libavfilter: Support the forks ABI for buffer sinks

With this change avconv compiled against libav and linked to ffmpegs libs
will run through the whole fate testsuite without any crashes.
857 tests pass, the remaining tests fail one way or another, which is
to be expected as avconv is not a drop in replacement for ffmpeg
The testsuite used was the ffmpeg fate testsuite, not libavs.
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavfilter/allfilters.c

@@ -64,8 +64,11 @@ void avfilter_register_all(void)
     REGISTER_FILTER (ANULLSRC,    anullsrc,    asrc);
     REGISTER_FILTER (FLITE,       flite,       asrc);
 
+#if !AV_HAVE_INCOMPATIBLE_FORK_ABI
     REGISTER_FILTER (ABUFFERSINK, abuffersink, asink);
+#endif
     REGISTER_FILTER (ANULLSINK,   anullsink,   asink);
+    REGISTER_FILTER (FFABUFFERSINK, ffabuffersink, asink);
 
     REGISTER_FILTER (ALPHAEXTRACT, alphaextract, vf);
     REGISTER_FILTER (ALPHAMERGE,  alphamerge,  vf);
@@ -140,7 +143,10 @@ void avfilter_register_all(void)
     REGISTER_FILTER (SMPTEBARS,   smptebars,   vsrc);
     REGISTER_FILTER (TESTSRC,     testsrc,     vsrc);
 
+#if !AV_HAVE_INCOMPATIBLE_FORK_ABI
     REGISTER_FILTER (BUFFERSINK,  buffersink,  vsink);
+#endif
+    REGISTER_FILTER (FFBUFFERSINK,ffbuffersink,vsink);
     REGISTER_FILTER (NULLSINK,    nullsink,    vsink);
 
     /* multimedia filters */

libavfilter/buffersink.c

@@ -141,7 +141,11 @@ int av_buffersink_read_samples(AVFilterContext *ctx, AVFilterBufferRef **pbuf,
 }
 
 AVFilter avfilter_vsink_buffer = {
+#if AV_HAVE_INCOMPATIBLE_FORK_ABI
+    .name      = "buffersink",
+#else
     .name      = "buffersink_old",
+#endif
     .description = NULL_IF_CONFIG_SMALL("Buffer video frames, and make them available to the end of the filter graph."),
     .priv_size = sizeof(BufferSinkContext),
     .uninit    = uninit,
@@ -156,7 +160,11 @@ AVFilter avfilter_vsink_buffer = {
 };
 
 AVFilter avfilter_asink_abuffer = {
+#if AV_HAVE_INCOMPATIBLE_FORK_ABI
+    .name      = "abuffersink",
+#else
     .name      = "abuffersink_old",
+#endif
     .description = NULL_IF_CONFIG_SMALL("Buffer audio frames, and make them available to the end of the filter graph."),
     .priv_size = sizeof(BufferSinkContext),
     .uninit    = uninit,

libavfilter/sink_buffer.c

@@ -143,7 +143,10 @@ int av_buffersink_get_buffer_ref(AVFilterContext *ctx,
     int ret;
     *bufref = NULL;
 
-    av_assert0(!strcmp(ctx->filter->name, "buffersink") || !strcmp(ctx->filter->name, "abuffersink"));
+    av_assert0(    !strcmp(ctx->filter->name, "buffersink")
+                || !strcmp(ctx->filter->name, "abuffersink")
+                || !strcmp(ctx->filter->name, "ffbuffersink")
+                || !strcmp(ctx->filter->name, "ffabuffersink"));
 
     /* no picref available, fetch it from the filterchain */
     if (!av_fifo_size(buf->fifo)) {
@@ -166,7 +169,8 @@ int av_buffersink_get_buffer_ref(AVFilterContext *ctx,
 
 AVRational av_buffersink_get_frame_rate(AVFilterContext *ctx)
 {
-    av_assert0(!strcmp(ctx->filter->name, "buffersink"));
+    av_assert0(   !strcmp(ctx->filter->name, "buffersink")
+               || !strcmp(ctx->filter->name, "ffbuffersink"));
 
     return ctx->inputs[0]->frame_rate;
 }
@@ -176,7 +180,10 @@ int av_buffersink_poll_frame(AVFilterContext *ctx)
     BufferSinkContext *buf = ctx->priv;
     AVFilterLink *inlink = ctx->inputs[0];
 
-    av_assert0(!strcmp(ctx->filter->name, "buffersink") || !strcmp(ctx->filter->name, "abuffersink"));
+    av_assert0(   !strcmp(ctx->filter->name, "buffersink")
+               || !strcmp(ctx->filter->name, "abuffersink")
+               || !strcmp(ctx->filter->name, "ffbuffersink")
+               || !strcmp(ctx->filter->name, "ffabuffersink"));
 
     return av_fifo_size(buf->fifo)/sizeof(AVFilterBufferRef *) + ff_poll_frame(inlink);
 }
@@ -218,6 +225,23 @@ static int vsink_query_formats(AVFilterContext *ctx)
     return 0;
 }
 
+AVFilter avfilter_vsink_ffbuffersink = {
+    .name      = "ffbuffersink",
+    .description = NULL_IF_CONFIG_SMALL("Buffer video frames, and make them available to the end of the filter graph."),
+    .priv_size = sizeof(BufferSinkContext),
+    .init_opaque = vsink_init,
+    .uninit    = vsink_uninit,
+
+    .query_formats = vsink_query_formats,
+
+    .inputs    = (const AVFilterPad[]) {{ .name    = "default",
+                                    .type          = AVMEDIA_TYPE_VIDEO,
+                                    .end_frame     = end_frame,
+                                    .min_perms     = AV_PERM_READ | AV_PERM_PRESERVE, },
+                                  { .name = NULL }},
+    .outputs   = (const AVFilterPad[]) {{ .name = NULL }},
+};
+
 AVFilter avfilter_vsink_buffersink = {
     .name      = "buffersink",
     .description = NULL_IF_CONFIG_SMALL("Buffer video frames, and make them available to the end of the filter graph."),
@@ -299,6 +323,22 @@ static int asink_query_formats(AVFilterContext *ctx)
     return 0;
 }
 
+AVFilter avfilter_asink_ffabuffersink = {
+    .name      = "ffabuffersink",
+    .description = NULL_IF_CONFIG_SMALL("Buffer audio frames, and make them available to the end of the filter graph."),
+    .init_opaque = asink_init,
+    .uninit    = asink_uninit,
+    .priv_size = sizeof(BufferSinkContext),
+    .query_formats = asink_query_formats,
+
+    .inputs    = (const AVFilterPad[]) {{ .name     = "default",
+                                    .type           = AVMEDIA_TYPE_AUDIO,
+                                    .filter_samples = filter_samples,
+                                    .min_perms      = AV_PERM_READ | AV_PERM_PRESERVE, },
+                                  { .name = NULL }},
+    .outputs   = (const AVFilterPad[]) {{ .name = NULL }},
+};
+
 AVFilter avfilter_asink_abuffersink = {
     .name      = "abuffersink",
     .description = NULL_IF_CONFIG_SMALL("Buffer audio frames, and make them available to the end of the filter graph."),