From 33d18982fa03feb061c8f744a4f0a9175c1f63ab Mon Sep 17 00:00:00 2001
From: Anton Khirnov <anton@khirnov.net>
Date: Sat, 23 Nov 2013 11:43:13 +0100
Subject: lavc: add a new bitstream filtering API

Deprecate the current bitstream filtering API.
---
 libavcodec/remove_extradata_bsf.c | 110 +++++++++++++++++++++++++++++---------
 1 file changed, 85 insertions(+), 25 deletions(-)

(limited to 'libavcodec/remove_extradata_bsf.c')

diff --git a/libavcodec/remove_extradata_bsf.c b/libavcodec/remove_extradata_bsf.c
index b82c867f43..a89fa06e61 100644
--- a/libavcodec/remove_extradata_bsf.c
+++ b/libavcodec/remove_extradata_bsf.c
@@ -18,39 +18,99 @@
  * 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"
 
+enum RemoveFreq {
+    REMOVE_FREQ_KEYFRAME,
+    REMOVE_FREQ_ALL,
+};
 
-static int remove_extradata(AVBitStreamFilterContext *bsfc, AVCodecContext *avctx, const char *args,
-                     uint8_t **poutbuf, int *poutbuf_size,
-                     const uint8_t *buf, int buf_size, int keyframe){
-    int cmd= args ? *args : 0;
-    AVCodecParserContext *s;
+typedef struct RemoveExtradataContext {
+    const AVClass *class;
+    int freq;
 
-    if(!bsfc->parser){
-        bsfc->parser= av_parser_init(avctx->codec_id);
-    }
-    s= bsfc->parser;
-
-    if(s && s->parser->split){
-        if(  (((avctx->flags & AV_CODEC_FLAG_GLOBAL_HEADER) ||
-               (avctx->flags2 & AV_CODEC_FLAG2_LOCAL_HEADER)) && cmd == 'a')
-           ||(!keyframe && cmd=='k')
-           ||(cmd=='e' || !cmd)
-          ){
-            int i= s->parser->split(avctx, buf, buf_size);
-            buf += i;
-            buf_size -= i;
+    AVCodecParserContext *parser;
+    AVCodecContext *avctx;
+} RemoveExtradataContext;
+
+static int remove_extradata(AVBSFContext *ctx, AVPacket *out)
+{
+    RemoveExtradataContext *s = ctx->priv_data;
+
+    AVPacket *in;
+    int ret;
+
+    ret = ff_bsf_get_packet(ctx, &in);
+    if (ret < 0)
+        return ret;
+
+    if (s->parser && s->parser->parser->split) {
+        if (s->freq == REMOVE_FREQ_ALL ||
+            (s->freq == REMOVE_FREQ_KEYFRAME && in->flags & AV_PKT_FLAG_KEY)) {
+            int i = s->parser->parser->split(s->avctx, in->data, in->size);
+            in->data += i;
+            in->size -= i;
         }
     }
-    *poutbuf= (uint8_t *) buf;
-    *poutbuf_size= buf_size;
+
+    av_packet_move_ref(out, in);
+    av_packet_free(&in);
 
     return 0;
 }
 
-AVBitStreamFilter ff_remove_extradata_bsf={
-    "remove_extra",
-    0,
-    remove_extradata,
+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)
+static const AVOption options[] = {
+    { "freq", NULL, OFFSET(freq), AV_OPT_TYPE_INT, { .i64 = REMOVE_FREQ_KEYFRAME }, REMOVE_FREQ_KEYFRAME, REMOVE_FREQ_ALL, 0, "freq" },
+        { "keyframe", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = REMOVE_FREQ_KEYFRAME }, .unit = "freq" },
+        { "all",      NULL, 0, AV_OPT_TYPE_CONST, { .i64 = REMOVE_FREQ_ALL      }, .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,
 };
-- 
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