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https://github.com/FFmpeg/FFmpeg.git
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b9c928a486
This flag allows distinguishing between filters that actually modify the data and those that only modify metadata or gather some stream information.
180 lines
5.7 KiB
C
180 lines
5.7 KiB
C
/*
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* Copyright (c) 2019 Paul B Mahol
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg 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 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg 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 FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <pocketsphinx/pocketsphinx.h>
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#include "libavutil/avstring.h"
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#include "libavutil/channel_layout.h"
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#include "libavutil/opt.h"
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#include "audio.h"
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#include "avfilter.h"
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#include "internal.h"
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typedef struct ASRContext {
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const AVClass *class;
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int rate;
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char *hmm;
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char *dict;
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char *lm;
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char *lmctl;
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char *lmname;
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char *logfn;
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ps_decoder_t *ps;
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cmd_ln_t *config;
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int utt_started;
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} ASRContext;
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#define OFFSET(x) offsetof(ASRContext, x)
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#define FLAGS AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_FILTERING_PARAM
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static const AVOption asr_options[] = {
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{ "rate", "set sampling rate", OFFSET(rate), AV_OPT_TYPE_INT, {.i64=16000}, 0, INT_MAX, .flags = FLAGS },
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{ "hmm", "set directory containing acoustic model files", OFFSET(hmm), AV_OPT_TYPE_STRING, {.str=NULL}, .flags = FLAGS },
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{ "dict", "set pronunciation dictionary", OFFSET(dict), AV_OPT_TYPE_STRING, {.str=NULL}, .flags = FLAGS },
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{ "lm", "set language model file", OFFSET(lm), AV_OPT_TYPE_STRING, {.str=NULL}, .flags = FLAGS },
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{ "lmctl", "set language model set", OFFSET(lmctl), AV_OPT_TYPE_STRING, {.str=NULL}, .flags = FLAGS },
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{ "lmname","set which language model to use", OFFSET(lmname), AV_OPT_TYPE_STRING, {.str=NULL}, .flags = FLAGS },
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{ "logfn", "set output for log messages", OFFSET(logfn), AV_OPT_TYPE_STRING, {.str="/dev/null"}, .flags = FLAGS },
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{ NULL }
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};
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AVFILTER_DEFINE_CLASS(asr);
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static int filter_frame(AVFilterLink *inlink, AVFrame *in)
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{
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AVFilterContext *ctx = inlink->dst;
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AVDictionary **metadata = &in->metadata;
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ASRContext *s = ctx->priv;
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int have_speech;
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const char *speech;
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ps_process_raw(s->ps, (const int16_t *)in->data[0], in->nb_samples, 0, 0);
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have_speech = ps_get_in_speech(s->ps);
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if (have_speech && !s->utt_started)
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s->utt_started = 1;
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if (!have_speech && s->utt_started) {
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ps_end_utt(s->ps);
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speech = ps_get_hyp(s->ps, NULL);
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if (speech != NULL)
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av_dict_set(metadata, "lavfi.asr.text", speech, 0);
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ps_start_utt(s->ps);
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s->utt_started = 0;
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}
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return ff_filter_frame(ctx->outputs[0], in);
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}
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static int config_input(AVFilterLink *inlink)
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{
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AVFilterContext *ctx = inlink->dst;
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ASRContext *s = ctx->priv;
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ps_start_utt(s->ps);
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return 0;
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}
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static av_cold int asr_init(AVFilterContext *ctx)
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{
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ASRContext *s = ctx->priv;
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const float frate = s->rate;
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char *rate = av_asprintf("%f", frate);
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const char *argv[] = { "-logfn", s->logfn,
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"-hmm", s->hmm,
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"-lm", s->lm,
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"-lmctl", s->lmctl,
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"-lmname", s->lmname,
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"-dict", s->dict,
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"-samprate", rate,
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NULL };
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s->config = cmd_ln_parse_r(NULL, ps_args(), 14, (char **)argv, 0);
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av_free(rate);
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if (!s->config)
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return AVERROR(ENOMEM);
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ps_default_search_args(s->config);
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s->ps = ps_init(s->config);
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if (!s->ps)
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return AVERROR(ENOMEM);
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return 0;
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}
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static int query_formats(AVFilterContext *ctx)
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{
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ASRContext *s = ctx->priv;
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int sample_rates[] = { s->rate, -1 };
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int ret;
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AVFilterFormats *formats = NULL;
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AVFilterChannelLayouts *layout = NULL;
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if ((ret = ff_add_format (&formats, AV_SAMPLE_FMT_S16 )) < 0 ||
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(ret = ff_set_common_formats (ctx , formats )) < 0 ||
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(ret = ff_add_channel_layout (&layout , AV_CH_LAYOUT_MONO )) < 0 ||
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(ret = ff_set_common_channel_layouts (ctx , layout )) < 0 ||
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(ret = ff_set_common_samplerates_from_list(ctx, sample_rates )) < 0)
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return ret;
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return 0;
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}
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static av_cold void asr_uninit(AVFilterContext *ctx)
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{
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ASRContext *s = ctx->priv;
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ps_free(s->ps);
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s->ps = NULL;
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cmd_ln_free_r(s->config);
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s->config = NULL;
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}
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static const AVFilterPad asr_inputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_AUDIO,
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.filter_frame = filter_frame,
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.config_props = config_input,
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},
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};
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static const AVFilterPad asr_outputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_AUDIO,
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},
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};
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const AVFilter ff_af_asr = {
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.name = "asr",
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.description = NULL_IF_CONFIG_SMALL("Automatic Speech Recognition."),
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.priv_size = sizeof(ASRContext),
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.priv_class = &asr_class,
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.init = asr_init,
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.uninit = asr_uninit,
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.flags = AVFILTER_FLAG_METADATA_ONLY,
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FILTER_INPUTS(asr_inputs),
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FILTER_OUTPUTS(asr_outputs),
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FILTER_QUERY_FUNC(query_formats),
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};
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