From d12d48d0a8e188feecdfc9b792f54f0892ef6696 Mon Sep 17 00:00:00 2001 From: Paul B Mahol Date: Mon, 18 Jan 2016 11:22:32 +0100 Subject: avfilter: add streamselect and astreamselect filter MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Signed-off-by: Clément Bœsch Signed-off-by: Paul B Mahol --- libavfilter/f_streamselect.c | 353 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 353 insertions(+) create mode 100644 libavfilter/f_streamselect.c (limited to 'libavfilter/f_streamselect.c') diff --git a/libavfilter/f_streamselect.c b/libavfilter/f_streamselect.c new file mode 100644 index 0000000000..db46c997ed --- /dev/null +++ b/libavfilter/f_streamselect.c @@ -0,0 +1,353 @@ +/* + * 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 + */ + +#include "libavutil/avstring.h" +#include "libavutil/internal.h" +#include "libavutil/opt.h" +#include "avfilter.h" +#include "audio.h" +#include "formats.h" +#include "framesync.h" +#include "internal.h" +#include "video.h" + +typedef struct StreamSelectContext { + const AVClass *class; + int nb_inputs; + char *map_str; + int *map; + int nb_map; + int is_audio; + int64_t *last_pts; + AVFrame **frames; + FFFrameSync fs; +} StreamSelectContext; + +#define OFFSET(x) offsetof(StreamSelectContext, x) +#define FLAGS AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_FILTERING_PARAM +static const AVOption streamselect_options[] = { + { "inputs", "number of input streams", OFFSET(nb_inputs), AV_OPT_TYPE_INT, {.i64=2}, 2, INT_MAX, .flags=FLAGS }, + { "map", "input indexes to remap to outputs", OFFSET(map_str), AV_OPT_TYPE_STRING, {.str=NULL}, .flags=FLAGS }, + { NULL } +}; + +AVFILTER_DEFINE_CLASS(streamselect); + +static int filter_frame(AVFilterLink *inlink, AVFrame *in) +{ + StreamSelectContext *s = inlink->dst->priv; + return ff_framesync_filter_frame(&s->fs, inlink, in); +} + +static int process_frame(FFFrameSync *fs) +{ + AVFilterContext *ctx = fs->parent; + StreamSelectContext *s = fs->opaque; + AVFrame **in = s->frames; + int i, j, ret = 0; + + for (i = 0; i < ctx->nb_inputs; i++) { + if ((ret = ff_framesync_get_frame(&s->fs, i, &in[i], 0)) < 0) + return ret; + } + + for (j = 0; j < ctx->nb_inputs; j++) { + for (i = 0; i < s->nb_map; i++) { + if (s->map[i] == j) { + AVFrame *out; + + if (s->is_audio && s->last_pts[j] == in[j]->pts && + ctx->outputs[i]->frame_count > 0) + continue; + out = av_frame_clone(in[j]); + if (!out) + return AVERROR(ENOMEM); + + out->pts = av_rescale_q(s->fs.pts, s->fs.time_base, ctx->outputs[i]->time_base); + s->last_pts[j] = in[j]->pts; + ret = ff_filter_frame(ctx->outputs[i], out); + if (ret < 0) + return ret; + } + } + } + + return ret; +} + +static int request_frame(AVFilterLink *outlink) +{ + StreamSelectContext *s = outlink->src->priv; + return ff_framesync_request_frame(&s->fs, outlink); +} + +static int config_output(AVFilterLink *outlink) +{ + AVFilterContext *ctx = outlink->src; + StreamSelectContext *s = ctx->priv; + const int outlink_idx = FF_OUTLINK_IDX(outlink); + const int inlink_idx = s->map[outlink_idx]; + AVFilterLink *inlink = ctx->inputs[inlink_idx]; + FFFrameSyncIn *in; + int i, ret; + + av_log(ctx, AV_LOG_VERBOSE, "config output link %d " + "with settings from input link %d\n", + outlink_idx, inlink_idx); + + switch (outlink->type) { + case AVMEDIA_TYPE_VIDEO: + outlink->w = inlink->w; + outlink->h = inlink->h; + outlink->sample_aspect_ratio = inlink->sample_aspect_ratio; + outlink->frame_rate = inlink->frame_rate; + break; + case AVMEDIA_TYPE_AUDIO: + outlink->sample_rate = inlink->sample_rate; + outlink->channels = inlink->channels; + outlink->channel_layout = inlink->channel_layout; + break; + } + + outlink->time_base = inlink->time_base; + outlink->format = inlink->format; + + if (s->fs.opaque == s) + return 0; + + if ((ret = ff_framesync_init(&s->fs, ctx, ctx->nb_inputs)) < 0) + return ret; + + in = s->fs.in; + s->fs.opaque = s; + s->fs.on_event = process_frame; + + for (i = 0; i < ctx->nb_inputs; i++) { + in[i].time_base = ctx->inputs[i]->time_base; + in[i].sync = 1; + in[i].before = EXT_STOP; + in[i].after = EXT_STOP; + } + + s->frames = av_calloc(ctx->nb_inputs, sizeof(*s->frames)); + if (!s->frames) + return AVERROR(ENOMEM); + + return ff_framesync_configure(&s->fs); +} + +static int parse_definition(AVFilterContext *ctx, int nb_pads, void *filter_frame, int is_audio) +{ + const int is_input = !!filter_frame; + const char *padtype = is_input ? "in" : "out"; + int i = 0, ret = 0; + + for (i = 0; i < nb_pads; i++) { + AVFilterPad pad = { 0 }; + + pad.type = is_audio ? AVMEDIA_TYPE_AUDIO : AVMEDIA_TYPE_VIDEO; + + pad.name = av_asprintf("%sput%d", padtype, i); + if (!pad.name) + return AVERROR(ENOMEM); + + av_log(ctx, AV_LOG_DEBUG, "Add %s pad %s\n", padtype, pad.name); + + if (is_input) { + pad.filter_frame = filter_frame; + ret = ff_insert_inpad(ctx, i, &pad); + } else { + pad.config_props = config_output; + pad.request_frame = request_frame; + ret = ff_insert_outpad(ctx, i, &pad); + } + + if (ret < 0) { + av_freep(&pad.name); + return ret; + } + } + + return 0; +} + +static int parse_mapping(AVFilterContext *ctx, const char *map) +{ + StreamSelectContext *s = ctx->priv; + int *new_map; + int new_nb_map = 0; + + if (!map) { + av_log(ctx, AV_LOG_ERROR, "mapping definition is not set\n"); + return AVERROR(EINVAL); + } + + new_map = av_calloc(s->nb_inputs, sizeof(*new_map)); + if (!new_map) + return AVERROR(ENOMEM); + + while (1) { + char *p; + const int n = strtol(map, &p, 0); + + av_log(ctx, AV_LOG_DEBUG, "n=%d map=%p p=%p\n", n, map, p); + + if (map == p) + break; + map = p; + + if (new_nb_map >= s->nb_inputs) { + av_log(ctx, AV_LOG_ERROR, "Unable to map more than the %d " + "input pads available\n", s->nb_inputs); + av_free(new_map); + return AVERROR(EINVAL); + } + + if (n < 0 || n >= ctx->nb_inputs) { + av_log(ctx, AV_LOG_ERROR, "Input stream index %d doesn't exist " + "(there is only %d input streams defined)\n", + n, s->nb_inputs); + av_free(new_map); + return AVERROR(EINVAL); + } + + av_log(ctx, AV_LOG_VERBOSE, "Map input stream %d to output stream %d\n", n, new_nb_map); + new_map[new_nb_map++] = n; + } + + if (!new_nb_map) { + av_log(ctx, AV_LOG_ERROR, "invalid mapping\n"); + av_free(new_map); + return AVERROR(EINVAL); + } + + av_freep(&s->map); + s->map = new_map; + s->nb_map = new_nb_map; + + av_log(ctx, AV_LOG_VERBOSE, "%d map set\n", s->nb_map); + + return 0; +} + +static int process_command(AVFilterContext *ctx, const char *cmd, const char *args, + char *res, int res_len, int flags) +{ + if (!strcmp(cmd, "map")) { + int ret = parse_mapping(ctx, args); + + if (ret < 0) + return ret; + return avfilter_config_links(ctx); + } + return AVERROR(ENOSYS); +} + +static av_cold int init(AVFilterContext *ctx) +{ + StreamSelectContext *s = ctx->priv; + int ret, nb_outputs = 0; + char *map = s->map_str; + + if (!strcmp(ctx->filter->name, "astreamselect")) + s->is_audio = 1; + + for (;;) { + char *p; + + strtol(map, &p, 0); + if (map == p) + break; + nb_outputs++; + map = p; + } + + s->last_pts = av_calloc(s->nb_inputs, sizeof(*s->last_pts)); + if (!s->last_pts) + return AVERROR(ENOMEM); + + if ((ret = parse_definition(ctx, s->nb_inputs, filter_frame, s->is_audio)) < 0 || + (ret = parse_definition(ctx, nb_outputs, NULL, s->is_audio)) < 0) + return ret; + + av_log(ctx, AV_LOG_DEBUG, "Configured with %d inpad and %d outpad\n", + ctx->nb_inputs, ctx->nb_outputs); + + return parse_mapping(ctx, s->map_str); +} + +static av_cold void uninit(AVFilterContext *ctx) +{ + StreamSelectContext *s = ctx->priv; + + av_freep(&s->last_pts); + av_freep(&s->map); + av_freep(&s->frames); + ff_framesync_uninit(&s->fs); +} + +static int query_formats(AVFilterContext *ctx) +{ + AVFilterFormats *formats, *rates = NULL; + AVFilterChannelLayouts *layouts = NULL; + int ret, i; + + for (i = 0; i < ctx->nb_inputs; i++) { + formats = ff_all_formats(ctx->inputs[i]->type); + if ((ret = ff_set_common_formats(ctx, formats)) < 0) + return ret; + + if (ctx->inputs[i]->type == AVMEDIA_TYPE_AUDIO) { + rates = ff_all_samplerates(); + if ((ret = ff_set_common_samplerates(ctx, rates)) < 0) + return ret; + layouts = ff_all_channel_counts(); + if ((ret = ff_set_common_channel_layouts(ctx, layouts)) < 0) + return ret; + } + } + + return 0; +} + +AVFilter ff_vf_streamselect = { + .name = "streamselect", + .description = NULL_IF_CONFIG_SMALL("Select video streams"), + .init = init, + .query_formats = query_formats, + .process_command = process_command, + .uninit = uninit, + .priv_size = sizeof(StreamSelectContext), + .priv_class = &streamselect_class, + .flags = AVFILTER_FLAG_DYNAMIC_INPUTS | AVFILTER_FLAG_DYNAMIC_OUTPUTS, +}; + +#define astreamselect_options streamselect_options +AVFILTER_DEFINE_CLASS(astreamselect); + +AVFilter ff_af_astreamselect = { + .name = "astreamselect", + .description = NULL_IF_CONFIG_SMALL("Select audio streams"), + .init = init, + .query_formats = query_formats, + .process_command = process_command, + .uninit = uninit, + .priv_size = sizeof(StreamSelectContext), + .priv_class = &astreamselect_class, + .flags = AVFILTER_FLAG_DYNAMIC_INPUTS | AVFILTER_FLAG_DYNAMIC_OUTPUTS, +}; -- cgit v1.2.3