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// Copyright 2013 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef MEDIA_FILTERS_STREAM_PARSER_FACTORY_H_
#define MEDIA_FILTERS_STREAM_PARSER_FACTORY_H_
#include <memory>
#include <string>
#include <vector>
#include "base/containers/span.h"
#include "base/strings/string_piece_forward.h"
#include "media/base/media_export.h"
#include "media/base/media_log.h"
#include "media/base/mime_util.h"
namespace media {
class AudioDecoderConfig;
class StreamParser;
class VideoDecoderConfig;
class MEDIA_EXPORT StreamParserFactory {
public:
// Checks to see if the specified |type| and |codecs| list are supported.
// Returns one of the following SupportsType values:
// kNotSupported indicates definitive lack of support.
// kSupported indicates the mime type is supported, any non-empty codecs
// requirement is met for the mime type, and all of the passed codecs are
// supported for the mime type.
// kMaybeSupported indicates the mime type is supported, but the mime type
// requires a codecs parameter that is missing.
static SupportsType IsTypeSupported(base::StringPiece type,
base::span<const std::string> codecs);
// Creates a new StreamParser object if the specified |type| and |codecs| list
// are supported. |media_log| can be used to report errors if there is
// something wrong with |type| or the codec IDs in |codecs|.
// Returns a new StreamParser object if |type| and all codecs listed in
// |codecs| are supported.
// Returns NULL otherwise.
// The |audio_config| and |video_config| overloads behave similarly, except
// the caller must provide a valid, supported decoder config; those overloads'
// usage indicates that we intend to buffer WebCodecs encoded audio or video
// chunks with this parser's ProcessChunks() method. Note that
// these overloads do not check support, unlike the |type| and |codecs|
// version. Support checking for WebCodecs-originated decoder configs could be
// async, and should be done by the caller if necessary as part of the decoder
// config creation rather than relying upon parser creation to do this
// potentially expensive step (this step is typically done in a synchronous
// API call by the web app, such as addSourceBuffer().) Like |type| and
// |codecs| versions, basic IsValidConfig() is done on configs emitted from
// the parser. Failing that catching an unsupported config, eventual pipeline
// error should occur for unsupported or invalid decoder configs during
// attempted decode.
static std::unique_ptr<StreamParser> Create(
base::StringPiece type,
base::span<const std::string> codecs,
MediaLog* media_log);
static std::unique_ptr<StreamParser> Create(
std::unique_ptr<AudioDecoderConfig> audio_config);
static std::unique_ptr<StreamParser> Create(
std::unique_ptr<VideoDecoderConfig> video_config);
};
} // namespace media
#endif // MEDIA_FILTERS_STREAM_PARSER_FACTORY_H_
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