ae0ea3a102bff1e8a884b85dc21639e376f6a73f
[libav.git] / libavcodec / pamenc.c
1 /*
2 * PAM image format
3 * Copyright (c) 2002, 2003 Fabrice Bellard
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 #include "avcodec.h"
23 #include "bytestream.h"
24 #include "pnm.h"
25
26
27 static int pam_encode_frame(AVCodecContext *avctx, unsigned char *outbuf,
28 int buf_size, void *data)
29 {
30 PNMContext *s = avctx->priv_data;
31 AVFrame *pict = data;
32 AVFrame * const p = (AVFrame*)&s->picture;
33 int i, h, w, n, linesize, depth, maxval;
34 const char *tuple_type;
35 uint8_t *ptr;
36
37 if (buf_size < avpicture_get_size(avctx->pix_fmt, avctx->width, avctx->height) + 200) {
38 av_log(avctx, AV_LOG_ERROR, "encoded frame too large\n");
39 return -1;
40 }
41
42 *p = *pict;
43 p->pict_type = FF_I_TYPE;
44 p->key_frame = 1;
45
46 s->bytestream_start =
47 s->bytestream = outbuf;
48 s->bytestream_end = outbuf+buf_size;
49
50 h = avctx->height;
51 w = avctx->width;
52 switch (avctx->pix_fmt) {
53 case PIX_FMT_MONOWHITE:
54 n = (w + 7) >> 3;
55 depth = 1;
56 maxval = 1;
57 tuple_type = "BLACKANDWHITE";
58 break;
59 case PIX_FMT_GRAY8:
60 n = w;
61 depth = 1;
62 maxval = 255;
63 tuple_type = "GRAYSCALE";
64 break;
65 case PIX_FMT_RGB24:
66 n = w * 3;
67 depth = 3;
68 maxval = 255;
69 tuple_type = "RGB";
70 break;
71 case PIX_FMT_RGB32:
72 n = w * 4;
73 depth = 4;
74 maxval = 255;
75 tuple_type = "RGB_ALPHA";
76 break;
77 default:
78 return -1;
79 }
80 snprintf(s->bytestream, s->bytestream_end - s->bytestream,
81 "P7\nWIDTH %d\nHEIGHT %d\nDEPTH %d\nMAXVAL %d\nTUPLETYPE %s\nENDHDR\n",
82 w, h, depth, maxval, tuple_type);
83 s->bytestream += strlen(s->bytestream);
84
85 ptr = p->data[0];
86 linesize = p->linesize[0];
87
88 if (avctx->pix_fmt == PIX_FMT_RGB32) {
89 int j;
90 unsigned int v;
91
92 for (i = 0; i < h; i++) {
93 for (j = 0; j < w; j++) {
94 v = ((uint32_t *)ptr)[j];
95 bytestream_put_be24(&s->bytestream, v);
96 *s->bytestream++ = v >> 24;
97 }
98 ptr += linesize;
99 }
100 } else {
101 for (i = 0; i < h; i++) {
102 memcpy(s->bytestream, ptr, n);
103 s->bytestream += n;
104 ptr += linesize;
105 }
106 }
107 return s->bytestream - s->bytestream_start;
108 }
109
110
111 AVCodec pam_encoder = {
112 "pam",
113 AVMEDIA_TYPE_VIDEO,
114 CODEC_ID_PAM,
115 sizeof(PNMContext),
116 ff_pnm_init,
117 pam_encode_frame,
118 .pix_fmts = (const enum PixelFormat[]){PIX_FMT_RGB24, PIX_FMT_RGB32, PIX_FMT_GRAY8, PIX_FMT_MONOWHITE, PIX_FMT_NONE},
119 .long_name = NULL_IF_CONFIG_SMALL("PAM (Portable AnyMap) image"),
120 };