2 * DPX (.dpx) image encoder
3 * Copyright (c) 2011 Peter Ross <pross@xvid.org>
5 * This file is part of Libav.
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.
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.
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
22 #include "libavutil/intreadwrite.h"
23 #include "libavutil/imgutils.h"
26 typedef struct DPXContext {
29 int bits_per_component;
33 static av_cold int encode_init(AVCodecContext *avctx)
35 DPXContext *s = avctx->priv_data;
37 avctx->coded_frame = &s->picture;
38 avctx->coded_frame->pict_type = FF_I_TYPE;
39 avctx->coded_frame->key_frame = 1;
42 s->bits_per_component = 8;
43 s->descriptor = 50; /* RGB */
45 switch (avctx->pix_fmt) {
49 s->descriptor = 51; /* RGBA */
54 s->bits_per_component = avctx->bits_per_raw_sample ? avctx->bits_per_raw_sample : 16;
57 av_log(avctx, AV_LOG_INFO, "unsupported pixel format\n");
64 #define write16(p, value) \
66 if (s->big_endian) AV_WB16(p, value); \
67 else AV_WL16(p, value); \
70 #define write32(p, value) \
72 if (s->big_endian) AV_WB32(p, value); \
73 else AV_WL32(p, value); \
76 static void encode_rgb48_10bit(AVCodecContext *avctx, const AVPicture *pic,
79 DPXContext *s = avctx->priv_data;
80 const uint8_t *src = pic->data[0];
83 for (y = 0; y < avctx->height; y++) {
84 for (x = 0; x < avctx->width; x++) {
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);
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);
98 src += pic->linesize[0];
102 static int encode_frame(AVCodecContext *avctx, unsigned char *buf,
103 int buf_size, void *data)
105 DPXContext *s = avctx->priv_data;
108 #define HEADER_SIZE 1664 /* DPX Generic header */
109 if (buf_size < HEADER_SIZE)
112 memset(buf, 0, HEADER_SIZE);
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 */
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 */
134 /* Image source information header */
135 write32(buf + 1628, avctx->sample_aspect_ratio.num);
136 write32(buf + 1632, avctx->sample_aspect_ratio.den);
138 switch (s->bits_per_component) {
141 size = avpicture_layout(data, avctx->pix_fmt,
142 avctx->width, avctx->height,
143 buf + HEADER_SIZE, buf_size - HEADER_SIZE);
148 size = avctx->height * avctx->width * 4;
149 if (buf_size < HEADER_SIZE + size)
151 encode_rgb48_10bit(avctx, data, buf + HEADER_SIZE);
154 av_log(avctx, AV_LOG_ERROR, "Unsupported bit depth: %d\n", s->bits_per_component);
160 write32(buf + 16, size); /* file size */
164 AVCodec ff_dpx_encoder = {
166 .type = AVMEDIA_TYPE_VIDEO,
168 .priv_data_size = sizeof(DPXContext),
170 .encode = encode_frame,
171 .pix_fmts = (const enum PixelFormat[]){
177 .long_name = NULL_IF_CONFIG_SMALL("DPX image"),