/* * Copyright (c) 2007 Bobby Bingham * * This file is part of Libav. * * Libav 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. * * Libav 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 Libav; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ /** * @file * format and noformat video filters */ #include "libavutil/pixdesc.h"#include "avfilter.h"#include "formats.h"#include "internal.h"#include "video.h" typedef struct {    /**     * List of flags telling if a given image format has been listed     * as argument to the filter.     */    int listed_pix_fmt_flags[PIX_FMT_NB];} FormatContext; #define PIX_FMT_NAME_MAXSIZE 32 static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque){    FormatContext *format = ctx->priv;    const char *cur, *sep;    char             pix_fmt_name[PIX_FMT_NAME_MAXSIZE];    int              pix_fmt_name_len;    enum PixelFormat pix_fmt;     /* parse the list of formats */    for (cur = args; cur; cur = sep ? sep+1 : NULL) {        if (!(sep = strchr(cur, ':')))            pix_fmt_name_len = strlen(cur);        else            pix_fmt_name_len = sep - cur;        if (pix_fmt_name_len >= PIX_FMT_NAME_MAXSIZE) {            av_log(ctx, AV_LOG_ERROR, "Format name too long\n");            return -1;        }         memcpy(pix_fmt_name, cur, pix_fmt_name_len);        pix_fmt_name[pix_fmt_name_len] = 0;        pix_fmt = av_get_pix_fmt(pix_fmt_name);         if (pix_fmt == PIX_FMT_NONE) {            av_log(ctx, AV_LOG_ERROR, "Unknown pixel format: %s\n", pix_fmt_name);            return -1;        }         format->listed_pix_fmt_flags[pix_fmt] = 1;    }     return 0;} static AVFilterFormats *make_format_list(FormatContext *format, int flag){    AVFilterFormats *formats;    enum PixelFormat pix_fmt;     formats = av_mallocz(sizeof(AVFilterFormats));    formats->formats = av_malloc(sizeof(enum PixelFormat) * PIX_FMT_NB);     for (pix_fmt = 0; pix_fmt < PIX_FMT_NB; pix_fmt++)        if (format->listed_pix_fmt_flags[pix_fmt] == flag)            formats->formats[formats->format_count++] = pix_fmt;     return formats;} #if CONFIG_FORMAT_FILTERstatic int query_formats_format(AVFilterContext *ctx){    ff_set_common_formats(ctx, make_format_list(ctx->priv, 1));    return 0;} AVFilter avfilter_vf_format = {    .name      = "format",    .description = NULL_IF_CONFIG_SMALL("Convert the input video to one of the specified pixel formats."),     .init      = init,     .query_formats = query_formats_format,     .priv_size = sizeof(FormatContext),     .inputs    = (AVFilterPad[]) {{ .name            = "default",                                    .type            = AVMEDIA_TYPE_VIDEO,                                    .get_video_buffer= ff_null_get_video_buffer,                                    .start_frame     = ff_null_start_frame,                                    .draw_slice      = ff_null_draw_slice,                                    .end_frame       = ff_null_end_frame, },                                  { .name = NULL}},    .outputs   = (AVFilterPad[]) {{ .name            = "default",                                    .type            = AVMEDIA_TYPE_VIDEO },                                  { .name = NULL}},};#endif /* CONFIG_FORMAT_FILTER */ #if CONFIG_NOFORMAT_FILTERstatic int query_formats_noformat(AVFilterContext *ctx){    ff_set_common_formats(ctx, make_format_list(ctx->priv, 0));    return 0;} AVFilter avfilter_vf_noformat = {    .name      = "noformat",    .description = NULL_IF_CONFIG_SMALL("Force libavfilter not to use any of the specified pixel formats for the input to the next filter."),     .init      = init,     .query_formats = query_formats_noformat,     .priv_size = sizeof(FormatContext),     .inputs    = (AVFilterPad[]) {{ .name            = "default",                                    .type            = AVMEDIA_TYPE_VIDEO,                                    .get_video_buffer= ff_null_get_video_buffer,                                    .start_frame     = ff_null_start_frame,                                    .draw_slice      = ff_null_draw_slice,                                    .end_frame       = ff_null_end_frame, },                                  { .name = NULL}},    .outputs   = (AVFilterPad[]) {{ .name            = "default",                                    .type            = AVMEDIA_TYPE_VIDEO },                                  { .name = NULL}},};#endif /* CONFIG_NOFORMAT_FILTER */