Re: [FFmpeg-devel] [PATCH v2 2/3] avcodec/utils: use new ff_timecode_set_smpte function

[Timo Rothenpieler <timo@rothenpieler.org>]

On 28.02.2025 23:46, Timo Rothenpieler wrote:
> ---
>   libavcodec/Makefile            |  2 ++
>   libavcodec/timecode_internal.c | 19 +++++++++++++++++++
>   libavcodec/utils.c             | 29 +++--------------------------
>   libavutil/Makefile             |  3 +++
>   4 files changed, 27 insertions(+), 26 deletions(-)
>   create mode 100644 libavcodec/timecode_internal.c
> 
> diff --git a/libavcodec/Makefile b/libavcodec/Makefile
> index 499f826635..e3ccbf1838 100644
> --- a/libavcodec/Makefile
> +++ b/libavcodec/Makefile
> @@ -64,6 +64,8 @@ OBJS = ac3_parser.o                                                     \
>          vorbis_parser.o                                                  \
>          xiph.o                                                           \
>   
> +SHLIBOBJS = timecode_internal.o                                         \
> +
>   # subsystems
>   include $(SRC_PATH)/libavcodec/aac/Makefile
>   include $(SRC_PATH)/libavcodec/hevc/Makefile
> diff --git a/libavcodec/timecode_internal.c b/libavcodec/timecode_internal.c
> new file mode 100644
> index 0000000000..8682bb1b2e
> --- /dev/null
> +++ b/libavcodec/timecode_internal.c
> @@ -0,0 +1,19 @@
> +/*
> + * This file is part of FFmpeg.
> + *
> + * FFmpeg is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU Lesser General Public
> + * License as published by the Free Software Foundation; either
> + * version 2.1 of the License, or (at your option) any later version.
> + *
> + * FFmpeg is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
> + * Lesser General Public License for more details.
> + *
> + * You should have received a copy of the GNU Lesser General Public
> + * License along with FFmpeg; if not, write to the Free Software
> + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
> + */
> +
> +#include "libavutil/timecode_internal.c"
> diff --git a/libavcodec/utils.c b/libavcodec/utils.c
> index dd846b4ae9..0aa5a6f55e 100644
> --- a/libavcodec/utils.c
> +++ b/libavcodec/utils.c
> @@ -33,6 +33,7 @@
>   #include "libavutil/pixdesc.h"
>   #include "libavutil/imgutils.h"
>   #include "libavutil/pixfmt.h"
> +#include "libavutil/timecode_internal.h"
>   #include "avcodec.h"
>   #include "codec.h"
>   #include "codec_desc.h"
> @@ -968,15 +969,6 @@ AVCPBProperties *av_cpb_properties_alloc(size_t *size)
>       return props;
>   }
>   
> -static unsigned bcd2uint(uint8_t bcd)
> -{
> -    unsigned low  = bcd & 0xf;
> -    unsigned high = bcd >> 4;
> -    if (low > 9 || high > 9)
> -        return 0;
> -    return low + 10*high;
> -}
> -
>   int ff_alloc_timecode_sei(const AVFrame *frame, AVRational rate, size_t prefix_len,
>                        void **data, size_t *sei_size)
>   {
> @@ -1006,23 +998,8 @@ int ff_alloc_timecode_sei(const AVFrame *frame, AVRational rate, size_t prefix_l
>       put_bits(&pb, 2, m); // num_clock_ts
>   
>       for (int j = 1; j <= m; j++) {
> -        uint32_t tcsmpte = tc[j];
> -        unsigned hh   = bcd2uint(tcsmpte     & 0x3f);    // 6-bit hours
> -        unsigned mm   = bcd2uint(tcsmpte>>8  & 0x7f);    // 7-bit minutes
> -        unsigned ss   = bcd2uint(tcsmpte>>16 & 0x7f);    // 7-bit seconds
> -        unsigned ff   = bcd2uint(tcsmpte>>24 & 0x3f);    // 6-bit frames
> -        unsigned drop = tcsmpte & 1<<30 && !0;  // 1-bit drop if not arbitrary bit
> -
> -        /* Calculate frame number of HEVC by SMPTE ST 12-1:2014 Sec 12.2 if rate > 30FPS */
> -        if (av_cmp_q(rate, (AVRational) {30, 1}) == 1) {
> -            unsigned pc;
> -            ff *= 2;
> -            if (av_cmp_q(rate, (AVRational) {50, 1}) == 0)
> -                pc = !!(tcsmpte & 1 << 7);
> -            else
> -                pc = !!(tcsmpte & 1 << 23);
> -            ff = (ff + pc) & 0x7f;
> -        }
> +        unsigned hh, mm, ss, ff, drop;
> +        ff_timecode_set_smpte(&drop, &hh, &mm, &ss, &ff, rate, tc[j], 0, 0);
>   
>           put_bits(&pb, 1, 1); // clock_timestamp_flag
>           put_bits(&pb, 1, 1); // units_field_based_flag
> diff --git a/libavutil/Makefile b/libavutil/Makefile
> index b2b3b9c156..ad534a8acc 100644
> --- a/libavutil/Makefile
> +++ b/libavutil/Makefile
> @@ -180,6 +180,7 @@ OBJS = adler32.o                                                        \
>          threadmessage.o                                                  \
>          time.o                                                           \
>          timecode.o                                                       \
> +       timecode_internal.o                                              \

This line belongs into the first patch, fixed locally.

>          timestamp.o                                                      \
>          tree.o                                                           \
>          twofish.o                                                        \
> @@ -196,6 +197,8 @@ OBJS = adler32.o                                                        \
>          video_enc_params.o                                               \
>          video_hint.o                                                     \
>   
> +STLIBOBJS = timecode_internal.o                                         \
> +
>   
>   OBJS-$(CONFIG_CUDA)                     += hwcontext_cuda.o
>   OBJS-$(CONFIG_D3D11VA)                  += hwcontext_d3d11va.o

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