diff mbox

[FFmpeg-devel] Add FITS Demuxer

Message ID 1497886658-3500-1-git-send-email-paraschadha18@gmail.com
State Superseded
Headers show

Commit Message

Paras June 19, 2017, 3:37 p.m. UTC
Signed-off-by: Paras Chadha <paraschadha18@gmail.com>
---
 Changelog                |   2 +-
 libavformat/Makefile     |   1 +
 libavformat/allformats.c |   1 +
 libavformat/fitsdec.c    | 207 +++++++++++++++++++++++++++++++++++++++++++++++
 libavformat/version.h    |   2 +-
 5 files changed, 211 insertions(+), 2 deletions(-)
 create mode 100644 libavformat/fitsdec.c
diff mbox

Patch

diff --git a/Changelog b/Changelog
index a07644c..77361e6 100644
--- a/Changelog
+++ b/Changelog
@@ -22,7 +22,7 @@  version <next>:
 - headphone audio filter
 - superequalizer audio filter
 - roberts video filter
-- FITS decoder
+- FITS demuxer and decoder
 
 version 3.3:
 - CrystalHD decoder moved to new decode API
diff --git a/libavformat/Makefile b/libavformat/Makefile
index 80aeed2..1d43c05 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 a0e2fb8..74a2e15 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..4a9fe87
--- /dev/null
+++ b/libavformat/fitsdec.c
@@ -0,0 +1,207 @@ 
+/*
+ * 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"
+
+typedef struct FITSContext {
+    const AVClass *class;
+    AVRational framerate;
+    int image;
+    int64_t pts;
+} FITSContext;
+
+static int fits_probe(AVProbeData *p)
+{
+    const uint8_t *b = p->buf;
+
+    if (AV_RB32(b) == 0x53494d50 && AV_RB16(b+4) == 0x4c45)
+        return AVPROBE_SCORE_MAX - 1;
+    return 0;
+}
+
+static int fits_read_header(AVFormatContext *s)
+{
+    AVStream *st = avformat_new_stream(s, NULL);
+    FITSContext * fits = s->priv_data;
+
+    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;
+    return 0;
+}
+
+static int64_t find_size(AVIOContext * pb, FITSContext * fits)
+{
+    int bitpix, naxis, dim_no, i, naxisn[999], groups=0;
+    int64_t header_size = 0, data_size=0, ret, pcount=0, gcount=1, d;
+    char buf[80], c;
+
+    if ((ret = avio_read(pb, buf, 80)) != 80)
+        return AVERROR_EOF;
+    if (!strncmp(buf, "SIMPLE", 6) || !strncmp(buf, "XTENSION= 'IMAGE", 16)) {
+        fits->image = 1;
+    } else {
+        fits->image = 0;
+    }
+    header_size += 80;
+
+    if ((ret = avio_read(pb, buf, 80)) != 80)
+        return AVERROR_EOF;
+    if (sscanf(buf, "BITPIX = %d", &bitpix) != 1)
+        return AVERROR_INVALIDDATA;
+    header_size += 80;
+
+    if ((ret = avio_read(pb, buf, 80)) != 80)
+        return AVERROR_EOF;
+    if (sscanf(buf, "NAXIS = %d", &naxis) != 1)
+        return AVERROR_INVALIDDATA;
+    header_size += 80;
+
+    for (i = 0; i < naxis; i++) {
+        if ((ret = avio_read(pb, buf, 80)) != 80)
+            return AVERROR_EOF;
+        if (sscanf(buf, "NAXIS%d = %d", &dim_no, &naxisn[i]) != 2 || dim_no != i+1)
+            return AVERROR_INVALIDDATA;
+        header_size += 80;
+    }
+
+    if ((ret = avio_read(pb, buf, 80)) != 80)
+        return AVERROR_EOF;
+    header_size += 80;
+
+    while (strncmp(buf, "END", 3)) {
+        if (sscanf(buf, "PCOUNT = %ld", &d) == 1) {
+            pcount = d;
+        } else if (sscanf(buf, "GCOUNT = %ld", &d) == 1) {
+            gcount = d;
+        } else if (sscanf(buf, "GROUPS = %c", &c) == 1) {
+            if (c == 'T') {
+                groups = 1;
+            }
+        }
+
+        if ((ret = avio_read(pb, buf, 80)) != 80)
+            return AVERROR_EOF;
+        header_size += 80;
+    }
+
+    header_size = ceil(header_size/2880.0)*2880;
+
+    if (groups) {
+        fits->image = 0;
+        if (naxis > 1)
+            data_size = 1;
+        for (i = 1; i < naxis; i++) {
+            data_size *= naxisn[i];
+        }
+    } else if (naxis) {
+        data_size = 1;
+        for (i = 0; i < naxis; i++) {
+            data_size *= naxisn[i];
+        }
+    } else {
+        fits->image = 0;
+    }
+
+    data_size += pcount;
+    data_size *= (abs(bitpix) >> 3) * gcount;
+
+    if (!data_size) {
+        fits->image = 0;
+    } else {
+        data_size = ceil(data_size/2880.0)*2880;
+    }
+
+    return header_size + data_size;
+}
+
+static int fits_read_packet(AVFormatContext *s, AVPacket *pkt)
+{
+    int64_t size=0, pos, ret;
+    FITSContext * fits = s->priv_data;
+
+    fits->image = 0;
+    pos = avio_tell(s->pb);
+    while (!fits->image) {
+        if ((ret = avio_seek(s->pb, pos+size, SEEK_SET)) < 0)
+            return ret;
+
+        if (avio_feof(s->pb))
+            return AVERROR_EOF;
+
+        pos = avio_tell(s->pb);
+        if ((size = find_size(s->pb, fits)) < 0)
+            return size;
+    }
+
+    if ((ret = avio_seek(s->pb, pos, SEEK_SET)) < 0)
+        return ret;
+
+    ret = av_get_packet(s->pb, pkt, size);
+    if (ret != size) {
+        if (ret > 0) av_packet_unref(pkt);
+        return AVERROR(EIO);
+    }
+
+    pkt->stream_index = 0;
+    pkt->flags |= AV_PKT_FLAG_KEY;
+    pkt->pos = pos;
+    pkt->size = size;
+    pkt->pts = fits->pts;
+    fits->pts++;
+
+    return size;
+}
+
+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 b00a8b0..1fb8ffb 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  73
+#define LIBAVFORMAT_VERSION_MINOR  74
 #define LIBAVFORMAT_VERSION_MICRO 100
 
 #define LIBAVFORMAT_VERSION_INT AV_VERSION_INT(LIBAVFORMAT_VERSION_MAJOR, \