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/*

 * Copyright (c) 2012 Stefano Sabatini

 *

 * This file is part of FFmpeg.

 *

 * FFmpeg 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 2.1 of the License, or (at your option) any later version.

 *

 * FFmpeg 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 FFmpeg; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

 */

/**

 * @file

 * flite voice synth source

 */

#include 

#include "libavutil/channel_layout.h"

#include "libavutil/file.h"

#include "libavutil/opt.h"

#include "avfilter.h"

#include "audio.h"

#include "formats.h"

#include "internal.h"

typedef struct {

    const AVClass *class;

    char *voice_str;

    char *textfile;

    char *text;

    cst_wave *wave;

    int16_t *wave_samples;

    int      wave_nb_samples;

    int list_voices;

    cst_voice *voice;

    struct voice_entry *voice_entry;

    int64_t pts;

    int frame_nb_samples; ///< number of samples per frame

} FliteContext;

#define OFFSET(x) offsetof(FliteContext, x)

#define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM

static const AVOption flite_options[] = {

    { "list_voices", "list voices and exit",              OFFSET(list_voices), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS },

    { "nb_samples",  "set number of samples per frame",   OFFSET(frame_nb_samples), AV_OPT_TYPE_INT, {.i64=512}, 0, INT_MAX, FLAGS },

    { "n",           "set number of samples per frame",   OFFSET(frame_nb_samples), AV_OPT_TYPE_INT, {.i64=512}, 0, INT_MAX, FLAGS },

    { "text",        "set text to speak",                 OFFSET(text),      AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS },

    { "textfile",    "set filename of the text to speak", OFFSET(textfile),  AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS },

    { "v",           "set voice",                         OFFSET(voice_str), AV_OPT_TYPE_STRING, {.str="kal"}, CHAR_MIN, CHAR_MAX, FLAGS },

    { "voice",       "set voice",                         OFFSET(voice_str), AV_OPT_TYPE_STRING, {.str="kal"}, CHAR_MIN, CHAR_MAX, FLAGS },

    { NULL }

};

AVFILTER_DEFINE_CLASS(flite);

static volatile int flite_inited = 0;

/* declare functions for all the supported voices */

#define DECLARE_REGISTER_VOICE_FN(name) \

    cst_voice *register_cmu_us_## name(const char *); \

    void     unregister_cmu_us_## name(cst_voice *);

DECLARE_REGISTER_VOICE_FN(awb);

DECLARE_REGISTER_VOICE_FN(kal);

DECLARE_REGISTER_VOICE_FN(kal16);

DECLARE_REGISTER_VOICE_FN(rms);

DECLARE_REGISTER_VOICE_FN(slt);

struct voice_entry {

    const char *name;

    cst_voice * (*register_fn)(const char *);

    void (*unregister_fn)(cst_voice *);

    cst_voice *voice;

    unsigned usage_count;

} voice_entry;

#define MAKE_VOICE_STRUCTURE(voice_name) {             \

    .name          =                      #voice_name, \

    .register_fn   =   register_cmu_us_ ## voice_name, \

    .unregister_fn = unregister_cmu_us_ ## voice_name, \

}

static struct voice_entry voice_entries[] = {

    MAKE_VOICE_STRUCTURE(awb),

    MAKE_VOICE_STRUCTURE(kal),

    MAKE_VOICE_STRUCTURE(kal16),

    MAKE_VOICE_STRUCTURE(rms),

    MAKE_VOICE_STRUCTURE(slt),

};

static void list_voices(void *log_ctx, const char *sep)

{

    int i, n = FF_ARRAY_ELEMS(voice_entries);

    for (i = 0; i < n; i++)

        av_log(log_ctx, AV_LOG_INFO, "%s%s",

               voice_entries[i].name, i < (n-1) ? sep : "\n");

}

static int select_voice(struct voice_entry **entry_ret, const char *voice_name, void *log_ctx)

{

    int i;

    for (i = 0; i < FF_ARRAY_ELEMS(voice_entries); i++) {

        struct voice_entry *entry = &voice_entries[i];

        if (!strcmp(entry->name, voice_name)) {

            if (!entry->voice)

                entry->voice = entry->register_fn(NULL);

            if (!entry->voice) {

                av_log(log_ctx, AV_LOG_ERROR,

                       "Could not register voice '%s'\n", voice_name);

                return AVERROR_UNKNOWN;

            }

            entry->usage_count++;

            *entry_ret = entry;

            return 0;

        }

    }

    av_log(log_ctx, AV_LOG_ERROR, "Could not find voice '%s'\n", voice_name);

    av_log(log_ctx, AV_LOG_INFO, "Choose between the voices: ");

    list_voices(log_ctx, ", ");

    return AVERROR(EINVAL);

}

static av_cold int init(AVFilterContext *ctx)

{

    FliteContext *flite = ctx->priv;

    int ret = 0;

    if (flite->list_voices) {

        list_voices(ctx, "\n");

        return AVERROR_EXIT;

    }

    if (!flite_inited) {

        if (flite_init() < 0) {

            av_log(ctx, AV_LOG_ERROR, "flite initialization failed\n");

            return AVERROR_UNKNOWN;

        }

        flite_inited++;

    }

    if ((ret = select_voice(&flite->voice_entry, flite->voice_str, ctx)) < 0)

        return ret;

    flite->voice = flite->voice_entry->voice;

    if (flite->textfile && flite->text) {

        av_log(ctx, AV_LOG_ERROR,

               "Both text and textfile options set: only one must be specified\n");

        return AVERROR(EINVAL);

    }

    if (flite->textfile) {

        uint8_t *textbuf;

        size_t textbuf_size;

        if ((ret = av_file_map(flite->textfile, &textbuf, &textbuf_size, 0, ctx)) < 0) {

            av_log(ctx, AV_LOG_ERROR,

                   "The text file '%s' could not be read: %s\n",

                   flite->textfile, av_err2str(ret));

            return ret;

        }

        if (!(flite->text = av_malloc(textbuf_size+1)))

            return AVERROR(ENOMEM);

        memcpy(flite->text, textbuf, textbuf_size);

        flite->text[textbuf_size] = 0;

        av_file_unmap(textbuf, textbuf_size);

    }

    if (!flite->text) {

        av_log(ctx, AV_LOG_ERROR,

               "No speech text specified, specify the 'text' or 'textfile' option\n");

        return AVERROR(EINVAL);

    }

    /* synth all the file data in block */

    flite->wave = flite_text_to_wave(flite->text, flite->voice);

    flite->wave_samples    = flite->wave->samples;

    flite->wave_nb_samples = flite->wave->num_samples;

    return 0;

}

static av_cold void uninit(AVFilterContext *ctx)

{

    FliteContext *flite = ctx->priv;

    if (!--flite->voice_entry->usage_count)

        flite->voice_entry->unregister_fn(flite->voice);

    flite->voice = NULL;

    flite->voice_entry = NULL;

    delete_wave(flite->wave);

    flite->wave = NULL;

}

static int query_formats(AVFilterContext *ctx)

{

    FliteContext *flite = ctx->priv;

    AVFilterChannelLayouts *chlayouts = NULL;

    int64_t chlayout = av_get_default_channel_layout(flite->wave->num_channels);

    AVFilterFormats *sample_formats = NULL;

    AVFilterFormats *sample_rates = NULL;

    ff_add_channel_layout(&chlayouts, chlayout);

    ff_set_common_channel_layouts(ctx, chlayouts);

    ff_add_format(&sample_formats, AV_SAMPLE_FMT_S16);

    ff_set_common_formats(ctx, sample_formats);

    ff_add_format(&sample_rates, flite->wave->sample_rate);

    ff_set_common_samplerates (ctx, sample_rates);

    return 0;

}

static int config_props(AVFilterLink *outlink)

{

    AVFilterContext *ctx = outlink->src;

    FliteContext *flite = ctx->priv;

    outlink->sample_rate = flite->wave->sample_rate;

    outlink->time_base = (AVRational){1, flite->wave->sample_rate};

    av_log(ctx, AV_LOG_VERBOSE, "voice:%s fmt:%s sample_rate:%d\n",

           flite->voice_str,

           av_get_sample_fmt_name(outlink->format), outlink->sample_rate);

    return 0;

}

static int request_frame(AVFilterLink *outlink)

{

    AVFrame *samplesref;

    FliteContext *flite = outlink->src->priv;

    int nb_samples = FFMIN(flite->wave_nb_samples, flite->frame_nb_samples);

    if (!nb_samples)

        return AVERROR_EOF;

    samplesref = ff_get_audio_buffer(outlink, nb_samples);

    if (!samplesref)

        return AVERROR(ENOMEM);

    memcpy(samplesref->data[0], flite->wave_samples,

           nb_samples * flite->wave->num_channels * 2);

    samplesref->pts = flite->pts;

    av_frame_set_pkt_pos(samplesref, -1);

    av_frame_set_sample_rate(samplesref, flite->wave->sample_rate);

    flite->pts += nb_samples;

    flite->wave_samples += nb_samples * flite->wave->num_channels;

    flite->wave_nb_samples -= nb_samples;

    return ff_filter_frame(outlink, samplesref);

}

static const AVFilterPad flite_outputs[] = {

    {

        .name          = "default",

        .type          = AVMEDIA_TYPE_AUDIO,

        .config_props  = config_props,

        .request_frame = request_frame,

    },

    { NULL }

};

AVFilter avfilter_asrc_flite = {

    .name          = "flite",

    .description   = NULL_IF_CONFIG_SMALL("Synthesize voice from text using libflite."),

    .query_formats = query_formats,

    .init          = init,

    .uninit        = uninit,

    .priv_size     = sizeof(FliteContext),

    .inputs        = NULL,

    .outputs       = flite_outputs,

    .priv_class    = &flite_class,

};