avcodec/codec_internal: Add macros for update_thread_context(_for_user)

It reduces typing: Before this patch, there were 11 callbacks
that exceeded the 80 char line length limit; now there are zero.
It also allows to remove ONLY_IF_THREADS_ENABLED() in
libavutil/internal.h.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

libavcodec/cfhd.c

@@ -1464,7 +1464,7 @@ const FFCodec ff_cfhd_decoder = {
     .init             = cfhd_init,
     .close            = cfhd_close,
     FF_CODEC_DECODE_CB(cfhd_decode),
-    .update_thread_context = ONLY_IF_THREADS_ENABLED(update_thread_context),
+    UPDATE_THREAD_CONTEXT(update_thread_context),
     .p.capabilities   = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS,
     .caps_internal    = FF_CODEC_CAP_INIT_CLEANUP,
 };

libavcodec/codec_internal.h

@@ -264,6 +264,18 @@ typedef struct FFCodec {
 #define CODEC_LONG_NAME(str) .p.long_name = str
 #endif
 
+#if HAVE_THREADS
+#define UPDATE_THREAD_CONTEXT(func) \
+        .update_thread_context          = (func)
+#define UPDATE_THREAD_CONTEXT_FOR_USER(func) \
+        .update_thread_context_for_user = (func)
+#else
+#define UPDATE_THREAD_CONTEXT(func) \
+        .update_thread_context          = NULL
+#define UPDATE_THREAD_CONTEXT_FOR_USER(func) \
+        .update_thread_context_for_user = NULL
+#endif
+
 #define FF_CODEC_DECODE_CB(func)                          \
     .cb_type           = FF_CODEC_CB_TYPE_DECODE,         \
     .cb.decode         = (func)

libavcodec/ffv1dec.c

@@ -1077,7 +1077,7 @@ const FFCodec ff_ffv1_decoder = {
     .init           = decode_init,
     .close          = ff_ffv1_close,
     FF_CODEC_DECODE_CB(decode_frame),
-    .update_thread_context = ONLY_IF_THREADS_ENABLED(update_thread_context),
+    UPDATE_THREAD_CONTEXT(update_thread_context),
     .p.capabilities = AV_CODEC_CAP_DR1 /*| AV_CODEC_CAP_DRAW_HORIZ_BAND*/ |
                       AV_CODEC_CAP_FRAME_THREADS | AV_CODEC_CAP_SLICE_THREADS,
     .caps_internal  = FF_CODEC_CAP_INIT_CLEANUP |

libavcodec/h264dec.c

@@ -1105,8 +1105,8 @@ const FFCodec ff_h264_decoder = {
     .caps_internal         = FF_CODEC_CAP_EXPORTS_CROPPING |
                              FF_CODEC_CAP_ALLOCATE_PROGRESS | FF_CODEC_CAP_INIT_CLEANUP,
     .flush                 = h264_decode_flush,
-    .update_thread_context = ONLY_IF_THREADS_ENABLED(ff_h264_update_thread_context),
-    .update_thread_context_for_user = ONLY_IF_THREADS_ENABLED(ff_h264_update_thread_context_for_user),
+    UPDATE_THREAD_CONTEXT(ff_h264_update_thread_context),
+    UPDATE_THREAD_CONTEXT_FOR_USER(ff_h264_update_thread_context_for_user),
     .p.profiles            = NULL_IF_CONFIG_SMALL(ff_h264_profiles),
     .p.priv_class          = &h264_class,
 };

libavcodec/hevcdec.c

@@ -3854,7 +3854,7 @@ const FFCodec ff_hevc_decoder = {
     .close                 = hevc_decode_free,
     FF_CODEC_DECODE_CB(hevc_decode_frame),
     .flush                 = hevc_decode_flush,
-    .update_thread_context = ONLY_IF_THREADS_ENABLED(hevc_update_thread_context),
+    UPDATE_THREAD_CONTEXT(hevc_update_thread_context),
     .p.capabilities        = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_DELAY |
                              AV_CODEC_CAP_SLICE_THREADS | AV_CODEC_CAP_FRAME_THREADS,
     .caps_internal         = FF_CODEC_CAP_EXPORTS_CROPPING |

libavcodec/mimic.c

@@ -446,7 +446,7 @@ const FFCodec ff_mimic_decoder = {
     .close                 = mimic_decode_end,
     FF_CODEC_DECODE_CB(mimic_decode_frame),
     .p.capabilities        = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS,
-    .update_thread_context = ONLY_IF_THREADS_ENABLED(mimic_decode_update_thread_context),
+    UPDATE_THREAD_CONTEXT(mimic_decode_update_thread_context),
     .caps_internal         = FF_CODEC_CAP_ALLOCATE_PROGRESS |
                              FF_CODEC_CAP_INIT_CLEANUP,
 };

libavcodec/mpeg12dec.c

@@ -2880,7 +2880,7 @@ const FFCodec ff_mpeg1video_decoder = {
     .caps_internal         = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
     .flush                 = flush,
     .p.max_lowres          = 3,
-    .update_thread_context = ONLY_IF_THREADS_ENABLED(mpeg_decode_update_thread_context),
+    UPDATE_THREAD_CONTEXT(mpeg_decode_update_thread_context),
     .hw_configs            = (const AVCodecHWConfigInternal *const []) {
 #if CONFIG_MPEG1_NVDEC_HWACCEL
                                HWACCEL_NVDEC(mpeg1),

libavcodec/mpeg4videodec.c

@@ -3686,8 +3686,8 @@ const FFCodec ff_mpeg4_decoder = {
     .p.max_lowres          = 3,
     .p.pix_fmts            = ff_h263_hwaccel_pixfmt_list_420,
     .p.profiles            = NULL_IF_CONFIG_SMALL(ff_mpeg4_video_profiles),
-    .update_thread_context = ONLY_IF_THREADS_ENABLED(mpeg4_update_thread_context),
-    .update_thread_context_for_user = ONLY_IF_THREADS_ENABLED(mpeg4_update_thread_context_for_user),
+    UPDATE_THREAD_CONTEXT(mpeg4_update_thread_context),
+    UPDATE_THREAD_CONTEXT_FOR_USER(mpeg4_update_thread_context_for_user),
     .p.priv_class = &mpeg4_class,
     .hw_configs            = (const AVCodecHWConfigInternal *const []) {
 #if CONFIG_MPEG4_NVDEC_HWACCEL

libavcodec/pngdec.c

@@ -1722,7 +1722,7 @@ const FFCodec ff_apng_decoder = {
     .init           = png_dec_init,
     .close          = png_dec_end,
     FF_CODEC_DECODE_CB(decode_frame_apng),
-    .update_thread_context = ONLY_IF_THREADS_ENABLED(update_thread_context),
+    UPDATE_THREAD_CONTEXT(update_thread_context),
     .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS /*| AV_CODEC_CAP_DRAW_HORIZ_BAND*/,
     .caps_internal  = FF_CODEC_CAP_INIT_CLEANUP |
                       FF_CODEC_CAP_ALLOCATE_PROGRESS |
@@ -1740,7 +1740,7 @@ const FFCodec ff_png_decoder = {
     .init           = png_dec_init,
     .close          = png_dec_end,
     FF_CODEC_DECODE_CB(decode_frame_png),
-    .update_thread_context = ONLY_IF_THREADS_ENABLED(update_thread_context),
+    UPDATE_THREAD_CONTEXT(update_thread_context),
     .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS /*| AV_CODEC_CAP_DRAW_HORIZ_BAND*/,
     .caps_internal  = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM |
                       FF_CODEC_CAP_ALLOCATE_PROGRESS | FF_CODEC_CAP_INIT_CLEANUP |

libavcodec/proresdec2.c

@@ -878,7 +878,7 @@ const FFCodec ff_prores_decoder = {
     .init           = decode_init,
     .close          = decode_close,
     FF_CODEC_DECODE_CB(decode_frame),
-    .update_thread_context = ONLY_IF_THREADS_ENABLED(update_thread_context),
+    UPDATE_THREAD_CONTEXT(update_thread_context),
     .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_SLICE_THREADS | AV_CODEC_CAP_FRAME_THREADS,
     .p.profiles     = NULL_IF_CONFIG_SMALL(ff_prores_profiles),
     .hw_configs     = (const AVCodecHWConfigInternal *const []) {