diff options
Diffstat (limited to 'libavfilter/f_settb.c')
| -rw-r--r-- | libavfilter/f_settb.c | 194 |
1 files changed, 194 insertions, 0 deletions
diff --git a/libavfilter/f_settb.c b/libavfilter/f_settb.c new file mode 100644 index 0000000..f42a15c --- /dev/null +++ b/libavfilter/f_settb.c @@ -0,0 +1,194 @@ +/* + * Copyright (c) 2010 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 + * Set timebase for the output link. + */ + +#include <inttypes.h> +#include <stdio.h> + +#include "libavutil/avstring.h" +#include "libavutil/eval.h" +#include "libavutil/internal.h" +#include "libavutil/mathematics.h" +#include "libavutil/rational.h" +#include "avfilter.h" +#include "internal.h" +#include "audio.h" +#include "video.h" + +static const char *const var_names[] = { + "AVTB", /* default timebase 1/AV_TIME_BASE */ + "intb", /* input timebase */ + "sr", /* sample rate */ + NULL +}; + +enum var_name { + VAR_AVTB, + VAR_INTB, + VAR_SR, + VAR_VARS_NB +}; + +typedef struct { + char tb_expr[256]; + double var_values[VAR_VARS_NB]; +} SetTBContext; + +static av_cold int init(AVFilterContext *ctx, const char *args) +{ + SetTBContext *settb = ctx->priv; + av_strlcpy(settb->tb_expr, "intb", sizeof(settb->tb_expr)); + + if (args) + sscanf(args, "%255[^:]", settb->tb_expr); + + return 0; +} + +static int config_output_props(AVFilterLink *outlink) +{ + AVFilterContext *ctx = outlink->src; + SetTBContext *settb = ctx->priv; + AVFilterLink *inlink = ctx->inputs[0]; + AVRational time_base; + int ret; + double res; + + settb->var_values[VAR_AVTB] = av_q2d(AV_TIME_BASE_Q); + settb->var_values[VAR_INTB] = av_q2d(inlink->time_base); + settb->var_values[VAR_SR] = inlink->sample_rate; + + outlink->w = inlink->w; + outlink->h = inlink->h; + + if ((ret = av_expr_parse_and_eval(&res, settb->tb_expr, var_names, settb->var_values, + NULL, NULL, NULL, NULL, NULL, 0, NULL)) < 0) { + av_log(ctx, AV_LOG_ERROR, "Invalid expression '%s' for timebase.\n", settb->tb_expr); + return ret; + } + time_base = av_d2q(res, INT_MAX); + if (time_base.num <= 0 || time_base.den <= 0) { + av_log(ctx, AV_LOG_ERROR, + "Invalid non-positive values for the timebase num:%d or den:%d.\n", + time_base.num, time_base.den); + return AVERROR(EINVAL); + } + + outlink->time_base = time_base; + av_log(outlink->src, AV_LOG_VERBOSE, "tb:%d/%d -> tb:%d/%d\n", + inlink ->time_base.num, inlink ->time_base.den, + outlink->time_base.num, outlink->time_base.den); + + return 0; +} + +static int start_frame(AVFilterLink *inlink, AVFilterBufferRef *picref) +{ + AVFilterContext *ctx = inlink->dst; + AVFilterLink *outlink = ctx->outputs[0]; + + if (av_cmp_q(inlink->time_base, outlink->time_base)) { + int64_t orig_pts = picref->pts; + picref->pts = av_rescale_q(picref->pts, inlink->time_base, outlink->time_base); + av_log(ctx, AV_LOG_DEBUG, "tb:%d/%d pts:%"PRId64" -> tb:%d/%d pts:%"PRId64"\n", + inlink ->time_base.num, inlink ->time_base.den, orig_pts, + outlink->time_base.num, outlink->time_base.den, picref->pts); + } + inlink->cur_buf = NULL; + + return ff_start_frame(outlink, picref); +} + +static int filter_samples(AVFilterLink *inlink, AVFilterBufferRef *samplesref) +{ + AVFilterContext *ctx = inlink->dst; + AVFilterLink *outlink = ctx->outputs[0]; + + if (av_cmp_q(inlink->time_base, outlink->time_base)) { + int64_t orig_pts = samplesref->pts; + samplesref->pts = av_rescale_q(samplesref->pts, inlink->time_base, outlink->time_base); + av_log(ctx, AV_LOG_DEBUG, "tb:%d/%d pts:%"PRId64" -> tb:%d/%d pts:%"PRId64"\n", + inlink ->time_base.num, inlink ->time_base.den, orig_pts, + outlink->time_base.num, outlink->time_base.den, samplesref->pts); + } + + return ff_filter_samples(outlink, samplesref); +} + +#if CONFIG_SETTB_FILTER +static const AVFilterPad avfilter_vf_settb_inputs[] = { + { + .name = "default", + .type = AVMEDIA_TYPE_VIDEO, + .get_video_buffer = ff_null_get_video_buffer, + .start_frame = start_frame, + .end_frame = ff_null_end_frame + }, + { NULL } +}; + +static const AVFilterPad avfilter_vf_settb_outputs[] = { + { + .name = "default", + .type = AVMEDIA_TYPE_VIDEO, + .config_props = config_output_props, + }, + { NULL } +}; + +AVFilter avfilter_vf_settb = { + .name = "settb", + .description = NULL_IF_CONFIG_SMALL("Set timebase for the video output link."), + .init = init, + + .priv_size = sizeof(SetTBContext), + + .inputs = avfilter_vf_settb_inputs, + .outputs = avfilter_vf_settb_outputs, +}; +#endif + +#if CONFIG_ASETTB_FILTER +AVFilter avfilter_af_asettb = { + .name = "asettb", + .description = NULL_IF_CONFIG_SMALL("Set timebase for the audio output link."), + .init = init, + + .priv_size = sizeof(SetTBContext), + + .inputs = (const AVFilterPad[]) { + { .name = "default", + .type = AVMEDIA_TYPE_AUDIO, + .get_audio_buffer = ff_null_get_audio_buffer, + .filter_samples = filter_samples, }, + { .name = NULL } + }, + .outputs = (const AVFilterPad[]) { + { .name = "default", + .type = AVMEDIA_TYPE_AUDIO, + .config_props = config_output_props, }, + { .name = NULL} + }, +}; +#endif |
