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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 | }; |