[Libav-user] Encoding Speex with libavcodec ?

[ashika umanga]

Greetings all,


I successfully compiled **libavcodec** with **speex** enabled.
I modified example from FFMPEG docs to encode the sample audio into Speex.
But the result file cannot be played with VLC Player(which has Speex
decoder).

Any tips?

    static void audio_encode_example(const char *filename)
    {
        AVCodec *codec;
        AVCodecContext *c= NULL;
        int frame_size, i, j, out_size, outbuf_size;
        FILE *f;
        short *samples;
        float t, tincr;
        uint8_t *outbuf;

        printf("Audio encoding\n");

        /* find the MP2 encoder */
        codec = avcodec_find_encoder(CODEC_ID_SPEEX);
        if (!codec) {
            fprintf(stderr, "codec not found\n");
            exit(1);
        }

       c= avcodec_alloc_context();

        /* put sample parameters */
        c->bit_rate = 64000;
        c->sample_rate = 32000;
        c->channels = 2;
        c->sample_fmt=AV_SAMPLE_FMT_S16;

        /* open it */
        if (avcodec_open(c, codec) < 0) {
            fprintf(stderr, "could not open codec\n");
            exit(1);
        }

        /* the codec gives us the frame size, in samples */
        frame_size = c->frame_size;
        printf("frame size %d\n",frame_size);
        samples =(short*) malloc(frame_size * 2 * c->channels);
        outbuf_size = 10000;
       outbuf =( uint8_t*) malloc(outbuf_size);

        f = fopen(filename, "wb");
        if (!f) {
            fprintf(stderr, "could not open %s\n", filename);
            exit(1);
        }

        /* encode a single tone sound */
        t = 0;
        tincr = 2 * M_PI * 440.0 / c->sample_rate;
        for(i=0;i<200;i++) {
            for(j=0;j<frame_size;j++) {
                samples[2*j] = (int)(sin(t) * 10000);
                samples[2*j+1] = samples[2*j];
                t += tincr;
            }
            /* encode the samples */
            out_size = avcodec_encode_audio(c, outbuf, outbuf_size,
samples);
            fwrite(outbuf, 1, out_size, f);
        }
        fclose(f);
        free(outbuf);
        free(samples);
        avcodec_close(c);
        av_free(c);
    }

    int main(int argc, char **argv)
    {

     avcodec_register_all();

     audio_encode_example(argv[1]);

     return 0;
    }
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