[FFmpeg-devel] [PATCH 2/5] ffmpeg: Add display_matrix option

[Thilo Borgmann <thilo.borgmann@mail.de>]

From: Jan Ekström <jeebjp@gmail.com>

This enables overriding the rotation as well as horizontal/vertical
flip state of a specific video stream on the input side.

Additionally, switch the singular test that was utilizing the rotation
metadata to instead override the input display rotation, thus leading
to the same result.
---
 doc/ffmpeg.texi             |  13 +++++
 fftools/cmdutils.h          |   1 +
 fftools/ffmpeg.h            |   2 +
 fftools/ffmpeg_opt.c        | 107 ++++++++++++++++++++++++++++++++++++
 tests/fate/filter-video.mak |   2 +-
 5 files changed, 124 insertions(+), 1 deletion(-)

diff --git a/doc/ffmpeg.texi b/doc/ffmpeg.texi
index 42440d93b4..5d3e3b3052 100644
--- a/doc/ffmpeg.texi
+++ b/doc/ffmpeg.texi
@@ -912,6 +912,19 @@ If used together with @option{-vcodec copy}, it will affect the aspect ratio
 stored at container level, but not the aspect ratio stored in encoded
 frames, if it exists.
 
+@item -display_matrix[:@var{stream_specifier}] @var{opt1=val1[,opt2=val2]...} (@emph{input,per-stream})
+Set the video display matrix according to given options.
+
+@table @option
+@item rotation=@var{number}
+Set the rotation using a floating point number that describes a pure
+counter-clockwise rotation in degrees.
+The @code{-autorotate} logic will be affected.
+@item hflip=@var{[0,1]}
+@item vflip=@var{[0,1]}
+Set a horizontal or vertical flip.
+@end table
+
 @item -vn (@emph{input/output})
 As an input option, blocks all video streams of a file from being filtered or
 being automatically selected or mapped for any output. See @code{-discard}
diff --git a/fftools/cmdutils.h b/fftools/cmdutils.h
index 6a519c6546..df90cc6958 100644
--- a/fftools/cmdutils.h
+++ b/fftools/cmdutils.h
@@ -166,6 +166,7 @@ typedef struct OptionDef {
     } u;
     const char *help;
     const char *argname;
+    const AVClass *args;
 } OptionDef;
 
 /**
diff --git a/fftools/ffmpeg.h b/fftools/ffmpeg.h
index 6991ba7632..0ea730fd42 100644
--- a/fftools/ffmpeg.h
+++ b/fftools/ffmpeg.h
@@ -193,6 +193,8 @@ typedef struct OptionsContext {
     int        nb_force_fps;
     SpecifierOpt *frame_aspect_ratios;
     int        nb_frame_aspect_ratios;
+    SpecifierOpt *display_matrixes;
+    int        nb_display_matrixes;
     SpecifierOpt *rc_overrides;
     int        nb_rc_overrides;
     SpecifierOpt *intra_matrices;
diff --git a/fftools/ffmpeg_opt.c b/fftools/ffmpeg_opt.c
index cc038aae6b..e184b4239c 100644
--- a/fftools/ffmpeg_opt.c
+++ b/fftools/ffmpeg_opt.c
@@ -20,6 +20,7 @@
 
 #include "config.h"
 
+#include <float.h>
 #include <stdint.h>
 
 #if HAVE_SYS_RESOURCE_H
@@ -45,6 +46,7 @@
 #include "libavutil/avutil.h"
 #include "libavutil/bprint.h"
 #include "libavutil/channel_layout.h"
+#include "libavutil/display.h"
 #include "libavutil/getenv_utf8.h"
 #include "libavutil/intreadwrite.h"
 #include "libavutil/fifo.h"
@@ -87,6 +89,7 @@ static const char *const opt_name_forced_key_frames[]         = {"forced_key_fra
 static const char *const opt_name_fps_mode[]                  = {"fps_mode", NULL};
 static const char *const opt_name_force_fps[]                 = {"force_fps", NULL};
 static const char *const opt_name_frame_aspect_ratios[]       = {"aspect", NULL};
+static const char *const opt_name_display_matrixes[]          = {"display_matrix", NULL};
 static const char *const opt_name_rc_overrides[]              = {"rc_override", NULL};
 static const char *const opt_name_intra_matrices[]            = {"intra_matrix", NULL};
 static const char *const opt_name_inter_matrices[]            = {"inter_matrix", NULL};
@@ -112,6 +115,32 @@ static const char *const opt_name_time_bases[]                = {"time_base", NU
 static const char *const opt_name_enc_time_bases[]            = {"enc_time_base", NULL};
 static const char *const opt_name_bits_per_raw_sample[]       = {"bits_per_raw_sample", NULL};
 
+// XXX this should probably go into a seperate file <name>_args.c and #included here
+    struct display_matrix_s {
+        const AVClass *class;
+        double  rotation;
+        int     hflip;
+        int     vflip;
+    };
+#define OFFSET(x) offsetof(struct display_matrix_s, x)
+    static const AVOption display_matrix_args[] = {
+        { "rotation", "set rotation", OFFSET(rotation), AV_OPT_TYPE_DOUBLE,
+            { .dbl = DBL_MAX }, -(DBL_MAX), DBL_MAX - 1.0f, AV_OPT_FLAG_ARGUMENT},
+        { "hflip",    "set hflip", OFFSET(hflip),    AV_OPT_TYPE_BOOL,
+            { .i64 = -1 }, 0, 1, AV_OPT_FLAG_ARGUMENT},
+        { "vflip",    "set vflip", OFFSET(vflip),    AV_OPT_TYPE_BOOL,
+            { .i64 = -1 }, 0, 1, AV_OPT_FLAG_ARGUMENT},
+        { NULL },
+    };
+    static const AVClass class_display_matrix_args = {
+        .class_name = "display_matrix_args",
+        .item_name  = av_default_item_name,
+        .option     = display_matrix_args,
+        .version    = LIBAVUTIL_VERSION_INT,
+    };
+#undef OFFSET
+// XXX
+
 #define WARN_MULTIPLE_OPT_USAGE(name, type, so, st)\
 {\
     char namestr[128] = "";\
@@ -808,6 +837,75 @@ static int opt_recording_timestamp(void *optctx, const char *opt, const char *ar
     return 0;
 }
 
+static void add_display_matrix_to_stream(OptionsContext *o,
+                                         AVFormatContext *ctx, AVStream *st)
+{
+    int hflip_set = 0, vflip_set = 0, display_rotation_set = 0;
+    uint8_t *buf = NULL;
+
+    static struct display_matrix_s test_args = {
+        .class    = &class_display_matrix_args,
+        .rotation = DBL_MAX,
+        .hflip    = -1,
+        .vflip    = -1,
+    };
+
+    AVDictionary *global_args = NULL;
+    AVDictionary *local_args  = NULL;
+    AVDictionaryEntry *en = NULL;
+
+    MATCH_PER_STREAM_OPT(display_matrixes, dict, global_args, ctx, st);
+
+    if (!global_args)
+        return;
+
+    // make a copy of the dict so it doesn't get freed from underneath us
+    if (av_dict_copy(&local_args, global_args, 0) < 0) {
+        av_log(NULL, AV_LOG_FATAL,
+               "Failed to copy argument dict for display matrix!\n");
+    }
+
+    if (av_opt_set_dict2(&test_args, &local_args, 0) < 0) {
+        av_log(NULL, AV_LOG_FATAL,
+               "Failed to set options for a display matrix!\n");
+        exit_program(1);
+    }
+
+    while ((en = av_dict_get(local_args, "", en, AV_DICT_IGNORE_SUFFIX))) {
+        av_log(NULL, AV_LOG_FATAL,
+               "Unknown option=value pair for display matrix: "
+               "key: '%s', value: '%s'!\n",
+               en->key, en->value);
+    }
+
+    if (av_dict_count(local_args)) {
+        exit_program(1);
+    }
+
+    av_dict_free(&local_args);
+
+    display_rotation_set = test_args.rotation != DBL_MAX;
+    hflip_set            = test_args.hflip != -1;
+    vflip_set            = test_args.vflip != -1;
+
+    if (!display_rotation_set && !hflip_set && !vflip_set)
+        return;
+
+    if (!(buf = av_stream_new_side_data(st, AV_PKT_DATA_DISPLAYMATRIX,
+                                        sizeof(int32_t) * 9))) {
+        av_log(NULL, AV_LOG_FATAL, "Failed to generate a display matrix!\n");
+        exit_program(1);
+    }
+
+    av_display_rotation_set((int32_t *)buf,
+                            display_rotation_set ? -(test_args.rotation) :
+                                                   -0.0f);
+    av_display_matrix_flip((int32_t *)buf,
+                           hflip_set ? test_args.hflip : 0,
+                           vflip_set ? test_args.vflip : 0);
+}
+
+
 static const AVCodec *find_codec_or_die(const char *name, enum AVMediaType type, int encoder)
 {
     const AVCodecDescriptor *desc;
@@ -942,6 +1040,8 @@ static void add_input_streams(OptionsContext *o, AVFormatContext *ic)
         }
 
         if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
+            add_display_matrix_to_stream(o, ic, st);
+
             MATCH_PER_STREAM_OPT(hwaccels, str, hwaccel, ic, st);
             MATCH_PER_STREAM_OPT(hwaccel_output_formats, str,
                                  hwaccel_output_format, ic, st);
@@ -1865,6 +1965,8 @@ static OutputStream *new_video_stream(OptionsContext *o, AVFormatContext *oc, in
         ost->frame_aspect_ratio = q;
     }
 
+    add_display_matrix_to_stream(o, oc, st);
+
     MATCH_PER_STREAM_OPT(filter_scripts, str, ost->filters_script, oc, st);
     MATCH_PER_STREAM_OPT(filters,        str, ost->filters,        oc, st);
 
@@ -3992,6 +4094,11 @@ const OptionDef options[] = {
     { "aspect",       OPT_VIDEO | HAS_ARG  | OPT_STRING | OPT_SPEC |
                       OPT_OUTPUT,                                                { .off = OFFSET(frame_aspect_ratios) },
         "set aspect ratio (4:3, 16:9 or 1.3333, 1.7777)", "aspect" },
+    { "display_matrix", OPT_VIDEO | HAS_ARG | OPT_DICT | OPT_SPEC |
+                        OPT_INPUT,                                              { .off = OFFSET(display_matrixes) },
+        "define a display matrix with rotation and/or horizontal/vertical "
+        "flip for stream(s)",
+        "arguments", &class_display_matrix_args },
     { "pix_fmt",      OPT_VIDEO | HAS_ARG | OPT_EXPERT  | OPT_STRING | OPT_SPEC |
                       OPT_INPUT | OPT_OUTPUT,                                    { .off = OFFSET(frame_pix_fmts) },
         "set pixel format", "format" },
diff --git a/tests/fate/filter-video.mak b/tests/fate/filter-video.mak
index 372c70bba7..763390ea51 100644
--- a/tests/fate/filter-video.mak
+++ b/tests/fate/filter-video.mak
@@ -691,7 +691,7 @@ fate-filter-metadata-avf-aphase-meter-out-of-phase: SRC = $(TARGET_SAMPLES)/filt
 fate-filter-metadata-avf-aphase-meter-out-of-phase: CMD = run $(FILTER_METADATA_COMMAND) "amovie='$(SRC)',aphasemeter=video=0"
 
 FATE_FILTER_SAMPLES-$(call TRANSCODE, RAWVIDEO H264, MOV, ARESAMPLE_FILTER  AAC_FIXED_DECODER) += fate-filter-meta-4560-rotate0
-fate-filter-meta-4560-rotate0: CMD = transcode mov $(TARGET_SAMPLES)/filter/sample-in-issue-505.mov mov "-c copy -metadata:s:v:0 rotate=0" "-af aresample" "" "" "-flags +bitexact -c:a aac_fixed"
+fate-filter-meta-4560-rotate0: CMD = transcode "mov -display_matrix:v:0 rotation=0" $(TARGET_SAMPLES)/filter/sample-in-issue-505.mov mov "-c copy" "-af aresample" "" "" "-flags +bitexact -c:a aac_fixed"
 
 FATE_FILTER_CMP_METADATA-$(CONFIG_BLOCKDETECT_FILTER) += fate-filter-refcmp-blockdetect-yuv
 fate-filter-refcmp-blockdetect-yuv: CMD = cmp_metadata blockdetect yuv420p 0.015
-- 
2.20.1 (Apple Git-117)

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