faad.c

mpeg4 video codec mpeg4 video codec

/*
 * Faad decoder
 * Copyright (c) 2003 Zdenek Kabelac.
 * Copyright (c) 2004 Thomas Raivio.
 *
 * This library 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 of the License, or (at your option) any later version.
 *
 * This library 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; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

/**
 * @file faad.c
 * AAC decoder.
 *
 * still a bit unfinished - but it plays something
 */

#include "avcodec.h"
#include "faad.h"

#ifndef FAADAPI
#define FAADAPI
#endif

/*
 * when CONFIG_FAADBIN is defined the libfaad will be opened at runtime
 */
//#undef CONFIG_FAADBIN
//#define CONFIG_FAADBIN

#ifdef CONFIG_FAADBIN
#include <dlfcn.h>
static const char* libfaadname = "libfaad.so.0";
#else
#define dlopen(a)
#define dlclose(a)
#endif

typedef struct {
    void* handle;               /* dlopen handle */
    void* faac_handle;          /* FAAD library handle */
    int sample_size;
    int init;

    /* faad calls */
//    faacDecHandle FAADAPI (*faacDecOpen)(void);
//    faacDecConfigurationPtr FAADAPI (*faacDecGetCurrentConfiguration)(faacDecHandle hDecoder);
//#ifndef FAAD2_VERSION
//        int FAADAPI (*faacDecSetConfiguration)(faacDecHandle hDecoder,
//                                           faacDecConfigurationPtr config);
//        int FAADAPI (*faacDecInit)(faacDecHandle hDecoder,
//                                unsigned char *buffer,
//                                unsigned long *samplerate,
//                                unsigned long *channels);
//        int FAADAPI (*faacDecInit2)(faacDecHandle hDecoder, unsigned char *pBuffer,
//                                unsigned long SizeOfDecoderSpecificInfo,
//                                unsigned long *samplerate, unsigned long *channels);
//        int FAADAPI (*faacDecDecode)(faacDecHandle hDecoder,
//                                unsigned char *buffer,
//                                unsigned long *bytesconsumed,
//                                short *sample_buffer,
//                                unsigned long *samples);
//#else
//        unsigned char FAADAPI (*faacDecSetConfiguration)(faacDecHandle hDecoder,
//                                                     faacDecConfigurationPtr config);
//        long FAADAPI (*faacDecInit)(faacDecHandle hDecoder,
//                                   unsigned char *buffer,
//                                 unsigned long buffer_size,
//                                 unsigned long *samplerate,
//                                 unsigned char *channels);
//        char FAADAPI (*faacDecInit2)(faacDecHandle hDecoder, unsigned char *pBuffer,
//                                 unsigned long SizeOfDecoderSpecificInfo,
//                                 unsigned long *samplerate, unsigned char *channels);
//        void *FAADAPI (*faacDecDecode)(faacDecHandle hDecoder,
//                                         faacDecFrameInfo *hInfo,
//                                         unsigned char *buffer,
//                                                                 unsigned long buffer_size);
//        char* FAADAPI (*faacDecGetErrorMessage)(unsigned char errcode);
//#endif
//
//    void FAADAPI (*faacDecClose)(faacDecHandle hDecoder);


} FAACContext;

static const unsigned long faac_srates[] =
{
    96000, 88200, 64000, 48000, 44100, 32000,
    24000, 22050, 16000, 12000, 11025, 8000
};

static int faac_init_mp4(AVCodecContext *avctx)
{
    FAACContext *s = (FAACContext *) avctx->priv_data;
    unsigned long samplerate;
#ifndef FAAD2_VERSION
    unsigned long channels;
#else
    unsigned char channels;
#endif
    int r = 0;

    if (avctx->extradata){
        r = faacDecInit2(s->faac_handle, (uint8_t*) avctx->extradata,
                            avctx->extradata_size,
                            &samplerate, &channels);
        if (r < 0){
            av_log(avctx, AV_LOG_ERROR,
                   "faacDecInit2 failed r:%d   sr:%ld  ch:%ld  s:%d\n",
                   r, samplerate, (long)channels, avctx->extradata_size);
        } else {
            avctx->sample_rate = samplerate;
            avctx->channels = channels;
            s->init = 1;
        }
    }

    return r;
}

static int faac_decode_frame(AVCodecContext *avctx,
                             void *data, int *data_size,
                             uint8_t *buf, int buf_size)
{
    FAACContext *s = (FAACContext *) avctx->priv_data;
#ifndef FAAD2_VERSION
    unsigned long bytesconsumed;
    short *sample_buffer = NULL;
    unsigned long samples;
    int out;
#else
    faacDecFrameInfo frame_info;
    void *out;
#endif
    if(buf_size == 0)
        return 0;
#ifndef FAAD2_VERSION
    out = faacDecDecode(faac_handle,
                           (unsigned char*)buf,
                           &bytesconsumed,
                           data,
                           &samples);
    samples *= sample_size;
    if (data_size)
        *data_size = samples;
    return (buf_size < (int)bytesconsumed)
        ? buf_size : (int)bytesconsumed;
#else

    if(!s->init){
        unsigned long srate;
        unsigned char channels;
        int r = faacDecInit(s->faac_handle, buf, buf_size, &srate, &channels);
        if(r < 0){
            av_log(avctx, AV_LOG_ERROR, "faac: codec init failed: %s\n",
                   faacDecGetErrorMessage(frame_info.error));
            return 0;
        }
        avctx->sample_rate = srate;
        avctx->channels = channels;
        s->init = 1;
    }

    out = faacDecDecode(s->faac_handle, &frame_info, (unsigned char*)buf, (unsigned long)buf_size);

    if (frame_info.error > 0) {
        av_log(avctx, AV_LOG_ERROR, "faac: frame decoding failed: %s\n",
                faacDecGetErrorMessage(frame_info.error));
        return 0;
    }

    frame_info.samples *= s->sample_size;
    memcpy(data, out, frame_info.samples); // CHECKME - can we cheat this one

    if (data_size)
        *data_size = frame_info.samples;

    return (buf_size < (int)frame_info.bytesconsumed)
        ? buf_size : (int)frame_info.bytesconsumed;
#endif
}

static int faac_decode_end(AVCodecContext *avctx)
{
    FAACContext *s = (FAACContext *) avctx->priv_data;

    if (faacDecClose)
        faacDecClose(s->faac_handle);

    dlclose(handle);
    return 0;
}

static int faac_decode_init(AVCodecContext *avctx)
{
    FAACContext *s = (FAACContext *) avctx->priv_data;
    faacDecConfigurationPtr faac_cfg;

    const char* err = 0;

    s->faac_handle = faacDecOpen();
    if (!s->faac_handle) {
        av_log(avctx, AV_LOG_ERROR, "FAAD library: cannot create handler!\n");
        faac_decode_end(avctx);
        return -1;
    }


    faac_cfg = faacDecGetCurrentConfiguration(s->faac_handle);

    if (faac_cfg) {
        switch (avctx->bits_per_sample) {
        case 8: av_log(avctx, AV_LOG_ERROR, "FAADlib unsupported bps %d\n", avctx->bits_per_sample); break;
        default:
        case 16:
#ifdef FAAD2_VERSION
            faac_cfg->outputFormat = FAAD_FMT_16BIT;
#endif
            s->sample_size = 2;
            break;
        case 24:
#ifdef FAAD2_VERSION
            faac_cfg->outputFormat = FAAD_FMT_24BIT;
#endif
            s->sample_size = 3;
            break;
        case 32:
#ifdef FAAD2_VERSION
            faac_cfg->outputFormat = FAAD_FMT_32BIT;
#endif
            s->sample_size = 4;
            break;
        }

        faac_cfg->defSampleRate = (!avctx->sample_rate) ? 44100 : avctx->sample_rate;
        faac_cfg->defObjectType = LC;
    }

    faacDecSetConfiguration(s->faac_handle, faac_cfg);

    faac_init_mp4(avctx);

    return 0;
}

#define AAC_CODEC(id, name)     \
AVCodec name ## _decoder = {    \
    #name,                      \
    CODEC_TYPE_AUDIO,           \
    id,                         \
    sizeof(FAACContext),        \
    faac_decode_init,           \
    NULL,                       \
    faac_decode_end,            \
    faac_decode_frame,          \
}

// FIXME - raw AAC files - maybe just one entry will be enough
AAC_CODEC(CODEC_ID_AAC, aac);
// If it's mp4 file - usually embeded into Qt Mov
//AAC_CODEC(CODEC_ID_MPEG4AAC, mpeg4aac);

#undef AAC_CODEC