hdrenc.c

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/*
 * Radiance HDR image format
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg 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.
 *
 * FFmpeg 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 FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */
 
#include "libavutil/mem.h"
#include "avcodec.h"
#include "bytestream.h"
#include "codec_internal.h"
#include "encode.h"
 
typedef struct HDREncContext {
    uint8_t *scanline;
} HDREncContext;
 
static av_cold int hdr_encode_init(AVCodecContext *avctx)
{
    HDREncContext *s = avctx->priv_data;
 
    s->scanline = av_calloc(avctx->width * 4, sizeof(*s->scanline));
    if (!s->scanline)
        return AVERROR(ENOMEM);
 
    return 0;
}
 
static av_cold int hdr_encode_close(AVCodecContext *avctx)
{
    HDREncContext *s = avctx->priv_data;
 
    av_freep(&s->scanline);
 
    return 0;
}
 
static void bytestream_put_str(uint8_t **buf, const char *const line)
{
    bytestream_put_buffer(buf, line, strlen(line));
}
 
static void float2rgbe(uint8_t *rgbe, float red, float green, float blue)
{
    float v;
    int e;
 
    v = FFMAX3(red, green, blue);
 
    if (v < 1e-32f) {
        rgbe[0] = rgbe[1] = rgbe[2] = rgbe[3] = 0;