xref: /third_party/ffmpeg/libavcodec/pamenc.c (revision cabdff1a)
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 "libavutil/avassert.h"
23#include "avcodec.h"
24#include "codec_internal.h"
25#include "encode.h"
26
27static int pam_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
28                            const AVFrame *p, int *got_packet)
29{
30    int i, h, w, n, linesize, depth, maxval, ret, header_size;
31    uint8_t *bytestream, *ptr;
32    const char *tuple_type;
33    char header[100];
34
35    h = avctx->height;
36    w = avctx->width;
37    switch (avctx->pix_fmt) {
38    case AV_PIX_FMT_MONOBLACK:
39        n          = w;
40        depth      = 1;
41        maxval     = 1;
42        tuple_type = "BLACKANDWHITE";
43        break;
44    case AV_PIX_FMT_GRAY8:
45        n          = w;
46        depth      = 1;
47        maxval     = 255;
48        tuple_type = "GRAYSCALE";
49        break;
50    case AV_PIX_FMT_GRAY16BE:
51        n          = w * 2;
52        depth      = 1;
53        maxval     = 0xFFFF;
54        tuple_type = "GRAYSCALE";
55        break;
56    case AV_PIX_FMT_GRAY8A:
57        n          = w * 2;
58        depth      = 2;
59        maxval     = 255;
60        tuple_type = "GRAYSCALE_ALPHA";
61        break;
62    case AV_PIX_FMT_YA16BE:
63        n          = w * 4;
64        depth      = 2;
65        maxval     = 0xFFFF;
66        tuple_type = "GRAYSCALE_ALPHA";
67        break;
68    case AV_PIX_FMT_RGB24:
69        n          = w * 3;
70        depth      = 3;
71        maxval     = 255;
72        tuple_type = "RGB";
73        break;
74    case AV_PIX_FMT_RGBA:
75        n          = w * 4;
76        depth      = 4;
77        maxval     = 255;
78        tuple_type = "RGB_ALPHA";
79        break;
80    case AV_PIX_FMT_RGB48BE:
81        n          = w * 6;
82        depth      = 3;
83        maxval     = 0xFFFF;
84        tuple_type = "RGB";
85        break;
86    case AV_PIX_FMT_RGBA64BE:
87        n          = w * 8;
88        depth      = 4;
89        maxval     = 0xFFFF;
90        tuple_type = "RGB_ALPHA";
91        break;
92    default:
93        return -1;
94    }
95
96    header_size = snprintf(header, sizeof(header),
97             "P7\nWIDTH %d\nHEIGHT %d\nDEPTH %d\nMAXVAL %d\nTUPLTYPE %s\nENDHDR\n",
98             w, h, depth, maxval, tuple_type);
99    av_assert1(header_size < sizeof(header));
100
101    if ((ret = ff_get_encode_buffer(avctx, pkt, n*h + header_size, 0)) < 0)
102        return ret;
103
104    bytestream       = pkt->data;
105    memcpy(bytestream, header, header_size);
106    bytestream += header_size;
107
108    ptr      = p->data[0];
109    linesize = p->linesize[0];
110
111    if (avctx->pix_fmt == AV_PIX_FMT_MONOBLACK){
112        int j;
113        for (i = 0; i < h; i++) {
114            for (j = 0; j < w; j++)
115                *bytestream++ = ptr[j >> 3] >> (7 - j & 7) & 1;
116            ptr += linesize;
117        }
118    } else {
119        for (i = 0; i < h; i++) {
120            memcpy(bytestream, ptr, n);
121            bytestream += n;
122            ptr        += linesize;
123        }
124    }
125
126    *got_packet = 1;
127    return 0;
128}
129
130const FFCodec ff_pam_encoder = {
131    .p.name         = "pam",
132    .p.long_name    = NULL_IF_CONFIG_SMALL("PAM (Portable AnyMap) image"),
133    .p.type         = AVMEDIA_TYPE_VIDEO,
134    .p.id           = AV_CODEC_ID_PAM,
135    .p.capabilities = AV_CODEC_CAP_DR1,
136    FF_CODEC_ENCODE_CB(pam_encode_frame),
137    .p.pix_fmts     = (const enum AVPixelFormat[]){
138        AV_PIX_FMT_RGB24, AV_PIX_FMT_RGBA,
139        AV_PIX_FMT_RGB48BE, AV_PIX_FMT_RGBA64BE,
140        AV_PIX_FMT_GRAY8, AV_PIX_FMT_GRAY8A,
141        AV_PIX_FMT_GRAY16BE, AV_PIX_FMT_YA16BE,
142        AV_PIX_FMT_MONOBLACK, AV_PIX_FMT_NONE
143    },
144    .caps_internal  = FF_CODEC_CAP_INIT_THREADSAFE,
145};
146