[FFmpeg-devel] [PATCH] avcodec/bsf/h264_mp4toannexb.c: change extradata to annexb if this is avcc.

[jiangjie <jiangjie618@gmail.com>]

if get AV_PKT_DATA_NEW_EXTRADATA in AVPacket, this bitstream filter will return an error.
ffmpeg -i rtmp://xxx/live/xxx -bsf:v "h264_mp4toannexb,h264_metadata=aud=remove" -c copy -f null -
---
 libavcodec/bsf/h264_mp4toannexb.c             | 26 ++++++++++++++-----
 tests/fate/h264.mak                           |  3 +++
 .../fate/h264-bsf-mp4toannexb-h264_metadata   | 12 +++++++++
 3 files changed, 35 insertions(+), 6 deletions(-)
 create mode 100644 tests/ref/fate/h264-bsf-mp4toannexb-h264_metadata

diff --git a/libavcodec/bsf/h264_mp4toannexb.c b/libavcodec/bsf/h264_mp4toannexb.c
index dda064287e..42a5a274bf 100644
--- a/libavcodec/bsf/h264_mp4toannexb.c
+++ b/libavcodec/bsf/h264_mp4toannexb.c
@@ -252,14 +252,21 @@ static int h264_mp4toannexb_filter_ps(H264BSFContext *s,
     return 0;
 }
 
+static int is_annexb(const uint8_t *extradata, int extra_size) {
+    if (!extra_size || (extra_size >= 3 && AV_RB24(extradata) == 1) ||
+        (extra_size >= 4 && AV_RB32(extradata) == 1)) {
+        return 1;
+    } else {
+        return 0;
+    }
+}
+
 static int h264_mp4toannexb_init(AVBSFContext *ctx)
 {
     int extra_size = ctx->par_in->extradata_size;
 
     /* retrieve sps and pps NAL units from extradata */
-    if (!extra_size                                               ||
-        (extra_size >= 3 && AV_RB24(ctx->par_in->extradata) == 1) ||
-        (extra_size >= 4 && AV_RB32(ctx->par_in->extradata) == 1)) {
+    if (is_annexb(ctx->par_in->extradata, extra_size)) {
         av_log(ctx, AV_LOG_VERBOSE,
                "The input looks like it is Annex B already\n");
     } else if (extra_size >= 7) {
@@ -294,9 +301,16 @@ static int h264_mp4toannexb_filter(AVBSFContext *ctx, AVPacket *opkt)
     extradata = av_packet_get_side_data(in, AV_PKT_DATA_NEW_EXTRADATA,
                                         &extradata_size);
     if (extradata) {
-        ret = h264_extradata_to_annexb(ctx, extradata, extradata_size);
-        if (ret < 0)
-            goto fail;
+        if (!is_annexb(extradata, extradata_size) && extradata_size >= 7) {
+            ret = h264_extradata_to_annexb(ctx, extradata, extradata_size);
+            if (ret < 0)
+                goto fail;
+            av_packet_side_data_remove(in->side_data, &in->side_data_elems,
+                                       AV_PKT_DATA_NEW_EXTRADATA);
+            uint8_t *data = av_packet_new_side_data(
+                in, AV_PKT_DATA_NEW_EXTRADATA, ctx->par_out->extradata_size);
+            memcpy(data, ctx->par_out->extradata, ctx->par_out->extradata_size);
+        }
     }
 
     /* nothing to filter */
diff --git a/tests/fate/h264.mak b/tests/fate/h264.mak
index 00b153cc93..7b3e865955 100644
--- a/tests/fate/h264.mak
+++ b/tests/fate/h264.mak
@@ -231,6 +231,7 @@ FATE_H264-$(call DEMMUX, MOV, H264, H264_MP4TOANNEXB_BSF) += fate-h264-bsf-mp4to
                                                              fate-h264-bsf-mp4toannexb-2 \
                                                              fate-h264_mp4toannexb_ticket5927 \
                                                              fate-h264_mp4toannexb_ticket5927_2 \
+                                                             fate-h264-bsf-mp4toannexb-h264_metadata \
 
 FATE_H264-$(call DEMMUX, H264, MOV, DTS2PTS_BSF) += fate-h264-bsf-dts2pts
 
@@ -441,6 +442,8 @@ fate-h264-bsf-mp4toannexb-2:                      CMD = md5 -i $(TARGET_SAMPLES)
 fate-h264-bsf-mp4toannexb-2:                      CMP = oneline
 fate-h264-bsf-mp4toannexb-2:                      REF = cffcfa6a2d0b58c9de1f5785f099f41d
 fate-h264-bsf-mp4toannexb-new-extradata:          CMD = stream_remux mov $(TARGET_SAMPLES)/h264/extradata-reload-multi-stsd.mov "" h264 "-map 0:v"
+fate-h264-bsf-mp4toannexb-h264_metadata:          CMD = transcode mov $(TARGET_SAMPLES)/h264/extradata-reload-multi-stsd.mov \
+                                                        h264 "-c:v copy -bsf:v h264_mp4toannexb,h264_metadata=aud=remove" "-c:v copy"
 fate-h264-bsf-dts2pts:                            CMD = transcode "h264" $(TARGET_SAMPLES)/h264-conformance/CAPAMA3_Sand_F.264 \
                                                         mov "-c:v copy -bsf:v dts2pts -frames:v 50" "-c:v copy"
 fate-h264_mp4toannexb_ticket5927:                 CMD = transcode "mp4" $(TARGET_SAMPLES)/h264/thezerotheorem-cut.mp4 \
diff --git a/tests/ref/fate/h264-bsf-mp4toannexb-h264_metadata b/tests/ref/fate/h264-bsf-mp4toannexb-h264_metadata
new file mode 100644
index 0000000000..d3ba7f1886
--- /dev/null
+++ b/tests/ref/fate/h264-bsf-mp4toannexb-h264_metadata
@@ -0,0 +1,12 @@
+a48f175bf3458410d1dd1907682b92d3 *tests/data/fate/h264-bsf-mp4toannexb-h264_metadata.h264
+4642 tests/data/fate/h264-bsf-mp4toannexb-h264_metadata.h264
+#extradata 0:       38, 0x84d70914
+#tb 0: 1/1200000
+#media_type 0: video
+#codec_id 0: h264
+#dimensions 0: 256x128
+#sar 0: 1/1
+0,     -96000, -9223372036854775808,    48000,     2331, 0xc97509cb
+0,     -48000, -9223372036854775808,    48000,       64, 0x6ad91f4e, F=0x0
+0,          0, -9223372036854775808,    48000,     2203, 0xe376d2a9
+0,      48000, -9223372036854775808,    48000,       44, 0x687a10ea, F=0x0
-- 
2.49.0

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