Define AVMediaType enum, and use it instead of enum CodecType, which
[libav.git] / libavcodec / c93.c
1 /*
2 * Interplay C93 video decoder
3 * Copyright (c) 2007 Anssi Hannula <anssi.hannula@gmail.com>
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 #include "avcodec.h"
23 #include "bytestream.h"
24
25 typedef struct {
26 AVFrame pictures[2];
27 int currentpic;
28 } C93DecoderContext;
29
30 typedef enum {
31 C93_8X8_FROM_PREV = 0x02,
32 C93_4X4_FROM_PREV = 0x06,
33 C93_4X4_FROM_CURR = 0x07,
34 C93_8X8_2COLOR = 0x08,
35 C93_4X4_2COLOR = 0x0A,
36 C93_4X4_4COLOR_GRP = 0x0B,
37 C93_4X4_4COLOR = 0x0D,
38 C93_NOOP = 0x0E,
39 C93_8X8_INTRA = 0x0F,
40 } C93BlockType;
41
42 #define WIDTH 320
43 #define HEIGHT 192
44
45 #define C93_HAS_PALETTE 0x01
46 #define C93_FIRST_FRAME 0x02
47
48 static av_cold int decode_init(AVCodecContext *avctx)
49 {
50 avctx->pix_fmt = PIX_FMT_PAL8;
51 return 0;
52 }
53
54 static av_cold int decode_end(AVCodecContext *avctx)
55 {
56 C93DecoderContext * const c93 = avctx->priv_data;
57
58 if (c93->pictures[0].data[0])
59 avctx->release_buffer(avctx, &c93->pictures[0]);
60 if (c93->pictures[1].data[0])
61 avctx->release_buffer(avctx, &c93->pictures[1]);
62 return 0;
63 }
64
65 static inline int copy_block(AVCodecContext *avctx, uint8_t *to,
66 uint8_t *from, int offset, int height, int stride)
67 {
68 int i;
69 int width = height;
70 int from_x = offset % WIDTH;
71 int from_y = offset / WIDTH;
72 int overflow = from_x + width - WIDTH;
73
74 if (!from) {
75 /* silently ignoring predictive blocks in first frame */
76 return 0;
77 }
78
79 if (from_y + height > HEIGHT) {
80 av_log(avctx, AV_LOG_ERROR, "invalid offset %d during C93 decoding\n",
81 offset);
82 return -1;
83 }
84
85 if (overflow > 0) {
86 width -= overflow;
87 for (i = 0; i < height; i++) {
88 memcpy(&to[i*stride+width], &from[(from_y+i)*stride], overflow);
89 }
90 }
91
92 for (i = 0; i < height; i++) {
93 memcpy(&to[i*stride], &from[(from_y+i)*stride+from_x], width);
94 }
95
96 return 0;
97 }
98
99 static inline void draw_n_color(uint8_t *out, int stride, int width,
100 int height, int bpp, uint8_t cols[4], uint8_t grps[4], uint32_t col)
101 {
102 int x, y;
103 for (y = 0; y < height; y++) {
104 if (grps)
105 cols[0] = grps[3 * (y >> 1)];
106 for (x = 0; x < width; x++) {
107 if (grps)
108 cols[1]= grps[(x >> 1) + 1];
109 out[x + y*stride] = cols[col & ((1 << bpp) - 1)];
110 col >>= bpp;
111 }
112 }
113 }
114
115 static int decode_frame(AVCodecContext *avctx, void *data,
116 int *data_size, AVPacket *avpkt)
117 {
118 const uint8_t *buf = avpkt->data;
119 int buf_size = avpkt->size;
120 C93DecoderContext * const c93 = avctx->priv_data;
121 AVFrame * const newpic = &c93->pictures[c93->currentpic];
122 AVFrame * const oldpic = &c93->pictures[c93->currentpic^1];
123 AVFrame *picture = data;
124 uint8_t *out;
125 int stride, i, x, y, bt = 0;
126
127 c93->currentpic ^= 1;
128
129 newpic->reference = 1;
130 newpic->buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE |
131 FF_BUFFER_HINTS_REUSABLE | FF_BUFFER_HINTS_READABLE;
132 if (avctx->reget_buffer(avctx, newpic)) {
133 av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
134 return -1;
135 }
136
137 stride = newpic->linesize[0];
138
139 if (buf[0] & C93_FIRST_FRAME) {
140 newpic->pict_type = FF_I_TYPE;
141 newpic->key_frame = 1;
142 } else {
143 newpic->pict_type = FF_P_TYPE;
144 newpic->key_frame = 0;
145 }
146
147 if (*buf++ & C93_HAS_PALETTE) {
148 uint32_t *palette = (uint32_t *) newpic->data[1];
149 const uint8_t *palbuf = buf + buf_size - 768 - 1;
150 for (i = 0; i < 256; i++) {
151 palette[i] = bytestream_get_be24(&palbuf);
152 }
153 } else {
154 if (oldpic->data[1])
155 memcpy(newpic->data[1], oldpic->data[1], 256 * 4);
156 }
157
158 for (y = 0; y < HEIGHT; y += 8) {
159 out = newpic->data[0] + y * stride;
160 for (x = 0; x < WIDTH; x += 8) {
161 uint8_t *copy_from = oldpic->data[0];
162 unsigned int offset, j;
163 uint8_t cols[4], grps[4];
164 C93BlockType block_type;
165
166 if (!bt)
167 bt = *buf++;
168
169 block_type= bt & 0x0F;
170 switch (block_type) {
171 case C93_8X8_FROM_PREV:
172 offset = bytestream_get_le16(&buf);
173 if (copy_block(avctx, out, copy_from, offset, 8, stride))
174 return -1;
175 break;
176
177 case C93_4X4_FROM_CURR:
178 copy_from = newpic->data[0];
179 case C93_4X4_FROM_PREV:
180 for (j = 0; j < 8; j += 4) {
181 for (i = 0; i < 8; i += 4) {
182 offset = bytestream_get_le16(&buf);
183 if (copy_block(avctx, &out[j*stride+i],
184 copy_from, offset, 4, stride))
185 return -1;
186 }
187 }
188 break;
189
190 case C93_8X8_2COLOR:
191 bytestream_get_buffer(&buf, cols, 2);
192 for (i = 0; i < 8; i++) {
193 draw_n_color(out + i*stride, stride, 8, 1, 1, cols,
194 NULL, *buf++);
195 }
196
197 break;
198
199 case C93_4X4_2COLOR:
200 case C93_4X4_4COLOR:
201 case C93_4X4_4COLOR_GRP:
202 for (j = 0; j < 8; j += 4) {
203 for (i = 0; i < 8; i += 4) {
204 if (block_type == C93_4X4_2COLOR) {
205 bytestream_get_buffer(&buf, cols, 2);
206 draw_n_color(out + i + j*stride, stride, 4, 4,
207 1, cols, NULL, bytestream_get_le16(&buf));
208 } else if (block_type == C93_4X4_4COLOR) {
209 bytestream_get_buffer(&buf, cols, 4);
210 draw_n_color(out + i + j*stride, stride, 4, 4,
211 2, cols, NULL, bytestream_get_le32(&buf));
212 } else {
213 bytestream_get_buffer(&buf, grps, 4);
214 draw_n_color(out + i + j*stride, stride, 4, 4,
215 1, cols, grps, bytestream_get_le16(&buf));
216 }
217 }
218 }
219 break;
220
221 case C93_NOOP:
222 break;
223
224 case C93_8X8_INTRA:
225 for (j = 0; j < 8; j++)
226 bytestream_get_buffer(&buf, out + j*stride, 8);
227 break;
228
229 default:
230 av_log(avctx, AV_LOG_ERROR, "unexpected type %x at %dx%d\n",
231 block_type, x, y);
232 return -1;
233 }
234 bt >>= 4;
235 out += 8;
236 }
237 }
238
239 *picture = *newpic;
240 *data_size = sizeof(AVFrame);
241
242 return buf_size;
243 }
244
245 AVCodec c93_decoder = {
246 "c93",
247 AVMEDIA_TYPE_VIDEO,
248 CODEC_ID_C93,
249 sizeof(C93DecoderContext),
250 decode_init,
251 NULL,
252 decode_end,
253 decode_frame,
254 CODEC_CAP_DR1,
255 .long_name = NULL_IF_CONFIG_SMALL("Interplay C93"),
256 };