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// Copyright (C) 2010 Dirk Vanden Boer <dirk.vdb@gmail.com>
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#include "jpegwriter.h"
#include <stdexcept>
#include <cstdio>
#include <cstring>
#include <cassert>
#include <algorithm>
using namespace std;
namespace ffmpegthumbnailer
{
struct BufferWriter
{
jpeg_destination_mgr m_DestMgr;
uint8_t* m_pDataBuffer;
std::vector<uint8_t>* m_pDataSink;
};
const static int JPEG_WORK_BUFFER_SIZE = 8192;
static void jpegInitDestination(j_compress_ptr pCompressionInfo);
static boolean jpegFlushWorkBuffer(j_compress_ptr pCompressionInfo);
static void jpegDestroyDestination(j_compress_ptr pCompressionInfo);
JpegWriter::JpegWriter(const string& outputFile)
: ImageWriter()
, m_pFile(nullptr)
, m_pBufferWriter(nullptr)
{
init();
m_pFile = outputFile == "-" ? stdout : fopen(outputFile.c_str(), "wb");
if (!m_pFile)
{
throw logic_error(string("Failed to open output file: ") + outputFile);
}
jpeg_stdio_dest(&m_Compression, m_pFile);
}
JpegWriter::JpegWriter(std::vector<uint8_t>& outputBuffer)
: ImageWriter()
, m_pFile(nullptr)
, m_pBufferWriter(nullptr)
{
init();
m_Compression.dest = (jpeg_destination_mgr*)(m_Compression.mem->alloc_small) ((j_common_ptr) &m_Compression, JPOOL_PERMANENT, sizeof(BufferWriter));
m_pBufferWriter = reinterpret_cast<BufferWriter*>(m_Compression.dest);
m_pBufferWriter->m_DestMgr.init_destination = jpegInitDestination;
m_pBufferWriter->m_DestMgr.empty_output_buffer = jpegFlushWorkBuffer;
m_pBufferWriter->m_DestMgr.term_destination = jpegDestroyDestination;
m_pBufferWriter->m_pDataSink = &outputBuffer;
}
JpegWriter::~JpegWriter()
{
if (m_pFile)
{
fclose(m_pFile);
}
jpeg_destroy_compress(&m_Compression);
}
void JpegWriter::init()
{
m_Compression.err = jpeg_std_error(&m_ErrorHandler);
jpeg_create_compress(&m_Compression);
}
void JpegWriter::setText(const string& /*key*/, const string& /*value*/)
{
}
void JpegWriter::writeFrame(uint8_t** rgbData, int width, int height, int quality)
{
m_Compression.image_width = width;
m_Compression.image_height = height;
m_Compression.input_components = 3;
m_Compression.in_color_space = JCS_RGB;
quality = min(10, quality);
quality = max(0, quality);
jpeg_set_defaults(&m_Compression);
jpeg_set_quality(&m_Compression, quality * 10, TRUE);
jpeg_start_compress(&m_Compression, TRUE);
while (m_Compression.next_scanline < m_Compression.image_height)
{
(void) jpeg_write_scanlines(&m_Compression, reinterpret_cast<JSAMPLE**>(&rgbData[m_Compression.next_scanline]), 1);
}
jpeg_finish_compress(&m_Compression);
}
void jpegInitDestination(j_compress_ptr pCompressionInfo)
{
auto bufWriter = reinterpret_cast<BufferWriter*>(pCompressionInfo->dest);
bufWriter->m_pDataBuffer = (uint8_t*)(*pCompressionInfo->mem->alloc_small) ((j_common_ptr) pCompressionInfo, JPOOL_IMAGE, JPEG_WORK_BUFFER_SIZE);
bufWriter->m_DestMgr.next_output_byte = bufWriter->m_pDataBuffer;
bufWriter->m_DestMgr.free_in_buffer = JPEG_WORK_BUFFER_SIZE;
}
boolean jpegFlushWorkBuffer(j_compress_ptr pCompressionInfo)
{
auto bufWriter = reinterpret_cast<BufferWriter*>(pCompressionInfo->dest);
size_t prevSize = bufWriter->m_pDataSink->size();
bufWriter->m_pDataSink->resize(prevSize + JPEG_WORK_BUFFER_SIZE);
memcpy((&bufWriter->m_pDataSink->front()) + prevSize, bufWriter->m_pDataBuffer, JPEG_WORK_BUFFER_SIZE);
bufWriter->m_DestMgr.next_output_byte = bufWriter->m_pDataBuffer;
bufWriter->m_DestMgr.free_in_buffer = JPEG_WORK_BUFFER_SIZE;
return TRUE;
}
void jpegDestroyDestination(j_compress_ptr pCompressionInfo)
{
auto bufWriter = reinterpret_cast<BufferWriter*>(pCompressionInfo->dest);
size_t datacount = JPEG_WORK_BUFFER_SIZE - bufWriter->m_DestMgr.free_in_buffer;
size_t prevSize = bufWriter->m_pDataSink->size();
bufWriter->m_pDataSink->resize(prevSize + datacount);
memcpy((&bufWriter->m_pDataSink->front()) + prevSize, bufWriter->m_pDataBuffer, datacount);
}
}
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