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/*
* 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"
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, unsigned char *buf,
int buf_size, void *data)
{
DPXContext *s = avctx->priv_data;
int size;
#define HEADER_SIZE 1664 /* DPX Generic header */
if (buf_size < HEADER_SIZE)
return -1;
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);
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(data, avctx->pix_fmt,
avctx->width, avctx->height,
buf + HEADER_SIZE, buf_size - HEADER_SIZE);
if (size < 0)
return size;
break;
case 10:
size = avctx->height * avctx->width * 4;
if (buf_size < HEADER_SIZE + size)
return -1;
encode_rgb48_10bit(avctx, data, 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 */
return size;
}
AVCodec ff_dpx_encoder = {
.name = "dpx",
.type = AVMEDIA_TYPE_VIDEO,
.id = CODEC_ID_DPX,
.priv_data_size = sizeof(DPXContext),
.init = encode_init,
.encode = 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"),
};
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