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• vulkan : take refs of frames using the regular buffer ref path

  1er mars, par Lynne

  vulkan : take refs of frames using the regular buffer ref path
  This simplifies the code, reduces allocations, and critically, does
  
  not store references of frames, along with references to hw_frames_ctx.
  
  The issue was that storing refs to frames while transferring stored
  
  refs to hw_frames_ctx of frames, and so created a circular dependency,
  
  which caused the Vulkan device to never be terminated.
  This only stores what it strictly needs as a dependency, and enables
  
  the frames context to be freed, even while doing asynchronous transfers.
  

  • [DH] libavutil/vulkan.c

• Audio alternative to FFmpeg - Core Audio IOS

  9 juin 2021, par cs guy

  I have been using FFmpeg Android for a music app I'm working on. I built a custom audio engine from stratch with C++ and FFmpeg and it works amazing and it fulfilled all my needs. However, Due to FFmpeg being Lgpl lisence, it seems to me after some researching it is not possible to use a lgpl lisence due to app stores policy. Im not a lawyer or have the money to hire a lawyer for a commercial advise. So I am thinking to replace ffmpeg with another audio decoder, processor library. I am planning to feed the custom decoded data to audio devices through Apples core audio library.

  


  Here are my needs :

  


  

  • Need to decode ogg files

  


  • Need to encode pcm data as aac file

  


  • Need to add post process FX to decoded data such as low pass filter etc

  


  


  So what I am asking for is an answer to one of the following :

  


  

  • Could FFmpeg really not be used in app store due to lgpl static linking issues ? (I looked at the most famous apps that use FFmpeg on Android, all of them does not use FFmpeg on IOS)

  


  • If I were to use another library for FFmpeg what is the best alternative to work with ? Did anyone actually had experienced the same situation that I am in ?

  


  


  I also tried using AudioKit but it has a critical problem that does not meet with my requirement so I dropped it.

  


  I am looking for advice here. Thanks !

  


• How to set "ch_layout" in ffmpeg 6.1 ?

  9 juillet 2024, par Steven porite

  In 6.1 Ffmpeg, it use "ch_layout" to replace the "channel_layout" and "number". The "ch_layout" is "AVChannelLayout *" type. This type is defined in channel_layout.h, some kind of "ch_layout" is defined in this file too.
If I want to use the "av_dict_set_int()" set the "ch_layout" to "AV_CHANNEL_LAYOUT_STEREO", what should I fill to the "value" ?

  


  /**
 * Macro to define native channel layouts
 *
 * @note This doesn't use designated initializers for compatibility with C++ 17 and older.
 */
#define AV_CHANNEL_LAYOUT_MASK(nb, m) \
    { /* .order */ AV_CHANNEL_ORDER_NATIVE, \
      /* .nb_channels */  (nb), \
      /* .u.mask */ { m }, \
      /* .opaque */ NULL }

/**
 * @name Common pre-defined channel layouts
 * @{
 */
#define AV_CHANNEL_LAYOUT_MONO              AV_CHANNEL_LAYOUT_MASK(1,  AV_CH_LAYOUT_MONO)
#define AV_CHANNEL_LAYOUT_STEREO            AV_CHANNEL_LAYOUT_MASK(2,  AV_CH_LAYOUT_STEREO)
#define AV_CHANNEL_LAYOUT_2POINT1           AV_CHANNEL_LAYOUT_MASK(3,  AV_CH_LAYOUT_2POINT1)
#define AV_CHANNEL_LAYOUT_2_1               AV_CHANNEL_LAYOUT_MASK(3,  AV_CH_LAYOUT_2_1)


  


  /**
 * Convenience wrapper for av_dict_set() that converts the value to a string
 * and stores it.
 *
 * Note: If ::AV_DICT_DONT_STRDUP_KEY is set, key will be freed on error.
 */
int av_dict_set_int(AVDictionary **pm, const char *key, int64_t value, int flags);