Imported Debian version 2.5.3~trusty1
[deb_ffmpeg.git] / ffmpeg / libavcodec / rpza.c
1 /*
2 * Quicktime Video (RPZA) Video Decoder
3 * Copyright (c) 2003 The FFmpeg Project
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 * QT RPZA Video Decoder by Roberto Togni
25 * For more information about the RPZA format, visit:
26 * http://www.pcisys.net/~melanson/codecs/
27 *
28 * The RPZA decoder outputs RGB555 colorspace data.
29 *
30 * Note that this decoder reads big endian RGB555 pixel values from the
31 * bytestream, arranges them in the host's endian order, and outputs
32 * them to the final rendered map in the same host endian order. This is
33 * intended behavior as the libavcodec documentation states that RGB555
34 * pixels shall be stored in native CPU endianness.
35 */
36
37 #include <stdint.h>
38 #include <stdio.h>
39 #include <stdlib.h>
40 #include <string.h>
41
42 #include "libavutil/internal.h"
43 #include "avcodec.h"
44 #include "bytestream.h"
45 #include "internal.h"
46
47 typedef struct RpzaContext {
48
49 AVCodecContext *avctx;
50 AVFrame *frame;
51
52 GetByteContext gb;
53 } RpzaContext;
54
55 #define ADVANCE_BLOCK() \
56 { \
57 pixel_ptr += 4; \
58 if (pixel_ptr >= width) \
59 { \
60 pixel_ptr = 0; \
61 row_ptr += stride * 4; \
62 } \
63 total_blocks--; \
64 if (total_blocks < 0) \
65 { \
66 av_log(s->avctx, AV_LOG_ERROR, "warning: block counter just went negative (this should not happen)\n"); \
67 return; \
68 } \
69 }
70
71 static void rpza_decode_stream(RpzaContext *s)
72 {
73 int width = s->avctx->width;
74 int stride = s->frame->linesize[0] / 2;
75 int row_inc = stride - 4;
76 int chunk_size;
77 uint16_t colorA = 0, colorB;
78 uint16_t color4[4];
79 uint16_t ta, tb;
80 uint16_t *pixels = (uint16_t *)s->frame->data[0];
81
82 int row_ptr = 0;
83 int pixel_ptr = -4;
84 int block_ptr;
85 int pixel_x, pixel_y;
86 int total_blocks;
87
88 /* First byte is always 0xe1. Warn if it's different */
89 if (bytestream2_peek_byte(&s->gb) != 0xe1)
90 av_log(s->avctx, AV_LOG_ERROR, "First chunk byte is 0x%02x instead of 0xe1\n",
91 bytestream2_peek_byte(&s->gb));
92
93 /* Get chunk size, ingnoring first byte */
94 chunk_size = bytestream2_get_be32(&s->gb) & 0x00FFFFFF;
95
96 /* If length mismatch use size from MOV file and try to decode anyway */
97 if (chunk_size != bytestream2_get_bytes_left(&s->gb) + 4)
98 av_log(s->avctx, AV_LOG_WARNING,
99 "MOV chunk size %d != encoded chunk size %d\n",
100 chunk_size,
101 bytestream2_get_bytes_left(&s->gb) + 4
102 );
103
104 /* Number of 4x4 blocks in frame. */
105 total_blocks = ((s->avctx->width + 3) / 4) * ((s->avctx->height + 3) / 4);
106
107 /* Process chunk data */
108 while (bytestream2_get_bytes_left(&s->gb)) {
109 uint8_t opcode = bytestream2_get_byte(&s->gb); /* Get opcode */
110
111 int n_blocks = (opcode & 0x1f) + 1; /* Extract block counter from opcode */
112
113 /* If opcode MSbit is 0, we need more data to decide what to do */
114 if ((opcode & 0x80) == 0) {
115 colorA = (opcode << 8) | bytestream2_get_byte(&s->gb);
116 opcode = 0;
117 if ((bytestream2_peek_byte(&s->gb) & 0x80) != 0) {
118 /* Must behave as opcode 110xxxxx, using colorA computed
119 * above. Use fake opcode 0x20 to enter switch block at
120 * the right place */
121 opcode = 0x20;
122 n_blocks = 1;
123 }
124 }
125
126 n_blocks = FFMIN(n_blocks, total_blocks);
127
128 switch (opcode & 0xe0) {
129
130 /* Skip blocks */
131 case 0x80:
132 while (n_blocks--) {
133 ADVANCE_BLOCK();
134 }
135 break;
136
137 /* Fill blocks with one color */
138 case 0xa0:
139 colorA = bytestream2_get_be16(&s->gb);
140 while (n_blocks--) {
141 ADVANCE_BLOCK()
142 block_ptr = row_ptr + pixel_ptr;
143 for (pixel_y = 0; pixel_y < 4; pixel_y++) {
144 for (pixel_x = 0; pixel_x < 4; pixel_x++){
145 pixels[block_ptr] = colorA;
146 block_ptr++;
147 }
148 block_ptr += row_inc;
149 }
150 }
151 break;
152
153 /* Fill blocks with 4 colors */
154 case 0xc0:
155 colorA = bytestream2_get_be16(&s->gb);
156 case 0x20:
157 colorB = bytestream2_get_be16(&s->gb);
158
159 /* sort out the colors */
160 color4[0] = colorB;
161 color4[1] = 0;
162 color4[2] = 0;
163 color4[3] = colorA;
164
165 /* red components */
166 ta = (colorA >> 10) & 0x1F;
167 tb = (colorB >> 10) & 0x1F;
168 color4[1] |= ((11 * ta + 21 * tb) >> 5) << 10;
169 color4[2] |= ((21 * ta + 11 * tb) >> 5) << 10;
170
171 /* green components */
172 ta = (colorA >> 5) & 0x1F;
173 tb = (colorB >> 5) & 0x1F;
174 color4[1] |= ((11 * ta + 21 * tb) >> 5) << 5;
175 color4[2] |= ((21 * ta + 11 * tb) >> 5) << 5;
176
177 /* blue components */
178 ta = colorA & 0x1F;
179 tb = colorB & 0x1F;
180 color4[1] |= ((11 * ta + 21 * tb) >> 5);
181 color4[2] |= ((21 * ta + 11 * tb) >> 5);
182
183 if (bytestream2_get_bytes_left(&s->gb) < n_blocks * 4)
184 return;
185 while (n_blocks--) {
186 ADVANCE_BLOCK();
187 block_ptr = row_ptr + pixel_ptr;
188 for (pixel_y = 0; pixel_y < 4; pixel_y++) {
189 uint8_t index = bytestream2_get_byteu(&s->gb);
190 for (pixel_x = 0; pixel_x < 4; pixel_x++){
191 uint8_t idx = (index >> (2 * (3 - pixel_x))) & 0x03;
192 pixels[block_ptr] = color4[idx];
193 block_ptr++;
194 }
195 block_ptr += row_inc;
196 }
197 }
198 break;
199
200 /* Fill block with 16 colors */
201 case 0x00:
202 if (bytestream2_get_bytes_left(&s->gb) < 30)
203 return;
204 ADVANCE_BLOCK();
205 block_ptr = row_ptr + pixel_ptr;
206 for (pixel_y = 0; pixel_y < 4; pixel_y++) {
207 for (pixel_x = 0; pixel_x < 4; pixel_x++){
208 /* We already have color of upper left pixel */
209 if ((pixel_y != 0) || (pixel_x != 0))
210 colorA = bytestream2_get_be16u(&s->gb);
211 pixels[block_ptr] = colorA;
212 block_ptr++;
213 }
214 block_ptr += row_inc;
215 }
216 break;
217
218 /* Unknown opcode */
219 default:
220 av_log(s->avctx, AV_LOG_ERROR, "Unknown opcode %d in rpza chunk."
221 " Skip remaining %d bytes of chunk data.\n", opcode,
222 bytestream2_get_bytes_left(&s->gb));
223 return;
224 } /* Opcode switch */
225 }
226 }
227
228 static av_cold int rpza_decode_init(AVCodecContext *avctx)
229 {
230 RpzaContext *s = avctx->priv_data;
231
232 s->avctx = avctx;
233 avctx->pix_fmt = AV_PIX_FMT_RGB555;
234
235 s->frame = av_frame_alloc();
236 if (!s->frame)
237 return AVERROR(ENOMEM);
238
239 return 0;
240 }
241
242 static int rpza_decode_frame(AVCodecContext *avctx,
243 void *data, int *got_frame,
244 AVPacket *avpkt)
245 {
246 RpzaContext *s = avctx->priv_data;
247 int ret;
248
249 bytestream2_init(&s->gb, avpkt->data, avpkt->size);
250
251 if ((ret = ff_reget_buffer(avctx, s->frame)) < 0)
252 return ret;
253
254 rpza_decode_stream(s);
255
256 if ((ret = av_frame_ref(data, s->frame)) < 0)
257 return ret;
258
259 *got_frame = 1;
260
261 /* always report that the buffer was completely consumed */
262 return avpkt->size;
263 }
264
265 static av_cold int rpza_decode_end(AVCodecContext *avctx)
266 {
267 RpzaContext *s = avctx->priv_data;
268
269 av_frame_free(&s->frame);
270
271 return 0;
272 }
273
274 AVCodec ff_rpza_decoder = {
275 .name = "rpza",
276 .long_name = NULL_IF_CONFIG_SMALL("QuickTime video (RPZA)"),
277 .type = AVMEDIA_TYPE_VIDEO,
278 .id = AV_CODEC_ID_RPZA,
279 .priv_data_size = sizeof(RpzaContext),
280 .init = rpza_decode_init,
281 .close = rpza_decode_end,
282 .decode = rpza_decode_frame,
283 .capabilities = CODEC_CAP_DR1,
284 };