root/modules/img_in/img_dec.c

DEFINITIONS

1. DEC_CanHandleStream
2. NewBaseDecoder
3. DeleteBaseDecoder
4. QueryInterfaces
5. LoadInterface
6. ShutdownInterface

/*
 *                      GPAC - Multimedia Framework C SDK
 *
 *                      Authors: Jean Le Feuvre
 *                      Copyright (c) Telecom ParisTech 2000-2012
 *                                      All rights reserved
 *
 *  This file is part of GPAC / image format module
 *
 *  GPAC is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU Lesser General Public License as published by
 *  the Free Software Foundation; either version 2, or (at your option)
 *  any later version.
 *
 *  GPAC 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 Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; see the file COPYING.  If not, write to
 *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 */


#include "img_in.h"


static u32 DEC_CanHandleStream(GF_BaseDecoder *dec, u32 StreamType, GF_ESD *esd, u8 PL)
{
        if (StreamType != GF_STREAM_VISUAL) return GF_CODEC_NOT_SUPPORTED;
        /*media type query*/
        if (!esd) return GF_CODEC_STREAM_TYPE_SUPPORTED;

        switch (esd->decoderConfig->objectTypeIndication) {
#ifdef GPAC_HAS_PNG
        case GPAC_OTI_IMAGE_PNG:
                if (NewPNGDec(dec)) return GF_CODEC_SUPPORTED;
                return GF_CODEC_NOT_SUPPORTED;
#endif
#ifdef GPAC_HAS_JPEG
        case GPAC_OTI_IMAGE_JPEG:
                if (NewJPEGDec(dec)) return GF_CODEC_SUPPORTED;
                return GF_CODEC_NOT_SUPPORTED;
#endif
#ifdef GPAC_HAS_JP2
        case GPAC_OTI_IMAGE_JPEG_2000:
                if (NewJP2Dec(dec)) return GF_CODEC_SUPPORTED;
                return GF_CODEC_NOT_SUPPORTED;
#endif
        case GPAC_BMP_OTI:
                if (NewBMPDec(dec)) return GF_CODEC_SUPPORTED;
                return GF_CODEC_NOT_SUPPORTED;

        default:
#ifdef GPAC_HAS_JP2
        {
                char *dsi = esd->decoderConfig->decoderSpecificInfo ? esd->decoderConfig->decoderSpecificInfo->data : NULL;
                if (dsi && (dsi[0]=='m') && (dsi[1]=='j') && (dsi[2]=='p') && (dsi[3]=='2'))
                        if (NewJP2Dec(dec)) return GF_CODEC_SUPPORTED;
                return GF_CODEC_NOT_SUPPORTED;
        }
#endif
        return GF_CODEC_NOT_SUPPORTED;
        }
        return GF_CODEC_NOT_SUPPORTED;
}


GF_BaseDecoder *NewBaseDecoder()
{
        GF_MediaDecoder *ifce;
        IMGDec *wrap;
        GF_SAFEALLOC(ifce, GF_MediaDecoder);
        if (!ifce) return NULL;
        GF_SAFEALLOC(wrap, IMGDec);
        if (!wrap) {
                gf_free(ifce);
                return NULL;
        }
        ifce->privateStack = wrap;
        ifce->CanHandleStream = DEC_CanHandleStream;

        GF_REGISTER_MODULE_INTERFACE(ifce, GF_MEDIA_DECODER_INTERFACE, "GPAC Image Decoder", "gpac distribution")

        /*other interfaces will be setup at run time*/
        return (GF_BaseDecoder *)ifce;
}

void DeleteBaseDecoder(GF_BaseDecoder *ifcd)
{
        IMGDec *wrap;
        if (!ifcd)
                return;
        wrap = (IMGDec *)ifcd->privateStack;
        if (!wrap)
                return;
        switch (wrap->type) {
        case DEC_PNG:
                DeletePNGDec(ifcd);
                break;
        case DEC_JPEG:
                DeleteJPEGDec(ifcd);
                break;
#ifdef GPAC_HAS_JP2
        case DEC_JP2:
                DeleteJP2Dec(ifcd);
                break;
#endif
        case DEC_BMP:
                DeleteBMPDec(ifcd);
                break;
        default:
                break;
        }
        gf_free(wrap);
        ifcd->privateStack = NULL;
        gf_free(ifcd);
}

GPAC_MODULE_EXPORT
const u32 *QueryInterfaces()
{
        static u32 si [] = {
                GF_MEDIA_DECODER_INTERFACE,
                GF_NET_CLIENT_INTERFACE,
                0
        };
        return si;
}

GPAC_MODULE_EXPORT
GF_BaseInterface *LoadInterface(u32 InterfaceType)
{
        switch (InterfaceType) {
        case GF_MEDIA_DECODER_INTERFACE:
                return (GF_BaseInterface *)NewBaseDecoder();
        case GF_NET_CLIENT_INTERFACE:
                return (GF_BaseInterface *)NewLoaderInterface();
        default:
                return NULL;
        }
}

GPAC_MODULE_EXPORT
void ShutdownInterface(GF_BaseInterface *ifce)
{
        switch (ifce->InterfaceType) {
        case GF_MEDIA_DECODER_INTERFACE:
                DeleteBaseDecoder((GF_BaseDecoder *)ifce);
                break;
        case GF_NET_CLIENT_INTERFACE:
                DeleteLoaderInterface(ifce);
                break;
        }
}

GPAC_MODULE_STATIC_DECLARATION( img_in )