lavfi: add flite audio source

1 files changed, 274 insertions, 0 deletions

diff --git a/libavfilter/asrc_flite.c b/libavfilter/asrc_flite.c
new file mode 100644
index 0000000000..92263996ea
--- /dev/null
+++ b/libavfilter/asrc_flite.c
@@ -0,0 +1,274 @@
+/*
+ * 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 <flite/flite.h>
+#include "libavutil/audioconvert.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;
+    int64_t pts;
+    int frame_nb_samples; ///< number of samples per frame
+} FliteContext;
+
+#define OFFSET(x) offsetof(FliteContext, x)
+
+static const AVOption flite_options[] = {
+    { "list_voices", "list voices and exit",              OFFSET(list_voices), AV_OPT_TYPE_INT, {.dbl=0}, 0, 1 },
+    { "nb_samples",  "set number of samples per frame",   OFFSET(frame_nb_samples), AV_OPT_TYPE_INT, {.dbl=512}, 0, INT_MAX },
+    { "n",           "set number of samples per frame",   OFFSET(frame_nb_samples), AV_OPT_TYPE_INT, {.dbl=512}, 0, INT_MAX },
+    { "text",        "set text to speak",                 OFFSET(text),      AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX },
+    { "textfile",    "set filename of the text to speak", OFFSET(textfile),  AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX },
+    { "v",           "set voice",                         OFFSET(voice_str), AV_OPT_TYPE_STRING, {.str="kal"}, CHAR_MIN, CHAR_MAX },
+    { "voice",       "set voice",                         OFFSET(voice_str), AV_OPT_TYPE_STRING, {.str="kal"}, CHAR_MIN, CHAR_MAX },
+    { 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 *)
+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 *);
+} voice_entry;
+
+static struct voice_entry voice_entries[] = {
+    { "awb",   register_cmu_us_awb },
+    { "kal",   register_cmu_us_kal },
+    { "kal16", register_cmu_us_kal16 },
+    { "rms",   register_cmu_us_rms },
+    { "slt",   register_cmu_us_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(cst_voice **voice, 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)) {
+            *voice = entry->register_fn(NULL);
+            if (!*voice) {
+                av_log(log_ctx, AV_LOG_ERROR,
+                       "Could not register voice '%s'\n", voice_name);
+                return AVERROR_UNKNOWN;
+            }
+            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, const char *args)
+{
+    FliteContext *flite = ctx->priv;
+    int ret = 0;
+
+    flite->class = &flite_class;
+    av_opt_set_defaults(flite);
+
+    if ((ret = av_set_options_string(flite, args, "=", ":")) < 0) {
+        av_log(ctx, AV_LOG_ERROR, "Error parsing options string: '%s'\n", args);
+        return ret;
+    }
+
+    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, flite->voice_str, ctx)) < 0)
+        return ret;
+
+    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;
+
+    av_opt_free(flite);
+
+    delete_voice(flite->voice);
+    flite->voice = 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)
+{
+    AVFilterBufferRef *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, AV_PERM_WRITE, 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;
+    samplesref->pos = -1;
+    samplesref->audio->sample_rate = 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_samples(outlink, samplesref);
+}
+
+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 = (const AVFilterPad[]) {{ .name = NULL}},
+
+    .outputs = (const AVFilterPad[]) {
+        {
+            .name = "default",
+            .type = AVMEDIA_TYPE_AUDIO,
+            .config_props = config_props,
+            .request_frame = request_frame,
+        },
+        { .name = NULL }
+    },
+};