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 mRateMultiplier = 4;
63 break;
64 case AUDIO_FORMAT_AC3:
65 case AUDIO_FORMAT_DTS:
66 case AUDIO_FORMAT_DTS_HD:
67 mRateMultiplier = 1;
68 break;
69 default:
70 ALOGE("ERROR SpdifStreamOut::open() unrecognized format 0x%08X\n",
71 config->format);
72 return BAD_VALUE;
73 }
74 customConfig.sample_rate = config->sample_rate * mRateMultiplier;
75
76 customConfig.format = AUDIO_FORMAT_PCM_16_BIT;
77 customConfig.channel_mask = AUDIO_CHANNEL_OUT_STEREO;
78
79 // Always print this because otherwise it could be very confusing if the
80 // HAL and AudioFlinger are using different formats.
81 // Print before open() because HAL may modify customConfig.
82 ALOGI("SpdifStreamOut::open() AudioFlinger requested"
83 " sampleRate %d, format %#x, channelMask %#x",
84 config->sample_rate,
85 config->format,
86 config->channel_mask);
87 ALOGI("SpdifStreamOut::open() HAL configured for"
88 " sampleRate %d, format %#x, channelMask %#x",
89 customConfig.sample_rate,
90 customConfig.format,
91 customConfig.channel_mask);
92
93 status_t status = AudioStreamOut::open(
94 handle,
95 devices,
96 &customConfig,
97 address);
98
99 ALOGI("SpdifStreamOut::open() status = %d", status);
100
101 return status;
102 }
103
flush()104 int SpdifStreamOut::flush()
105 {
106 mSpdifEncoder.reset();
107 return AudioStreamOut::flush();
108 }
109
standby()110 int SpdifStreamOut::standby()
111 {
112 mSpdifEncoder.reset();
113 return AudioStreamOut::standby();
114 }
115
writeDataBurst(const void * buffer,size_t bytes)116 ssize_t SpdifStreamOut::writeDataBurst(const void* buffer, size_t bytes)
117 {
118 return AudioStreamOut::write(buffer, bytes);
119 }
120
write(const void * buffer,size_t numBytes)121 ssize_t SpdifStreamOut::write(const void* buffer, size_t numBytes)
122 {
123 // Write to SPDIF wrapper. It will call back to writeDataBurst().
124 return mSpdifEncoder.write(buffer, numBytes);
125 }
126
127 } // namespace android
128