50e8bce16819e48719dc74ccd47036c37744c172
[libav.git] / libavcodec / pnmdec.c
1 /*
2 * PNM image format
3 * Copyright (c) 2002, 2003 Fabrice Bellard
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 #include "avcodec.h"
23 #include "bytestream.h"
24 #include "put_bits.h"
25 #include "pnm.h"
26
27
28 static int pnm_decode_frame(AVCodecContext *avctx, void *data,
29 int *data_size, AVPacket *avpkt)
30 {
31 const uint8_t *buf = avpkt->data;
32 int buf_size = avpkt->size;
33 PNMContext * const s = avctx->priv_data;
34 AVFrame *picture = data;
35 AVFrame * const p = &s->picture;
36 int i, j, n, linesize, h, upgrade = 0;
37 unsigned char *ptr;
38 int components, sample_len;
39
40 s->bytestream_start =
41 s->bytestream = buf;
42 s->bytestream_end = buf + buf_size;
43
44 if (ff_pnm_decode_header(avctx, s) < 0)
45 return -1;
46
47 if (p->data[0])
48 avctx->release_buffer(avctx, p);
49
50 p->reference = 0;
51 if (avctx->get_buffer(avctx, p) < 0) {
52 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
53 return -1;
54 }
55 p->pict_type = AV_PICTURE_TYPE_I;
56 p->key_frame = 1;
57
58 switch (avctx->pix_fmt) {
59 default:
60 return -1;
61 case PIX_FMT_RGB48BE:
62 n = avctx->width * 6;
63 components=3;
64 sample_len=16;
65 goto do_read;
66 case PIX_FMT_RGB24:
67 n = avctx->width * 3;
68 components=3;
69 sample_len=8;
70 goto do_read;
71 case PIX_FMT_GRAY8:
72 n = avctx->width;
73 components=1;
74 sample_len=8;
75 if (s->maxval < 255)
76 upgrade = 1;
77 goto do_read;
78 case PIX_FMT_GRAY16BE:
79 case PIX_FMT_GRAY16LE:
80 n = avctx->width * 2;
81 components=1;
82 sample_len=16;
83 if (s->maxval < 65535)
84 upgrade = 2;
85 goto do_read;
86 case PIX_FMT_MONOWHITE:
87 case PIX_FMT_MONOBLACK:
88 n = (avctx->width + 7) >> 3;
89 components=1;
90 sample_len=1;
91 do_read:
92 ptr = p->data[0];
93 linesize = p->linesize[0];
94 if (s->bytestream + n * avctx->height > s->bytestream_end)
95 return -1;
96 if(s->type < 4){
97 for (i=0; i<avctx->height; i++) {
98 PutBitContext pb;
99 init_put_bits(&pb, ptr, linesize);
100 for(j=0; j<avctx->width * components; j++){
101 unsigned int c=0;
102 int v=0;
103 while(s->bytestream < s->bytestream_end && (*s->bytestream < '0' || *s->bytestream > '9' ))
104 s->bytestream++;
105 if(s->bytestream >= s->bytestream_end)
106 return -1;
107 do{
108 v= 10*v + c;
109 c= (*s->bytestream++) - '0';
110 }while(c <= 9);
111 put_bits(&pb, sample_len, (((1<<sample_len)-1)*v + (s->maxval>>1))/s->maxval);
112 }
113 flush_put_bits(&pb);
114 ptr+= linesize;
115 }
116 }else{
117 for (i = 0; i < avctx->height; i++) {
118 if (!upgrade)
119 memcpy(ptr, s->bytestream, n);
120 else if (upgrade == 1) {
121 unsigned int j, f = (255 * 128 + s->maxval / 2) / s->maxval;
122 for (j = 0; j < n; j++)
123 ptr[j] = (s->bytestream[j] * f + 64) >> 7;
124 } else if (upgrade == 2) {
125 unsigned int j, v, f = (65535 * 32768 + s->maxval / 2) / s->maxval;
126 for (j = 0; j < n / 2; j++) {
127 v = av_be2ne16(((uint16_t *)s->bytestream)[j]);
128 ((uint16_t *)ptr)[j] = (v * f + 16384) >> 15;
129 }
130 }
131 s->bytestream += n;
132 ptr += linesize;
133 }
134 }
135 break;
136 case PIX_FMT_YUV420P:
137 {
138 unsigned char *ptr1, *ptr2;
139
140 n = avctx->width;
141 ptr = p->data[0];
142 linesize = p->linesize[0];
143 if (s->bytestream + n * avctx->height * 3 / 2 > s->bytestream_end)
144 return -1;
145 for (i = 0; i < avctx->height; i++) {
146 memcpy(ptr, s->bytestream, n);
147 s->bytestream += n;
148 ptr += linesize;
149 }
150 ptr1 = p->data[1];
151 ptr2 = p->data[2];
152 n >>= 1;
153 h = avctx->height >> 1;
154 for (i = 0; i < h; i++) {
155 memcpy(ptr1, s->bytestream, n);
156 s->bytestream += n;
157 memcpy(ptr2, s->bytestream, n);
158 s->bytestream += n;
159 ptr1 += p->linesize[1];
160 ptr2 += p->linesize[2];
161 }
162 }
163 break;
164 case PIX_FMT_RGB32:
165 ptr = p->data[0];
166 linesize = p->linesize[0];
167 if (s->bytestream + avctx->width * avctx->height * 4 > s->bytestream_end)
168 return -1;
169 for (i = 0; i < avctx->height; i++) {
170 int j, r, g, b, a;
171
172 for (j = 0; j < avctx->width; j++) {
173 r = *s->bytestream++;
174 g = *s->bytestream++;
175 b = *s->bytestream++;
176 a = *s->bytestream++;
177 ((uint32_t *)ptr)[j] = (a << 24) | (r << 16) | (g << 8) | b;
178 }
179 ptr += linesize;
180 }
181 break;
182 }
183 *picture = s->picture;
184 *data_size = sizeof(AVPicture);
185
186 return s->bytestream - s->bytestream_start;
187 }
188
189
190 #if CONFIG_PGM_DECODER
191 AVCodec ff_pgm_decoder = {
192 .name = "pgm",
193 .type = AVMEDIA_TYPE_VIDEO,
194 .id = CODEC_ID_PGM,
195 .priv_data_size = sizeof(PNMContext),
196 .init = ff_pnm_init,
197 .close = ff_pnm_end,
198 .decode = pnm_decode_frame,
199 .capabilities = CODEC_CAP_DR1,
200 .long_name = NULL_IF_CONFIG_SMALL("PGM (Portable GrayMap) image"),
201 };
202 #endif
203
204 #if CONFIG_PGMYUV_DECODER
205 AVCodec ff_pgmyuv_decoder = {
206 .name = "pgmyuv",
207 .type = AVMEDIA_TYPE_VIDEO,
208 .id = CODEC_ID_PGMYUV,
209 .priv_data_size = sizeof(PNMContext),
210 .init = ff_pnm_init,
211 .close = ff_pnm_end,
212 .decode = pnm_decode_frame,
213 .capabilities = CODEC_CAP_DR1,
214 .long_name = NULL_IF_CONFIG_SMALL("PGMYUV (Portable GrayMap YUV) image"),
215 };
216 #endif
217
218 #if CONFIG_PPM_DECODER
219 AVCodec ff_ppm_decoder = {
220 .name = "ppm",
221 .type = AVMEDIA_TYPE_VIDEO,
222 .id = CODEC_ID_PPM,
223 .priv_data_size = sizeof(PNMContext),
224 .init = ff_pnm_init,
225 .close = ff_pnm_end,
226 .decode = pnm_decode_frame,
227 .capabilities = CODEC_CAP_DR1,
228 .long_name = NULL_IF_CONFIG_SMALL("PPM (Portable PixelMap) image"),
229 };
230 #endif
231
232 #if CONFIG_PBM_DECODER
233 AVCodec ff_pbm_decoder = {
234 .name = "pbm",
235 .type = AVMEDIA_TYPE_VIDEO,
236 .id = CODEC_ID_PBM,
237 .priv_data_size = sizeof(PNMContext),
238 .init = ff_pnm_init,
239 .close = ff_pnm_end,
240 .decode = pnm_decode_frame,
241 .capabilities = CODEC_CAP_DR1,
242 .long_name = NULL_IF_CONFIG_SMALL("PBM (Portable BitMap) image"),
243 };
244 #endif
245
246 #if CONFIG_PAM_DECODER
247 AVCodec ff_pam_decoder = {
248 .name = "pam",
249 .type = AVMEDIA_TYPE_VIDEO,
250 .id = CODEC_ID_PAM,
251 .priv_data_size = sizeof(PNMContext),
252 .init = ff_pnm_init,
253 .close = ff_pnm_end,
254 .decode = pnm_decode_frame,
255 .capabilities = CODEC_CAP_DR1,
256 .long_name = NULL_IF_CONFIG_SMALL("PAM (Portable AnyMap) image"),
257 };
258 #endif