summaryrefslogtreecommitdiffstats
path: root/libavcodec/dpxenc.c
blob: 89548ba0c3240ca1192054eae7645db3ac79fe32 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
/*
 * DPX (.dpx) image encoder
 * Copyright (c) 2011 Peter Ross <pross@xvid.org>
 *
 * This file is part of Libav.
 *
 * Libav 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.
 *
 * Libav 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 Libav; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include "libavutil/intreadwrite.h"
#include "libavutil/imgutils.h"
#include "avcodec.h"
#include "internal.h"

typedef struct DPXContext {
    AVFrame picture;
    int big_endian;
    int bits_per_component;
    int descriptor;
} DPXContext;

static av_cold int encode_init(AVCodecContext *avctx)
{
    DPXContext *s = avctx->priv_data;

    avctx->coded_frame = &s->picture;
    avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;
    avctx->coded_frame->key_frame = 1;

    s->big_endian         = 1;
    s->bits_per_component = 8;
    s->descriptor         = 50; /* RGB */

    switch (avctx->pix_fmt) {
    case PIX_FMT_RGB24:
        break;
    case PIX_FMT_RGBA:
        s->descriptor = 51; /* RGBA */
        break;
    case PIX_FMT_RGB48LE:
        s->big_endian = 0;
    case PIX_FMT_RGB48BE:
        s->bits_per_component = avctx->bits_per_raw_sample ? avctx->bits_per_raw_sample : 16;
        break;
    default:
        av_log(avctx, AV_LOG_INFO, "unsupported pixel format\n");
        return -1;
    }

    return 0;
}

#define write16(p, value) \
do { \
    if (s->big_endian) AV_WB16(p, value); \
    else               AV_WL16(p, value); \
} while(0)

#define write32(p, value) \
do { \
    if (s->big_endian) AV_WB32(p, value); \
    else               AV_WL32(p, value); \
} while(0)

static void encode_rgb48_10bit(AVCodecContext *avctx, const AVPicture *pic,
                               uint8_t *dst)
{
    DPXContext *s = avctx->priv_data;
    const uint8_t *src = pic->data[0];
    int x, y;

    for (y = 0; y < avctx->height; y++) {
        for (x = 0; x < avctx->width; x++) {
            int value;
            if ((avctx->pix_fmt & 1)) {
                value = ((AV_RB16(src + 6*x + 4) & 0xFFC0) >> 4)
                      | ((AV_RB16(src + 6*x + 2) & 0xFFC0) << 6)
                      | ((AV_RB16(src + 6*x + 0) & 0xFFC0) << 16);
            } else {
                value = ((AV_RL16(src + 6*x + 4) & 0xFFC0) >> 4)
                      | ((AV_RL16(src + 6*x + 2) & 0xFFC0) << 6)
                      | ((AV_RL16(src + 6*x + 0) & 0xFFC0) << 16);
            }
            write32(dst, value);
            dst += 4;
        }
        src += pic->linesize[0];
    }
}

static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
                        const AVFrame *frame, int *got_packet)
{
    DPXContext *s = avctx->priv_data;
    int size, ret;
    uint8_t *buf;

#define HEADER_SIZE 1664  /* DPX Generic header */
    if (s->bits_per_component == 10)
        size = avctx->height * avctx->width * 4;
    else
        size = avpicture_get_size(avctx->pix_fmt, avctx->width, avctx->height);
    if ((ret = ff_alloc_packet(pkt, size + HEADER_SIZE)) < 0) {
        av_log(avctx, AV_LOG_ERROR, "Error getting output packet.\n");
        return ret;
    }
    buf = pkt->data;

    memset(buf, 0, HEADER_SIZE);

    /* File information header */
    write32(buf,       MKBETAG('S','D','P','X'));
    write32(buf +   4, HEADER_SIZE);
    memcpy (buf +   8, "V1.0", 4);
    write32(buf +  20, 1); /* new image */
    write32(buf +  24, HEADER_SIZE);
    if (!(avctx->flags & CODEC_FLAG_BITEXACT))
        memcpy (buf + 160, LIBAVCODEC_IDENT, FFMIN(sizeof(LIBAVCODEC_IDENT), 100));
    write32(buf + 660, 0xFFFFFFFF); /* unencrypted */

    /* Image information header */
    write16(buf + 768, 0); /* orientation; left to right, top to bottom */
    write16(buf + 770, 1); /* number of elements */
    write32(buf + 772, avctx->width);
    write32(buf + 776, avctx->height);
    buf[800] = s->descriptor;
    buf[801] = 2; /* linear transfer */
    buf[802] = 2; /* linear colorimetric */
    buf[803] = s->bits_per_component;
    write16(buf + 804, s->bits_per_component == 10 ? 1 : 0); /* packing method */

    /* Image source information header */
    write32(buf + 1628, avctx->sample_aspect_ratio.num);
    write32(buf + 1632, avctx->sample_aspect_ratio.den);

    switch (s->bits_per_component) {
    case 8:
    case 16:
        size = avpicture_layout((const AVPicture*)frame, avctx->pix_fmt,
                                avctx->width, avctx->height,
                                buf + HEADER_SIZE, pkt->size - HEADER_SIZE);
        if (size < 0)
            return size;
        break;
    case 10:
        encode_rgb48_10bit(avctx, (const AVPicture*)frame, buf + HEADER_SIZE);
        break;
    default:
        av_log(avctx, AV_LOG_ERROR, "Unsupported bit depth: %d\n", s->bits_per_component);
        return -1;
    }

    size += HEADER_SIZE;

    write32(buf + 16, size); /* file size */

    pkt->flags |= AV_PKT_FLAG_KEY;
    *got_packet = 1;

    return 0;
}

AVCodec ff_dpx_encoder = {
    .name = "dpx",
    .type = AVMEDIA_TYPE_VIDEO,
    .id   = CODEC_ID_DPX,
    .priv_data_size = sizeof(DPXContext),
    .init   = encode_init,
    .encode2 = encode_frame,
    .pix_fmts = (const enum PixelFormat[]){
        PIX_FMT_RGB24,
        PIX_FMT_RGBA,
        PIX_FMT_RGB48LE,
        PIX_FMT_RGB48BE,
        PIX_FMT_NONE},
    .long_name = NULL_IF_CONFIG_SMALL("DPX image"),
};
OpenPOWER on IntegriCloud