[Libav-user] ffmpeg on android

[Sylvio José Alves Neto]

Marcelo, have you initialized the ffmpeg using av_register_all()?

Also, when building the ffmpeg, have you included encoding/decoding/
parsing support for aac?

Sylvio
 Em 12/01/2014 16:18, "Marcelo Paes Rech" <marcelopaesrech at gmail.com>
escreveu:

> Hi guys,
>
> I am trying to do a stream player in android but I need to read a array of
> bytes and then decode every packet of array of bytes. In the end started to
> make my AAC decoder work with the ffmpeg example of decoder. But I ran into
> the same problem of this guy:
>
>
> http://stackoverflow.com/questions/13499480/decode-aac-to-pcm-with-ffmpeg-on-android
>
> But the decoder does not work. I am receiving a error as follows:
>
> TNS filter order %d is greater than maximum %d.
> Error while decoding: -1
>
> If I use the ffmpeg to decode it works fine.
>
> ffmpeg -i audio.mp4 audio.wav
>
> Environment:
> ffmpeg 1.2
> Android ndkr9b
>
> Follows my source code:
>
>     AVCodec *codec;
>
>     AVCodecContext *c= NULL;
>
>     int len;
>
>     FILE *f, *outfile;
>
>     uint8_t inbuf[AUDIO_INBUF_SIZE + FF_INPUT_BUFFER_PADDING_SIZE];
>
>     AVPacket avpkt;
>
>     AVFrame *decoded_frame = NULL;
>
>     av_log_set_callback(&my_ffmpeg_log);
>
>     av_init_packet(&avpkt);
>
>
>     printf("Decode audio file %s to %s\n", filename, outfilename);
>
>
>     /* find the mpeg audio decoder */
>
>     codec = avcodec_find_decoder(AV_CODEC_ID_AAC);
>
>     if (!codec) {
>
>         LOGV("Codec not found\n");
>
>         return;
>
>     }
>
>
>     c = avcodec_alloc_context3(codec);
>
>     c->channels = 2;
>
>     c->sample_rate = 48000;
>
>
>     if (!c) {
>
>         LOGV("Could not  allocate audio codec context\n");
>
>         return;
>
>     }
>
>
>     /* open it */
>
>     if (avcodec_open2(c, codec, NULL) < 0) {
>
>         LOGV("Could not open codec\n");
>
>         return;
>
>     }
>
>
>     f = fopen(filename, "rb");
>
>     if (!f) {
>
>         LOGV("Could not open %s\n", filename);
>
>         return;
>
>     }
>
>     outfile = fopen(outfilename, "wb");
>
>     if (!outfile) {
>
>         av_free(c);
>
>         return;
>
>     }
>
>
>     /* decode until eof */
>
>     avpkt.data = inbuf;
>
>     avpkt.size = fread(inbuf, 1, AUDIO_INBUF_SIZE, f);
>
>
>     while (avpkt.size > 0) {
>
>         int got_frame = 0;
>
>
>         if (!decoded_frame) {
>
>             if (!(decoded_frame = avcodec_alloc_frame())) {
>
>                 LOGV("Could not allocate audio frame\n");
>
>                 return;
>
>             }
>
>         } else
>
>             avcodec_get_frame_defaults(decoded_frame);
>
>
>         len = avcodec_decode_audio4(c, decoded_frame, &got_frame, &avpkt);
>
>         if (len < 0) {
>
>             LOGV("Error while decoding: %d\n", len);
>
>             return;
>
>         }
>
>         if (got_frame) {
>
>             /* if a frame has been decoded, output it */
>
>             int data_size = av_samples_get_buffer_size(NULL, c->channels,
>
>
> decoded_frame->nb_samples,
>
>                                                        c->sample_fmt, 1);
>
>             fwrite(decoded_frame->data[0], 1, data_size, outfile);
>
>         }
>
>         avpkt.size -= len;
>
>         avpkt.data += len;
>
>         avpkt.dts =
>
>         avpkt.pts = AV_NOPTS_VALUE;
>
>         if (avpkt.size < AUDIO_REFILL_THRESH) {
>
>             /* Refill the input buffer, to avoid trying to decode
>
>              * incomplete frames. Instead of this, one could also use
>
>              * a parser, or use a proper container format through
>
>              * libavformat. */
>
>             memmove(inbuf, avpkt.data, avpkt.size);
>
>             avpkt.data = inbuf;
>
>             len = fread(avpkt.data + avpkt.size, 1,
>
>                         AUDIO_INBUF_SIZE - avpkt.size, f);
>
>             if (len > 0)
>
>                 avpkt.size += len;
>
>         }
>
>     }
>
>
>     fclose(outfile);
>
>     fclose(f);
>
>
>     avcodec_close(c);
>
>     av_free(c);
>
>     avcodec_free_frame(&decoded_frame);
>
> --
> *Atenciosamente, Marcelo Paes Rech.*
> E-mail: marcelopaesrech at gmail.com
> Blog: http://marcelopaesrech.blogspot.com
>
>
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>
>
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