lavc: Add AV1 metadata bitstream filter

Can adjust colour and timing information.

1 files changed, 267 insertions, 0 deletions

diff --git a/libavcodec/av1_metadata_bsf.c b/libavcodec/av1_metadata_bsf.c
new file mode 100644
index 0000000000..ed2f018fb6
--- /dev/null
+++ b/libavcodec/av1_metadata_bsf.c
@@ -0,0 +1,267 @@
+/*
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "libavutil/common.h"
+#include "libavutil/opt.h"
+
+#include "bsf.h"
+#include "cbs.h"
+#include "cbs_av1.h"
+
+typedef struct AV1MetadataContext {
+    const AVClass *class;
+
+    CodedBitstreamContext *cbc;
+    CodedBitstreamFragment access_unit;
+
+    int color_primaries;
+    int transfer_characteristics;
+    int matrix_coefficients;
+
+    int color_range;
+    int chroma_sample_position;
+
+    AVRational tick_rate;
+    int num_ticks_per_picture;
+} AV1MetadataContext;
+
+
+static int av1_metadata_update_sequence_header(AVBSFContext *bsf,
+                                               AV1RawSequenceHeader *seq)
+{
+    AV1MetadataContext *ctx = bsf->priv_data;
+    AV1RawColorConfig  *clc = &seq->color_config;
+    AV1RawTimingInfo   *tim = &seq->timing_info;
+
+    if (ctx->color_primaries >= 0          ||
+        ctx->transfer_characteristics >= 0 ||
+        ctx->matrix_coefficients >= 0) {
+        if (!clc->color_description_present_flag) {
+            clc->color_description_present_flag = 1;
+            clc->color_primaries          = AVCOL_PRI_UNSPECIFIED;
+            clc->transfer_characteristics = AVCOL_TRC_UNSPECIFIED;
+            clc->matrix_coefficients      = AVCOL_SPC_UNSPECIFIED;
+        }
+
+        if (ctx->color_primaries >= 0)
+            clc->color_primaries = ctx->color_primaries;
+        if (ctx->transfer_characteristics >= 0)
+            clc->transfer_characteristics = ctx->transfer_characteristics;
+        if (ctx->matrix_coefficients >= 0)
+            clc->matrix_coefficients = ctx->matrix_coefficients;
+    }
+
+    if (ctx->color_range >= 0) {
+        if (clc->color_primaries          == AVCOL_PRI_BT709        &&
+            clc->transfer_characteristics == AVCOL_TRC_IEC61966_2_1 &&
+            clc->matrix_coefficients      == AVCOL_SPC_RGB) {
+            av_log(bsf, AV_LOG_WARNING, "Warning: color_range cannot be set "
+                   "on RGB streams encoded in BT.709 sRGB.\n");
+        } else {
+            clc->color_range = ctx->color_range;
+        }
+    }
+
+    if (ctx->chroma_sample_position >= 0) {
+        if (clc->mono_chrome) {
+            av_log(bsf, AV_LOG_WARNING, "Warning: chroma_sample_position "
+                   "is not meaningful for monochrome streams.\n");
+        } else if (clc->subsampling_x == 0 &&
+                   clc->subsampling_y == 0) {
+            av_log(bsf, AV_LOG_WARNING, "Warning: chroma_sample_position "
+                   "is not meaningful for non-chroma-subsampled streams.\n");
+        } else {
+            clc->chroma_sample_position = ctx->chroma_sample_position;
+        }
+    }
+
+    if (ctx->tick_rate.num && ctx->tick_rate.den) {
+        int num, den;
+
+        av_reduce(&num, &den, ctx->tick_rate.num, ctx->tick_rate.den,
+                  UINT32_MAX > INT_MAX ? UINT32_MAX : INT_MAX);
+
+        tim->time_scale                = num;
+        tim->num_units_in_display_tick = den;
+        seq->timing_info_present_flag  = 1;
+
+        if (ctx->num_ticks_per_picture > 0) {
+            tim->equal_picture_interval = 1;
+            tim->num_ticks_per_picture_minus_1 =
+                ctx->num_ticks_per_picture - 1;
+        }
+    }
+
+    return 0;
+}
+
+static int av1_metadata_filter(AVBSFContext *bsf, AVPacket *out)
+{
+    AV1MetadataContext *ctx = bsf->priv_data;
+    AVPacket *in = NULL;
+    CodedBitstreamFragment *frag = &ctx->access_unit;
+    AV1RawOBU *obu;
+    int err, i;
+
+    err = ff_bsf_get_packet(bsf, &in);
+    if (err < 0)
+        return err;
+
+    err = ff_cbs_read_packet(ctx->cbc, frag, in);
+    if (err < 0) {
+        av_log(bsf, AV_LOG_ERROR, "Failed to read packet.\n");
+        goto fail;
+    }
+
+    for (i = 0; i < frag->nb_units; i++) {
+        if (frag->units[i].type == AV1_OBU_SEQUENCE_HEADER) {
+            obu = frag->units[i].content;
+            err = av1_metadata_update_sequence_header(bsf, &obu->obu.sequence_header);
+            if (err < 0)
+                goto fail;
+        }
+    }
+
+    err = ff_cbs_write_packet(ctx->cbc, out, frag);
+    if (err < 0) {
+        av_log(bsf, AV_LOG_ERROR, "Failed to write packet.\n");
+        goto fail;
+    }
+
+    err = av_packet_copy_props(out, in);
+    if (err < 0)
+        goto fail;
+
+    err = 0;
+fail:
+    ff_cbs_fragment_uninit(ctx->cbc, frag);
+
+    if (err < 0)
+        av_packet_unref(out);
+    av_packet_free(&in);
+
+    return err;
+}
+
+static int av1_metadata_init(AVBSFContext *bsf)
+{
+    AV1MetadataContext *ctx = bsf->priv_data;
+    CodedBitstreamFragment *frag = &ctx->access_unit;
+    AV1RawOBU *obu;
+    int err, i;
+
+    err = ff_cbs_init(&ctx->cbc, AV_CODEC_ID_AV1, bsf);
+    if (err < 0)
+        return err;
+
+    if (bsf->par_in->extradata) {
+        err = ff_cbs_read_extradata(ctx->cbc, frag, bsf->par_in);
+        if (err < 0) {
+            av_log(bsf, AV_LOG_ERROR, "Failed to read extradata.\n");
+            goto fail;
+        }
+
+        for (i = 0; i < frag->nb_units; i++) {
+            if (frag->units[i].type == AV1_OBU_SEQUENCE_HEADER) {
+                obu = frag->units[i].content;
+                err = av1_metadata_update_sequence_header(bsf, &obu->obu.sequence_header);
+                if (err < 0)
+                    goto fail;
+            }
+        }
+
+        err = ff_cbs_write_extradata(ctx->cbc, bsf->par_out, frag);
+        if (err < 0) {
+            av_log(bsf, AV_LOG_ERROR, "Failed to write extradata.\n");
+            goto fail;
+        }
+    }
+
+    err = 0;
+fail:
+    ff_cbs_fragment_uninit(ctx->cbc, frag);
+    return err;
+}
+
+static void av1_metadata_close(AVBSFContext *bsf)
+{
+    AV1MetadataContext *ctx = bsf->priv_data;
+    ff_cbs_close(&ctx->cbc);
+}
+
+#define OFFSET(x) offsetof(AV1MetadataContext, x)
+#define FLAGS (AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_BSF_PARAM)
+static const AVOption av1_metadata_options[] = {
+    { "color_primaries", "Set color primaries (section 6.4.2)",
+        OFFSET(color_primaries), AV_OPT_TYPE_INT,
+        { .i64 = -1 }, -1, 255, FLAGS },
+    { "transfer_characteristics", "Set transfer characteristics (section 6.4.2)",
+        OFFSET(transfer_characteristics), AV_OPT_TYPE_INT,
+        { .i64 = -1 }, -1, 255, FLAGS },
+    { "matrix_coefficients", "Set matrix coefficients (section 6.4.2)",
+        OFFSET(matrix_coefficients), AV_OPT_TYPE_INT,
+        { .i64 = -1 }, -1, 255, FLAGS },
+
+    { "color_range", "Set color range flag (section 6.4.2)",
+        OFFSET(color_range), AV_OPT_TYPE_INT,
+        { .i64 = -1 }, -1, 1, FLAGS, "cr" },
+    { "tv", "TV (limited) range", 0, AV_OPT_TYPE_CONST,
+        { .i64 = 0 }, .flags = FLAGS, .unit = "cr" },
+    { "pc", "PC (full) range",    0, AV_OPT_TYPE_CONST,
+        { .i64 = 1 }, .flags = FLAGS, .unit = "cr" },
+
+    { "chroma_sample_position", "Set chroma sample position (section 6.4.2)",
+        OFFSET(chroma_sample_position), AV_OPT_TYPE_INT,
+        { .i64 = -1 }, -1, 3, FLAGS, "csp" },
+    { "unknown",   "Unknown chroma sample position",  0, AV_OPT_TYPE_CONST,
+        { .i64 = AV1_CSP_UNKNOWN },   .flags = FLAGS, .unit = "csp" },
+    { "vertical",  "Left chroma sample position",     0, AV_OPT_TYPE_CONST,
+        { .i64 = AV1_CSP_VERTICAL },  .flags = FLAGS, .unit = "csp" },
+    { "colocated", "Top-left chroma sample position", 0, AV_OPT_TYPE_CONST,
+        { .i64 = AV1_CSP_COLOCATED }, .flags = FLAGS, .unit = "csp" },
+
+    { "tick_rate", "Set display tick rate (num_units_in_display_tick / time_scale)",
+        OFFSET(tick_rate), AV_OPT_TYPE_RATIONAL,
+        { .dbl = 0.0 }, 0, UINT_MAX, FLAGS },
+    { "num_ticks_per_picture", "Set display ticks per picture for CFR streams",
+        OFFSET(num_ticks_per_picture), AV_OPT_TYPE_INT,
+        { .i64 = -1 }, -1, INT_MAX, FLAGS },
+
+    { NULL }
+};
+
+static const AVClass av1_metadata_class = {
+    .class_name = "av1_metadata_bsf",
+    .item_name  = av_default_item_name,
+    .option     = av1_metadata_options,
+    .version    = LIBAVUTIL_VERSION_INT,
+};
+
+static const enum AVCodecID av1_metadata_codec_ids[] = {
+    AV_CODEC_ID_AV1, AV_CODEC_ID_NONE,
+};
+
+const AVBitStreamFilter ff_av1_metadata_bsf = {
+    .name           = "av1_metadata",
+    .priv_data_size = sizeof(AV1MetadataContext),
+    .priv_class     = &av1_metadata_class,
+    .init           = &av1_metadata_init,
+    .close          = &av1_metadata_close,
+    .filter         = &av1_metadata_filter,
+    .codec_ids      = av1_metadata_codec_ids,
+};