msrle: Use AVFrame instead of AVPicture
[libav.git] / libavcodec / msrledec.c
1 /*
2 * Microsoft RLE decoder
3 * Copyright (C) 2008 Konstantin Shishkov
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 * MS RLE decoder based on decoder by Mike Melanson and my own for TSCC
25 * For more information about the MS RLE format, visit:
26 * http://www.multimedia.cx/msrle.txt
27 */
28
29 #include "libavutil/intreadwrite.h"
30 #include "avcodec.h"
31 #include "msrledec.h"
32
33 static int msrle_decode_pal4(AVCodecContext *avctx, AVFrame *pic,
34 GetByteContext *gb)
35 {
36 unsigned char rle_code;
37 unsigned char extra_byte, odd_pixel;
38 unsigned char stream_byte;
39 unsigned int pixel_ptr = 0;
40 int row_dec = pic->linesize[0];
41 int row_ptr = (avctx->height - 1) * row_dec;
42 int frame_size = FFABS(row_dec) * avctx->height;
43 int i;
44
45 while (row_ptr >= 0) {
46 if (bytestream2_get_bytes_left(gb) <= 0) {
47 av_log(avctx, AV_LOG_ERROR,
48 "MS RLE: bytestream overrun, %d rows left\n",
49 row_ptr);
50 return AVERROR_INVALIDDATA;
51 }
52 rle_code = stream_byte = bytestream2_get_byteu(gb);
53 if (rle_code == 0) {
54 /* fetch the next byte to see how to handle escape code */
55 stream_byte = bytestream2_get_byte(gb);
56 if (stream_byte == 0) {
57 /* line is done, goto the next one */
58 row_ptr -= row_dec;
59 pixel_ptr = 0;
60 } else if (stream_byte == 1) {
61 /* decode is done */
62 return 0;
63 } else if (stream_byte == 2) {
64 /* reposition frame decode coordinates */
65 stream_byte = bytestream2_get_byte(gb);
66 pixel_ptr += stream_byte;
67 stream_byte = bytestream2_get_byte(gb);
68 row_ptr -= stream_byte * row_dec;
69 } else {
70 // copy pixels from encoded stream
71 odd_pixel = stream_byte & 1;
72 rle_code = (stream_byte + 1) / 2;
73 extra_byte = rle_code & 0x01;
74 if (row_ptr + pixel_ptr + stream_byte > frame_size ||
75 bytestream2_get_bytes_left(gb) < rle_code) {
76 av_log(avctx, AV_LOG_ERROR,
77 "MS RLE: frame/stream ptr just went out of bounds (copy)\n");
78 return AVERROR_INVALIDDATA;
79 }
80
81 for (i = 0; i < rle_code; i++) {
82 if (pixel_ptr >= avctx->width)
83 break;
84 stream_byte = bytestream2_get_byteu(gb);
85 pic->data[0][row_ptr + pixel_ptr] = stream_byte >> 4;
86 pixel_ptr++;
87 if (i + 1 == rle_code && odd_pixel)
88 break;
89 if (pixel_ptr >= avctx->width)
90 break;
91 pic->data[0][row_ptr + pixel_ptr] = stream_byte & 0x0F;
92 pixel_ptr++;
93 }
94
95 // if the RLE code is odd, skip a byte in the stream
96 if (extra_byte)
97 bytestream2_skip(gb, 1);
98 }
99 } else {
100 // decode a run of data
101 if (row_ptr + pixel_ptr + stream_byte > frame_size) {
102 av_log(avctx, AV_LOG_ERROR,
103 "MS RLE: frame ptr just went out of bounds (run)\n");
104 return AVERROR_INVALIDDATA;
105 }
106 stream_byte = bytestream2_get_byte(gb);
107 for (i = 0; i < rle_code; i++) {
108 if (pixel_ptr >= avctx->width)
109 break;
110 if ((i & 1) == 0)
111 pic->data[0][row_ptr + pixel_ptr] = stream_byte >> 4;
112 else
113 pic->data[0][row_ptr + pixel_ptr] = stream_byte & 0x0F;
114 pixel_ptr++;
115 }
116 }
117 }
118
119 /* one last sanity check on the way out */
120 if (bytestream2_get_bytes_left(gb)) {
121 av_log(avctx, AV_LOG_ERROR,
122 "MS RLE: ended frame decode with %d bytes left over\n",
123 bytestream2_get_bytes_left(gb));
124 return AVERROR_INVALIDDATA;
125 }
126
127 return 0;
128 }
129
130
131 static int msrle_decode_8_16_24_32(AVCodecContext *avctx, AVFrame *pic,
132 int depth, GetByteContext *gb)
133 {
134 uint8_t *output, *output_end;
135 int p1, p2, line=avctx->height - 1, pos=0, i;
136 uint16_t pix16;
137 uint32_t pix32;
138 unsigned int width= FFABS(pic->linesize[0]) / (depth >> 3);
139
140 output = pic->data[0] + (avctx->height - 1) * pic->linesize[0];
141 output_end = pic->data[0] + avctx->height * pic->linesize[0];
142 while (bytestream2_get_bytes_left(gb) > 0) {
143 p1 = bytestream2_get_byteu(gb);
144 if(p1 == 0) { //Escape code
145 p2 = bytestream2_get_byte(gb);
146 if(p2 == 0) { //End-of-line
147 if (--line < 0) {
148 if (bytestream2_get_be16(gb) == 1) { // end-of-picture
149 return 0;
150 } else {
151 av_log(avctx, AV_LOG_ERROR,
152 "Next line is beyond picture bounds (%d bytes left)\n",
153 bytestream2_get_bytes_left(gb));
154 return AVERROR_INVALIDDATA;
155 }
156 }
157 output = pic->data[0] + line * pic->linesize[0];
158 pos = 0;
159 continue;
160 } else if(p2 == 1) { //End-of-picture
161 return 0;
162 } else if(p2 == 2) { //Skip
163 p1 = bytestream2_get_byte(gb);
164 p2 = bytestream2_get_byte(gb);
165 line -= p2;
166 pos += p1;
167 if (line < 0 || pos >= width){
168 av_log(avctx, AV_LOG_ERROR, "Skip beyond picture bounds\n");
169 return -1;
170 }
171 output = pic->data[0] + line * pic->linesize[0] + pos * (depth >> 3);
172 continue;
173 }
174 // Copy data
175 if ((pic->linesize[0] > 0 && output + p2 * (depth >> 3) > output_end) ||
176 (pic->linesize[0] < 0 && output + p2 * (depth >> 3) < output_end)) {
177 bytestream2_skip(gb, 2 * (depth >> 3));
178 continue;
179 } else if (bytestream2_get_bytes_left(gb) < p2 * (depth >> 3)) {
180 av_log(avctx, AV_LOG_ERROR, "bytestream overrun\n");
181 return AVERROR_INVALIDDATA;
182 }
183
184 if ((depth == 8) || (depth == 24)) {
185 for(i = 0; i < p2 * (depth >> 3); i++) {
186 *output++ = bytestream2_get_byteu(gb);
187 }
188 // RLE8 copy is actually padded - and runs are not!
189 if(depth == 8 && (p2 & 1)) {
190 bytestream2_skip(gb, 1);
191 }
192 } else if (depth == 16) {
193 for(i = 0; i < p2; i++) {
194 *(uint16_t*)output = bytestream2_get_le16u(gb);
195 output += 2;
196 }
197 } else if (depth == 32) {
198 for(i = 0; i < p2; i++) {
199 *(uint32_t*)output = bytestream2_get_le32u(gb);
200 output += 4;
201 }
202 }
203 pos += p2;
204 } else { //run of pixels
205 uint8_t pix[3]; //original pixel
206 switch(depth){
207 case 8: pix[0] = bytestream2_get_byte(gb);
208 break;
209 case 16: pix16 = bytestream2_get_le16(gb);
210 break;
211 case 24: pix[0] = bytestream2_get_byte(gb);
212 pix[1] = bytestream2_get_byte(gb);
213 pix[2] = bytestream2_get_byte(gb);
214 break;
215 case 32: pix32 = bytestream2_get_le32(gb);
216 break;
217 }
218 if ((pic->linesize[0] > 0 && output + p1 * (depth >> 3) > output_end) ||
219 (pic->linesize[0] < 0 && output + p1 * (depth >> 3) < output_end))
220 continue;
221 for(i = 0; i < p1; i++) {
222 switch(depth){
223 case 8: *output++ = pix[0];
224 break;
225 case 16: *(uint16_t*)output = pix16;
226 output += 2;
227 break;
228 case 24: *output++ = pix[0];
229 *output++ = pix[1];
230 *output++ = pix[2];
231 break;
232 case 32: *(uint32_t*)output = pix32;
233 output += 4;
234 break;
235 }
236 }
237 pos += p1;
238 }
239 }
240
241 av_log(avctx, AV_LOG_WARNING, "MS RLE warning: no end-of-picture code\n");
242 return 0;
243 }
244
245
246 int ff_msrle_decode(AVCodecContext *avctx, AVFrame *pic,
247 int depth, GetByteContext *gb)
248 {
249 switch(depth){
250 case 4:
251 return msrle_decode_pal4(avctx, pic, gb);
252 case 8:
253 case 16:
254 case 24:
255 case 32:
256 return msrle_decode_8_16_24_32(avctx, pic, depth, gb);
257 default:
258 av_log(avctx, AV_LOG_ERROR, "Unknown depth %d\n", depth);
259 return -1;
260 }
261 }