169 lines
4.9 KiB
C
169 lines
4.9 KiB
C
/*
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing,
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* software distributed under the License is distributed on an
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* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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* KIND, either express or implied. See the License for the
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* specific language governing permissions and limitations
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* under the License.
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*/
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#include "config.h"
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#include "audio_input.h"
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#include "ptr_string.h"
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#include "rdp.h"
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#include <freerdp/freerdp.h>
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#include <freerdp/channels/channels.h>
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#include <guacamole/protocol.h>
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#include <guacamole/socket.h>
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#include <guacamole/stream.h>
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#include <guacamole/user.h>
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#include <stdlib.h>
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int guac_rdp_audio_handler(guac_user* user, guac_stream* stream,
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char* mimetype) {
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/* FIXME: Assuming mimetype of "audio/L16;rate=44100,channels=2" */
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/* Init stream data */
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stream->blob_handler = guac_rdp_audio_blob_handler;
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stream->end_handler = guac_rdp_audio_end_handler;
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guac_protocol_send_ack(user->socket, stream,
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"OK", GUAC_PROTOCOL_STATUS_SUCCESS);
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guac_socket_flush(user->socket);
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return 0;
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}
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int guac_rdp_audio_blob_handler(guac_user* user, guac_stream* stream,
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void* data, int length) {
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guac_client* client = user->client;
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guac_rdp_client* rdp_client = (guac_rdp_client*) client->data;
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/* Write blob to audio stream, buffering if necessary */
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guac_rdp_audio_buffer_write(rdp_client->audio_input, data, length);
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return 0;
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}
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int guac_rdp_audio_end_handler(guac_user* user, guac_stream* stream) {
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/* Ignore - the AUDIO_INPUT channel will simply not receive anything */
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return 0;
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}
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void guac_rdp_audio_load_plugin(rdpContext* context) {
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guac_client* client = ((rdp_freerdp_context*) context)->client;
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/* Add "AUDIO_INPUT" channel */
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ADDIN_ARGV* args = malloc(sizeof(ADDIN_ARGV));
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args->argc = 2;
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args->argv = malloc(sizeof(char**) * 2);
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args->argv[0] = strdup("guacai");
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args->argv[1] = guac_rdp_ptr_to_string(client);
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freerdp_dynamic_channel_collection_add(context->settings, args);
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}
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guac_rdp_audio_buffer* guac_rdp_audio_buffer_alloc() {
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return calloc(1, sizeof(guac_rdp_audio_buffer));
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}
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void guac_rdp_audio_buffer_begin(guac_rdp_audio_buffer* audio_buffer,
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int packet_size, guac_rdp_audio_buffer_flush_handler* flush_handler,
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void* data) {
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/* Reset buffer state to provided values */
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audio_buffer->bytes_written = 0;
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audio_buffer->packet_size = packet_size;
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audio_buffer->flush_handler = flush_handler;
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audio_buffer->data = data;
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/* Allocate new buffer */
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free(audio_buffer->packet);
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audio_buffer->packet = malloc(packet_size);
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}
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void guac_rdp_audio_buffer_write(guac_rdp_audio_buffer* audio_buffer,
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char* buffer, int length) {
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/* Ignore packet if there is no buffer */
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if (audio_buffer->packet_size == 0 || audio_buffer->packet == NULL)
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return;
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/* Continuously write packets until no data remains */
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while (length > 0) {
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/* Calculate ideal size of chunk based on available space */
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int chunk_size = audio_buffer->packet_size
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- audio_buffer->bytes_written;
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/* Shrink chunk size if insufficient bytes are provided */
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if (length < chunk_size)
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chunk_size = length;
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/* Append buffer */
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memcpy(audio_buffer->packet + audio_buffer->bytes_written,
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buffer, chunk_size);
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/* Update byte counters */
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length -= chunk_size;
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audio_buffer->bytes_written += chunk_size;
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/* Advance to next chunk */
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buffer += chunk_size;
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/* Invoke flush handler if full */
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if (audio_buffer->bytes_written == audio_buffer->packet_size) {
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/* Only actually invoke if defined */
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if (audio_buffer->flush_handler)
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audio_buffer->flush_handler(audio_buffer->packet,
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audio_buffer->bytes_written, audio_buffer->data);
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/* Reset buffer in all cases */
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audio_buffer->bytes_written = 0;
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}
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} /* end packet write loop */
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}
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void guac_rdp_audio_buffer_end(guac_rdp_audio_buffer* audio_buffer) {
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/* Reset buffer state */
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audio_buffer->bytes_written = 0;
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audio_buffer->packet_size = 0;
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audio_buffer->flush_handler = NULL;
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/* Free packet (if any) */
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free(audio_buffer->packet);
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audio_buffer->packet = NULL;
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}
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void guac_rdp_audio_buffer_free(guac_rdp_audio_buffer* audio_buffer) {
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free(audio_buffer->packet);
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free(audio_buffer);
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}
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