[FFmpeg-devel] [PATCHv2 3/3] avformat/avio: remove 4k limit from avio_printf

[Paul B Mahol]

LGTM

On Sat, Aug 10, 2019 at 10:56 PM Marton Balint <cus at passwd.hu> wrote:

> We do this by switching to AVBPrint.
>
> v2: Also set IO context error flag in case of ENOMEM.
>
> Signed-off-by: Marton Balint <cus at passwd.hu>
> ---
>  doc/APIchanges        |  3 +++
>  libavformat/avio.h    |  5 ++++-
>  libavformat/aviobuf.c | 16 +++++++++++-----
>  libavformat/version.h |  2 +-
>  4 files changed, 19 insertions(+), 7 deletions(-)
>
> diff --git a/doc/APIchanges b/doc/APIchanges
> index 0b19fb067d..fe36c34b90 100644
> --- a/doc/APIchanges
> +++ b/doc/APIchanges
> @@ -15,6 +15,9 @@ libavutil:     2017-10-21
>
>  API changes, most recent first:
>
> +2019-08-xx - xxxxxxxxxx - lavf 58.31.101 - avio.h
> +  4K limit removed from avio_printf.
> +
>  2019-08-xx - xxxxxxxxxx - lavf 58.31.100 - avio.h
>    Add avio_print_n_strings and avio_print.
>
> diff --git a/libavformat/avio.h b/libavformat/avio.h
> index 0c622f44bd..f3a35004d2 100644
> --- a/libavformat/avio.h
> +++ b/libavformat/avio.h
> @@ -571,7 +571,10 @@ int64_t avio_size(AVIOContext *s);
>   */
>  int avio_feof(AVIOContext *s);
>
> -/** @warning Writes up to 4 KiB per call */
> +/**
> + * Writes a formatted string to the context.
> + * @return number of bytes written, < 0 on error.
> + */
>  int avio_printf(AVIOContext *s, const char *fmt, ...) av_printf_format(2,
> 3);
>
>  /**
> diff --git a/libavformat/aviobuf.c b/libavformat/aviobuf.c
> index 4a37a13d7a..2a0f033c45 100644
> --- a/libavformat/aviobuf.c
> +++ b/libavformat/aviobuf.c
> @@ -1215,14 +1215,20 @@ int avio_closep(AVIOContext **s)
>  int avio_printf(AVIOContext *s, const char *fmt, ...)
>  {
>      va_list ap;
> -    char buf[4096]; /* update doc entry in avio.h if changed */
> -    int ret;
> +    AVBPrint bp;
>
> +    av_bprint_init(&bp, 0, INT_MAX);
>      va_start(ap, fmt);
> -    ret = vsnprintf(buf, sizeof(buf), fmt, ap);
> +    av_vbprintf(&bp, fmt, ap);
>      va_end(ap);
> -    avio_write(s, buf, strlen(buf));
> -    return ret;
> +    if (!av_bprint_is_complete(&bp)) {
> +        av_bprint_finalize(&bp, NULL);
> +        s->error = AVERROR(ENOMEM);
> +        return AVERROR(ENOMEM);
> +    }
> +    avio_write(s, bp.str, bp.len);
> +    av_bprint_finalize(&bp, NULL);
> +    return bp.len;
>  }
>
>  void avio_print_n_strings(AVIOContext *s, int nb_strings, ...)
> diff --git a/libavformat/version.h b/libavformat/version.h
> index feceaedc08..9814db8633 100644
> --- a/libavformat/version.h
> +++ b/libavformat/version.h
> @@ -33,7 +33,7 @@
>  // Also please add any ticket numbers that you believe might be affected
> here
>  #define LIBAVFORMAT_VERSION_MAJOR  58
>  #define LIBAVFORMAT_VERSION_MINOR  31
> -#define LIBAVFORMAT_VERSION_MICRO 100
> +#define LIBAVFORMAT_VERSION_MICRO 101
>
>  #define LIBAVFORMAT_VERSION_INT AV_VERSION_INT(LIBAVFORMAT_VERSION_MAJOR,
> \
>                                                 LIBAVFORMAT_VERSION_MINOR,
> \
> --
> 2.16.4
>
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