lavc: fix decode_frame() third parameter semantics for video decoders
[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 "internal.h"
25 #include "put_bits.h"
26 #include "pnm.h"
27
28
29 static int pnm_decode_frame(AVCodecContext *avctx, void *data,
30 int *got_frame, AVPacket *avpkt)
31 {
32 const uint8_t *buf = avpkt->data;
33 int buf_size = avpkt->size;
34 PNMContext * const s = avctx->priv_data;
35 AVFrame *picture = data;
36 AVFrame * const p = &s->picture;
37 int i, j, n, linesize, h, upgrade = 0;
38 unsigned char *ptr;
39 int components, sample_len;
40
41 s->bytestream_start =
42 s->bytestream = buf;
43 s->bytestream_end = buf + buf_size;
44
45 if (ff_pnm_decode_header(avctx, s) < 0)
46 return -1;
47
48 if (p->data[0])
49 avctx->release_buffer(avctx, p);
50
51 p->reference = 0;
52 if (ff_get_buffer(avctx, p) < 0) {
53 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
54 return -1;
55 }
56 p->pict_type = AV_PICTURE_TYPE_I;
57 p->key_frame = 1;
58
59 switch (avctx->pix_fmt) {
60 default:
61 return -1;
62 case AV_PIX_FMT_RGB48BE:
63 n = avctx->width * 6;
64 components=3;
65 sample_len=16;
66 goto do_read;
67 case AV_PIX_FMT_RGB24:
68 n = avctx->width * 3;
69 components=3;
70 sample_len=8;
71 goto do_read;
72 case AV_PIX_FMT_GRAY8:
73 n = avctx->width;
74 components=1;
75 sample_len=8;
76 if (s->maxval < 255)
77 upgrade = 1;
78 goto do_read;
79 case AV_PIX_FMT_GRAY16BE:
80 case AV_PIX_FMT_GRAY16LE:
81 n = avctx->width * 2;
82 components=1;
83 sample_len=16;
84 if (s->maxval < 65535)
85 upgrade = 2;
86 goto do_read;
87 case AV_PIX_FMT_MONOWHITE:
88 case AV_PIX_FMT_MONOBLACK:
89 n = (avctx->width + 7) >> 3;
90 components=1;
91 sample_len=1;
92 do_read:
93 ptr = p->data[0];
94 linesize = p->linesize[0];
95 if (s->bytestream + n * avctx->height > s->bytestream_end)
96 return -1;
97 if(s->type < 4){
98 for (i=0; i<avctx->height; i++) {
99 PutBitContext pb;
100 init_put_bits(&pb, ptr, linesize);
101 for(j=0; j<avctx->width * components; j++){
102 unsigned int c=0;
103 int v=0;
104 while(s->bytestream < s->bytestream_end && (*s->bytestream < '0' || *s->bytestream > '9' ))
105 s->bytestream++;
106 if(s->bytestream >= s->bytestream_end)
107 return -1;
108 do{
109 v= 10*v + c;
110 c= (*s->bytestream++) - '0';
111 }while(c <= 9);
112 put_bits(&pb, sample_len, (((1<<sample_len)-1)*v + (s->maxval>>1))/s->maxval);
113 }
114 flush_put_bits(&pb);
115 ptr+= linesize;
116 }
117 }else{
118 for (i = 0; i < avctx->height; i++) {
119 if (!upgrade)
120 memcpy(ptr, s->bytestream, n);
121 else if (upgrade == 1) {
122 unsigned int j, f = (255 * 128 + s->maxval / 2) / s->maxval;
123 for (j = 0; j < n; j++)
124 ptr[j] = (s->bytestream[j] * f + 64) >> 7;
125 } else if (upgrade == 2) {
126 unsigned int j, v, f = (65535 * 32768 + s->maxval / 2) / s->maxval;
127 for (j = 0; j < n / 2; j++) {
128 v = av_be2ne16(((uint16_t *)s->bytestream)[j]);
129 ((uint16_t *)ptr)[j] = (v * f + 16384) >> 15;
130 }
131 }
132 s->bytestream += n;
133 ptr += linesize;
134 }
135 }
136 break;
137 case AV_PIX_FMT_YUV420P:
138 {
139 unsigned char *ptr1, *ptr2;
140
141 n = avctx->width;
142 ptr = p->data[0];
143 linesize = p->linesize[0];
144 if (s->bytestream + n * avctx->height * 3 / 2 > s->bytestream_end)
145 return -1;
146 for (i = 0; i < avctx->height; i++) {
147 memcpy(ptr, s->bytestream, n);
148 s->bytestream += n;
149 ptr += linesize;
150 }
151 ptr1 = p->data[1];
152 ptr2 = p->data[2];
153 n >>= 1;
154 h = avctx->height >> 1;
155 for (i = 0; i < h; i++) {
156 memcpy(ptr1, s->bytestream, n);
157 s->bytestream += n;
158 memcpy(ptr2, s->bytestream, n);
159 s->bytestream += n;
160 ptr1 += p->linesize[1];
161 ptr2 += p->linesize[2];
162 }
163 }
164 break;
165 case AV_PIX_FMT_RGB32:
166 ptr = p->data[0];
167 linesize = p->linesize[0];
168 if (s->bytestream + avctx->width * avctx->height * 4 > s->bytestream_end)
169 return -1;
170 for (i = 0; i < avctx->height; i++) {
171 int j, r, g, b, a;
172
173 for (j = 0; j < avctx->width; j++) {
174 r = *s->bytestream++;
175 g = *s->bytestream++;
176 b = *s->bytestream++;
177 a = *s->bytestream++;
178 ((uint32_t *)ptr)[j] = (a << 24) | (r << 16) | (g << 8) | b;
179 }
180 ptr += linesize;
181 }
182 break;
183 }
184 *picture = s->picture;
185 *got_frame = 1;
186
187 return s->bytestream - s->bytestream_start;
188 }
189
190
191 #if CONFIG_PGM_DECODER
192 AVCodec ff_pgm_decoder = {
193 .name = "pgm",
194 .type = AVMEDIA_TYPE_VIDEO,
195 .id = AV_CODEC_ID_PGM,
196 .priv_data_size = sizeof(PNMContext),
197 .init = ff_pnm_init,
198 .close = ff_pnm_end,
199 .decode = pnm_decode_frame,
200 .capabilities = CODEC_CAP_DR1,
201 .long_name = NULL_IF_CONFIG_SMALL("PGM (Portable GrayMap) image"),
202 };
203 #endif
204
205 #if CONFIG_PGMYUV_DECODER
206 AVCodec ff_pgmyuv_decoder = {
207 .name = "pgmyuv",
208 .type = AVMEDIA_TYPE_VIDEO,
209 .id = AV_CODEC_ID_PGMYUV,
210 .priv_data_size = sizeof(PNMContext),
211 .init = ff_pnm_init,
212 .close = ff_pnm_end,
213 .decode = pnm_decode_frame,
214 .capabilities = CODEC_CAP_DR1,
215 .long_name = NULL_IF_CONFIG_SMALL("PGMYUV (Portable GrayMap YUV) image"),
216 };
217 #endif
218
219 #if CONFIG_PPM_DECODER
220 AVCodec ff_ppm_decoder = {
221 .name = "ppm",
222 .type = AVMEDIA_TYPE_VIDEO,
223 .id = AV_CODEC_ID_PPM,
224 .priv_data_size = sizeof(PNMContext),
225 .init = ff_pnm_init,
226 .close = ff_pnm_end,
227 .decode = pnm_decode_frame,
228 .capabilities = CODEC_CAP_DR1,
229 .long_name = NULL_IF_CONFIG_SMALL("PPM (Portable PixelMap) image"),
230 };
231 #endif
232
233 #if CONFIG_PBM_DECODER
234 AVCodec ff_pbm_decoder = {
235 .name = "pbm",
236 .type = AVMEDIA_TYPE_VIDEO,
237 .id = AV_CODEC_ID_PBM,
238 .priv_data_size = sizeof(PNMContext),
239 .init = ff_pnm_init,
240 .close = ff_pnm_end,
241 .decode = pnm_decode_frame,
242 .capabilities = CODEC_CAP_DR1,
243 .long_name = NULL_IF_CONFIG_SMALL("PBM (Portable BitMap) image"),
244 };
245 #endif
246
247 #if CONFIG_PAM_DECODER
248 AVCodec ff_pam_decoder = {
249 .name = "pam",
250 .type = AVMEDIA_TYPE_VIDEO,
251 .id = AV_CODEC_ID_PAM,
252 .priv_data_size = sizeof(PNMContext),
253 .init = ff_pnm_init,
254 .close = ff_pnm_end,
255 .decode = pnm_decode_frame,
256 .capabilities = CODEC_CAP_DR1,
257 .long_name = NULL_IF_CONFIG_SMALL("PAM (Portable AnyMap) image"),
258 };
259 #endif