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78 lines
2.6 KiB
C++
78 lines
2.6 KiB
C++
/*
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* Copyright (c) 2024, Jelle Raaijmakers <jelle@ladybird.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/Stream.h>
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#include <LibMedia/FFmpeg/FFmpegIOContext.h>
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namespace Media::FFmpeg {
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FFmpegIOContext::FFmpegIOContext(AVIOContext* avio_context)
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: m_avio_context(avio_context)
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{
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}
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FFmpegIOContext::~FFmpegIOContext()
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{
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// NOTE: free the buffer inside the AVIO context, since it might be changed since its initial allocation
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av_free(m_avio_context->buffer);
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avio_context_free(&m_avio_context);
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}
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ErrorOr<NonnullOwnPtr<FFmpegIOContext>> FFmpegIOContext::create(AK::SeekableStream& stream)
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{
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auto* avio_buffer = av_malloc(PAGE_SIZE);
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if (avio_buffer == nullptr)
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return Error::from_string_literal("Failed to allocate AVIO buffer");
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// This AVIOContext explains to avformat how to interact with our stream
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auto* avio_context = avio_alloc_context(
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static_cast<unsigned char*>(avio_buffer),
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PAGE_SIZE,
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0,
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&stream,
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[](void* opaque, u8* buffer, int size) -> int {
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auto& stream = *static_cast<SeekableStream*>(opaque);
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AK::Bytes buffer_bytes { buffer, AK::min<size_t>(size, PAGE_SIZE) };
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auto read_bytes_or_error = stream.read_some(buffer_bytes);
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if (read_bytes_or_error.is_error()) {
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if (read_bytes_or_error.error().code() == EOF)
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return AVERROR_EOF;
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return AVERROR_UNKNOWN;
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}
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int number_of_bytes_read = read_bytes_or_error.value().size();
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if (number_of_bytes_read == 0)
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return AVERROR_EOF;
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return number_of_bytes_read;
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},
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nullptr,
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[](void* opaque, int64_t offset, int whence) -> int64_t {
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whence &= ~AVSEEK_FORCE;
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auto& stream = *static_cast<SeekableStream*>(opaque);
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if (whence == AVSEEK_SIZE)
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return static_cast<int64_t>(stream.size().value());
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auto seek_mode_from_whence = [](int origin) -> SeekMode {
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if (origin == SEEK_CUR)
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return SeekMode::FromCurrentPosition;
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if (origin == SEEK_END)
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return SeekMode::FromEndPosition;
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return SeekMode::SetPosition;
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};
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auto offset_or_error = stream.seek(offset, seek_mode_from_whence(whence));
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if (offset_or_error.is_error())
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return -EIO;
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return 0;
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});
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if (avio_context == nullptr) {
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av_free(avio_buffer);
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return Error::from_string_literal("Failed to allocate AVIO context");
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}
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return make<FFmpegIOContext>(avio_context);
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}
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}
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