On Mon, Mar 1, 2021 at 1:05 PM Steven Liu <l...@chinaffmpeg.org> wrote: > > > > > 2021年3月1日 下午3:22，Nachiket Tarate <nachiket.program...@gmail.com> 写道： > > > > On Mon, Mar 1, 2021 at 11:30 AM Steven Liu <l...@chinaffmpeg.org> wrote: > >> > >> > >> > >>> 2021年3月1日 下午12:55，Nachiket Tarate <nachiket.program...@gmail.com> 写道： > >>> > >>> This is an updated version of the patch in which I have added the check. > >>> If > >>> the segments are in Fragmented MP4 format, HLS demuxer quits by giving an > >>> error message: > >>> > >>> "SAMPLE-AES encryption is not supported for fragmented MP4 format yet” > >> I don’t think is a good resolution for SAMPLE-AES encryption and > >> decryption. > >> You should support that if you want support SAMPLE-AES in hls, > >> because SAMPLE-AES not only support in MPEG-TS, but also support fragment > >> mp4. > >> Whatever, if you only support mpegts en[de]cryption, it should be a half > >> part patch. > > > > Two completely different technologies/specifications have been used > > for SAMPLE-AES encryption of HLS streams in MPEG-TS and fragmented MP4 > > formats. > > > > Fragmented MP4 media segments are encrypted using the 'cbcs' scheme of > > Common Encryption [CENC]: > > > > https://www.iso.org/standard/68042.html > > > > Encryption of other media segment formats such as MPEG-TS or external > > audio tracks containing H.264, AAC, AC-3 and Enhanced AC-3 media > > streams is described in the Apple's HTTP Live Streaming (HLS) Sample > > Encryption specifications: > > > > https://developer.apple.com/library/ios/documentation/AudioVideo/Conceptual/HLS_Sample_Encryption > > > > This patch implements the later specifications and enables decryption > > of media segments in MPEG-TS, AAC, AC-3 and Enhanced AC-3 formats. So > > I think we should merge this patch right now. > > I think sample ads should support not only mpegts, but also support fmp4 too. > Reference rfc8216 context: > An encryption method of SAMPLE-AES means that the Media Segments > contain media samples, such as audio or video, that are encrypted > using the Advanced Encryption Standard [AES_128]. How these media > streams are encrypted and encapsulated in a segment depends on the > media encoding and the media format of the segment. fMP4 Media > Segments are encrypted using the 'cbcs' scheme of Common > Encryption [COMMON_ENC]. Encryption of other Media Segment > formats containing H.264 [H_264], AAC [ISO_14496], AC-3 [AC_3], > and Enhanced AC-3 [AC_3] media streams is described in the HTTP > Live Streaming (HLS) Sample Encryption specification [SampleEnc]. > The IV attribute MAY be present; see Section 5.2. > > And I saw the m3u8 context, the METHOD is SAMPLE-AES. > > (base) liuqi05:ufbuild liuqi$ head -n10 prog_index.m3u8 > #EXTM3U > #EXT-X-TARGETDURATION:10 > #EXT-X-VERSION:7 > #EXT-X-MEDIA-SEQUENCE:0 > #EXT-X-PLAYLIST-TYPE:VOD > #EXT-X-INDEPENDENT-SEGMENTS > > Focus on this line. > #EXT-X-KEY:METHOD=SAMPLE-AES,URI="http://127.0.0.1/keyOnly.bin",IV=0xcece273e2737a58ca785e257eb080482 > > > #EXT-X-MAP:URI="fileSequence0.mp4" > #EXTINF:8.31667, > #EXT-X-BITRATE:7064 > > > You can point me the part if I misunderstood SAMPLE-AES.
Your understanding of SAMPLE-AES is absolutely correct. I am insisting that let us add support for it in 2 phases as completely 2 different specifications have been used. Phase 1 : Media segments in MPEG-TS, AAC, AC-3 and Enhanced AC-3 formats (Apple's specifications) Phase 2 : Media segments in fragmented MP4 format (CENC specifications) Kindly let me know your opinion. > > > > In future, we will add support for CENC or see how can we use existing > > things from MOV demuxer. > > > > Best Regards, > > Nachiket Tarate > > > >>> > >>> Best Regards, > >>> Nachiket Tarate > >>> > >>> On Mon, Mar 1, 2021 at 10:13 AM Steven Liu <l...@chinaffmpeg.org> wrote: > >>> > >>>> > >>>> > >>>>> 2021年3月1日 下午12:35，Nachiket Tarate <nachiket.program...@gmail.com> 写道： > >>>>> > >>>>> @Steven Liu <l...@chinaffmpeg.org> > >>>>> > >>>>> Can we merge this patch ? > >>>> I’m waiting update patch for fragment mp4 encryption. > >>>> After new version of the patchset I will test and review. > >>>>> > >>>>> Best Regards, > >>>>> Nachiket Tarate > >>>>> > >>>>> On Wed, Feb 24, 2021 at 4:44 PM Nachiket Tarate < > >>>>> nachiket.program...@gmail.com> wrote: > >>>>> > >>>>>> Apple HTTP Live Streaming Sample Encryption: > >>>>>> > >>>>>> > >>>>>> > >>>> https://developer.apple.com/library/ios/documentation/AudioVideo/Conceptual/HLS_Sample_Encryption > >>>>>> > >>>>>> Signed-off-by: Nachiket Tarate <nachiket.program...@gmail.com> > >>>>>> --- > >>>>>> libavformat/Makefile | 2 +- > >>>>>> libavformat/hls.c | 105 ++++++++-- > >>>>>> libavformat/hls_sample_aes.c | 391 +++++++++++++++++++++++++++++++++++ > >>>>>> libavformat/hls_sample_aes.h | 66 ++++++ > >>>>>> libavformat/mpegts.c | 12 ++ > >>>>>> 5 files changed, 562 insertions(+), 14 deletions(-) > >>>>>> create mode 100644 libavformat/hls_sample_aes.c > >>>>>> create mode 100644 libavformat/hls_sample_aes.h > >>>>>> > >>>>>> diff --git a/libavformat/Makefile b/libavformat/Makefile > >>>>>> index fcb39ce133..62627d50a6 100644 > >>>>>> --- a/libavformat/Makefile > >>>>>> +++ b/libavformat/Makefile > >>>>>> @@ -236,7 +236,7 @@ OBJS-$(CONFIG_HCOM_DEMUXER) += hcom.o > >>>>>> pcm.o > >>>>>> OBJS-$(CONFIG_HDS_MUXER) += hdsenc.o > >>>>>> OBJS-$(CONFIG_HEVC_DEMUXER) += hevcdec.o rawdec.o > >>>>>> OBJS-$(CONFIG_HEVC_MUXER) += rawenc.o > >>>>>> -OBJS-$(CONFIG_HLS_DEMUXER) += hls.o > >>>>>> +OBJS-$(CONFIG_HLS_DEMUXER) += hls.o hls_sample_aes.o > >>>>>> OBJS-$(CONFIG_HLS_MUXER) += hlsenc.o hlsplaylist.o > >>>>>> avc.o > >>>>>> OBJS-$(CONFIG_HNM_DEMUXER) += hnm.o > >>>>>> OBJS-$(CONFIG_ICO_DEMUXER) += icodec.o > >>>>>> diff --git a/libavformat/hls.c b/libavformat/hls.c > >>>>>> index af2468ad9b..3cb3853c79 100644 > >>>>>> --- a/libavformat/hls.c > >>>>>> +++ b/libavformat/hls.c > >>>>>> @@ -2,6 +2,7 @@ > >>>>>> * Apple HTTP Live Streaming demuxer > >>>>>> * Copyright (c) 2010 Martin Storsjo > >>>>>> * Copyright (c) 2013 Anssi Hannula > >>>>>> + * Copyright (c) 2021 Nachiket Tarate > >>>>>> * > >>>>>> * This file is part of FFmpeg. > >>>>>> * > >>>>>> @@ -39,6 +40,8 @@ > >>>>>> #include "avio_internal.h" > >>>>>> #include "id3v2.h" > >>>>>> > >>>>>> +#include "hls_sample_aes.h" > >>>>>> + > >>>>>> #define INITIAL_BUFFER_SIZE 32768 > >>>>>> > >>>>>> #define MAX_FIELD_LEN 64 > >>>>>> @@ -145,6 +148,10 @@ struct playlist { > >>>>>> int id3_changed; /* ID3 tag data has changed at some point */ > >>>>>> ID3v2ExtraMeta *id3_deferred_extra; /* stored here until subdemuxer > >>>>>> is opened */ > >>>>>> > >>>>>> + /* Used in case of SAMPLE-AES encryption method */ > >>>>>> + HLSAudioSetupInfo audio_setup_info; > >>>>>> + HLSCryptoContext crypto_ctx; > >>>>>> + > >>>>>> int64_t seek_timestamp; > >>>>>> int seek_flags; > >>>>>> int seek_stream_index; /* into subdemuxer stream array */ > >>>>>> @@ -266,6 +273,8 @@ static void free_playlist_list(HLSContext *c) > >>>>>> pls->ctx->pb = NULL; > >>>>>> avformat_close_input(&pls->ctx); > >>>>>> } > >>>>>> + if (pls->crypto_ctx.aes_ctx) > >>>>>> + av_free(pls->crypto_ctx.aes_ctx); > >>>>>> av_free(pls); > >>>>>> } > >>>>>> av_freep(&c->playlists); > >>>>>> @@ -994,7 +1003,10 @@ fail: > >>>>>> > >>>>>> static struct segment *current_segment(struct playlist *pls) > >>>>>> { > >>>>>> - return pls->segments[pls->cur_seq_no - pls->start_seq_no]; > >>>>>> + int64_t n = pls->cur_seq_no - pls->start_seq_no; > >>>>>> + if (n >= pls->n_segments) > >>>>>> + return NULL; > >>>>>> + return pls->segments[n]; > >>>>>> } > >>>>>> > >>>>>> static struct segment *next_segment(struct playlist *pls) > >>>>>> @@ -1023,10 +1035,11 @@ static int read_from_url(struct playlist *pls, > >>>>>> struct segment *seg, > >>>>>> > >>>>>> /* Parse the raw ID3 data and pass contents to caller */ > >>>>>> static void parse_id3(AVFormatContext *s, AVIOContext *pb, > >>>>>> - AVDictionary **metadata, int64_t *dts, > >>>>>> + AVDictionary **metadata, int64_t *dts, > >>>>>> HLSAudioSetupInfo *audio_setup_info, > >>>>>> ID3v2ExtraMetaAPIC **apic, ID3v2ExtraMeta > >>>>>> **extra_meta) > >>>>>> { > >>>>>> static const char id3_priv_owner_ts[] = > >>>>>> "com.apple.streaming.transportStreamTimestamp"; > >>>>>> + static const char id3_priv_owner_audio_setup[] = > >>>>>> "com.apple.streaming.audioDescription"; > >>>>>> ID3v2ExtraMeta *meta; > >>>>>> > >>>>>> ff_id3v2_read_dict(pb, metadata, ID3v2_DEFAULT_MAGIC, extra_meta); > >>>>>> @@ -1041,6 +1054,8 @@ static void parse_id3(AVFormatContext *s, > >>>>>> AVIOContext *pb, > >>>>>> *dts = ts; > >>>>>> else > >>>>>> av_log(s, AV_LOG_ERROR, "Invalid HLS ID3 audio > >>>>>> timestamp %"PRId64"\n", ts); > >>>>>> + } else if (priv->datasize >= 8 && !strcmp(priv->owner, > >>>>>> id3_priv_owner_audio_setup)) { > >>>>>> + ff_hls_read_audio_setup_info(audio_setup_info, > >>>>>> priv->data, priv->datasize); > >>>>>> } > >>>>>> } else if (!strcmp(meta->tag, "APIC") && apic) > >>>>>> *apic = &meta->data.apic; > >>>>>> @@ -1084,7 +1099,7 @@ static void handle_id3(AVIOContext *pb, struct > >>>>>> playlist *pls) > >>>>>> ID3v2ExtraMeta *extra_meta = NULL; > >>>>>> int64_t timestamp = AV_NOPTS_VALUE; > >>>>>> > >>>>>> - parse_id3(pls->ctx, pb, &metadata, ×tamp, &apic, > >>>>>> &extra_meta); > >>>>>> + parse_id3(pls->ctx, pb, &metadata, ×tamp, > >>>>>> &pls->audio_setup_info, &apic, &extra_meta); > >>>>>> > >>>>>> if (timestamp != AV_NOPTS_VALUE) { > >>>>>> pls->id3_mpegts_timestamp = timestamp; > >>>>>> @@ -1238,10 +1253,7 @@ static int open_input(HLSContext *c, struct > >>>>>> playlist *pls, struct segment *seg, > >>>>>> av_log(pls->parent, AV_LOG_VERBOSE, "HLS request for url '%s', > >>>> offset > >>>>>> %"PRId64", playlist %d\n", > >>>>>> seg->url, seg->url_offset, pls->index); > >>>>>> > >>>>>> - if (seg->key_type == KEY_NONE) { > >>>>>> - ret = open_url(pls->parent, in, seg->url, &c->avio_opts, opts, > >>>>>> &is_http); > >>>>>> - } else if (seg->key_type == KEY_AES_128) { > >>>>>> - char iv[33], key[33], url[MAX_URL_SIZE]; > >>>>>> + if (seg->key_type == KEY_AES_128 || seg->key_type == > >>>> KEY_SAMPLE_AES) { > >>>>>> if (strcmp(seg->key, pls->key_url)) { > >>>>>> AVIOContext *pb = NULL; > >>>>>> if (open_url(pls->parent, &pb, seg->key, &c->avio_opts, > >>>> opts, > >>>>>> NULL) == 0) { > >>>>>> @@ -1257,6 +1269,10 @@ static int open_input(HLSContext *c, struct > >>>>>> playlist *pls, struct segment *seg, > >>>>>> } > >>>>>> av_strlcpy(pls->key_url, seg->key, sizeof(pls->key_url)); > >>>>>> } > >>>>>> + } > >>>>>> + > >>>>>> + if (seg->key_type == KEY_AES_128) { > >>>>>> + char iv[33], key[33], url[MAX_URL_SIZE]; > >>>>>> ff_data_to_hex(iv, seg->iv, sizeof(seg->iv), 0); > >>>>>> ff_data_to_hex(key, pls->key, sizeof(pls->key), 0); > >>>>>> iv[32] = key[32] = '\0'; > >>>>>> @@ -1273,13 +1289,9 @@ static int open_input(HLSContext *c, struct > >>>>>> playlist *pls, struct segment *seg, > >>>>>> goto cleanup; > >>>>>> } > >>>>>> ret = 0; > >>>>>> - } else if (seg->key_type == KEY_SAMPLE_AES) { > >>>>>> - av_log(pls->parent, AV_LOG_ERROR, > >>>>>> - "SAMPLE-AES encryption is not supported yet\n"); > >>>>>> - ret = AVERROR_PATCHWELCOME; > >>>>>> + } else { > >>>>>> + ret = open_url(pls->parent, in, seg->url, &c->avio_opts, opts, > >>>>>> &is_http); > >>>>>> } > >>>>>> - else > >>>>>> - ret = AVERROR(ENOSYS); > >>>>>> > >>>>>> /* Seek to the requested position. If this was a HTTP request, the > >>>>>> offset > >>>>>> * should already be where want it to, but this allows e.g. local > >>>>>> testing > >>>>>> @@ -1948,6 +1960,7 @@ static int hls_read_header(AVFormatContext *s) > >>>>>> struct playlist *pls = c->playlists[i]; > >>>>>> char *url; > >>>>>> ff_const59 AVInputFormat *in_fmt = NULL; > >>>>>> + struct segment *seg = NULL; > >>>>>> > >>>>>> if (!(pls->ctx = avformat_alloc_context())) { > >>>>>> ret = AVERROR(ENOMEM); > >>>>>> @@ -1980,8 +1993,41 @@ static int hls_read_header(AVFormatContext *s) > >>>>>> pls->ctx = NULL; > >>>>>> goto fail; > >>>>>> } > >>>>>> + > >>>>>> ffio_init_context(&pls->pb, pls->read_buffer, > >>>>>> INITIAL_BUFFER_SIZE, 0, pls, > >>>>>> read_data, NULL, NULL); > >>>>>> + > >>>>>> + /* > >>>>>> + * If encryption scheme is SAMPLE-AES, try to read ID3 tags > >>>>>> of > >>>>>> + * external audio track that contains audio setup information > >>>>>> + */ > >>>>>> + seg = current_segment(pls); > >>>>>> + if (seg && seg->key_type == KEY_SAMPLE_AES && > >>>> pls->n_renditions > > >>>>>> 0 && > >>>>>> + pls->renditions[0]->type == AVMEDIA_TYPE_AUDIO) { > >>>>>> + uint8_t buf[HLS_MAX_ID3_TAGS_DATA_LEN]; > >>>>>> + if ((ret = avio_read(&pls->pb, buf, > >>>>>> HLS_MAX_ID3_TAGS_DATA_LEN)) < 0) { > >>>>>> + /* Fail if error was not end of file */ > >>>>>> + if (ret != AVERROR_EOF) { > >>>>>> + avformat_free_context(pls->ctx); > >>>>>> + pls->ctx = NULL; > >>>>>> + goto fail; > >>>>>> + } > >>>>>> + } > >>>>>> + ret = 0; > >>>>>> + } > >>>>>> + > >>>>>> + /* > >>>>>> + * If encryption scheme is SAMPLE-AES and audio setup > >>>> information > >>>>>> is present in external audio track, > >>>>>> + * use that information to find the media format, otherwise > >>>> probe > >>>>>> input data > >>>>>> + */ > >>>>>> + if (seg && seg->key_type == KEY_SAMPLE_AES && > >>>>>> pls->is_id3_timestamped && > >>>>>> + pls->audio_setup_info.codec_id != AV_CODEC_ID_NONE) { > >>>>>> + void *iter = NULL; > >>>>>> + while ((in_fmt = (ff_const59 AVInputFormat > >>>>>> *)av_demuxer_iterate(&iter))) > >>>>>> + if (in_fmt->raw_codec_id == > >>>>>> pls->audio_setup_info.codec_id) { > >>>>>> + break; > >>>>>> + } > >>>>>> + } else { > >>>>>> pls->ctx->probesize = s->probesize > 0 ? s->probesize : 1024 * > >>>> 4; > >>>>>> pls->ctx->max_analyze_duration = s->max_analyze_duration > 0 ? > >>>>>> s->max_analyze_duration : 4 * AV_TIME_BASE; > >>>>>> pls->ctx->interrupt_callback = s->interrupt_callback; > >>>>>> @@ -1999,6 +2045,25 @@ static int hls_read_header(AVFormatContext *s) > >>>>>> goto fail; > >>>>>> } > >>>>>> av_free(url); > >>>>>> + } > >>>>>> + > >>>>>> + if (seg && seg->key_type == KEY_SAMPLE_AES) { > >>>>>> + if (!pls->is_id3_timestamped && pls->n_renditions > 0 && > >>>>>> pls->renditions[0]->type != AVMEDIA_TYPE_AUDIO && > >>>>>> + strcmp(in_fmt->name, "mpegts")) { > >>>>>> + av_log(s, AV_LOG_ERROR, "SAMPLE-AES encryption is not > >>>>>> supported for fragmented MP4 format yet\n"); > >>>>>> + ret = AVERROR_PATCHWELCOME; > >>>>>> + } else { > >>>>>> + pls->crypto_ctx.aes_ctx = av_aes_alloc(); > >>>>>> + if (!pls->crypto_ctx.aes_ctx) > >>>>>> + ret = AVERROR(ENOMEM); > >>>>>> + } > >>>>>> + if (ret != 0) { > >>>>>> + avformat_free_context(pls->ctx); > >>>>>> + pls->ctx = NULL; > >>>>>> + goto fail; > >>>>>> + } > >>>>>> + } > >>>>>> + > >>>>>> pls->ctx->pb = &pls->pb; > >>>>>> pls->ctx->io_open = nested_io_open; > >>>>>> pls->ctx->flags |= s->flags & ~AVFMT_FLAG_CUSTOM_IO; > >>>>>> @@ -2027,7 +2092,12 @@ static int hls_read_header(AVFormatContext *s) > >>>>>> * on us if they want to. > >>>>>> */ > >>>>>> if (pls->is_id3_timestamped || (pls->n_renditions > 0 && > >>>>>> pls->renditions[0]->type == AVMEDIA_TYPE_AUDIO)) { > >>>>>> + if (seg && seg->key_type == KEY_SAMPLE_AES && > >>>>>> pls->audio_setup_info.setup_data_length > 0 && > >>>>>> + pls->ctx->nb_streams == 1) > >>>>>> + ret = > >>>> ff_hls_parse_audio_setup_info(pls->ctx->streams[0], > >>>>>> &pls->audio_setup_info); > >>>>>> + else > >>>>>> ret = avformat_find_stream_info(pls->ctx, NULL); > >>>>>> + > >>>>>> if (ret < 0) > >>>>>> goto fail; > >>>>>> } > >>>>>> @@ -2157,6 +2227,7 @@ static int hls_read_packet(AVFormatContext *s, > >>>>>> AVPacket *pkt) > >>>>>> while (1) { > >>>>>> int64_t ts_diff; > >>>>>> AVRational tb; > >>>>>> + struct segment *seg = NULL; > >>>>>> ret = av_read_frame(pls->ctx, &pls->pkt); > >>>>>> if (ret < 0) { > >>>>>> if (!avio_feof(&pls->pb) && ret != AVERROR_EOF) > >>>>>> @@ -2175,6 +2246,14 @@ static int hls_read_packet(AVFormatContext *s, > >>>>>> AVPacket *pkt) > >>>>>> get_timebase(pls), AV_TIME_BASE_Q); > >>>>>> } > >>>>>> > >>>>>> + seg = current_segment(pls); > >>>>>> + if (seg && seg->key_type == KEY_SAMPLE_AES) { > >>>>>> + enum AVCodecID codec_id = > >>>>>> pls->ctx->streams[pls->pkt.stream_index]->codecpar->codec_id; > >>>>>> + memcpy(pls->crypto_ctx.iv, seg->iv, > >>>> sizeof(seg->iv)); > >>>>>> + memcpy(pls->crypto_ctx.key, pls->key, > >>>>>> sizeof(pls->key)); > >>>>>> + ff_hls_decrypt_frame(codec_id, &pls->crypto_ctx, > >>>>>> &pls->pkt); > >>>>>> + } > >>>>>> + > >>>>>> if (pls->seek_timestamp == AV_NOPTS_VALUE) > >>>>>> break; > >>>>>> > >>>>>> diff --git a/libavformat/hls_sample_aes.c > >>>>>> b/libavformat/hls_sample_aes.c > >>>>>> new file mode 100644 > >>>>>> index 0000000000..0407a15b0f > >>>>>> --- /dev/null > >>>>>> +++ b/libavformat/hls_sample_aes.c > >>>>>> @@ -0,0 +1,391 @@ > >>>>>> +/* > >>>>>> + * Apple HTTP Live Streaming Sample Encryption/Decryption > >>>>>> + * > >>>>>> + * Copyright (c) 2021 Nachiket Tarate > >>>>>> + * > >>>>>> + * This file is part of FFmpeg. > >>>>>> + * > >>>>>> + * FFmpeg is free software; you can redistribute it and/or > >>>>>> + * modify it under the terms of the GNU Lesser General Public > >>>>>> + * License as published by the Free Software Foundation; either > >>>>>> + * version 2.1 of the License, or (at your option) any later version. > >>>>>> + * > >>>>>> + * FFmpeg is distributed in the hope that it will be useful, > >>>>>> + * but WITHOUT ANY WARRANTY; without even the implied warranty of > >>>>>> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU > >>>>>> + * Lesser General Public License for more details. > >>>>>> + * > >>>>>> + * You should have received a copy of the GNU Lesser General Public > >>>>>> + * License along with FFmpeg; if not, write to the Free Software > >>>>>> + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA > >>>>>> 02110-1301 USA > >>>>>> + */ > >>>>>> + > >>>>>> +/** > >>>>>> + * @file > >>>>>> + * Apple HTTP Live Streaming Sample Encryption > >>>>>> + * > >>>>>> > >>>> https://developer.apple.com/library/ios/documentation/AudioVideo/Conceptual/HLS_Sample_Encryption > >>>>>> + */ > >>>>>> + > >>>>>> +#include "hls_sample_aes.h" > >>>>>> + > >>>>>> +#include "libavcodec/adts_header.h" > >>>>>> +#include "libavcodec/adts_parser.h" > >>>>>> +#include "libavcodec/ac3_parser_internal.h" > >>>>>> + > >>>>>> + > >>>>>> +typedef struct NALUnit { > >>>>>> + uint8_t *data; > >>>>>> + int type; > >>>>>> + int length; > >>>>>> + int start_code_length; > >>>>>> +} NALUnit; > >>>>>> + > >>>>>> +typedef struct AudioFrame { > >>>>>> + uint8_t *data; > >>>>>> + int length; > >>>>>> + int header_length; > >>>>>> +} AudioFrame; > >>>>>> + > >>>>>> +typedef struct CodecParserContext { > >>>>>> + const uint8_t *buf_ptr; > >>>>>> + const uint8_t *buf_end; > >>>>>> +} CodecParserContext; > >>>>>> + > >>>>>> +static const int eac3_sample_rate_tab[] = { 48000, 44100, 32000, 0 }; > >>>>>> + > >>>>>> +void ff_hls_read_audio_setup_info(HLSAudioSetupInfo *info, const > >>>> uint8_t > >>>>>> *buf, size_t size) > >>>>>> +{ > >>>>>> + if (size < 8) > >>>>>> + return; > >>>>>> + > >>>>>> + info->codec_tag = AV_RL32(buf); > >>>>>> + > >>>>>> + if (info->codec_tag == MKTAG('z','a', 'a', 'c')) > >>>>>> + info->codec_id = AV_CODEC_ID_AAC; > >>>>>> + else if (info->codec_tag == MKTAG('z','a', 'c', '3')) > >>>>>> + info->codec_id = AV_CODEC_ID_AC3; > >>>>>> + else if (info->codec_tag == MKTAG('z','e', 'c', '3')) > >>>>>> + info->codec_id = AV_CODEC_ID_EAC3; > >>>>>> + else > >>>>>> + info->codec_id = AV_CODEC_ID_NONE; > >>>>>> + > >>>>>> + buf += 4; > >>>>>> + info->priming = AV_RL16(buf); > >>>>>> + buf += 2; > >>>>>> + info->version = *buf++; > >>>>>> + info->setup_data_length = *buf++; > >>>>>> + > >>>>>> + if (info->setup_data_length > size - 8) > >>>>>> + info->setup_data_length = size - 8; > >>>>>> + > >>>>>> + if (info->setup_data_length > HLS_MAX_AUDIO_SETUP_DATA_LEN) > >>>>>> + return; > >>>>>> + > >>>>>> + memcpy(info->setup_data, buf, info->setup_data_length); > >>>>>> +} > >>>>>> + > >>>>>> +int ff_hls_parse_audio_setup_info(AVStream *st, HLSAudioSetupInfo > >>>> *info) > >>>>>> +{ > >>>>>> + int ret = 0; > >>>>>> + > >>>>>> + st->codecpar->codec_tag = info->codec_tag; > >>>>>> + > >>>>>> + if (st->codecpar->codec_id == AV_CODEC_ID_AAC) > >>>>>> + return 0; > >>>>>> + > >>>>>> + if (st->codecpar->codec_id != AV_CODEC_ID_AC3 && > >>>>>> st->codecpar->codec_id != AV_CODEC_ID_EAC3) > >>>>>> + return AVERROR_INVALIDDATA; > >>>>>> + > >>>>>> + if (st->codecpar->codec_id == AV_CODEC_ID_AC3) { > >>>>>> + > >>>>>> + AC3HeaderInfo *ac3hdr = NULL; > >>>>>> + > >>>>>> + ret = avpriv_ac3_parse_header(&ac3hdr, info->setup_data, > >>>>>> info->setup_data_length); > >>>>>> + if (ret < 0) { > >>>>>> + if (ret != AVERROR(ENOMEM)) > >>>>>> + av_free(ac3hdr); > >>>>>> + return ret; > >>>>>> + } > >>>>>> + > >>>>>> + st->codecpar->sample_rate = ac3hdr->sample_rate; > >>>>>> + st->codecpar->channels = ac3hdr->channels; > >>>>>> + st->codecpar->channel_layout = ac3hdr->channel_layout; > >>>>>> + st->codecpar->bit_rate = ac3hdr->bit_rate; > >>>>>> + > >>>>>> + av_free(ac3hdr); > >>>>>> + } else { /* Parse 'dec3' EC3SpecificBox */ > >>>>>> + > >>>>>> + GetBitContext gb; > >>>>>> + int data_rate, fscod, acmod, lfeon; > >>>>>> + > >>>>>> + ret = init_get_bits8(&gb, info->setup_data, > >>>>>> info->setup_data_length); > >>>>>> + if (ret < 0) > >>>>>> + return AVERROR_INVALIDDATA; > >>>>>> + > >>>>>> + data_rate = get_bits(&gb, 13); > >>>>>> + skip_bits(&gb, 3); > >>>>>> + fscod = get_bits(&gb, 2); > >>>>>> + skip_bits(&gb, 10); > >>>>>> + acmod = get_bits(&gb, 3); > >>>>>> + lfeon = get_bits(&gb, 1); > >>>>>> + > >>>>>> + st->codecpar->sample_rate = eac3_sample_rate_tab[fscod]; > >>>>>> + > >>>>>> + st->codecpar->channel_layout = > >>>>>> avpriv_ac3_channel_layout_tab[acmod]; > >>>>>> + if (lfeon) > >>>>>> + st->codecpar->channel_layout |= AV_CH_LOW_FREQUENCY; > >>>>>> + > >>>>>> + st->codecpar->channels = > >>>>>> av_get_channel_layout_nb_channels(st->codecpar->channel_layout); > >>>>>> + > >>>>>> + st->codecpar->bit_rate = data_rate*1000; > >>>>>> + } > >>>>>> + > >>>>>> + return 0; > >>>>>> +} > >>>>>> + > >>>>>> +/* > >>>>>> + * Remove start code emulation prevention 0x03 bytes > >>>>>> + */ > >>>>>> +static void remove_scep_3_bytes(NALUnit *nalu) > >>>>>> +{ > >>>>>> + int i = 0; > >>>>>> + int j = 0; > >>>>>> + > >>>>>> + uint8_t *data = nalu->data; > >>>>>> + > >>>>>> + while (i < nalu->length) { > >>>>>> + if (nalu->length - i > 3 && AV_RB24(&data[i]) == 0x000003) { > >>>>>> + data[j++] = data[i++]; > >>>>>> + data[j++] = data[i++]; > >>>>>> + i++; > >>>>>> + } else { > >>>>>> + data[j++] = data[i++]; > >>>>>> + } > >>>>>> + } > >>>>>> + > >>>>>> + nalu->length = j; > >>>>>> +} > >>>>>> + > >>>>>> +static int get_next_nal_unit(CodecParserContext *ctx, NALUnit *nalu) > >>>>>> +{ > >>>>>> + const uint8_t *nalu_start = ctx->buf_ptr; > >>>>>> + > >>>>>> + if (ctx->buf_end - ctx->buf_ptr >= 4 && AV_RB32(ctx->buf_ptr) == > >>>>>> 0x00000001) > >>>>>> + nalu->start_code_length = 4; > >>>>>> + else if (ctx->buf_end - ctx->buf_ptr >= 3 && AV_RB24(ctx->buf_ptr) > >>>> == > >>>>>> 0x000001) > >>>>>> + nalu->start_code_length = 3; > >>>>>> + else /* No start code at the beginning of the NAL unit */ > >>>>>> + return -1; > >>>>>> + > >>>>>> + ctx->buf_ptr += nalu->start_code_length; > >>>>>> + > >>>>>> + while (ctx->buf_ptr < ctx->buf_end) { > >>>>>> + if (ctx->buf_end - ctx->buf_ptr >= 4 && AV_RB32(ctx->buf_ptr) > >>>> == > >>>>>> 0x00000001) > >>>>>> + break; > >>>>>> + else if (ctx->buf_end - ctx->buf_ptr >= 3 && > >>>>>> AV_RB24(ctx->buf_ptr) == 0x000001) > >>>>>> + break; > >>>>>> + ctx->buf_ptr++; > >>>>>> + } > >>>>>> + > >>>>>> + nalu->data = (uint8_t *)nalu_start + nalu->start_code_length; > >>>>>> + nalu->length = ctx->buf_ptr - nalu->data; > >>>>>> + nalu->type = *nalu->data & 0x1F; > >>>>>> + > >>>>>> + return 0; > >>>>>> +} > >>>>>> + > >>>>>> +static int decrypt_nal_unit(HLSCryptoContext *crypto_ctx, NALUnit > >>>> *nalu) > >>>>>> +{ > >>>>>> + int ret = 0; > >>>>>> + int rem_bytes; > >>>>>> + uint8_t *data; > >>>>>> + uint8_t iv[16]; > >>>>>> + > >>>>>> + ret = av_aes_init(crypto_ctx->aes_ctx, crypto_ctx->key, 16 * 8, > >>>>>> 1); > >>>>>> + if (ret < 0) > >>>>>> + return ret; > >>>>>> + > >>>>>> + /* Remove start code emulation prevention 0x03 bytes */ > >>>>>> + remove_scep_3_bytes(nalu); > >>>>>> + > >>>>>> + data = nalu->data + 32; > >>>>>> + rem_bytes = nalu->length - 32; > >>>>>> + > >>>>>> + memcpy(iv, crypto_ctx->iv, 16); > >>>>>> + > >>>>>> + while (rem_bytes > 0) { > >>>>>> + if (rem_bytes > 16) { > >>>>>> + av_aes_crypt(crypto_ctx->aes_ctx, data, data, 1, iv, 1); > >>>>>> + data += 16; > >>>>>> + rem_bytes -= 16; > >>>>>> + } > >>>>>> + data += FFMIN(144, rem_bytes); > >>>>>> + rem_bytes -= FFMIN(144, rem_bytes); > >>>>>> + } > >>>>>> + > >>>>>> + return 0; > >>>>>> +} > >>>>>> + > >>>>>> +static int decrypt_video_frame(HLSCryptoContext *crypto_ctx, AVPacket > >>>>>> *pkt) > >>>>>> +{ > >>>>>> + int ret = 0; > >>>>>> + CodecParserContext ctx; > >>>>>> + NALUnit nalu; > >>>>>> + uint8_t *data_ptr; > >>>>>> + int move_nalu = 0; > >>>>>> + > >>>>>> + memset(&ctx, 0, sizeof(ctx)); > >>>>>> + ctx.buf_ptr = pkt->data; > >>>>>> + ctx.buf_end = pkt->data + pkt->size; > >>>>>> + > >>>>>> + data_ptr = pkt->data; > >>>>>> + > >>>>>> + while (ctx.buf_ptr < ctx.buf_end) { > >>>>>> + memset(&nalu, 0, sizeof(nalu)); > >>>>>> + ret = get_next_nal_unit(&ctx, &nalu); > >>>>>> + if (ret < 0) > >>>>>> + return ret; > >>>>>> + if ((nalu.type == 0x01 || nalu.type == 0x05) && nalu.length > > >>>> 48) > >>>>>> { > >>>>>> + int encrypted_nalu_length = nalu.length; > >>>>>> + ret = decrypt_nal_unit(crypto_ctx, &nalu); > >>>>>> + if (ret < 0) > >>>>>> + return ret; > >>>>>> + move_nalu = nalu.length != encrypted_nalu_length; > >>>>>> + } > >>>>>> + if (move_nalu) > >>>>>> + memmove(data_ptr, nalu.data - nalu.start_code_length, > >>>>>> nalu.start_code_length + nalu.length); > >>>>>> + data_ptr += nalu.start_code_length + nalu.length; > >>>>>> + } > >>>>>> + > >>>>>> + av_shrink_packet(pkt, data_ptr - pkt->data); > >>>>>> + > >>>>>> + return 0; > >>>>>> +} > >>>>>> + > >>>>>> +static int get_next_adts_frame(CodecParserContext *ctx, AudioFrame > >>>> *frame) > >>>>>> +{ > >>>>>> + int ret = 0; > >>>>>> + > >>>>>> + AACADTSHeaderInfo *adts_hdr = NULL; > >>>>>> + > >>>>>> + /* Find next sync word 0xFFF */ > >>>>>> + while (ctx->buf_ptr < ctx->buf_end - 1) { > >>>>>> + if (*ctx->buf_ptr == 0xFF && *(ctx->buf_ptr + 1) & 0xF0 == > >>>> 0xF0) > >>>>>> + break; > >>>>>> + ctx->buf_ptr++; > >>>>>> + } > >>>>>> + > >>>>>> + if (ctx->buf_ptr >= ctx->buf_end - 1) > >>>>>> + return -1; > >>>>>> + > >>>>>> + frame->data = (uint8_t*)ctx->buf_ptr; > >>>>>> + > >>>>>> + ret = avpriv_adts_header_parse (&adts_hdr, frame->data, > >>>> ctx->buf_end > >>>>>> - frame->data); > >>>>>> + if (ret < 0) > >>>>>> + return ret; > >>>>>> + > >>>>>> + frame->header_length = adts_hdr->crc_absent ? > >>>> AV_AAC_ADTS_HEADER_SIZE > >>>>>> : AV_AAC_ADTS_HEADER_SIZE + 2; > >>>>>> + frame->length = adts_hdr->frame_length; > >>>>>> + > >>>>>> + av_free(adts_hdr); > >>>>>> + > >>>>>> + return 0; > >>>>>> +} > >>>>>> + > >>>>>> +static int get_next_ac3_eac3_sync_frame(CodecParserContext *ctx, > >>>>>> AudioFrame *frame) > >>>>>> +{ > >>>>>> + int ret = 0; > >>>>>> + > >>>>>> + AC3HeaderInfo *hdr = NULL; > >>>>>> + > >>>>>> + /* Find next sync word 0x0B77 */ > >>>>>> + while (ctx->buf_ptr < ctx->buf_end - 1) { > >>>>>> + if (*ctx->buf_ptr == 0x0B && *(ctx->buf_ptr + 1) == 0x77) > >>>>>> + break; > >>>>>> + ctx->buf_ptr++; > >>>>>> + } > >>>>>> + > >>>>>> + if (ctx->buf_ptr >= ctx->buf_end - 1) > >>>>>> + return -1; > >>>>>> + > >>>>>> + frame->data = (uint8_t*)ctx->buf_ptr; > >>>>>> + frame->header_length = 0; > >>>>>> + > >>>>>> + ret = avpriv_ac3_parse_header(&hdr, frame->data, ctx->buf_end - > >>>>>> frame->data); > >>>>>> + if (ret < 0) { > >>>>>> + if (ret != AVERROR(ENOMEM)) > >>>>>> + av_free(hdr); > >>>>>> + return ret; > >>>>>> + } > >>>>>> + > >>>>>> + frame->length = hdr->frame_size; > >>>>>> + > >>>>>> + av_free(hdr); > >>>>>> + > >>>>>> + return 0; > >>>>>> +} > >>>>>> + > >>>>>> +static int get_next_sync_frame(enum AVCodecID codec_id, > >>>>>> CodecParserContext *ctx, AudioFrame *frame) > >>>>>> +{ > >>>>>> + if (codec_id == AV_CODEC_ID_AAC) > >>>>>> + return get_next_adts_frame(ctx, frame); > >>>>>> + else if (codec_id == AV_CODEC_ID_AC3 || codec_id == > >>>> AV_CODEC_ID_EAC3) > >>>>>> + return get_next_ac3_eac3_sync_frame(ctx, frame); > >>>>>> + else > >>>>>> + return AVERROR_INVALIDDATA; > >>>>>> +} > >>>>>> + > >>>>>> +static int decrypt_sync_frame(enum AVCodecID codec_id, > >>>>>> HLSCryptoContext > >>>>>> *crypto_ctx, AudioFrame *frame) > >>>>>> +{ > >>>>>> + int ret = 0; > >>>>>> + uint8_t *data; > >>>>>> + int num_of_encrypted_blocks; > >>>>>> + > >>>>>> + ret = av_aes_init(crypto_ctx->aes_ctx, crypto_ctx->key, 16 * 8, > >>>>>> 1); > >>>>>> + if (ret < 0) > >>>>>> + return ret; > >>>>>> + > >>>>>> + data = frame->data + frame->header_length + 16; > >>>>>> + > >>>>>> + num_of_encrypted_blocks = (frame->length - frame->header_length - > >>>>>> 16)/16; > >>>>>> + > >>>>>> + av_aes_crypt(crypto_ctx->aes_ctx, data, data, > >>>>>> num_of_encrypted_blocks, crypto_ctx->iv, 1); > >>>>>> + > >>>>>> + return 0; > >>>>>> +} > >>>>>> + > >>>>>> +static int decrypt_audio_frame(enum AVCodecID codec_id, > >>>> HLSCryptoContext > >>>>>> *crypto_ctx, AVPacket *pkt) > >>>>>> +{ > >>>>>> + int ret = 0; > >>>>>> + CodecParserContext ctx; > >>>>>> + AudioFrame frame; > >>>>>> + > >>>>>> + memset(&ctx, 0, sizeof(ctx)); > >>>>>> + ctx.buf_ptr = pkt->data; > >>>>>> + ctx.buf_end = pkt->data + pkt->size; > >>>>>> + > >>>>>> + while (ctx.buf_ptr < ctx.buf_end) { > >>>>>> + memset(&frame, 0, sizeof(frame)); > >>>>>> + ret = get_next_sync_frame(codec_id, &ctx, &frame); > >>>>>> + if (ret < 0) > >>>>>> + return ret; > >>>>>> + if (frame.length - frame.header_length > 31) { > >>>>>> + ret = decrypt_sync_frame(codec_id, crypto_ctx, &frame); > >>>>>> + if (ret < 0) > >>>>>> + return ret; > >>>>>> + } > >>>>>> + ctx.buf_ptr += frame.length; > >>>>>> + } > >>>>>> + > >>>>>> + return 0; > >>>>>> +} > >>>>>> + > >>>>>> +int ff_hls_decrypt_frame(enum AVCodecID codec_id, HLSCryptoContext > >>>>>> *crypto_ctx, AVPacket *pkt) > >>>>>> +{ > >>>>>> + if (codec_id == AV_CODEC_ID_H264) > >>>>>> + return decrypt_video_frame(crypto_ctx, pkt); > >>>>>> + else if (codec_id == AV_CODEC_ID_AAC || codec_id == > >>>>>> AV_CODEC_ID_AC3 > >>>>>> || codec_id == AV_CODEC_ID_EAC3) > >>>>>> + return decrypt_audio_frame(codec_id, crypto_ctx, pkt); > >>>>>> + > >>>>>> + return AVERROR_INVALIDDATA; > >>>>>> +} > >>>>>> diff --git a/libavformat/hls_sample_aes.h > >>>>>> b/libavformat/hls_sample_aes.h > >>>>>> new file mode 100644 > >>>>>> index 0000000000..cf80e41cb0 > >>>>>> --- /dev/null > >>>>>> +++ b/libavformat/hls_sample_aes.h > >>>>>> @@ -0,0 +1,66 @@ > >>>>>> +/* > >>>>>> + * Apple HTTP Live Streaming Sample Encryption/Decryption > >>>>>> + * > >>>>>> + * Copyright (c) 2021 Nachiket Tarate > >>>>>> + * > >>>>>> + * This file is part of FFmpeg. > >>>>>> + * > >>>>>> + * FFmpeg is free software; you can redistribute it and/or > >>>>>> + * modify it under the terms of the GNU Lesser General Public > >>>>>> + * License as published by the Free Software Foundation; either > >>>>>> + * version 2.1 of the License, or (at your option) any later version. > >>>>>> + * > >>>>>> + * FFmpeg is distributed in the hope that it will be useful, > >>>>>> + * but WITHOUT ANY WARRANTY; without even the implied warranty of > >>>>>> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU > >>>>>> + * Lesser General Public License for more details. > >>>>>> + * > >>>>>> + * You should have received a copy of the GNU Lesser General Public > >>>>>> + * License along with FFmpeg; if not, write to the Free Software > >>>>>> + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA > >>>>>> 02110-1301 USA > >>>>>> + */ > >>>>>> + > >>>>>> +/** > >>>>>> + * @file > >>>>>> + * Apple HTTP Live Streaming Sample Encryption > >>>>>> + * > >>>>>> > >>>> https://developer.apple.com/library/ios/documentation/AudioVideo/Conceptual/HLS_Sample_Encryption > >>>>>> + */ > >>>>>> + > >>>>>> +#ifndef AVFORMAT_HLS_SAMPLE_AES_H > >>>>>> +#define AVFORMAT_HLS_SAMPLE_AES_H > >>>>>> + > >>>>>> +#include <stdint.h> > >>>>>> + > >>>>>> +#include "avformat.h" > >>>>>> + > >>>>>> +#include "libavcodec/avcodec.h" > >>>>>> +#include "libavutil/aes.h" > >>>>>> + > >>>>>> +#define HLS_MAX_ID3_TAGS_DATA_LEN 138 > >>>>>> +#define HLS_MAX_AUDIO_SETUP_DATA_LEN 10 > >>>>>> + > >>>>>> + > >>>>>> +typedef struct HLSCryptoContext { > >>>>>> + struct AVAES *aes_ctx; > >>>>>> + uint8_t key[16]; > >>>>>> + uint8_t iv[16]; > >>>>>> +} HLSCryptoContext; > >>>>>> + > >>>>>> +typedef struct HLSAudioSetupInfo { > >>>>>> + enum AVCodecID codec_id; > >>>>>> + uint32_t codec_tag; > >>>>>> + uint16_t priming; > >>>>>> + uint8_t version; > >>>>>> + uint8_t setup_data_length; > >>>>>> + uint8_t setup_data[HLS_MAX_AUDIO_SETUP_DATA_LEN]; > >>>>>> +} HLSAudioSetupInfo; > >>>>>> + > >>>>>> + > >>>>>> +void ff_hls_read_audio_setup_info(HLSAudioSetupInfo *info, const > >>>> uint8_t > >>>>>> *buf, size_t size); > >>>>>> + > >>>>>> +int ff_hls_parse_audio_setup_info(AVStream *st, HLSAudioSetupInfo > >>>> *info); > >>>>>> + > >>>>>> +int ff_hls_decrypt_frame(enum AVCodecID codec_id, HLSCryptoContext > >>>>>> *crypto_ctx, AVPacket *pkt); > >>>>>> + > >>>>>> +#endif /* AVFORMAT_HLS_SAMPLE_AES_H */ > >>>>>> + > >>>>>> diff --git a/libavformat/mpegts.c b/libavformat/mpegts.c > >>>>>> index e283ec09d7..dc611ae788 100644 > >>>>>> --- a/libavformat/mpegts.c > >>>>>> +++ b/libavformat/mpegts.c > >>>>>> @@ -839,6 +839,16 @@ static const StreamType MISC_types[] = { > >>>>>> { 0 }, > >>>>>> }; > >>>>>> > >>>>>> +/* HLS Sample Encryption Types */ > >>>>>> +static const StreamType HLS_SAMPLE_ENC_types[] = { > >>>>>> + { 0xdb, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_H264}, > >>>>>> + { 0xcf, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AAC }, > >>>>>> + { 0xc1, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 }, > >>>>>> + { 0xc2, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3}, > >>>>>> + { 0 }, > >>>>>> +}; > >>>>>> + > >>>>>> + > >>>>>> static const StreamType REGD_types[] = { > >>>>>> { MKTAG('d', 'r', 'a', 'c'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_DIRAC > >>>> }, > >>>>>> { MKTAG('A', 'C', '-', '3'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 > >>>> }, > >>>>>> @@ -948,6 +958,8 @@ static int mpegts_set_stream_info(AVStream *st, > >>>>>> PESContext *pes, > >>>>>> } > >>>>>> if (st->codecpar->codec_id == AV_CODEC_ID_NONE) > >>>>>> mpegts_find_stream_type(st, pes->stream_type, MISC_types); > >>>>>> + if (st->codecpar->codec_id == AV_CODEC_ID_NONE) > >>>>>> + mpegts_find_stream_type(st, pes->stream_type, > >>>>>> HLS_SAMPLE_ENC_types); > >>>>>> if (st->codecpar->codec_id == AV_CODEC_ID_NONE) { > >>>>>> st->codecpar->codec_id = old_codec_id; > >>>>>> st->codecpar->codec_type = old_codec_type; > >>>>>> -- > >>>>>> 2.17.1 > >>>>>> > >>>>>> > >>>>> _______________________________________________ > >>>>> ffmpeg-devel mailing list > >>>>> ffmpeg-devel@ffmpeg.org > >>>>> https://ffmpeg.org/mailman/listinfo/ffmpeg-devel > >>>>> > >>>>> To unsubscribe, visit link above, or email > >>>>> ffmpeg-devel-requ...@ffmpeg.org with subject "unsubscribe". > >>>> > >>>> Thanks > >>>> > >>>> Steven Liu > >>>> > >>>> > >>>> > >>>> _______________________________________________ > >>>> ffmpeg-devel mailing list > >>>> ffmpeg-devel@ffmpeg.org > >>>> https://ffmpeg.org/mailman/listinfo/ffmpeg-devel > >>>> > >>>> To unsubscribe, visit link above, or email > >>>> ffmpeg-devel-requ...@ffmpeg.org with subject "unsubscribe". > >>> _______________________________________________ > >>> ffmpeg-devel mailing list > >>> ffmpeg-devel@ffmpeg.org > >>> https://ffmpeg.org/mailman/listinfo/ffmpeg-devel > >>> > >>> To unsubscribe, visit link above, or email > >>> ffmpeg-devel-requ...@ffmpeg.org with subject "unsubscribe". > >> > >> Thanks > >> > >> Steven Liu > >> > >> > >> > >> _______________________________________________ > >> ffmpeg-devel mailing list > >> ffmpeg-devel@ffmpeg.org > >> https://ffmpeg.org/mailman/listinfo/ffmpeg-devel > >> > >> To unsubscribe, visit link above, or email > >> ffmpeg-devel-requ...@ffmpeg.org with subject "unsubscribe". > > Thanks > > Steven Liu > > > _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-devel To unsubscribe, visit link above, or email ffmpeg-devel-requ...@ffmpeg.org with subject "unsubscribe".
