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+/*
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+ * FITS demuxer
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+ * Copyright (c) 2017 Paras Chadha
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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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+
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+/**
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+ * @file
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+ * FITS demuxer.
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+ */
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+
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+#include "libavutil/intreadwrite.h"
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+#include "internal.h"
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+#include "libavutil/opt.h"
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+#include "libavcodec/fits.h"
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+#include "libavutil/bprint.h"
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+
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+#define FITS_BLOCK_SIZE 2880
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+
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+typedef struct FITSContext {
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+ const AVClass *class;
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+ AVRational framerate;
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+ int first_image;
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+ int64_t pts;
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+} FITSContext;
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+
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+static int fits_probe(AVProbeData *p)
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+{
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+ const uint8_t *b = p->buf;
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+ if (!memcmp(b, "SIMPLE = T", 30))
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+ return AVPROBE_SCORE_MAX - 1;
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+ return 0;
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+}
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+
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+static int fits_read_header(AVFormatContext *s)
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+{
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+ AVStream *st;
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+ FITSContext * fits = s->priv_data;
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+
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+ st = avformat_new_stream(s, NULL);
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+ if (!st)
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+ return AVERROR(ENOMEM);
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+
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+ st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
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+ st->codecpar->codec_id = AV_CODEC_ID_FITS;
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+
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+ avpriv_set_pts_info(st, 64, fits->framerate.den, fits->framerate.num);
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+ fits->pts = 0;
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+ fits->first_image = 1;
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+ return 0;
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+}
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+
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+/**
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+ * Parses header and checks that the current HDU contains image or not
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+ * It also stores the header in the avbuf and stores the size of data part in data_size
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+ * @param s pointer to AVFormat Context
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+ * @param fits pointer to FITSContext
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+ * @param header pointer to FITSHeader
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+ * @param avbuf pointer to AVBPrint to store the header
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+ * @param data_size to store the size of data part
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+ * @return 1 if image found, 0 if any other extension and AVERROR_INVALIDDATA otherwise
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+ */
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+static int64_t is_image(AVFormatContext *s, FITSContext *fits, FITSHeader *header,
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+ AVBPrint *avbuf, uint64_t *data_size)
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+{
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+ int i, ret, image = 0;
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+ char buf[FITS_BLOCK_SIZE] = { 0 };
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+ int64_t buf_size = 0, size = 0, t;
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+
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+ do {
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+ ret = avio_read(s->pb, buf, FITS_BLOCK_SIZE);
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+ if (ret < 0) {
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+ return ret;
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+ } else if (ret < FITS_BLOCK_SIZE) {
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+ return AVERROR_INVALIDDATA;
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+ }
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+
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+ av_bprint_append_data(avbuf, buf, FITS_BLOCK_SIZE);
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+ ret = 0;
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+ buf_size = 0;
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+ while(!ret && buf_size < FITS_BLOCK_SIZE) {
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+ ret = avpriv_fits_header_parse_line(s, header, buf + buf_size, NULL);
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+ buf_size += 80;
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+ }
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+ } while (!ret);
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+ if (ret < 0)
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+ return ret;
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+
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+ image = fits->first_image || header->image_extension;
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+ fits->first_image = 0;
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+
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+ if (header->groups) {
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+ image = 0;
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+ if (header->naxis > 1)
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+ size = 1;
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+ } else if (header->naxis) {
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+ size = header->naxisn[0];
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+ } else {
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+ image = 0;
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+ }
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+
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+ for (i = 1; i < header->naxis; i++) {
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+ if(size && header->naxisn[i] > UINT64_MAX / size)
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+ return AVERROR_INVALIDDATA;
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+ size *= header->naxisn[i];
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+ }
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+
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+ if(header->pcount > UINT64_MAX - size)
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+ return AVERROR_INVALIDDATA;
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+ size += header->pcount;
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+
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+ t = (abs(header->bitpix) >> 3) * ((int64_t) header->gcount);
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+ if(size && t > UINT64_MAX / size)
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+ return AVERROR_INVALIDDATA;
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+ size *= t;
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+
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+ if (!size) {
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+ image = 0;
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+ } else {
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+ if(FITS_BLOCK_SIZE - 1 > UINT64_MAX - size)
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+ return AVERROR_INVALIDDATA;
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+ size = ((size + FITS_BLOCK_SIZE - 1) / FITS_BLOCK_SIZE) * FITS_BLOCK_SIZE;
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+ }
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+ *data_size = size;
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+ return image;
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+}
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+
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+static int fits_read_packet(AVFormatContext *s, AVPacket *pkt)
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+{
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+ int64_t pos, ret;
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+ uint64_t size;
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+ FITSContext *fits = s->priv_data;
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+ FITSHeader header;
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+ AVBPrint avbuf;
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+ char *buf;
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+
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+ if (fits->first_image) {
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+ avpriv_fits_header_init(&header, STATE_SIMPLE);
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+ } else {
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+ avpriv_fits_header_init(&header, STATE_XTENSION);
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+ }
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+
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+ av_bprint_init(&avbuf, FITS_BLOCK_SIZE, AV_BPRINT_SIZE_UNLIMITED);
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+ while ((ret = is_image(s, fits, &header, &avbuf, &size)) == 0) {
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+ pos = avio_skip(s->pb, size);
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+ if (pos < 0)
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+ return pos;
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+
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+ av_bprint_finalize(&avbuf, NULL);
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+ av_bprint_init(&avbuf, FITS_BLOCK_SIZE, AV_BPRINT_SIZE_UNLIMITED);
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+ avpriv_fits_header_init(&header, STATE_XTENSION);
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+ }
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+ if (ret < 0)
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+ goto fail;
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+
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+ if (!av_bprint_is_complete(&avbuf)) {
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+ ret = AVERROR(ENOMEM);
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+ goto fail;
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+ }
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+
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+ // Header is sent with the first line removed...
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+ ret = av_new_packet(pkt, avbuf.len - 80 + size);
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+ if (ret < 0)
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+ goto fail;
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+
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+ pkt->stream_index = 0;
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+ pkt->flags |= AV_PKT_FLAG_KEY;
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+
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+ ret = av_bprint_finalize(&avbuf, &buf);
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+ if (ret < 0) {
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+ av_packet_unref(pkt);
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+ return ret;
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+ }
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+
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+ memcpy(pkt->data, buf + 80, avbuf.len - 80);
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+ pkt->size = avbuf.len - 80;
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+ av_freep(&buf);
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+ ret = avio_read(s->pb, pkt->data + pkt->size, size);
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+ if (ret < 0) {
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+ av_packet_unref(pkt);
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+ return ret;
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+ }
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+
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+ pkt->size += ret;
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+ pkt->pts = fits->pts;
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+ fits->pts++;
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+
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+ return 0;
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+
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+fail:
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+ av_bprint_finalize(&avbuf, NULL);
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+ return ret;
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+}
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+
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+static const AVOption fits_options[] = {
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+ { "framerate", "set the framerate", offsetof(FITSContext, framerate), AV_OPT_TYPE_VIDEO_RATE, {.str = "1"}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM},
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+ { NULL },
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+};
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+
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+static const AVClass fits_demuxer_class = {
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+ .class_name = "FITS demuxer",
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+ .item_name = av_default_item_name,
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+ .option = fits_options,
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+ .version = LIBAVUTIL_VERSION_INT,
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+};
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+
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+AVInputFormat ff_fits_demuxer = {
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+ .name = "fits",
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+ .long_name = NULL_IF_CONFIG_SMALL("Flexible Image Transport System"),
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+ .priv_data_size = sizeof(FITSContext),
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+ .read_probe = fits_probe,
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+ .read_header = fits_read_header,
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+ .read_packet = fits_read_packet,
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+ .priv_class = &fits_demuxer_class,
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+ .raw_codec_id = AV_CODEC_ID_FITS,
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+};
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Paras Chadha