vpxenc: add private options

Make libvpx support close to the libx264 one. Thanks to
Jan Gerber <j@v2v.cc> for the support.
Signed-off-by: Anton Khirnov <anton@khirnov.net>

libavcodec/libvpxenc.c

@@ -29,8 +29,10 @@
 #include <vpx/vp8cx.h>
 
 #include "avcodec.h"
+#include "internal.h"
 #include "libavutil/base64.h"
 #include "libavutil/mathematics.h"
+#include "libavutil/opt.h"
 
 /**
  * Portion of struct vpx_codec_cx_pkt from vpx_encoder.h.
@@ -48,11 +50,19 @@ struct FrameListData {
 };
 
 typedef struct VP8EncoderContext {
+    AVClass *class;
     struct vpx_codec_ctx encoder;
     struct vpx_image rawimg;
     struct vpx_fixed_buf twopass_stats;
     unsigned long deadline; //i.e., RT/GOOD/BEST
     struct FrameListData *coded_frame_list;
+    int cpu_used;
+    int auto_alt_ref;
+    int arnr_max_frames;
+    int arnr_strength;
+    int arnr_type;
+    int lag_in_frames;
+    int error_resilient;
 } VP8Context;
 
 /** String mappings for enum vp8e_enc_control_id */
@@ -205,7 +215,6 @@ static av_cold int vp8_init(AVCodecContext *avctx)
 {
     VP8Context *ctx = avctx->priv_data;
     const struct vpx_codec_iface *iface = &vpx_codec_vp8_cx_algo;
-    int cpuused = 3;
     struct vpx_codec_enc_cfg enccfg;
     int res;
 
@@ -225,6 +234,9 @@ static av_cold int vp8_init(AVCodecContext *avctx)
     enccfg.g_timebase.den = avctx->time_base.den;
     enccfg.g_threads      = avctx->thread_count;
 
+    if (ctx->lag_in_frames >= 0)
+        enccfg.g_lag_in_frames = ctx->lag_in_frames;
+
     if (avctx->flags & CODEC_FLAG_PASS1)
         enccfg.g_pass = VPX_RC_FIRST_PASS;
     else if (avctx->flags & CODEC_FLAG_PASS2)
@@ -292,13 +304,14 @@ static av_cold int vp8_init(AVCodecContext *avctx)
         enccfg.rc_twopass_stats_in = ctx->twopass_stats;
     }
 
-    ctx->deadline = VPX_DL_GOOD_QUALITY;
     /* 0-3: For non-zero values the encoder increasingly optimizes for reduced
        complexity playback on low powered devices at the expense of encode
        quality. */
    if (avctx->profile != FF_PROFILE_UNKNOWN)
        enccfg.g_profile = avctx->profile;
 
+    enccfg.g_error_resilient = ctx->error_resilient;
+
     dump_enc_cfg(avctx, &enccfg);
     /* Construct Encoder Context */
     res = vpx_codec_enc_init(&ctx->encoder, iface, &enccfg, 0);
@@ -309,7 +322,16 @@ static av_cold int vp8_init(AVCodecContext *avctx)
 
     //codec control failures are currently treated only as warnings
     av_log(avctx, AV_LOG_DEBUG, "vpx_codec_control\n");
-    codecctl_int(avctx, VP8E_SET_CPUUSED,           cpuused);
+    if (ctx->cpu_used != INT_MIN)
+        codecctl_int(avctx, VP8E_SET_CPUUSED,          ctx->cpu_used);
+    if (ctx->auto_alt_ref >= 0)
+        codecctl_int(avctx, VP8E_SET_ENABLEAUTOALTREF, ctx->auto_alt_ref);
+    if (ctx->arnr_max_frames >= 0)
+        codecctl_int(avctx, VP8E_SET_ARNR_MAXFRAMES,   ctx->arnr_max_frames);
+    if (ctx->arnr_strength >= 0)
+        codecctl_int(avctx, VP8E_SET_ARNR_STRENGTH,    ctx->arnr_strength);
+    if (ctx->arnr_type >= 0)
+        codecctl_int(avctx, VP8E_SET_ARNR_TYPE,        ctx->arnr_type);
     codecctl_int(avctx, VP8E_SET_NOISE_SENSITIVITY, avctx->noise_reduction);
     codecctl_int(avctx, VP8E_SET_TOKEN_PARTITIONS,  av_log2(avctx->slices));
     codecctl_int(avctx, VP8E_SET_STATIC_THRESHOLD,  avctx->mb_threshold);
@@ -496,6 +518,40 @@ static int vp8_encode(AVCodecContext *avctx, uint8_t *buf, int buf_size,
     return coded_size;
 }
 
+#define OFFSET(x) offsetof(VP8Context, x)
+#define VE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
+static const AVOption options[] = {
+    { "cpu-used",        "Quality/Speed ratio modifier",           OFFSET(cpu_used),        FF_OPT_TYPE_INT, {INT_MIN}, INT_MIN, INT_MAX, VE},
+    { "auto-alt-ref",    "Enable use of alternate reference "
+                         "frames (2-pass only)",                   OFFSET(auto_alt_ref),    FF_OPT_TYPE_INT, {-1},      -1,      1,       VE},
+    { "lag-in-frames",   "Number of frames to look ahead for "
+                         "alternate reference frame selection",    OFFSET(lag_in_frames),   FF_OPT_TYPE_INT, {-1},      -1,      INT_MAX, VE},
+    { "arnr-maxframes",  "altref noise reduction max frame count", OFFSET(arnr_max_frames), FF_OPT_TYPE_INT, {-1},      -1,      INT_MAX, VE},
+    { "arnr-strength",   "altref noise reduction filter strength", OFFSET(arnr_strength),   FF_OPT_TYPE_INT, {-1},      -1,      INT_MAX, VE},
+    { "arnr-type",       "altref noise reduction filter type",     OFFSET(arnr_type),       FF_OPT_TYPE_INT, {-1},      -1,      INT_MAX, VE, "arnr_type"},
+    { "backward",        NULL, 0, FF_OPT_TYPE_CONST, {1}, 0, 0, VE, "arnr_type" },
+    { "forward",         NULL, 0, FF_OPT_TYPE_CONST, {2}, 0, 0, VE, "arnr_type" },
+    { "centered",        NULL, 0, FF_OPT_TYPE_CONST, {3}, 0, 0, VE, "arnr_type" },
+    { "deadline",        "Time to spend encoding, in microseconds.", OFFSET(deadline),      FF_OPT_TYPE_INT, {VPX_DL_GOOD_QUALITY}, INT_MIN, INT_MAX, VE, "quality"},
+    { "best",            NULL, 0, FF_OPT_TYPE_CONST, {VPX_DL_BEST_QUALITY}, 0, 0, VE, "quality"},
+    { "good",            NULL, 0, FF_OPT_TYPE_CONST, {VPX_DL_GOOD_QUALITY}, 0, 0, VE, "quality"},
+    { "realtime",        NULL, 0, FF_OPT_TYPE_CONST, {VPX_DL_REALTIME},     0, 0, VE, "quality"},
+    { "error-resilient", "Error resilience configuration", OFFSET(error_resilient), FF_OPT_TYPE_FLAGS, {0}, INT_MIN, INT_MAX, VE, "er"},
+    { "default",         "Improve resiliency against losses of whole frames", 0, FF_OPT_TYPE_CONST, {VPX_ERROR_RESILIENT_DEFAULT}, 0, 0, VE, "er"},
+    { "partitions",      "The frame partitions are independently decodable "
+                         "by the bool decoder, meaning that partitions can be decoded even "
+                         "though earlier partitions have been lost. Note that intra predicition"
+                         " is still done over the partition boundary.",       0, FF_OPT_TYPE_CONST, {VPX_ERROR_RESILIENT_PARTITIONS}, 0, 0, VE, "er"},
+    { NULL }
+};
+
+static const AVClass class = {
+    .class_name = "libvpx encoder",
+    .item_name  = av_default_item_name,
+    .option     = options,
+    .version    = LIBAVUTIL_VERSION_INT,
+};
+
 AVCodec ff_libvpx_encoder = {
     .name           = "libvpx",
     .type           = AVMEDIA_TYPE_VIDEO,
@@ -507,4 +563,5 @@ AVCodec ff_libvpx_encoder = {
     .capabilities   = CODEC_CAP_DELAY,
     .pix_fmts = (const enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_NONE},
     .long_name = NULL_IF_CONFIG_SMALL("libvpx VP8"),
+    .priv_class = &class,
 };