[FFmpeg-devel] [PATCH] libavformat/movenc: Support encryption of H265 stream in AnnexB format

[Вадим Бездушный]

Ping.

чт, 11 мар. 2021 г. в 10:14, Вадим Бездушный <vadim.bezdush at gmail.com>:

> Ping.
>
> вт, 9 мар. 2021 г. в 00:05, Вадим Бездушный <vadim.bezdush at gmail.com>:
>
>> Ping.
>>
>> This change is quite simple and should be quick to review. Feel free to
>> ask any questions
>>
>> On Mon, 1 Mar 2021, 14:54 Vadym Bezdushnyi, <vadim.bezdush at gmail.com>
>> wrote:
>>
>>> Add an ability to accept H265 AnnexB stream at encryption
>>> similar to how its done for H264 AnnexB stream.
>>>
>>> Steps to test:
>>>
>>> 1. Create h265 test files - mp4 and h265 AnnexB streams:
>>> ffmpeg -f lavfi -i testsrc=duration=10:size=640x480:rate=30 -c:v hevc
>>> input_h265.mp4
>>> ffmpeg -f lavfi -i testsrc=duration=10:size=640x480:rate=30 -c:v hevc
>>> -bsf:v hevc_mp4toannexb input_h265.h265
>>>
>>> 2. Encrypt and decrypt files. Put appropriate input file name here:
>>> input_h265.mp4 or input_h265.h265
>>> ffmpeg -i input_h265.h265 -vcodec copy -acodec copy -encryption_scheme
>>> cenc-aes-ctr \
>>>  -encryption_key 00000000000000000000000000000000 -encryption_kid
>>> 00000000000000000000000000000000 \
>>>  encrypted_h265.mp4
>>> ffplay -i encrypted_h265.mp4  -decryption_key
>>> 00000000000000000000000000000000
>>>
>>> Signed-off-by: Vadym Bezdushnyi <vadim.bezdush at gmail.com>
>>> ---
>>>  libavformat/movenc.c | 16 ++++++++++++++--
>>>  1 file changed, 14 insertions(+), 2 deletions(-)
>>>
>>> diff --git a/libavformat/movenc.c b/libavformat/movenc.c
>>> index 545b0885ae..0433968cd2 100644
>>> --- a/libavformat/movenc.c
>>> +++ b/libavformat/movenc.c
>>> @@ -5685,7 +5685,15 @@ int ff_mov_write_packet(AVFormatContext *s,
>>> AVPacket *pkt)
>>>                  return ret;
>>>              avio_write(pb, reformatted_data, size);
>>>          } else {
>>> -            size = ff_hevc_annexb2mp4(pb, pkt->data, pkt->size, 0,
>>> NULL);
>>> +            if (trk->cenc.aes_ctr) {
>>> +                size = ff_mov_cenc_avc_parse_nal_units(&trk->cenc, pb,
>>> pkt->data, size);
>>> +                if (size < 0) {
>>> +                    ret = size;
>>> +                    goto err;
>>> +                }
>>> +            } else {
>>> +                size = ff_hevc_annexb2mp4(pb, pkt->data, pkt->size, 0,
>>> NULL);
>>> +            }
>>>          }
>>>      } else if (par->codec_id == AV_CODEC_ID_AV1) {
>>>          if (trk->hint_track >= 0 && trk->hint_track < mov->nb_streams) {
>>> @@ -5727,6 +5735,9 @@ int ff_mov_write_packet(AVFormatContext *s,
>>> AVPacket *pkt)
>>>              if (par->codec_id == AV_CODEC_ID_H264 &&
>>> par->extradata_size > 4) {
>>>                  int nal_size_length = (par->extradata[4] & 0x3) + 1;
>>>                  ret = ff_mov_cenc_avc_write_nal_units(s, &trk->cenc,
>>> nal_size_length, pb, pkt->data, size);
>>> +            } else if(par->codec_id == AV_CODEC_ID_HEVC &&
>>> par->extradata_size > 21) {
>>> +                int nal_size_length = (par->extradata[21] & 0x3) + 1;
>>> +                ret = ff_mov_cenc_avc_write_nal_units(s, &trk->cenc,
>>> nal_size_length, pb, pkt->data, size);
>>>              } else {
>>>                  ret = ff_mov_cenc_write_packet(&trk->cenc, pb,
>>> pkt->data, size);
>>>              }
>>> @@ -6711,7 +6722,8 @@ static int mov_init(AVFormatContext *s)
>>>
>>>          if (mov->encryption_scheme == MOV_ENC_CENC_AES_CTR) {
>>>              ret = ff_mov_cenc_init(&track->cenc, mov->encryption_key,
>>> -                track->par->codec_id == AV_CODEC_ID_H264, s->flags &
>>> AVFMT_FLAG_BITEXACT);
>>> +                (track->par->codec_id == AV_CODEC_ID_H264 ||
>>> track->par->codec_id == AV_CODEC_ID_HEVC),
>>> +                s->flags & AVFMT_FLAG_BITEXACT);
>>>              if (ret)
>>>                  return ret;
>>>          }
>>> --
>>> 2.30.0
>>>
>>>