modules/amr_float_dec/amr_float

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This source file includes following definitions.
AMR_AttachStream
AMR_DetachStream
AMR_GetCapabilities
AMR_SetCapabilities
AMR_ProcessData
AMR_CanHandleStream
AMR_GetCodecName
NewAMRFTDecoder
DeleteAMRFTDecoder
QueryInterfaces
LoadInterface
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 / AMR decoder 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.
 *
 */



/*decoder Interface*/
#include <gpac/modules/codec.h>
#include <gpac/modules/service.h>
#include <gpac/constants.h>

#if (defined(WIN32) || defined (_WIN32_WCE)) && defined(GPAC_HAS_AMR_FT)
/*AMR NB*/
#include "amr_api.h"

#ifndef GPAC_HAS_AMR_FT_WB
#define GPAC_HAS_AMR_FT_WB
#endif

#if !defined(__GNUC__)
#pragma comment(lib, "libamrfloat")
#endif

#else

#ifdef GPAC_HAS_AMR_FT
/*AMR WB*/
#include "amr_nb_ft/interf_dec.h"
#endif

#ifdef GPAC_HAS_AMR_FT_WB
/*AMR WB*/
#include "amr_wb_ft/dec_if.h"
#endif

#endif

/*default size in CU of composition memory for audio*/
#define DEFAULT_AUDIO_CM_SIZE                   12
/*default critical size in CU of composition memory for audio*/
#define DEFAULT_AUDIO_CM_TRIGGER                4

typedef struct
{
        Bool is_amr_wb;
        u32 sample_rate, out_size, num_samples;
        u8 num_channels;

        /*AMR NB state vars*/
        int *nb_destate;
        void *wb_destate;
} AMRFTDec;

#define AMRFTCTX() AMRFTDec *ctx = (AMRFTDec *) ifcg->privateStack


static GF_Err AMR_AttachStream(GF_BaseDecoder *ifcg, GF_ESD *esd)
{
        GF_BitStream *bs;
        u32 packed;
        AMRFTCTX();
        if (esd->dependsOnESID || !esd->decoderConfig->decoderSpecificInfo) return GF_NOT_SUPPORTED;

        /*AMRWB dec is another module*/
        if (!strnicmp(esd->decoderConfig->decoderSpecificInfo->data, "sawb", 4)) ctx->is_amr_wb = GF_TRUE;
        else if (!strnicmp(esd->decoderConfig->decoderSpecificInfo->data, "samr", 4) || !strnicmp(esd->decoderConfig->decoderSpecificInfo->data, "amr ", 4)) ctx->is_amr_wb = GF_FALSE;
        else return GF_NOT_SUPPORTED;


        bs = gf_bs_new(esd->decoderConfig->decoderSpecificInfo->data, esd->decoderConfig->decoderSpecificInfo->dataLength, GF_BITSTREAM_READ);
        gf_bs_read_u32(bs);
        gf_bs_read_u32(bs);
        ctx->num_channels = gf_bs_read_u16(bs);
        gf_bs_read_u16(bs);
        gf_bs_read_u8(bs);
        packed = gf_bs_read_u8(bs);
        gf_bs_del(bs);
        /*max possible frames in a sample are seen in MP4, that's 15*/
        if (!packed) packed = 15;

        if (ctx->is_amr_wb) {
#ifdef GPAC_HAS_AMR_FT_WB
                ctx->wb_destate = D_IF_init();
                if (!ctx->wb_destate) return GF_IO_ERR;
#else
                return GF_NOT_SUPPORTED;
#endif
                ctx->num_samples = 320;
                ctx->sample_rate = 16000;
        } else {
#ifdef GPAC_HAS_AMR_FT
                ctx->nb_destate = Decoder_Interface_init();
                if (!ctx->nb_destate) return GF_IO_ERR;
#else
                return GF_NOT_SUPPORTED;
#endif
                ctx->num_samples = 160;
                ctx->sample_rate = 8000;
        }

        ctx->out_size = packed * 2 * ctx->num_samples * ctx->num_channels;
        return GF_OK;
}

static GF_Err AMR_DetachStream(GF_BaseDecoder *ifcg, u16 ES_ID)
{
        AMRFTCTX();

#ifdef GPAC_HAS_AMR_FT
        if (ctx->nb_destate) Decoder_Interface_exit(ctx->nb_destate);
#endif
        ctx->nb_destate = NULL;
#ifdef GPAC_HAS_AMR_FT_WB
        if (ctx->wb_destate) D_IF_exit(ctx->wb_destate);
#endif
        ctx->wb_destate = NULL;
        ctx->sample_rate = ctx->out_size = ctx->num_samples = 0;
        ctx->num_channels = 0;
        return GF_OK;
}
static GF_Err AMR_GetCapabilities(GF_BaseDecoder *ifcg, GF_CodecCapability *capability)
{
        AMRFTCTX();
        switch (capability->CapCode) {
        /*not tested yet*/
        case GF_CODEC_RESILIENT:
                capability->cap.valueInt = 1;
                break;
        case GF_CODEC_OUTPUT_SIZE:
                capability->cap.valueInt = ctx->out_size;
                break;
        case GF_CODEC_SAMPLERATE:
                capability->cap.valueInt = ctx->sample_rate;
                break;
        case GF_CODEC_NB_CHAN:
                capability->cap.valueInt = ctx->num_channels;
                break;
        case GF_CODEC_BITS_PER_SAMPLE:
                capability->cap.valueInt = 16;
                break;
        case GF_CODEC_BUFFER_MIN:
                capability->cap.valueInt = DEFAULT_AUDIO_CM_TRIGGER;
                break;
        case GF_CODEC_BUFFER_MAX:
                capability->cap.valueInt = DEFAULT_AUDIO_CM_SIZE;
                break;
        /*FIXME: get exact sampling window*/
        case GF_CODEC_CU_DURATION:
                capability->cap.valueInt = ctx->num_samples;
                break;
        case GF_CODEC_PADDING_BYTES:
                capability->cap.valueInt = 4;
                break;
        case GF_CODEC_CHANNEL_CONFIG:
                if (ctx->num_channels==1) {
                        capability->cap.valueInt = GF_AUDIO_CH_FRONT_CENTER;
                } else {
                        capability->cap.valueInt = GF_AUDIO_CH_FRONT_LEFT | GF_AUDIO_CH_FRONT_RIGHT;
                }
                break;
        default:
                capability->cap.valueInt = 0;
                break;
        }
        return GF_OK;
}

static GF_Err AMR_SetCapabilities(GF_BaseDecoder *ifcg, GF_CodecCapability capability)
{
        /*return unsupported to avoid confusion by the player (like SR changing ...) */
        return GF_NOT_SUPPORTED;
}


static GF_Err AMR_ProcessData(GF_MediaDecoder *ifcg,
                              char *inBuffer, u32 inBufferLength,
                              u16 ES_ID, u32 *CTS,
                              char *outBuffer, u32 *outBufferLength,
                              u8 PaddingBits, u32 mmlevel)
{
        u32 offset;
        u8 toc, ft;
        AMRFTCTX();

        /*if late or seeking don't decode (each frame is a RAP)*/
        /*      switch (mmlevel) {
        case GF_CODEC_LEVEL_SEEK:
        case GF_CODEC_LEVEL_DROP:
                *outBufferLength = 0;
                return GF_OK;
        default:
                break;
        }
        */
        if (ctx->out_size > *outBufferLength) {
                *outBufferLength = ctx->out_size;
                return GF_BUFFER_TOO_SMALL;
        }

        *outBufferLength = 0;

        while (inBufferLength) {
                toc = inBuffer[0];
                ft = (toc >> 3) & 0x0F;

                offset = 0;
                if (ctx->is_amr_wb) {
#ifdef GPAC_HAS_AMR_FT_WB
                        D_IF_decode(ctx->wb_destate, inBuffer, (s16 *) outBuffer, 0);
                        *outBufferLength += 320*2;
                        outBuffer += 320*2;
                        offset = (u32)GF_AMR_WB_FRAME_SIZE[ft] + 1;
#endif
                } else {
#ifdef GPAC_HAS_AMR_FT
                        Decoder_Interface_Decode(ctx->nb_destate, inBuffer, (s16 *) outBuffer, 0);
                        *outBufferLength += 160*2;
                        outBuffer += 160*2;
                        offset = (u32)GF_AMR_FRAME_SIZE[ft] + 1;
#endif
                }
                /*don't complain but...*/
                if (inBufferLength<offset) return GF_OK;
                inBuffer += offset;
                inBufferLength -= offset;
        }
        return GF_OK;
}


static u32 AMR_CanHandleStream(GF_BaseDecoder *dec, u32 StreamType, GF_ESD *esd, u8 PL)
{
        char *dsi;
        /*we handle audio only*/
        if (StreamType!=GF_STREAM_AUDIO) return GF_CODEC_NOT_SUPPORTED;
        /*media type query*/
        if (!esd) return GF_CODEC_STREAM_TYPE_SUPPORTED;

        if (esd->decoderConfig->objectTypeIndication != GPAC_OTI_MEDIA_GENERIC) return GF_CODEC_NOT_SUPPORTED;
        dsi = esd->decoderConfig->decoderSpecificInfo ? esd->decoderConfig->decoderSpecificInfo->data : NULL;
        if (!dsi) return GF_CODEC_NOT_SUPPORTED;
        if (esd->decoderConfig->decoderSpecificInfo->dataLength < 4) return GF_CODEC_NOT_SUPPORTED;

#ifdef GPAC_HAS_AMR_FT
        if (!strnicmp(dsi, "samr", 4) || !strnicmp(dsi, "amr ", 4)) return GF_CODEC_SUPPORTED;
#endif
#ifdef GPAC_HAS_AMR_FT_WB
        if (!strnicmp(dsi, "sawb", 4)) return GF_CODEC_SUPPORTED;
#endif
        return GF_CODEC_NOT_SUPPORTED;
}


static const char *AMR_GetCodecName(GF_BaseDecoder *ifcg)
{
        AMRFTCTX();
        if (ctx->is_amr_wb) return "3GPP Floating-point AMR Wideband";
        return "3GPP Floating-point AMR";
}

GF_MediaDecoder *NewAMRFTDecoder()
{
        AMRFTDec *dec;
        GF_MediaDecoder *ifce;
        GF_SAFEALLOC(ifce , GF_MediaDecoder);
        dec = (AMRFTDec*)gf_malloc(sizeof(AMRFTDec));
        memset(dec, 0, sizeof(AMRFTDec));
        ifce->privateStack = dec;
        ifce->CanHandleStream = AMR_CanHandleStream;

        /*setup our own interface*/
        ifce->AttachStream = AMR_AttachStream;
        ifce->DetachStream = AMR_DetachStream;
        ifce->GetCapabilities = AMR_GetCapabilities;
        ifce->SetCapabilities = AMR_SetCapabilities;
        ifce->ProcessData = AMR_ProcessData;
        ifce->GetName = AMR_GetCodecName;

        GF_REGISTER_MODULE_INTERFACE(ifce, GF_MEDIA_DECODER_INTERFACE, "AMR-FT 3GPP decoder", "gpac distribution");

        return ifce;
}

void DeleteAMRFTDecoder(GF_BaseDecoder *ifcg)
{
        AMRFTCTX();
        gf_free(ctx);
        gf_free(ifcg);
}

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

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

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

GPAC_MODULE_STATIC_DECLARATION( amr_float )
/* [<][>][^][v][top][bottom][index][help] */
root/modules/amr_float_dec/amr_float_dec.c

DEFINITIONS
