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

[Вадим Бездушный]

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
>>
>>