diff mbox

[FFmpeg-devel,2/3] avformat/mxfdec: support subsecond precision of decoded timestamps

Message ID 20181223001256.31893-2-cus@passwd.hu
State Accepted
Commit 02935c2c93e8e1691c1d903ef96b00b3facb454a
Headers show

Commit Message

Marton Balint Dec. 23, 2018, 12:12 a.m. UTC
Signed-off-by: Marton Balint <cus@passwd.hu>
---
 libavformat/mxfdec.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

Comments

Tomas Härdin Dec. 25, 2018, 9:16 a.m. UTC | #1
sön 2018-12-23 klockan 01:12 +0100 skrev Marton Balint:
> > Signed-off-by: Marton Balint <cus@passwd.hu>
> ---
>  libavformat/mxfdec.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/libavformat/mxfdec.c b/libavformat/mxfdec.c
> index d78f8ad2e4..0553adcb06 100644
> --- a/libavformat/mxfdec.c
> +++ b/libavformat/mxfdec.c
> @@ -2556,12 +2556,14 @@ fail_and_free:
>  static int64_t mxf_timestamp_to_int64(uint64_t timestamp)
>  {
>      struct tm time = { 0 };
> +    int msecs;
>      time.tm_year = (timestamp >> 48) - 1900;
>      time.tm_mon  = (timestamp >> 40 & 0xFF) - 1;
>      time.tm_mday = (timestamp >> 32 & 0xFF);
>      time.tm_hour = (timestamp >> 24 & 0xFF);
>      time.tm_min  = (timestamp >> 16 & 0xFF);
>      time.tm_sec  = (timestamp >> 8  & 0xFF);
> +    msecs        = (timestamp & 0xFF) * 4;
>  
>      /* Clip values for legacy reasons. Maybe we should return error instead? */
>      time.tm_mon  = av_clip(time.tm_mon,  0, 11);
> @@ -2569,8 +2571,9 @@ static int64_t mxf_timestamp_to_int64(uint64_t timestamp)
>      time.tm_hour = av_clip(time.tm_hour, 0, 23);
>      time.tm_min  = av_clip(time.tm_min,  0, 59);
>      time.tm_sec  = av_clip(time.tm_sec,  0, 59);
> +    msecs        = av_clip(msecs, 0, 999);
>  
> -    return (int64_t)av_timegm(&time) * 1000000;
> +    return (int64_t)av_timegm(&time) * 1000000 + msecs * 1000;

Looks OK

I kinda wonder how this and the muxer code could have ignored the
milliseconds. Did the old creation time metadata use seconds only?

/Tomas
Marton Balint Dec. 25, 2018, 7:31 p.m. UTC | #2
On Tue, 25 Dec 2018, Tomas Härdin wrote:

> sön 2018-12-23 klockan 01:12 +0100 skrev Marton Balint:
>> > Signed-off-by: Marton Balint <cus@passwd.hu>
>> ---
>>  libavformat/mxfdec.c | 5 ++++-
>>  1 file changed, 4 insertions(+), 1 deletion(-)
>> 
>> diff --git a/libavformat/mxfdec.c b/libavformat/mxfdec.c
>> index d78f8ad2e4..0553adcb06 100644
>> --- a/libavformat/mxfdec.c
>> +++ b/libavformat/mxfdec.c
>> @@ -2556,12 +2556,14 @@ fail_and_free:
>>  static int64_t mxf_timestamp_to_int64(uint64_t timestamp)
>>  {
>>      struct tm time = { 0 };
>> +    int msecs;
>>      time.tm_year = (timestamp >> 48) - 1900;
>>      time.tm_mon  = (timestamp >> 40 & 0xFF) - 1;
>>      time.tm_mday = (timestamp >> 32 & 0xFF);
>>      time.tm_hour = (timestamp >> 24 & 0xFF);
>>      time.tm_min  = (timestamp >> 16 & 0xFF);
>>      time.tm_sec  = (timestamp >> 8  & 0xFF);
>> +    msecs        = (timestamp & 0xFF) * 4;
>>  
>>      /* Clip values for legacy reasons. Maybe we should return error instead? */
>>      time.tm_mon  = av_clip(time.tm_mon,  0, 11);
>> @@ -2569,8 +2571,9 @@ static int64_t mxf_timestamp_to_int64(uint64_t timestamp)
>>      time.tm_hour = av_clip(time.tm_hour, 0, 23);
>>      time.tm_min  = av_clip(time.tm_min,  0, 59);
>>      time.tm_sec  = av_clip(time.tm_sec,  0, 59);
>> +    msecs        = av_clip(msecs, 0, 999);
>>  
>> -    return (int64_t)av_timegm(&time) * 1000000;
>> +    return (int64_t)av_timegm(&time) * 1000000 + msecs * 1000;
>
> Looks OK

Thanks, pushed this and the other patch.

>
> I kinda wonder how this and the muxer code could have ignored the
> milliseconds. Did the old creation time metadata use seconds only?

Yes, it used to be in this format: "%Y-%m-%d %H:%M:%S".

Regards,
Marton
diff mbox

Patch

diff --git a/libavformat/mxfdec.c b/libavformat/mxfdec.c
index d78f8ad2e4..0553adcb06 100644
--- a/libavformat/mxfdec.c
+++ b/libavformat/mxfdec.c
@@ -2556,12 +2556,14 @@  fail_and_free:
 static int64_t mxf_timestamp_to_int64(uint64_t timestamp)
 {
     struct tm time = { 0 };
+    int msecs;
     time.tm_year = (timestamp >> 48) - 1900;
     time.tm_mon  = (timestamp >> 40 & 0xFF) - 1;
     time.tm_mday = (timestamp >> 32 & 0xFF);
     time.tm_hour = (timestamp >> 24 & 0xFF);
     time.tm_min  = (timestamp >> 16 & 0xFF);
     time.tm_sec  = (timestamp >> 8  & 0xFF);
+    msecs        = (timestamp & 0xFF) * 4;
 
     /* Clip values for legacy reasons. Maybe we should return error instead? */
     time.tm_mon  = av_clip(time.tm_mon,  0, 11);
@@ -2569,8 +2571,9 @@  static int64_t mxf_timestamp_to_int64(uint64_t timestamp)
     time.tm_hour = av_clip(time.tm_hour, 0, 23);
     time.tm_min  = av_clip(time.tm_min,  0, 59);
     time.tm_sec  = av_clip(time.tm_sec,  0, 59);
+    msecs        = av_clip(msecs, 0, 999);
 
-    return (int64_t)av_timegm(&time) * 1000000;
+    return (int64_t)av_timegm(&time) * 1000000 + msecs * 1000;
 }
 
 #define SET_STR_METADATA(pb, name, str) do { \