[FFmpeg-devel] [PATCH 03/11] Implement av_get_codec_tag_string() and use it in ffprobe.

[Michael Niedermayer]

On Sat, May 22, 2010 at 05:58:07PM +0200, Stefano Sabatini wrote:
> ---
[...]
> --- a/libavcodec/avcodec.h
> +++ b/libavcodec/avcodec.h
> @@ -3088,6 +3088,15 @@ attribute_deprecated enum PixelFormat avcodec_get_pix_fmt(const char* name);
>   */
>  unsigned int avcodec_pix_fmt_to_codec_tag(enum PixelFormat pix_fmt);
>  
> +/**
> + * Returns a string representing a codec tag, NULL if the codec_tag is
> + * unknown.
> + *

> + * @param buf buffer with size buf_size where the function puts the
> + * codec tag string

doesnt match code


> + */
> +const char *av_get_codec_tag_string(char *buf, size_t buf_size, unsigned int codec_tag);
> +
>  #define FF_LOSS_RESOLUTION  0x0001 /**< loss due to resolution change */
>  #define FF_LOSS_DEPTH       0x0002 /**< loss due to color depth change */
>  #define FF_LOSS_COLORSPACE  0x0004 /**< loss due to color space conversion */
> diff --git a/libavcodec/utils.c b/libavcodec/utils.c
> index 56d4dbd..8d8826a 100644
> --- a/libavcodec/utils.c
> +++ b/libavcodec/utils.c
> @@ -798,6 +798,22 @@ static int get_bit_rate(AVCodecContext *ctx)
>      return bit_rate;
>  }
>  
> +const char *av_get_codec_tag_string(char *buf, size_t buf_size, unsigned int codec_tag)

const?


> +{
> +    int i, fourcc[4];
> +    fourcc[0] = codec_tag     & 0xff;
> +    fourcc[1] = codec_tag>>8  & 0xff;
> +    fourcc[2] = codec_tag>>16 & 0xff;
> +    fourcc[3] = codec_tag>>24 & 0xff;
> +
> +    buf[0] = 0;
> +    for (i = 0; i < 4; i++) {
> +        if (isprint(fourcc[i])) av_strlcatf(buf, buf_size,  "%c" , fourcc[i]);
> +        else                    av_strlcatf(buf, buf_size, "[%d]", fourcc[i]);

snprintf()

codec_tag&0xFF
codec_tag>>=8;

[...]

-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

Freedom in capitalist society always remains about the same as it was in
ancient Greek republics: Freedom for slave owners. -- Vladimir Lenin
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