lavc/libopenh264enc: Add coder option to replace cabac

Set DEPRECATED flag to option cabac, replace with coder. The
priority logic is:
1. s->coder; then
2. avctx->coder_type; then
3. s->cabac.

Change the default option to -1 and allow the default cabac to be
determined by profile.

Add FF_API_OPENH264_CABAC macro for cabac to remove this option after
LIBAVCODEC_VERSION_MAJOR = 59.

Reviewed-by: Martin Storsjö <martin@martin.st>
Signed-off-by: Linjie Fu <linjie.fu@intel.com>

libavcodec/libopenh264enc.c

@@ -48,7 +48,10 @@ typedef struct SVCContext {
     int max_nal_size;
     int skip_frames;
     int skipped;
-    int cabac;
+#if FF_API_OPENH264_CABAC
+    int cabac;                      // deprecated
+#endif
+    int coder;
 
     // rate control mode
     int rc_mode;
@@ -83,7 +86,15 @@ static const AVOption options[] = {
 #undef PROFILE
     { "max_nal_size", "set maximum NAL size in bytes", OFFSET(max_nal_size), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, VE },
     { "allow_skip_frames", "allow skipping frames to hit the target bitrate", OFFSET(skip_frames), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, VE },
-    { "cabac", "Enable cabac", OFFSET(cabac), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE },
+#if FF_API_OPENH264_CABAC
+    { "cabac", "Enable cabac(deprecated, use coder)", OFFSET(cabac), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE|DEPRECATED },
+#endif
+    { "coder", "Coder type",  OFFSET(coder), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, 1, VE, "coder" },
+        { "default",          NULL, 0, AV_OPT_TYPE_CONST, { .i64 = -1 }, INT_MIN, INT_MAX, VE, "coder" },
+        { "cavlc",            NULL, 0, AV_OPT_TYPE_CONST, { .i64 = 0 },  INT_MIN, INT_MAX, VE, "coder" },
+        { "cabac",            NULL, 0, AV_OPT_TYPE_CONST, { .i64 = 1 },  INT_MIN, INT_MAX, VE, "coder" },
+        { "vlc",              NULL, 0, AV_OPT_TYPE_CONST, { .i64 = 0 },  INT_MIN, INT_MAX, VE, "coder" },
+        { "ac",               NULL, 0, AV_OPT_TYPE_CONST, { .i64 = 1 },  INT_MIN, INT_MAX, VE, "coder" },
 
     { "rc_mode", "Select rate control mode", OFFSET(rc_mode), AV_OPT_TYPE_INT, { .i64 = RC_QUALITY_MODE }, RC_OFF_MODE, RC_TIMESTAMP_MODE, VE, "rc_mode" },
         { "off",       "bit rate control off",                                                 0, AV_OPT_TYPE_CONST, { .i64 = RC_OFF_MODE },         0, 0, VE, "rc_mode" },
@@ -145,13 +156,6 @@ static av_cold int svc_encode_init(AVCodecContext *avctx)
 
     (*s->encoder)->GetDefaultParams(s->encoder, &param);
 
-#if FF_API_CODER_TYPE
-FF_DISABLE_DEPRECATION_WARNINGS
-    if (!s->cabac)
-        s->cabac = avctx->coder_type == FF_CODER_TYPE_AC;
-FF_ENABLE_DEPRECATION_WARNINGS
-#endif
-
     param.fMaxFrameRate              = 1/av_q2d(avctx->time_base);
     param.iPicWidth                  = avctx->width;
     param.iPicHeight                 = avctx->height;
@@ -197,12 +201,22 @@ FF_ENABLE_DEPRECATION_WARNINGS
             break;
         }
 
-    if (s->profile == FF_PROFILE_UNKNOWN)
-        s->profile = !s->cabac ? FF_PROFILE_H264_CONSTRAINED_BASELINE :
+#if FF_API_CODER_TYPE && FF_API_OPENH264_CABAC
+FF_DISABLE_DEPRECATION_WARNINGS
+    if (s->coder < 0 && avctx->coder_type == FF_CODER_TYPE_AC)
+        s->coder = 1;
+
+    if (s->coder < 0)
+        s->coder = s->cabac;
+FF_ENABLE_DEPRECATION_WARNINGS
+#endif
+
+    if (s->profile == FF_PROFILE_UNKNOWN && s->coder >= 0)
+        s->profile = s->coder == 0 ? FF_PROFILE_H264_CONSTRAINED_BASELINE :
 #if OPENH264_VER_AT_LEAST(1, 8)
-                                 FF_PROFILE_H264_HIGH;
+                                     FF_PROFILE_H264_HIGH;
 #else
-                                 FF_PROFILE_H264_MAIN;
+                                     FF_PROFILE_H264_MAIN;
 #endif
 
     switch (s->profile) {

libavcodec/version.h

@@ -138,6 +138,9 @@
 #ifndef FF_API_OPENH264_SLICE_MODE
 #define FF_API_OPENH264_SLICE_MODE (LIBAVCODEC_VERSION_MAJOR < 59)
 #endif
+#ifndef FF_API_OPENH264_CABAC
+#define FF_API_OPENH264_CABAC      (LIBAVCODEC_VERSION_MAJOR < 59)
+#endif
 
 
 #endif /* AVCODEC_VERSION_H */