Aegisub/libaegisub/audio/provider_pcm.cpp

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// Copyright (c) 2014, Thomas Goyne <plorkyeran@aegisub.org>
//
// Permission to use, copy, modify, and distribute this software for any
// purpose with or without fee is hereby granted, provided that the above
// copyright notice and this permission notice appear in all copies.
//
// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
//
// Aegisub Project http://www.aegisub.org/
#include "libaegisub/audio/provider.h"
#include "libaegisub/file_mapping.h"
#include "libaegisub/fs.h"
#include "libaegisub/make_unique.h"
#include <vector>
namespace {
using namespace agi;
struct IndexPoint {
uint64_t start_byte;
uint64_t num_samples;
};
struct file_ended {};
class PCMAudioProvider : public AudioProvider {
void FillBuffer(void *buf, int64_t start, int64_t count) const override {
auto write_buf = static_cast<char *>(buf);
auto bps = bytes_per_sample * channels;
uint64_t pos = 0;
for (auto ip : index_points) {
if (count == 0) break;
if (pos + ip.num_samples <= (uint64_t)start) {
pos += ip.num_samples;
continue;
}
auto read_offset = start - pos;
auto read_count = std::min<size_t>(count, ip.num_samples - read_offset);
auto bytes = read_count * bps;
memcpy(write_buf, file.read(ip.start_byte + read_offset * bps, bytes), bytes);
write_buf += bytes;
count -= read_count;
start += read_count;
pos += ip.num_samples;
}
}
protected:
mutable read_file_mapping file;
uint64_t file_pos = 0;
PCMAudioProvider(fs::path const& filename) : file(filename) { }
template<typename T, typename UInt>
const T *Read(UInt *data_left) {
if (*data_left < sizeof(T)) throw file_ended();
if (file.size() - file_pos < sizeof(T)) throw file_ended();
auto data = file.read(file_pos, sizeof(T));
file_pos += sizeof(T);
*data_left -= sizeof(T);
return reinterpret_cast<const T *>(data);
}
std::vector<IndexPoint> index_points;
};
struct FourCC {
std::array<char, 4> data;
bool operator!=(const char *cmp) const {
return data[0] != cmp[0] || data[1] != cmp[1]
|| data[2] != cmp[2] || data[3] != cmp[3];
}
bool operator==(const char *cmp) const { return !(*this != cmp); }
};
// Overview of RIFF WAV: <http://www.sonicspot.com/guide/wavefiles.html>
struct RiffWav {
using DataSize = uint32_t;
using ChunkId = FourCC;
static const char *riff_id() { return "RIFF"; }
static const char *wave_id() { return "WAVE"; }
static const char *fmt_id() { return "fmt "; }
static const char *data_id() { return "data "; }
static const int alignment = 1;
static uint32_t data_size(uint32_t size) { return size; }
static uint32_t chunk_size(uint32_t size) { return size; }
};
typedef std::array<uint8_t, 16> GUID;
static const GUID w64GuidRIFF = {{
// {66666972-912E-11CF-A5D6-28DB04C10000}
0x72, 0x69, 0x66, 0x66, 0x2E, 0x91, 0xCF, 0x11, 0xA5, 0xD6, 0x28, 0xDB, 0x04, 0xC1, 0x00, 0x00
}};
static const GUID w64GuidWAVE = {{
// {65766177-ACF3-11D3-8CD1-00C04F8EDB8A}
0x77, 0x61, 0x76, 0x65, 0xF3, 0xAC, 0xD3, 0x11, 0x8C, 0xD1, 0x00, 0xC0, 0x4F, 0x8E, 0xDB, 0x8A
}};
static const GUID w64Guidfmt = {{
// {20746D66-ACF3-11D3-8CD1-00C04F8EDB8A}
0x66, 0x6D, 0x74, 0x20, 0xF3, 0xAC, 0xD3, 0x11, 0x8C, 0xD1, 0x00, 0xC0, 0x4F, 0x8E, 0xDB, 0x8A
}};
static const GUID w64Guiddata = {{
// {61746164-ACF3-11D3-8CD1-00C04F8EDB8A}
0x64, 0x61, 0x74, 0x61, 0xF3, 0xAC, 0xD3, 0x11, 0x8C, 0xD1, 0x00, 0xC0, 0x4F, 0x8E, 0xDB, 0x8A
}};
// http://www.vcs.de/fileadmin/user_upload/MBS/PDF/Whitepaper/Informations_about_Sony_Wave64.pdf
struct Wave64 {
using DataSize = uint64_t;
using ChunkId = GUID;
static GUID riff_id() { return w64GuidRIFF; }
static GUID wave_id() { return w64GuidWAVE; }
static GUID fmt_id() { return w64Guidfmt; }
static GUID data_id() { return w64Guiddata; }
static const uint64_t alignment = 7ULL;
// Wave 64 includes the size of the header in the chunk sizes
static uint64_t data_size(uint64_t size) { return size - 16; }
static uint64_t chunk_size(uint64_t size) { return size - 24; }
};
template<typename Impl>
class WavPCMAudioProvider : public PCMAudioProvider {
public:
WavPCMAudioProvider(fs::path const& filename)
: PCMAudioProvider(filename)
{
using DataSize = typename Impl::DataSize;
using ChunkId = typename Impl::ChunkId;
try {
auto data_left = std::numeric_limits<DataSize>::max();
if (*Read<ChunkId>(&data_left) != Impl::riff_id())
throw AudioDataNotFound("File is not a RIFF file");
data_left = Impl::data_size(*Read<DataSize>(&data_left));
if (*Read<ChunkId>(&data_left) != Impl::wave_id())
throw AudioDataNotFound("File is not a RIFF WAV file");
while (data_left) {
auto chunk_fcc = *Read<ChunkId>(&data_left);
auto chunk_size = Impl::chunk_size(*Read<DataSize>(&data_left));
data_left -= chunk_size;
if (chunk_fcc == Impl::fmt_id()) {
if (channels || sample_rate || bytes_per_sample)
throw AudioProviderError("Multiple 'fmt ' chunks not supported");
auto compression = *Read<uint16_t>(&chunk_size);
if (compression != 1)
throw AudioProviderError("File is not uncompressed PCM");
channels = *Read<uint16_t>(&chunk_size);
sample_rate = *Read<uint32_t>(&chunk_size);
Read<uint32_t>(&chunk_size); // Average bytes per sample; meaningless
Read<uint16_t>(&chunk_size); // Block align
bytes_per_sample = (*Read<uint16_t>(&chunk_size) + 7) / 8;
}
else if (chunk_fcc == Impl::data_id()) {
if (!channels || !sample_rate || !bytes_per_sample)
throw AudioProviderError("Found 'data' chunk without format being set.");
index_points.emplace_back(IndexPoint{file_pos, chunk_size / bytes_per_sample / channels});
num_samples += chunk_size / bytes_per_sample / channels;
}
// There's a bunch of other chunk types. They're all dumb.
// blocks are aligned and the padding bytes are not included in
// the size of the chunk
file_pos += (chunk_size + Impl::alignment) & ~Impl::alignment;
}
}
catch (file_ended) {
if (!channels || !sample_rate || !bytes_per_sample)
throw AudioDataNotFound("File ended before reaching format chunk");
// Truncated files are fine otherwise
}
decoded_samples = num_samples;
}
};
}
namespace agi {
std::unique_ptr<AudioProvider> CreatePCMAudioProvider(fs::path const& filename, BackgroundRunner *) {
bool wrong_file_type = true;
std::string msg;
try {
return make_unique<WavPCMAudioProvider<RiffWav>>(filename);
}
catch (AudioDataNotFound const& err) {
msg = "RIFF PCM WAV audio provider: " + err.GetMessage();
}
catch (AudioProviderError const& err) {
wrong_file_type = false;
msg = "RIFF PCM WAV audio provider: " + err.GetMessage();
}
try {
return make_unique<WavPCMAudioProvider<Wave64>>(filename);
}
catch (AudioDataNotFound const& err) {
msg += "\nWave64 audio provider: " + err.GetMessage();
}
catch (AudioProviderError const& err) {
wrong_file_type = false;
msg += "\nWave64 audio provider: " + err.GetMessage();
}
if (wrong_file_type)
throw AudioDataNotFound(msg);
else
throw AudioProviderError(msg);
}
}