| /* |
| * 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 "channels/rdpsnd/rdpsnd-messages.h" |
| #include "channels/rdpsnd/rdpsnd.h" |
| #include "rdp.h" |
| |
| #include <freerdp/codec/audio.h> |
| #include <guacamole/audio.h> |
| #include <guacamole/client.h> |
| #include <winpr/stream.h> |
| #include <winpr/wtypes.h> |
| |
| #include <stdlib.h> |
| #include <string.h> |
| |
| void guac_rdpsnd_formats_handler(guac_rdp_common_svc* svc, |
| wStream* input_stream, guac_rdpsnd_pdu_header* header) { |
| |
| int server_format_count; |
| int server_version; |
| int i; |
| |
| wStream* output_stream; |
| int output_body_size; |
| unsigned char* output_stream_end; |
| |
| guac_client* client = svc->client; |
| guac_rdpsnd* rdpsnd = (guac_rdpsnd*) svc->data; |
| |
| guac_rdp_client* rdp_client = (guac_rdp_client*) client->data; |
| guac_audio_stream* audio = rdp_client->audio; |
| |
| /* Reset own format count */ |
| rdpsnd->format_count = 0; |
| |
| /* Format header */ |
| Stream_Seek(input_stream, 14); |
| Stream_Read_UINT16(input_stream, server_format_count); |
| Stream_Seek_UINT8(input_stream); |
| Stream_Read_UINT16(input_stream, server_version); |
| Stream_Seek_UINT8(input_stream); |
| |
| /* Initialize Client Audio Formats and Version PDU */ |
| output_stream = Stream_New(NULL, 24); |
| Stream_Write_UINT8(output_stream, SNDC_FORMATS); |
| Stream_Write_UINT8(output_stream, 0); |
| |
| /* Fill in body size later */ |
| Stream_Seek_UINT16(output_stream); /* offset = 0x02 */ |
| |
| /* Flags, volume, and pitch */ |
| Stream_Write_UINT32(output_stream, TSSNDCAPS_ALIVE); |
| Stream_Write_UINT32(output_stream, 0); |
| Stream_Write_UINT32(output_stream, 0); |
| |
| /* Datagram port (UDP) */ |
| Stream_Write_UINT16(output_stream, 0); |
| |
| /* Fill in format count later */ |
| Stream_Seek_UINT16(output_stream); /* offset = 0x12 */ |
| |
| /* Version and padding */ |
| Stream_Write_UINT8(output_stream, 0); |
| Stream_Write_UINT16(output_stream, 6); |
| Stream_Write_UINT8(output_stream, 0); |
| |
| /* Check each server format, respond if supported and audio is enabled */ |
| if (audio != NULL) { |
| for (i=0; i < server_format_count; i++) { |
| |
| unsigned char* format_start; |
| |
| int format_tag; |
| int channels; |
| int rate; |
| int bps; |
| int body_size; |
| |
| /* Remember position in stream */ |
| Stream_GetPointer(input_stream, format_start); |
| |
| /* Read format */ |
| Stream_Read_UINT16(input_stream, format_tag); |
| Stream_Read_UINT16(input_stream, channels); |
| Stream_Read_UINT32(input_stream, rate); |
| Stream_Seek_UINT32(input_stream); |
| Stream_Seek_UINT16(input_stream); |
| Stream_Read_UINT16(input_stream, bps); |
| |
| /* Skip past extra data */ |
| Stream_Read_UINT16(input_stream, body_size); |
| Stream_Seek(input_stream, body_size); |
| |
| /* If PCM, accept */ |
| if (format_tag == WAVE_FORMAT_PCM) { |
| |
| /* If can fit another format, accept it */ |
| if (rdpsnd->format_count < GUAC_RDP_MAX_FORMATS) { |
| |
| /* Add channel */ |
| int current = rdpsnd->format_count++; |
| rdpsnd->formats[current].rate = rate; |
| rdpsnd->formats[current].channels = channels; |
| rdpsnd->formats[current].bps = bps; |
| |
| /* Log format */ |
| guac_client_log(client, GUAC_LOG_INFO, |
| "Accepted format: %i-bit PCM with %i channels at " |
| "%i Hz", |
| bps, channels, rate); |
| |
| /* Ensure audio stream is configured to use accepted |
| * format */ |
| guac_audio_stream_reset(audio, NULL, rate, channels, bps); |
| |
| /* Queue format for sending as accepted */ |
| Stream_EnsureRemainingCapacity(output_stream, |
| 18 + body_size); |
| Stream_Write(output_stream, format_start, 18 + body_size); |
| |
| /* |
| * BEWARE that using Stream_EnsureRemainingCapacity means |
| * that any pointers returned via Stream_GetPointer on |
| * output_stream are invalid. |
| */ |
| |
| } |
| |
| /* Otherwise, log that we dropped one */ |
| else |
| guac_client_log(client, GUAC_LOG_INFO, |
| "Dropped valid format: %i-bit PCM with %i " |
| "channels at %i Hz", |
| bps, channels, rate); |
| |
| } |
| |
| } |
| } |
| |
| /* Otherwise, ignore all supported formats as we do not intend to actually |
| * receive audio */ |
| else |
| guac_client_log(client, GUAC_LOG_DEBUG, |
| "Audio explicitly disabled. Ignoring supported formats."); |
| |
| /* Calculate size of PDU */ |
| output_body_size = Stream_GetPosition(output_stream) - 4; |
| Stream_GetPointer(output_stream, output_stream_end); |
| |
| /* Set body size */ |
| Stream_SetPosition(output_stream, 0x02); |
| Stream_Write_UINT16(output_stream, output_body_size); |
| |
| /* Set format count */ |
| Stream_SetPosition(output_stream, 0x12); |
| Stream_Write_UINT16(output_stream, rdpsnd->format_count); |
| |
| /* Reposition cursor at end (necessary for message send) */ |
| Stream_SetPointer(output_stream, output_stream_end); |
| |
| /* Send accepted formats */ |
| guac_rdp_common_svc_write(svc, output_stream); |
| |
| /* If version greater than 6, must send Quality Mode PDU */ |
| if (server_version >= 6) { |
| |
| /* Always send High Quality for now */ |
| output_stream = Stream_New(NULL, 8); |
| Stream_Write_UINT8(output_stream, SNDC_QUALITYMODE); |
| Stream_Write_UINT8(output_stream, 0); |
| Stream_Write_UINT16(output_stream, 4); |
| Stream_Write_UINT16(output_stream, HIGH_QUALITY); |
| Stream_Write_UINT16(output_stream, 0); |
| |
| guac_rdp_common_svc_write(svc, output_stream); |
| |
| } |
| |
| } |
| |
| /* server is getting a feel of the round trip time */ |
| void guac_rdpsnd_training_handler(guac_rdp_common_svc* svc, |
| wStream* input_stream, guac_rdpsnd_pdu_header* header) { |
| |
| int data_size; |
| wStream* output_stream; |
| |
| guac_rdpsnd* rdpsnd = (guac_rdpsnd*) svc->data; |
| |
| /* Read timestamp and data size */ |
| Stream_Read_UINT16(input_stream, rdpsnd->server_timestamp); |
| Stream_Read_UINT16(input_stream, data_size); |
| |
| /* Send training response */ |
| output_stream = Stream_New(NULL, 8); |
| Stream_Write_UINT8(output_stream, SNDC_TRAINING); |
| Stream_Write_UINT8(output_stream, 0); |
| Stream_Write_UINT16(output_stream, 4); |
| Stream_Write_UINT16(output_stream, rdpsnd->server_timestamp); |
| Stream_Write_UINT16(output_stream, data_size); |
| |
| guac_rdp_common_svc_write(svc, output_stream); |
| |
| } |
| |
| void guac_rdpsnd_wave_info_handler(guac_rdp_common_svc* svc, |
| wStream* input_stream, guac_rdpsnd_pdu_header* header) { |
| |
| int format; |
| |
| guac_client* client = svc->client; |
| guac_rdpsnd* rdpsnd = (guac_rdpsnd*) svc->data; |
| |
| guac_rdp_client* rdp_client = (guac_rdp_client*) client->data; |
| guac_audio_stream* audio = rdp_client->audio; |
| |
| /* Read wave information */ |
| Stream_Read_UINT16(input_stream, rdpsnd->server_timestamp); |
| Stream_Read_UINT16(input_stream, format); |
| Stream_Read_UINT8(input_stream, rdpsnd->waveinfo_block_number); |
| Stream_Seek(input_stream, 3); |
| Stream_Read(input_stream, rdpsnd->initial_wave_data, 4); |
| |
| /* |
| * Size of incoming wave data is equal to the body size field of this |
| * header, less the size of a WaveInfo PDU (not including the header), |
| * thus body_size - 12. |
| */ |
| rdpsnd->incoming_wave_size = header->body_size - 12; |
| |
| /* Read wave in next iteration */ |
| rdpsnd->next_pdu_is_wave = TRUE; |
| |
| /* Reset audio stream if format has changed */ |
| if (audio != NULL) |
| guac_audio_stream_reset(audio, NULL, |
| rdpsnd->formats[format].rate, |
| rdpsnd->formats[format].channels, |
| rdpsnd->formats[format].bps); |
| |
| } |
| |
| void guac_rdpsnd_wave_handler(guac_rdp_common_svc* svc, |
| wStream* input_stream, guac_rdpsnd_pdu_header* header) { |
| |
| guac_client* client = svc->client; |
| guac_rdpsnd* rdpsnd = (guac_rdpsnd*) svc->data; |
| |
| guac_rdp_client* rdp_client = (guac_rdp_client*) client->data; |
| guac_audio_stream* audio = rdp_client->audio; |
| |
| /* Wave Confirmation PDU */ |
| wStream* output_stream = Stream_New(NULL, 8); |
| |
| /* Get wave data */ |
| unsigned char* buffer = Stream_Buffer(input_stream); |
| |
| /* Copy over first four bytes */ |
| memcpy(buffer, rdpsnd->initial_wave_data, 4); |
| |
| /* Write rest of audio packet */ |
| if (audio != NULL) { |
| guac_audio_stream_write_pcm(audio, buffer, |
| rdpsnd->incoming_wave_size + 4); |
| guac_audio_stream_flush(audio); |
| } |
| |
| /* Write Wave Confirmation PDU */ |
| Stream_Write_UINT8(output_stream, SNDC_WAVECONFIRM); |
| Stream_Write_UINT8(output_stream, 0); |
| Stream_Write_UINT16(output_stream, 4); |
| Stream_Write_UINT16(output_stream, rdpsnd->server_timestamp); |
| Stream_Write_UINT8(output_stream, rdpsnd->waveinfo_block_number); |
| Stream_Write_UINT8(output_stream, 0); |
| |
| /* Send Wave Confirmation PDU */ |
| guac_rdp_common_svc_write(svc, output_stream); |
| |
| /* We no longer expect to receive wave data */ |
| rdpsnd->next_pdu_is_wave = FALSE; |
| |
| } |
| |
| void guac_rdpsnd_close_handler(guac_rdp_common_svc* svc, |
| wStream* input_stream, guac_rdpsnd_pdu_header* header) { |
| |
| /* Do nothing */ |
| |
| } |
| |
