spherical: Add tiled equirectangular type and projection-specific properties

Signed-off-by: Vittorio Giovara <vittorio.giovara@gmail.com>

doc/APIchanges

@@ -15,6 +15,11 @@ libavutil:     2015-08-28
 
 API changes, most recent first:
 
+2017-02-10 - xxxxxxx - lavu 55.48.100 / 55.33.0 - spherical.h
+  Add AV_SPHERICAL_EQUIRECTANGULAR_TILE, av_spherical_tile_bounds(),
+  and projection-specific properties (bound_left, bound_top, bound_right,
+  bound_bottom, padding) to AVSphericalMapping.
+
 2017-03-02 - xxxxxxx - lavc 57.81.104 - videotoolbox.h
   AVVideotoolboxContext.cv_pix_fmt_type can now be set to 0 to output the
   native decoder format. (The default value is not changed.)

ffprobe.c

@@ -1762,6 +1762,7 @@ static inline int show_tags(WriterContext *w, AVDictionary *tags, int section_id
 }
 
 static void print_pkt_side_data(WriterContext *w,
+                                AVCodecParameters *par,
                                 const AVPacketSideData *side_data,
                                 int nb_side_data,
                                 SectionID id_data_list,
@@ -1788,9 +1789,19 @@ static void print_pkt_side_data(WriterContext *w,
             const AVSphericalMapping *spherical = (AVSphericalMapping *)sd->data;
             if (spherical->projection == AV_SPHERICAL_EQUIRECTANGULAR)
                 print_str("projection", "equirectangular");
-            else if (spherical->projection == AV_SPHERICAL_CUBEMAP)
+            else if (spherical->projection == AV_SPHERICAL_CUBEMAP) {
                 print_str("projection", "cubemap");
-            else
+                print_int("padding", spherical->padding);
+            } else if (spherical->projection == AV_SPHERICAL_EQUIRECTANGULAR_TILE) {
+                size_t l, t, r, b;
+                av_spherical_tile_bounds(spherical, par->width, par->height,
+                                         &l, &t, &r, &b);
+                print_str("projection", "tiled equirectangular");
+                print_int("bound_left", l);
+                print_int("bound_top", t);
+                print_int("bound_right", r);
+                print_int("bound_bottom", b);
+            } else
                 print_str("projection", "unknown");
 
             print_int("yaw", (double) spherical->yaw / (1 << 16));
@@ -1843,7 +1854,7 @@ static void show_packet(WriterContext *w, InputFile *ifile, AVPacket *pkt, int p
             av_dict_free(&dict);
         }
 
-        print_pkt_side_data(w, pkt->side_data, pkt->side_data_elems,
+        print_pkt_side_data(w, st->codecpar, pkt->side_data, pkt->side_data_elems,
                             SECTION_ID_PACKET_SIDE_DATA_LIST,
                             SECTION_ID_PACKET_SIDE_DATA);
     }
@@ -2404,7 +2415,7 @@ static int show_stream(WriterContext *w, AVFormatContext *fmt_ctx, int stream_id
         ret = show_tags(w, stream->metadata, in_program ? SECTION_ID_PROGRAM_STREAM_TAGS : SECTION_ID_STREAM_TAGS);
 
     if (stream->nb_side_data) {
-        print_pkt_side_data(w, stream->side_data, stream->nb_side_data,
+        print_pkt_side_data(w, stream->codecpar, stream->side_data, stream->nb_side_data,
                             SECTION_ID_STREAM_SIDE_DATA_LIST,
                             SECTION_ID_STREAM_SIDE_DATA);
     }

libavformat/dump.c

@@ -343,7 +343,7 @@ static void dump_mastering_display_metadata(void *ctx, AVPacketSideData* sd) {
            av_q2d(metadata->min_luminance), av_q2d(metadata->max_luminance));
 }
 
-static void dump_spherical(void *ctx, AVPacketSideData *sd)
+static void dump_spherical(void *ctx, AVCodecParameters *par, AVPacketSideData *sd)
 {
     AVSphericalMapping *spherical = (AVSphericalMapping *)sd->data;
     double yaw, pitch, roll;
@@ -357,6 +357,8 @@ static void dump_spherical(void *ctx, AVPacketSideData *sd)
         av_log(ctx, AV_LOG_INFO, "equirectangular ");
     else if (spherical->projection == AV_SPHERICAL_CUBEMAP)
         av_log(ctx, AV_LOG_INFO, "cubemap ");
+    else if (spherical->projection == AV_SPHERICAL_EQUIRECTANGULAR_TILE)
+        av_log(ctx, AV_LOG_INFO, "tiled equirectangular ");
     else {
         av_log(ctx, AV_LOG_WARNING, "unknown");
         return;
@@ -366,6 +368,15 @@ static void dump_spherical(void *ctx, AVPacketSideData *sd)
     pitch = ((double)spherical->pitch) / (1 << 16);
     roll = ((double)spherical->roll) / (1 << 16);
     av_log(ctx, AV_LOG_INFO, "(%f/%f/%f) ", yaw, pitch, roll);
+
+    if (spherical->projection == AV_SPHERICAL_EQUIRECTANGULAR_TILE) {
+        size_t l, t, r, b;
+        av_spherical_tile_bounds(spherical, par->width, par->height,
+                                 &l, &t, &r, &b);
+        av_log(ctx, AV_LOG_INFO, "[%zu, %zu, %zu, %zu] ", l, t, r, b);
+    } else if (spherical->projection == AV_SPHERICAL_CUBEMAP) {
+        av_log(ctx, AV_LOG_INFO, "[pad %zu] ", spherical->padding);
+    }
 }
 
 static void dump_sidedata(void *ctx, AVStream *st, const char *indent)
@@ -421,7 +432,7 @@ static void dump_sidedata(void *ctx, AVStream *st, const char *indent)
             break;
         case AV_PKT_DATA_SPHERICAL:
             av_log(ctx, AV_LOG_INFO, "spherical: ");
-            dump_spherical(ctx, &sd);
+            dump_spherical(ctx, st->codecpar, &sd);
             break;
         default:
             av_log(ctx, AV_LOG_INFO,

libavutil/spherical.c

@@ -32,3 +32,21 @@ AVSphericalMapping *av_spherical_alloc(size_t *size)
 
     return spherical;
 }
+
+void av_spherical_tile_bounds(AVSphericalMapping *map,
+                              size_t width, size_t height,
+                              size_t *left, size_t *top,
+                              size_t *right, size_t *bottom)
+{
+    /* conversion from 0.32 coordinates to pixels */
+    uint64_t orig_width  = (uint64_t) width  * UINT32_MAX /
+                           (UINT32_MAX - map->bound_right  - map->bound_left);
+    uint64_t orig_height = (uint64_t) height * UINT32_MAX /
+                           (UINT32_MAX - map->bound_bottom - map->bound_top);
+
+    /* add a (UINT32_MAX - 1) to round up integer division */
+    *left   = (orig_width  * map->bound_left + UINT32_MAX - 1) / UINT32_MAX;
+    *top    = (orig_height * map->bound_top  + UINT32_MAX - 1) / UINT32_MAX;
+    *right  = orig_width  - width  - *left;
+    *bottom = orig_height - height - *top;
+}

libavutil/spherical.h

@@ -63,6 +63,13 @@ enum AVSphericalProjection {
      * to the back.
      */
     AV_SPHERICAL_CUBEMAP,
+
+    /**
+     * Video represents a portion of a sphere mapped on a flat surface
+     * using equirectangular projection. The @ref bounding fields indicate
+     * the position of the current video in a larger surface.
+     */
+    AV_SPHERICAL_EQUIRECTANGULAR_TILE,
 };
 
 /**
@@ -122,6 +129,57 @@ typedef struct AVSphericalMapping {
     /**
      * @}
      */
+
+    /**
+     * @name Bounding rectangle
+     * @anchor bounding
+     * @{
+     * These fields indicate the location of the current tile, and where
+     * it should be mapped relative to the original surface. They are
+     * exported as 0.32 fixed point, and can be converted to classic
+     * pixel values with av_spherical_bounds().
+     *
+     * @code{.unparsed}
+     *      +----------------+----------+
+     *      |                |bound_top |
+     *      |            +--------+     |
+     *      | bound_left |tile    |     |
+     *      +<---------->|        |<--->+bound_right
+     *      |            +--------+     |
+     *      |                |          |
+     *      |    bound_bottom|          |
+     *      +----------------+----------+
+     * @endcode
+     *
+     * If needed, the original video surface dimensions can be derived
+     * by adding the current stream or frame size to the related bounds,
+     * like in the following example:
+     *
+     * @code{c}
+     *     original_width  = tile->width  + bound_left + bound_right;
+     *     original_height = tile->height + bound_top  + bound_bottom;
+     * @endcode
+     *
+     * @note These values are valid only for the tiled equirectangular
+     *       projection type (@ref AV_SPHERICAL_EQUIRECTANGULAR_TILE),
+     *       and should be ignored in all other cases.
+     */
+    size_t bound_left;   ///< Distance from the left edge
+    size_t bound_top;    ///< Distance from the top edge
+    size_t bound_right;  ///< Distance from the right edge
+    size_t bound_bottom; ///< Distance from the bottom edge
+    /**
+     * @}
+     */
+
+    /**
+     * Number of pixels to pad from the edge of each cube face.
+     *
+     * @note This value is valid for only for the cubemap projection type
+     *       (@ref AV_SPHERICAL_CUBEMAP), and should be ignored in all other
+     *       cases.
+     */
+    size_t padding;
 } AVSphericalMapping;
 
 /**
@@ -132,6 +190,22 @@ typedef struct AVSphericalMapping {
  */
 AVSphericalMapping *av_spherical_alloc(size_t *size);
 
+/**
+ * Convert the @ref bounding fields from an AVSphericalVideo
+ * from 0.32 fixed point to pixels.
+ *
+ * @param map    The AVSphericalVideo map to read bound values from.
+ * @param width  Width of the current frame or stream.
+ * @param height Height of the current frame or stream.
+ * @param left   Pixels from the left edge.
+ * @param top    Pixels from the top edge.
+ * @param right  Pixels from the right edge.
+ * @param bottom Pixels from the bottom edge.
+ */
+void av_spherical_tile_bounds(AVSphericalMapping *map,
+                              size_t width, size_t height,
+                              size_t *left, size_t *top,
+                              size_t *right, size_t *bottom);
 /**
  * @}
  * @}

libavutil/version.h

@@ -79,8 +79,8 @@
  */
 
 #define LIBAVUTIL_VERSION_MAJOR  55
-#define LIBAVUTIL_VERSION_MINOR  47
-#define LIBAVUTIL_VERSION_MICRO 101
+#define LIBAVUTIL_VERSION_MINOR  48
+#define LIBAVUTIL_VERSION_MICRO 100
 
 #define LIBAVUTIL_VERSION_INT   AV_VERSION_INT(LIBAVUTIL_VERSION_MAJOR, \
                                                LIBAVUTIL_VERSION_MINOR, \

tests/ref/fate/matroska-spherical-mono

@@ -7,7 +7,7 @@ inverted=0
 [/SIDE_DATA]
 [SIDE_DATA]
 side_data_type=Spherical Mapping
-side_data_size=16
+side_data_size=56
 projection=equirectangular
 yaw=45
 pitch=30

tests/ref/fate/mov-spherical-mono

@@ -7,7 +7,7 @@ inverted=0
 [/SIDE_DATA]
 [SIDE_DATA]
 side_data_type=Spherical Mapping
-side_data_size=16
+side_data_size=56
 projection=equirectangular
 yaw=45
 pitch=30