avcodec/avutil: move dynamic HDR10+ metadata parsing to libavutil

Signed-off-by: Raphaël Zumer <rzumer@tebako.net>
Signed-off-by: James Almer <jamrial@gmail.com>

2 files changed, 203 insertions, 0 deletions

diff --git a/libavutil/hdr_dynamic_metadata.c b/libavutil/hdr_dynamic_metadata.c
index 0fa1ee82de..bcf638f5c3 100644
--- a/libavutil/hdr_dynamic_metadata.c
+++ b/libavutil/hdr_dynamic_metadata.c
@@ -20,6 +20,18 @@
 
 #include "hdr_dynamic_metadata.h"
 #include "mem.h"
+#include "libavcodec/defs.h"
+#include "libavcodec/get_bits.h"
+
+#define T35_PAYLOAD_MAX_SIZE 907
+
+static const int64_t luminance_den = 1;
+static const int32_t peak_luminance_den = 15;
+static const int64_t rgb_den = 100000;
+static const int32_t fraction_pixel_den = 1000;
+static const int32_t knee_point_den = 4095;
+static const int32_t bezier_anchor_den = 1023;
+static const int32_t saturation_weight_den = 8;
 
 AVDynamicHDRPlus *av_dynamic_hdr_plus_alloc(size_t *size)
 {
@@ -45,3 +57,181 @@ AVDynamicHDRPlus *av_dynamic_hdr_plus_create_side_data(AVFrame *frame)
 
     return (AVDynamicHDRPlus *)side_data->data;
 }
+
+int av_dynamic_hdr_plus_from_t35(AVDynamicHDRPlus *s, const uint8_t *data,
+                                 size_t size)
+{
+    uint8_t padded_buf[T35_PAYLOAD_MAX_SIZE + AV_INPUT_BUFFER_PADDING_SIZE];
+    GetBitContext gbc, *gb = &gbc;
+    int ret;
+
+    if (!s)
+        return AVERROR(ENOMEM);
+
+    if (size > T35_PAYLOAD_MAX_SIZE)
+        return AVERROR(EINVAL);
+
+    memcpy(padded_buf, data, size);
+    // Zero-initialize the buffer padding to avoid overreads into uninitialized data.
+    memset(padded_buf + size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
+
+    ret = init_get_bits8(gb, padded_buf, size);
+    if (ret < 0)
+        return ret;
+
+    if (get_bits_left(gb) < 10)
+        return AVERROR_INVALIDDATA;
+
+    s->application_version = get_bits(gb, 8);
+    s->num_windows = get_bits(gb, 2);
+
+    if (s->num_windows < 1 || s->num_windows > 3) {
+        return AVERROR_INVALIDDATA;
+    }
+
+    if (get_bits_left(gb) < ((19 * 8 + 1) * (s->num_windows - 1)))
+        return AVERROR_INVALIDDATA;
+
+    for (int w = 1; w < s->num_windows; w++) {
+        // The corners are set to absolute coordinates here. They should be
+        // converted to the relative coordinates (in [0, 1]) in the decoder.
+        AVHDRPlusColorTransformParams *params = &s->params[w];
+        params->window_upper_left_corner_x =
+            (AVRational){get_bits(gb, 16), 1};
+        params->window_upper_left_corner_y =
+            (AVRational){get_bits(gb, 16), 1};
+        params->window_lower_right_corner_x =
+            (AVRational){get_bits(gb, 16), 1};
+        params->window_lower_right_corner_y =
+            (AVRational){get_bits(gb, 16), 1};
+
+        params->center_of_ellipse_x = get_bits(gb, 16);
+        params->center_of_ellipse_y = get_bits(gb, 16);
+        params->rotation_angle = get_bits(gb, 8);
+        params->semimajor_axis_internal_ellipse = get_bits(gb, 16);
+        params->semimajor_axis_external_ellipse = get_bits(gb, 16);
+        params->semiminor_axis_external_ellipse = get_bits(gb, 16);
+        params->overlap_process_option = get_bits1(gb);
+    }
+
+    if (get_bits_left(gb) < 28)
+        return AVERROR_INVALIDDATA;
+
+    s->targeted_system_display_maximum_luminance =
+        (AVRational){get_bits_long(gb, 27), luminance_den};
+    s->targeted_system_display_actual_peak_luminance_flag = get_bits1(gb);
+
+    if (s->targeted_system_display_actual_peak_luminance_flag) {
+        int rows, cols;
+        if (get_bits_left(gb) < 10)
+            return AVERROR_INVALIDDATA;
+        rows = get_bits(gb, 5);
+        cols = get_bits(gb, 5);
+        if (((rows < 2) || (rows > 25)) || ((cols < 2) || (cols > 25))) {
+            return AVERROR_INVALIDDATA;
+        }
+        s->num_rows_targeted_system_display_actual_peak_luminance = rows;
+        s->num_cols_targeted_system_display_actual_peak_luminance = cols;
+
+        if (get_bits_left(gb) < (rows * cols * 4))
+            return AVERROR_INVALIDDATA;
+
+        for (int i = 0; i < rows; i++) {
+            for (int j = 0; j < cols; j++) {
+                s->targeted_system_display_actual_peak_luminance[i][j] =
+                    (AVRational){get_bits(gb, 4), peak_luminance_den};
+            }
+        }
+    }
+    for (int w = 0; w < s->num_windows; w++) {
+        AVHDRPlusColorTransformParams *params = &s->params[w];
+        if (get_bits_left(gb) < (3 * 17 + 17 + 4))
+            return AVERROR_INVALIDDATA;
+
+        for (int i = 0; i < 3; i++) {
+            params->maxscl[i] =
+                (AVRational){get_bits(gb, 17), rgb_den};
+        }
+        params->average_maxrgb =
+            (AVRational){get_bits(gb, 17), rgb_den};
+        params->num_distribution_maxrgb_percentiles = get_bits(gb, 4);
+
+        if (get_bits_left(gb) <
+            (params->num_distribution_maxrgb_percentiles * 24))
+            return AVERROR_INVALIDDATA;
+
+        for (int i = 0; i < params->num_distribution_maxrgb_percentiles; i++) {
+            params->distribution_maxrgb[i].percentage = get_bits(gb, 7);
+            params->distribution_maxrgb[i].percentile =
+                (AVRational){get_bits(gb, 17), rgb_den};
+        }
+
+        if (get_bits_left(gb) < 10)
+            return AVERROR_INVALIDDATA;
+
+        params->fraction_bright_pixels = (AVRational){get_bits(gb, 10), fraction_pixel_den};
+    }
+    if (get_bits_left(gb) < 1)
+        return AVERROR_INVALIDDATA;
+    s->mastering_display_actual_peak_luminance_flag = get_bits1(gb);
+    if (s->mastering_display_actual_peak_luminance_flag) {
+        int rows, cols;
+        if (get_bits_left(gb) < 10)
+            return AVERROR_INVALIDDATA;
+        rows = get_bits(gb, 5);
+        cols = get_bits(gb, 5);
+        if (((rows < 2) || (rows > 25)) || ((cols < 2) || (cols > 25))) {
+            return AVERROR_INVALIDDATA;
+        }
+        s->num_rows_mastering_display_actual_peak_luminance = rows;
+        s->num_cols_mastering_display_actual_peak_luminance = cols;
+
+        if (get_bits_left(gb) < (rows * cols * 4))
+            return AVERROR_INVALIDDATA;
+
+        for (int i = 0; i < rows; i++) {
+            for (int j = 0; j < cols; j++) {
+                s->mastering_display_actual_peak_luminance[i][j] =
+                    (AVRational){get_bits(gb, 4), peak_luminance_den};
+            }
+        }
+    }
+
+    for (int w = 0; w < s->num_windows; w++) {
+        AVHDRPlusColorTransformParams *params = &s->params[w];
+        if (get_bits_left(gb) < 1)
+            return AVERROR_INVALIDDATA;
+
+        params->tone_mapping_flag = get_bits1(gb);
+        if (params->tone_mapping_flag) {
+            if (get_bits_left(gb) < 28)
+                return AVERROR_INVALIDDATA;
+
+            params->knee_point_x =
+                (AVRational){get_bits(gb, 12), knee_point_den};
+            params->knee_point_y =
+                (AVRational){get_bits(gb, 12), knee_point_den};
+            params->num_bezier_curve_anchors = get_bits(gb, 4);
+
+            if (get_bits_left(gb) < (params->num_bezier_curve_anchors * 10))
+                return AVERROR_INVALIDDATA;
+
+            for (int i = 0; i < params->num_bezier_curve_anchors; i++) {
+                params->bezier_curve_anchors[i] =
+                    (AVRational){get_bits(gb, 10), bezier_anchor_den};
+            }
+        }
+
+        if (get_bits_left(gb) < 1)
+            return AVERROR_INVALIDDATA;
+        params->color_saturation_mapping_flag = get_bits1(gb);
+        if (params->color_saturation_mapping_flag) {
+            if (get_bits_left(gb) < 6)
+                return AVERROR_INVALIDDATA;
+            params->color_saturation_weight =
+                (AVRational){get_bits(gb, 6), saturation_weight_den};
+        }
+    }
+
+    return 0;
+}
diff --git a/libavutil/hdr_dynamic_metadata.h b/libavutil/hdr_dynamic_metadata.h
index 2d72de56ae..a0e5cb1db6 100644
--- a/libavutil/hdr_dynamic_metadata.h
+++ b/libavutil/hdr_dynamic_metadata.h
@@ -340,4 +340,17 @@ AVDynamicHDRPlus *av_dynamic_hdr_plus_alloc(size_t *size);
  */
 AVDynamicHDRPlus *av_dynamic_hdr_plus_create_side_data(AVFrame *frame);
 
+/**
+ * Parse the user data registered ITU-T T.35 to AVbuffer (AVDynamicHDRPlus).
+ * The T.35 buffer must begin with the application mode, skipping the
+ * country code, terminal provider codes, and application identifier.
+ * @param s A pointer containing the decoded AVDynamicHDRPlus structure.
+ * @param data The byte array containing the raw ITU-T T.35 data.
+ * @param size Size of the data array in bytes.
+ *
+ * @return >= 0 on success. Otherwise, returns the appropriate AVERROR.
+ */
+int av_dynamic_hdr_plus_from_t35(AVDynamicHDRPlus *s, const uint8_t *data,
+                                 size_t size);
+
 #endif /* AVUTIL_HDR_DYNAMIC_METADATA_H */