h264_metadata: Add option to set the level of the stream

[ffmpeg] / libavcodec / h264_metadata_bsf.c

diff --git a/libavcodec/h264_metadata_bsf.c b/libavcodec/h264_metadata_bsf.c
index 27053dbdcfa4baf85a3f8e714e651826fac51aad..991fcfa537d8bf834bc83727d1e7aa4ccc329794 100644 (file)
--- a/libavcodec/h264_metadata_bsf.c
+++ b/libavcodec/h264_metadata_bsf.c
@@ -25,6 +25,7 @@
 #include "cbs.h"
 #include "cbs_h264.h"
 #include "h264.h"
+#include "h264_levels.h"
 #include "h264_sei.h"
 
 enum {
@@ -39,6 +40,11 @@ enum {
     FLIP_VERTICAL   = 2,
 };
 
+enum {
+    LEVEL_UNSET = -2,
+    LEVEL_AUTO  = -1,
+};
+
 typedef struct H264MetadataContext {
     const AVClass *class;
 
@@ -74,6 +80,8 @@ typedef struct H264MetadataContext {
     int display_orientation;
     double rotate;
     int flip;
+
+    int level;
 } H264MetadataContext;
 
 
@@ -208,6 +216,58 @@ static int h264_metadata_update_sps(AVBSFContext *bsf,
     CROP(bottom, crop_unit_y);
 #undef CROP
 
+    if (ctx->level != LEVEL_UNSET) {
+        int level_idc;
+
+        if (ctx->level == LEVEL_AUTO) {
+            const H264LevelDescriptor *desc;
+            int64_t bit_rate;
+            int width, height;
+
+            if (sps->vui.nal_hrd_parameters_present_flag) {
+                bit_rate = (sps->vui.nal_hrd_parameters.bit_rate_value_minus1[0] + 1) *
+                     (1 << (sps->vui.nal_hrd_parameters.bit_rate_scale + 6));
+            } else if (sps->vui.vcl_hrd_parameters_present_flag) {
+                bit_rate = (sps->vui.vcl_hrd_parameters.bit_rate_value_minus1[0] + 1) *
+                     (1 << (sps->vui.vcl_hrd_parameters.bit_rate_scale + 6));
+                // Adjust for VCL vs. NAL limits.
+                bit_rate = bit_rate * 6 / 5;
+            } else {
+                bit_rate = 0;
+            }
+
+            width  = 16 * (sps->pic_width_in_mbs_minus1 + 1);
+            height = 16 * (sps->pic_height_in_map_units_minus1 + 1) *
+                (2 - sps->frame_mbs_only_flag);
+
+            desc = ff_h264_guess_level(sps->profile_idc, bit_rate,
+                                       width, height,
+                                       sps->vui.max_dec_frame_buffering);
+            if (desc) {
+                level_idc = desc->level_idc;
+            } else {
+                av_log(bsf, AV_LOG_WARNING, "Stream does not appear to "
+                       "conform to any level: using level 6.2.\n");
+                level_idc = 62;
+            }
+        } else {
+            level_idc = ctx->level;
+        }
+
+        if (level_idc == 9) {
+            if (sps->profile_idc == 66 ||
+                sps->profile_idc == 77 ||
+                sps->profile_idc == 88) {
+                sps->level_idc = 10;
+                sps->constraint_set3_flag = 1;
+            } else {
+                sps->level_idc = 9;
+            }
+        } else {
+            sps->level_idc = level_idc;
+        }
+    }
+
     if (need_vui)
         sps->vui_parameters_present_flag = 1;
 
@@ -220,6 +280,7 @@ static int h264_metadata_filter(AVBSFContext *bsf, AVPacket *out)
     AVPacket *in = NULL;
     CodedBitstreamFragment *au = &ctx->access_unit;
     int err, i, j, has_sps;
+    H264RawAUD aud;
     uint8_t *displaymatrix_side_data = NULL;
     size_t displaymatrix_side_data_size = 0;
 
@@ -256,9 +317,6 @@ static int h264_metadata_filter(AVBSFContext *bsf, AVPacket *out)
                 0x3ff, // 0, 1, 2, 3, 4, 5, 6, 7, 8, 9
             };
             int primary_pic_type_mask = 0xff;
-            H264RawAUD aud = {
-                .nal_unit_header.nal_unit_type = H264_NAL_AUD,
-            };
 
             for (i = 0; i < au->nb_units; i++) {
                 if (au->units[i].type == H264_NAL_SLICE ||
@@ -281,7 +339,10 @@ static int h264_metadata_filter(AVBSFContext *bsf, AVPacket *out)
                 goto fail;
             }
 
-            aud.primary_pic_type = j;
+            aud = (H264RawAUD) {
+                .nal_unit_header.nal_unit_type = H264_NAL_AUD,
+                .primary_pic_type = j,
+            };
 
             err = ff_cbs_insert_unit_content(ctx->cbc, au,
                                              0, H264_NAL_AUD, &aud, NULL);
@@ -341,8 +402,6 @@ static int h264_metadata_filter(AVBSFContext *bsf, AVPacket *out)
             udu->data_length = len + 1;
             memcpy(udu->data, ctx->sei_user_data + i + 1, len + 1);
 
-            payload.payload_size = 16 + udu->data_length;
-
             err = ff_cbs_h264_add_sei_message(ctx->cbc, au, &payload);
             if (err < 0) {
                 av_log(bsf, AV_LOG_ERROR, "Failed to add user data SEI "
@@ -684,6 +743,36 @@ static const AVOption h264_metadata_options[] = {
         0, AV_OPT_TYPE_CONST,
         { .i64 = FLIP_VERTICAL },   .flags = FLAGS, .unit = "flip" },
 
+    { "level", "Set level (table A-1)",
+        OFFSET(level), AV_OPT_TYPE_INT,
+        { .i64 = LEVEL_UNSET }, LEVEL_UNSET, 0xff, FLAGS, "level" },
+    { "auto", "Attempt to guess level from stream properties",
+        0, AV_OPT_TYPE_CONST,
+        { .i64 = LEVEL_AUTO }, .flags = FLAGS, .unit = "level" },
+#define LEVEL(name, value) name, NULL, 0, AV_OPT_TYPE_CONST, \
+        { .i64 = value },      .flags = FLAGS, .unit = "level"
+    { LEVEL("1",   10) },
+    { LEVEL("1b",   9) },
+    { LEVEL("1.1", 11) },
+    { LEVEL("1.2", 12) },
+    { LEVEL("1.3", 13) },
+    { LEVEL("2",   20) },
+    { LEVEL("2.1", 21) },
+    { LEVEL("2.2", 22) },
+    { LEVEL("3",   30) },
+    { LEVEL("3.1", 31) },
+    { LEVEL("3.2", 32) },
+    { LEVEL("4",   40) },
+    { LEVEL("4.1", 41) },
+    { LEVEL("4.2", 42) },
+    { LEVEL("5",   50) },
+    { LEVEL("5.1", 51) },
+    { LEVEL("5.2", 52) },
+    { LEVEL("6",   60) },
+    { LEVEL("6.1", 61) },
+    { LEVEL("6.2", 62) },
+#undef LEVEL
+
     { NULL }
 };