コード例 #1
0
ファイル: gstrtpamrpay.c プロジェクト: PeterXu/gst-mobile
static gboolean
gst_rtp_amr_pay_setcaps (GstRTPBasePayload * basepayload, GstCaps * caps)
{
  GstRtpAMRPay *rtpamrpay;
  gboolean res;
  const GstStructure *s;
  const gchar *str;

  rtpamrpay = GST_RTP_AMR_PAY (basepayload);

  /* figure out the mode Narrow or Wideband */
  s = gst_caps_get_structure (caps, 0);
  if ((str = gst_structure_get_name (s))) {
    if (strcmp (str, "audio/AMR") == 0)
      rtpamrpay->mode = GST_RTP_AMR_P_MODE_NB;
    else if (strcmp (str, "audio/AMR-WB") == 0)
      rtpamrpay->mode = GST_RTP_AMR_P_MODE_WB;
    else
      goto wrong_type;
  } else
    goto wrong_type;

  if (rtpamrpay->mode == GST_RTP_AMR_P_MODE_NB)
    gst_rtp_base_payload_set_options (basepayload, "audio", TRUE, "AMR", 8000);
  else
    gst_rtp_base_payload_set_options (basepayload, "audio", TRUE, "AMR-WB",
        16000);

  res = gst_rtp_base_payload_set_outcaps (basepayload,
      "encoding-params", G_TYPE_STRING, "1", "octet-align", G_TYPE_STRING, "1",
      /* don't set the defaults
       *
       * "crc", G_TYPE_STRING, "0",
       * "robust-sorting", G_TYPE_STRING, "0",
       * "interleaving", G_TYPE_STRING, "0",
       */
      NULL);

  return res;

  /* ERRORS */
wrong_type:
  {
    GST_ERROR_OBJECT (rtpamrpay, "unsupported media type '%s'",
        GST_STR_NULL (str));
    return FALSE;
  }
}
コード例 #2
0
ファイル: gstrtpamrpay.c プロジェクト: PeterXu/gst-mobile
static GstStateChangeReturn
gst_rtp_amr_pay_change_state (GstElement * element, GstStateChange transition)
{
  GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS;

  /* handle upwards state changes here */
  switch (transition) {
    default:
      break;
  }

  ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);

  /* handle downwards state changes */
  switch (transition) {
    case GST_STATE_CHANGE_PAUSED_TO_READY:
      gst_rtp_amr_pay_reset (GST_RTP_AMR_PAY (element));
      break;
    default:
      break;
  }

  return ret;
}
コード例 #3
0
static GstFlowReturn
gst_rtp_amr_pay_handle_buffer (GstBaseRTPPayload * basepayload,
    GstBuffer * buffer)
{
  GstRtpAMRPay *rtpamrpay;
  GstFlowReturn ret;
  guint size, payload_len;
  GstBuffer *outbuf;
  guint8 *payload, *data, *payload_amr;
  GstClockTime timestamp, duration;
  guint packet_len, mtu;
  gint i, num_packets, num_nonempty_packets;
  gint amr_len;
  gint *frame_size;

  rtpamrpay = GST_RTP_AMR_PAY (basepayload);
  mtu = GST_BASE_RTP_PAYLOAD_MTU (rtpamrpay);

  size = GST_BUFFER_SIZE (buffer);
  data = GST_BUFFER_DATA (buffer);
  timestamp = GST_BUFFER_TIMESTAMP (buffer);
  duration = GST_BUFFER_DURATION (buffer);

  /* setup frame size pointer */
  if (rtpamrpay->mode == GST_RTP_AMR_P_MODE_NB)
    frame_size = nb_frame_size;
  else
    frame_size = wb_frame_size;

  GST_DEBUG_OBJECT (basepayload, "got %d bytes", size);

  /* FIXME, only 
   * octet aligned, no interleaving, single channel, no CRC,
   * no robust-sorting. To fix this you need to implement the downstream
   * negotiation function. */

  /* first count number of packets and total amr frame size */
  amr_len = num_packets = num_nonempty_packets = 0;
  for (i = 0; i < size; i++) {
    guint8 FT;
    gint fr_size;

    FT = (data[i] & 0x78) >> 3;

    fr_size = frame_size[FT];
    GST_DEBUG_OBJECT (basepayload, "frame size %d", fr_size);
    /* FIXME, we don't handle this yet.. */
    if (fr_size <= 0)
      goto wrong_size;

    amr_len += fr_size;
    num_nonempty_packets++;
    num_packets++;
    i += fr_size;
  }
  if (amr_len > size)
    goto incomplete_frame;

  /* we need one extra byte for the CMR, the ToC is in the input
   * data */
  payload_len = size + 1;

  /* get packet len to check against MTU */
  packet_len = gst_rtp_buffer_calc_packet_len (payload_len, 0, 0);
  if (packet_len > mtu)
    goto too_big;

  /* now alloc output buffer */
  outbuf = gst_rtp_buffer_new_allocate (payload_len, 0, 0);

  /* copy timestamp, or fabricate one */
  if (timestamp != GST_CLOCK_TIME_NONE)
    GST_BUFFER_TIMESTAMP (outbuf) = timestamp;
  else {
    /* AMR (nb) and AMR-WB both have 20 ms per frame */
    /* FIXME: when we do more than one AMR frame per packet, fix this */
    gint count = basepayload->seqnum - basepayload->seqnum_base;

    GST_BUFFER_TIMESTAMP (outbuf) = count * 20 * GST_MSECOND;
  }

  if (duration != GST_CLOCK_TIME_NONE)
    GST_BUFFER_DURATION (outbuf) = duration;
  else {
    GST_BUFFER_DURATION (outbuf) = 20 * GST_MSECOND;
  }

  /* get payload, this is now writable */
  payload = gst_rtp_buffer_get_payload (outbuf);

  /*   0 1 2 3 4 5 6 7 
   *  +-+-+-+-+-+-+-+-+
   *  |  CMR  |R|R|R|R|
   *  +-+-+-+-+-+-+-+-+
   */
  payload[0] = 0xF0;            /* CMR, no specific mode requested */

  /* this is where we copy the AMR data, after num_packets FTs and the
   * CMR. */
  payload_amr = payload + num_packets + 1;

  /* copy data in payload, first we copy all the FTs then all
   * the AMR data. The last FT has to have the F flag cleared. */
  for (i = 1; i <= num_packets; i++) {
    guint8 FT;
    gint fr_size;

    /*   0 1 2 3 4 5 6 7
     *  +-+-+-+-+-+-+-+-+
     *  |F|  FT   |Q|P|P| more FT...
     *  +-+-+-+-+-+-+-+-+
     */
    FT = (*data & 0x78) >> 3;

    fr_size = frame_size[FT];

    if (i == num_packets)
      /* last packet, clear F flag */
      payload[i] = *data & 0x7f;
    else
      /* set F flag */
      payload[i] = *data | 0x80;

    memcpy (payload_amr, &data[1], fr_size);

    /* all sizes are > 0 since we checked for that above */
    data += fr_size + 1;
    payload_amr += fr_size;
  }

  gst_buffer_unref (buffer);

  ret = gst_basertppayload_push (basepayload, outbuf);

  return ret;

  /* ERRORS */
wrong_size:
  {
    GST_ELEMENT_ERROR (basepayload, STREAM, FORMAT,
        (NULL), ("received AMR frame with size <= 0"));
    gst_buffer_unref (buffer);

    return GST_FLOW_ERROR;
  }
incomplete_frame:
  {
    GST_ELEMENT_ERROR (basepayload, STREAM, FORMAT,
        (NULL), ("received incomplete AMR frames"));
    gst_buffer_unref (buffer);

    return GST_FLOW_ERROR;
  }
too_big:
  {
    GST_ELEMENT_ERROR (basepayload, STREAM, FORMAT,
        (NULL), ("received too many AMR frames for MTU"));
    gst_buffer_unref (buffer);

    return GST_FLOW_ERROR;
  }
}
コード例 #4
0
ファイル: gstrtpamrpay.c プロジェクト: PeterXu/gst-mobile
static GstFlowReturn
gst_rtp_amr_pay_handle_buffer (GstRTPBasePayload * basepayload,
    GstBuffer * buffer)
{
  GstRtpAMRPay *rtpamrpay;
  const gint *frame_size;
  GstFlowReturn ret;
  guint payload_len;
  GstMapInfo map;
  GstBuffer *outbuf;
  guint8 *payload, *ptr, *payload_amr;
  GstClockTime timestamp, duration;
  guint packet_len, mtu;
  gint i, num_packets, num_nonempty_packets;
  gint amr_len;
  gboolean sid = FALSE;
  GstRTPBuffer rtp = { NULL };

  rtpamrpay = GST_RTP_AMR_PAY (basepayload);
  mtu = GST_RTP_BASE_PAYLOAD_MTU (rtpamrpay);

  gst_buffer_map (buffer, &map, GST_MAP_READ);

  timestamp = GST_BUFFER_TIMESTAMP (buffer);
  duration = GST_BUFFER_DURATION (buffer);

  /* setup frame size pointer */
  if (rtpamrpay->mode == GST_RTP_AMR_P_MODE_NB)
    frame_size = nb_frame_size;
  else
    frame_size = wb_frame_size;

  GST_DEBUG_OBJECT (basepayload, "got %" G_GSIZE_FORMAT " bytes", map.size);

  /* FIXME, only
   * octet aligned, no interleaving, single channel, no CRC,
   * no robust-sorting. To fix this you need to implement the downstream
   * negotiation function. */

  /* first count number of packets and total amr frame size */
  amr_len = num_packets = num_nonempty_packets = 0;
  for (i = 0; i < map.size; i++) {
    guint8 FT;
    gint fr_size;

    FT = (map.data[i] & 0x78) >> 3;

    fr_size = frame_size[FT];
    GST_DEBUG_OBJECT (basepayload, "frame type %d, frame size %d", FT, fr_size);
    /* FIXME, we don't handle this yet.. */
    if (fr_size <= 0)
      goto wrong_size;

    if (fr_size == 5)
      sid = TRUE;

    amr_len += fr_size;
    num_nonempty_packets++;
    num_packets++;
    i += fr_size;
  }
  if (amr_len > map.size)
    goto incomplete_frame;

  /* we need one extra byte for the CMR, the ToC is in the input
   * data */
  payload_len = map.size + 1;

  /* get packet len to check against MTU */
  packet_len = gst_rtp_buffer_calc_packet_len (payload_len, 0, 0);
  if (packet_len > mtu)
    goto too_big;

  /* now alloc output buffer */
  outbuf = gst_rtp_buffer_new_allocate (payload_len, 0, 0);

  gst_rtp_buffer_map (outbuf, GST_MAP_WRITE, &rtp);

  /* copy timestamp */
  GST_BUFFER_TIMESTAMP (outbuf) = timestamp;

  if (duration != GST_CLOCK_TIME_NONE)
    GST_BUFFER_DURATION (outbuf) = duration;
  else {
    GST_BUFFER_DURATION (outbuf) = num_packets * 20 * GST_MSECOND;
  }

  if (GST_BUFFER_IS_DISCONT (buffer)) {
    GST_DEBUG_OBJECT (basepayload, "discont, setting marker bit");
    GST_BUFFER_FLAG_SET (outbuf, GST_BUFFER_FLAG_DISCONT);
    gst_rtp_buffer_set_marker (&rtp, TRUE);
    gst_rtp_amr_pay_recalc_rtp_time (rtpamrpay, timestamp);
  }

  if (G_UNLIKELY (sid)) {
    gst_rtp_amr_pay_recalc_rtp_time (rtpamrpay, timestamp);
  }

  /* perfect rtptime */
  if (G_UNLIKELY (!GST_CLOCK_TIME_IS_VALID (rtpamrpay->first_ts))) {
    rtpamrpay->first_ts = timestamp;
    rtpamrpay->first_rtp_time = rtpamrpay->next_rtp_time;
  }
  GST_BUFFER_OFFSET (outbuf) = rtpamrpay->next_rtp_time;
  rtpamrpay->next_rtp_time +=
      (num_packets * 160) << (rtpamrpay->mode == GST_RTP_AMR_P_MODE_WB);

  /* get payload, this is now writable */
  payload = gst_rtp_buffer_get_payload (&rtp);

  /*   0 1 2 3 4 5 6 7
   *  +-+-+-+-+-+-+-+-+
   *  |  CMR  |R|R|R|R|
   *  +-+-+-+-+-+-+-+-+
   */
  payload[0] = 0xF0;            /* CMR, no specific mode requested */

  /* this is where we copy the AMR data, after num_packets FTs and the
   * CMR. */
  payload_amr = payload + num_packets + 1;

  /* copy data in payload, first we copy all the FTs then all
   * the AMR data. The last FT has to have the F flag cleared. */
  ptr = map.data;
  for (i = 1; i <= num_packets; i++) {
    guint8 FT;
    gint fr_size;

    /*   0 1 2 3 4 5 6 7
     *  +-+-+-+-+-+-+-+-+
     *  |F|  FT   |Q|P|P| more FT...
     *  +-+-+-+-+-+-+-+-+
     */
    FT = (*ptr & 0x78) >> 3;

    fr_size = frame_size[FT];

    if (i == num_packets)
      /* last packet, clear F flag */
      payload[i] = *ptr & 0x7f;
    else
      /* set F flag */
      payload[i] = *ptr | 0x80;

    memcpy (payload_amr, &ptr[1], fr_size);

    /* all sizes are > 0 since we checked for that above */
    ptr += fr_size + 1;
    payload_amr += fr_size;
  }

  gst_buffer_unmap (buffer, &map);
  gst_buffer_unref (buffer);

  gst_rtp_buffer_unmap (&rtp);

  ret = gst_rtp_base_payload_push (basepayload, outbuf);

  return ret;

  /* ERRORS */
wrong_size:
  {
    GST_ELEMENT_ERROR (basepayload, STREAM, FORMAT,
        (NULL), ("received AMR frame with size <= 0"));
    gst_buffer_unmap (buffer, &map);
    gst_buffer_unref (buffer);

    return GST_FLOW_ERROR;
  }
incomplete_frame:
  {
    GST_ELEMENT_ERROR (basepayload, STREAM, FORMAT,
        (NULL), ("received incomplete AMR frames"));
    gst_buffer_unmap (buffer, &map);
    gst_buffer_unref (buffer);

    return GST_FLOW_ERROR;
  }
too_big:
  {
    GST_ELEMENT_ERROR (basepayload, STREAM, FORMAT,
        (NULL), ("received too many AMR frames for MTU"));
    gst_buffer_unmap (buffer, &map);
    gst_buffer_unref (buffer);

    return GST_FLOW_ERROR;
  }
}