Paul wrote:
> i get output_example.c in installation of ffmpeg..
>
> i care about encoding audio frame from PCM to MPEG,
>
> i see these code:
>
> void get_audio_frame(int16_t *samples, int frame_size, int
> nb_channels) { int j, i, v; int16_t *q;
>
> q = samples; for(j=0;j<frame_size;j++) { v = (int)(sin(t) * 10000);
> for(i = 0; i < nb_channels; i++) *q++ = v; t += tincr; tincr +=
> tincr2; }
>
> }
>
> the samples point will be use for the function write_audio_frame. So
> if run my app (code copy from output_example.c ) then this work. But
> now, i would like to to use buffer PCM instead of constant values of
> samples .
>
> Beside that, I used directsound and can get each captured buffer .
> The data of buffer were stored in this point: VOID * pbCaptureData
>
> So, how i can use data or change data for samples . I would like pass
> all data of pbCaptureData to samples . And after this, i will call
> function write_audio_frame.
>
> Please help me how to do that?
get_audio_frame simply synthesizes a frame. If you grab real ones, what
you need is a function to extract frame_size*nb_channels samples from
your data. If what remains in pbCaptureData is not enough, grab another
buffer. If its too much, keep the remainder somewhere.
output_example has mostly tutorial value. For 'real' applications,
ffmpeg.c itself is *the* reference.
Greetings,
--
Michel Bardiaux
R&D Director
T +32 [0] 2 790 29 41
F +32 [0] 2 790 29 02
E mailto:mbardiaux at mediaxim.be
Mediaxim NV/SA
Vorstlaan 191 Boulevard du Souverain
Brussel 1160 Bruxelles
http://www.mediaxim.com/
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