how to stream video and audio

[Mohamed]

how to stream video and audio from raspberry pi with less latency

[Nikhil P.R.]

Try this for audio

 

1. Make sure you compile against this implementation / version of ortp 

ortp-0.22.0.tar.gz

Get it from here : http://download.savannah.nongnu.org/rel … p/sources/

 

 

2. I changed the opus encoder / decoder to int16 from float – due to my audio devices was simple 

16 bit cheep stuf. 

changes to tx.c rx.c and device.c

 

 

jakobsen@w520:~/work/trx/trx-0.3$ diff rx.c /home/jakobsen/work/friaudio/pi_node/src/trx/rx.c 

73c73,74

< float *pcm;

—

> //float *pcm;

> opus_int16 *pcm;

79c80,81

< r = opus_decode_float(decoder, NULL, 0, pcm, samples, 1);

—

> r = opus_decode(decoder, NULL, 0, pcm, samples, 1);

> // r = opus_decode_float(decoder, NULL, 0, pcm, samples, 1);

81c83,84

< r = opus_decode_float(decoder, packet, len, pcm, samples, 0);

—

> r = opus_decode(decoder, packet, len, pcm, samples, 0);

> // r = opus_decode_float(decoder, packet, len, pcm, samples, 0);

241c244,245

< 

—

> 

> 

268a273

> 

 

jakobsen@w520:~/work/trx/trx-0.3$ diff tx.c /home/jakobsen/work/friaudio/pi_node/src/trx/tx.c 

63c63,64

< float *pcm;

—

> //float *pcm;

> opus_int16 *pcm;

91c92,93

< z = opus_encode_float(encoder, pcm, samples, packet, bytes_per_frame);

—

> z = opus_encode(encoder, pcm, samples, packet, bytes_per_frame);

> //z = opus_encode_float(encoder, pcm, samples, packet, bytes_per_frame);

245,246c247,248

 

jakobsen@w520:~/work/trx/trx-0.3$ diff device.c /home/jakobsen/work/friaudio/pi_node/src/trx/device.c 

56c56

< r = snd_pcm_hw_params_set_format(pcm, hw, SND_PCM_FORMAT_FLOAT);

—

> r = snd_pcm_hw_params_set_format(pcm, hw, SND_PCM_FORMAT_S16_LE); //SND_PCM_FORMAT_FLOAT);

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