[Libav-user] FFmpeg Audio Play

[anshul]

On 04/16/2014 03:55 PM, Yamusani Vinay wrote:
> Thanks for the reply,I checked it got some what I need I have another 
> doubt here in avio_reading.c it is directly mapping file to a byte 
> array but what I need is,to ffmpeg I need to pass a sample byte array 
> with some values i.e then ffmpeg need to play those bytes.
>
> I tried with the following code:
>
> what I did is I am passing a byte array which contains some values 
> from my java code and copying that to uint *buffer_temp and assigned 
> it to bd
>
> struct buffer_data {
>
> uint8_t *ptr;
>
> size_tsize; ///< size left in the buffer
>
> };
>
>
> struct buffer_data bd = { 0 };
>
>
> jbyte *bytesTemp = (*env)->GetByteArrayElements(env, inputArray,NULL);
>
> buffer_temp = av_malloc(length);
>
> memcpy(buffer_temp,bytesTemp,length);
>
> bd.ptr = buffer_temp;
>
> bd.size = length;
>
>
> fmt_ctx->pb = bd;
>
> from here I am trying to open file by using below code
>
> if ((ret = avformat_open_input(&fmt_ctx, NULL, NULL, &m_iFormatOpts)) < 0)
>
> {
>
> LOGE("Cannot open input file\n");
>
> return;
>
> }
>
>
> then I am getting ret <0
>
>
> So please help me in solving this problem.
>
>
> Thanks & Regards,
>
> Vinay.
>
>
>
> On Mon, Apr 14, 2014 at 11:12 AM, Anshul <anshul.ffmpeg at gmail.com 
> <mailto:anshul.ffmpeg at gmail.com>> wrote:
>
>     Yamusani Vinay <yamusanivinay at gmail.com
>     <mailto:yamusanivinay at gmail.com>> wrote:
>     >Hi All,
>     >
>     >I am developing an android app where I need to play music.I know
>     how to
>     >play audio using ffmpeg by giving the audio path.but my problem is in
>     >my
>     >application I will get audio stream in  the form of bytes.So anyone
>     >please
>     >help me in playing these audio bytes using ffmpeg.
>     >
>     >input:audio stream in the form of bytes.
>     >
>     >Thanks,
>     >Vinay Yamusani.
>     >
>     >
>     >------------------------------------------------------------------------
>     >
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>
>
>     Since u have posted at libav I consider you would be using library
>     not ffmpeg binary.
>
>     You should start with avio_ reading.c example at doc/examples.
>
>
>     -Anshul
>
>     --
>     Sent from my Android device with K-9 Mail. Please excuse my brevity.
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>
>
>
>
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Please don't top Post, Its consider rude.

I think you missed some thing from example.
pb is not the buffer where you can copy your audio data.

In pb you need to register a callback function which will be called when 
ffmpeg library require data.

here is how this is done....
     avio_ctx = avio_alloc_context(avio_ctx_buffer, avio_ctx_buffer_size,
                                   0, &bd, &read_packet, NULL, NULL);
     if (!avio_ctx) {
         ret = AVERROR(ENOMEM);
         goto end;
     }
     fmt_ctx->pb = avio_ctx;

-Anshul

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