fegger
71218b1b1f
Add FFmpeg-based encoder/decoder with SPS/PPS extradata, Annex-B output normalization, low-latency libx264 settings, and a round-trip unit test. Includes review hardening: cached SwsContext, bitrate-only rate control, std::byte/uin8_t cast helpers, and richer test assertions.
54 lines
1.3 KiB
C++
54 lines
1.3 KiB
C++
#pragma once
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#include "screencast/capture/capture.h"
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#include "screencast/codec/error.h"
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#include <cstdint>
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#include <memory>
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#include <string>
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#include <vector>
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namespace sc {
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struct EncodedFrame {
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uint64_t capture_timestamp_ns = 0;
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uint32_t rtp_timestamp = 0;
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bool is_keyframe = false;
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std::vector<std::byte> data; // Annex-B H.264 NAL units
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};
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struct EncoderConfig {
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std::string codec_name = "h264";
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int width = 0;
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int height = 0;
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int frame_rate_num = 30;
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int frame_rate_den = 1;
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int bitrate_kbps = 4000;
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bool hardware_accel = false;
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};
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class Encoder {
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public:
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virtual ~Encoder() = default;
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// Encode one captured frame. Returns an empty vector if the encoder emits
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// no packet for this frame.
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virtual CodecResult<std::vector<EncodedFrame>> encode(const CapturedFrame& frame) = 0;
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// Flush the encoder and return any remaining packets.
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virtual CodecResult<std::vector<EncodedFrame>> flush() = 0;
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// Force the next output frame to be a keyframe.
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virtual void request_keyframe() = 0;
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// Codec-specific parameters required by a decoder (SPS/PPS for H.264).
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virtual std::vector<std::byte> get_extradata() const = 0;
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};
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class EncoderFactory {
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public:
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static CodecResult<std::unique_ptr<Encoder>> create(const EncoderConfig& config);
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};
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} // namespace sc
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