---
libavformat/avformat.h | 8 ++++++++
libavformat/utils.c | 49 +++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 57 insertions(+)
diff --git a/libavformat/avformat.h b/libavformat/avformat.h
index 5283085..96d3cfd 100644
--- a/libavformat/avformat.h
+++ b/libavformat/avformat.h
@@ -2738,6 +2738,14 @@ int avformat_match_stream_specifier(AVFormatContext *s,
AVStream *st,
int avformat_queue_attached_pictures(AVFormatContext *s);
+/**
+ * Apply a list of bitstream filters to a packet.
+ *
+ * @return >=0 on success;
+ * AVERROR code on failure
+ */
+int av_apply_bitstream_filters(AVFormatContext *s, AVPacket *pkt,
+ AVBitStreamFilterContext *bsfc);
/**
* @}
diff --git a/libavformat/utils.c b/libavformat/utils.c
index 9399489..3ed7935 100644
--- a/libavformat/utils.c
+++ b/libavformat/utils.c
@@ -4630,3 +4630,52 @@ uint8_t *ff_stream_new_side_data(AVStream *st, enum
AVPacketSideDataType type,
sd->size = size;
return data;
}
+
+int av_apply_bitstream_filters(AVFormatContext *s, AVPacket *pkt,
+ AVBitStreamFilterContext *bsfc)
+{
+ int ret = 0;
+ AVStream *st = s->streams[pkt->stream_index];
+ while (bsfc) {
+ AVPacket new_pkt = *pkt;
+ int a = av_bitstream_filter_filter(bsfc, st->codec, NULL,
+ &new_pkt.data, &new_pkt.size,
+ pkt->data, pkt->size,
+ pkt->flags & AV_PKT_FLAG_KEY);
+ if(a == 0 && new_pkt.data != pkt->data) {
+ uint8_t *t = av_malloc(new_pkt.size +
AV_INPUT_BUFFER_PADDING_SIZE); //the new should be a subset of the old so
cannot overflow
+ if (t) {
+ memcpy(t, new_pkt.data, new_pkt.size);
+ memset(t + new_pkt.size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
+ new_pkt.data = t;
+ new_pkt.buf = NULL;
+ a = 1;
+ } else {
+ a = AVERROR(ENOMEM);
+ }
+ }
+ if (a > 0) {
+ new_pkt.buf = av_buffer_create(new_pkt.data, new_pkt.size,
+ av_buffer_default_free, NULL, 0);
+ if (new_pkt.buf) {
+ pkt->side_data = NULL;
+ pkt->side_data_elems = 0;
+ av_packet_unref(pkt);
+ } else {
+ av_freep(&new_pkt.data);
+ a = AVERROR(ENOMEM);
+ }
+ }
+ if (a < 0) {
+ av_log(s, AV_LOG_ERROR, "Failed to open bitstream filter %s for
stream %d with codec %s",
+ bsfc->filter->name, pkt->stream_index,
+ st->codec->codec ? st->codec->codec->name : "copy");
+ ret = a;
+ break;
+ }
+ *pkt = new_pkt;
+
+ bsfc = bsfc->next;
+ }
+ return ret;
+}
--
2.6.3
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