New demuxers: Sega FILM/CPK, Westwood VQA & AUD; new decoders: MS RLE &
[libav.git] / libavcodec / rpza.c
1 /*
2 * Quicktime Video (RPZA) Video Decoder
3 * Copyright (C) 2003 the ffmpeg project
4 *
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
9 *
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
14 *
15 * You should have received a copy of the GNU Lesser General Public
16 * License along with this library; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 *
19 */
20
21 /**
22 * @file rpza.c
23 * QT RPZA Video Decoder by Roberto Togni <rtogni@bresciaonline.it>
24 * For more information about the RPZA format, visit:
25 * http://www.pcisys.net/~melanson/codecs/
26 *
27 * The RPZA decoder outputs RGB555 colorspace data.
28 *
29 * Note that this decoder reads big endian RGB555 pixel values from the
30 * bytestream, arranges them in the host's endian order, and outputs
31 * them to the final rendered map in the same host endian order. This is
32 * intended behavior as the ffmpeg documentation states that RGB555 pixels
33 * shall be stored in native CPU endianness.
34 */
35
36 #include <stdio.h>
37 #include <stdlib.h>
38 #include <string.h>
39 #include <unistd.h>
40
41 #include "common.h"
42 #include "avcodec.h"
43 #include "dsputil.h"
44
45 typedef struct RpzaContext {
46
47 AVCodecContext *avctx;
48 DSPContext dsp;
49 AVFrame frame;
50 AVFrame prev_frame;
51
52 unsigned char *buf;
53 int size;
54
55 } RpzaContext;
56
57 #define BE_16(x) ((((uint8_t*)(x))[0] << 8) | ((uint8_t*)(x))[1])
58 #define BE_32(x) ((((uint8_t*)(x))[0] << 24) | \
59 (((uint8_t*)(x))[1] << 16) | \
60 (((uint8_t*)(x))[2] << 8) | \
61 ((uint8_t*)(x))[3])
62
63 #define ADVANCE_BLOCK() \
64 { \
65 pixel_ptr += 4; \
66 if (pixel_ptr >= width) \
67 { \
68 pixel_ptr = 0; \
69 row_ptr += stride * 4; \
70 } \
71 total_blocks--; \
72 if (total_blocks < 0) \
73 { \
74 printf("warning: block counter just went negative (this should not happen)\n"); \
75 return; \
76 } \
77 }
78
79 static void rpza_decode_stream(RpzaContext *s)
80 {
81 int width = s->avctx->width;
82 int stride = s->frame.linesize[0] / 2;
83 int row_inc = stride - 4;
84 int stream_ptr = 0;
85 int chunk_size;
86 unsigned char opcode;
87 int n_blocks;
88 unsigned short colorA = 0, colorB;
89 unsigned short color4[4];
90 unsigned char index, idx;
91 unsigned short ta, tb;
92 unsigned short *pixels = (unsigned short *)s->frame.data[0];
93 unsigned short *prev_pixels = (unsigned short *)s->prev_frame.data[0];
94
95 int row_ptr = 0;
96 int pixel_ptr = 0;
97 int block_ptr;
98 int pixel_x, pixel_y;
99 int total_blocks;
100
101 /* First byte is always 0xe1. Warn if it's different */
102 if (s->buf[stream_ptr] != 0xe1)
103 printf("First chunk byte is 0x%02x instead of 0x1e\n",
104 s->buf[stream_ptr]);
105
106 /* Get chunk size, ingnoring first byte */
107 chunk_size = BE_32(&s->buf[stream_ptr]) & 0x00FFFFFF;
108 stream_ptr += 4;
109
110 /* If length mismatch use size from MOV file and try to decode anyway */
111 if (chunk_size != s->size)
112 printf("MOV chunk size != encoded chunk size; using MOV chunk size\n");
113
114 chunk_size = s->size;
115
116 /* Number of 4x4 blocks in frame. */
117 total_blocks = (s->avctx->width * s->avctx->height) / (4 * 4);
118
119 /* Process chunk data */
120 while (stream_ptr < chunk_size) {
121 opcode = s->buf[stream_ptr++]; /* Get opcode */
122
123 n_blocks = (opcode & 0x1f) + 1; /* Extract block counter from opcode */
124
125 /* If opcode MSbit is 0, we need more data to decide what to do */
126 if ((opcode & 0x80) == 0) {
127 colorA = (opcode << 8) | (s->buf[stream_ptr++]);
128 opcode = 0;
129 if ((s->buf[stream_ptr] & 0x80) != 0) {
130 /* Must behave as opcode 110xxxxx, using colorA computed
131 * above. Use fake opcode 0x20 to enter switch block at
132 * the right place */
133 opcode = 0x20;
134 n_blocks = 1;
135 }
136 }
137
138 switch (opcode & 0xe0) {
139
140 /* Skip blocks */
141 case 0x80:
142 while (n_blocks--) {
143 block_ptr = row_ptr + pixel_ptr;
144 for (pixel_y = 0; pixel_y < 4; pixel_y++) {
145 for (pixel_x = 0; pixel_x < 4; pixel_x++){
146 pixels[block_ptr] = prev_pixels[block_ptr];
147 block_ptr++;
148 }
149 block_ptr += row_inc;
150 }
151 ADVANCE_BLOCK();
152 }
153 break;
154
155 /* Fill blocks with one color */
156 case 0xa0:
157 colorA = BE_16 (&s->buf[stream_ptr]);
158 stream_ptr += 2;
159 while (n_blocks--) {
160 block_ptr = row_ptr + pixel_ptr;
161 for (pixel_y = 0; pixel_y < 4; pixel_y++) {
162 for (pixel_x = 0; pixel_x < 4; pixel_x++){
163 pixels[block_ptr] = colorA;
164 block_ptr++;
165 }
166 block_ptr += row_inc;
167 }
168 ADVANCE_BLOCK();
169 }
170 break;
171
172 /* Fill blocks with 4 colors */
173 case 0xc0:
174 colorA = BE_16 (&s->buf[stream_ptr]);
175 stream_ptr += 2;
176 case 0x20:
177 colorB = BE_16 (&s->buf[stream_ptr]);
178 stream_ptr += 2;
179
180 /* sort out the colors */
181 color4[0] = colorB;
182 color4[1] = 0;
183 color4[2] = 0;
184 color4[3] = colorA;
185
186 /* red components */
187 ta = (colorA >> 10) & 0x1F;
188 tb = (colorB >> 10) & 0x1F;
189 color4[1] |= ((11 * ta + 21 * tb) >> 5) << 10;
190 color4[2] |= ((21 * ta + 11 * tb) >> 5) << 10;
191
192 /* green components */
193 ta = (colorA >> 5) & 0x1F;
194 tb = (colorB >> 5) & 0x1F;
195 color4[1] |= ((11 * ta + 21 * tb) >> 5) << 5;
196 color4[2] |= ((21 * ta + 11 * tb) >> 5) << 5;
197
198 /* blue components */
199 ta = colorA & 0x1F;
200 tb = colorB & 0x1F;
201 color4[1] |= ((11 * ta + 21 * tb) >> 5);
202 color4[2] |= ((21 * ta + 11 * tb) >> 5);
203
204 while (n_blocks--) {
205 block_ptr = row_ptr + pixel_ptr;
206 for (pixel_y = 0; pixel_y < 4; pixel_y++) {
207 index = s->buf[stream_ptr++];
208 for (pixel_x = 0; pixel_x < 4; pixel_x++){
209 idx = (index >> (2 * (3 - pixel_x))) & 0x03;
210 pixels[block_ptr] = color4[idx];
211 block_ptr++;
212 }
213 block_ptr += row_inc;
214 }
215 ADVANCE_BLOCK();
216 }
217 break;
218
219 /* Fill block with 16 colors */
220 case 0x00:
221 block_ptr = row_ptr + pixel_ptr;
222 for (pixel_y = 0; pixel_y < 4; pixel_y++) {
223 for (pixel_x = 0; pixel_x < 4; pixel_x++){
224 /* We already have color of upper left pixel */
225 if ((pixel_y != 0) || (pixel_x !=0)) {
226 colorA = BE_16 (&s->buf[stream_ptr]);
227 stream_ptr += 2;
228 }
229 pixels[block_ptr] = colorA;
230 block_ptr++;
231 }
232 block_ptr += row_inc;
233 }
234 ADVANCE_BLOCK();
235 break;
236
237 /* Unknown opcode */
238 default:
239 printf("Unknown opcode %d in rpza chunk."
240 " Skip remaining %d bytes of chunk data.\n", opcode,
241 chunk_size - stream_ptr);
242 return;
243 } /* Opcode switch */
244 }
245 }
246
247 static int rpza_decode_init(AVCodecContext *avctx)
248 {
249 RpzaContext *s = (RpzaContext *)avctx->priv_data;
250
251 s->avctx = avctx;
252 avctx->pix_fmt = PIX_FMT_RGB555;
253 avctx->has_b_frames = 0;
254 dsputil_init(&s->dsp, avctx);
255
256 s->frame.data[0] = s->prev_frame.data[0] = NULL;
257
258 return 0;
259 }
260
261 static int rpza_decode_frame(AVCodecContext *avctx,
262 void *data, int *data_size,
263 uint8_t *buf, int buf_size)
264 {
265 RpzaContext *s = (RpzaContext *)avctx->priv_data;
266
267 s->buf = buf;
268 s->size = buf_size;
269
270 if (avctx->get_buffer(avctx, &s->frame)) {
271 printf (" RPZA Video: get_buffer() failed\n");
272 return -1;
273 }
274
275 rpza_decode_stream(s);
276
277 if (s->prev_frame.data[0])
278 avctx->release_buffer(avctx, &s->prev_frame);
279
280 /* shuffle frames */
281 s->prev_frame = s->frame;
282
283 *data_size = sizeof(AVFrame);
284 *(AVFrame*)data = s->frame;
285
286 /* always report that the buffer was completely consumed */
287 return buf_size;
288 }
289
290 static int rpza_decode_end(AVCodecContext *avctx)
291 {
292 RpzaContext *s = (RpzaContext *)avctx->priv_data;
293
294 if (s->prev_frame.data[0])
295 avctx->release_buffer(avctx, &s->prev_frame);
296
297 return 0;
298 }
299
300 AVCodec rpza_decoder = {
301 "rpza",
302 CODEC_TYPE_VIDEO,
303 CODEC_ID_RPZA,
304 sizeof(RpzaContext),
305 rpza_decode_init,
306 NULL,
307 rpza_decode_end,
308 rpza_decode_frame,
309 CODEC_CAP_DR1,
310 };