maride/guacamole-spice-protocol
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

Initial support for audio in libguac.

Browse Source
This commit is contained in:
Michael Jumper 2013-08-08 17:52:09 -07:00
parent 8e732ed2ab
commit 8bd70053be
7 changed files with 1021 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
src/libguac/Makefile.am
View File

@ -40,6 +40,7 @@ AM_CFLAGS = -Werror -Wall -pedantic -Iguacamole
libguacincdir = $(includedir)/guacamole
libguacinc_HEADERS = \
guacamole/audio.h \
guacamole/client.h \
guacamole/error.h \
guacamole/hash.h \
@ -55,9 +56,11 @@ libguacinc_HEADERS = \
noinst_HEADERS = \
client-handlers.h \
palette.h
palette.h \
wav_encoder.h
libguac_la_SOURCES = \
audio.c \
client.c \
client-handlers.c \
error.c \
@ -73,6 +76,12 @@ libguac_la_SOURCES = \
timestamp.c \
unicode.c
lib_LTLIBRARIES = libguac.la
libguac_la_LDFLAGS = -version-info 5:0:0 @PTHREAD_LIBS@ @CAIRO_LIBS@ @PNG_LIBS@ @DL_LIBS@
# Compile OGG support if available
if ENABLE_OGG
libguac_la_SOURCES += ogg_encoder.c
noinst_HEADERS += ogg_encoder.h
endif
lib_LTLIBRARIES = libguac.la
libguac_la_LDFLAGS = -version-info 5:0:0 @PTHREAD_LIBS@ @CAIRO_LIBS@ @PNG_LIBS@ @DL_LIBS@ @VORBIS_LIBS@

174
src/libguac/audio.c Normal file
View File

@ -0,0 +1,174 @@
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is libguac.
*
* The Initial Developer of the Original Code is
* Michael Jumper.
* Portions created by the Initial Developer are Copyright (C) 2010
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include <stdlib.h>
#include <string.h>
#include <pthread.h>
#include <guacamole/protocol.h>
#include <guacamole/client.h>
#include <guacamole/stream.h>
#include <guacamole/audio.h>
audio_stream* audio_stream_alloc(guac_client* client, audio_encoder* encoder) {
/* Allocate stream */
audio_stream* audio = (audio_stream*) malloc(sizeof(audio_stream));
audio->client = client;
/* Reset buffer stats */
audio->used = 0;
audio->length = 0x40000;
audio->encoded_data_used = 0;
audio->encoded_data_length = 0x40000;
/* Allocate buffers */
audio->pcm_data = malloc(audio->length);
audio->encoded_data = malloc(audio->encoded_data_length);
/* Assign encoder */
audio->encoder = encoder;
audio->stream = guac_client_alloc_stream(client);
/* Ensure socket within new stream is threadsafe */
guac_socket_require_threadsafe(audio->stream->socket);
return audio;
}
void audio_stream_begin(audio_stream* audio, int rate, int channels, int bps) {
/* Load PCM properties */
audio->rate = rate;
audio->channels = channels;
audio->bps = bps;
/* Reset write counter */
audio->pcm_bytes_written = 0;
/* Call handler */
audio->encoder->begin_handler(audio);
}
void audio_stream_end(audio_stream* audio) {
double duration;
/* Flush stream and finish encoding */
audio_stream_flush(audio);
audio->encoder->end_handler(audio);
/* Calculate duration of PCM data */
duration = ((double) (audio->pcm_bytes_written * 1000 * 8))
/ audio->rate / audio->channels / audio->bps;
/* Send audio */
guac_protocol_send_audio(audio->stream->socket,
0, audio->encoder->mimetype,
duration, audio->encoded_data, audio->encoded_data_used);
/* Clear data */
audio->encoded_data_used = 0;
}
void audio_stream_free(audio_stream* audio) {
free(audio->pcm_data);
free(audio);
}
void audio_stream_write_pcm(audio_stream* audio,
unsigned char* data, int length) {
/* Update counter */
audio->pcm_bytes_written += length;
/* Resize audio buffer if necessary */
if (length > audio->length) {
/* Resize to double provided length */
audio->length = length*2;
audio->pcm_data = realloc(audio->pcm_data, audio->length);
}
/* Flush if necessary */
if (audio->used + length > audio->length)
audio_stream_flush(audio);
/* Append to buffer */
memcpy(&(audio->pcm_data[audio->used]), data, length);
audio->used += length;
}
void audio_stream_flush(audio_stream* audio) {
/* If data in buffer */
if (audio->used != 0) {
/* Write data */
audio->encoder->write_handler(audio,
audio->pcm_data, audio->used);
/* Reset buffer */
audio->used = 0;
}
}
void audio_stream_write_encoded(audio_stream* audio,
unsigned char* data, int length) {
/* Resize audio buffer if necessary */
if (audio->encoded_data_used + length > audio->encoded_data_length) {
/* Increase to double concatenated size to accomodate */
audio->encoded_data_length = (audio->encoded_data_length + length)*2;
audio->encoded_data = realloc(audio->encoded_data,
audio->encoded_data_length);
}
/* Append to buffer */
memcpy(&(audio->encoded_data[audio->encoded_data_used]), data, length);
audio->encoded_data_used += length;
}

212
src/libguac/guacamole/audio.h Normal file
View File

@ -0,0 +1,212 @@
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is libguac.
*
* The Initial Developer of the Original Code is
* Michael Jumper.
* Portions created by the Initial Developer are Copyright (C) 2010
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#ifndef __GUAC_AUDIO_H
#define __GUAC_AUDIO_H
#include <guacamole/client.h>
#include <guacamole/stream.h>
typedef struct audio_stream audio_stream;
/**
* Handler which is called when the audio stream is opened.
*/
typedef void audio_encoder_begin_handler(audio_stream* audio);
/**
* Handler which is called when the audio stream is closed.
*/
typedef void audio_encoder_end_handler(audio_stream* audio);
/**
* Handler which is called when the audio stream is flushed.
*/
typedef void audio_encoder_write_handler(audio_stream* audio,
unsigned char* pcm_data, int length);
/**
* Arbitrary audio codec encoder.
*/
typedef struct audio_encoder {
/**
* The mimetype of the audio data encoded by this audio
* encoder.
*/
const char* mimetype;
/**
* Handler which will be called when the audio stream is opened.
*/
audio_encoder_begin_handler* begin_handler;
/**
* Handler which will be called when the audio stream is flushed.
*/
audio_encoder_write_handler* write_handler;
/**
* Handler which will be called when the audio stream is closed.
*/
audio_encoder_end_handler* end_handler;
} audio_encoder;
/**
* Basic audio stream. PCM data is added to the stream. When the stream is
* flushed, a write handler receives PCM data packets and, presumably, streams
* them to the guac_stream provided.
*/
struct audio_stream {
/**
* PCM data buffer, 16-bit samples, 2-channel, 44100 Hz.
*/
unsigned char* pcm_data;
/**
* Number of bytes in buffer.
*/
int used;
/**
* Maximum number of bytes in buffer.
*/
int length;
/**
* Encoded audio data buffer, as written by the encoder.
*/
unsigned char* encoded_data;
/**
* Number of bytes in the encoded data buffer.
*/
int encoded_data_used;
/**
* Maximum number of bytes in the encoded data buffer.
*/
int encoded_data_length;
/**
* Arbitrary codec encoder. When the PCM buffer is flushed, PCM data will
* be sent to this encoder.
*/
audio_encoder* encoder;
/**
* The client associated with this audio stream.
*/
guac_client* client;
/**
* The actual stream associated with this audio stream.
*/
guac_stream* stream;
/**
* The number of samples per second of PCM data sent to this stream.
*/
int rate;
/**
* The number of audio channels per sample of PCM data. Legal values are
* 1 or 2.
*/
int channels;
/**
* The number of bits per sample per channel for PCM data. Legal values are
* 8 or 16.
*/
int bps;
/**
* The number of PCM bytes written since the audio chunk began.
*/
int pcm_bytes_written;
/**
* Encoder-specific state data.
*/
void* data;
};
/**
* Allocates a new audio stream.
*/
audio_stream* audio_stream_alloc(guac_client* client,
audio_encoder* encoder);
/**
* Frees the given audio stream.
*/
void audio_stream_free(audio_stream* stream);
/**
* Begins a new audio stream.
*/
void audio_stream_begin(audio_stream* stream, int rate, int channels, int bps);
/**
* Ends the current audio stream.
*/
void audio_stream_end(audio_stream* stream);
/**
* Writes PCM data to the given audio stream.
*/
void audio_stream_write_pcm(audio_stream* stream,
unsigned char* data, int length);
/**
* Flushes the given audio stream.
*/
void audio_stream_flush(audio_stream* stream);
/**
* Appends arbitrarily-encoded data to the encoded_data buffer
* within the given audio stream.
*/
void audio_stream_write_encoded(audio_stream* audio,
unsigned char* data, int length);
#endif

211
src/libguac/ogg_encoder.c Normal file
View File

@ -0,0 +1,211 @@
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is libguac.
*
* The Initial Developer of the Original Code is
* Michael Jumper.
* Portions created by the Initial Developer are Copyright (C) 2010
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include <stdlib.h>
#include <guacamole/audio.h>
#include <guacamole/client.h>
#include <guacamole/protocol.h>
#include <vorbis/vorbisenc.h>
#include "ogg_encoder.h"
void ogg_encoder_begin_handler(audio_stream* audio) {
/* Allocate stream state */
ogg_encoder_state* state = (ogg_encoder_state*)
malloc(sizeof(ogg_encoder_state));
/* Init state */
vorbis_info_init(&(state->info));
vorbis_encode_init_vbr(&(state->info), audio->channels, audio->rate, 0.4);
vorbis_analysis_init(&(state->vorbis_state), &(state->info));
vorbis_block_init(&(state->vorbis_state), &(state->vorbis_block));
vorbis_comment_init(&(state->comment));
vorbis_comment_add_tag(&(state->comment), "ENCODER", "libguac-client-rdp");
ogg_stream_init(&(state->ogg_state), rand());
/* Write headers */
{
ogg_packet header;
ogg_packet header_comm;
ogg_packet header_code;
vorbis_analysis_headerout(
&(state->vorbis_state),
&(state->comment),
&header, &header_comm, &header_code);
ogg_stream_packetin(&(state->ogg_state), &header);
ogg_stream_packetin(&(state->ogg_state), &header_comm);
ogg_stream_packetin(&(state->ogg_state), &header_code);
/* For each packet */
while (ogg_stream_flush(&(state->ogg_state), &(state->ogg_page)) != 0) {
/* Write packet header */
audio_stream_write_encoded(audio,
state->ogg_page.header,
state->ogg_page.header_len);
/* Write packet body */
audio_stream_write_encoded(audio,
state->ogg_page.body,
state->ogg_page.body_len);
}
}
audio->data = state;
}
void ogg_encoder_write_blocks(audio_stream* audio) {
/* Get state */
ogg_encoder_state* state = (ogg_encoder_state*) audio->data;
while (vorbis_analysis_blockout(&(state->vorbis_state),
&(state->vorbis_block)) == 1) {
/* Analyze */
vorbis_analysis(&(state->vorbis_block), NULL);
vorbis_bitrate_addblock(&(state->vorbis_block));
/* Flush Ogg pages */
while (vorbis_bitrate_flushpacket(&(state->vorbis_state),
&(state->ogg_packet))) {
/* Weld packet into bitstream */
ogg_stream_packetin(&(state->ogg_state), &(state->ogg_packet));
/* Write out pages */
while (ogg_stream_pageout(&(state->ogg_state),
&(state->ogg_page)) != 0) {
/* Write packet header */
audio_stream_write_encoded(audio,
state->ogg_page.header,
state->ogg_page.header_len);
/* Write packet body */
audio_stream_write_encoded(audio,
state->ogg_page.body,
state->ogg_page.body_len);
if (ogg_page_eos(&(state->ogg_page)))
break;
}
}
}
}
void ogg_encoder_end_handler(audio_stream* audio) {
/* Get state */
ogg_encoder_state* state = (ogg_encoder_state*) audio->data;
/* Write end-of-stream */
vorbis_analysis_wrote(&(state->vorbis_state), 0);
ogg_encoder_write_blocks(audio);
/* Clean up encoder */
ogg_stream_clear(&(state->ogg_state));
vorbis_block_clear(&(state->vorbis_block));
vorbis_dsp_clear(&(state->vorbis_state));
vorbis_comment_clear(&(state->comment));
vorbis_info_clear(&(state->info));
/* Free stream state */
free(audio->data);
}
void ogg_encoder_write_handler(audio_stream* audio,
unsigned char* pcm_data, int length) {
/* Get state */
ogg_encoder_state* state = (ogg_encoder_state*) audio->data;
/* Calculate samples */
int samples = length / audio->channels * 8 / audio->bps;
int i;
/* Get buffer */
float** buffer = vorbis_analysis_buffer(&(state->vorbis_state), samples);
signed char* readbuffer = (signed char*) pcm_data;
for (i=0; i<samples; i++) {
/* FIXME: For now, assume 2 channels, 16-bit */
int left = ((readbuffer[i*4+1]<<8)|(0x00ff&(int)readbuffer[i*4]));
int right = ((readbuffer[i*4+3]<<8)|(0x00ff&(int)readbuffer[i*4+2]));
/* Store sample in buffer */
buffer[0][i] = left / 32768.f;
buffer[1][i] = right / 32768.f;
}
/* Submit data */
vorbis_analysis_wrote(&(state->vorbis_state), samples);
/* Write data */
ogg_encoder_write_blocks(audio);
}
/* Encoder handlers */
audio_encoder _ogg_encoder = {
.mimetype = "audio/ogg",
.begin_handler = ogg_encoder_begin_handler,
.write_handler = ogg_encoder_write_handler,
.end_handler = ogg_encoder_end_handler
};
/* Actual encoder */
audio_encoder* ogg_encoder = &_ogg_encoder;

67
src/libguac/ogg_encoder.h Normal file
View File

@ -0,0 +1,67 @@
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is libguac.
*
* The Initial Developer of the Original Code is
* Michael Jumper.
* Portions created by the Initial Developer are Copyright (C) 2010
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#ifndef __GUAC_OGG_ENCODER_H
#define __GUAC_OGG_ENCODER_H
#include <guacamole/audio.h>
#include <vorbis/vorbisenc.h>
typedef struct ogg_encoder_state {
/**
* Ogg state
*/
ogg_stream_state ogg_state;
ogg_page ogg_page;
ogg_packet ogg_packet;
/**
* Vorbis state
*/
vorbis_info info;
vorbis_comment comment;
vorbis_dsp_state vorbis_state;
vorbis_block vorbis_block;
} ogg_encoder_state;
extern audio_encoder* ogg_encoder;
#endif

201
src/libguac/wav_encoder.c Normal file
View File

@ -0,0 +1,201 @@
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is libguac.
*
* The Initial Developer of the Original Code is
* Michael Jumper.
* Portions created by the Initial Developer are Copyright (C) 2010
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#define WAV_BUFFER_SIZE 0x4000
#include <stdlib.h>
#include <string.h>
#include <guacamole/audio.h>
#include <guacamole/client.h>
#include <guacamole/protocol.h>
#include "wav_encoder.h"
void wav_encoder_begin_handler(audio_stream* audio) {
/* Allocate stream state */
wav_encoder_state* state = (wav_encoder_state*)
malloc(sizeof(wav_encoder_state));
/* Initialize buffer */
state->length = WAV_BUFFER_SIZE;
state->used = 0;
state->data_buffer = (unsigned char*) malloc(state->length);
audio->data = state;
}
void _wav_encoder_write_le(unsigned char* buffer, int value, int length) {
int offset;
/* Write all bytes in the given value in little-endian byte order */
for (offset=0; offset<length; offset++) {
/* Store byte */
*buffer = value & 0xFF;
/* Move to next byte */
value >>= 8;
buffer++;
}
}
void wav_encoder_end_handler(audio_stream* audio) {
/*
* Static header init
*/
wav_encoder_riff_header riff_header = {
.chunk_id = "RIFF",
.chunk_format = "WAVE"
};
wav_encoder_fmt_header fmt_header = {
.subchunk_id = "fmt ",
.subchunk_size = {0x10, 0x00, 0x00, 0x00}, /* 16 */
.subchunk_format = {0x01, 0x00} /* 1 = PCM */
};
wav_encoder_data_header data_header = {
.subchunk_id = "data"
};
/* Get state */
wav_encoder_state* state = (wav_encoder_state*) audio->data;
/*
* RIFF HEADER
*/
/* Chunk size */
_wav_encoder_write_le(riff_header.chunk_size,
4 + sizeof(fmt_header) + sizeof(data_header) + state->used,
sizeof(riff_header.chunk_size));
audio_stream_write_encoded(audio,
(unsigned char*) &riff_header,
sizeof(riff_header));
/*
* FMT HEADER
*/
/* Channels */
_wav_encoder_write_le(fmt_header.subchunk_channels,
audio->channels, sizeof(fmt_header.subchunk_channels));
/* Sample rate */
_wav_encoder_write_le(fmt_header.subchunk_sample_rate,
audio->rate, sizeof(fmt_header.subchunk_sample_rate));
/* Byte rate */
_wav_encoder_write_le(fmt_header.subchunk_byte_rate,
audio->rate * audio->channels * audio->bps / 8,
sizeof(fmt_header.subchunk_byte_rate));
/* Block align */
_wav_encoder_write_le(fmt_header.subchunk_block_align,
audio->channels * audio->bps / 8,
sizeof(fmt_header.subchunk_block_align));
/* Bits per second */
_wav_encoder_write_le(fmt_header.subchunk_bps,
audio->bps, sizeof(fmt_header.subchunk_bps));
audio_stream_write_encoded(audio,
(unsigned char*) &fmt_header,
sizeof(fmt_header));
/*
* DATA HEADER
*/
/* PCM data size */
_wav_encoder_write_le(data_header.subchunk_size,
state->used, sizeof(data_header.subchunk_size));
audio_stream_write_encoded(audio,
(unsigned char*) &data_header,
sizeof(data_header));
/* Write .wav data */
audio_stream_write_encoded(audio, state->data_buffer, state->used);
/* Free stream state */
free(state);
}
void wav_encoder_write_handler(audio_stream* audio,
unsigned char* pcm_data, int length) {
/* Get state */
wav_encoder_state* state = (wav_encoder_state*) audio->data;
/* Increase size of buffer if necessary */
if (state->used + length > state->length) {
/* Increase to double concatenated size to accomodate */
state->length = (state->length + length)*2;
state->data_buffer = realloc(state->data_buffer,
state->length);
}
/* Append to buffer */
memcpy(&(state->data_buffer[state->used]), pcm_data, length);
state->used += length;
}
/* Encoder handlers */
audio_encoder _wav_encoder = {
.mimetype = "audio/wav",
.begin_handler = wav_encoder_begin_handler,
.write_handler = wav_encoder_write_handler,
.end_handler = wav_encoder_end_handler
};
/* Actual encoder */
audio_encoder* wav_encoder = &_wav_encoder;

144
src/libguac/wav_encoder.h Normal file
View File

@ -0,0 +1,144 @@
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is libguac.
*
* The Initial Developer of the Original Code is
* Michael Jumper.
* Portions created by the Initial Developer are Copyright (C) 2010
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#ifndef __GUAC_WAV_ENCODER_H
#define __GUAC_WAV_ENCODER_H
#include <guacamole/audio.h>
typedef struct wav_encoder_riff_header {
/**
* The RIFF chunk header, normally the string "RIFF".
*/
unsigned char chunk_id[4];
/**
* Size of the entire file, not including chunk_id or chunk_size.
*/
unsigned char chunk_size[4];
/**
* The format of this file, normally the string "WAVE".
*/
unsigned char chunk_format[4];
} wav_encoder_riff_header;
typedef struct wav_encoder_fmt_header {
/**
* ID of this subchunk. For the fmt subchunk, this should be "fmt ".
*/
unsigned char subchunk_id[4];
/**
* The size of the rest of this subchunk. For PCM, this will be 16.
*/
unsigned char subchunk_size[4];
/**
* Format of this subchunk. For PCM, this will be 1.
*/
unsigned char subchunk_format[2];
/**
* The number of channels in the PCM data.
*/
unsigned char subchunk_channels[2];
/**
* The sample rate of the PCM data.
*/
unsigned char subchunk_sample_rate[4];
/**
* The sample rate of the PCM data in bytes per second.
*/
unsigned char subchunk_byte_rate[4];
/**
* The number of bytes per sample.
*/
unsigned char subchunk_block_align[2];
/**
* The number of bits per sample.
*/
unsigned char subchunk_bps[2];
} wav_encoder_fmt_header;
typedef struct wav_encoder_state {
/**
* Arbitrary PCM data available for writing when the overall WAV is
* flushed.
*/
unsigned char* data_buffer;
/**
* The number of bytes currently present in the data buffer.
*/
int used;
/**
* The total number of bytes that can be written into the data buffer
* without requiring resizing.
*/
int length;
} wav_encoder_state;
typedef struct wav_encoder_data_header {
/**
* ID of this subchunk. For the data subchunk, this should be "data".
*/
unsigned char subchunk_id[4];
/**
* The number of bytes in the PCM data.
*/
unsigned char subchunk_size[4];
} wav_encoder_data_header;
extern audio_encoder* wav_encoder;
#endif