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ffmpeg / libavcodec / faad.c @ 967be700

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1 280bd7b7 Zdenek Kabelac
/*
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 * Faad decoder
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 * Copyright (c) 2003 Zdenek Kabelac.
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 *
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 * This library is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2 of the License, or (at your option) any later version.
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 *
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 * This library is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with this library; if not, write to the Free Software
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 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
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 */
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/**
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 * @file faad.c
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 * AAC decoder.
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 *
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 * still a bit unfinished - but it plays something
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 */
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#include "avcodec.h"
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#include "faad.h"
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/*
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 * when CONFIG_FAADBIN is defined the libfaad will be opened at runtime
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 */
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//#undef CONFIG_FAADBIN
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//#define CONFIG_FAADBIN
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#ifdef CONFIG_FAADBIN
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#include <dlfcn.h>
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static const char* libfaadname = "libfaad.so.0";
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#else
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#define dlopen(a)
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#define dlclose(a)
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#endif
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typedef struct {
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    void* handle;                /* dlopen handle */
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    void* faac_handle;                /* FAAD library handle */
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    int frame_size;
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    int sample_size;
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    int flags;
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    /* faad calls */
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    faacDecHandle FAADAPI (*faacDecOpen)(void);
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    faacDecConfigurationPtr FAADAPI (*faacDecGetCurrentConfiguration)(faacDecHandle hDecoder);
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    unsigned char FAADAPI (*faacDecSetConfiguration)(faacDecHandle hDecoder,
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                                                     faacDecConfigurationPtr config);
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    long FAADAPI (*faacDecInit)(faacDecHandle hDecoder,
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                                unsigned char *buffer,
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                                unsigned long *samplerate,
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                                unsigned char *channels);
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    char FAADAPI (*faacDecInit2)(faacDecHandle hDecoder, unsigned char *pBuffer,
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                                 unsigned long SizeOfDecoderSpecificInfo,
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                                 unsigned long *samplerate, unsigned char *channels);
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    void FAADAPI (*faacDecClose)(faacDecHandle hDecoder);
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    void* FAADAPI (*faacDecDecode)(faacDecHandle hDecoder,
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                                   faacDecFrameInfo *hInfo,
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                                   unsigned char *buffer);
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    unsigned char* FAADAPI (*faacDecGetErrorMessage)(unsigned char errcode);
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} FAACContext;
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static const unsigned long faac_srates[] =
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{
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    96000, 88200, 64000, 48000, 44100, 32000,
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    24000, 22050, 16000, 12000, 11025, 8000
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};
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static int faac_init_mp4(AVCodecContext *avctx)
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{
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    FAACContext *s = (FAACContext *) avctx->priv_data;
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    unsigned long samplerate;
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    unsigned char channels;
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    int r = 0;
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    if (avctx->extradata)
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        r = s->faacDecInit2(s->faac_handle, (uint8_t*) avctx->extradata,
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                            avctx->extradata_size,
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                            &samplerate, &channels);
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    // else r = s->faacDecInit(s->faac_handle ... );
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    if (r < 0)
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        av_log(avctx, AV_LOG_ERROR, "faacDecInit2 failed r:%d   sr:%ld  ch:%d  s:%d\n",
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                r, samplerate, channels, avctx->extradata_size);
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    return r;
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}
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static int faac_init_aac(AVCodecContext *avctx)
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{
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    FAACContext *s = (FAACContext *) avctx->priv_data;
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    return 0;
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}
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static int faac_decode_frame(AVCodecContext *avctx,
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                             void *data, int *data_size,
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                             uint8_t *buf, int buf_size)
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{
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    FAACContext *s = (FAACContext *) avctx->priv_data;
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    faacDecFrameInfo frame_info;
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    void* out = s->faacDecDecode(s->faac_handle, &frame_info, (unsigned char*)buf);
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    //printf("DECODE FRAME %d, %d, %d - %p\n", buf_size, frame_info.samples, frame_info.bytesconsumed, out);
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    if (frame_info.error > 0) {
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        av_log(avctx, AV_LOG_ERROR, "faac: frame decodinf failed: %s\n",
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                s->faacDecGetErrorMessage(frame_info.error));
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        return 0;
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    }
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    frame_info.samples *= s->sample_size;
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    memcpy(data, out, frame_info.samples); // CHECKME - can we cheat this one
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    if (data_size)
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        *data_size = frame_info.samples;
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    return (buf_size < (int)frame_info.bytesconsumed)
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        ? buf_size : (int)frame_info.bytesconsumed;
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}
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static int faac_decode_end(AVCodecContext *avctx)
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{
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    FAACContext *s = (FAACContext *) avctx->priv_data;
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    if (s->faacDecClose)
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        s->faacDecClose(s->faac_handle);
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    dlclose(s->handle);
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    return 0;
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}
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static int faac_decode_init(AVCodecContext *avctx)
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{
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    FAACContext *s = (FAACContext *) avctx->priv_data;
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    faacDecConfigurationPtr faac_cfg;
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#ifdef CONFIG_FAADBIN
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    const char* err = 0;
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    s->handle = dlopen(libfaadname, RTLD_LAZY);
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    if (!s->handle)
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    {
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        av_log(avctx, AV_LOG_ERROR, "FAAD library: %s could not be opened! \n%s\n",
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                libfaadname, dlerror());
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        return -1;
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    }
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#define dfaac(a, b) \
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    do { static const char* n = "faacDec" #a; \
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    if ((s->faacDec ## a = b dlsym( s->handle, n )) == NULL) { err = n; break; } } while(0)
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    for(;;) {
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#else  /* !CONFIG_FAADBIN */
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#define dfaac(a, b)     s->faacDec ## a = faacDec ## a
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#endif /* CONFIG_FAADBIN */
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        // resolve all needed function calls
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        dfaac(Open, (faacDecHandle FAADAPI (*)(void)));
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        dfaac(GetCurrentConfiguration, (faacDecConfigurationPtr
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                                        FAADAPI (*)(faacDecHandle)));
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        dfaac(SetConfiguration, (unsigned char FAADAPI (*)(faacDecHandle,
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                                                           faacDecConfigurationPtr)));
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        dfaac(Init, (long FAADAPI (*)(faacDecHandle, unsigned char*,
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                                     unsigned long*, unsigned char*)));
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        dfaac(Init2, (char FAADAPI (*)(faacDecHandle, unsigned char*,
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                                       unsigned long, unsigned long*,
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                                       unsigned char*)));
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        dfaac(Close, (void FAADAPI (*)(faacDecHandle hDecoder)));
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        dfaac(Decode, (void* FAADAPI (*)(faacDecHandle, faacDecFrameInfo*,
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                                         unsigned char*)));
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        dfaac(GetErrorMessage, (unsigned char* FAADAPI (*)(unsigned char)));
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#undef dfacc
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#ifdef CONFIG_FAADBIN
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        break;
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    }
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    if (err) {
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        dlclose(s->handle);
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        av_log(avctx, AV_LOG_ERROR, "FAAD library: cannot resolve %s in %s!\n",
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                err, libfaadname);
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        return -1;
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    }
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#endif
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    s->faac_handle = s->faacDecOpen();
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    if (!s->faac_handle) {
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        av_log(avctx, AV_LOG_ERROR, "FAAD library: cannot create handler!\n");
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        faac_decode_end(avctx);
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        return -1;
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    }
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    faac_cfg = s->faacDecGetCurrentConfiguration(s->faac_handle);
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    if (faac_cfg) {
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        switch (avctx->bits_per_sample) {
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        case 8: av_log(avctx, AV_LOG_ERROR, "FAADlib unsupported bps %d\n", avctx->bits_per_sample); break;
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        default:
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        case 16:
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            faac_cfg->outputFormat = FAAD_FMT_16BIT;
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            s->sample_size = 2;
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            break;
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        case 24:
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            faac_cfg->outputFormat = FAAD_FMT_24BIT;
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            s->sample_size = 3;
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            break;
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        case 32:
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            faac_cfg->outputFormat = FAAD_FMT_32BIT;
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            s->sample_size = 4;
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            break;
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        }
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        faac_cfg->defSampleRate = (!avctx->sample_rate) ? 44100 : avctx->sample_rate;
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        faac_cfg->defObjectType = LC;
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    }
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    s->faacDecSetConfiguration(s->faac_handle, faac_cfg);
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    faac_init_mp4(avctx);
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    return 0;
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}
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#define AAC_CODEC(id, name)     \
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AVCodec name ## _decoder = {    \
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    #name,                      \
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    CODEC_TYPE_AUDIO,           \
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    id,                         \
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    sizeof(FAACContext),        \
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    faac_decode_init,           \
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    NULL,                       \
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    faac_decode_end,            \
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    faac_decode_frame,          \
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}
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// FIXME - raw AAC files - maybe just one entry will be enough
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AAC_CODEC(CODEC_ID_AAC, aac);
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// If it's mp4 file - usually embeded into Qt Mov
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AAC_CODEC(CODEC_ID_MPEG4AAC, mpeg4aac);
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#undef AAC_CODEC