mirror of https://git.ffmpeg.org/ffmpeg.git
190 lines
5.8 KiB
C
190 lines
5.8 KiB
C
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/*
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* Radiance HDR image format
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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/imgutils.h"
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#include "avcodec.h"
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#include "bytestream.h"
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#include "codec_internal.h"
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#include "encode.h"
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typedef struct HDREncContext {
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uint8_t *scanline;
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} HDREncContext;
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static av_cold int hdr_encode_init(AVCodecContext *avctx)
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{
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HDREncContext *s = avctx->priv_data;
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s->scanline = av_calloc(avctx->width * 4, sizeof(*s->scanline));
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if (!s->scanline)
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return AVERROR(ENOMEM);
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return 0;
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}
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static av_cold int hdr_encode_close(AVCodecContext *avctx)
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{
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HDREncContext *s = avctx->priv_data;
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av_freep(&s->scanline);
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return 0;
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}
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static void bytestream_put_str(uint8_t **buf, const char *const line)
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{
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bytestream_put_buffer(buf, line, strlen(line));
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}
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static void float2rgbe(uint8_t *rgbe, float red, float green, float blue)
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{
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float v;
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int e;
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v = FFMAX3(red, green, blue);
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if (v < 1e-32f) {
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rgbe[0] = rgbe[1] = rgbe[2] = rgbe[3] = 0;
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} else {
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v = frexpf(v, &e) * 256.f / v;
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rgbe[0] = av_clip_uint8(red * v);
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rgbe[1] = av_clip_uint8(green * v);
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rgbe[2] = av_clip_uint8(blue * v);
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rgbe[3] = av_clip_uint8(e + 128);
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}
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}
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static void rle(uint8_t **buffer, const uint8_t *data, int width)
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{
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#define MIN_RLE 4
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int cur = 0;
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while (cur < width) {
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int run_count = 0, old_run_count = 0;
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int beg_run = cur;
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uint8_t buf[2];
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while (run_count < MIN_RLE && beg_run < width) {
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beg_run += run_count;
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old_run_count = run_count;
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run_count = 1;
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while ((beg_run + run_count < width) && (run_count < 127) &&
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(data[beg_run * 4] == data[(beg_run + run_count) * 4]))
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run_count++;
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}
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if ((old_run_count > 1) && (old_run_count == beg_run - cur)) {
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buf[0] = 128 + old_run_count;
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buf[1] = data[cur * 4];
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bytestream_put_buffer(buffer, buf, sizeof(buf));
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cur = beg_run;
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}
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while (cur < beg_run) {
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int nonrun_count = FFMIN(128, beg_run - cur);
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buf[0] = nonrun_count;
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bytestream_put_byte(buffer, buf[0]);
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for (int n = 0; n < nonrun_count; n++)
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bytestream_put_byte(buffer, data[(cur + n) * 4]);
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cur += nonrun_count;
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}
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if (run_count >= MIN_RLE) {
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buf[0] = 128 + run_count;
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buf[1] = data[beg_run * 4];
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bytestream_put_buffer(buffer, buf, sizeof(buf));
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cur += run_count;
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}
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}
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}
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static int hdr_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
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const AVFrame *frame, int *got_packet)
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{
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HDREncContext *s = avctx->priv_data;
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int64_t packet_size;
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uint8_t *buf;
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int ret;
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packet_size = avctx->width * avctx->height * 4LL + 1024LL;
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if ((ret = ff_get_encode_buffer(avctx, pkt, packet_size, 0)) < 0)
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return ret;
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buf = pkt->data;
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bytestream_put_str(&buf, "#?RADIANCE\n");
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bytestream_put_str(&buf, "SOFTWARE=lavc\n");
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ret = snprintf(buf, 32, "PIXASPECT=%f\n", av_q2d(av_inv_q(avctx->sample_aspect_ratio)));
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if (ret > 0)
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buf += ret;
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bytestream_put_str(&buf, "FORMAT=32-bit_rle_rgbe\n\n");
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ret = snprintf(buf, 32, "-Y %d +X %d\n", avctx->height, avctx->width);
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if (ret > 0)
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buf += ret;
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for (int y = 0; y < avctx->height; y++) {
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const float *red = (const float *)(frame->data[2] + y * frame->linesize[2]);
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const float *green = (const float *)(frame->data[0] + y * frame->linesize[0]);
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const float *blue = (const float *)(frame->data[1] + y * frame->linesize[1]);
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if (avctx->width < 8 || avctx->width > 0x7fff) {
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for (int x = 0; x < avctx->width; x++) {
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float2rgbe(buf, red[x], green[x], blue[x]);
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buf += 4;
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}
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} else {
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bytestream_put_byte(&buf, 2);
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bytestream_put_byte(&buf, 2);
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bytestream_put_byte(&buf, avctx->width >> 8);
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bytestream_put_byte(&buf, avctx->width & 0xFF);
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for (int x = 0; x < avctx->width; x++)
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float2rgbe(s->scanline + 4 * x, red[x], green[x], blue[x]);
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for (int p = 0; p < 4; p++)
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rle(&buf, s->scanline + p, avctx->width);
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}
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}
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pkt->flags |= AV_PKT_FLAG_KEY;
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av_shrink_packet(pkt, buf - pkt->data);
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*got_packet = 1;
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return 0;
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}
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const FFCodec ff_hdr_encoder = {
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.p.name = "hdr",
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.p.long_name = NULL_IF_CONFIG_SMALL("HDR (Radiance RGBE format) image"),
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.priv_data_size = sizeof(HDREncContext),
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.p.type = AVMEDIA_TYPE_VIDEO,
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.p.id = AV_CODEC_ID_RADIANCE_HDR,
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.p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS,
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.init = hdr_encode_init,
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FF_CODEC_ENCODE_CB(hdr_encode_frame),
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.close = hdr_encode_close,
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.p.pix_fmts = (const enum AVPixelFormat[]){
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AV_PIX_FMT_GBRPF32,
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AV_PIX_FMT_NONE
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},
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.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP,
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};
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