mirror of
https://github.com/FFmpeg/FFmpeg.git
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224 lines
6.5 KiB
C
224 lines
6.5 KiB
C
/*
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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 "avcodec.h"
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#include "bytestream.h"
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#include "codec_internal.h"
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#include "decode.h"
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#include "thread.h"
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#define MINELEN 8
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#define MAXELEN 0x7fff
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static int hdr_get_line(GetByteContext *gb, uint8_t *buffer, int size)
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{
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int n = 0, c;
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memset(buffer, 0, size);
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do {
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c = bytestream2_get_byte(gb);
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if (n < size - 1)
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buffer[n++] = c;
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} while (bytestream2_get_bytes_left(gb) > 0 && c != '\n');
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return 0;
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}
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static float convert(int expo, int val)
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{
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if (expo == -128) {
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return 0.f;
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} else {
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const float v = val / 256.f;
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return ldexpf(v, expo);
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}
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}
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static int decompress(uint8_t *scanline, int w, GetByteContext *gb, const uint8_t *start)
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{
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int rshift = 0;
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while (w > 0) {
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scanline[0] = bytestream2_get_byte(gb);
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scanline[1] = bytestream2_get_byte(gb);
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scanline[2] = bytestream2_get_byte(gb);
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scanline[3] = bytestream2_get_byte(gb);
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if (scanline[0] == 1 &&
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scanline[1] == 1 &&
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scanline[2] == 1) {
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int run = scanline[3];
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for (int i = run << rshift; i > 0 && w > 0 && scanline >= start + 4; i--) {
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memcpy(scanline, scanline - 4, 4);
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scanline += 4;
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w -= 4;
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}
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rshift += 8;
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if (rshift > 16)
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break;
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} else {
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scanline += 4;
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w--;
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rshift = 0;
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}
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}
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return 1;
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}
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static int hdr_decode_frame(AVCodecContext *avctx, AVFrame *p,
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int *got_frame, AVPacket *avpkt)
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{
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int width = 0, height = 0;
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GetByteContext gb;
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uint8_t line[512];
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float sar;
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int ret;
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bytestream2_init(&gb, avpkt->data, avpkt->size);
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hdr_get_line(&gb, line, sizeof(line));
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if (memcmp("#?RADIANCE\n", line, 11))
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return AVERROR_INVALIDDATA;
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do {
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hdr_get_line(&gb, line, sizeof(line));
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if (sscanf(line, "PIXASPECT=%f\n", &sar) == 1)
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avctx->sample_aspect_ratio = p->sample_aspect_ratio = av_inv_q(av_d2q(sar, 4096));
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} while (line[0] != '\n' && line[0]);
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hdr_get_line(&gb, line, sizeof(line));
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if (sscanf(line, "-Y %d +X %d\n", &height, &width) == 2) {
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;
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} else if (sscanf(line, "+Y %d +X %d\n", &height, &width) == 2) {
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;
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} else if (sscanf(line, "-Y %d -X %d\n", &height, &width) == 2) {
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;
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} else if (sscanf(line, "+Y %d -X %d\n", &height, &width) == 2) {
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;
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} else if (sscanf(line, "-X %d +Y %d\n", &width, &height) == 2) {
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;
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} else if (sscanf(line, "+X %d +Y %d\n", &width, &height) == 2) {
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;
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} else if (sscanf(line, "-X %d -Y %d\n", &width, &height) == 2) {
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;
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} else if (sscanf(line, "+X %d -Y %d\n", &width, &height) == 2) {
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;
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}
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if ((ret = ff_set_dimensions(avctx, width, height)) < 0)
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return ret;
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avctx->pix_fmt = AV_PIX_FMT_GBRPF32;
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if (avctx->skip_frame >= AVDISCARD_ALL)
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return avpkt->size;
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if ((ret = ff_thread_get_buffer(avctx, p, 0)) < 0)
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return ret;
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for (int y = 0; y < height; y++) {
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float *dst_r = (float *)(p->data[2] + y * p->linesize[2]);
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float *dst_g = (float *)(p->data[0] + y * p->linesize[0]);
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float *dst_b = (float *)(p->data[1] + y * p->linesize[1]);
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uint8_t *scanline = p->data[0] + y * p->linesize[0];
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int i;
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if (width < MINELEN || width > MAXELEN) {
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decompress(scanline, width, &gb, scanline);
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goto convert;
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}
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i = bytestream2_peek_byte(&gb);
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if (i != 2) {
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decompress(scanline, width, &gb, scanline);
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goto convert;
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}
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bytestream2_skip(&gb, 1);
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scanline[1] = bytestream2_get_byte(&gb);
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scanline[2] = bytestream2_get_byte(&gb);
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i = bytestream2_get_byte(&gb);
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if (scanline[1] != 2 || scanline[2] & 128) {
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scanline[0] = 2;
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scanline[3] = i;
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decompress(scanline + 4, width - 1, &gb, scanline);
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goto convert;
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}
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for (int i = 0; i < 4; i++) {
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uint8_t *scanline = p->data[0] + y * p->linesize[0] + i;
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for (int j = 0; j < width * 4 && bytestream2_get_bytes_left(&gb) > 0;) {
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int run = bytestream2_get_byte(&gb);
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if (run > 128) {
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uint8_t val = bytestream2_get_byte(&gb);
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run &= 127;
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while (run--) {
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if (j >= width * 4)
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break;
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scanline[j] = val;
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j += 4;
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}
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} else if (run > 0) {
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while (run--) {
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if (j >= width * 4)
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break;
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scanline[j] = bytestream2_get_byte(&gb);
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j += 4;
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}
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}
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}
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}
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convert:
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for (int x = 0; x < width; x++) {
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uint8_t rgbe[4];
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int expo;
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memcpy(rgbe, p->data[0] + y * p->linesize[0] + x * 4, 4);
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expo = rgbe[3] - 128;
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dst_r[x] = convert(expo, rgbe[0]);
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dst_b[x] = convert(expo, rgbe[2]);
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dst_g[x] = convert(expo, rgbe[1]);
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}
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}
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p->key_frame = 1;
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p->pict_type = AV_PICTURE_TYPE_I;
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*got_frame = 1;
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return avpkt->size;
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}
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const FFCodec ff_hdr_decoder = {
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.p.name = "hdr",
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CODEC_LONG_NAME("HDR (Radiance RGBE format) image"),
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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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.caps_internal = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
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FF_CODEC_DECODE_CB(hdr_decode_frame),
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};
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