106 lines
1.9 KiB
C++
106 lines
1.9 KiB
C++
// SPDX-License-Identifier: GPL-2.0-or-later
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// Copyright The Music Player Daemon Project
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/* necessary because libavutil/common.h uses UINT64_C */
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#define __STDC_CONSTANT_MACROS
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#include "FfmpegIo.hxx"
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#include "../DecoderAPI.hxx"
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#include "input/InputStream.hxx"
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extern "C" {
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#include <libavutil/mem.h>
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#if LIBAVUTIL_VERSION_INT >= AV_VERSION_INT(58, 29, 100)
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#include <libavutil/error.h>
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#endif
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}
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AvioStream::~AvioStream()
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{
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if (io != nullptr) {
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av_free(io->buffer);
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av_free(io);
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}
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}
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inline int
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AvioStream::Read(void *dest, int size)
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{
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const auto nbytes = decoder_read(client, input, dest, size);
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if (nbytes == 0)
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return AVERROR_EOF;
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return nbytes;
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}
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inline int64_t
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AvioStream::Seek(int64_t pos, int whence)
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{
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switch (whence) {
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case SEEK_SET:
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break;
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case SEEK_CUR:
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pos += input.GetOffset();
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break;
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case SEEK_END:
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if (!input.KnownSize())
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return -1;
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pos += input.GetSize();
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break;
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case AVSEEK_SIZE:
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if (!input.KnownSize())
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return -1;
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return input.GetSize();
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default:
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return -1;
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}
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try {
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input.LockSeek(pos);
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return input.GetOffset();
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} catch (...) {
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return -1;
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}
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}
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int
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AvioStream::_Read(void *opaque, uint8_t *buf, int size)
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{
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AvioStream &stream = *(AvioStream *)opaque;
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return stream.Read(buf, size);
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}
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int64_t
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AvioStream::_Seek(void *opaque, int64_t pos, int whence)
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{
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AvioStream &stream = *(AvioStream *)opaque;
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return stream.Seek(pos, whence);
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}
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bool
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AvioStream::Open()
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{
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constexpr size_t BUFFER_SIZE = 8192;
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auto buffer = (unsigned char *)av_malloc(BUFFER_SIZE);
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if (buffer == nullptr)
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return false;
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io = avio_alloc_context(buffer, BUFFER_SIZE,
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false, this,
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_Read, nullptr,
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input.IsSeekable() ? _Seek : nullptr);
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/* If avio_alloc_context() fails, who frees the buffer? The
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libavformat API documentation does not specify this, it
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only says that AVIOContext.buffer must be freed in the end,
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however no AVIOContext exists in that failure code path. */
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return io != nullptr;
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}
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