AnotherPacketSource.cpp revision fef808d42a9c94b0b5ef3c3d5fb0a090edbc42da 
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    if (type == ATSParser::DISCONTINUITY_NONE) {
266        return;
267    }
268
269    mEOSResult = OK;
270    mLastQueuedTimeUs = 0;
271    mLatestEnqueuedMeta = NULL;
272    ++mQueuedDiscontinuityCount;
273
274    sp<ABuffer> buffer = new ABuffer(0);
275    buffer->meta()->setInt32("discontinuity", static_cast<int32_t>(type));
276    buffer->meta()->setMessage("extra", extra);
277
278    mBuffers.push_back(buffer);
279    mCondition.signal();
280}
281
282void AnotherPacketSource::signalEOS(status_t result) {
283    CHECK(result != OK);
284
285    Mutex::Autolock autoLock(mLock);
286    mEOSResult = result;
287    mCondition.signal();
288}
289
290bool AnotherPacketSource::hasBufferAvailable(status_t *finalResult) {
291    Mutex::Autolock autoLock(mLock);
292    if (!mBuffers.empty()) {
293        return true;
294    }
295
296    *finalResult = mEOSResult;
297    return false;
298}
299
300int64_t AnotherPacketSource::getBufferedDurationUs(status_t *finalResult) {
301    Mutex::Autolock autoLock(mLock);
302    return getBufferedDurationUs_l(finalResult);
303}
304
305int64_t AnotherPacketSource::getBufferedDurationUs_l(status_t *finalResult) {
306    *finalResult = mEOSResult;
307
308    if (mBuffers.empty()) {
309        return 0;
310    }
311
312    int64_t time1 = -1;
313    int64_t time2 = -1;
314    int64_t durationUs = 0;
315
316    List<sp<ABuffer> >::iterator it = mBuffers.begin();
317    while (it != mBuffers.end()) {
318        const sp<ABuffer> &buffer = *it;
319
320        int64_t timeUs;
321        if (buffer->meta()->findInt64("timeUs", &timeUs)) {
322            if (time1 < 0 || timeUs < time1) {
323                time1 = timeUs;
324            }
325
326            if (time2 < 0 || timeUs > time2) {
327                time2 = timeUs;
328            }
329        } else {
330            // This is a discontinuity, reset everything.
331            durationUs += time2 - time1;
332            time1 = time2 = -1;
333        }
334
335        ++it;
336    }
337
338    return durationUs + (time2 - time1);
339}
340
341// A cheaper but less precise version of getBufferedDurationUs that we would like to use in
342// LiveSession::dequeueAccessUnit to trigger downwards adaptation.
343int64_t AnotherPacketSource::getEstimatedDurationUs() {
344    Mutex::Autolock autoLock(mLock);
345    if (mBuffers.empty()) {
346        return 0;
347    }
348
349    if (mQueuedDiscontinuityCount > 0) {
350        status_t finalResult;
351        return getBufferedDurationUs_l(&finalResult);
352    }
353
354    List<sp<ABuffer> >::iterator it = mBuffers.begin();
355    sp<ABuffer> buffer = *it;
356
357    int64_t startTimeUs;
358    buffer->meta()->findInt64("timeUs", &startTimeUs);
359    if (startTimeUs < 0) {
360        return 0;
361    }
362
363    it = mBuffers.end();
364    --it;
365    buffer = *it;
366
367    int64_t endTimeUs;
368    buffer->meta()->findInt64("timeUs", &endTimeUs);
369    if (endTimeUs < 0) {
370        return 0;
371    }
372
373    int64_t diffUs;
374    if (endTimeUs > startTimeUs) {
375        diffUs = endTimeUs - startTimeUs;
376    } else {
377        diffUs = startTimeUs - endTimeUs;
378    }
379    return diffUs;
380}
381
382status_t AnotherPacketSource::nextBufferTime(int64_t *timeUs) {
383    *timeUs = 0;
384
385    Mutex::Autolock autoLock(mLock);
386
387    if (mBuffers.empty()) {
388        return mEOSResult != OK ? mEOSResult : -EWOULDBLOCK;
389    }
390
391    sp<ABuffer> buffer = *mBuffers.begin();
392    CHECK(buffer->meta()->findInt64("timeUs", timeUs));
393
394    return OK;
395}
396
397bool AnotherPacketSource::isFinished(int64_t duration) const {
398    if (duration > 0) {
399        int64_t diff = duration - mLastQueuedTimeUs;
400        if (diff < kNearEOSMarkUs && diff > -kNearEOSMarkUs) {
401            ALOGV("Detecting EOS due to near end");
402            return true;
403        }
404    }
405    return (mEOSResult != OK);
406}
407
408sp<AMessage> AnotherPacketSource::getLatestEnqueuedMeta() {
409    Mutex::Autolock autoLock(mLock);
410    return mLatestEnqueuedMeta;
411}
412
413sp<AMessage> AnotherPacketSource::getLatestDequeuedMeta() {
414    Mutex::Autolock autoLock(mLock);
415    return mLatestDequeuedMeta;
416}
417
418}  // namespace android
419