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Thu, 27 Jul 2017 12:03:10 -0700 (PDT) Received: from dhcppc9.localdomain ([210.56.98.45]) by smtp.gmail.com with ESMTPSA id a82sm33484839pfc.120.2017.07.27.12.03.08 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 27 Jul 2017 12:03:09 -0700 (PDT) From: Paras Chadha To: ffmpeg-devel@ffmpeg.org Date: Fri, 28 Jul 2017 00:32:59 +0530 Message-Id: <1501182179-12703-1-git-send-email-paraschadha18@gmail.com> X-Mailer: git-send-email 2.4.11 In-Reply-To: <20170721144248.GA82460@phare.normalesup.org> References: <20170721144248.GA82460@phare.normalesup.org> Subject: [FFmpeg-devel] [PATCH] Add FITS Demuxer X-BeenThere: ffmpeg-devel@ffmpeg.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: FFmpeg development discussions and patches List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: FFmpeg development discussions and patches Cc: Paras Chadha MIME-Version: 1.0 Errors-To: ffmpeg-devel-bounces@ffmpeg.org Sender: "ffmpeg-devel" Signed-off-by: Paras Chadha --- Made all the changes suggested. libavformat/Makefile | 1 + libavformat/allformats.c | 1 + libavformat/fitsdec.c | 236 +++++++++++++++++++++++++++++++++++++++++++++++ libavformat/version.h | 2 +- 4 files changed, 239 insertions(+), 1 deletion(-) create mode 100644 libavformat/fitsdec.c -- 2.4.11 diff --git a/libavformat/Makefile b/libavformat/Makefile index b0ef82c..266b77a 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 1ebc142..3c12760 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 0000000..a8e9396 --- /dev/null +++ b/libavformat/fitsdec.c @@ -0,0 +1,236 @@ +/* + * 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; + int image; + int64_t pts; +} FITSContext; + +static int fits_probe(AVProbeData *p) +{ + const uint8_t *b = p->buf; + + if (AV_RB64(b) == 0x53494d504c452020 && + AV_RB64(b + 8) == 0x3D20202020202020 && + AV_RB64(b + 16) == 0x2020202020202020 && + AV_RB48(b + 24) == 0x202020202054) + 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; +} + +static int64_t find_size(AVFormatContext *s, FITSContext *fits, FITSHeader *header, AVBPrint *avbuf) +{ + int i, ret; + char buf[FITS_BLOCK_SIZE] = { 0 }; + int64_t buf_size = 0, data_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_EOF; + } + + 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; + + fits->image = fits->first_image || header->image_extension; + + if (header->groups) { + fits->image = 0; + if (header->naxis > 1) + data_size = 1; + for (i = 1; i < header->naxis; i++) { + if(data_size && header->naxisn[i] > LLONG_MAX / data_size) + return AVERROR_INVALIDDATA; + data_size *= header->naxisn[i]; + } + } else if (header->naxis) { + data_size = 1; + for (i = 0; i < header->naxis; i++) { + if(data_size && header->naxisn[i] > LLONG_MAX / data_size) + return AVERROR_INVALIDDATA; + data_size *= header->naxisn[i]; + } + } else { + fits->image = 0; + } + + if(header->pcount > LLONG_MAX - data_size) + return AVERROR_INVALIDDATA; + data_size += header->pcount; + + t = (abs(header->bitpix) >> 3) * ((int64_t) header->gcount); + if(data_size && t > LLONG_MAX / data_size) + return AVERROR_INVALIDDATA; + data_size *= t; + + if (!data_size) { + fits->image = 0; + } else { + if(2879 > LLONG_MAX - data_size) + return AVERROR_INVALIDDATA; + data_size = ((data_size + 2879) / 2880) * 2880; + } + + return data_size; +} + +static int fits_read_packet(AVFormatContext *s, AVPacket *pkt) +{ + int64_t size=0, pos, ret; + 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); + } + + fits->image = 0; + av_bprint_init(&avbuf, FITS_BLOCK_SIZE, AV_BPRINT_SIZE_UNLIMITED); + size = find_size(s, fits, &header, &avbuf); + fits->first_image = 0; + if (size < 0) { + av_bprint_finalize(&avbuf, NULL); + return size; + } + + while (!fits->image) { + 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); + size = find_size(s, fits, &header, &avbuf); + if (size < 0) { + av_bprint_finalize(&avbuf, NULL); + return size; + } + } + + if (!av_bprint_is_complete(&avbuf)) { + av_bprint_finalize(&avbuf, NULL); + return AVERROR(ENOMEM); + } + + // Header is sent with the first line removed... + ret = av_new_packet(pkt, avbuf.len - 80 + size); + if (ret < 0) { + av_bprint_finalize(&avbuf, NULL); + return ret; + } + pkt->stream_index = 0; + pkt->flags |= AV_PKT_FLAG_KEY; + pkt->pos = pos; + + 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; +} + +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 48b81f2..a8cf4c1 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 76 +#define LIBAVFORMAT_VERSION_MINOR 77 #define LIBAVFORMAT_VERSION_MICRO 100 #define LIBAVFORMAT_VERSION_INT AV_VERSION_INT(LIBAVFORMAT_VERSION_MAJOR, \