winamp/Src/jpeg/mp4_jpeg_decoder.cpp

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2024-09-24 12:54:57 +00:00
#include "mp4_jpeg_decoder.h"
#include "api__jpeg.h"
#include <api/service/waservicefactory.h>
MP4JPEGDecoder::MP4JPEGDecoder()
{
jpegLoader=0;
width=0;
height=0;
decoded_image = 0;
}
int MP4JPEGDecoder::Open(MP4FileHandle mp4_file, MP4TrackId mp4_track)
{
// load JPEG loader
jpegLoader = new JpgLoad;
if (jpegLoader)
return MP4_VIDEO_SUCCESS;
else
return MP4_VIDEO_FAILURE;
}
void MP4JPEGDecoder::Close()
{
delete jpegLoader;
delete this;
}
int MP4JPEGDecoder::GetOutputFormat(int *x, int *y, int *color_format, double *aspect_ratio)
{
if (!height || !width)
return MP4_VIDEO_FAILURE;
*x = width;
*y = height;
*color_format = '23GR'; // RGB32
return MP4_VIDEO_SUCCESS;
}
int MP4JPEGDecoder::DecodeSample(const void *inputBuffer, size_t inputBufferBytes, MP4Timestamp timestamp)
{
bool change_in_size=false;
if (decoded_image)
WASABI_API_MEMMGR->sysFree(decoded_image);
int decode_width, decode_height;
decoded_image = jpegLoader->loadImage(inputBuffer, (int)inputBufferBytes, &decode_width, &decode_height);
if (!decoded_image)
return MP4_VIDEO_FAILURE;
if (width && decode_width != width // if we have a different width from last time
|| height && decode_height != height)
change_in_size = true;
width = decode_width;
height = decode_height;
return change_in_size?MP4_VIDEO_OUTPUT_FORMAT_CHANGED:MP4_VIDEO_SUCCESS;
}
int MP4JPEGDecoder::CanHandleCodec(const char *codecName)
{
return !strcmp(codecName, "jpeg");
}
int MP4JPEGDecoder::GetPicture(void **data, void **decoder_data, MP4Timestamp *timestamp)
{
if (!decoded_image)
return MP4_VIDEO_FAILURE;
*data = decoded_image;
*decoder_data = 0;
decoded_image = 0; // wipe our hands clean of it so we don't double free
return MP4_VIDEO_SUCCESS;
}
void MP4JPEGDecoder::FreePicture(void *data, void *decoder_data)
{
WASABI_API_MEMMGR->sysFree(data);
}
#define CBCLASS MP4JPEGDecoder
START_DISPATCH;
CB(MPEG4_VIDEO_OPEN, Open)
CB(MPEG4_VIDEO_GETOUTPUTFORMAT, GetOutputFormat)
CB(MPEG4_VIDEO_DECODE, DecodeSample)
CB(MPEG4_VIDEO_HANDLES_CODEC, CanHandleCodec)
CB(MPEG4_VIDEO_GET_PICTURE, GetPicture)
VCB(MPEG4_VIDEO_FREE_PICTURE, FreePicture)
END_DISPATCH;
#undef CBCLASS