| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| |
| #include "config.h" |
| |
| #include "raw_encoder.h" |
| |
| #include <guacamole/audio.h> |
| #include <guacamole/client.h> |
| #include <guacamole/protocol.h> |
| #include <guacamole/stream.h> |
| #include <guacamole/user.h> |
| |
| #include <stdlib.h> |
| #include <string.h> |
| |
| /** |
| * Sets the encoder associated with the given guac_audio_stream, automatically |
| * invoking its begin_handler. The guac_audio_stream MUST NOT already be |
| * associated with an encoder. |
| * |
| * @param audio |
| * The guac_audio_stream whose encoder is being set. |
| * |
| * @param encoder |
| * The encoder to associate with the given guac_audio_stream. |
| */ |
| static void guac_audio_stream_set_encoder(guac_audio_stream* audio, |
| guac_audio_encoder* encoder) { |
| |
| /* Call handler, if defined */ |
| if (encoder != NULL && encoder->begin_handler) |
| encoder->begin_handler(audio); |
| |
| /* Assign encoder, which may be NULL */ |
| audio->encoder = encoder; |
| |
| } |
| |
| /** |
| * Assigns a new audio encoder to the given guac_audio_stream based on the |
| * audio mimetypes declared as supported by the given user. If no audio encoder |
| * can be found, no new audio encoder is assigned, and the existing encoder is |
| * left untouched (if any). |
| * |
| * @param user |
| * The user whose supported audio mimetypes should determine the audio |
| * encoder selected. |
| * |
| * @param data |
| * The guac_audio_stream to which the new encoder should be assigned. |
| * Existing properties set on this audio stream, such as the bits per |
| * sample, may affect the encoder chosen. |
| * |
| * @return |
| * The assigned audio encoder. If no new audio encoder can be assigned, |
| * this will be the currently-assigned audio encoder (which may be NULL). |
| */ |
| static void* guac_audio_assign_encoder(guac_user* user, void* data) { |
| |
| int i; |
| |
| guac_audio_stream* audio = (guac_audio_stream*) data; |
| int bps = audio->bps; |
| |
| /* If no user is provided, or an encoder has already been assigned, |
| * do not attempt to assign a new encoder */ |
| if (user == NULL || audio->encoder != NULL) |
| return audio->encoder; |
| |
| /* For each supported mimetype, check for an associated encoder */ |
| for (i=0; user->info.audio_mimetypes[i] != NULL; i++) { |
| |
| const char* mimetype = user->info.audio_mimetypes[i]; |
| |
| /* If 16-bit raw audio is supported, done. */ |
| if (bps == 16 && strcmp(mimetype, raw16_encoder->mimetype) == 0) { |
| guac_audio_stream_set_encoder(audio, raw16_encoder); |
| break; |
| } |
| |
| /* If 8-bit raw audio is supported, done. */ |
| if (bps == 8 && strcmp(mimetype, raw8_encoder->mimetype) == 0) { |
| guac_audio_stream_set_encoder(audio, raw8_encoder); |
| break; |
| } |
| |
| } /* end for each mimetype */ |
| |
| /* Return assigned encoder, if any */ |
| return audio->encoder; |
| |
| } |
| |
| guac_audio_stream* guac_audio_stream_alloc(guac_client* client, |
| guac_audio_encoder* encoder, int rate, int channels, int bps) { |
| |
| guac_audio_stream* audio; |
| |
| /* Allocate stream */ |
| audio = (guac_audio_stream*) calloc(1, sizeof(guac_audio_stream)); |
| audio->client = client; |
| audio->stream = guac_client_alloc_stream(client); |
| |
| /* Load PCM properties */ |
| audio->rate = rate; |
| audio->channels = channels; |
| audio->bps = bps; |
| |
| /* Assign encoder if explicitly provided */ |
| if (encoder != NULL) |
| guac_audio_stream_set_encoder(audio, encoder); |
| |
| /* Otherwise, attempt to automatically assign encoder for owner */ |
| if (audio->encoder == NULL) |
| guac_client_for_owner(client, guac_audio_assign_encoder, audio); |
| |
| /* Failing that, attempt to assign encoder for ANY connected user */ |
| if (audio->encoder == NULL) |
| guac_client_foreach_user(client, guac_audio_assign_encoder, audio); |
| |
| return audio; |
| |
| } |
| |
| void guac_audio_stream_reset(guac_audio_stream* audio, |
| guac_audio_encoder* encoder, int rate, int channels, int bps) { |
| |
| /* Pull assigned encoder if no other encoder is requested */ |
| if (encoder == NULL) |
| encoder = audio->encoder; |
| |
| /* Do nothing if nothing is changing */ |
| if (encoder == audio->encoder |
| && rate == audio->rate |
| && channels == audio->channels |
| && bps == audio->bps) { |
| return; |
| } |
| |
| /* Free old encoder data */ |
| if (audio->encoder != NULL && audio->encoder->end_handler) |
| audio->encoder->end_handler(audio); |
| |
| /* Set PCM properties */ |
| audio->rate = rate; |
| audio->channels = channels; |
| audio->bps = bps; |
| |
| /* Re-init encoder */ |
| guac_audio_stream_set_encoder(audio, encoder); |
| |
| } |
| |
| void guac_audio_stream_add_user(guac_audio_stream* audio, guac_user* user) { |
| |
| /* Attempt to assign encoder if no encoder has yet been assigned */ |
| if (audio->encoder == NULL) |
| guac_audio_assign_encoder(user, audio); |
| |
| /* Notify encoder that a new user is present */ |
| if (audio->encoder != NULL && audio->encoder->join_handler) |
| audio->encoder->join_handler(audio, user); |
| |
| } |
| |
| void guac_audio_stream_free(guac_audio_stream* audio) { |
| |
| /* Flush stream encoding */ |
| guac_audio_stream_flush(audio); |
| |
| /* Clean up encoder */ |
| if (audio->encoder != NULL && audio->encoder->end_handler) |
| audio->encoder->end_handler(audio); |
| |
| /* Free associated data */ |
| free(audio); |
| |
| } |
| |
| void guac_audio_stream_write_pcm(guac_audio_stream* audio, |
| const unsigned char* data, int length) { |
| |
| /* Write data */ |
| if (audio->encoder != NULL && audio->encoder->write_handler) |
| audio->encoder->write_handler(audio, data, length); |
| |
| } |
| |
| void guac_audio_stream_flush(guac_audio_stream* audio) { |
| |
| /* Flush any buffered data */ |
| if (audio->encoder != NULL && audio->encoder->flush_handler) |
| audio->encoder->flush_handler(audio); |
| |
| } |
| |