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Support filters and decoders that dont support negative linesizes.

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This patch is based on work by stefano.

Originally committed as revision 26108 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2010-12-27 15:10:21 +00:00
parent 9e99f84f7d
commit 0ccabeeaef
4 changed files with 15 additions and 6 deletions
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3
ffplay.c
View File

@ -1616,6 +1616,9 @@ static int input_get_buffer(AVCodecContext *codec, AVFrame *pic)
int i, w, h, stride[4];
unsigned edge;
if (codec->codec->capabilities & CODEC_CAP_NEG_LINESIZES)
perms |= AV_PERM_NEG_LINESIZES;
if(pic->buffer_hints & FF_BUFFER_HINTS_VALID) {
if(pic->buffer_hints & FF_BUFFER_HINTS_READABLE) perms |= AV_PERM_READ;
if(pic->buffer_hints & FF_BUFFER_HINTS_PRESERVE) perms |= AV_PERM_PRESERVE;

11
libavfilter/avfilter.c
View File

@ -197,12 +197,13 @@ int avfilter_config_links(AVFilterContext *filter)
char *ff_get_ref_perms_string(char *buf, size_t buf_size, int perms)
{
snprintf(buf, buf_size, "%s%s%s%s%s",
snprintf(buf, buf_size, "%s%s%s%s%s%s",
perms & AV_PERM_READ ? "r" : "",
perms & AV_PERM_WRITE ? "w" : "",
perms & AV_PERM_PRESERVE ? "p" : "",
perms & AV_PERM_REUSE ? "u" : "",
perms & AV_PERM_REUSE2 ? "U" : "");
perms & AV_PERM_REUSE2 ? "U" : "",
perms & AV_PERM_NEG_LINESIZES ? "n" : "");
return buf;
}
@ -360,15 +361,17 @@ void avfilter_start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
{
void (*start_frame)(AVFilterLink *, AVFilterBufferRef *);
AVFilterPad *dst = link->dstpad;
int perms = picref->perms;
FF_DPRINTF_START(NULL, start_frame); ff_dprintf_link(NULL, link, 0); dprintf(NULL, " "); ff_dprintf_ref(NULL, picref, 1);
if (!(start_frame = dst->start_frame))
start_frame = avfilter_default_start_frame;
if (picref->linesize[0] < 0)
perms |= AV_PERM_NEG_LINESIZES;
/* prepare to copy the picture if it has insufficient permissions */
if ((dst->min_perms & picref->perms) != dst->min_perms ||
dst->rej_perms & picref->perms) {
if ((dst->min_perms & perms) != dst->min_perms || dst->rej_perms & perms) {
av_log(link->dst, AV_LOG_DEBUG,
"frame copy needed (have perms %x, need %x, reject %x)\n",
picref->perms,

1
libavfilter/avfilter.h
View File

@ -87,6 +87,7 @@ typedef struct AVFilterBuffer {
#define AV_PERM_PRESERVE 0x04 ///< nobody else can overwrite the buffer
#define AV_PERM_REUSE 0x08 ///< can output the buffer multiple times, with the same contents each time
#define AV_PERM_REUSE2 0x10 ///< can output the buffer multiple times, modified each time
#define AV_PERM_NEG_LINESIZES 0x20 ///< the buffer requested can have negative linesizes
/**
* Audio specific properties in a reference to an AVFilterBuffer. Since

6
libavfilter/vf_vflip.c
View File

@ -43,11 +43,13 @@ static AVFilterBufferRef *get_video_buffer(AVFilterLink *link, int perms,
int w, int h)
{
FlipContext *flip = link->dst->priv;
AVFilterBufferRef *picref;
int i;
AVFilterBufferRef *picref = avfilter_get_video_buffer(link->dst->outputs[0],
perms, w, h);
if (!(perms & AV_PERM_NEG_LINESIZES))
return avfilter_default_get_video_buffer(link, perms, w, h);
picref = avfilter_get_video_buffer(link->dst->outputs[0], perms, w, h);
for (i = 0; i < 4; i ++) {
int vsub = i == 1 || i == 2 ? flip->vsub : 0;