| /* |
| * Copyright (c) 2011 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 |
| * eval audio source |
| */ |
| |
| #include "libavutil/avassert.h" |
| #include "libavutil/avstring.h" |
| #include "libavutil/channel_layout.h" |
| #include "libavutil/eval.h" |
| #include "libavutil/opt.h" |
| #include "libavutil/parseutils.h" |
| #include "avfilter.h" |
| #include "audio.h" |
| #include "internal.h" |
| |
| static const char * const var_names[] = { |
| "ch", ///< the value of the current channel |
| "n", ///< number of frame |
| "nb_in_channels", |
| "nb_out_channels", |
| "t", ///< timestamp expressed in seconds |
| "s", ///< sample rate |
| NULL |
| }; |
| |
| enum var_name { |
| VAR_CH, |
| VAR_N, |
| VAR_NB_IN_CHANNELS, |
| VAR_NB_OUT_CHANNELS, |
| VAR_T, |
| VAR_S, |
| VAR_VARS_NB |
| }; |
| |
| typedef struct { |
| const AVClass *class; |
| char *sample_rate_str; |
| int sample_rate; |
| int64_t chlayout; |
| char *chlayout_str; |
| int nb_channels; ///< number of output channels |
| int nb_in_channels; ///< number of input channels |
| int same_chlayout; ///< set output as input channel layout |
| int64_t pts; |
| AVExpr **expr; |
| char *exprs; |
| int nb_samples; ///< number of samples per requested frame |
| int64_t duration; |
| uint64_t n; |
| double var_values[VAR_VARS_NB]; |
| double *channel_values; |
| int64_t out_channel_layout; |
| } EvalContext; |
| |
| static double val(void *priv, double ch) |
| { |
| EvalContext *eval = priv; |
| return eval->channel_values[FFMIN((int)ch, eval->nb_in_channels-1)]; |
| } |
| |
| static double (* const aeval_func1[])(void *, double) = { val, NULL }; |
| static const char * const aeval_func1_names[] = { "val", NULL }; |
| |
| #define OFFSET(x) offsetof(EvalContext, x) |
| #define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM |
| |
| static const AVOption aevalsrc_options[]= { |
| { "exprs", "set the '|'-separated list of channels expressions", OFFSET(exprs), AV_OPT_TYPE_STRING, {.str = NULL}, .flags = FLAGS }, |
| { "nb_samples", "set the number of samples per requested frame", OFFSET(nb_samples), AV_OPT_TYPE_INT, {.i64 = 1024}, 0, INT_MAX, FLAGS }, |
| { "n", "set the number of samples per requested frame", OFFSET(nb_samples), AV_OPT_TYPE_INT, {.i64 = 1024}, 0, INT_MAX, FLAGS }, |
| { "sample_rate", "set the sample rate", OFFSET(sample_rate_str), AV_OPT_TYPE_STRING, {.str = "44100"}, CHAR_MIN, CHAR_MAX, FLAGS }, |
| { "s", "set the sample rate", OFFSET(sample_rate_str), AV_OPT_TYPE_STRING, {.str = "44100"}, CHAR_MIN, CHAR_MAX, FLAGS }, |
| { "duration", "set audio duration", OFFSET(duration), AV_OPT_TYPE_DURATION, {.i64 = -1}, -1, INT64_MAX, FLAGS }, |
| { "d", "set audio duration", OFFSET(duration), AV_OPT_TYPE_DURATION, {.i64 = -1}, -1, INT64_MAX, FLAGS }, |
| { "channel_layout", "set channel layout", OFFSET(chlayout_str), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, FLAGS }, |
| { "c", "set channel layout", OFFSET(chlayout_str), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, FLAGS }, |
| { NULL } |
| }; |
| |
| AVFILTER_DEFINE_CLASS(aevalsrc); |
| |
| static int parse_channel_expressions(AVFilterContext *ctx, |
| int expected_nb_channels) |
| { |
| EvalContext *eval = ctx->priv; |
| char *args1 = av_strdup(eval->exprs); |
| char *expr, *last_expr = NULL, *buf; |
| double (* const *func1)(void *, double) = NULL; |
| const char * const *func1_names = NULL; |
| int i, ret = 0; |
| |
| if (!args1) |
| return AVERROR(ENOMEM); |
| |
| if (!eval->exprs) { |
| av_log(ctx, AV_LOG_ERROR, "Channels expressions list is empty\n"); |
| return AVERROR(EINVAL); |
| } |
| |
| if (!strcmp(ctx->filter->name, "aeval")) { |
| func1 = aeval_func1; |
| func1_names = aeval_func1_names; |
| } |
| |
| #define ADD_EXPRESSION(expr_) do { \ |
| if (!av_dynarray2_add((void **)&eval->expr, &eval->nb_channels, \ |
| sizeof(*eval->expr), NULL)) { \ |
| ret = AVERROR(ENOMEM); \ |
| goto end; \ |
| } \ |
| eval->expr[eval->nb_channels-1] = NULL; \ |
| ret = av_expr_parse(&eval->expr[eval->nb_channels - 1], expr_, \ |
| var_names, func1_names, func1, \ |
| NULL, NULL, 0, ctx); \ |
| if (ret < 0) \ |
| goto end; \ |
| } while (0) |
| |
| /* reset expressions */ |
| for (i = 0; i < eval->nb_channels; i++) { |
| av_expr_free(eval->expr[i]); |
| eval->expr[i] = NULL; |
| } |
| av_freep(&eval->expr); |
| eval->nb_channels = 0; |
| |
| buf = args1; |
| while (expr = av_strtok(buf, "|", &buf)) { |
| ADD_EXPRESSION(expr); |
| last_expr = expr; |
| } |
| |
| if (expected_nb_channels > eval->nb_channels) |
| for (i = eval->nb_channels; i < expected_nb_channels; i++) |
| ADD_EXPRESSION(last_expr); |
| |
| if (expected_nb_channels > 0 && eval->nb_channels != expected_nb_channels) { |
| av_log(ctx, AV_LOG_ERROR, |
| "Mismatch between the specified number of channel expressions '%d' " |
| "and the number of expected output channels '%d' for the specified channel layout\n", |
| eval->nb_channels, expected_nb_channels); |
| ret = AVERROR(EINVAL); |
| goto end; |
| } |
| |
| end: |
| av_free(args1); |
| return ret; |
| } |
| |
| static av_cold int init(AVFilterContext *ctx) |
| { |
| EvalContext *eval = ctx->priv; |
| int ret = 0; |
| |
| if (eval->chlayout_str) { |
| if (!strcmp(eval->chlayout_str, "same") && !strcmp(ctx->filter->name, "aeval")) { |
| eval->same_chlayout = 1; |
| } else { |
| ret = ff_parse_channel_layout(&eval->chlayout, NULL, eval->chlayout_str, ctx); |
| if (ret < 0) |
| return ret; |
| |
| ret = parse_channel_expressions(ctx, av_get_channel_layout_nb_channels(eval->chlayout)); |
| if (ret < 0) |
| return ret; |
| } |
| } else { |
| /* guess channel layout from nb expressions/channels */ |
| if ((ret = parse_channel_expressions(ctx, -1)) < 0) |
| return ret; |
| |
| eval->chlayout = av_get_default_channel_layout(eval->nb_channels); |
| if (!eval->chlayout && eval->nb_channels <= 0) { |
| av_log(ctx, AV_LOG_ERROR, "Invalid number of channels '%d' provided\n", |
| eval->nb_channels); |
| return AVERROR(EINVAL); |
| } |
| } |
| |
| if (eval->sample_rate_str) |
| if ((ret = ff_parse_sample_rate(&eval->sample_rate, eval->sample_rate_str, ctx))) |
| return ret; |
| eval->n = 0; |
| |
| return ret; |
| } |
| |
| static av_cold void uninit(AVFilterContext *ctx) |
| { |
| EvalContext *eval = ctx->priv; |
| int i; |
| |
| for (i = 0; i < eval->nb_channels; i++) { |
| av_expr_free(eval->expr[i]); |
| eval->expr[i] = NULL; |
| } |
| av_freep(&eval->expr); |
| av_freep(&eval->channel_values); |
| } |
| |
| static int config_props(AVFilterLink *outlink) |
| { |
| EvalContext *eval = outlink->src->priv; |
| char buf[128]; |
| |
| outlink->time_base = (AVRational){1, eval->sample_rate}; |
| outlink->sample_rate = eval->sample_rate; |
| |
| eval->var_values[VAR_S] = eval->sample_rate; |
| eval->var_values[VAR_NB_IN_CHANNELS] = NAN; |
| eval->var_values[VAR_NB_OUT_CHANNELS] = outlink->channels; |
| |
| av_get_channel_layout_string(buf, sizeof(buf), 0, eval->chlayout); |
| |
| av_log(outlink->src, AV_LOG_VERBOSE, |
| "sample_rate:%d chlayout:%s duration:%"PRId64"\n", |
| eval->sample_rate, buf, eval->duration); |
| |
| return 0; |
| } |
| |
| static int query_formats(AVFilterContext *ctx) |
| { |
| EvalContext *eval = ctx->priv; |
| static const enum AVSampleFormat sample_fmts[] = { AV_SAMPLE_FMT_DBLP, AV_SAMPLE_FMT_NONE }; |
| int64_t chlayouts[] = { eval->chlayout ? eval->chlayout : FF_COUNT2LAYOUT(eval->nb_channels) , -1 }; |
| int sample_rates[] = { eval->sample_rate, -1 }; |
| AVFilterFormats *formats; |
| AVFilterChannelLayouts *layouts; |
| int ret; |
| |
| formats = ff_make_format_list(sample_fmts); |
| if (!formats) |
| return AVERROR(ENOMEM); |
| ret = ff_set_common_formats (ctx, formats); |
| if (ret < 0) |
| return ret; |
| |
| layouts = avfilter_make_format64_list(chlayouts); |
| if (!layouts) |
| return AVERROR(ENOMEM); |
| ret = ff_set_common_channel_layouts(ctx, layouts); |
| if (ret < 0) |
| return ret; |
| |
| formats = ff_make_format_list(sample_rates); |
| if (!formats) |
| return AVERROR(ENOMEM); |
| return ff_set_common_samplerates(ctx, formats); |
| } |
| |
| static int request_frame(AVFilterLink *outlink) |
| { |
| EvalContext *eval = outlink->src->priv; |
| AVFrame *samplesref; |
| int i, j; |
| int64_t t = av_rescale(eval->n, AV_TIME_BASE, eval->sample_rate); |
| |
| if (eval->duration >= 0 && t >= eval->duration) |
| return AVERROR_EOF; |
| |
| samplesref = ff_get_audio_buffer(outlink, eval->nb_samples); |
| if (!samplesref) |
| return AVERROR(ENOMEM); |
| |
| /* evaluate expression for each single sample and for each channel */ |
| for (i = 0; i < eval->nb_samples; i++, eval->n++) { |
| eval->var_values[VAR_N] = eval->n; |
| eval->var_values[VAR_T] = eval->var_values[VAR_N] * (double)1/eval->sample_rate; |
| |
| for (j = 0; j < eval->nb_channels; j++) { |
| *((double *) samplesref->extended_data[j] + i) = |
| av_expr_eval(eval->expr[j], eval->var_values, NULL); |
| } |
| } |
| |
| samplesref->pts = eval->pts; |
| samplesref->sample_rate = eval->sample_rate; |
| eval->pts += eval->nb_samples; |
| |
| return ff_filter_frame(outlink, samplesref); |
| } |
| |
| #if CONFIG_AEVALSRC_FILTER |
| static const AVFilterPad aevalsrc_outputs[] = { |
| { |
| .name = "default", |
| .type = AVMEDIA_TYPE_AUDIO, |
| .config_props = config_props, |
| .request_frame = request_frame, |
| }, |
| { NULL } |
| }; |
| |
| AVFilter ff_asrc_aevalsrc = { |
| .name = "aevalsrc", |
| .description = NULL_IF_CONFIG_SMALL("Generate an audio signal generated by an expression."), |
| .query_formats = query_formats, |
| .init = init, |
| .uninit = uninit, |
| .priv_size = sizeof(EvalContext), |
| .inputs = NULL, |
| .outputs = aevalsrc_outputs, |
| .priv_class = &aevalsrc_class, |
| }; |
| |
| #endif /* CONFIG_AEVALSRC_FILTER */ |
| |
| #define OFFSET(x) offsetof(EvalContext, x) |
| #define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM |
| |
| static const AVOption aeval_options[]= { |
| { "exprs", "set the '|'-separated list of channels expressions", OFFSET(exprs), AV_OPT_TYPE_STRING, {.str = NULL}, .flags = FLAGS }, |
| { "channel_layout", "set channel layout", OFFSET(chlayout_str), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, FLAGS }, |
| { "c", "set channel layout", OFFSET(chlayout_str), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, FLAGS }, |
| { NULL } |
| }; |
| |
| AVFILTER_DEFINE_CLASS(aeval); |
| |
| static int aeval_query_formats(AVFilterContext *ctx) |
| { |
| AVFilterFormats *formats = NULL; |
| AVFilterChannelLayouts *layouts; |
| AVFilterLink *inlink = ctx->inputs[0]; |
| AVFilterLink *outlink = ctx->outputs[0]; |
| EvalContext *eval = ctx->priv; |
| static const enum AVSampleFormat sample_fmts[] = { |
| AV_SAMPLE_FMT_DBLP, AV_SAMPLE_FMT_NONE |
| }; |
| int ret; |
| |
| // inlink supports any channel layout |
| layouts = ff_all_channel_counts(); |
| if ((ret = ff_channel_layouts_ref(layouts, &inlink->out_channel_layouts)) < 0) |
| return ret; |
| |
| if (eval->same_chlayout) { |
| layouts = ff_all_channel_counts(); |
| if ((ret = ff_set_common_channel_layouts(ctx, layouts)) < 0) |
| return ret; |
| } else { |
| // outlink supports only requested output channel layout |
| layouts = NULL; |
| if ((ret = ff_add_channel_layout(&layouts, |
| eval->out_channel_layout ? eval->out_channel_layout : |
| FF_COUNT2LAYOUT(eval->nb_channels))) < 0) |
| return ret; |
| if ((ret = ff_channel_layouts_ref(layouts, &outlink->in_channel_layouts)) < 0) |
| return ret; |
| } |
| |
| formats = ff_make_format_list(sample_fmts); |
| if ((ret = ff_set_common_formats(ctx, formats)) < 0) |
| return ret; |
| |
| formats = ff_all_samplerates(); |
| return ff_set_common_samplerates(ctx, formats); |
| } |
| |
| static int aeval_config_output(AVFilterLink *outlink) |
| { |
| AVFilterContext *ctx = outlink->src; |
| EvalContext *eval = ctx->priv; |
| AVFilterLink *inlink = ctx->inputs[0]; |
| int ret; |
| |
| if (eval->same_chlayout) { |
| eval->chlayout = inlink->channel_layout; |
| |
| if ((ret = parse_channel_expressions(ctx, inlink->channels)) < 0) |
| return ret; |
| } |
| |
| eval->n = 0; |
| eval->nb_in_channels = eval->var_values[VAR_NB_IN_CHANNELS] = inlink->channels; |
| eval->var_values[VAR_NB_OUT_CHANNELS] = outlink->channels; |
| eval->var_values[VAR_S] = inlink->sample_rate; |
| eval->var_values[VAR_T] = NAN; |
| |
| eval->channel_values = av_realloc_f(eval->channel_values, |
| inlink->channels, sizeof(*eval->channel_values)); |
| if (!eval->channel_values) |
| return AVERROR(ENOMEM); |
| |
| return 0; |
| } |
| |
| #define TS2T(ts, tb) ((ts) == AV_NOPTS_VALUE ? NAN : (double)(ts)*av_q2d(tb)) |
| |
| static int filter_frame(AVFilterLink *inlink, AVFrame *in) |
| { |
| EvalContext *eval = inlink->dst->priv; |
| AVFilterLink *outlink = inlink->dst->outputs[0]; |
| int nb_samples = in->nb_samples; |
| AVFrame *out; |
| double t0; |
| int i, j; |
| |
| /* do volume scaling in-place if input buffer is writable */ |
| out = ff_get_audio_buffer(outlink, nb_samples); |
| if (!out) |
| return AVERROR(ENOMEM); |
| av_frame_copy_props(out, in); |
| |
| t0 = TS2T(in->pts, inlink->time_base); |
| |
| /* evaluate expression for each single sample and for each channel */ |
| for (i = 0; i < nb_samples; i++, eval->n++) { |
| eval->var_values[VAR_N] = eval->n; |
| eval->var_values[VAR_T] = t0 + i * (double)1/inlink->sample_rate; |
| |
| for (j = 0; j < inlink->channels; j++) |
| eval->channel_values[j] = *((double *) in->extended_data[j] + i); |
| |
| for (j = 0; j < outlink->channels; j++) { |
| eval->var_values[VAR_CH] = j; |
| *((double *) out->extended_data[j] + i) = |
| av_expr_eval(eval->expr[j], eval->var_values, eval); |
| } |
| } |
| |
| av_frame_free(&in); |
| return ff_filter_frame(outlink, out); |
| } |
| |
| #if CONFIG_AEVAL_FILTER |
| |
| static const AVFilterPad aeval_inputs[] = { |
| { |
| .name = "default", |
| .type = AVMEDIA_TYPE_AUDIO, |
| .filter_frame = filter_frame, |
| }, |
| { NULL } |
| }; |
| |
| static const AVFilterPad aeval_outputs[] = { |
| { |
| .name = "default", |
| .type = AVMEDIA_TYPE_AUDIO, |
| .config_props = aeval_config_output, |
| }, |
| { NULL } |
| }; |
| |
| AVFilter ff_af_aeval = { |
| .name = "aeval", |
| .description = NULL_IF_CONFIG_SMALL("Filter audio signal according to a specified expression."), |
| .query_formats = aeval_query_formats, |
| .init = init, |
| .uninit = uninit, |
| .priv_size = sizeof(EvalContext), |
| .inputs = aeval_inputs, |
| .outputs = aeval_outputs, |
| .priv_class = &aeval_class, |
| }; |
| |
| #endif /* CONFIG_AEVAL_FILTER */ |