static int muxing(
const char *path,
bool useAudio,
bool useVideo,
const char *outputFileName,
bool enableTrim,
int trimStartTimeMs,
int trimEndTimeMs,
int rotationDegrees,
MediaMuxer::OutputFormat container = MediaMuxer::OUTPUT_FORMAT_MPEG_4) {
sp<NuMediaExtractor> extractor = new NuMediaExtractor;
if (extractor->setDataSource(NULL /* httpService */, path) != OK) {
fprintf(stderr, "unable to instantiate extractor. %s\n", path);
return 1;
}
if (outputFileName == NULL) {
outputFileName = "/sdcard/muxeroutput.mp4";
}
ALOGV("input file %s, output file %s", path, outputFileName);
ALOGV("useAudio %d, useVideo %d", useAudio, useVideo);
int fd = open(outputFileName, O_CREAT | O_LARGEFILE | O_TRUNC | O_RDWR, S_IRUSR | S_IWUSR);
if (fd < 0) {
ALOGE("couldn't open file");
return fd;
}
sp<MediaMuxer> muxer = new MediaMuxer(fd, container);
close(fd);
size_t trackCount = extractor->countTracks();
// Map the extractor's track index to the muxer's track index.
KeyedVector<size_t, ssize_t> trackIndexMap;
size_t bufferSize = 1 * 1024 * 1024; // default buffer size is 1MB.
bool haveAudio = false;
bool haveVideo = false;
int64_t trimStartTimeUs = trimStartTimeMs * 1000;
int64_t trimEndTimeUs = trimEndTimeMs * 1000;
bool trimStarted = false;
int64_t trimOffsetTimeUs = 0;
for (size_t i = 0; i < trackCount; ++i) {
sp<AMessage> format;
status_t err = extractor->getTrackFormat(i, &format);
CHECK_EQ(err, (status_t)OK);
ALOGV("extractor getTrackFormat: %s", format->debugString().c_str());
AString mime;
CHECK(format->findString("mime", &mime));
bool isAudio = !strncasecmp(mime.c_str(), "audio/", 6);
bool isVideo = !strncasecmp(mime.c_str(), "video/", 6);
if (useAudio && !haveAudio && isAudio) {
haveAudio = true;
} else if (useVideo && !haveVideo && isVideo) {
haveVideo = true;
} else {
continue;
}
if (isVideo) {
int width , height;
CHECK(format->findInt32("width", &width));
CHECK(format->findInt32("height", &height));
bufferSize = width * height * 4; // Assuming it is maximally 4BPP
}
int64_t duration;
CHECK(format->findInt64("durationUs", &duration));
// Since we got the duration now, correct the start time.
if (enableTrim) {
if (trimStartTimeUs > duration) {
fprintf(stderr, "Warning: trimStartTimeUs > duration,"
" reset to 0\n");
trimStartTimeUs = 0;
}
}
ALOGV("selecting track %zu", i);
err = extractor->selectTrack(i);
CHECK_EQ(err, (status_t)OK);
ssize_t newTrackIndex = muxer->addTrack(format);
if (newTrackIndex < 0) {
fprintf(stderr, "%s track (%zu) unsupported by muxer\n",
isAudio ? "audio" : "video",
i);
} else {
trackIndexMap.add(i, newTrackIndex);
}
}
int64_t muxerStartTimeUs = ALooper::GetNowUs();
bool sawInputEOS = false;
size_t trackIndex = -1;
sp<ABuffer> newBuffer = new ABuffer(bufferSize);
muxer->setOrientationHint(rotationDegrees);
muxer->start();
while (!sawInputEOS) {
status_t err = extractor->getSampleTrackIndex(&trackIndex);
if (err != OK) {
ALOGV("saw input eos, err %d", err);
sawInputEOS = true;
break;
} else if (trackIndexMap.indexOfKey(trackIndex) < 0) {
// ALOGV("skipping input from unsupported track %zu", trackIndex);
extractor->advance();
continue;
} else {
// ALOGV("reading sample from track index %zu\n", trackIndex);
err = extractor->readSampleData(newBuffer);
CHECK_EQ(err, (status_t)OK);
int64_t timeUs;
err = extractor->getSampleTime(&timeUs);
CHECK_EQ(err, (status_t)OK);
sp<MetaData> meta;
err = extractor->getSampleMeta(&meta);
CHECK_EQ(err, (status_t)OK);
uint32_t sampleFlags = 0;
int32_t val;
if (meta->findInt32(kKeyIsSyncFrame, &val) && val != 0) {
// We only support BUFFER_FLAG_SYNCFRAME in the flag for now.
sampleFlags |= MediaCodec::BUFFER_FLAG_SYNCFRAME;
// We turn on trimming at the sync frame.
if (enableTrim && timeUs > trimStartTimeUs &&
timeUs <= trimEndTimeUs) {
if (trimStarted == false) {
trimOffsetTimeUs = timeUs;
}
trimStarted = true;
}
}
// Trim can end at any non-sync frame.
if (enableTrim && timeUs > trimEndTimeUs) {
trimStarted = false;
}
if (!enableTrim || (enableTrim && trimStarted)) {
err = muxer->writeSampleData(newBuffer,
trackIndexMap.valueFor(trackIndex),
timeUs - trimOffsetTimeUs, sampleFlags);
}
extractor->advance();
}
}
muxer->stop();
newBuffer.clear();
trackIndexMap.clear();
int64_t elapsedTimeUs = ALooper::GetNowUs() - muxerStartTimeUs;
fprintf(stderr, "SUCCESS: muxer generate the video in %" PRId64 " ms\n",
elapsedTimeUs / 1000);
return 0;
}
