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>> u8 rcv_seqhdr[MALONE_VC1_RCV_SEQ_HEADER_LEN]; >> >> - if (vpu_vb_is_codecconfig(to_vb2_v4l2_buffer(scode->vb))) > > Please remove vpu_vb_is_codecconfig() entirely, it always returns false, so its > miss-leading. > We have tried to define V4L2_BUF_FLAG_HEADERS_ONLY to to distinguish whether it only contains codec data. https://lore.kernel.org/lkml/20221125020741.28239-1-ming.qian@nxp.com/ Although it was not accepted, we applied this flag in our Android project. Then in the Android platform, vpu_vb_is_codecconfig() doesn't always return false. I know that's not enough reason to keep it. I just want to say that this vpu need to know if the buffer only contains codec header in some cases. And if we remove this, I need to add some comments to remind users that they need to pay attention here. So I tend to keep it. >> - scode->need_data = 0; >> + scode->need_data = 0; >> if (scode->inst->total_input_count) >> return 0; >> - scode->need_data = 0; > > I only remember testing this once quickly on Exynos 4 and I had no clue what > Annex G vs J was and most likley the MFC firmware was detecting it. Checking > quickly, I'm not sure GStreamer actually support both, despite the v4l2 wrapper > pretending. I would expect one to be used in ASF/ISOMP4/AVI, and the other used > in MPEG Transport Stream. GStreamer does not support VC1 in MPEG TS. > > Have you tested this with FFMPEG ? It only maps annex G. > > In general, I don't mind the the change if this is correct userspace behavior. > If ffmpeg and gstreamer don't agree though, we'll have to rethink. GStreamer > code back in the days was design in a way that it should not matter if the > header is split or not. This limitation came with lower latency decoder later, > but none had VC1. > > Please test both userspace, and lets see if this solution is acceptable. ffmpeg > have ffplay and you can seek with your keyboard arrows. > > Nicolas I tested this with gstreaer, not FFMPEG, And I checked the gstreamer code in our repository, Then I found the following related code: } else if (g_str_equal (mimetype, "video/x-wmv")) { const gchar *format = gst_structure_get_string (structure, "format"); if (format) { if (!g_ascii_strcasecmp (format, "WVC1")) fourcc = V4L2_PIX_FMT_VC1_ANNEX_G; else if (!g_ascii_strcasecmp (format, "WMV3")) fourcc = V4L2_PIX_FMT_VC1_ANNEX_L; } Basically it processes WMV3 into VC1_ANNEX_L, and WVC1 to VC1_ANNEX_G. I didn't found them in the upstream gstreamer repository. Now I'm not sure if it is correct userspace behavior. And the reason of this issue is the below code in gstreamer, that the v4l2decoder may only send codec data after seek. codec_data = self->input_state->codec_data; /* We are running in byte-stream mode, so we don't know the headers, but * we need to send something, otherwise the decoder will refuse to * initialize. */ if (codec_data) { gst_buffer_ref (codec_data); } else { codec_data = gst_buffer_ref (frame->input_buffer); processed = TRUE; } Regards, Ming > >> >> ret = vpu_malone_insert_scode_seq(scode, MALONE_CODEC_ID_VC1_SIMPLE, sizeof(rcv_seqhdr)); >> if (ret < 0)