diff options
Diffstat (limited to 'libavfilter/asrc_flite.c')
-rw-r--r-- | libavfilter/asrc_flite.c | 283 |
1 files changed, 283 insertions, 0 deletions
diff --git a/libavfilter/asrc_flite.c b/libavfilter/asrc_flite.c new file mode 100644 index 0000000..098a1dd --- /dev/null +++ b/libavfilter/asrc_flite.c @@ -0,0 +1,283 @@ +/* + * 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/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 ff_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, +}; |