mirror of
https://git.videolan.org/git/ffmpeg.git
synced 2024-08-28 20:26:14 +02:00
232 lines
6.3 KiB
C
232 lines
6.3 KiB
C
/*
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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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* @file
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* FITS demuxer.
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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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#define FITS_BLOCK_SIZE 2880
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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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static int fits_probe(const 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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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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st = avformat_new_stream(s, NULL);
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if (!st)
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return AVERROR(ENOMEM);
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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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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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* 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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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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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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image = fits->first_image || header->image_extension;
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fits->first_image = 0;
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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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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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if(header->pcount > UINT64_MAX - size)
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return AVERROR_INVALIDDATA;
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size += header->pcount;
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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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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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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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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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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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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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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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// 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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pkt->stream_index = 0;
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pkt->flags |= AV_PKT_FLAG_KEY;
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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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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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pkt->size += ret;
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pkt->pts = fits->pts;
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fits->pts++;
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return 0;
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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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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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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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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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