Statistics
| Branch: | Revision:

ffmpeg / libavcodec / pamenc.c @ 2912e87a

History | View | Annotate | Download (3.45 KB)

1
/*
2
 * PAM 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 "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 ff_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
};