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

[Andreas Rheinhardt <andreas.rheinhardt@outlook.com>]

James Almer:
> 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()

Why do you want to make probing less strict?

> +    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);

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