func: static int amr_nb_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
  
                                 const AVFrame *frame, int *got_packet_ptr)
  
  {
  
      AMRContext *s = avctx->priv_data;
  
      int written, ret;
  
      int16_t *flush_buf = NULL;
  
      const int16_t *samples = frame ? (const int16_t *)frame->data[0] : NULL;
  
  
  
      if (s->enc_bitrate != avctx->bit_rate) {
  
          s->enc_mode    = get_bitrate_mode(avctx->bit_rate, avctx);
  
          s->enc_bitrate = avctx->bit_rate;
  
      }
  
  
  
      if ((ret = ff_alloc_packet(avpkt, 32))) {
  
          av_log(avctx, AV_LOG_ERROR, "Error getting output packet\n");
  
          return ret;
  
      }
  
  
  
      if (frame) {
  
          if (frame->nb_samples < avctx->frame_size) {
  
              flush_buf = av_mallocz(avctx->frame_size * sizeof(*flush_buf));
  
              if (!flush_buf)
  
                  return AVERROR(ENOMEM);
  
              memcpy(flush_buf, samples, frame->nb_samples * sizeof(*flush_buf));
  
              samples = flush_buf;
  
              if (frame->nb_samples < avctx->frame_size - avctx->delay)
  
                  s->enc_last_frame = -1;
  
          }
  
          if ((ret = ff_af_queue_add(&s->afq, frame)) < 0) {
  
              av_freep(&flush_buf);
  
              return ret;
  
          }
  
      } else {
  
          if (s->enc_last_frame < 0)
  
              return 0;
  
          flush_buf = av_mallocz(avctx->frame_size * sizeof(*flush_buf));
  
          if (!flush_buf)
  
              return AVERROR(ENOMEM);
  
          samples = flush_buf;
  
          s->enc_last_frame = -1;
  
      }
  
  
  
      written = Encoder_Interface_Encode(s->enc_state, s->enc_mode, samples,
  
                                         avpkt->data, 0);
  
      av_dlog(avctx, "amr_nb_encode_frame encoded %u bytes, bitrate %u, first byte was %#02x\n",
  
              written, s->enc_mode, frame[0]);
  
  
  
      /* Get the next frame pts/duration */
  
      ff_af_queue_remove(&s->afq, avctx->frame_size, &avpkt->pts,
  
                         &avpkt->duration);
  
  
  
      avpkt->size = written;
  
      *got_packet_ptr = 1;
  
      av_freep(&flush_buf);
  
      return 0;
  
  }
  