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Diffstat (limited to 'media/ffvpx/libavcodec/vp9_superframe_split_bsf.c')
-rw-r--r--media/ffvpx/libavcodec/vp9_superframe_split_bsf.c147
1 files changed, 147 insertions, 0 deletions
diff --git a/media/ffvpx/libavcodec/vp9_superframe_split_bsf.c b/media/ffvpx/libavcodec/vp9_superframe_split_bsf.c
new file mode 100644
index 000000000..9c4aa33dc
--- /dev/null
+++ b/media/ffvpx/libavcodec/vp9_superframe_split_bsf.c
@@ -0,0 +1,147 @@
+/*
+ * 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
+ */
+
+/**
+ * @file
+ * This bitstream filter splits VP9 superframes into packets containing
+ * just one frame.
+ */
+
+#include <stddef.h>
+
+#include "avcodec.h"
+#include "bsf.h"
+#include "bytestream.h"
+#include "get_bits.h"
+
+typedef struct VP9SFSplitContext {
+ AVPacket buffer_pkt;
+
+ int nb_frames;
+ int next_frame;
+ size_t next_frame_offset;
+ int sizes[8];
+} VP9SFSplitContext;
+
+static int vp9_superframe_split_filter(AVBSFContext *ctx, AVPacket *out)
+{
+ VP9SFSplitContext *s = ctx->priv_data;
+ AVPacket *in;
+ int i, j, ret, marker;
+ int is_superframe = !!s->buffer_pkt.data;
+
+ if (!s->buffer_pkt.data) {
+ ret = ff_bsf_get_packet_ref(ctx, &s->buffer_pkt);
+ if (ret < 0)
+ return ret;
+ in = &s->buffer_pkt;
+
+ marker = in->data[in->size - 1];
+ if ((marker & 0xe0) == 0xc0) {
+ int length_size = 1 + ((marker >> 3) & 0x3);
+ int nb_frames = 1 + (marker & 0x7);
+ int idx_size = 2 + nb_frames * length_size;
+
+ if (in->size >= idx_size && in->data[in->size - idx_size] == marker) {
+ GetByteContext bc;
+ int64_t total_size = 0;
+
+ bytestream2_init(&bc, in->data + in->size + 1 - idx_size,
+ nb_frames * length_size);
+
+ for (i = 0; i < nb_frames; i++) {
+ int frame_size = 0;
+ for (j = 0; j < length_size; j++)
+ frame_size |= bytestream2_get_byte(&bc) << (j * 8);
+
+ total_size += frame_size;
+ if (frame_size < 0 || total_size > in->size - idx_size) {
+ av_log(ctx, AV_LOG_ERROR,
+ "Invalid frame size in a superframe: %d\n", frame_size);
+ ret = AVERROR(EINVAL);
+ goto fail;
+ }
+ s->sizes[i] = frame_size;
+ }
+ s->nb_frames = nb_frames;
+ s->next_frame = 0;
+ s->next_frame_offset = 0;
+ is_superframe = 1;
+ }
+ }
+ }
+
+ if (is_superframe) {
+ GetBitContext gb;
+ int profile, invisible = 0;
+
+ ret = av_packet_ref(out, &s->buffer_pkt);
+ if (ret < 0)
+ goto fail;
+
+ out->data += s->next_frame_offset;
+ out->size = s->sizes[s->next_frame];
+
+ s->next_frame_offset += out->size;
+ s->next_frame++;
+
+ if (s->next_frame >= s->nb_frames)
+ av_packet_unref(&s->buffer_pkt);
+
+ ret = init_get_bits8(&gb, out->data, out->size);
+ if (ret < 0)
+ goto fail;
+
+ get_bits(&gb, 2); // frame_marker
+ profile = get_bits1(&gb);
+ profile |= get_bits1(&gb) << 1;
+ if (profile == 3)
+ get_bits1(&gb);
+ if (!get_bits1(&gb)) {
+ get_bits1(&gb);
+ invisible = !get_bits1(&gb);
+ }
+
+ if (invisible)
+ out->pts = AV_NOPTS_VALUE;
+
+ } else {
+ av_packet_move_ref(out, &s->buffer_pkt);
+ }
+
+ return 0;
+fail:
+ if (ret < 0)
+ av_packet_unref(out);
+ av_packet_unref(&s->buffer_pkt);
+ return ret;
+}
+
+static void vp9_superframe_split_uninit(AVBSFContext *ctx)
+{
+ VP9SFSplitContext *s = ctx->priv_data;
+ av_packet_unref(&s->buffer_pkt);
+}
+
+const AVBitStreamFilter ff_vp9_superframe_split_bsf = {
+ .name = "vp9_superframe_split",
+ .priv_data_size = sizeof(VP9SFSplitContext),
+ .close = vp9_superframe_split_uninit,
+ .filter = vp9_superframe_split_filter,
+ .codec_ids = (const enum AVCodecID []){ AV_CODEC_ID_VP9, AV_CODEC_ID_NONE },
+};