/* 
 * Copyright (C) 2003-2007 Benny Prijono <benny@prijono.org>
 *
 * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA 
 */

/*
 * Contributed by:
 *  Toni < buldozer at aufbix dot org >
 */
#include "mp3_port.h"
#include <pjmedia/errno.h>
#include <pj/assert.h>
#include <pj/file_access.h>
#include <pj/file_io.h>
#include <pj/log.h>
#include <pj/pool.h>
#include <pj/string.h>
#include <pj/unicode.h>


/* Include BladeDLL declarations */
#include "BladeMP3EncDLL.h"


#define THIS_FILE           "mp3_writer.c"
#define SIGNATURE           PJMEDIA_SIG_CLASS_PORT_AUD('M','W')
#define BYTES_PER_SAMPLE    2

static struct BladeDLL
{
    void                *hModule;
    int                  refCount;
    BEINITSTREAM         beInitStream;
    BEENCODECHUNK        beEncodeChunk;
    BEDEINITSTREAM       beDeinitStream;
    BECLOSESTREAM        beCloseStream;
    BEVERSION            beVersion;
    BEWRITEVBRHEADER     beWriteVBRHeader;
    BEWRITEINFOTAG       beWriteInfoTag;
} BladeDLL;


struct mp3_file_port
{
    pjmedia_port    base;
    pj_size_t       total;
    pj_oshandle_t   fd;
    pj_size_t       cb_size;
    pj_status_t    (*cb)(pjmedia_port*, void*);
    pj_bool_t        subscribed;
    pj_bool_t        cb_called;
    void           (*cb2)(pjmedia_port*, void*);

    unsigned        silence_duration;

    pj_str_t                    mp3_filename;
    pjmedia_mp3_encoder_option  mp3_option;
    unsigned                    mp3_samples_per_frame;
    pj_int16_t                 *mp3_sample_buf;
    unsigned                    mp3_sample_pos;
    HBE_STREAM                  mp3_stream;
    unsigned char              *mp3_buf;
};


static pj_status_t file_put_frame(pjmedia_port *this_port, 
                                  const pjmedia_frame *frame);
static pj_status_t file_get_frame(pjmedia_port *this_port, 
                                  pjmedia_frame *frame);
static pj_status_t file_on_destroy(pjmedia_port *this_port);


#if defined(PJ_WIN32) || defined(_WIN32) || defined(WIN32)

#include <windows.h>
#define DLL_NAME    PJ_T("LAME_ENC.DLL")

/*
 * Load BladeEncoder DLL.
 */
static pj_status_t init_blade_dll(void)
{
    if (BladeDLL.refCount == 0) {
        #define GET_PROC(type, name)  \
            BladeDLL.name = (type)GetProcAddress(BladeDLL.hModule, PJ_T(#name)); \
            if (BladeDLL.name == NULL) { \
                PJ_LOG(1,(THIS_FILE, "Unable to find %s in %s", #name, DLL_NAME)); \
                return PJ_RETURN_OS_ERROR(GetLastError()); \
            }

        BE_VERSION beVersion;
        BladeDLL.hModule = (void*)LoadLibrary(DLL_NAME);
        if (BladeDLL.hModule == NULL) {
            pj_status_t status = PJ_RETURN_OS_ERROR(GetLastError());
            char errmsg[PJ_ERR_MSG_SIZE];

            pj_strerror(status, errmsg, sizeof(errmsg));
            PJ_LOG(1,(THIS_FILE, "Unable to load %s: %s", DLL_NAME, errmsg));
            return status;
        }

        GET_PROC(BEINITSTREAM, beInitStream);
        GET_PROC(BEENCODECHUNK, beEncodeChunk);
        GET_PROC(BEDEINITSTREAM, beDeinitStream);
        GET_PROC(BECLOSESTREAM, beCloseStream);
        GET_PROC(BEVERSION, beVersion);
        GET_PROC(BEWRITEVBRHEADER, beWriteVBRHeader);
        GET_PROC(BEWRITEINFOTAG, beWriteInfoTag);

        #undef GET_PROC

        BladeDLL.beVersion(&beVersion);
        PJ_LOG(4,(THIS_FILE, "%s encoder v%d.%d loaded (%s)", DLL_NAME,
                  beVersion.byMajorVersion, beVersion.byMinorVersion,
                  beVersion.zHomepage));
    }
    ++BladeDLL.refCount;
    return PJ_SUCCESS;
}

/*
 * Decrement the reference counter of the DLL.
 */
static void deinit_blade_dll()
{
    --BladeDLL.refCount;
    if (BladeDLL.refCount == 0 && BladeDLL.hModule) {
        FreeLibrary(BladeDLL.hModule);
        BladeDLL.hModule = NULL;
        PJ_LOG(4,(THIS_FILE, "%s unloaded", DLL_NAME));
    }
}

#else

static pj_status_t init_blade_dll(void)
{
    PJ_LOG(1,(THIS_FILE, "Error: MP3 writer port only works on Windows for now"));
    return PJ_ENOTSUP;
}

static void deinit_blade_dll()
{
}
#endif



/*
 * Initialize MP3 encoder.
 */
static pj_status_t init_mp3_encoder(struct mp3_file_port *fport,
                                    pj_pool_t *pool)
{
    BE_CONFIG LConfig;
    unsigned  long InSamples;
    unsigned  long OutBuffSize;
    long MP3Err;

    /*
     * Initialize encoder configuration.
     */
    pj_bzero(&LConfig, sizeof(BE_CONFIG));
    LConfig.dwConfig = BE_CONFIG_LAME;
    LConfig.format.LHV1.dwStructVersion = 1;
    LConfig.format.LHV1.dwStructSize = sizeof(BE_CONFIG);
    LConfig.format.LHV1.dwSampleRate = PJMEDIA_PIA_SRATE(&fport->base.info);
    LConfig.format.LHV1.dwReSampleRate = 0;

    if (PJMEDIA_PIA_CCNT(&fport->base.info)==1)
        LConfig.format.LHV1.nMode = BE_MP3_MODE_MONO;
    else if (PJMEDIA_PIA_CCNT(&fport->base.info)==2)
        LConfig.format.LHV1.nMode = BE_MP3_MODE_STEREO;
    else
        return PJMEDIA_ENCCHANNEL;

    LConfig.format.LHV1.dwBitrate = fport->mp3_option.bit_rate / 1000;
    LConfig.format.LHV1.nPreset = LQP_NOPRESET;
    LConfig.format.LHV1.bCopyright = 0;
    LConfig.format.LHV1.bCRC = 1;
    LConfig.format.LHV1.bOriginal = 1;
    LConfig.format.LHV1.bPrivate = 0;

    if (!fport->mp3_option.vbr) {
        LConfig.format.LHV1.nVbrMethod = VBR_METHOD_NONE;
        LConfig.format.LHV1.bWriteVBRHeader = 0;
        LConfig.format.LHV1.bEnableVBR = 0;
    } else {
        LConfig.format.LHV1.nVbrMethod = VBR_METHOD_DEFAULT;
        LConfig.format.LHV1.bWriteVBRHeader = 1;
        LConfig.format.LHV1.dwVbrAbr_bps = fport->mp3_option.bit_rate;
        LConfig.format.LHV1.nVBRQuality =  (pj_uint16_t)
                                           fport->mp3_option.quality;
        LConfig.format.LHV1.bEnableVBR = 1;
    }

    LConfig.format.LHV1.nQuality = (pj_uint16_t) 
                                   (((0-fport->mp3_option.quality-1)<<8) | 
                                    fport->mp3_option.quality);

    /*
     * Init MP3 stream.
     */
    InSamples = 0;
    MP3Err = BladeDLL.beInitStream(&LConfig, &InSamples, &OutBuffSize,
                                   &fport->mp3_stream);
    if (MP3Err != BE_ERR_SUCCESSFUL) 
        return PJMEDIA_ERROR;

    /*
     * Allocate sample buffer.
     */
    fport->mp3_samples_per_frame = (unsigned)InSamples;
    fport->mp3_sample_buf = pj_pool_alloc(pool, fport->mp3_samples_per_frame * 2);
    if (!fport->mp3_sample_buf)
        return PJ_ENOMEM;

    /*
     * Allocate encoded MP3 buffer.
     */
    fport->mp3_buf = pj_pool_alloc(pool, (pj_size_t)OutBuffSize);
    if (fport->mp3_buf == NULL)
        return PJ_ENOMEM;

    
    return PJ_SUCCESS;
}


/*
 * Create MP3 file writer port.
 */
PJ_DEF(pj_status_t) 
pjmedia_mp3_writer_port_create( pj_pool_t *pool,
                                const char *filename,
                                unsigned sampling_rate,
                                unsigned channel_count,
                                unsigned samples_per_frame,
                                unsigned bits_per_sample,
                                const pjmedia_mp3_encoder_option *param_option,
                                pjmedia_port **p_port )
{
    struct mp3_file_port *fport;
    pj_status_t status;

    status = init_blade_dll();
    if (status != PJ_SUCCESS)
        return status;

    /* Check arguments. */
    PJ_ASSERT_RETURN(pool && filename && p_port, PJ_EINVAL);

    /* Only supports 16bits per sample for now. */
    PJ_ASSERT_RETURN(bits_per_sample == 16, PJ_EINVAL);

    /* Create file port instance. */
    fport = pj_pool_zalloc(pool, sizeof(struct mp3_file_port));
    PJ_ASSERT_RETURN(fport != NULL, PJ_ENOMEM);

    /* Initialize port info. */
    pj_strdup2_with_null(pool, &fport->mp3_filename, filename);
    pjmedia_port_info_init(&fport->base.info, &fport->mp3_filename, SIGNATURE,
                           sampling_rate, channel_count, bits_per_sample,
                           samples_per_frame);

    fport->base.get_frame = &file_get_frame;
    fport->base.put_frame = &file_put_frame;
    fport->base.on_destroy = &file_on_destroy;


    /* Open file in write and read mode.
     * We need the read mode because we'll modify the WAVE header once
     * the recording has completed.
     */
    status = pj_file_open(pool, filename, PJ_O_WRONLY, &fport->fd);
    if (status != PJ_SUCCESS) {
        deinit_blade_dll();
        return status;
    }

    /* Copy and initialize option with default settings */
    if (param_option) {
        pj_memcpy(&fport->mp3_option, param_option, 
                   sizeof(pjmedia_mp3_encoder_option));
    } else {
        pj_bzero(&fport->mp3_option, sizeof(pjmedia_mp3_encoder_option));
        fport->mp3_option.vbr = PJ_TRUE;
    }

    /* Calculate bitrate if it's not specified, only if it's not VBR. */
    if (fport->mp3_option.bit_rate == 0 && !fport->mp3_option.vbr) 
        fport->mp3_option.bit_rate = sampling_rate * channel_count;

    /* Set default quality if it's not specified */
    if (fport->mp3_option.quality == 0) 
        fport->mp3_option.quality = 2;

    /* Init mp3 encoder */
    status = init_mp3_encoder(fport, pool);
    if (status != PJ_SUCCESS) {
        pj_file_close(fport->fd);
        deinit_blade_dll();
        return status;
    }

    /* Done. */
    *p_port = &fport->base;

    PJ_LOG(4,(THIS_FILE, 
              "MP3 file writer '%.*s' created: samp.rate=%dKHz, "
              "bitrate=%dkbps%s, quality=%d",
              (int)fport->base.info.name.slen,
              fport->base.info.name.ptr,
                  PJMEDIA_PIA_SRATE(&fport->base.info),
              fport->mp3_option.bit_rate/1000,
              (fport->mp3_option.vbr ? " (VBR)" : ""),
              fport->mp3_option.quality));

    return PJ_SUCCESS;
}


#if !DEPRECATED_FOR_TICKET_2251
/*
 * Register callback.
 */
PJ_DEF(pj_status_t) 
pjmedia_mp3_writer_port_set_cb( pjmedia_port *port,
                                pj_size_t pos,
                                void *user_data,
                                pj_status_t (*cb)(pjmedia_port *port,
                                                  void *usr_data))
{
    struct mp3_file_port *fport;

    /* Sanity check */
    PJ_ASSERT_RETURN(port && cb, PJ_EINVAL);

    /* Check that this is really a writer port */
    PJ_ASSERT_RETURN(port->info.signature == SIGNATURE, PJ_EINVALIDOP);

    PJ_LOG(1, (THIS_FILE, "pjmedia_mp3_writer_port_set_cb() is deprecated. "
               "Use pjmedia_mp3_writer_port_set_cb2() instead."));

    fport = (struct mp3_file_port*) port;

    fport->cb_size = pos;
    fport->base.port_data.pdata = user_data;
    fport->cb = cb;

    return PJ_SUCCESS;

}
#endif


/*
 * Register callback.
 */
PJ_DEF(pj_status_t) 
pjmedia_mp3_writer_port_set_cb2(pjmedia_port *port,
                                pj_size_t pos,
                                void *user_data,
                                void (*cb)(pjmedia_port *port,
                                           void *usr_data))
{
    struct mp3_file_port *fport;

    /* Sanity check */
    PJ_ASSERT_RETURN(port && cb, PJ_EINVAL);

    /* Check that this is really a writer port */
    PJ_ASSERT_RETURN(port->info.signature == SIGNATURE, PJ_EINVALIDOP);

    fport = (struct mp3_file_port*) port;

    fport->cb_size = pos;
    fport->base.port_data.pdata = user_data;
    fport->cb2 = cb;
    fport->cb_called = PJ_FALSE;

    return PJ_SUCCESS;

}


static pj_status_t file_on_event(pjmedia_event *event,
                                 void *user_data)
{
    struct file_port *fport = (struct file_port*)user_data;

    if (event->type == PJMEDIA_EVENT_CALLBACK) {
        if (fport->cb2)
            (*fport->cb2)(&fport->base, fport->base.port_data.pdata);
    }
    
    return PJ_SUCCESS;
}


/*
 * Put a frame into the buffer. When the buffer is full, flush the buffer
 * to the file.
 */
static pj_status_t file_put_frame(pjmedia_port *this_port, 
                                  const pjmedia_frame *frame)
{
    struct mp3_file_port *fport = (struct mp3_file_port *)this_port;
    unsigned long MP3Err;
    pj_ssize_t  bytes;
    pj_status_t status;
    unsigned long WriteSize;

    /* Record silence if input is no-frame */
    if (frame->type == PJMEDIA_FRAME_TYPE_NONE || frame->size == 0) {
        unsigned samples_left = PJMEDIA_PIA_SPF(&fport->base.info);
        unsigned samples_copied = 0;

        /* Only want to record at most 1 second of silence */
        if (fport->silence_duration >= PJMEDIA_PIA_SRATE(&fport->base.info))
            return PJ_SUCCESS;

        while (samples_left) {
            unsigned samples_needed = fport->mp3_samples_per_frame -
                                      fport->mp3_sample_pos;
            if (samples_needed > samples_left)
                samples_needed = samples_left;

            pjmedia_zero_samples(fport->mp3_sample_buf + fport->mp3_sample_pos,
                                 samples_needed);
            fport->mp3_sample_pos += samples_needed;
            samples_left -= samples_needed;
            samples_copied += samples_needed;

            /* Encode if we have full frame */
            if (fport->mp3_sample_pos == fport->mp3_samples_per_frame) {
                
                /* Clear position */
                fport->mp3_sample_pos = 0;

                /* Encode ! */
                MP3Err = BladeDLL.beEncodeChunk(fport->mp3_stream,
                                                fport->mp3_samples_per_frame,
                                                fport->mp3_sample_buf, 
                                                fport->mp3_buf, 
                                                &WriteSize);
                if (MP3Err != BE_ERR_SUCCESSFUL)
                    return PJMEDIA_ERROR;

                /* Write the chunk */
                bytes = WriteSize;
                status = pj_file_write(fport->fd, fport->mp3_buf, &bytes);
                if (status != PJ_SUCCESS)
                    return status;

                /* Increment total written. */
                fport->total += bytes;
            }
        }

        fport->silence_duration += PJMEDIA_PIA_SPF(&fport->base.info);

    }
    /* If encoder is expecting different sample size, then we need to
     * buffer the samples.
     */
    else if (fport->mp3_samples_per_frame != 
             PJMEDIA_PIA_SPF(&fport->base.info)) 
    {
        unsigned samples_left = frame->size / 2;
        unsigned samples_copied = 0;
        const pj_int16_t *src_samples = frame->buf;

        fport->silence_duration = 0;

        while (samples_left) {
            unsigned samples_needed = fport->mp3_samples_per_frame -
                                      fport->mp3_sample_pos;
            if (samples_needed > samples_left)
                samples_needed = samples_left;

            pjmedia_copy_samples(fport->mp3_sample_buf + fport->mp3_sample_pos,
                                 src_samples + samples_copied,
                                 samples_needed);
            fport->mp3_sample_pos += samples_needed;
            samples_left -= samples_needed;
            samples_copied += samples_needed;

            /* Encode if we have full frame */
            if (fport->mp3_sample_pos == fport->mp3_samples_per_frame) {
                
                /* Clear position */
                fport->mp3_sample_pos = 0;

                /* Encode ! */
                MP3Err = BladeDLL.beEncodeChunk(fport->mp3_stream,
                                                fport->mp3_samples_per_frame,
                                                fport->mp3_sample_buf, 
                                                fport->mp3_buf, 
                                                &WriteSize);
                if (MP3Err != BE_ERR_SUCCESSFUL)
                    return PJMEDIA_ERROR;

                /* Write the chunk */
                bytes = WriteSize;
                status = pj_file_write(fport->fd, fport->mp3_buf, &bytes);
                if (status != PJ_SUCCESS)
                    return status;

                /* Increment total written. */
                fport->total += bytes;
            }
        }

    } else {

        fport->silence_duration = 0;

        /* Encode ! */
        MP3Err = BladeDLL.beEncodeChunk(fport->mp3_stream,
                                        fport->mp3_samples_per_frame,
                                        frame->buf, 
                                        fport->mp3_buf, 
                                        &WriteSize);
        if (MP3Err != BE_ERR_SUCCESSFUL)
            return PJMEDIA_ERROR;

        /* Write the chunk */
        bytes = WriteSize;
        status = pj_file_write(fport->fd, fport->mp3_buf, &bytes);
        if (status != PJ_SUCCESS)
            return status;

        /* Increment total written. */
        fport->total += bytes;
    }

    /* Check if we need to call callback */
    if (fport->total >= fport->cb_size) {
        if (fport->cb2) {
            if (!fport->subscribed) {
                pj_status_t status;

                status = pjmedia_event_subscribe(NULL, &file_on_event,
                                                 fport, fport);
                fport->subscribed = (status == PJ_SUCCESS)? PJ_TRUE:
                                    PJ_FALSE;
            }

            if (fport->subscribed && !fport->cb_called) {
                pjmedia_event event;

                /* To prevent the callback from being called more than once. */
                fport->cb_called = PJ_TRUE;

                pjmedia_event_init(&event, PJMEDIA_EVENT_CALLBACK,
                                   NULL, fport);
                pjmedia_event_publish(NULL, fport, &event,
                                      PJMEDIA_EVENT_PUBLISH_POST_EVENT);
            }
        } else if (fport->cb) {
            pj_status_t (*cb)(pjmedia_port*, void*);
            pj_status_t status;

            cb = fport->cb;
            fport->cb = NULL;

            status = (*cb)(this_port, this_port->port_data.pdata);
            return status;
        }
    }

    return PJ_SUCCESS;
}

/*
 * Get frame, basicy is a no-op operation.
 */
static pj_status_t file_get_frame(pjmedia_port *this_port, 
                                  pjmedia_frame *frame)
{
    PJ_UNUSED_ARG(this_port);
    PJ_UNUSED_ARG(frame);
    return PJ_EINVALIDOP;
}


/*
 * Close the port, modify file header with updated file length.
 */
static pj_status_t file_on_destroy(pjmedia_port *this_port)
{
    struct mp3_file_port *fport = (struct mp3_file_port*)this_port;
    pj_status_t status;
    unsigned long WriteSize;
    unsigned long MP3Err;

    if (fport->subscribed) {
        pjmedia_event_unsubscribe(NULL, &file_on_event, fport, fport);
        fport->subscribed = PJ_FALSE;
    }

    /* Close encoder */
    MP3Err = BladeDLL.beDeinitStream(fport->mp3_stream, fport->mp3_buf, 
                                     &WriteSize);
    if (MP3Err == BE_ERR_SUCCESSFUL) {
        pj_ssize_t bytes = WriteSize;
        status = pj_file_write(fport->fd, fport->mp3_buf, &bytes);
    }

    /* Close file */
    status = pj_file_close(fport->fd);

    /* Write additional VBR header */
    if (fport->mp3_option.vbr) {
        MP3Err = BladeDLL.beWriteVBRHeader(fport->mp3_filename.ptr);
    }


    /* Decrement DLL reference counter */
    deinit_blade_dll();

    /* Done. */
    return PJ_SUCCESS;
}

