[FFmpeg-cvslog] Implement shared parsing of INFO tag in Canopus family
Vittorio Giovara
git at videolan.org
Mon Apr 20 05:27:40 CEST 2015
ffmpeg | branch: master | Vittorio Giovara <vittorio.giovara at gmail.com> | Thu Apr 9 18:11:10 2015 +0200| [e6fb844f7b736e72da364032d251283bce9e63ad] | committer: Vittorio Giovara
Implement shared parsing of INFO tag in Canopus family
Add some bounds checking to CLLC; reduce HQX variable scoping,
add an error message.
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=e6fb844f7b736e72da364032d251283bce9e63ad
---
libavcodec/Makefile | 4 ++--
libavcodec/canopus.c | 63 ++++++++++++++++++++++++++++++++++++++++++++++++++
libavcodec/canopus.h | 32 +++++++++++++++++++++++++
libavcodec/cllc.c | 10 +++++---
libavcodec/hqx.c | 14 +++++------
5 files changed, 111 insertions(+), 12 deletions(-)
diff --git a/libavcodec/Makefile b/libavcodec/Makefile
index f7ab705..180c390 100644
--- a/libavcodec/Makefile
+++ b/libavcodec/Makefile
@@ -156,7 +156,7 @@ OBJS-$(CONFIG_CDXL_DECODER) += cdxl.o
OBJS-$(CONFIG_CINEPAK_DECODER) += cinepak.o
OBJS-$(CONFIG_CLJR_DECODER) += cljrdec.o
OBJS-$(CONFIG_CLJR_ENCODER) += cljrenc.o
-OBJS-$(CONFIG_CLLC_DECODER) += cllc.o
+OBJS-$(CONFIG_CLLC_DECODER) += cllc.o canopus.o
OBJS-$(CONFIG_COOK_DECODER) += cook.o
OBJS-$(CONFIG_COMFORTNOISE_DECODER) += cngdec.o celp_filters.o
OBJS-$(CONFIG_COMFORTNOISE_ENCODER) += cngenc.o
@@ -232,7 +232,7 @@ OBJS-$(CONFIG_HEVC_DECODER) += hevc.o hevc_mvs.o hevc_ps.o hevc_sei.o
hevc_cabac.o hevc_refs.o hevcpred.o \
hevcdsp.o hevc_filter.o
OBJS-$(CONFIG_HNM4_VIDEO_DECODER) += hnm4video.o
-OBJS-$(CONFIG_HQX_DECODER) += hqx.o hqxvlc.o hqxdsp.o
+OBJS-$(CONFIG_HQX_DECODER) += hqx.o hqxvlc.o hqxdsp.o canopus.o
OBJS-$(CONFIG_HUFFYUV_DECODER) += huffyuv.o huffyuvdec.o
OBJS-$(CONFIG_HUFFYUV_ENCODER) += huffyuv.o huffyuvenc.o
OBJS-$(CONFIG_IDCIN_DECODER) += idcinvideo.o
diff --git a/libavcodec/canopus.c b/libavcodec/canopus.c
new file mode 100644
index 0000000..729e7ef
--- /dev/null
+++ b/libavcodec/canopus.c
@@ -0,0 +1,63 @@
+/*
+ * Canopus common routines
+ * Copyright (c) 2015 Vittorio Giovara <vittorio.giovara at gmail.com>
+ *
+ * This file is part of Libav.
+ *
+ * Libav 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.
+ *
+ * Libav 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 Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <stdint.h>
+
+#include "libavutil/rational.h"
+
+#include "avcodec.h"
+#include "bytestream.h"
+#include "canopus.h"
+
+int ff_canopus_parse_info_tag(AVCodecContext *avctx,
+ const uint8_t *src, size_t size)
+{
+ GetByteContext gbc;
+ int par_x, par_y, field_order;
+
+ bytestream2_init(&gbc, src, size);
+
+ /* Parse aspect ratio. */
+ bytestream2_skip(&gbc, 8); // unknown, 16 bits 1
+ par_x = bytestream2_get_le32(&gbc);
+ par_y = bytestream2_get_le32(&gbc);
+ if (par_x && par_y)
+ av_reduce(&avctx->sample_aspect_ratio.num,
+ &avctx->sample_aspect_ratio.den,
+ par_x, par_y, 255);
+
+ /* Short INFO tag (used in CLLC) has only AR data. */
+ if (size == 0x18)
+ return 0;
+
+ bytestream2_skip(&gbc, 16); // unknown RDRT tag
+
+ /* Parse FIEL tag. */
+ bytestream2_skip(&gbc, 8); // 'FIEL' and 4 bytes 0
+ field_order = bytestream2_get_le32(&gbc);
+ switch (field_order) {
+ case 0: avctx->field_order = AV_FIELD_TT; break;
+ case 1: avctx->field_order = AV_FIELD_BB; break;
+ case 2: avctx->field_order = AV_FIELD_PROGRESSIVE; break;
+ }
+
+ return 0;
+}
diff --git a/libavcodec/canopus.h b/libavcodec/canopus.h
new file mode 100644
index 0000000..9e5702d
--- /dev/null
+++ b/libavcodec/canopus.h
@@ -0,0 +1,32 @@
+/*
+ * Canopus common routines
+ * Copyright (c) 2015 Vittorio Giovara <vittorio.giovara at gmail.com>
+ *
+ * This file is part of Libav.
+ *
+ * Libav 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.
+ *
+ * Libav 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 Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef AVCODEC_CANOPUS_H
+#define AVCODEC_CANOPUS_H
+
+#include <stdint.h>
+
+#include "avcodec.h"
+
+int ff_canopus_parse_info_tag(AVCodecContext *avctx,
+ const uint8_t *src, size_t size);
+
+#endif /* AVCODEC_CANOPUS_H */
diff --git a/libavcodec/cllc.c b/libavcodec/cllc.c
index f081c68..578299f 100644
--- a/libavcodec/cllc.c
+++ b/libavcodec/cllc.c
@@ -24,6 +24,7 @@
#include "libavutil/intreadwrite.h"
#include "bswapdsp.h"
+#include "canopus.h"
#include "get_bits.h"
#include "avcodec.h"
#include "internal.h"
@@ -362,7 +363,11 @@ static int cllc_decode_frame(AVCodecContext *avctx, void *data,
GetBitContext gb;
int coding_type, ret;
- /* Skip the INFO header if present */
+ if (avpkt->size < 4 + 4) {
+ av_log(avctx, AV_LOG_ERROR, "Frame is too small %d.\n", avpkt->size);
+ return AVERROR_INVALIDDATA;
+ }
+
info_offset = 0;
info_tag = AV_RL32(src);
if (info_tag == MKTAG('I', 'N', 'F', 'O')) {
@@ -373,11 +378,10 @@ static int cllc_decode_frame(AVCodecContext *avctx, void *data,
info_offset);
return AVERROR_INVALIDDATA;
}
+ ff_canopus_parse_info_tag(avctx, src + 8, info_offset);
info_offset += 8;
src += info_offset;
-
- av_log(avctx, AV_LOG_DEBUG, "Skipping INFO chunk.\n");
}
data_size = (avpkt->size - info_offset) & ~1;
diff --git a/libavcodec/hqx.c b/libavcodec/hqx.c
index 10e640c..de460a5 100644
--- a/libavcodec/hqx.c
+++ b/libavcodec/hqx.c
@@ -24,6 +24,7 @@
#include "libavutil/intreadwrite.h"
#include "avcodec.h"
+#include "canopus.h"
#include "get_bits.h"
#include "internal.h"
@@ -405,29 +406,28 @@ static int hqx_decode_frame(AVCodecContext *avctx, void *data,
{
HQXContext *ctx = avctx->priv_data;
uint8_t *src = avpkt->data;
- uint32_t info_tag, info_offset;
+ uint32_t info_tag;
int data_start;
int i, ret;
- if (avpkt->size < 8)
+ if (avpkt->size < 4 + 4) {
+ av_log(avctx, AV_LOG_ERROR, "Frame is too small %d.\n", avpkt->size);
return AVERROR_INVALIDDATA;
+ }
- /* Skip the INFO header if present */
- info_offset = 0;
info_tag = AV_RL32(src);
if (info_tag == MKTAG('I', 'N', 'F', 'O')) {
- info_offset = AV_RL32(src + 4);
+ int info_offset = AV_RL32(src + 4);
if (info_offset > UINT32_MAX - 8 || info_offset + 8 > avpkt->size) {
av_log(avctx, AV_LOG_ERROR,
"Invalid INFO header offset: 0x%08"PRIX32" is too large.\n",
info_offset);
return AVERROR_INVALIDDATA;
}
+ ff_canopus_parse_info_tag(avctx, src + 8, info_offset);
info_offset += 8;
src += info_offset;
-
- av_log(avctx, AV_LOG_DEBUG, "Skipping INFO chunk.\n");
}
data_start = src - avpkt->data;
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