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ext/ffmpeg/: Latest ffmpeg revision's avcodec_close frees more; use safer coding to prevent double free and other rel...

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Original commit message from CVS:
* ext/ffmpeg/gstffmpegcfg.c: (gst_ffmpeg_cfg_fill_context):
* ext/ffmpeg/gstffmpegenc.c: (gst_ffmpegenc_getcaps):
Latest ffmpeg revision's avcodec_close frees more; use safer coding to
prevent double free and other related segfaults.
This commit is contained in:
Mark Nauwelaerts 2008-08-01 18:37:02 +00:00
parent f86e548d47
commit aadbfcfeb9
4 changed files with 40 additions and 22 deletions
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7
ChangeLog
View file

@ -1,3 +1,10 @@
2008-08-01 Mark Nauwelaerts <mark.nauwelaerts@collabora.co.uk>
* ext/ffmpeg/gstffmpegcfg.c: (gst_ffmpeg_cfg_fill_context):
* ext/ffmpeg/gstffmpegenc.c: (gst_ffmpegenc_getcaps):
Latest ffmpeg revision's avcodec_close frees more; use safer coding to
prevent double free and other related segfaults.
2008-07-28 Mark Nauwelaerts <mark.nauwelaerts@collabora.co.uk>
* ext/ffmpeg/gstffmpegcodecmap.c: (gst_ffmpeg_caps_to_pixfmt):

2
common

@ -1 +1 @@
Subproject commit e79879859bc866545379eb77e1378a906dc30ebf
Subproject commit d70ca17ae6fbe6020996e4567275d5e14972ed45

14
ext/ffmpeg/gstffmpegcfg.c
View file

@ -1013,9 +1013,17 @@ gst_ffmpeg_cfg_fill_context (GstFFMpegEnc * ffmpegenc, AVCodecContext * context)
context_offset = qdata->offset - CONTEXT_CONFIG_OFFSET;
if (gst_ffmpeg_cfg_codec_has_pspec (klass->in_plugin->id, pspec)
&& context_offset >= 0) {
/* memcpy a bit heavy for a small copy, but hardly part of 'inner loop' */
memcpy (G_STRUCT_MEMBER_P (context, context_offset),
G_STRUCT_MEMBER_P (ffmpegenc, qdata->offset), qdata->size);
if (G_PARAM_SPEC_VALUE_TYPE (pspec) == G_TYPE_STRING) {
/* make a copy for ffmpeg, it will likely free only some,
* but in any case safer than a potential double free */
G_STRUCT_MEMBER (gchar *, context, context_offset) =
g_strdup (G_STRUCT_MEMBER (gchar *, ffmpegenc, qdata->offset));
} else {
/* memcpy a bit heavy for a small copy,
* but hardly part of 'inner loop' */
memcpy (G_STRUCT_MEMBER_P (context, context_offset),
G_STRUCT_MEMBER_P (ffmpegenc, qdata->offset), qdata->size);
}
}
list = list->next;
}

39
ext/ffmpeg/gstffmpegenc.c
View file

@ -283,7 +283,7 @@ gst_ffmpegenc_getcaps (GstPad * pad)
GstFFMpegEnc *ffmpegenc = (GstFFMpegEnc *) GST_PAD_PARENT (pad);
GstFFMpegEncClass *oclass =
(GstFFMpegEncClass *) G_OBJECT_GET_CLASS (ffmpegenc);
AVCodecContext *ctx;
AVCodecContext *ctx = NULL;
enum PixelFormat pixfmt;
GstCaps *caps = NULL;
@ -306,21 +306,6 @@ gst_ffmpegenc_getcaps (GstPad * pad)
}
/* create cache etc. */
ctx = avcodec_alloc_context ();
if (!ctx) {
caps = gst_caps_copy (gst_pad_get_pad_template_caps (pad));
GST_DEBUG_OBJECT (ffmpegenc, "no context, return template caps %"GST_PTR_FORMAT, caps);
return caps;
}
/* set some default properties */
ctx->width = DEFAULT_WIDTH;
ctx->height = DEFAULT_HEIGHT;
ctx->time_base.num = DEFAULT_FRAME_RATE_BASE;
ctx->time_base.den = 25 * DEFAULT_FRAME_RATE_BASE;
ctx->bit_rate = DEFAULT_VIDEO_BITRATE;
/* makes it silent */
ctx->strict_std_compliance = -1;
/* shut up the logging while we autoprobe; we don't want warnings and
* errors about unsupported formats */
@ -335,6 +320,23 @@ gst_ffmpegenc_getcaps (GstPad * pad)
for (pixfmt = 0; pixfmt < PIX_FMT_NB; pixfmt++) {
GstCaps *tmpcaps;
/* need to start with a fresh codec_context each time around, since
* codec_close may have released stuff causing the next pass to segfault */
ctx = avcodec_alloc_context ();
if (!ctx) {
GST_DEBUG_OBJECT (ffmpegenc, "no context");
break;
}
/* set some default properties */
ctx->width = DEFAULT_WIDTH;
ctx->height = DEFAULT_HEIGHT;
ctx->time_base.num = DEFAULT_FRAME_RATE_BASE;
ctx->time_base.den = 25 * DEFAULT_FRAME_RATE_BASE;
ctx->bit_rate = DEFAULT_VIDEO_BITRATE;
/* makes it silent */
ctx->strict_std_compliance = -1;
ctx->pix_fmt = pixfmt;
if (gst_ffmpeg_avcodec_open (ctx, oclass->in_plugin) >= 0 &&
ctx->pix_fmt == pixfmt) {
@ -353,8 +355,8 @@ gst_ffmpegenc_getcaps (GstPad * pad)
}
if (ctx->priv_data)
gst_ffmpeg_avcodec_close (ctx);
av_free (ctx);
}
av_free (ctx);
#ifndef GST_DISABLE_GST_DEBUG
_shut_up_I_am_probing = FALSE;
#endif
@ -362,7 +364,8 @@ gst_ffmpegenc_getcaps (GstPad * pad)
/* make sure we have something */
if (!caps) {
caps = gst_caps_copy (gst_pad_get_pad_template_caps (pad));
GST_DEBUG_OBJECT (ffmpegenc, "probing gave nothing, return template %"GST_PTR_FORMAT, caps);
GST_DEBUG_OBJECT (ffmpegenc, "probing gave nothing, "
"return template %" GST_PTR_FORMAT, caps);
return caps;
}