mirror of https://github.com/FFmpeg/FFmpeg.git
Originally committed as revision 20390 to svn://svn.ffmpeg.org/ffmpeg/trunkrelease/0.6
Stefano Sabatini
16 years ago
parent
51135d1d8e
commit
fcbed3c735
5 changed files with 193 additions and 1 deletions
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/*
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* copyright (c) 2007 Bobby Bingham |
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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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/**
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* @file libavfilter/vf_format.c |
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* video format and noformat filters |
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*/ |
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#include "avfilter.h" |
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typedef struct { |
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/**
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* List of flags telling if a given image format has been listed |
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* as argument to the filter. |
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*/ |
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int listed_pix_fmt_flags[PIX_FMT_NB]; |
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} FormatContext; |
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#define PIX_FMT_NAME_MAXSIZE 32 |
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static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque) |
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{ |
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FormatContext *format = ctx->priv; |
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const char *cur, *sep; |
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char pix_fmt_name[PIX_FMT_NAME_MAXSIZE]; |
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int pix_fmt_name_len; |
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enum PixelFormat pix_fmt; |
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/* parse the list of formats */ |
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for (cur = args; cur; cur = sep ? sep+1 : NULL) { |
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if (!(sep = strchr(cur, ':'))) |
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pix_fmt_name_len = strlen(cur); |
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else |
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pix_fmt_name_len = sep - cur; |
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if (pix_fmt_name_len >= PIX_FMT_NAME_MAXSIZE) { |
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av_log(ctx, AV_LOG_ERROR, "Format name too long\n"); |
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return -1; |
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} |
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memcpy(pix_fmt_name, cur, pix_fmt_name_len); |
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pix_fmt_name[pix_fmt_name_len] = 0; |
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pix_fmt = avcodec_get_pix_fmt(pix_fmt_name); |
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if (pix_fmt == PIX_FMT_NONE) { |
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av_log(ctx, AV_LOG_ERROR, "Unknown pixel format: %s\n", pix_fmt_name); |
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return -1; |
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} |
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format->listed_pix_fmt_flags[pix_fmt] = 1; |
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} |
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return 0; |
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} |
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static AVFilterFormats *make_format_list(FormatContext *format, int flag) |
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{ |
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AVFilterFormats *formats; |
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enum PixelFormat pix_fmt; |
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formats = av_mallocz(sizeof(AVFilterFormats)); |
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formats->formats = av_malloc(sizeof(enum PixelFormat) * PIX_FMT_NB); |
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for (pix_fmt = 0; pix_fmt < PIX_FMT_NB; pix_fmt++) |
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if (format->listed_pix_fmt_flags[pix_fmt] == flag) |
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formats->formats[formats->format_count++] = pix_fmt; |
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return formats; |
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} |
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static int query_formats_format(AVFilterContext *ctx) |
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{ |
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avfilter_set_common_formats(ctx, make_format_list(ctx->priv, 1)); |
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return 0; |
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} |
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static int query_formats_noformat(AVFilterContext *ctx) |
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{ |
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avfilter_set_common_formats(ctx, make_format_list(ctx->priv, 0)); |
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return 0; |
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} |
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static void start_frame(AVFilterLink *link, AVFilterPicRef *picref) |
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{ |
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avfilter_start_frame(link->dst->outputs[0], picref); |
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} |
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static void end_frame(AVFilterLink *link) |
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{ |
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avfilter_end_frame(link->dst->outputs[0]); |
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} |
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static void draw_slice(AVFilterLink *link, int y, int h) |
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{ |
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avfilter_draw_slice(link->dst->outputs[0], y, h); |
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} |
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AVFilter avfilter_vf_format = { |
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.name = "format", |
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.description = "Convert the input video to one of the specified pixel formats.", |
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.init = init, |
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.query_formats = query_formats_format, |
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.priv_size = sizeof(FormatContext), |
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.inputs = (AVFilterPad[]) {{ .name = "default", |
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.type = CODEC_TYPE_VIDEO, |
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.start_frame = start_frame, |
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.draw_slice = draw_slice, |
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.end_frame = end_frame, }, |
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{ .name = NULL}}, |
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.outputs = (AVFilterPad[]) {{ .name = "default", |
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.type = CODEC_TYPE_VIDEO }, |
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{ .name = NULL}}, |
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}; |
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AVFilter avfilter_vf_noformat = { |
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.name = "noformat", |
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.description = "Force libavfilter not to use any of the specified pixel formats as the input to the next filter.", |
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.init = init, |
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.query_formats = query_formats_noformat, |
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.priv_size = sizeof(FormatContext), |
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.inputs = (AVFilterPad[]) {{ .name = "default", |
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.type = CODEC_TYPE_VIDEO, |
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.start_frame = start_frame, |
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.draw_slice = draw_slice, |
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.end_frame = end_frame, }, |
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{ .name = NULL}}, |
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.outputs = (AVFilterPad[]) {{ .name = "default", |
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.type = CODEC_TYPE_VIDEO }, |
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{ .name = NULL}}, |
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}; |
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