gstvoamrwbenc.c 8.69 KB
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/* GStreamer Adaptive Multi-Rate Wide-Band (AMR-WB) plugin
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 * Copyright (C) 2006 Edgard Lima <edgard.lima@gmail.com>
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 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the
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 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
 * Boston, MA 02110-1301, USA.
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 */

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/**
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 * SECTION:element-voamrwbenc
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 * @title: voamrwbenc
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 * @see_also: #GstAmrWbDec, #GstAmrWbParse
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 *
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 * AMR wideband encoder based on the
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 * [reference codec implementation](http://www.penguin.cz/~utx/amr).
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 *
 * ## Example launch line
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 * |[
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 * gst-launch filesrc location=abc.wav ! wavparse ! audioresample ! audioconvert ! voamrwbenc ! filesink location=abc.amr
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 * ]|
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 * Please note that the above stream misses the header, that is needed to play
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 * the stream.
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 *
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 */

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#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

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#include "gstvoamrwbenc.h"
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#define MR660  0
#define MR885  1
#define MR1265 2
#define MR1425 2
#define MR1585 3
#define MR1825 4
#define MR1985 5
#define MR2305 6
#define MR2385 7
#define MRDTX  8
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#define L_FRAME16k      320     /* Frame size at 16kHz  */
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static GType
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gst_voamrwbenc_bandmode_get_type (void)
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{
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  static GType gst_voamrwbenc_bandmode_type = 0;
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  static const GEnumValue gst_voamrwbenc_bandmode[] = {
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    {MR660, "MR660", "MR660"},
    {MR885, "MR885", "MR885"},
    {MR1265, "MR1265", "MR1265"},
    {MR1425, "MR1425", "MR1425"},
    {MR1585, "MR1585", "MR1585"},
    {MR1825, "MR1825", "MR1825"},
    {MR1985, "MR1985", "MR1985"},
    {MR2305, "MR2305", "MR2305"},
    {MR2385, "MR2385", "MR2385"},
    {MRDTX, "MRDTX", "MRDTX"},
    {0, NULL, NULL},
  };
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  if (!gst_voamrwbenc_bandmode_type) {
    gst_voamrwbenc_bandmode_type =
        g_enum_register_static ("GstVoAmrWbEncBandMode",
        gst_voamrwbenc_bandmode);
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  }
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  return gst_voamrwbenc_bandmode_type;
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}

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#define GST_VOAMRWBENC_BANDMODE_TYPE (gst_voamrwbenc_bandmode_get_type())
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#define BANDMODE_DEFAULT MR660

enum
{
  PROP_0,
  PROP_BANDMODE
};

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static GstStaticPadTemplate sink_template = GST_STATIC_PAD_TEMPLATE ("sink",
    GST_PAD_SINK,
    GST_PAD_ALWAYS,
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    GST_STATIC_CAPS ("audio/x-raw, "
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        "format = (string) " GST_AUDIO_NE (S16) ", "
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        "layout = (string) interleaved, "
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        "rate = (int) 16000, " "channels = (int) 1")
    );

static GstStaticPadTemplate src_template = GST_STATIC_PAD_TEMPLATE ("src",
    GST_PAD_SRC,
    GST_PAD_ALWAYS,
    GST_STATIC_CAPS ("audio/AMR-WB, "
        "rate = (int) 16000, " "channels = (int) 1")
    );

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GST_DEBUG_CATEGORY_STATIC (gst_voamrwbenc_debug);
#define GST_CAT_DEFAULT gst_voamrwbenc_debug
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static gboolean gst_voamrwbenc_start (GstAudioEncoder * enc);
static gboolean gst_voamrwbenc_stop (GstAudioEncoder * enc);
static gboolean gst_voamrwbenc_set_format (GstAudioEncoder * enc,
    GstAudioInfo * info);
static GstFlowReturn gst_voamrwbenc_handle_frame (GstAudioEncoder * enc,
    GstBuffer * in_buf);
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G_DEFINE_TYPE (GstVoAmrWbEnc, gst_voamrwbenc, GST_TYPE_AUDIO_ENCODER);
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static void
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gst_voamrwbenc_set_property (GObject * object, guint prop_id,
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    const GValue * value, GParamSpec * pspec)
{
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  GstVoAmrWbEnc *self = GST_VOAMRWBENC (object);
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  switch (prop_id) {
    case PROP_BANDMODE:
      self->bandmode = g_value_get_enum (value);
      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      break;
  }

  return;
}

static void
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gst_voamrwbenc_get_property (GObject * object, guint prop_id,
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    GValue * value, GParamSpec * pspec)
{
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  GstVoAmrWbEnc *self = GST_VOAMRWBENC (object);
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  switch (prop_id) {
    case PROP_BANDMODE:
      g_value_set_enum (value, self->bandmode);
      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      break;
  }

  return;
}

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static void
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gst_voamrwbenc_class_init (GstVoAmrWbEncClass * klass)
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{
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  GObjectClass *object_class = G_OBJECT_CLASS (klass);
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  GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
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  GstAudioEncoderClass *base_class = GST_AUDIO_ENCODER_CLASS (klass);

  object_class->set_property = gst_voamrwbenc_set_property;
  object_class->get_property = gst_voamrwbenc_get_property;
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  gst_element_class_add_static_pad_template (element_class, &sink_template);
  gst_element_class_add_static_pad_template (element_class, &src_template);
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  gst_element_class_set_static_metadata (element_class, "AMR-WB audio encoder",
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      "Codec/Encoder/Audio",
      "Adaptive Multi-Rate Wideband audio encoder",
      "Renato Araujo <renato.filho@indt.org.br>");
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  base_class->start = GST_DEBUG_FUNCPTR (gst_voamrwbenc_start);
  base_class->stop = GST_DEBUG_FUNCPTR (gst_voamrwbenc_stop);
  base_class->set_format = GST_DEBUG_FUNCPTR (gst_voamrwbenc_set_format);
  base_class->handle_frame = GST_DEBUG_FUNCPTR (gst_voamrwbenc_handle_frame);

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  g_object_class_install_property (object_class, PROP_BANDMODE,
      g_param_spec_enum ("band-mode", "Band Mode",
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          "Encoding Band Mode (Kbps)", GST_VOAMRWBENC_BANDMODE_TYPE,
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          BANDMODE_DEFAULT,
          G_PARAM_READWRITE | G_PARAM_CONSTRUCT | G_PARAM_STATIC_STRINGS));
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  GST_DEBUG_CATEGORY_INIT (gst_voamrwbenc_debug, "voamrwbenc", 0,
      "voamrwb encoder");
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}

static void
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gst_voamrwbenc_init (GstVoAmrWbEnc * amrwbenc)
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{
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  GST_PAD_SET_ACCEPT_TEMPLATE (GST_AUDIO_ENCODER_SINK_PAD (amrwbenc));

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  /* init rest */
  amrwbenc->handle = NULL;
  amrwbenc->channels = 0;
  amrwbenc->rate = 0;
}

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static gboolean
gst_voamrwbenc_start (GstAudioEncoder * enc)
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{
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  GstVoAmrWbEnc *voamrwbenc = GST_VOAMRWBENC (enc);

  GST_DEBUG_OBJECT (enc, "start");
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  if (!(voamrwbenc->handle = E_IF_init ()))
    return FALSE;
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  voamrwbenc->rate = 0;
  voamrwbenc->channels = 0;
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  return TRUE;
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}

static gboolean
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gst_voamrwbenc_stop (GstAudioEncoder * enc)
{
  GstVoAmrWbEnc *voamrwbenc = GST_VOAMRWBENC (enc);

  GST_DEBUG_OBJECT (enc, "stop");

  if (voamrwbenc->handle) {
    E_IF_exit (voamrwbenc->handle);
    voamrwbenc->handle = NULL;
  }

  return TRUE;
}

static gboolean
gst_voamrwbenc_set_format (GstAudioEncoder * benc, GstAudioInfo * info)
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{
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  GstVoAmrWbEnc *amrwbenc;
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  GstCaps *copy;

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  amrwbenc = GST_VOAMRWBENC (benc);
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  /* get channel count */
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  amrwbenc->channels = GST_AUDIO_INFO_CHANNELS (info);
  amrwbenc->rate = GST_AUDIO_INFO_RATE (info);
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  /* this is not wrong but will sound bad */
  if (amrwbenc->channels != 1) {
    GST_WARNING ("amrwbdec is only optimized for mono channels");
  }
  if (amrwbenc->rate != 16000) {
    GST_WARNING ("amrwbdec is only optimized for 16000 Hz samplerate");
  }

  /* create reverse caps */
  copy = gst_caps_new_simple ("audio/AMR-WB",
      "channels", G_TYPE_INT, amrwbenc->channels,
      "rate", G_TYPE_INT, amrwbenc->rate, NULL);

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  gst_audio_encoder_set_output_format (GST_AUDIO_ENCODER (amrwbenc), copy);
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  gst_caps_unref (copy);

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  /* report needs to base class: one frame at a time */
  gst_audio_encoder_set_frame_samples_min (benc, L_FRAME16k);
  gst_audio_encoder_set_frame_samples_max (benc, L_FRAME16k);
  gst_audio_encoder_set_frame_max (benc, 1);

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  return TRUE;
}

static GstFlowReturn
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gst_voamrwbenc_handle_frame (GstAudioEncoder * benc, GstBuffer * buffer)
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{
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  GstVoAmrWbEnc *amrwbenc;
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  GstFlowReturn ret = GST_FLOW_OK;
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  const int buffer_size = sizeof (short) * L_FRAME16k;
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  GstBuffer *out;
  gint outsize;
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  GstMapInfo map, omap;
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  amrwbenc = GST_VOAMRWBENC (benc);
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  g_return_val_if_fail (amrwbenc->handle, GST_FLOW_NOT_NEGOTIATED);
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  /* we don't deal with squeezing remnants, so simply discard those */
  if (G_UNLIKELY (buffer == NULL)) {
    GST_DEBUG_OBJECT (amrwbenc, "no data");
    goto done;
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  }

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  gst_buffer_map (buffer, &map, GST_MAP_READ);
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  if (G_UNLIKELY (map.size < buffer_size)) {
    GST_DEBUG_OBJECT (amrwbenc, "discarding trailing data %d", (gint) map.size);
    gst_buffer_unmap (buffer, &map);
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    ret = gst_audio_encoder_finish_frame (benc, NULL, -1);
    goto done;
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  }

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  out = gst_buffer_new_and_alloc (buffer_size);
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  gst_buffer_map (out, &omap, GST_MAP_WRITE);
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  /* encode */
  outsize = E_IF_encode (amrwbenc->handle, amrwbenc->bandmode,
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      (const short *) map.data, (unsigned char *) omap.data, 0);
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  GST_LOG_OBJECT (amrwbenc, "encoded to %d bytes", outsize);
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  gst_buffer_unmap (out, &omap);
  gst_buffer_unmap (buffer, &map);
  gst_buffer_resize (out, 0, outsize);
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  ret = gst_audio_encoder_finish_frame (benc, out, L_FRAME16k);
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done:
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  return ret;
}