pnmenc.c 5.96 KB
Newer Older
1 2
/*
 * PNM image format
3
 * Copyright (c) 2002, 2003 Fabrice Bellard
4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */
21

22
#include "libavutil/pixdesc.h"
23
#include "avcodec.h"
24
#include "internal.h"
25

26
static int pnm_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
27
                            const AVFrame *p, int *got_packet)
28
{
29
    uint8_t *bytestream, *bytestream_start, *bytestream_end;
30
    int i, h, h1, c, n, linesize, ret;
31 32
    uint8_t *ptr, *ptr1, *ptr2;

33
    if ((ret = ff_alloc_packet2(avctx, pkt, avpicture_get_size(avctx->pix_fmt,
34
                                                       avctx->width,
35
                                                       avctx->height) + 200)) < 0)
36
        return ret;
37

38 39 40
    bytestream_start =
    bytestream       = pkt->data;
    bytestream_end   = pkt->data + pkt->size;
41

42
    h  = avctx->height;
43
    h1 = h;
44
    switch (avctx->pix_fmt) {
45
    case AV_PIX_FMT_MONOWHITE:
46 47
        c  = '4';
        n  = (avctx->width + 7) >> 3;
48
        break;
49
    case AV_PIX_FMT_GRAY8:
50 51
        c  = '5';
        n  = avctx->width;
52
        break;
53
    case AV_PIX_FMT_GRAY16BE:
54 55
        c  = '5';
        n  = avctx->width * 2;
56
        break;
57
    case AV_PIX_FMT_RGB24:
58 59
        c  = '6';
        n  = avctx->width * 3;
60
        break;
61
    case AV_PIX_FMT_RGB48BE:
62 63
        c  = '6';
        n  = avctx->width * 6;
64
        break;
65
    case AV_PIX_FMT_YUV420P:
66 67
        if (avctx->width & 1 || avctx->height & 1) {
            av_log(avctx, AV_LOG_ERROR, "pgmyuv needs even width and height\n");
68 69
            return AVERROR(EINVAL);
        }
70 71
        c  = '5';
        n  = avctx->width;
72 73
        h1 = (h * 3) / 2;
        break;
74 75 76 77 78
    case AV_PIX_FMT_YUV420P16BE:
        c  = '5';
        n  = avctx->width * 2;
        h1 = (h * 3) / 2;
        break;
79 80 81
    default:
        return -1;
    }
82
    snprintf(bytestream, bytestream_end - bytestream,
83
             "P%c\n%d %d\n", c, avctx->width, h1);
84
    bytestream += strlen(bytestream);
85
    if (avctx->pix_fmt != AV_PIX_FMT_MONOWHITE) {
86
        int maxdepth = (1 << (av_pix_fmt_desc_get(avctx->pix_fmt)->comp[0].depth_minus1 + 1)) - 1;
87
        snprintf(bytestream, bytestream_end - bytestream,
88
                 "%d\n", maxdepth);
89
        bytestream += strlen(bytestream);
90 91
    }

92
    ptr      = p->data[0];
93
    linesize = p->linesize[0];
94
    for (i = 0; i < h; i++) {
95 96 97
        memcpy(bytestream, ptr, n);
        bytestream += n;
        ptr        += linesize;
98 99
    }

100
    if (avctx->pix_fmt == AV_PIX_FMT_YUV420P || avctx->pix_fmt == AV_PIX_FMT_YUV420P16BE) {
101 102 103 104
        h >>= 1;
        n >>= 1;
        ptr1 = p->data[1];
        ptr2 = p->data[2];
105
        for (i = 0; i < h; i++) {
106 107 108 109
            memcpy(bytestream, ptr1, n);
            bytestream += n;
            memcpy(bytestream, ptr2, n);
            bytestream += n;
110 111 112 113
                ptr1 += p->linesize[1];
                ptr2 += p->linesize[2];
        }
    }
114
    pkt->size   = bytestream - bytestream_start;
115 116 117 118
    pkt->flags |= AV_PKT_FLAG_KEY;
    *got_packet = 1;

    return 0;
119 120
}

121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137
static av_cold int pnm_encode_init(AVCodecContext *avctx)
{
    avctx->coded_frame = av_frame_alloc();
    if (!avctx->coded_frame)
        return AVERROR(ENOMEM);

    avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;
    avctx->coded_frame->key_frame = 1;

    return 0;
}

static av_cold int pnm_encode_close(AVCodecContext *avctx)
{
    av_frame_free(&avctx->coded_frame);
    return 0;
}
138

139
#if CONFIG_PGM_ENCODER
140
AVCodec ff_pgm_encoder = {
141
    .name           = "pgm",
142
    .long_name      = NULL_IF_CONFIG_SMALL("PGM (Portable GrayMap) image"),
143
    .type           = AVMEDIA_TYPE_VIDEO,
144
    .id             = AV_CODEC_ID_PGM,
145 146
    .init           = pnm_encode_init,
    .close          = pnm_encode_close,
147
    .encode2        = pnm_encode_frame,
148 149
    .pix_fmts       = (const enum AVPixelFormat[]){
        AV_PIX_FMT_GRAY8, AV_PIX_FMT_GRAY16BE, AV_PIX_FMT_NONE
150
    },
151
};
152
#endif
153

154
#if CONFIG_PGMYUV_ENCODER
155
AVCodec ff_pgmyuv_encoder = {
156
    .name           = "pgmyuv",
157
    .long_name      = NULL_IF_CONFIG_SMALL("PGMYUV (Portable GrayMap YUV) image"),
158
    .type           = AVMEDIA_TYPE_VIDEO,
159
    .id             = AV_CODEC_ID_PGMYUV,
160 161
    .init           = pnm_encode_init,
    .close          = pnm_encode_close,
162
    .encode2        = pnm_encode_frame,
163 164 165
    .pix_fmts       = (const enum AVPixelFormat[]){
        AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV420P16BE, AV_PIX_FMT_NONE
    },
166
};
167
#endif
168

169
#if CONFIG_PPM_ENCODER
170
AVCodec ff_ppm_encoder = {
171
    .name           = "ppm",
172
    .long_name      = NULL_IF_CONFIG_SMALL("PPM (Portable PixelMap) image"),
173
    .type           = AVMEDIA_TYPE_VIDEO,
174
    .id             = AV_CODEC_ID_PPM,
175 176
    .init           = pnm_encode_init,
    .close          = pnm_encode_close,
177
    .encode2        = pnm_encode_frame,
178 179
    .pix_fmts       = (const enum AVPixelFormat[]){
        AV_PIX_FMT_RGB24, AV_PIX_FMT_RGB48BE, AV_PIX_FMT_NONE
180
    },
181
};
182
#endif
183

184
#if CONFIG_PBM_ENCODER
185
AVCodec ff_pbm_encoder = {
186
    .name           = "pbm",
187
    .long_name      = NULL_IF_CONFIG_SMALL("PBM (Portable BitMap) image"),
188
    .type           = AVMEDIA_TYPE_VIDEO,
189
    .id             = AV_CODEC_ID_PBM,
190 191
    .init           = pnm_encode_init,
    .close          = pnm_encode_close,
192
    .encode2        = pnm_encode_frame,
193 194
    .pix_fmts       = (const enum AVPixelFormat[]){ AV_PIX_FMT_MONOWHITE,
                                                  AV_PIX_FMT_NONE },
195
};
196
#endif