From 207f0cff2ac8e79747eca0de06666bfcd823d4b7 Mon Sep 17 00:00:00 2001 From: Paras Chadha Date: Tue, 29 Aug 2017 22:42:26 +0530 Subject: Add FITS Demuxer Signed-off-by: Paras Chadha --- libavformat/Makefile | 1 + libavformat/allformats.c | 1 + libavformat/fitsdec.c | 231 +++++++++++++++++++++++++++++++++++++++++++++++ libavformat/version.h | 2 +- 4 files changed, 234 insertions(+), 1 deletion(-) create mode 100644 libavformat/fitsdec.c diff --git a/libavformat/Makefile b/libavformat/Makefile index f2b465cfa2..dfae160bee 100644 --- a/libavformat/Makefile +++ b/libavformat/Makefile @@ -164,6 +164,7 @@ OBJS-$(CONFIG_FFMETADATA_MUXER) += ffmetaenc.o OBJS-$(CONFIG_FIFO_MUXER) += fifo.o OBJS-$(CONFIG_FILMSTRIP_DEMUXER) += filmstripdec.o OBJS-$(CONFIG_FILMSTRIP_MUXER) += filmstripenc.o +OBJS-$(CONFIG_FITS_DEMUXER) += fitsdec.o OBJS-$(CONFIG_FLAC_DEMUXER) += flacdec.o rawdec.o \ flac_picture.o \ oggparsevorbis.o \ diff --git a/libavformat/allformats.c b/libavformat/allformats.c index cd8200ea1c..f23a9a06e5 100644 --- a/libavformat/allformats.c +++ b/libavformat/allformats.c @@ -121,6 +121,7 @@ static void register_all(void) REGISTER_MUXDEMUX(FFMETADATA, ffmetadata); REGISTER_MUXER (FIFO, fifo); REGISTER_MUXDEMUX(FILMSTRIP, filmstrip); + REGISTER_DEMUXER (FITS, fits); REGISTER_MUXDEMUX(FLAC, flac); REGISTER_DEMUXER (FLIC, flic); REGISTER_MUXDEMUX(FLV, flv); diff --git a/libavformat/fitsdec.c b/libavformat/fitsdec.c new file mode 100644 index 0000000000..4b288b3903 --- /dev/null +++ b/libavformat/fitsdec.c @@ -0,0 +1,231 @@ +/* + * FITS demuxer + * Copyright (c) 2017 Paras Chadha + * + * 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 + */ + +/** + * @file + * FITS demuxer. + */ + +#include "libavutil/intreadwrite.h" +#include "internal.h" +#include "libavutil/opt.h" +#include "libavcodec/fits.h" +#include "libavutil/bprint.h" + +#define FITS_BLOCK_SIZE 2880 + +typedef struct FITSContext { + const AVClass *class; + AVRational framerate; + int first_image; + int64_t pts; +} FITSContext; + +static int fits_probe(AVProbeData *p) +{ + const uint8_t *b = p->buf; + if (!memcmp(b, "SIMPLE = T", 30)) + return AVPROBE_SCORE_MAX - 1; + return 0; +} + +static int fits_read_header(AVFormatContext *s) +{ + AVStream *st; + FITSContext * fits = s->priv_data; + + st = avformat_new_stream(s, NULL); + if (!st) + return AVERROR(ENOMEM); + + st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO; + st->codecpar->codec_id = AV_CODEC_ID_FITS; + + avpriv_set_pts_info(st, 64, fits->framerate.den, fits->framerate.num); + fits->pts = 0; + fits->first_image = 1; + return 0; +} + +/** + * Parses header and checks that the current HDU contains image or not + * It also stores the header in the avbuf and stores the size of data part in data_size + * @param s pointer to AVFormat Context + * @param fits pointer to FITSContext + * @param header pointer to FITSHeader + * @param avbuf pointer to AVBPrint to store the header + * @param data_size to store the size of data part + * @return 1 if image found, 0 if any other extension and AVERROR_INVALIDDATA otherwise + */ +static int64_t is_image(AVFormatContext *s, FITSContext *fits, FITSHeader *header, + AVBPrint *avbuf, uint64_t *data_size) +{ + int i, ret, image = 0; + char buf[FITS_BLOCK_SIZE] = { 0 }; + int64_t buf_size = 0, size = 0, t; + + do { + ret = avio_read(s->pb, buf, FITS_BLOCK_SIZE); + if (ret < 0) { + return ret; + } else if (ret < FITS_BLOCK_SIZE) { + return AVERROR_INVALIDDATA; + } + + av_bprint_append_data(avbuf, buf, FITS_BLOCK_SIZE); + ret = 0; + buf_size = 0; + while(!ret && buf_size < FITS_BLOCK_SIZE) { + ret = avpriv_fits_header_parse_line(s, header, buf + buf_size, NULL); + buf_size += 80; + } + } while (!ret); + if (ret < 0) + return ret; + + image = fits->first_image || header->image_extension; + fits->first_image = 0; + + if (header->groups) { + image = 0; + if (header->naxis > 1) + size = 1; + } else if (header->naxis) { + size = header->naxisn[0]; + } else { + image = 0; + } + + for (i = 1; i < header->naxis; i++) { + if(size && header->naxisn[i] > UINT64_MAX / size) + return AVERROR_INVALIDDATA; + size *= header->naxisn[i]; + } + + if(header->pcount > UINT64_MAX - size) + return AVERROR_INVALIDDATA; + size += header->pcount; + + t = (abs(header->bitpix) >> 3) * ((int64_t) header->gcount); + if(size && t > UINT64_MAX / size) + return AVERROR_INVALIDDATA; + size *= t; + + if (!size) { + image = 0; + } else { + if(FITS_BLOCK_SIZE - 1 > UINT64_MAX - size) + return AVERROR_INVALIDDATA; + size = ((size + FITS_BLOCK_SIZE - 1) / FITS_BLOCK_SIZE) * FITS_BLOCK_SIZE; + } + *data_size = size; + return image; +} + +static int fits_read_packet(AVFormatContext *s, AVPacket *pkt) +{ + int64_t pos, ret; + uint64_t size; + FITSContext *fits = s->priv_data; + FITSHeader header; + AVBPrint avbuf; + char *buf; + + if (fits->first_image) { + avpriv_fits_header_init(&header, STATE_SIMPLE); + } else { + avpriv_fits_header_init(&header, STATE_XTENSION); + } + + av_bprint_init(&avbuf, FITS_BLOCK_SIZE, AV_BPRINT_SIZE_UNLIMITED); + while ((ret = is_image(s, fits, &header, &avbuf, &size)) == 0) { + pos = avio_skip(s->pb, size); + if (pos < 0) + return pos; + + av_bprint_finalize(&avbuf, NULL); + av_bprint_init(&avbuf, FITS_BLOCK_SIZE, AV_BPRINT_SIZE_UNLIMITED); + avpriv_fits_header_init(&header, STATE_XTENSION); + } + if (ret < 0) + goto fail; + + if (!av_bprint_is_complete(&avbuf)) { + ret = AVERROR(ENOMEM); + goto fail; + } + + // Header is sent with the first line removed... + ret = av_new_packet(pkt, avbuf.len - 80 + size); + if (ret < 0) + goto fail; + + pkt->stream_index = 0; + pkt->flags |= AV_PKT_FLAG_KEY; + + ret = av_bprint_finalize(&avbuf, &buf); + if (ret < 0) { + av_packet_unref(pkt); + return ret; + } + + memcpy(pkt->data, buf + 80, avbuf.len - 80); + pkt->size = avbuf.len - 80; + av_freep(&buf); + ret = avio_read(s->pb, pkt->data + pkt->size, size); + if (ret < 0) { + av_packet_unref(pkt); + return ret; + } + + pkt->size += ret; + pkt->pts = fits->pts; + fits->pts++; + + return 0; + +fail: + av_bprint_finalize(&avbuf, NULL); + return ret; +} + +static const AVOption fits_options[] = { + { "framerate", "set the framerate", offsetof(FITSContext, framerate), AV_OPT_TYPE_VIDEO_RATE, {.str = "1"}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM}, + { NULL }, +}; + +static const AVClass fits_demuxer_class = { + .class_name = "FITS demuxer", + .item_name = av_default_item_name, + .option = fits_options, + .version = LIBAVUTIL_VERSION_INT, +}; + +AVInputFormat ff_fits_demuxer = { + .name = "fits", + .long_name = NULL_IF_CONFIG_SMALL("Flexible Image Transport System"), + .priv_data_size = sizeof(FITSContext), + .read_probe = fits_probe, + .read_header = fits_read_header, + .read_packet = fits_read_packet, + .priv_class = &fits_demuxer_class, + .raw_codec_id = AV_CODEC_ID_FITS, +}; diff --git a/libavformat/version.h b/libavformat/version.h index 94081aca81..3029a5e767 100644 --- a/libavformat/version.h +++ b/libavformat/version.h @@ -32,7 +32,7 @@ // Major bumping may affect Ticket5467, 5421, 5451(compatibility with Chromium) // Also please add any ticket numbers that you believe might be affected here #define LIBAVFORMAT_VERSION_MAJOR 57 -#define LIBAVFORMAT_VERSION_MINOR 78 +#define LIBAVFORMAT_VERSION_MINOR 79 #define LIBAVFORMAT_VERSION_MICRO 100 #define LIBAVFORMAT_VERSION_INT AV_VERSION_INT(LIBAVFORMAT_VERSION_MAJOR, \ -- cgit v1.2.3