104
105 /**
106 * Decode 8x8 block
107 */
108 static inline void decode8x8(GetBitContext *gb, uint8_t *dst, int linesize, DSPContext *dsp)
109 {
110 int i, j, v[2];
111
112 switch (get_bits(gb, 2)) {
113 case 1:
114 v[0] = get_bits(gb, 8);
115 dsp->fill_block_tab[1](dst, v[0], linesize, 8);
116 break;
117 case 2:
118 v[0] = get_bits(gb, 8);
119 v[1] = get_bits(gb, 8);
120 for (j = 7; j >= 0; j--)
121 for (i = 0; i < 8; i++)
122 dst[j*linesize + i] = v[get_bits1(gb)];
123 break;
124 case 3:
125 for (j = 0; j < 8; j += 4)
126 for (i = 0; i < 8; i += 4)
127 decode4x4(gb, dst + j*linesize + i, linesize);
128 }
129 }
130
131 static int decode_frame(AVCodecContext *avctx,
132 void *data, int *got_frame,
133 AVPacket *avpkt)
134 {
135 JvContext *s = avctx->priv_data;
136 int buf_size = avpkt->size;
137 const uint8_t *buf = avpkt->data;
138 const uint8_t *buf_end = buf + buf_size;
139 int video_size, video_type, i, j;
140
141 video_size = AV_RL32(buf);
142 video_type = buf[4];
143 buf += 5;
144
145 if (video_size) {
146 if (avctx->reget_buffer(avctx, &s->frame) < 0) {
147 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
148 return -1;
149 }
150
151 if (video_type == 0 || video_type == 1) {
152 GetBitContext gb;
153 init_get_bits(&gb, buf, 8 * FFMIN(video_size, buf_end - buf));
154
155 for (j = 0; j < avctx->height; j += 8)
156 for (i = 0; i < avctx->width; i += 8)
157 decode8x8(&gb, s->frame.data[0] + j*s->frame.linesize[0] + i,
158 s->frame.linesize[0], &s->dsp);
159
160 buf += video_size;
161 } else if (video_type == 2) {
162 if (buf + 1 <= buf_end) {
163 int v = *buf++;
164 for (j = 0; j < avctx->height; j++)
165 memset(s->frame.data[0] + j*s->frame.linesize[0], v, avctx->width);
166 }
167 } else {
168 av_log(avctx, AV_LOG_WARNING, "unsupported frame type %i\n", video_type);
169 return AVERROR_INVALIDDATA;
170 }
171 }
172
173 if (buf < buf_end) {
174 for (i = 0; i < AVPALETTE_COUNT && buf + 3 <= buf_end; i++) {
175 s->palette[i] = AV_RB24(buf) << 2;
176 buf += 3;
177 }
178 s->palette_has_changed = 1;
179 }
180
181 if (video_size) {
182 s->frame.key_frame = 1;
183 s->frame.pict_type = AV_PICTURE_TYPE_I;
184 s->frame.palette_has_changed = s->palette_has_changed;
185 s->palette_has_changed = 0;
186 memcpy(s->frame.data[1], s->palette, AVPALETTE_SIZE);
187
188 *got_frame = 1;
189 *(AVFrame*)data = s->frame;
190 }
191
192 return buf_size;
193 }
194
195 static av_cold int decode_close(AVCodecContext *avctx)
196 {
197 JvContext *s = avctx->priv_data;
198
199 if(s->frame.data[0])
200 avctx->release_buffer(avctx, &s->frame);
201
202 return 0;
203 }
204
205 AVCodec ff_jv_decoder = {
206 .name = "jv",
207 .long_name = NULL_IF_CONFIG_SMALL("Bitmap Brothers JV video"),
208 .type = AVMEDIA_TYPE_VIDEO,
209 .id = AV_CODEC_ID_JV,
210 .priv_data_size = sizeof(JvContext),
211 .init = decode_init,
212 .close = decode_close,
213 .decode = decode_frame,
214 .capabilities = CODEC_CAP_DR1,
215 };