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![Ganesh Ajjanagadde](/assets/img/avatar_default.png)
Many of the functions from avfilter/formats can return errors, usually AVERROR(ENOMEM). This propagates the return values. All of these were found by using av_warn_unused_result, demonstrating its utility. Tested with FATE. I am least sure of the changes to avfilter/filtergraph, since I don't know what/how reduce_format is intended to behave and how it should react to errors. Fixes: CID 1325680, 1325679, 1325678. Reviewed-by: Michael Niedermayer <michael@niedermayer.cc> Previous version Reviewed-by: Nicolas George <george@nsup.org> Previous version Reviewed-by: Clément Bœsch <u@pkh.me> Signed-off-by: Ganesh Ajjanagadde <gajjanagadde@gmail.com>
197 lines
6.7 KiB
C
197 lines
6.7 KiB
C
/*
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* Copyright (c) 2011 Mark Himsley
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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
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* video field order filter, heavily influenced by vf_pad.c
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*/
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#include "libavutil/imgutils.h"
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#include "libavutil/internal.h"
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#include "libavutil/opt.h"
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#include "libavutil/pixdesc.h"
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#include "avfilter.h"
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#include "formats.h"
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#include "internal.h"
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#include "video.h"
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typedef struct FieldOrderContext {
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const AVClass *class;
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int dst_tff; ///< output bff/tff
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int line_size[4]; ///< bytes of pixel data per line for each plane
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} FieldOrderContext;
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static int query_formats(AVFilterContext *ctx)
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{
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AVFilterFormats *formats;
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enum AVPixelFormat pix_fmt;
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int ret;
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/** accept any input pixel format that is not hardware accelerated, not
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* a bitstream format, and does not have vertically sub-sampled chroma */
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if (ctx->inputs[0]) {
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const AVPixFmtDescriptor *desc = NULL;
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formats = NULL;
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while ((desc = av_pix_fmt_desc_next(desc))) {
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pix_fmt = av_pix_fmt_desc_get_id(desc);
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if (!(desc->flags & AV_PIX_FMT_FLAG_HWACCEL ||
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desc->flags & AV_PIX_FMT_FLAG_PAL ||
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desc->flags & AV_PIX_FMT_FLAG_BITSTREAM) &&
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desc->nb_components && !desc->log2_chroma_h &&
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(ret = ff_add_format(&formats, pix_fmt)) < 0)
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return ret;
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}
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if ((ret = ff_formats_ref(formats, &ctx->inputs[0]->out_formats)) < 0 ||
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(ret = ff_formats_ref(formats, &ctx->outputs[0]->in_formats)) < 0)
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return ret;
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}
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return 0;
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}
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static int config_input(AVFilterLink *inlink)
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{
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AVFilterContext *ctx = inlink->dst;
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FieldOrderContext *s = ctx->priv;
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return av_image_fill_linesizes(s->line_size, inlink->format, inlink->w);
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}
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static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
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{
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AVFilterContext *ctx = inlink->dst;
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FieldOrderContext *s = ctx->priv;
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AVFilterLink *outlink = ctx->outputs[0];
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int h, plane, src_line_step, dst_line_step, line_size, line;
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uint8_t *dst, *src;
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AVFrame *out;
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if (!frame->interlaced_frame ||
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frame->top_field_first == s->dst_tff) {
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av_log(ctx, AV_LOG_VERBOSE,
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"Skipping %s.\n",
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frame->interlaced_frame ?
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"frame with same field order" : "progressive frame");
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return ff_filter_frame(outlink, frame);
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}
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if (av_frame_is_writable(frame)) {
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out = frame;
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} else {
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out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
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if (!out) {
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av_frame_free(&frame);
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return AVERROR(ENOMEM);
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}
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av_frame_copy_props(out, frame);
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}
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av_log(ctx, AV_LOG_TRACE,
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"picture will move %s one line\n",
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s->dst_tff ? "up" : "down");
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h = frame->height;
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for (plane = 0; plane < 4 && frame->data[plane] && frame->linesize[plane]; plane++) {
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dst_line_step = out->linesize[plane];
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src_line_step = frame->linesize[plane];
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line_size = s->line_size[plane];
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dst = out->data[plane];
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src = frame->data[plane];
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if (s->dst_tff) {
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/** Move every line up one line, working from
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* the top to the bottom of the frame.
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* The original top line is lost.
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* The new last line is created as a copy of the
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* penultimate line from that field. */
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for (line = 0; line < h; line++) {
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if (1 + line < frame->height) {
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memcpy(dst, src + src_line_step, line_size);
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} else {
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memcpy(dst, src - 2 * src_line_step, line_size);
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}
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dst += dst_line_step;
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src += src_line_step;
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}
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} else {
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/** Move every line down one line, working from
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* the bottom to the top of the frame.
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* The original bottom line is lost.
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* The new first line is created as a copy of the
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* second line from that field. */
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dst += (h - 1) * dst_line_step;
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src += (h - 1) * src_line_step;
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for (line = h - 1; line >= 0 ; line--) {
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if (line > 0) {
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memcpy(dst, src - src_line_step, line_size);
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} else {
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memcpy(dst, src + 2 * src_line_step, line_size);
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}
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dst -= dst_line_step;
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src -= src_line_step;
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}
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}
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}
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out->top_field_first = s->dst_tff;
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if (frame != out)
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av_frame_free(&frame);
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return ff_filter_frame(outlink, out);
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}
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#define OFFSET(x) offsetof(FieldOrderContext, x)
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#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
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static const AVOption fieldorder_options[] = {
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{ "order", "output field order", OFFSET(dst_tff), AV_OPT_TYPE_INT, { .i64 = 1 }, 0, 1, FLAGS, "order" },
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{ "bff", "bottom field first", 0, AV_OPT_TYPE_CONST, { .i64 = 0 }, .flags=FLAGS, .unit = "order" },
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{ "tff", "top field first", 0, AV_OPT_TYPE_CONST, { .i64 = 1 }, .flags=FLAGS, .unit = "order" },
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{ NULL }
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};
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AVFILTER_DEFINE_CLASS(fieldorder);
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static const AVFilterPad avfilter_vf_fieldorder_inputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.config_props = config_input,
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.filter_frame = filter_frame,
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},
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{ NULL }
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};
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static const AVFilterPad avfilter_vf_fieldorder_outputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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},
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{ NULL }
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};
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AVFilter ff_vf_fieldorder = {
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.name = "fieldorder",
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.description = NULL_IF_CONFIG_SMALL("Set the field order."),
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.priv_size = sizeof(FieldOrderContext),
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.priv_class = &fieldorder_class,
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.query_formats = query_formats,
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.inputs = avfilter_vf_fieldorder_inputs,
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.outputs = avfilter_vf_fieldorder_outputs,
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.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
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};
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