mirror of
https://git.ffmpeg.org/ffmpeg.git
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137 lines
3.9 KiB
C
137 lines
3.9 KiB
C
/*
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* DPX (.dpx) image encoder
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* Copyright (c) 2011 Peter Ross <pross@xvid.org>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "libavutil/intreadwrite.h"
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#include "libavutil/imgutils.h"
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#include "avcodec.h"
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typedef struct DPXContext {
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AVFrame picture;
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int big_endian;
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int bits_per_component;
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int descriptor;
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} DPXContext;
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static av_cold int encode_init(AVCodecContext *avctx)
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{
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DPXContext *s = avctx->priv_data;
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avctx->coded_frame = &s->picture;
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avctx->coded_frame->pict_type = FF_I_TYPE;
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avctx->coded_frame->key_frame = 1;
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s->big_endian = 1;
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s->bits_per_component = 8;
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s->descriptor = 50; /* RGB */
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switch (avctx->pix_fmt) {
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case PIX_FMT_RGB24:
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break;
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case PIX_FMT_RGBA:
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s->descriptor = 51; /* RGBA */
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break;
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case PIX_FMT_RGB48LE:
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s->big_endian = 0;
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case PIX_FMT_RGB48BE:
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s->bits_per_component = avctx->bits_per_raw_sample ? avctx->bits_per_raw_sample : 16;
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break;
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default:
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av_log(avctx, AV_LOG_INFO, "unsupported pixel format\n");
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return -1;
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}
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return 0;
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}
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#define write16(p, value) \
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do { \
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if (s->big_endian) AV_WB16(p, value); \
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else AV_WL16(p, value); \
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} while(0)
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#define write32(p, value) \
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do { \
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if (s->big_endian) AV_WB32(p, value); \
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else AV_WL32(p, value); \
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} while(0)
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static int encode_frame(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data)
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{
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DPXContext *s = avctx->priv_data;
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int size;
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#define HEADER_SIZE 1664 /* DPX Generic header */
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if (buf_size < HEADER_SIZE)
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return -1;
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memset(buf, 0, HEADER_SIZE);
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/* File information header */
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write32(buf, MKBETAG('S','D','P','X'));
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write32(buf + 4, HEADER_SIZE);
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memcpy (buf + 8, "V1.0", 4);
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write32(buf + 20, 1); /* new image */
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write32(buf + 24, HEADER_SIZE);
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memcpy (buf + 160, LIBAVCODEC_IDENT, FFMIN(sizeof(LIBAVCODEC_IDENT), 100));
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write32(buf + 660, 0xFFFFFFFF); /* unencrypted */
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/* Image information header */
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write16(buf + 768, 0); /* orientation; left to right, top to bottom */
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write16(buf + 770, 1); /* number of elements */
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write32(buf + 772, avctx->width);
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write32(buf + 776, avctx->height);
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buf[800] = s->descriptor;
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buf[801] = 2; /* linear transfer */
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buf[802] = 2; /* linear colorimetric */
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buf[803] = s->bits_per_component;
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/* Image source information header */
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write32(buf + 1628, avctx->sample_aspect_ratio.num);
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write32(buf + 1632, avctx->sample_aspect_ratio.den);
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size = avpicture_layout((AVPicture*)data, avctx->pix_fmt,
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avctx->width, avctx->height,
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buf + HEADER_SIZE, buf_size - HEADER_SIZE);
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if (size < 0)
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return size;
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size += HEADER_SIZE;
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write32(buf + 16, size); /* file size */
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return size;
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}
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AVCodec ff_dpx_encoder = {
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"dpx",
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AVMEDIA_TYPE_VIDEO,
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CODEC_ID_DPX,
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sizeof(DPXContext),
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encode_init,
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encode_frame,
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.pix_fmts= (const enum PixelFormat[]){
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PIX_FMT_RGB24,
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PIX_FMT_RGBA,
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PIX_FMT_RGB48LE,
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PIX_FMT_RGB48BE,
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PIX_FMT_NONE},
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.long_name = NULL_IF_CONFIG_SMALL("DPX image"),
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};
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