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/*
* Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include "webrtc/common_video/jpeg/data_manager.h"
namespace webrtc
{
typedef struct
{
jpeg_source_mgr mgr;
JOCTET* next_input_byte;
size_t bytes_in_buffer; /* # of byte spaces remaining in buffer */
} DataSrcMgr;
void
jpegSetSrcBuffer(j_decompress_ptr cinfo, JOCTET* srcBuffer, size_t bufferSize)
{
DataSrcMgr* src;
if (cinfo->src == NULL)
{ /* first time for this JPEG object? */
cinfo->src = (struct jpeg_source_mgr *)
(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo,
JPOOL_PERMANENT, sizeof(DataSrcMgr));
}
// Setting required functionality
src = (DataSrcMgr*) cinfo->src;
src->mgr.init_source = initSrc;;
src->mgr.fill_input_buffer = fillInputBuffer;
src->mgr.skip_input_data = skipInputData;
src->mgr.resync_to_restart = jpeg_resync_to_restart; // use default
src->mgr.term_source = termSource;
// setting buffer/src
src->bytes_in_buffer = bufferSize;
src->next_input_byte = srcBuffer;
}
void
initSrc(j_decompress_ptr cinfo)
{
DataSrcMgr *src = (DataSrcMgr*)cinfo->src;
src->mgr.next_input_byte = src->next_input_byte;
src->mgr.bytes_in_buffer = src->bytes_in_buffer;
}
boolean
fillInputBuffer(j_decompress_ptr cinfo)
{
return false;
}
void
skipInputData(j_decompress_ptr cinfo, long num_bytes)
{
DataSrcMgr* src = (DataSrcMgr*)cinfo->src;
if (num_bytes > 0)
{
if ((unsigned long)num_bytes > src->mgr.bytes_in_buffer)
src->mgr.bytes_in_buffer = 0;
else
{
src->mgr.next_input_byte += num_bytes;
src->mgr.bytes_in_buffer -= num_bytes;
}
}
}
void
termSource (j_decompress_ptr cinfo)
{
//
}
} // end of namespace webrtc
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