AacBqToPcmCbRenderer.cpp revision a6585530d8cf92658042c001b6a27fc397c62b9f 
1/*
2 * Copyright (C) 2011 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17//#define USE_LOG SLAndroidLogLevel_Debug
18
19#include "sles_allinclusive.h"
20#include "android/include/AacBqToPcmCbRenderer.h"
21#include "android/channels.h"
22#include <media/stagefright/foundation/ADebug.h>
23
24namespace android {
25
26// ADTS header size is 7, but frame size information ends on byte 6 (when counting from byte 1)
27#define ADTS_HEADER_SIZE_UP_TO_FRAMESIZE 6
28
29/**
30 * Returns the size of an AAC ADTS frame.
31 * Note that if the returned value + offset > size, it means that a partial frame starts at that
32 *   offset, but this function will still return the size of the full frame.
33 * @param data pointer to the compressed audio data
34 * @param offset offset in bytes relative to data of where the frame is supposed to start
35 * @param size the size in bytes of the data block starting at data
36 * @return the size in bytes of the AAC ADTS frame starting at the given offset of the given
37 *    memory address, 0 if the frame couldn't be parsed.
38 */
39static size_t getAdtsFrameSize(const uint8_t *data, off64_t offset, size_t size) {
40    size_t frameSize = 0;
41
42    if (!(offset + ADTS_HEADER_SIZE_UP_TO_FRAMESIZE < (off64_t) size)) {
43        SL_LOGE("AacBqToPcmCbRenderer::getAdtsFrameSize() returns 0 (can't read syncword or header)"
44                );
45        return 0;
46    }
47
48    const uint8_t *syncword = data + offset;
49    if ((syncword[0] != 0xff) || ((syncword[1] & 0xf6) != 0xf0)) {
50        SL_LOGE("AacBqToPcmCbRenderer::getAdtsFrameSize() returns 0 (wrong syncword)");
51        return 0;
52    }
53
54    const uint8_t protectionAbsent = data[offset+1] & 0x1;
55
56    const uint8_t* header = data + offset + 3;
57    frameSize = (header[0] & 0x3) << 11 | header[1] << 3 | header[2] >> 5;
58    // the frame size read already contains the size of the header, so no need to add it here
59
60    // protectionAbsent is 0 if there is CRC
61    static const size_t kAdtsHeaderLengthNoCrc = 7;
62    static const size_t kAdtsHeaderLengthWithCrc = 9;
63    size_t headSize = protectionAbsent ? kAdtsHeaderLengthNoCrc : kAdtsHeaderLengthWithCrc;
64    if (headSize > frameSize) {
65        SL_LOGE("AacBqToPcmCbRenderer::getAdtsFrameSize() returns 0 (frameSize %zu < headSize %zu)",
66                frameSize, headSize);
67        return 0;
68    }
69
70    SL_LOGV("AacBqToPcmCbRenderer::getAdtsFrameSize() returns %u", frameSize);
71
72    return frameSize;
73}
74
75/**
76 * Returns whether a block of memory starts and ends on AAC ADTS frame boundaries
77 * @param data pointer to the compressed audio data
78 * @param size the size in bytes of the data block to validate
79 * @return SL_RESULT_SUCCESS if there is AAC ADTS data, and it starts and ends on frame boundaries,
80 *    or an appropriate error code otherwise:
81 *      SL_RESULT_PARAMETER_INVALID if not possible to attempt validation of even one frame
82 *      SL_RESULT_CONTENT_CORRUPTED if the frame contents are otherwise invalid
83 */
84SLresult AacBqToPcmCbRenderer::validateBufferStartEndOnFrameBoundaries(void* data, size_t size)
85{
86    off64_t offset = 0;
87    size_t frameSize = 0;
88
89    if ((NULL == data) || (size == 0)) {
90        SL_LOGE("No ADTS to validate");
91        return SL_RESULT_PARAMETER_INVALID;
92    }
93
94    while (offset < (off64_t) size) {
95        if ((frameSize = getAdtsFrameSize((uint8_t *)data, offset, size)) == 0) {
96            SL_LOGE("found ADTS frame of size 0 at offset %lld", (long long) offset);
97            return SL_RESULT_CONTENT_CORRUPTED;
98        }
99        //SL_LOGV("last good offset %llu", offset);
100        offset += frameSize;
101        if (offset > (off64_t) size) {
102            SL_LOGE("found incomplete ADTS frame at end of data");
103            return SL_RESULT_CONTENT_CORRUPTED;
104        }
105    }
106    if (offset != (off64_t) size) {
107        SL_LOGE("ADTS parsing error: reached end of incomplete frame");
108    }
109    assert(offset == (off64_t) size);
110    return SL_RESULT_SUCCESS;
111}
112
113//--------------------------------------------------------------------------------------------------
114AacBqToPcmCbRenderer::AacBqToPcmCbRenderer(const AudioPlayback_Parameters* params,
115        IAndroidBufferQueue *androidBufferQueue) :
116        AudioToCbRenderer(params),
117        mBqSource(new BufferQueueSource(androidBufferQueue))
118{
119    SL_LOGD("AacBqToPcmCbRenderer::AacBqToPcmCbRenderer()");
120}
121
122
123AacBqToPcmCbRenderer::~AacBqToPcmCbRenderer() {
124    SL_LOGD("AacBqToPcmCbRenderer::~AacBqToPcmCbRenderer()");
125
126}
127
128
129//--------------------------------------------------
130// Event handlers
131void AacBqToPcmCbRenderer::onPrepare() {
132    SL_LOGD("AacBqToPcmCbRenderer::onPrepare()");
133    Mutex::Autolock _l(mBufferSourceLock);
134
135    // Initialize the PCM format info with the known parameters before the start of the decode
136    {
137        android::Mutex::Autolock autoLock(mPcmFormatLock);
138        mPcmFormatValues[ANDROID_KEY_INDEX_PCMFORMAT_BITSPERSAMPLE] = SL_PCMSAMPLEFORMAT_FIXED_16;
139        mPcmFormatValues[ANDROID_KEY_INDEX_PCMFORMAT_CONTAINERSIZE] = 16;
140        //FIXME not true on all platforms
141        mPcmFormatValues[ANDROID_KEY_INDEX_PCMFORMAT_ENDIANNESS] = SL_BYTEORDER_LITTLEENDIAN;
142        //    initialization with the default values: they will be replaced by the actual values
143        //      once the decoder has figured them out
144        mPcmFormatValues[ANDROID_KEY_INDEX_PCMFORMAT_NUMCHANNELS] = UNKNOWN_NUMCHANNELS;
145        mPcmFormatValues[ANDROID_KEY_INDEX_PCMFORMAT_SAMPLERATE] = UNKNOWN_SAMPLERATE;
146        mPcmFormatValues[ANDROID_KEY_INDEX_PCMFORMAT_CHANNELMASK] = UNKNOWN_CHANNELMASK;
147    }
148
149    sp<MediaExtractor> extractor = new AacAdtsExtractor(mBqSource);
150
151    // only decoding a single track of data
152    const size_t kTrackToDecode = 0;
153
154    sp<MediaSource> source = extractor->getTrack(kTrackToDecode);
155    if (source == 0) {
156        SL_LOGE("AacBqToPcmCbRenderer::onPrepare: error getting source from extractor");
157        notifyPrepared(ERROR_UNSUPPORTED);
158        return;
159    }
160    sp<MetaData> meta = extractor->getTrackMetaData(kTrackToDecode);
161
162    // the audio content is not raw PCM, so we need a decoder
163    OMXClient client;
164    CHECK_EQ(client.connect(), (status_t)OK);
165
166    source = OMXCodec::Create(
167            client.interface(), meta, false /* createEncoder */,
168            source);
169
170    if (source == NULL) {
171        SL_LOGE("AacBqToPcmCbRenderer::onPrepare: Could not instantiate decoder.");
172        notifyPrepared(ERROR_UNSUPPORTED);
173        return;
174    }
175
176    meta = source->getFormat();
177
178    SL_LOGD("AacBqToPcmCbRenderer::onPrepare() after instantiating decoder");
179
180    if (source->start() != OK) {
181        SL_LOGE("AacBqToPcmCbRenderer::onPrepare() Failed to start source/decoder.");
182        notifyPrepared(MEDIA_ERROR_BASE);
183        return;
184    }
185
186    //---------------------------------
187    int32_t channelCount;
188    CHECK(meta->findInt32(kKeyChannelCount, &channelCount));
189    int32_t sr;
190    CHECK(meta->findInt32(kKeySampleRate, &sr));
191    // FIXME similar to AudioSfDecoder::onPrepare()
192
193    // already "good to go" (compare to AudioSfDecoder::onPrepare)
194    mCacheStatus = kStatusHigh;
195    mCacheFill = 1000;
196    notifyStatus();
197    notifyCacheFill();
198
199    {
200        android::Mutex::Autolock autoLock(mPcmFormatLock);
201        mPcmFormatValues[ANDROID_KEY_INDEX_PCMFORMAT_SAMPLERATE] = sr;
202        mPcmFormatValues[ANDROID_KEY_INDEX_PCMFORMAT_NUMCHANNELS] = channelCount;
203        mPcmFormatValues[ANDROID_KEY_INDEX_PCMFORMAT_CHANNELMASK] =
204                channelCountToMask(channelCount);
205    }
206    SL_LOGV("AacBqToPcmCbRenderer::onPrepare() channel count=%d SR=%d",
207            channelCount, sr);
208
209    //---------------------------------
210    // The data source, and audio source (a decoder) are ready to be used
211    mDataSource = mBqSource;
212    mAudioSource = source;
213    mAudioSourceStarted = true;
214
215    //-------------------------------------
216    // signal successful completion of prepare
217    mStateFlags |= kFlagPrepared;
218
219    // skipping past AudioToCbRenderer and AudioSfDecoder
220    GenericPlayer::onPrepare();
221
222    SL_LOGD("AacBqToPcmCbRenderer::onPrepare() done, mStateFlags=0x%x", mStateFlags);
223}
224
225} // namespace android
226