/* * Siren Encoder Gst Element * * @author: Youness Alaoui * * 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 * Free Software Foundation, Inc., 59 Temple Place - Suite 330, * Boston, MA 02111-1307, USA. * */ /** * SECTION:element-sirenenc * * This encodes audio buffers into the Siren 16 codec (a 16khz extension of * G.722.1) that is meant to be compatible with the Microsoft Windows Live * Messenger(tm) implementation. * * Ref: http://www.polycom.com/company/about_us/technology/siren_g7221/index.html */ #ifdef HAVE_CONFIG_H #include "config.h" #endif #include "gstsirenenc.h" #include GST_DEBUG_CATEGORY (sirenenc_debug); #define GST_CAT_DEFAULT (sirenenc_debug) #define FRAME_DURATION (20 * GST_MSECOND) static GstStaticPadTemplate srctemplate = GST_STATIC_PAD_TEMPLATE ("src", GST_PAD_SRC, GST_PAD_ALWAYS, GST_STATIC_CAPS ("audio/x-siren, " "dct-length = (int) 320")); static GstStaticPadTemplate sinktemplate = GST_STATIC_PAD_TEMPLATE ("sink", GST_PAD_SINK, GST_PAD_ALWAYS, GST_STATIC_CAPS ("audio/x-raw, format = (string) \"S16LE\", " "rate = (int) 16000, " "channels = (int) 1")); static gboolean gst_siren_enc_start (GstAudioEncoder * enc); static gboolean gst_siren_enc_stop (GstAudioEncoder * enc); static gboolean gst_siren_enc_set_format (GstAudioEncoder * enc, GstAudioInfo * info); static GstFlowReturn gst_siren_enc_handle_frame (GstAudioEncoder * enc, GstBuffer * in_buf); G_DEFINE_TYPE (GstSirenEnc, gst_siren_enc, GST_TYPE_AUDIO_ENCODER); static void gst_siren_enc_class_init (GstSirenEncClass * klass) { GstElementClass *element_class = GST_ELEMENT_CLASS (klass); GstAudioEncoderClass *base_class = GST_AUDIO_ENCODER_CLASS (klass); GST_DEBUG_CATEGORY_INIT (sirenenc_debug, "sirenenc", 0, "sirenenc"); gst_element_class_add_pad_template (element_class, gst_static_pad_template_get (&srctemplate)); gst_element_class_add_pad_template (element_class, gst_static_pad_template_get (&sinktemplate)); gst_element_class_set_static_metadata (element_class, "Siren Encoder element", "Codec/Encoder/Audio ", "Encode 16bit PCM streams into the Siren7 codec", "Youness Alaoui "); base_class->start = GST_DEBUG_FUNCPTR (gst_siren_enc_start); base_class->stop = GST_DEBUG_FUNCPTR (gst_siren_enc_stop); base_class->set_format = GST_DEBUG_FUNCPTR (gst_siren_enc_set_format); base_class->handle_frame = GST_DEBUG_FUNCPTR (gst_siren_enc_handle_frame); GST_DEBUG ("Class Init done"); } static void gst_siren_enc_init (GstSirenEnc * enc) { } static gboolean gst_siren_enc_start (GstAudioEncoder * enc) { GstSirenEnc *senc = GST_SIREN_ENC (enc); GST_DEBUG_OBJECT (enc, "start"); senc->encoder = Siren7_NewEncoder (16000); return TRUE; } static gboolean gst_siren_enc_stop (GstAudioEncoder * enc) { GstSirenEnc *senc = GST_SIREN_ENC (enc); GST_DEBUG_OBJECT (senc, "stop"); Siren7_CloseEncoder (senc->encoder); return TRUE; } static gboolean gst_siren_enc_set_format (GstAudioEncoder * benc, GstAudioInfo * info) { gboolean res; GstCaps *outcaps; outcaps = gst_static_pad_template_get_caps (&srctemplate); res = gst_audio_encoder_set_output_format (benc, outcaps); gst_caps_unref (outcaps); /* report needs to base class */ gst_audio_encoder_set_frame_samples_min (benc, 320); gst_audio_encoder_set_frame_samples_max (benc, 320); /* no remainder or flushing please */ gst_audio_encoder_set_hard_min (benc, TRUE); gst_audio_encoder_set_drainable (benc, FALSE); return res; } static GstFlowReturn gst_siren_enc_handle_frame (GstAudioEncoder * benc, GstBuffer * buf) { GstSirenEnc *enc; GstFlowReturn ret = GST_FLOW_OK; GstBuffer *out_buf; guint8 *in_data, *out_data; guint i, size, num_frames; gint out_size, in_size; gint encode_ret; GstMapInfo inmap, outmap; g_return_val_if_fail (buf != NULL, GST_FLOW_ERROR); enc = GST_SIREN_ENC (benc); size = gst_buffer_get_size (buf); GST_LOG_OBJECT (enc, "Received buffer of size %d", size); g_return_val_if_fail (size > 0, GST_FLOW_ERROR); g_return_val_if_fail (size % 640 == 0, GST_FLOW_ERROR); /* we need to process 640 input bytes to produce 40 output bytes */ /* calculate the amount of frames we will handle */ num_frames = size / 640; /* this is the input/output size */ in_size = num_frames * 640; out_size = num_frames * 40; GST_LOG_OBJECT (enc, "we have %u frames, %u in, %u out", num_frames, in_size, out_size); /* get a buffer */ out_buf = gst_audio_encoder_allocate_output_buffer (benc, out_size); if (out_buf == NULL) goto alloc_failed; /* get the input data for all the frames */ gst_buffer_map (buf, &inmap, GST_MAP_READ); gst_buffer_map (out_buf, &outmap, GST_MAP_READ); in_data = inmap.data; out_data = outmap.data; for (i = 0; i < num_frames; i++) { GST_LOG_OBJECT (enc, "Encoding frame %u/%u", i, num_frames); /* encode 640 input bytes to 40 output bytes */ encode_ret = Siren7_EncodeFrame (enc->encoder, in_data, out_data); if (encode_ret != 0) goto encode_error; /* move to next frame */ out_data += 40; in_data += 640; } gst_buffer_unmap (buf, &inmap); gst_buffer_unmap (out_buf, &outmap); GST_LOG_OBJECT (enc, "Finished encoding"); /* we encode all we get, pass it along */ ret = gst_audio_encoder_finish_frame (benc, out_buf, -1); done: return ret; /* ERRORS */ alloc_failed: { GST_DEBUG_OBJECT (enc, "failed to pad_alloc buffer: %d (%s)", ret, gst_flow_get_name (ret)); goto done; } encode_error: { GST_ELEMENT_ERROR (enc, STREAM, ENCODE, (NULL), ("Error encoding frame: %d", encode_ret)); ret = GST_FLOW_ERROR; gst_buffer_unref (out_buf); goto done; } } gboolean gst_siren_enc_plugin_init (GstPlugin * plugin) { return gst_element_register (plugin, "sirenenc", GST_RANK_MARGINAL, GST_TYPE_SIREN_ENC); }