AnotherPacketSource.cpp revision 96e92b58b7e9647b4c7c2f54b62a1b357ab06b66 
1/*
2 * Copyright (C) 2010 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 LOG_NDEBUG 0
18#define LOG_TAG "AnotherPacketSource"
19
20#include "AnotherPacketSource.h"
21
22#include <media/stagefright/foundation/ABuffer.h>
23#include <media/stagefright/foundation/ADebug.h>
24#include <media/stagefright/foundation/AMessage.h>
25#include <media/stagefright/foundation/AString.h>
26#include <media/stagefright/foundation/hexdump.h>
27#include <media/stagefright/MediaBuffer.h>
28#include <media/stagefright/MediaDefs.h>
29#include <media/stagefright/MetaData.h>
30#include <utils/Vector.h>
31
32#include <inttypes.h>
33
34namespace android {
35
36const int64_t kNearEOSMarkUs = 2000000ll; // 2 secs
37
38AnotherPacketSource::AnotherPacketSource(const sp<MetaData> &meta)
39    : mIsAudio(false),
40      mIsVideo(false),
41      mFormat(NULL),
42      mLastQueuedTimeUs(0),
43      mEOSResult(OK),
44      mLatestEnqueuedMeta(NULL),
45      mLatestDequeuedMeta(NULL),
46      mQueuedDiscontinuityCount(0) {
47    setFormat(meta);
48}
49
50void AnotherPacketSource::setFormat(const sp<MetaData> &meta) {
51    CHECK(mFormat == NULL);
52
53    mIsAudio = false;
54    mIsVideo = false;
55
56    if (meta == NULL) {
57        return;
58    }
59
60    mFormat = meta;
61    const char *mime;
62    CHECK(meta->findCString(kKeyMIMEType, &mime));
63
64    if (!strncasecmp("audio/", mime, 6)) {
65        mIsAudio = true;
66    } else  if (!strncasecmp("video/", mime, 6)) {
67        mIsVideo = true;
68    } else {
69        CHECK(!strncasecmp("text/", mime, 5));
70    }
71}
72
73AnotherPacketSource::~AnotherPacketSource() {
74}
75
76status_t AnotherPacketSource::start(MetaData * /* params */) {
77    return OK;
78}
79
80status_t AnotherPacketSource::stop() {
81    return OK;
82}
83
84sp<MetaData> AnotherPacketSource::getFormat() {
85    Mutex::Autolock autoLock(mLock);
86    if (mFormat != NULL) {
87        return mFormat;
88    }
89
90    List<sp<ABuffer> >::iterator it = mBuffers.begin();
91    while (it != mBuffers.end()) {
92        sp<ABuffer> buffer = *it;
93        int32_t discontinuity;
94        if (buffer->meta()->findInt32("discontinuity", &discontinuity)) {
95            break;
96        }
97
98        sp<RefBase> object;
99        if (buffer->meta()->findObject("format", &object)) {
100            return mFormat = static_cast<MetaData*>(object.get());
101        }
102
103        ++it;
104    }
105    return NULL;
106}
107
108status_t AnotherPacketSource::dequeueAccessUnit(sp<ABuffer> *buffer) {
109    buffer->clear();
110
111    Mutex::Autolock autoLock(mLock);
112    while (mEOSResult == OK && mBuffers.empty()) {
113        mCondition.wait(mLock);
114    }
115
116    if (!mBuffers.empty()) {
117        *buffer = *mBuffers.begin();
118        mBuffers.erase(mBuffers.begin());
119
120        int32_t discontinuity;
121        if ((*buffer)->meta()->findInt32("discontinuity", &discontinuity)) {
122            if (wasFormatChange(discontinuity)) {
123                mFormat.clear();
124            }
125
126            --mQueuedDiscontinuityCount;
127            return INFO_DISCONTINUITY;
128        }
129
130        mLatestDequeuedMeta = (*buffer)->meta()->dup();
131
132        sp<RefBase> object;
133        if ((*buffer)->meta()->findObject("format", &object)) {
134            mFormat = static_cast<MetaData*>(object.get());
135        }
136
137        return OK;
138    }
139
140    return mEOSResult;
141}
142
143status_t AnotherPacketSource::read(
144        MediaBuffer **out, const ReadOptions *) {
145    *out = NULL;
146
147    Mutex::Autolock autoLock(mLock);
148    while (mEOSResult == OK && mBuffers.empty()) {
149        mCondition.wait(mLock);
150    }
151
152    if (!mBuffers.empty()) {
153
154        const sp<ABuffer> buffer = *mBuffers.begin();
155        mBuffers.erase(mBuffers.begin());
156        mLatestDequeuedMeta = buffer->meta()->dup();
157
158        int32_t discontinuity;
159        if (buffer->meta()->findInt32("discontinuity", &discontinuity)) {
160            if (wasFormatChange(discontinuity)) {
161                mFormat.clear();
162            }
163
164            return INFO_DISCONTINUITY;
165        }
166
167        sp<RefBase> object;
168        if (buffer->meta()->findObject("format", &object)) {
169            mFormat = static_cast<MetaData*>(object.get());
170        }
171
172        int64_t timeUs;
173        CHECK(buffer->meta()->findInt64("timeUs", &timeUs));
174
175        MediaBuffer *mediaBuffer = new MediaBuffer(buffer);
176
177        mediaBuffer->meta_data()->setInt64(kKeyTime, timeUs);
178
179        *out = mediaBuffer;
180        return OK;
181    }
182
183    return mEOSResult;
184}
185
186bool AnotherPacketSource::wasFormatChange(
187        int32_t discontinuityType) const {
188    if (mIsAudio) {
189        return (discontinuityType & ATSParser::DISCONTINUITY_AUDIO_FORMAT) != 0;
190    }
191
192    if (mIsVideo) {
193        return (discontinuityType & ATSParser::DISCONTINUITY_VIDEO_FORMAT) != 0;
194    }
195
196    return false;
197}
198
199void AnotherPacketSource::queueAccessUnit(const sp<ABuffer> &buffer) {
200    int32_t damaged;
201    if (buffer->meta()->findInt32("damaged", &damaged) && damaged) {
202        // LOG(VERBOSE) << "discarding damaged AU";
203        return;
204    }
205
206    int64_t lastQueuedTimeUs;
207    CHECK(buffer->meta()->findInt64("timeUs", &lastQueuedTimeUs));
208    mLastQueuedTimeUs = lastQueuedTimeUs;
209    ALOGV("queueAccessUnit timeUs=%" PRIi64 " us (%.2f secs)", mLastQueuedTimeUs, mLastQueuedTimeUs / 1E6);
210
211    Mutex::Autolock autoLock(mLock);
212    mBuffers.push_back(buffer);
213    mCondition.signal();
214
215    int32_t discontinuity;
216    if (buffer->meta()->findInt32("discontinuity", &discontinuity)) {
217        ++mQueuedDiscontinuityCount;
218    }
219
220    if (mLatestEnqueuedMeta == NULL) {
221        mLatestEnqueuedMeta = buffer->meta();
222    } else {
223        int64_t latestTimeUs = 0;
224        CHECK(mLatestEnqueuedMeta->findInt64("timeUs", &latestTimeUs));
225        if (lastQueuedTimeUs > latestTimeUs) {
226            mLatestEnqueuedMeta = buffer->meta();
227        }
228    }
229}
230
231void AnotherPacketSource::clear() {
232    Mutex::Autolock autoLock(mLock);
233
234    mBuffers.clear();
235    mEOSResult = OK;
236    mQueuedDiscontinuityCount = 0;
237
238    mFormat = NULL;
239    mLatestEnqueuedMeta = NULL;
240}
241
242void AnotherPacketSource::queueDiscontinuity(
243        ATSParser::DiscontinuityType type,
244        const sp<AMessage> &extra,
245        bool discard) {
246    Mutex::Autolock autoLock(mLock);
247
248    if (discard) {
249        // Leave only discontinuities in the queue.
250        List<sp<ABuffer> >::iterator it = mBuffers.begin();
251        while (it != mBuffers.end()) {
252            sp<ABuffer> oldBuffer = *it;
253
254            int32_t oldDiscontinuityType;
255            if (!oldBuffer->meta()->findInt32(
256                        "discontinuity", &oldDiscontinuityType)) {
257                it = mBuffers.erase(it);
258                continue;
259            }
260
261            ++it;
262        }
263    }
264
265    mEOSResult = OK;
266    mLastQueuedTimeUs = 0;
267    mLatestEnqueuedMeta = NULL;
268    ++mQueuedDiscontinuityCount;
269
270    sp<ABuffer> buffer = new ABuffer(0);
271    buffer->meta()->setInt32("discontinuity", static_cast<int32_t>(type));
272    buffer->meta()->setMessage("extra", extra);
273
274    mBuffers.push_back(buffer);
275    mCondition.signal();
276}
277
278void AnotherPacketSource::signalEOS(status_t result) {
279    CHECK(result != OK);
280
281    Mutex::Autolock autoLock(mLock);
282    mEOSResult = result;
283    mCondition.signal();
284}
285
286bool AnotherPacketSource::hasBufferAvailable(status_t *finalResult) {
287    Mutex::Autolock autoLock(mLock);
288    if (!mBuffers.empty()) {
289        return true;
290    }
291
292    *finalResult = mEOSResult;
293    return false;
294}
295
296int64_t AnotherPacketSource::getBufferedDurationUs(status_t *finalResult) {
297    Mutex::Autolock autoLock(mLock);
298    return getBufferedDurationUs_l(finalResult);
299}
300
301int64_t AnotherPacketSource::getBufferedDurationUs_l(status_t *finalResult) {
302    *finalResult = mEOSResult;
303
304    if (mBuffers.empty()) {
305        return 0;
306    }
307
308    int64_t time1 = -1;
309    int64_t time2 = -1;
310    int64_t durationUs = 0;
311
312    List<sp<ABuffer> >::iterator it = mBuffers.begin();
313    while (it != mBuffers.end()) {
314        const sp<ABuffer> &buffer = *it;
315
316        int64_t timeUs;
317        if (buffer->meta()->findInt64("timeUs", &timeUs)) {
318            if (time1 < 0 || timeUs < time1) {
319                time1 = timeUs;
320            }
321
322            if (time2 < 0 || timeUs > time2) {
323                time2 = timeUs;
324            }
325        } else {
326            // This is a discontinuity, reset everything.
327            durationUs += time2 - time1;
328            time1 = time2 = -1;
329        }
330
331        ++it;
332    }
333
334    return durationUs + (time2 - time1);
335}
336
337// A cheaper but less precise version of getBufferedDurationUs that we would like to use in
338// LiveSession::dequeueAccessUnit to trigger downwards adaptation.
339int64_t AnotherPacketSource::getEstimatedDurationUs() {
340    Mutex::Autolock autoLock(mLock);
341    if (mBuffers.empty()) {
342        return 0;
343    }
344
345    if (mQueuedDiscontinuityCount > 0) {
346        status_t finalResult;
347        return getBufferedDurationUs_l(&finalResult);
348    }
349
350    List<sp<ABuffer> >::iterator it = mBuffers.begin();
351    sp<ABuffer> buffer = *it;
352
353    int64_t startTimeUs;
354    buffer->meta()->findInt64("timeUs", &startTimeUs);
355    if (startTimeUs < 0) {
356        return 0;
357    }
358
359    it = mBuffers.end();
360    --it;
361    buffer = *it;
362
363    int64_t endTimeUs;
364    buffer->meta()->findInt64("timeUs", &endTimeUs);
365    if (endTimeUs < 0) {
366        return 0;
367    }
368
369    int64_t diffUs;
370    if (endTimeUs > startTimeUs) {
371        diffUs = endTimeUs - startTimeUs;
372    } else {
373        diffUs = startTimeUs - endTimeUs;
374    }
375    return diffUs;
376}
377
378status_t AnotherPacketSource::nextBufferTime(int64_t *timeUs) {
379    *timeUs = 0;
380
381    Mutex::Autolock autoLock(mLock);
382
383    if (mBuffers.empty()) {
384        return mEOSResult != OK ? mEOSResult : -EWOULDBLOCK;
385    }
386
387    sp<ABuffer> buffer = *mBuffers.begin();
388    CHECK(buffer->meta()->findInt64("timeUs", timeUs));
389
390    return OK;
391}
392
393bool AnotherPacketSource::isFinished(int64_t duration) const {
394    if (duration > 0) {
395        int64_t diff = duration - mLastQueuedTimeUs;
396        if (diff < kNearEOSMarkUs && diff > -kNearEOSMarkUs) {
397            ALOGV("Detecting EOS due to near end");
398            return true;
399        }
400    }
401    return (mEOSResult != OK);
402}
403
404sp<AMessage> AnotherPacketSource::getLatestEnqueuedMeta() {
405    Mutex::Autolock autoLock(mLock);
406    return mLatestEnqueuedMeta;
407}
408
409sp<AMessage> AnotherPacketSource::getLatestDequeuedMeta() {
410    Mutex::Autolock autoLock(mLock);
411    return mLatestDequeuedMeta;
412}
413
414}  // namespace android
415