early-access version 1432

externals/ffmpeg/libavcodec/remove_extradata_bsf.c

@@ -0,0 +1,118 @@
+/*
+ * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
+ *
+ * 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/log.h"
+#include "libavutil/opt.h"
+
+#include "avcodec.h"
+#include "bsf.h"
+#include "bsf_internal.h"
+
+enum RemoveFreq {
+    REMOVE_FREQ_KEYFRAME,
+    REMOVE_FREQ_ALL,
+    REMOVE_FREQ_NONKEYFRAME,
+};
+
+typedef struct RemoveExtradataContext {
+    const AVClass *class;
+    int freq;
+
+    AVCodecParserContext *parser;
+    AVCodecContext *avctx;
+} RemoveExtradataContext;
+
+static int remove_extradata(AVBSFContext *ctx, AVPacket *pkt)
+{
+    RemoveExtradataContext *s = ctx->priv_data;
+
+    int ret;
+
+    ret = ff_bsf_get_packet_ref(ctx, pkt);
+    if (ret < 0)
+        return ret;
+
+    if (s->parser && s->parser->parser->split) {
+        if (s->freq == REMOVE_FREQ_ALL ||
+            (s->freq == REMOVE_FREQ_NONKEYFRAME && !(pkt->flags & AV_PKT_FLAG_KEY)) ||
+            (s->freq == REMOVE_FREQ_KEYFRAME && pkt->flags & AV_PKT_FLAG_KEY)) {
+            int i = s->parser->parser->split(s->avctx, pkt->data, pkt->size);
+            pkt->data += i;
+            pkt->size -= i;
+        }
+    }
+
+    return 0;
+}
+
+static int remove_extradata_init(AVBSFContext *ctx)
+{
+    RemoveExtradataContext *s = ctx->priv_data;
+    int ret;
+
+    s->parser = av_parser_init(ctx->par_in->codec_id);
+
+    if (s->parser) {
+        s->avctx = avcodec_alloc_context3(NULL);
+        if (!s->avctx)
+            return AVERROR(ENOMEM);
+
+        ret = avcodec_parameters_to_context(s->avctx, ctx->par_in);
+        if (ret < 0)
+            return ret;
+    }
+
+    return 0;
+}
+
+static void remove_extradata_close(AVBSFContext *ctx)
+{
+    RemoveExtradataContext *s = ctx->priv_data;
+
+    avcodec_free_context(&s->avctx);
+    av_parser_close(s->parser);
+}
+
+#define OFFSET(x) offsetof(RemoveExtradataContext, x)
+#define FLAGS (AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_BSF_PARAM)
+static const AVOption options[] = {
+    { "freq", NULL, OFFSET(freq), AV_OPT_TYPE_INT, { .i64 = REMOVE_FREQ_KEYFRAME }, REMOVE_FREQ_KEYFRAME, REMOVE_FREQ_NONKEYFRAME, FLAGS, "freq" },
+        { "k",        NULL, 0, AV_OPT_TYPE_CONST, { .i64 = REMOVE_FREQ_NONKEYFRAME }, .flags = FLAGS, .unit = "freq" },
+        { "keyframe", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = REMOVE_FREQ_KEYFRAME }, .flags = FLAGS, .unit = "freq" },
+        { "e",        NULL, 0, AV_OPT_TYPE_CONST, { .i64 = REMOVE_FREQ_ALL      }, .flags = FLAGS, .unit = "freq" },
+        { "all",      NULL, 0, AV_OPT_TYPE_CONST, { .i64 = REMOVE_FREQ_ALL      }, .flags = FLAGS, .unit = "freq" },
+    { NULL },
+};
+
+static const AVClass remove_extradata_class = {
+    .class_name = "remove_extradata",
+    .item_name  = av_default_item_name,
+    .option     = options,
+    .version    = LIBAVUTIL_VERSION_INT,
+};
+
+const AVBitStreamFilter ff_remove_extradata_bsf = {
+    .name           = "remove_extra",
+    .priv_data_size = sizeof(RemoveExtradataContext),
+    .priv_class     = &remove_extradata_class,
+    .init           = remove_extradata_init,
+    .close          = remove_extradata_close,
+    .filter         = remove_extradata,
+};