From: James Almer <jamr...@gmail.com>
As defined in section G.14.3.2.3 of ITU-T H.265, it's required for proper
signaling of MV-HEVC.
Signed-off-by: James Almer <jamr...@gmail.com>
---
libavutil/Makefile | 2 +
libavutil/tdrdi.c | 51 ++++++++++++++
libavutil/tdrdi.h | 164 +++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 217 insertions(+)
create mode 100644 libavutil/tdrdi.c
create mode 100644 libavutil/tdrdi.h
diff --git a/libavutil/Makefile b/libavutil/Makefile
index 9ef118016b..94a56bb72f 100644
--- a/libavutil/Makefile
+++ b/libavutil/Makefile
@@ -85,6 +85,7 @@ HEADERS = adler32.h
\
sha512.h \
spherical.h \
stereo3d.h \
+ tdrdi.h \
threadmessage.h \
time.h \
timecode.h \
@@ -179,6 +180,7 @@ OBJS = adler32.o
\
slicethread.o \
spherical.o \
stereo3d.o \
+ tdrdi.o \
threadmessage.o \
time.o \
timecode.o \
diff --git a/libavutil/tdrdi.c b/libavutil/tdrdi.c
new file mode 100644
index 0000000000..26192a1d2f
--- /dev/null
+++ b/libavutil/tdrdi.c
@@ -0,0 +1,51 @@
+/*
+ * 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
+ */
+
+#include <stddef.h>
+#include <stdint.h>
+
+#include "mem.h"
+#include "tdrdi.h"
+
+AV3DReferenceDisplaysInfo *av_tdrdi_alloc(unsigned int nb_displays, size_t
*out_size)
+{
+ struct TestStruct {
+ AV3DReferenceDisplaysInfo p;
+ AV3DReferenceDisplay b;
+ };
+ const size_t entries_offset = offsetof(struct TestStruct, b);
+ size_t size = entries_offset;
+ AV3DReferenceDisplaysInfo *tdrdi;
+
+ if (nb_displays > (SIZE_MAX - size) / sizeof(AV3DReferenceDisplay))
+ return NULL;
+ size += sizeof(AV3DReferenceDisplay) * nb_displays;
+
+ tdrdi = av_mallocz(size);
+ if (!tdrdi)
+ return NULL;
+
+ tdrdi->num_ref_displays = nb_displays;
+ tdrdi->entry_size = sizeof(AV3DReferenceDisplay);
+ tdrdi->entries_offset = entries_offset;
+
+ if (out_size)
+ *out_size = size;
+
+ return tdrdi;
+}
diff --git a/libavutil/tdrdi.h b/libavutil/tdrdi.h
new file mode 100644
index 0000000000..8dcca42c7b
--- /dev/null
+++ b/libavutil/tdrdi.h
@@ -0,0 +1,164 @@
+/*
+ * 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
+ * @ingroup lavu_video_3d_reference_displays_info
+ * Spherical video
+ */
+
+#ifndef AVUTIL_TDRDI_H
+#define AVUTIL_TDRDI_H
+
+#include <stddef.h>
+#include <stdint.h>
+
+#include "libavutil/avassert.h"
+
+/**
+ * @defgroup lavu_video_3d_reference_displays_info 3D Reference Displays
Information
+ * @ingroup lavu_video
+ *
+ * The 3D Reference Displays Information describes information about the
reference display
+ * width(s) and reference viewing distance(s) as well as information about the
corresponding
+ * reference stereo pair(s).
+ * @{
+ */
+
+#define AV_TDRDI_MAX_NUM_REF_DISPLAY 32
+
+/**
+ * This structure describes information about the reference display width(s)
and reference
+ * viewing distance(s) as well as information about the corresponding
reference stereo pair(s).
+ * See section G.14.3.2.3 of ITU-T H.265 for more information.
+ *
+ * @note The struct must be allocated with av_tdrdi_alloc() and
+ * its size is not a part of the public ABI.
+ */
+typedef struct AV3DReferenceDisplaysInfo {
+ /**
+ * The exponent of the maximum allowable truncation error for
+ * {exponent,mantissa}_ref_display_width as given by
2<sup>(-prec_ref_display_width)</sup>.
+ */
+ uint8_t prec_ref_display_width;
+
+ /**
+ * A flag to indicate the presence of reference viewing distance.
+ * If false, the values of prec_ref_viewing_dist,
exponent_ref_viewing_distance,
+ * and mantissa_ref_viewing_distance are undefined.
+ */
+ uint8_t ref_viewing_distance_flag;
+
+ /**
+ * The exponent of the maximum allowable truncation error for
+ * {exponent,mantissa}_ref_viewing_distance as given by
2<sup>^(-prec_ref_viewing_dist)</sup>.
+ * The value of prec_ref_viewing_dist shall be in the range of 0 to 31,
inclusive.
+ */
+ uint8_t prec_ref_viewing_dist;
+
+ /**
+ * The number of reference displays that are signalled in this struct.
+ * Allowed range is 1 to 32, inclusive.
+ */
+ uint8_t num_ref_displays;
+
+ /**
+ * Offset in bytes from the beginning of this structure at which the array
+ * of reference displays starts.
+ */
+ size_t entries_offset;
+
+ /**
+ * Size of each entry in bytes. May not match sizeof(AV3DReferenceDisplay).
+ */
+ size_t entry_size;
+} AV3DReferenceDisplaysInfo;
+
+/**
+ * Data structure for single deference display information.
+ * It is allocated as a part of AV3DReferenceDisplaysInfo and should be
retrieved with
+ * av_tdrdi_get_display().
+ *
+ * sizeof(AV3DReferenceDisplay) is not a part of the ABI and new fields may be
+ * added to it.
+*/
+typedef struct AV3DReferenceDisplay {
+ /**
+ * The ViewId of the left view of a stereo pair corresponding to the n-th
reference display.
+ */
+ uint16_t left_view_id;
+
+ /**
+ * The ViewId of the left view of a stereo pair corresponding to the n-th
reference display.
+ */
+ uint16_t right_view_id;
+
+ /**
+ * The exponent part of the reference display width of the n-th reference
display.
+ */
+ uint8_t exponent_ref_display_width;
+
+ /**
+ * The mantissa part of the reference display width of the n-th reference
display.
+ */
+ uint8_t mantissa_ref_display_width;
+
+ /**
+ * Tthe exponent part of the reference viewing distance of the n-th
reference display.
+ */
+ uint8_t exponent_ref_viewing_distance;
+
+ /**
+ * The mantissa part of the reference viewing distance of the n-th
reference display.
+ */
+ uint8_t mantissa_ref_viewing_distance;
+
+ /**
+ * An array of flags to indicates that the information about additional
horizontal shift of
+ * the left and right views for the n-th reference display is present.
+ */
+ uint8_t additional_shift_present_flag;
+
+ /**
+ * The recommended additional horizontal shift for a stereo pair
corresponding to the n-th
+ * reference baseline and the n-th reference display.
+ */
+ int16_t num_sample_shift;
+} AV3DReferenceDisplay;
+
+static av_always_inline AV3DReferenceDisplay*
+av_tdrdi_get_display(AV3DReferenceDisplaysInfo *tdrdi, unsigned int idx)
+{
+ av_assert0(idx < tdrdi->num_ref_displays);
+ return (AV3DReferenceDisplay *)((uint8_t *)tdrdi + tdrdi->entries_offset +
+ idx * tdrdi->entry_size);
+}
+
+/**
+ * Allocate a AV3DReferenceDisplaysInfo structure and initialize its fields to
default
+ * values.
+ *
+ * @return the newly allocated struct or NULL on failure
+ */
+AV3DReferenceDisplaysInfo *av_tdrdi_alloc(unsigned int nb_displays, size_t
*size);
+
+/**
+ * @}
+ */
+
+#endif /* AVUTIL_TDRDI_H */
--
2.49.0
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