[FFmpeg-devel] [PATCH v3] avformat/apvdec: export color information

[James Almer <jamrial@gmail.com>]

apv_read_header() reads enough information that the generic demux code doesn't
attempt to read a frame to fill missing fields in codecpar, so make sure it's
set here.

Signed-off-by: James Almer <jamrial@gmail.com>
---
 libavformat/apvdec.c | 40 ++++++++++++++++++++++++++++++++++++++--
 1 file changed, 38 insertions(+), 2 deletions(-)

diff --git a/libavformat/apvdec.c b/libavformat/apvdec.c
index e1ac34b003..9f8af35567 100644
--- a/libavformat/apvdec.c
+++ b/libavformat/apvdec.c
@@ -39,6 +39,11 @@ typedef struct APVHeaderInfo {
     uint8_t  chroma_format_idc;
     uint8_t  bit_depth_minus8;
 
+    uint8_t  color_primaries;
+    uint8_t  transfer_characteristics;
+    uint8_t  matrix_coefficients;
+    uint8_t  full_range_flag;
+
     enum AVPixelFormat pixel_format;
 } APVHeaderInfo;
 
@@ -111,6 +116,31 @@ static int apv_extract_header_info(APVHeaderInfo *info,
     if (zero != 0)
         return AVERROR_INVALIDDATA;
 
+    // Return if this function was called by apv_probe()
+    if (bytestream2_get_bytes_left(gbc) == 0)
+        return 1;
+
+    zero = bytestream2_get_byte(gbc);
+    if (zero != 0)
+        return AVERROR_INVALIDDATA;
+
+    // color_description_present_flag
+    if (bytestream2_peek_byte(gbc) >> 7) {
+        unsigned color_description;
+
+        // We can read 32 bits as tile info is guaranteed to be present after this.
+        color_description              = bytestream2_get_be32(gbc);
+        info->color_primaries          = (color_description >> 23) & 0xff;
+        info->transfer_characteristics = (color_description >> 15) & 0xff;
+        info->matrix_coefficients      = (color_description >>  7) & 0xff;
+        info->full_range_flag          = (color_description >>  6) & 1;
+    } else {
+        info->color_primaries          = AVCOL_PRI_UNSPECIFIED;
+        info->transfer_characteristics = AVCOL_TRC_UNSPECIFIED;
+        info->matrix_coefficients      = AVCOL_SPC_UNSPECIFIED;
+        info->full_range_flag          = 0;
+    }
+
     return 1;
 }
 
@@ -126,7 +156,7 @@ static int apv_probe(const AVProbeData *p)
         return 0;
     }
 
-    bytestream2_init(&gbc, p->buf, p->buf_size);
+    bytestream2_init(&gbc, p->buf, 28);
 
     au_size = bytestream2_get_be32(&gbc);
     if (au_size < 24) {
@@ -157,7 +187,7 @@ static int apv_read_header(AVFormatContext *s)
     AVStream *st;
     GetByteContext gbc;
     APVHeaderInfo header;
-    uint8_t buffer[28];
+    uint8_t buffer[33];
     uint32_t au_size, signature, pbu_size;
     int err, size;
 
@@ -201,6 +231,12 @@ static int apv_read_header(AVFormatContext *s)
     st->codecpar->level      = header.level_idc;
     st->codecpar->width      = header.frame_width;
     st->codecpar->height     = header.frame_height;
+    st->codecpar->chroma_location = AVCHROMA_LOC_TOPLEFT;
+    st->codecpar->color_primaries = header.color_primaries;
+    st->codecpar->color_trc       = header.transfer_characteristics;
+    st->codecpar->color_space     = header.matrix_coefficients;
+    st->codecpar->color_range     = header.full_range_flag ? AVCOL_RANGE_JPEG
+                                                           : AVCOL_RANGE_MPEG;
 
     st->avg_frame_rate = (AVRational){ 30, 1 };
     avpriv_set_pts_info(st, 64, 1, 30);
-- 
2.49.0

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