Implement wav encoder.
This commit is contained in:
Michael Jumper
parent
ef0eace8c5
commit
c1a4951363
@ -45,24 +45,27 @@ freerdp_LTLIBRARIES = guac_rdpsnd.la
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libguac_client_rdp_la_SOURCES = \
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src/audio.c \
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src/client.c \
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src/rdp_bitmap.c \
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src/rdp_glyph.c \
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src/rdp_pointer.c \
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src/rdp_gdi.c \
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src/default_pointer.c \
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src/guac_handlers.c \
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src/ogg_encoder.c \
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src/rdp_bitmap.c \
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src/rdp_cliprdr.c \
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src/rdp_keymap.c \
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src/rdp_gdi.c \
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src/rdp_glyph.c \
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src/rdp_keymap_base.c \
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src/rdp_keymap.c \
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src/rdp_keymap_en_us.c \
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src/default_pointer.c
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src/rdp_pointer.c \
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src/wav_encoder.c
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guac_rdpsnd_la_SOURCES = \
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src/audio.c \
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guac_rdpsnd/messages.c \
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guac_rdpsnd/service.c
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guac_rdpsnd/service.c \
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src/audio.c
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noinst_HEADERS = \
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guac_rdpsnd/messages.h \
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guac_rdpsnd/service.h \
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include/audio.h \
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include/client.h \
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include/default_pointer.h \
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@ -74,8 +77,7 @@ noinst_HEADERS = \
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include/rdp_glyph.h \
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include/rdp_keymap.h \
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include/rdp_pointer.h \
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guac_rdpsnd/messages.h \
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guac_rdpsnd/service.h
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include/wav_encoder.h
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libguac_client_rdp_la_LDFLAGS = -version-info 0:0:0
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guac_rdpsnd_la_LDFLAGS = -module -avoid-version -shared
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144
protocols/rdp/include/wav_encoder.h
Normal file
144
protocols/rdp/include/wav_encoder.h
Normal file
@ -0,0 +1,144 @@
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is libguac-client-rdp.
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*
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* The Initial Developer of the Original Code is
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* Michael Jumper.
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* Portions created by the Initial Developer are Copyright (C) 2010
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#ifndef __GUAC_WAV_ENCODER_H
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#define __GUAC_WAV_ENCODER_H
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#include "audio.h"
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typedef struct wav_encoder_riff_header {
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/**
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* The RIFF chunk header, normally the string "RIFF".
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*/
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unsigned char chunk_id[4];
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/**
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* Size of the entire file, not including chunk_id or chunk_size.
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*/
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unsigned char chunk_size[4];
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/**
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* The format of this file, normally the string "WAVE".
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*/
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unsigned char chunk_format[4];
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} wav_encoder_riff_header;
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typedef struct wav_encoder_fmt_header {
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/**
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* ID of this subchunk. For the fmt subchunk, this should be "fmt ".
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*/
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unsigned char subchunk_id[4];
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/**
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* The size of the rest of this subchunk. For PCM, this will be 16.
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*/
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unsigned char subchunk_size[4];
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/**
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* Format of this subchunk. For PCM, this will be 1.
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*/
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unsigned char subchunk_format[2];
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/**
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* The number of channels in the PCM data.
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*/
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unsigned char subchunk_channels[2];
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/**
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* The sample rate of the PCM data.
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*/
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unsigned char subchunk_sample_rate[4];
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/**
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* The sample rate of the PCM data in bytes per second.
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*/
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unsigned char subchunk_byte_rate[4];
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/**
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* The number of bytes per sample.
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*/
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unsigned char subchunk_block_align[2];
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/**
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* The number of bits per sample.
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*/
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unsigned char subchunk_bps[2];
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} wav_encoder_fmt_header;
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typedef struct wav_encoder_state {
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/**
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* Arbitrary PCM data available for writing when the overall WAV is
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* flushed.
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*/
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unsigned char* data_buffer;
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/**
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* The number of bytes currently present in the data buffer.
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*/
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int used;
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/**
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* The total number of bytes that can be written into the data buffer
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* without requiring resizing.
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*/
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int length;
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} wav_encoder_state;
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typedef struct wav_encoder_data_header {
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/**
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* ID of this subchunk. For the data subchunk, this should be "data".
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*/
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unsigned char subchunk_id[4];
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/**
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* The number of bytes in the PCM data.
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*/
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unsigned char subchunk_size[4];
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} wav_encoder_data_header;
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extern audio_encoder* wav_encoder;
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#endif
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201
protocols/rdp/src/wav_encoder.c
Normal file
201
protocols/rdp/src/wav_encoder.c
Normal file
@ -0,0 +1,201 @@
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is libguac-client-rdp.
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*
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* The Initial Developer of the Original Code is
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* Michael Jumper.
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* Portions created by the Initial Developer are Copyright (C) 2010
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#define WAV_BUFFER_SIZE 0x4000
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#include <stdlib.h>
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#include <string.h>
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#include <guacamole/client.h>
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#include <guacamole/protocol.h>
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#include "audio.h"
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#include "wav_encoder.h"
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void wav_encoder_begin_handler(audio_stream* audio) {
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/* Allocate stream state */
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wav_encoder_state* state = (wav_encoder_state*)
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malloc(sizeof(wav_encoder_state));
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/* Initialize buffer */
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state->length = WAV_BUFFER_SIZE;
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state->used = 0;
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state->data_buffer = (unsigned char*) malloc(state->length);
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audio->data = state;
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}
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void _wav_encoder_write_le(unsigned char* buffer, int value, int length) {
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int offset;
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/* Write all bytes in the given value in little-endian byte order */
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for (offset=0; offset<length; offset++) {
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/* Store byte */
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*buffer = value & 0xFF;
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/* Move to next byte */
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value >>= 8;
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buffer++;
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}
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}
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void wav_encoder_end_handler(audio_stream* audio) {
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/*
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* Static header init
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*/
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wav_encoder_riff_header riff_header = {
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.chunk_id = "RIFF",
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.chunk_format = "WAVE"
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};
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wav_encoder_fmt_header fmt_header = {
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.subchunk_id = "fmt ",
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.subchunk_size = {0x10, 0x00, 0x00, 0x00}, /* 16 */
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.subchunk_format = {0x01, 0x00} /* 1 = PCM */
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};
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wav_encoder_data_header data_header = {
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.subchunk_id = "data"
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};
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/* Get state */
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wav_encoder_state* state = (wav_encoder_state*) audio->data;
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/*
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* RIFF HEADER
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*/
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/* Chunk size */
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_wav_encoder_write_le(riff_header.chunk_size,
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4 + sizeof(fmt_header) + sizeof(data_header) + state->used,
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sizeof(riff_header.chunk_size));
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audio_stream_write_encoded(audio,
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(unsigned char*) &riff_header,
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sizeof(riff_header));
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/*
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* FMT HEADER
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*/
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/* Channels */
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_wav_encoder_write_le(fmt_header.subchunk_channels,
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audio->channels, sizeof(fmt_header.subchunk_channels));
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/* Sample rate */
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_wav_encoder_write_le(fmt_header.subchunk_sample_rate,
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audio->rate, sizeof(fmt_header.subchunk_sample_rate));
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/* Byte rate */
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_wav_encoder_write_le(fmt_header.subchunk_byte_rate,
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audio->rate * audio->channels * audio->bps / 8,
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sizeof(fmt_header.subchunk_byte_rate));
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/* Block align */
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_wav_encoder_write_le(fmt_header.subchunk_block_align,
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audio->channels * audio->bps / 8,
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sizeof(fmt_header.subchunk_block_align));
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/* Bits per second */
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_wav_encoder_write_le(fmt_header.subchunk_bps,
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audio->bps, sizeof(fmt_header.subchunk_bps));
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audio_stream_write_encoded(audio,
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(unsigned char*) &fmt_header,
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sizeof(fmt_header));
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/*
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* DATA HEADER
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*/
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/* PCM data size */
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_wav_encoder_write_le(data_header.subchunk_size,
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state->used, sizeof(data_header.subchunk_size));
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audio_stream_write_encoded(audio,
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(unsigned char*) &data_header,
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sizeof(data_header));
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/* Write .wav data */
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audio_stream_write_encoded(audio, state->data_buffer, state->used);
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/* Free stream state */
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free(state);
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}
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void wav_encoder_write_handler(audio_stream* audio,
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unsigned char* pcm_data, int length) {
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/* Get state */
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wav_encoder_state* state = (wav_encoder_state*) audio->data;
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/* Increase size of buffer if necessary */
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if (state->used + length > state->length) {
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/* Increase to double concatenated size to accomodate */
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state->length = (state->length + length)*2;
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state->data_buffer = realloc(state->data_buffer,
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state->length);
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}
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/* Append to buffer */
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memcpy(&(state->data_buffer[state->used]), pcm_data, length);
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state->used += length;
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}
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/* Encoder handlers */
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audio_encoder _wav_encoder = {
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.mimetype = "audio/wav",
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.begin_handler = wav_encoder_begin_handler,
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.write_handler = wav_encoder_write_handler,
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.end_handler = wav_encoder_end_handler
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};
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/* Actual encoder */
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audio_encoder* wav_encoder = &_wav_encoder;
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