1/*
2 * DPX (.dpx) image encoder
3 * Copyright (c) 2011 Peter Ross <pross@xvid.org>
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 "libavutil/intreadwrite.h"
23#include "libavutil/imgutils.h"
24#include "avcodec.h"
25
26typedef struct DPXContext {
27    AVFrame picture;
28    int big_endian;
29    int bits_per_component;
30    int descriptor;
31} DPXContext;
32
33static av_cold int encode_init(AVCodecContext *avctx)
34{
35    DPXContext *s = avctx->priv_data;
36
37    avctx->coded_frame = &s->picture;
38    avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;
39    avctx->coded_frame->key_frame = 1;
40
41    s->big_endian         = 1;
42    s->bits_per_component = 8;
43    s->descriptor         = 50; /* RGB */
44
45    switch (avctx->pix_fmt) {
46    case PIX_FMT_RGB24:
47        break;
48    case PIX_FMT_RGBA:
49        s->descriptor = 51; /* RGBA */
50        break;
51    case PIX_FMT_RGB48LE:
52        s->big_endian = 0;
53    case PIX_FMT_RGB48BE:
54        s->bits_per_component = avctx->bits_per_raw_sample ? avctx->bits_per_raw_sample : 16;
55        break;
56    default:
57        av_log(avctx, AV_LOG_INFO, "unsupported pixel format\n");
58        return -1;
59    }
60
61    return 0;
62}
63
64#define write16(p, value) \
65do { \
66    if (s->big_endian) AV_WB16(p, value); \
67    else               AV_WL16(p, value); \
68} while(0)
69
70#define write32(p, value) \
71do { \
72    if (s->big_endian) AV_WB32(p, value); \
73    else               AV_WL32(p, value); \
74} while(0)
75
76static void encode_rgb48_10bit(AVCodecContext *avctx, const AVPicture *pic,
77                               uint8_t *dst)
78{
79    DPXContext *s = avctx->priv_data;
80    const uint8_t *src = pic->data[0];
81    int x, y;
82
83    for (y = 0; y < avctx->height; y++) {
84        for (x = 0; x < avctx->width; x++) {
85            int value;
86            if ((avctx->pix_fmt & 1)) {
87                value = ((AV_RB16(src + 6*x + 4) & 0xFFC0) >> 4)
88                      | ((AV_RB16(src + 6*x + 2) & 0xFFC0) << 6)
89                      | ((AV_RB16(src + 6*x + 0) & 0xFFC0) << 16);
90            } else {
91                value = ((AV_RL16(src + 6*x + 4) & 0xFFC0) >> 4)
92                      | ((AV_RL16(src + 6*x + 2) & 0xFFC0) << 6)
93                      | ((AV_RL16(src + 6*x + 0) & 0xFFC0) << 16);
94            }
95            write32(dst, value);
96            dst += 4;
97        }
98        src += pic->linesize[0];
99    }
100}
101
102static int encode_frame(AVCodecContext *avctx, unsigned char *buf,
103                        int buf_size, void *data)
104{
105    DPXContext *s = avctx->priv_data;
106    int size;
107
108#define HEADER_SIZE 1664  /* DPX Generic header */
109    if (buf_size < HEADER_SIZE)
110        return -1;
111
112    memset(buf, 0, HEADER_SIZE);
113
114    /* File information header */
115    write32(buf,       MKBETAG('S','D','P','X'));
116    write32(buf +   4, HEADER_SIZE);
117    memcpy (buf +   8, "V1.0", 4);
118    write32(buf +  20, 1); /* new image */
119    write32(buf +  24, HEADER_SIZE);
120    memcpy (buf + 160, LIBAVCODEC_IDENT, FFMIN(sizeof(LIBAVCODEC_IDENT), 100));
121    write32(buf + 660, 0xFFFFFFFF); /* unencrypted */
122
123    /* Image information header */
124    write16(buf + 768, 0); /* orientation; left to right, top to bottom */
125    write16(buf + 770, 1); /* number of elements */
126    write32(buf + 772, avctx->width);
127    write32(buf + 776, avctx->height);
128    buf[800] = s->descriptor;
129    buf[801] = 2; /* linear transfer */
130    buf[802] = 2; /* linear colorimetric */
131    buf[803] = s->bits_per_component;
132    write16(buf + 804, s->bits_per_component == 10 ? 1 : 0); /* packing method */
133
134    /* Image source information header */
135    write32(buf + 1628, avctx->sample_aspect_ratio.num);
136    write32(buf + 1632, avctx->sample_aspect_ratio.den);
137
138    switch (s->bits_per_component) {
139    case 8:
140    case 16:
141        size = avpicture_layout(data, avctx->pix_fmt,
142                                avctx->width, avctx->height,
143                                buf + HEADER_SIZE, buf_size - HEADER_SIZE);
144        if (size < 0)
145            return size;
146        break;
147    case 10:
148        size = avctx->height * avctx->width * 4;
149        if (buf_size < HEADER_SIZE + size)
150            return -1;
151        encode_rgb48_10bit(avctx, data, buf + HEADER_SIZE);
152        break;
153    default:
154        av_log(avctx, AV_LOG_ERROR, "Unsupported bit depth: %d\n", s->bits_per_component);
155        return -1;
156    }
157
158    size += HEADER_SIZE;
159
160    write32(buf + 16, size); /* file size */
161    return size;
162}
163
164AVCodec ff_dpx_encoder = {
165    .name = "dpx",
166    .type = AVMEDIA_TYPE_VIDEO,
167    .id   = CODEC_ID_DPX,
168    .priv_data_size = sizeof(DPXContext),
169    .init   = encode_init,
170    .encode = encode_frame,
171    .pix_fmts = (const enum PixelFormat[]){
172        PIX_FMT_RGB24,
173        PIX_FMT_RGBA,
174        PIX_FMT_RGB48LE,
175        PIX_FMT_RGB48BE,
176        PIX_FMT_NONE},
177    .long_name = NULL_IF_CONFIG_SMALL("DPX image"),
178};
179