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 <system/audio.h>
21 #include <utils/Log.h>
22
23 #include <audio_utils/spdif/SPDIFEncoder.h>
24
25 #include "AudioHwDevice.h"
26 #include "SpdifStreamOut.h"
27
28 namespace android {
29
30 /**
31 * If the AudioFlinger is processing encoded data and the HAL expects
32 * PCM then we need to wrap the data in an SPDIF wrapper.
33 */
SpdifStreamOut(AudioHwDevice * dev,audio_output_flags_t flags,audio_format_t format)34 SpdifStreamOut::SpdifStreamOut(AudioHwDevice *dev,
35 audio_output_flags_t flags,
36 audio_format_t format)
37 // Tell the HAL that the data will be compressed audio wrapped in a data burst.
38 : AudioStreamOut(dev, (audio_output_flags_t) (flags | AUDIO_OUTPUT_FLAG_IEC958_NONAUDIO))
39 , mSpdifEncoder(this, format)
40 , mApplicationFormat(AUDIO_FORMAT_DEFAULT)
41 , mApplicationSampleRate(0)
42 , mApplicationChannelMask(0)
43 {
44 }
45
open(audio_io_handle_t handle,audio_devices_t devices,struct audio_config * config,const char * address)46 status_t SpdifStreamOut::open(
47 audio_io_handle_t handle,
48 audio_devices_t devices,
49 struct audio_config *config,
50 const char *address)
51 {
52 struct audio_config customConfig = *config;
53
54 mApplicationFormat = config->format;
55 mApplicationSampleRate = config->sample_rate;
56 mApplicationChannelMask = config->channel_mask;
57
58 // Some data bursts run at a higher sample rate.
59 // TODO Move this into the audio_utils as a static method.
60 switch(config->format) {
61 case AUDIO_FORMAT_E_AC3:
62 case AUDIO_FORMAT_E_AC3_JOC:
63 mRateMultiplier = 4;
64 break;
65 case AUDIO_FORMAT_AC3:
66 case AUDIO_FORMAT_DTS:
67 case AUDIO_FORMAT_DTS_HD:
68 mRateMultiplier = 1;
69 break;
70 default:
71 ALOGE("ERROR SpdifStreamOut::open() unrecognized format 0x%08X\n",
72 config->format);
73 return BAD_VALUE;
74 }
75 customConfig.sample_rate = config->sample_rate * mRateMultiplier;
76
77 customConfig.format = AUDIO_FORMAT_PCM_16_BIT;
78 customConfig.channel_mask = AUDIO_CHANNEL_OUT_STEREO;
79
80 // Always print this because otherwise it could be very confusing if the
81 // HAL and AudioFlinger are using different formats.
82 // Print before open() because HAL may modify customConfig.
83 ALOGI("SpdifStreamOut::open() AudioFlinger requested"
84 " sampleRate %d, format %#x, channelMask %#x",
85 config->sample_rate,
86 config->format,
87 config->channel_mask);
88 ALOGI("SpdifStreamOut::open() HAL configured for"
89 " sampleRate %d, format %#x, channelMask %#x",
90 customConfig.sample_rate,
91 customConfig.format,
92 customConfig.channel_mask);
93
94 status_t status = AudioStreamOut::open(
95 handle,
96 devices,
97 &customConfig,
98 address);
99
100 ALOGI("SpdifStreamOut::open() status = %d", status);
101
102 return status;
103 }
104
flush()105 int SpdifStreamOut::flush()
106 {
107 mSpdifEncoder.reset();
108 return AudioStreamOut::flush();
109 }
110
standby()111 int SpdifStreamOut::standby()
112 {
113 mSpdifEncoder.reset();
114 return AudioStreamOut::standby();
115 }
116
writeDataBurst(const void * buffer,size_t bytes)117 ssize_t SpdifStreamOut::writeDataBurst(const void* buffer, size_t bytes)
118 {
119 return AudioStreamOut::write(buffer, bytes);
120 }
121
write(const void * buffer,size_t numBytes)122 ssize_t SpdifStreamOut::write(const void* buffer, size_t numBytes)
123 {
124 // Write to SPDIF wrapper. It will call back to writeDataBurst().
125 return mSpdifEncoder.write(buffer, numBytes);
126 }
127
128 } // namespace android
129