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/*
* OSD Picture in Picture plugin for the Video Disk Recorder
*
* Copyright (C) 2004 - 2008 Andreas Regel <andreas.regel@powarman.de>
* Copyright (C) 2004 Sascha Volkenandt <sascha@akv-soft.de>
*
* 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.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <stdio.h>
#include <stdlib.h>
#include "decoder.h"
#include "setup.h"
int cDecoder::Open()
{
m_Codec = avcodec_find_decoder(CODEC_ID_MPEG2VIDEO);
if (!m_Codec)
{
printf("codec not found\n");
return -1;
}
m_Context = avcodec_alloc_context();
if (avcodec_open(m_Context, m_Codec) < 0)
{
printf("could not open codec\n");
return -1;
}
m_PicDecoded = avcodec_alloc_frame();
m_PicResample = avcodec_alloc_frame();
m_BufferResample = new unsigned char[400 * 300 * 4]; // size for RGBA32
#ifndef USE_SWSCALE
m_PicConvert = avcodec_alloc_frame();
m_BufferConvert = new unsigned char[400 * 300 * 4]; // size for RGBA32
#endif
return 0;
}
int cDecoder::Close()
{
#ifndef USE_SWSCALE
delete[] m_BufferConvert;
free(m_PicConvert);
#endif
delete[] m_BufferResample;
free(m_PicResample);
avcodec_close(m_Context);
free(m_Context);
free(m_PicDecoded);
return 0;
}
int cDecoder::Decode(unsigned char * data, int length)
{
int gotPicture, len;
AVPacket avpkt;
av_init_packet(&avpkt);
avpkt.data = (uint8_t *)data;
avpkt.size = length;
avpkt.flags = AV_PKT_FLAG_KEY;
len = avcodec_decode_video2(m_Context, m_PicDecoded, &gotPicture, &avpkt);
if (len < 0)
{
printf("Error while decoding frame\n");
return -1;
}
if (!gotPicture)
{
return -1;
}
return 0;
}
int cDecoder::Resample(int width, int height, bool ConvertToRGB)
{
m_Width = width;
m_Height = height;
#ifdef USE_SWSCALE
AVPicture pic_crop;
struct SwsContext * context;
av_picture_crop(&pic_crop, (AVPicture *) m_PicDecoded, PIX_FMT_YUV420P, OsdPipSetup.CropTop, OsdPipSetup.CropLeft);
#ifdef FF_API_SWS_GETCONTEXT
if (!(context = sws_alloc_context())) {
printf("Error initializing scale context.\n");
return -1;
}
av_set_int(context, "srcw", m_Context->width - (OsdPipSetup.CropLeft + OsdPipSetup.CropRight));
av_set_int(context, "srch", m_Context->height - (OsdPipSetup.CropTop + OsdPipSetup.CropBottom));
av_set_int(context, "src_format", PIX_FMT_YUV420P);
av_set_int(context, "dstw", m_Width);
av_set_int(context, "dsth", m_Height);
#ifdef USE_NEW_FFMPEG_HEADERS
av_set_int(context, "dst_format", ConvertToRGB ? PIX_FMT_RGB32 : PIX_FMT_YUV420P);
#else
av_set_int(context, "dst_format", ConvertToRGB ? PIX_FMT_RGBA32 : PIX_FMT_YUV420P);
#endif
av_set_int(context, "sws_flags", SWS_LANCZOS);
if (sws_init_context(context, NULL, NULL) < 0) {
printf("Error initializing conversion context.\n");
sws_freeContext(context);
return -1;
}
#else
context = sws_getContext(m_Context->width - (OsdPipSetup.CropLeft + OsdPipSetup.CropRight),
m_Context->height - (OsdPipSetup.CropTop + OsdPipSetup.CropBottom),
PIX_FMT_YUV420P,
#ifdef USE_NEW_FFMPEG_HEADERS
m_Width, m_Height, ConvertToRGB ? PIX_FMT_RGB32 : PIX_FMT_YUV420P,
#else
m_Width, m_Height, ConvertToRGB ? PIX_FMT_RGBA32 : PIX_FMT_YUV420P,
#endif
SWS_LANCZOS, NULL, NULL, NULL);
if (!context) {
printf("Error initializing scale context.\n");
return -1;
}
#endif
avpicture_fill((AVPicture *) m_PicResample, m_BufferResample,
#ifdef USE_NEW_FFMPEG_HEADERS
ConvertToRGB ? PIX_FMT_RGB32 : PIX_FMT_YUV420P,
#else
ConvertToRGB ? PIX_FMT_RGBA32 : PIX_FMT_YUV420P,
#endif
m_Width, m_Height);
sws_scale(context, pic_crop.data, pic_crop.linesize,
0, m_Context->height - (OsdPipSetup.CropTop + OsdPipSetup.CropBottom),
m_PicResample->data, m_PicResample->linesize);
sws_freeContext(context);
#else
ImgReSampleContext * contextResample;
#if LIBAVCODEC_BUILD < 4708
contextResample = img_resample_full_init(m_Width, m_Height,
m_Context->width, m_Context->height,
OsdPipSetup.CropTop, OsdPipSetup.CropBottom,
OsdPipSetup.CropLeft, OsdPipSetup.CropRight);
#else
contextResample = img_resample_full_init(m_Width, m_Height,
m_Context->width, m_Context->height,
OsdPipSetup.CropTop, OsdPipSetup.CropBottom,
OsdPipSetup.CropLeft, OsdPipSetup.CropRight,
0, 0, 0, 0);
#endif
if (!contextResample) {
printf("Error initializing resample context.\n");
return -1;
}
avpicture_fill((AVPicture *) m_PicResample, m_BufferResample,
PIX_FMT_YUV420P, m_Width, m_Height);
img_resample(contextResample, (AVPicture *) m_PicResample, (AVPicture *) m_PicDecoded);
img_resample_close(contextResample);
if (ConvertToRGB)
{
avpicture_fill((AVPicture *) m_PicConvert, m_BufferConvert,
#ifdef USE_NEW_FFMPEG_HEADERS
PIX_FMT_RGB32, m_Width, m_Height);
#else
PIX_FMT_RGBA32, m_Width, m_Height);
#endif
#ifdef USE_NEW_FFMPEG_HEADERS
img_convert((AVPicture *) m_PicConvert, PIX_FMT_RGB32,
#else
img_convert((AVPicture *) m_PicConvert, PIX_FMT_RGBA32,
#endif
(AVPicture *) m_PicResample, PIX_FMT_YUV420P,
m_Width, m_Height);
}
#endif
return 0;
}
double cDecoder::AspectRatio()
{
#if LIBAVCODEC_BUILD < 4687
return m_Context->aspect_ratio;
#else
return av_q2d(m_Context->sample_aspect_ratio) * (double) m_Context->width / (double) m_Context->height;
#endif
}
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