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c++ - Configure AVCodecContext structure to encode …
https://stackoverflow.com/questions/43974705/configure-avcodeccontext-structure-to-encode-from-raw-pcm-to-u-law
So, before passing your raw pcm audio samples to libavcodec you have to convert them to 8kHz with swresample or any other lib that can do that. If you capture your raw pcm yourself usually you can request 8kHz sampling rate from the os sound api. I'm pretty sure on android devices you can request 8kHz audio.
FFmpeg: Core functions/structures.
https://www.ffmpeg.org/doxygen/trunk/group__lavc__core.html
Calling this function on an AVCodecContext that hasn't been opened will free the codec-specific data allocated in avcodec_alloc_context3() with a non-NULL codec. Subsequent calls will do nothing. Note Do not use this function. Use avcodec_free_context() to destroy a codec context (either open or closed). Opening and closing a codec context multiple times is not supported …
FFmpeg/encode_audio.c at master · FFmpeg/FFmpeg · …
https://github.com/FFmpeg/FFmpeg/blob/master/doc/examples/encode_audio.c
codec = avcodec_find_encoder (AV_CODEC_ID_MP2); if (!codec) {fprintf (stderr, " Codec not found \n "); exit (1);} c = avcodec_alloc_context3 (codec); if (!c) {fprintf (stderr, " Could not allocate audio codec context \n "); exit (1);} /* put sample parameters */ c-> bit_rate = 64000; /* check that the encoder supports s16 pcm input */ c-> sample_fmt = AV_SAMPLE_FMT_S16;
C++ (Cpp) avcodec_decode_audio4 Examples - HotExamples
https://cpp.hotexamples.com/examples/-/-/avcodec_decode_audio4/cpp-avcodec_decode_audio4-function-examples.html
C++ (Cpp) avcodec_decode_audio4 - 30 examples found. These are the top rated real world C++ (Cpp) examples of avcodec_decode_audio4 extracted from open source projects. You can rate examples to help us improve the quality of examples.
ffmpeg aac音频编码例程（ffmpeg-2.3.6下亲测可用） - …
http://www.cnitblog.com/luofuchong/archive/2017/02/10/90516.html
c = avcodec_alloc_context3(audio_codec); // c-> strict_std_compliance = FF_COMPLIANCE_EXPERIMENTAL; c-> codec_id = AV_CODEC_ID_AAC; c-> sample_fmt = …
FFmpeg: doc/examples/decoding_encoding.c
https://ffmpeg.org/doxygen/trunk/doc_2examples_2decoding__encoding_8c-example.html
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