Re: [FFmpeg-devel] [PATCH] avformat/framecrcenc: List types and checksums for for side data

[James Almer <jamrial@gmail.com>]

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On 5/18/2025 9:25 AM, Michael Niedermayer wrote:
> This allows detecting changes and regressions in side data related code, same as what
> framecrc does for before already for packet data itself.
> 
> Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
> ---
>   libavformat/framecrcenc.c                   |  116 +-
>   tests/ref/fate/autorotate                   |    2 +-
>   tests/ref/fate/cover-art-mp3-id3v2-remux    |    2 +-
>   tests/ref/fate/ffmpeg-bsf-input             |   10 +-
>   tests/ref/fate/ffmpeg-spec-disposition      |    2 +-
>   tests/ref/fate/force_key_frames-source      |  784 ++++++------
>   tests/ref/fate/force_key_frames-source-drop |   34 +-
>   tests/ref/fate/force_key_frames-source-dup  | 1224 +++++++++----------
>   tests/ref/fate/gapless-mp3                  |    6 +-
>   tests/ref/fate/h264_redundant_pps-side_data |    2 +-
>   tests/ref/fate/id3v2-priv-remux             |    2 +-
>   tests/ref/fate/matroska-hdr10-plus-remux    |    2 +-
>   tests/ref/fate/matroska-ogg-opus-remux      |    2 +-
>   tests/ref/fate/matroska-opus-remux          |    2 +-
>   tests/ref/fate/matroska-vp8-alpha-remux     |   14 +-
>   tests/ref/fate/mov-cover-image              |    2 +-
>   tests/ref/fate/segment-mp4-to-ts            |  250 ++--
>   tests/ref/fate/shortest                     |  100 +-
>   tests/ref/fate/webm-hdr10-plus-remux        |    2 +-
>   tests/ref/fate/webm-webvtt-remux            |   24 +-
>   20 files changed, 1346 insertions(+), 1236 deletions(-)
> 
> diff --git a/libavformat/framecrcenc.c b/libavformat/framecrcenc.c
> index 2ba20f3aab4..96c2a82eb2a 100644
> --- a/libavformat/framecrcenc.c
> +++ b/libavformat/framecrcenc.c
> @@ -21,8 +21,11 @@
>   
>   #include <inttypes.h>
>   
> +#include "config.h"
>   #include "libavutil/adler32.h"
>   #include "libavutil/avstring.h"
> +#include "libavutil/intreadwrite.h"
> +#include "libavutil/hdr_dynamic_metadata.h"
>   
>   #include "libavcodec/codec_id.h"
>   #include "libavcodec/codec_par.h"
> @@ -48,6 +51,20 @@ static int framecrc_write_header(struct AVFormatContext *s)
>       return ff_framehash_write_header(s);
>   }
>   
> +static av_unused void inline bswap(char *buf, int offset, int size)
> +{
> +    if (size == 8) {
> +        uint64_t val = AV_RN64(buf + offset);
> +        AV_WN64(buf + offset, av_bswap64(val));
> +    } else if (size == 4) {
> +        uint32_t val = AV_RN32(buf + offset);
> +        AV_WN32(buf + offset, av_bswap32(val));
> +    } else if (size == 2) {
> +        uint16_t val = AV_RN16(buf + offset);
> +        AV_WN16(buf + offset, av_bswap16(val));
> +    }
> +}
> +
>   static int framecrc_write_packet(struct AVFormatContext *s, AVPacket *pkt)
>   {
>       uint32_t crc = av_adler32_update(0, pkt->data, pkt->size);
> @@ -58,11 +75,104 @@ static int framecrc_write_packet(struct AVFormatContext *s, AVPacket *pkt)
>       if (pkt->flags != AV_PKT_FLAG_KEY)
>           av_strlcatf(buf, sizeof(buf), ", F=0x%0X", pkt->flags);
>       if (pkt->side_data_elems) {
> +        int i;
>           av_strlcatf(buf, sizeof(buf), ", S=%d", pkt->side_data_elems);
>   
> -        for (int i = 0; i < pkt->side_data_elems; i++) {
> -            av_strlcatf(buf, sizeof(buf), ", %8"SIZE_SPECIFIER,
> -                        pkt->side_data[i].size);
> +        for (i=0; i<pkt->side_data_elems; i++) {
> +            const AVPacketSideData *const sd = &pkt->side_data[i];
> +            const uint8_t *data = sd->data;
> +            uint32_t side_data_crc = 0;
> +
> +            switch (sd->type) {

Wont this potentially introduce extra work for when we add new types?


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