1 /*
2 *
3 * Copyright 2015, The Android Open Source Project
4 *
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17
18 #define LOG_TAG "AudioFlinger"
19 //#define LOG_NDEBUG 0
20 #include "Configuration.h"
21 #include <system/audio.h>
22 #include <utils/Log.h>
23
24 #include <audio_utils/spdif/SPDIFEncoder.h>
25
26 #include "AudioHwDevice.h"
27 #include "SpdifStreamOut.h"
28
29 namespace android {
30
31 /**
32 * If the AudioFlinger is processing encoded data and the HAL expects
33 * PCM then we need to wrap the data in an SPDIF wrapper.
34 */
SpdifStreamOut(AudioHwDevice * dev,audio_output_flags_t flags,audio_format_t format)35 SpdifStreamOut::SpdifStreamOut(AudioHwDevice *dev,
36 audio_output_flags_t flags,
37 audio_format_t format)
38 // Tell the HAL that the data will be compressed audio wrapped in a data burst.
39 : AudioStreamOut(dev, (audio_output_flags_t) (flags | AUDIO_OUTPUT_FLAG_IEC958_NONAUDIO))
40 , mSpdifEncoder(this, format)
41 {
42 }
43
open(audio_io_handle_t handle,audio_devices_t devices,struct audio_config * config,const char * address)44 status_t SpdifStreamOut::open(
45 audio_io_handle_t handle,
46 audio_devices_t devices,
47 struct audio_config *config,
48 const char *address)
49 {
50 struct audio_config customConfig = *config;
51
52 mApplicationConfig.format = config->format;
53 mApplicationConfig.sample_rate = config->sample_rate;
54 mApplicationConfig.channel_mask = config->channel_mask;
55
56 mRateMultiplier = spdif_rate_multiplier(config->format);
57 if (mRateMultiplier <= 0) {
58 ALOGE("ERROR SpdifStreamOut::open() unrecognized format 0x%08X\n", config->format);
59 return BAD_VALUE;
60 }
61 customConfig.sample_rate = config->sample_rate * mRateMultiplier;
62
63 customConfig.format = AUDIO_FORMAT_PCM_16_BIT;
64 customConfig.channel_mask = AUDIO_CHANNEL_OUT_STEREO;
65
66 // Always print this because otherwise it could be very confusing if the
67 // HAL and AudioFlinger are using different formats.
68 // Print before open() because HAL may modify customConfig.
69 ALOGI("SpdifStreamOut::open() AudioFlinger requested sampleRate %d, format %#x,"
70 " channelMask %#x", config->sample_rate, config->format, config->channel_mask);
71 ALOGI("SpdifStreamOut::open() HAL configured for sampleRate %d, format %#x, channelMask %#x",
72 customConfig.sample_rate, customConfig.format, customConfig.channel_mask);
73
74 const status_t status = AudioStreamOut::open(
75 handle,
76 devices,
77 &customConfig,
78 address);
79
80 ALOGI("SpdifStreamOut::open() status = %d", status);
81
82 #ifdef TEE_SINK
83 if (status == OK) {
84 // Don't use PCM 16-bit format to avoid WAV encoding IEC61937 data.
85 mTee.set(customConfig.sample_rate,
86 audio_channel_count_from_out_mask(customConfig.channel_mask),
87 AUDIO_FORMAT_IEC61937, NBAIO_Tee::TEE_FLAG_OUTPUT_THREAD);
88 mTee.setId(std::string("_") + std::to_string(handle) + "_D");
89 }
90 #endif
91
92 return status;
93 }
94
flush()95 int SpdifStreamOut::flush()
96 {
97 mSpdifEncoder.reset();
98 return AudioStreamOut::flush();
99 }
100
standby()101 int SpdifStreamOut::standby()
102 {
103 mSpdifEncoder.reset();
104 return AudioStreamOut::standby();
105 }
106
writeDataBurst(const void * buffer,size_t bytes)107 ssize_t SpdifStreamOut::writeDataBurst(const void* buffer, size_t bytes)
108 {
109 const ssize_t written = AudioStreamOut::write(buffer, bytes);
110
111 #ifdef TEE_SINK
112 if (written > 0) {
113 mTee.write(reinterpret_cast<const char *>(buffer),
114 written / AudioStreamOut::getFrameSize());
115 }
116 #endif
117 return written;
118 }
119
write(const void * buffer,size_t numBytes)120 ssize_t SpdifStreamOut::write(const void* buffer, size_t numBytes)
121 {
122 // Write to SPDIF wrapper. It will call back to writeDataBurst().
123 return mSpdifEncoder.write(buffer, numBytes);
124 }
125
126 } // namespace android
127