ChannelMixing_Downmixing.php

<?php

require './vendor/autoload.php';

require_once('./common/ConfigProvider.php');

use BitmovinApiSdk\BitmovinApi;
use BitmovinApiSdk\Common\BitmovinApiException;
use BitmovinApiSdk\Common\Logging\ConsoleLogger;
use BitmovinApiSdk\Configuration;
use BitmovinApiSdk\Models\AacAudioConfiguration;
use BitmovinApiSdk\Models\AclEntry;
use BitmovinApiSdk\Models\AclPermission;
use BitmovinApiSdk\Models\AudioMixChannelType;
use BitmovinApiSdk\Models\AudioMixInputChannelLayout;
use BitmovinApiSdk\Models\AudioMixInputStream;
use BitmovinApiSdk\Models\AudioMixInputStreamChannel;
use BitmovinApiSdk\Models\AudioMixInputStreamSourceChannel;
use BitmovinApiSdk\Models\AudioMixSourceChannelType;
use BitmovinApiSdk\Models\CodecConfiguration;
use BitmovinApiSdk\Models\Encoding;
use BitmovinApiSdk\Models\EncodingOutput;
use BitmovinApiSdk\Models\H264VideoConfiguration;
use BitmovinApiSdk\Models\HttpInput;
use BitmovinApiSdk\Models\IngestInputStream;
use BitmovinApiSdk\Models\Input;
use BitmovinApiSdk\Models\InputStream;
use BitmovinApiSdk\Models\MessageType;
use BitmovinApiSdk\Models\Mp4Muxing;
use BitmovinApiSdk\Models\MuxingStream;
use BitmovinApiSdk\Models\Output;
use BitmovinApiSdk\Models\PresetConfiguration;
use BitmovinApiSdk\Models\S3Output;
use BitmovinApiSdk\Models\StartEncodingRequest;
use BitmovinApiSdk\Models\Status;
use BitmovinApiSdk\Models\Stream;
use BitmovinApiSdk\Models\StreamInput;
use BitmovinApiSdk\Models\StreamMode;
use BitmovinApiSdk\Models\StreamSelectionMode;
use BitmovinApiSdk\Models\Task;

/**
 * This example demonstrates one mechanism to downmix a 5.1 stream down to 2.0. It uses an advanced
 * AudioMixInputStream configuration with gain adjusted on each input channel.
 *
 * <p>The following configuration parameters are expected:
 *
 * <ul>
 *   <li>BITMOVIN_API_KEY - Your API key for the Bitmovin API
 *   <li>BITMOVIN_TENANT_ORG_ID - (optional) The ID of the Organisation in which you want to perform
 *       the encoding.
 *   <li>HTTP_INPUT_HOST - The Hostname or IP address of the HTTP server hosting your input files,
 *       e.g.: my-storage.biz
 *   <li>HTTP_INPUT_FILE_PATH_SURROUND_SOUND - the path and filename for a file containing a video
 *       with a 5.1 audio stream
 *   <li>S3_OUTPUT_BUCKET_NAME - The name of your S3 output bucket. Example: my-bucket-name
 *   <li>S3_OUTPUT_ACCESS_KEY - The access key of your S3 output bucket
 *   <li>S3_OUTPUT_SECRET_KEY - The secret key of your S3 output bucket
 *   <li>S3_OUTPUT_BASE_PATH - The base path on your S3 output bucket where content will be written.
 *       Example: /outputs
 * </ul>
 *
 * <p>Configuration parameters will be retrieved from these sources in the listed order:
 *
 * <ol>
 *   <li>command line arguments (eg BITMOVIN_API_KEY=xyz)
 *   <li>properties file located in the root folder of the JAVA examples at ./examples.properties
 *       (see examples.properties.template as reference)
 *   <li>environment variables
 *   <li>properties file located in the home folder at ~/.bitmovin/examples.properties (see
 *       examples.properties.template as reference)
 * </ol>
 */

$exampleName = 'ChannelMixing_Downmixing';

$configProvider = new ConfigProvider();

try {
    $bitmovinApi = new BitmovinApi(Configuration::create()
        ->apiKey($configProvider->getBitmovinApiKey())
        // uncomment the following line if you are working with a multi-tenant account
        // ->tenantOrgId($configProvider->getBitmovinTenantOrgId())
        ->logger(new ConsoleLogger())
    );

    $encoding = createEncoding(
        "Audio Mapping - Channel Mixing - Downmixing",
        "Input with 5.1 track -> Output with downmixed stereo track");

    $input = createHttpInput($configProvider->getHttpInputHost());
    $inputFilePath = $configProvider->getHttpInputFilePathWithSurroundSound();

    $output = createS3Output(
        $configProvider->getS3OutputBucketName(),
        $configProvider->getS3OutputAccessKey(),
        $configProvider->getS3OutputSecretKey()
    );

    $h264Config = createH264VideoConfig();
    $aacConfig = createAacStereoAudioConfig();

    $videoIngestInputStream = createIngestInputStream($encoding, $input, $inputFilePath);
    $audioIngestInputStream = createIngestInputStream($encoding, $input, $inputFilePath);

    $channelConfigLeft = new DownmixConfig(AudioMixChannelType::FRONT_LEFT());
    $channelConfigLeft->addSourceChannels(AudioMixSourceChannelType::FRONT_LEFT(), 1.0);
    $channelConfigLeft->addSourceChannels(AudioMixSourceChannelType::BACK_LEFT(), 0.8);
    $channelConfigLeft->addSourceChannels(AudioMixSourceChannelType::CENTER(), 0.5);

    $channelConfigRight = new DownmixConfig(AudioMixChannelType::FRONT_RIGHT());
    $channelConfigRight->addSourceChannels(AudioMixSourceChannelType::FRONT_RIGHT(), 1.0);
    $channelConfigRight->addSourceChannels(AudioMixSourceChannelType::BACK_RIGHT(), 0.8);
    $channelConfigRight->addSourceChannels(AudioMixSourceChannelType::CENTER(), 0.5);

    $audioMixInputStream = createDownmixInputStream($encoding, $audioIngestInputStream, array($channelConfigLeft, $channelConfigRight));

    $videoStream = createStream($encoding, $videoIngestInputStream, $h264Config);
    $audioStream = createStream($encoding, $audioMixInputStream, $aacConfig);

    createMp4Muxing($encoding, $output, "/", array($videoStream, $audioStream), "stereo-track-downmixed.mp4");
    $startEncodingRequest = new StartEncodingRequest();

    executeEncoding($encoding, $startEncodingRequest);
} catch (Exception $exception) {
    echo $exception;
}

/** Helper classes representing the mapping from source channels to output channels */
class DownmixConfig
{
    public $outputChannelType;
    public $sourceChannels;

    function __construct($outputChannelType)
    {
        $this->outputChannelType = $outputChannelType;
        $this->sourceChannels = [];
    }

    function addSourceChannels($sourceChannelType, $gain)
    {
        $mappingSource = new DownmixConfigChannel($sourceChannelType, $gain);
        $this->sourceChannels[] = $mappingSource;
    }
}

class DownmixConfigChannel
{
    public $sourceChannelType;
    public $gain;

    function __construct($sourceChannelType, $gain)
    {
        $this->sourceChannelType = $sourceChannelType;
        $this->gain = $gain;
    }
}

/**
 * Adds an audio stream to an encoding, by remixing multiple channels from a source input stream
 *
 * <p>API endpoint:
 * https://bitmovin.com/docs/encoding/api-reference/sections/encodings#/Encoding/PostEncodingEncodingsInputStreamsAudioMixByEncodingId
 *
 * @param Encoding $encoding The encoding to which the stream will be added
 * @param InputStream $inputStream The inputStream resource providing the input file
 * @param array $channelConfigs The configuration of the source channel mixing and mapping to the output
 *     channels
 * @return AudioMixInputStream
 * @throws BitmovinApiException
 */
function createDownmixInputStream(Encoding $encoding, InputStream $inputStream, array $channelConfigs): AudioMixInputStream
{
    global $bitmovinApi;

    $audioMixInputStream = new AudioMixInputStream();
    $audioMixInputStream->name = "Downmixing 5.1 to stereo";
    $audioMixInputStream->channelLayout = AudioMixInputChannelLayout::CL_STEREO();

    foreach ($channelConfigs as $channelConfig) {
        $outputChannel = new AudioMixInputStreamChannel();
        $outputChannel->inputStreamId($inputStream->id);
        $outputChannel->outputChannelType($channelConfig->outputChannelType);

        foreach ($channelConfig->sourceChannels as $channelSource) {
            $sourceChannel = new AudioMixInputStreamSourceChannel();
            $sourceChannel->type($channelSource->sourceChannelType);
            $sourceChannel->gain($channelSource->gain);
            $outputChannel->sourceChannels[] = $sourceChannel;
        }

        $audioMixInputStream->audioMixChannels[] = $outputChannel;
    }

    return $bitmovinApi->encoding->encodings->inputStreams->audioMix->create($encoding->id, $audioMixInputStream);
}

/**
 * Starts the actual encoding process and periodically polls its status until it reaches a final
 * state
 *
 * <p>API endpoints:
 * https://bitmovin.com/docs/encoding/api-reference/all#/Encoding/PostEncodingEncodingsStartByEncodingId
 * https://bitmovin.com/docs/encoding/api-reference/sections/encodings#/Encoding/GetEncodingEncodingsStatusByEncodingId
 *
 * <p>Please note that you can also use our webhooks API instead of polling the status. For more
 * information consult the API spec:
 * https://bitmovin.com/docs/encoding/api-reference/sections/notifications-webhooks
 *
 * @param Encoding $encoding The encoding to be started
 * @param StartEncodingRequest $startEncodingRequest The request object to be sent with the start call
 * @throws BitmovinApiException
 * @throws Exception
 */
function executeEncoding(Encoding $encoding, StartEncodingRequest $startEncodingRequest)
{
    global $bitmovinApi;

    $bitmovinApi->encoding->encodings->start($encoding->id, $startEncodingRequest);

    do {
        sleep(5);
        $task = $bitmovinApi->encoding->encodings->status($encoding->id);
        echo 'Encoding status is ' . $task->status . ' (progress: ' . $task->progress . ' %)' . PHP_EOL;
    } while ($task->status != Status::FINISHED() && $task->status != Status::ERROR());

    if ($task->status == Status::ERROR()) {
        logTaskErrors($task);
        throw new Exception('Encoding failed');
    }

    echo 'Encoding finished successfully' . PHP_EOL;
}

/**
 * Creates an MP4 muxing.
 *
 * <p>API endpoint:
 * https://bitmovin.com/docs/encoding/api-reference/sections/encodings#/Encoding/PostEncodingEncodingsMuxingsMp4ByEncodingId
 *
 * @param Encoding $encoding The encoding to add the MP4 muxing to
 * @param Output $output The output that should be used for the muxing to write the segments to
 * @param string $outputPath The output path where the fragments will be written to
 * @param array $streams A list of streams to be added to the muxing
 * @param string $filename The name of the file that will be written to the output
 * @return Mp4Muxing
 * @throws BitmovinApiException
 */
function createMp4Muxing(Encoding $encoding, Output $output, string $outputPath, array $streams, string $filename): Mp4Muxing
{
    global $bitmovinApi;

    $muxing = new Mp4Muxing();
    $muxing->outputs([buildEncodingOutput($output, $outputPath)]);
    $muxing->fileName($filename);

    foreach ($streams as $stream) {
        $muxingStream = new MuxingStream();
        $muxingStream->streamId($stream->id);
        $muxing->streams[] = $muxingStream;
    }

    return $bitmovinApi->encoding->encodings->muxings->mp4->create($encoding->id, $muxing);
}

/**
 * Creates a configuration for the H.264 video codec to be applied to video streams.
 *
 * <p>The output resolution is defined by setting the height to 1080 pixels. Width will be
 * determined automatically to maintain the aspect ratio of your input video.
 *
 * <p>To keep things simple, we use a quality-optimized VoD preset configuration, which will apply
 * proven settings for the codec. See <a
 * href="https://bitmovin.com/docs/encoding/tutorials/how-to-optimize-your-h264-codec-configuration-for-different-use-cases">How
 * to optimize your H264 codec configuration for different use-cases</a> for alternative presets.
 *
 * <p>API endpoint:
 * https://bitmovin.com/docs/encoding/api-reference/sections/configurations#/Encoding/PostEncodingConfigurationsVideoH264
 *
 * @return H264VideoConfiguration
 * @throws BitmovinApiException
 */
function createH264VideoConfig(): H264VideoConfiguration
{
    global $bitmovinApi;

    $h264Config = new H264VideoConfiguration();
    $h264Config->name("H.264 1080p 1.5 Mbit/s");
    $h264Config->presetConfiguration(PresetConfiguration::VOD_STANDARD());
    $h264Config->height(1080);
    $h264Config->bitrate(1500000);

    return $bitmovinApi->encoding->configurations->video->h264->create($h264Config);
}

/**
 * Creates a configuration for the AAC audio codec to be applied to audio streams.
 *
 * <p>API endpoint:
 * https://bitmovin.com/docs/encoding/api-reference/sections/configurations#/Encoding/PostEncodingConfigurationsAudioAac
 * @return AacAudioConfiguration
 * @throws BitmovinApiException
 */
function createAacStereoAudioConfig(): AacAudioConfiguration
{
    global $bitmovinApi;

    $aacConfig = new AacAudioConfiguration();
    $aacConfig->name("AAC 128 kbit/s");
    $aacConfig->bitrate(128000);

    return $bitmovinApi->encoding->configurations->audio->aac->create($aacConfig);
}

/**
 * Adds a video or audio stream to an encoding
 *
 * <p>API endpoint:
 * https://bitmovin.com/docs/encoding/api-reference/sections/encodings#/Encoding/PostEncodingEncodingsStreamsByEncodingId
 *
 * @param Encoding $encoding The encoding to which the stream will be added
 * @param InputStream $inputStream The inputStream resource providing the input file
 * @param CodecConfiguration $codecConfiguration The codec configuration to be applied to the stream
 * @return Stream
 * @throws BitmovinApiException
 */
function createStream(Encoding $encoding, InputStream $inputStream, CodecConfiguration $codecConfiguration): Stream
{
    global $bitmovinApi;

    $streamInput = new StreamInput();
    $streamInput->inputStreamId($inputStream->id);

    $stream = new Stream();
    $stream->inputStreams([$streamInput]);
    $stream->codecConfigId($codecConfiguration->id);
    $stream->mode(StreamMode::STANDARD());

    return $bitmovinApi->encoding->encodings->streams->create($encoding->id, $stream);
}

/**
* Creates an IngestInputStream and adds it to an encoding
*
* <p>The IngestInputStream is used to define where a file to read a stream from is located
*
* <p>API endpoint:
* https://bitmovin.com/docs/encoding/api-reference/sections/encodings#/Encoding/PostEncodingEncodingsInputStreamsIngestByEncodingId
*
* @param Encoding $encoding The encoding to which the stream will be added
* @param Input $input The input resource providing the input file
* @param string $inputPath The path to the input file
* @return IngestInputStream
* @throws BitmovinApiException
*/
function createIngestInputStream(Encoding $encoding, Input $input, string $inputPath) : IngestInputStream
 {
    global $bitmovinApi;

    $ingestInputStream = new IngestInputStream();
    $ingestInputStream->inputId($input->id);
    $ingestInputStream->inputPath($inputPath);
    $ingestInputStream->selectionMode(StreamSelectionMode::AUTO());

    return $bitmovinApi->encoding->encodings->inputStreams->ingest->create($encoding->id, $ingestInputStream);
}

/**
 * Creates a resource representing an AWS S3 cloud storage bucket to which generated content will
 * be transferred. For alternative output methods see <a
 * href="https://bitmovin.com/docs/encoding/articles/supported-input-output-storages">list of
 * supported input and output storages</a>
 *
 * <p>The provided credentials need to allow <i>read</i>, <i>write</i> and <i>list</i> operations.
 * <i>delete</i> should also be granted to allow overwriting of existings files. See <a
 * href="https://bitmovin.com/docs/encoding/faqs/how-do-i-create-a-aws-s3-bucket-which-can-be-used-as-output-location">creating
 * an S3 bucket and setting permissions</a> for further information
 *
 * <p>For reasons of simplicity, a new output resource is created on each execution of this
 * example. In production use, this method should be replaced by a <a
 * href="https://bitmovin.com/docs/encoding/api-reference/sections/outputs#/Encoding/GetEncodingOutputsS3">get
 * call</a> retrieving an existing resource.
 *
 * <p>API endpoint:
 * https://bitmovin.com/docs/encoding/api-reference/sections/outputs#/Encoding/PostEncodingOutputsS3
 *
 * @param string $bucketName The name of the S3 bucket
 * @param string $accessKey The access key of your S3 account
 * @param string $secretKey The secret key of your S3 account
 * @return S3Output
 * @throws BitmovinApiException
 */
function createS3Output(string $bucketName, string $accessKey, string $secretKey): S3Output
{
    global $bitmovinApi;

    $output = new S3Output();
    $output->bucketName($bucketName);
    $output->accessKey($accessKey);
    $output->secretKey($secretKey);

    return $bitmovinApi->encoding->outputs->s3->create($output);
}

/**
 * Creates a resource representing an HTTP server providing the input files. For alternative input
 * methods see <a
 * href="https://bitmovin.com/docs/encoding/articles/supported-input-output-storages">list of
 * supported input and output storages</a>
 *
 * <p>For reasons of simplicity, a new input resource is created on each execution of this
 * example. In production use, this method should be replaced by a <a
 * href="https://bitmovin.com/docs/encoding/api-reference/sections/inputs#/Encoding/GetEncodingInputsHttpByInputId">get
 * call</a> to retrieve an existing resource.
 *
 * <p>API endpoint:
 * https://bitmovin.com/docs/encoding/api-reference/sections/inputs#/Encoding/PostEncodingInputsHttp
 *
 * @param string $host The hostname or IP address of the HTTP server e.g.: my-storage.biz
 * @return HttpInput
 * @throws BitmovinApiException
 */
function createHttpInput(string $host): HttpInput
{
    global $bitmovinApi;

    $input = new HttpInput();
    $input->host($host);

    return $bitmovinApi->encoding->inputs->http->create($input);
}

/**
 * Creates an Encoding object. This is the base object to configure your encoding.
 *
 * <p>API endpoint:
 * https://bitmovin.com/docs/encoding/api-reference/sections/encodings#/Encoding/PostEncodingEncodings
 *
 * @param string $name A name that will help you identify the encoding in our dashboard (required)
 * @param string $description description A description of the encoding (optional)
 * @return Encoding
 * @throws BitmovinApiException
 */
function createEncoding(string $name, string $description): Encoding
{
    global $bitmovinApi;

    $encoding = new Encoding();
    $encoding->name($name);
    $encoding->description($description);

    return $bitmovinApi->encoding->encodings->create($encoding);
}

/**
 * Builds an EncodingOutput object which defines where the output content (e.g. of a muxing) will
 * be written to. Public read permissions will be set for the files written, so they can be
 * accessed easily via HTTP.
 *
 * @param Output $output The output resource to be used by the EncodingOutput
 * @param string $outputPath The path where the content will be written to
 * @return EncodingOutput
 * @throws Exception
 */
function buildEncodingOutput(Output $output, string $outputPath): EncodingOutput
{
    $aclEntry = new AclEntry();
    $aclEntry->permission(AclPermission::PUBLIC_READ());

    $encodingOutput = new EncodingOutput();
    $encodingOutput->outputPath(buildAbsolutePath($outputPath));
    $encodingOutput->outputId($output->id);
    $encodingOutput->acl([$aclEntry]);

    return $encodingOutput;
}

/**
 * Builds an absolute path by concatenating the S3_OUTPUT_BASE_PATH configuration parameter, the
 * name of this example and the given relative path
 *
 * <p>e.g.: /s3/base/path/exampleName/relative/path
 *
 * @param string $relativePath The relaitve path that is concatenated
 * @return string
 * @throws Exception
 */
function buildAbsolutePath(string $relativePath): string
{
    global $exampleName, $configProvider;

    return $configProvider->getS3OutputBasePath() . $exampleName . DIRECTORY_SEPARATOR . trim($relativePath, DIRECTORY_SEPARATOR);
}

function logTaskErrors(Task $task)
{
    if ($task->messages == null) {
        return;
    }

    $messages = array_filter($task->messages, function ($msg) {
        return $msg->type == MessageType::ERROR();
    });

    foreach ($messages as $message) {
        echo $message->text . PHP_EOL;
    }
}