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• swscale/range_convert : saturate output instead of limiting input

  24 septembre 2024, par Ramiro Polla

  swscale/range_convert : saturate output instead of limiting input
  For bit depths <= 14, the result is saturated to 15 bits.
  
  For bit depths > 14, the result is saturated to 19 bits.
  x86_64 :
  
  chrRangeFromJpeg8_1920_c :    2126.5   2127.4  (1.00x)
  
  chrRangeFromJpeg16_1920_c :   2331.4   2325.2  (1.00x)
  
  chrRangeToJpeg8_1920_c :      3163.0   3166.9  (1.00x)
  
  chrRangeToJpeg16_1920_c :     3163.7   2152.4  (1.47x)
  
  lumRangeFromJpeg8_1920_c :    1262.2   1263.0  (1.00x)
  
  lumRangeFromJpeg16_1920_c :   1079.5   1080.5  (1.00x)
  
  lumRangeToJpeg8_1920_c :      1860.5   1886.8  (0.99x)
  
  lumRangeToJpeg16_1920_c :     1910.2   1077.0  (1.77x)
  aarch64 A55 :
  
  chrRangeFromJpeg8_1920_c :   28836.2  28835.2  (1.00x)
  
  chrRangeFromJpeg16_1920_c :  28840.1  28839.8  (1.00x)
  
  chrRangeToJpeg8_1920_c :     44196.2  23074.7  (1.92x)
  
  chrRangeToJpeg16_1920_c :    36527.3  17318.9  (2.11x)
  
  lumRangeFromJpeg8_1920_c :   15388.5  15389.7  (1.00x)
  
  lumRangeFromJpeg16_1920_c :  15389.3  15388.2  (1.00x)
  
  lumRangeToJpeg8_1920_c :     23069.7  19227.8  (1.20x)
  
  lumRangeToJpeg16_1920_c :    19227.8  15387.0  (1.25x)
  aarch64 A76 :
  
  chrRangeFromJpeg8_1920_c :    6334.7   6324.4  (1.00x)
  
  chrRangeFromJpeg16_1920_c :   6336.0   6339.9  (1.00x)
  
  chrRangeToJpeg8_1920_c :     11474.5   9656.0  (1.19x)
  
  chrRangeToJpeg16_1920_c :     9640.5   6340.4  (1.52x)
  
  lumRangeFromJpeg8_1920_c :    4453.2   4422.0  (1.01x)
  
  lumRangeFromJpeg16_1920_c :   4414.2   4420.9  (1.00x)
  
  lumRangeToJpeg8_1920_c :      6645.0   5949.1  (1.12x)
  
  lumRangeToJpeg16_1920_c :     6005.2   4446.8  (1.35x)
  NOTE : all simd optimizations for range_convert have been disabled
  
        except for x86, which already had the same behaviour.
  
        they will be re-enabled when they are fixed for each architecture.
  

  • [DH] libswscale/aarch64/swscale.c
  • [DH] libswscale/loongarch/swscale_init_loongarch.c
  • [DH] libswscale/riscv/swscale.c
  • [DH] libswscale/swscale.c
  • [DH] libswscale/x86/range_convert.asm

• Compiling ffmpeg for IOS (R_ABS reloc error)

  14 septembre 2024, par Oliver Hume

  I've been trying to compile the ffmpeg libraries for IOS. I can get it to work if I use —disable-asm, but for performance I'd like to build with them enabled.

  



  This is one of many configure commands I've used.

  



  ./configure --prefix=armv7 --disable-ffmpeg --disable-ffplay --disable-ffprobe --disable-ffserver --enable-avresample --enable-cross-compile --sysroot="/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS6.0.sdk" --target-os=darwin --cc="/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/llvm-gcc" --extra-cflags="-arch armv7 -miphoneos-version-min=5.0" --extra-ldflags="-arch armv7 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS6.0.sdk -miphoneos-version-min=6.0" --arch=arm --cpu=cortex-a9 --disable-everything --enable-pic --enable-static --disable-shared

  



  It compiles fine, but when I try to link against it in my project I get :

  



  ld : in /ffmpeg/libavcodec/libavcodec.a(simple_idct_armv5te.o), in section _TEXT,_text reloc 0 : R_ABS reloc but no absolute symbol at target address for architecture armv7

  



  Am I missing some key option ? I've tried using the 1.0 build and the latest git version of ffmpeg.

  


• Compiling live555 and ffmpeg with Xcode 5

  11 septembre 2024, par Kai

  In my current project we need to use both live555 and ffmpeg libraries in the same project. We are able to build and run sample for both projects without issues, but when merging both projects into the project the following compiler errors were encountered :

  



  Undefined symbols for architecture armv7:
  "av_free_packet(AVPacket*)", referenced from:
      -[MyRtspClient readFFmpegAudioFrameAndDecode] in MyRtspClient.o
  "av_read_frame(AVFormatContext*, AVPacket*)", referenced from:
      -[MyRtspClient readFFmpegAudioFrameAndDecode] in MyRtspClient.o
  "av_strerror(int, char*, unsigned long)", referenced from:
      -[MyRtspClient readFFmpegAudioFrameAndDecode] in MyRtspClient.o
  "av_dict_set(AVDictionary**, char const*, char const*, int)", referenced from:
      -[MyRtspClient initFFmpegAudioStream] in MyRtspClient.o
  "av_init_packet(AVPacket*)", referenced from:
      -[MyRtspClient readFFmpegAudioFrameAndDecode] in MyRtspClient.o
  "avcodec_register_all()", referenced from:
      -[MyRtspClient initFFmpegAudioStream] in MyRtspClient.o
  "av_register_all()", referenced from:
      -[MyRtspClient initFFmpegAudioStream] in MyRtspClient.o
  "av_log_set_level(int)", referenced from:
      -[MyRtspClient initFFmpegAudioStream] in MyRtspClient.o
  "av_log(void*, int, char const*, ...)", referenced from:
      -[MyRtspClient initFFmpegAudioStream] in MyRtspClient.o
  "avformat_alloc_context()", referenced from:
      -[MyRtspClient initFFmpegAudioStream] in MyRtspClient.o
  "avformat_network_deinit()", referenced from:
      -[MyRtspClient destroyFFmpegAudioStream] in MyRtspClient.o
  "avformat_open_input(AVFormatContext**, char const*, AVInputFormat*, AVDictionary**)", referenced from:
      -[MyRtspClient initFFmpegAudioStream] in MyRtspClient.o
  "avformat_find_stream_info(AVFormatContext*, AVDictionary**)", referenced from:
      -[MyRtspClient initFFmpegAudioStream] in MyRtspClient.o
  "av_find_best_stream(AVFormatContext*, AVMediaType, int, int, AVCodec**, int)", referenced from:
      -[MyRtspClient initFFmpegAudioStream] in MyRtspClient.o
  "av_dump_format(AVFormatContext*, int, char const*, int)", referenced from:
      -[MyRtspClient initFFmpegAudioStream] in MyRtspClient.o
  "avcodec_open2(AVCodecContext*, AVCodec const*, AVDictionary**)", referenced from:
      -[MyRtspClient initFFmpegAudioStream] in MyRtspClient.o
  "avformat_network_init()", referenced from:
      -[MyRtspClient initFFmpegAudioStream] in MyRtspClient.o
  "av_dict_free(AVDictionary**)", referenced from:
      -[MyRtspClient initFFmpegAudioStream] in MyRtspClient.o
  "avcodec_find_decoder(AVCodecID)", referenced from:
      -[MyRtspClient initFFmpegAudioStream] in MyRtspClient.o
ld: symbol(s) not found for architecture armv7
clang: error: linker command failed with exit code 1 (use -v to see invocation)


  



  I should have included all the required files so I am a bit dumbfounded by this, any suggestion is welcome, thanks.