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Add QueryCodecSupport() to VideoEncoderFactory and VideoDecoderFactory

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QueryCodecSupport() is needed in the coming work with extending
the MediaCapabilities API to WebRTC. In the API, a user can query
whether a specified media configuration is supported, power
efficient, and smooth. QueryCodecSupport() will be used to determine
if the configuration is supported and power efficient.

Bug: chromium:1187565
Change-Id: Ib1d93433a180b433f0bf60d6e871d03cebc4c0a6
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/215922
Commit-Queue: Johannes Kron <kron@webrtc.org>
Reviewed-by: Erik Språng <sprang@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#33843}
This commit is contained in:
Johannes Kron 2021-04-26 22:18:57 +02:00 committed by Commit Bot
parent a866228db1
commit c29e1f5415
2 changed files with 53 additions and 1 deletions
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28
api/video_codecs/video_decoder_factory.h
View File

@ -15,21 +15,47 @@
#include <string>
#include <vector>
#include "absl/types/optional.h"
#include "api/video_codecs/sdp_video_format.h"
#include "rtc_base/system/rtc_export.h"
namespace webrtc {
class VideoDecoder;
struct SdpVideoFormat;
// A factory that creates VideoDecoders.
// NOTE: This class is still under development and may change without notice.
class RTC_EXPORT VideoDecoderFactory {
public:
struct CodecSupport {
bool is_supported = false;
bool is_power_efficient = false;
};
// Returns a list of supported video formats in order of preference, to use
// for signaling etc.
virtual std::vector<SdpVideoFormat> GetSupportedFormats() const = 0;
// Query whether the specifed format is supported or not and if it will be
// power efficient, which is currently interpreted as if there is support for
// hardware acceleration.
// See https://w3c.github.io/webrtc-svc/#scalabilitymodes* for a specification
// of valid values for |scalability_mode|.
// NOTE: QueryCodecSupport is currently an experimental feature that is
// subject to change without notice.
virtual CodecSupport QueryCodecSupport(
const SdpVideoFormat& format,
absl::optional<std::string> scalability_mode) const {
// Default implementation, query for supported formats and check if the
// specified format is supported. Returns false if scalability_mode is
// specified.
CodecSupport codec_support;
if (!scalability_mode) {
codec_support.is_supported = format.IsCodecInList(GetSupportedFormats());
}
return codec_support;
}
// Creates a VideoDecoder for the specified format.
virtual std::unique_ptr<VideoDecoder> CreateVideoDecoder(
const SdpVideoFormat& format) = 0;

26
api/video_codecs/video_encoder_factory.h
View File

@ -12,6 +12,7 @@
#define API_VIDEO_CODECS_VIDEO_ENCODER_FACTORY_H_
#include <memory>
#include <string>
#include <vector>
#include "absl/types/optional.h"
@ -36,6 +37,11 @@ class VideoEncoderFactory {
bool has_internal_source = false;
};
struct CodecSupport {
bool is_supported = false;
bool is_power_efficient = false;
};
// An injectable class that is continuously updated with encoding conditions
// and selects the best encoder given those conditions.
class EncoderSelectorInterface {
@ -78,6 +84,26 @@ class VideoEncoderFactory {
return CodecInfo();
}
// Query whether the specifed format is supported or not and if it will be
// power efficient, which is currently interpreted as if there is support for
// hardware acceleration.
// See https://w3c.github.io/webrtc-svc/#scalabilitymodes* for a specification
// of valid values for |scalability_mode|.
// NOTE: QueryCodecSupport is currently an experimental feature that is
// subject to change without notice.
virtual CodecSupport QueryCodecSupport(
const SdpVideoFormat& format,
absl::optional<std::string> scalability_mode) const {
// Default implementation, query for supported formats and check if the
// specified format is supported. Returns false if scalability_mode is
// specified.
CodecSupport codec_support;
if (!scalability_mode) {
codec_support.is_supported = format.IsCodecInList(GetSupportedFormats());
}
return codec_support;
}
// Creates a VideoEncoder for the specified format.
virtual std::unique_ptr<VideoEncoder> CreateVideoEncoder(
const SdpVideoFormat& format) = 0;