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2f60e61dd5
通过 Bytes 所有权和只读 AVBufferRef 引用池化 NV12 输入，消除中间 AVFrame 的整帧复制，并保留 V4L2 编码包脱离硬件缓冲的处理。 允许输出健康时有界预取 MJPEG，在输出背压时优先解码前丢帧；增加等帧、输出等待、丢帧原因及编码分段耗时统计，提供预取和所有权输入的对照开关。 补充缓冲寿命、只读保护、软件编码回退和队列策略测试及接口说明，保留现有 PTS、解码 worker、音频和加密行为。
52 lines
1.5 KiB
C++
52 lines
1.5 KiB
C++
#ifndef OWNED_NV12_FRAME_H
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#define OWNED_NV12_FRAME_H
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extern "C" {
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#include <libavutil/frame.h>
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}
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#include <limits>
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#include <memory>
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using RamInputRelease = void (*)(void *, uint8_t *);
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struct RamFrameDeleter {
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void operator()(AVFrame *frame) const { av_frame_free(&frame); }
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};
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using RamOwnedFrame = std::unique_ptr<AVFrame, RamFrameDeleter>;
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static RamOwnedFrame make_owned_nv12_frame(const uint8_t *data, int length,
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int width, int height, void *owner,
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RamInputRelease release) {
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const int64_t pixels = static_cast<int64_t>(width) * height;
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if (!data || !release || width <= 0 || height <= 0 || width % 2 ||
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height % 2 || pixels > std::numeric_limits<int>::max() / 3 * 2 ||
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length < pixels + pixels / 2) {
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if (release)
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release(owner, const_cast<uint8_t *>(data));
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return RamOwnedFrame();
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}
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RamOwnedFrame frame(av_frame_alloc());
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if (!frame) {
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release(owner, const_cast<uint8_t *>(data));
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return frame;
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}
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frame->buf[0] = av_buffer_create(const_cast<uint8_t *>(data), length, release,
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owner, AV_BUFFER_FLAG_READONLY);
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if (!frame->buf[0]) {
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release(owner, const_cast<uint8_t *>(data));
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return RamOwnedFrame();
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}
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frame->format = AV_PIX_FMT_NV12;
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frame->width = width;
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frame->height = height;
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frame->data[0] = frame->buf[0]->data;
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frame->data[1] = frame->data[0] + pixels;
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frame->linesize[0] = width;
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frame->linesize[1] = width;
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return frame;
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}
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#endif
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