mirror of https://git.ffmpeg.org/ffmpeg.git
movenc: support cenc (common encryption)
support writing encrypted mp4 using aes-ctr, conforming to ISO/IEC 23001-7. 3 new parameters were added: - encryption_scheme - allowed values are none (default) and cenc-aes-ctr - encryption_key - 128 bit encryption key (hex) - encryption_kid - 128 bit encryption key identifier (hex) Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
erankor
Michael Niedermayer
parent
23ac99dc17
commit
4469e8ebb2
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@ -2,6 +2,7 @@ Entries are sorted chronologically from oldest to youngest within each release,
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releases are sorted from youngest to oldest.
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version <next>:
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- Common Encryption (CENC) MP4 encoding support
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- DXV decoding
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- extrastereo filter
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- ocr filter
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@ -264,7 +264,7 @@ OBJS-$(CONFIG_MMF_DEMUXER) += mmf.o
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OBJS-$(CONFIG_MMF_MUXER) += mmf.o rawenc.o
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OBJS-$(CONFIG_MOV_DEMUXER) += mov.o isom.o mov_chan.o replaygain.o
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OBJS-$(CONFIG_MOV_MUXER) += movenc.o isom.o avc.o hevc.o \
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movenchint.o mov_chan.o rtp.o
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movenchint.o mov_chan.o rtp.o movenccenc.o
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OBJS-$(CONFIG_MP2_MUXER) += mp3enc.o rawenc.o id3v2enc.o
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OBJS-$(CONFIG_MP3_DEMUXER) += mp3dec.o replaygain.o
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OBJS-$(CONFIG_MP3_MUXER) += mp3enc.o rawenc.o id3v2enc.o
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@ -83,6 +83,9 @@ static const AVOption options[] = {
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{ "fragment_index", "Fragment number of the next fragment", offsetof(MOVMuxContext, fragments), AV_OPT_TYPE_INT, {.i64 = 1}, 1, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM},
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{ "mov_gamma", "gamma value for gama atom", offsetof(MOVMuxContext, gamma), AV_OPT_TYPE_FLOAT, {.dbl = 0.0 }, 0.0, 10, AV_OPT_FLAG_ENCODING_PARAM},
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{ "frag_interleave", "Interleave samples within fragments (max number of consecutive samples, lower is tighter interleaving, but with more overhead)", offsetof(MOVMuxContext, frag_interleave), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM },
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{ "encryption_scheme", "Configures the encryption scheme, allowed values are none, cenc-aes-ctr", offsetof(MOVMuxContext, encryption_scheme_str), AV_OPT_TYPE_STRING, {.str = NULL}, .flags = AV_OPT_FLAG_ENCODING_PARAM, .unit = "movflags" },
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{ "encryption_key", "The media encryption key (hex)", offsetof(MOVMuxContext, encryption_key), AV_OPT_TYPE_BINARY, .flags = AV_OPT_FLAG_ENCODING_PARAM, .unit = "movflags" },
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{ "encryption_kid", "The media encryption key identifier (hex)", offsetof(MOVMuxContext, encryption_kid), AV_OPT_TYPE_BINARY, .flags = AV_OPT_FLAG_ENCODING_PARAM, .unit = "movflags" },
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{ NULL },
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};
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@ -891,7 +894,7 @@ static int get_samples_per_packet(MOVTrack *track)
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return first_duration;
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}
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static int mov_write_audio_tag(AVIOContext *pb, MOVTrack *track)
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static int mov_write_audio_tag(AVIOContext *pb, MOVMuxContext *mov, MOVTrack *track)
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{
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int64_t pos = avio_tell(pb);
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int version = 0;
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@ -912,7 +915,11 @@ static int mov_write_audio_tag(AVIOContext *pb, MOVTrack *track)
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}
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avio_wb32(pb, 0); /* size */
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avio_wl32(pb, tag); // store it byteswapped
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if (mov->encryption_scheme != MOV_ENC_NONE) {
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ffio_wfourcc(pb, "enca");
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} else {
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avio_wl32(pb, tag); // store it byteswapped
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}
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avio_wb32(pb, 0); /* Reserved */
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avio_wb16(pb, 0); /* Reserved */
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avio_wb16(pb, 1); /* Data-reference index, XXX == 1 */
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@ -1000,6 +1007,10 @@ static int mov_write_audio_tag(AVIOContext *pb, MOVTrack *track)
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if (track->mode == MODE_MOV && track->enc->codec_type == AVMEDIA_TYPE_AUDIO)
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mov_write_chan_tag(pb, track);
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if (mov->encryption_scheme != MOV_ENC_NONE) {
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ff_mov_cenc_write_sinf_tag(track, pb, mov->encryption_kid);
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}
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return update_size(pb, pos);
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}
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@ -1659,7 +1670,11 @@ static int mov_write_video_tag(AVIOContext *pb, MOVMuxContext *mov, MOVTrack *tr
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int avid = 0;
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avio_wb32(pb, 0); /* size */
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avio_wl32(pb, track->tag); // store it byteswapped
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if (mov->encryption_scheme != MOV_ENC_NONE) {
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ffio_wfourcc(pb, "encv");
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} else {
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avio_wl32(pb, track->tag); // store it byteswapped
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}
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avio_wb32(pb, 0); /* Reserved */
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avio_wb16(pb, 0); /* Reserved */
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avio_wb16(pb, 1); /* Data-reference index */
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@ -1750,6 +1765,10 @@ static int mov_write_video_tag(AVIOContext *pb, MOVMuxContext *mov, MOVTrack *tr
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mov_write_pasp_tag(pb, track);
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}
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if (mov->encryption_scheme != MOV_ENC_NONE) {
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ff_mov_cenc_write_sinf_tag(track, pb, mov->encryption_kid);
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}
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/* extra padding for avid stsd */
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/* https://developer.apple.com/library/mac/documentation/QuickTime/QTFF/QTFFChap2/qtff2.html#//apple_ref/doc/uid/TP40000939-CH204-61112 */
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if (avid)
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@ -1848,9 +1867,9 @@ static int mov_write_stsd_tag(AVIOContext *pb, MOVMuxContext *mov, MOVTrack *tra
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avio_wb32(pb, 0); /* version & flags */
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avio_wb32(pb, 1); /* entry count */
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if (track->enc->codec_type == AVMEDIA_TYPE_VIDEO)
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mov_write_video_tag(pb, mov, track);
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mov_write_video_tag(pb, mov, track);
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else if (track->enc->codec_type == AVMEDIA_TYPE_AUDIO)
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mov_write_audio_tag(pb, track);
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mov_write_audio_tag(pb, mov, track);
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else if (track->enc->codec_type == AVMEDIA_TYPE_SUBTITLE)
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mov_write_subtitle_tag(pb, track);
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else if (track->enc->codec_tag == MKTAG('r','t','p',' '))
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@ -1980,6 +1999,9 @@ static int mov_write_stbl_tag(AVIOContext *pb, MOVMuxContext *mov, MOVTrack *tra
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mov_write_stsc_tag(pb, track);
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mov_write_stsz_tag(pb, track);
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mov_write_stco_tag(pb, track);
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if (mov->encryption_scheme == MOV_ENC_CENC_AES_CTR) {
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ff_mov_cenc_write_stbl_atoms(&track->cenc, pb);
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}
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return update_size(pb, pos);
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}
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@ -4419,7 +4441,15 @@ int ff_mov_write_packet(AVFormatContext *s, AVPacket *pkt)
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&size);
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avio_write(pb, reformatted_data, size);
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} else {
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size = ff_avc_parse_nal_units(pb, pkt->data, pkt->size);
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if (mov->encryption_scheme == MOV_ENC_CENC_AES_CTR) {
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size = ff_mov_cenc_avc_parse_nal_units(&trk->cenc, pb, pkt->data, size);
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if (size < 0) {
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ret = size;
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goto err;
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}
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} else {
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size = ff_avc_parse_nal_units(pb, pkt->data, pkt->size);
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}
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}
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} else if (enc->codec_id == AV_CODEC_ID_HEVC && trk->vos_len > 6 &&
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(AV_RB24(trk->vos_data) == 1 || AV_RB32(trk->vos_data) == 1)) {
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@ -4440,7 +4470,20 @@ int ff_mov_write_packet(AVFormatContext *s, AVPacket *pkt)
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avio_write(pb, pkt->data, size);
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#endif
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} else {
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avio_write(pb, pkt->data, size);
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if (mov->encryption_scheme == MOV_ENC_CENC_AES_CTR) {
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if (enc->codec_id == AV_CODEC_ID_H264 && enc->extradata_size > 4) {
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int nal_size_length = (enc->extradata[4] & 0x3) + 1;
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ret = ff_mov_cenc_avc_write_nal_units(s, &trk->cenc, nal_size_length, pb, pkt->data, size);
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} else {
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ret = ff_mov_cenc_write_packet(&trk->cenc, pb, pkt->data, size);
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}
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if (ret) {
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goto err;
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}
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} else {
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avio_write(pb, pkt->data, size);
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}
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}
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if ((enc->codec_id == AV_CODEC_ID_DNXHD ||
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@ -4913,6 +4956,8 @@ static void mov_free(AVFormatContext *s)
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if (mov->tracks[i].vos_len)
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av_freep(&mov->tracks[i].vos_data);
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ff_mov_cenc_free(&mov->tracks[i].cenc);
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}
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av_freep(&mov->tracks);
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@ -5123,6 +5168,31 @@ static int mov_write_header(AVFormatContext *s)
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if (!mov->tracks)
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return AVERROR(ENOMEM);
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if (mov->encryption_scheme_str != NULL && strcmp(mov->encryption_scheme_str, "none") != 0) {
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if (strcmp(mov->encryption_scheme_str, "cenc-aes-ctr") == 0) {
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mov->encryption_scheme = MOV_ENC_CENC_AES_CTR;
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if (mov->encryption_key_len != AES_CTR_KEY_SIZE) {
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av_log(s, AV_LOG_ERROR, "Invalid encryption key len %d expected %d\n",
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mov->encryption_key_len, AES_CTR_KEY_SIZE);
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ret = AVERROR(EINVAL);
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goto error;
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}
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if (mov->encryption_kid_len != CENC_KID_SIZE) {
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av_log(s, AV_LOG_ERROR, "Invalid encryption kid len %d expected %d\n",
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mov->encryption_kid_len, CENC_KID_SIZE);
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ret = AVERROR(EINVAL);
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goto error;
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}
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} else {
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av_log(s, AV_LOG_ERROR, "unsupported encryption scheme %s\n",
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mov->encryption_scheme_str);
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ret = AVERROR(EINVAL);
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goto error;
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}
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}
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for (i = 0; i < s->nb_streams; i++) {
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AVStream *st= s->streams[i];
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MOVTrack *track= &mov->tracks[i];
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@ -5241,6 +5311,14 @@ static int mov_write_header(AVFormatContext *s)
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memcpy(track->vos_data, st->codec->extradata, track->vos_len);
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}
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}
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if (mov->encryption_scheme == MOV_ENC_CENC_AES_CTR) {
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ret = ff_mov_cenc_init(&track->cenc, mov->encryption_key,
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track->enc->codec_id == AV_CODEC_ID_H264, s->flags & AVFMT_FLAG_BITEXACT);
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if (ret) {
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goto error;
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}
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}
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}
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for (i = 0; i < s->nb_streams; i++) {
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@ -25,6 +25,7 @@
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#define AVFORMAT_MOVENC_H
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#include "avformat.h"
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#include "movenccenc.h"
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#define MOV_FRAG_INFO_ALLOC_INCREMENT 64
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#define MOV_INDEX_CLUSTER_SIZE 1024
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@ -149,8 +150,15 @@ typedef struct MOVTrack {
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} vc1_info;
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void *eac3_priv;
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MOVMuxCencContext cenc;
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} MOVTrack;
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typedef enum {
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MOV_ENC_NONE = 0,
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MOV_ENC_CENC_AES_CTR,
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} MOVEncryptionScheme;
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typedef struct MOVMuxContext {
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const AVClass *av_class;
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int mode;
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@ -193,6 +201,14 @@ typedef struct MOVMuxContext {
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int frag_interleave;
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int missing_duration_warned;
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char *encryption_scheme_str;
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MOVEncryptionScheme encryption_scheme;
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uint8_t *encryption_key;
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int encryption_key_len;
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uint8_t *encryption_kid;
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int encryption_kid_len;
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} MOVMuxContext;
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#define FF_MOV_FLAG_RTP_HINT (1 << 0)
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@ -0,0 +1,415 @@
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/*
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* MOV CENC (Common Encryption) writer
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* Copyright (c) 2015 Eran Kornblau <erankor at gmail dot com>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "movenccenc.h"
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#include "libavutil/intreadwrite.h"
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#include "avio_internal.h"
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#include "movenc.h"
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#include "avc.h"
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static int auxiliary_info_alloc_size(MOVMuxCencContext* ctx, int size)
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{
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size_t new_alloc_size;
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if (ctx->auxiliary_info_size + size > ctx->auxiliary_info_alloc_size) {
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new_alloc_size = FFMAX(ctx->auxiliary_info_size + size, ctx->auxiliary_info_alloc_size * 2);
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if (av_reallocp(&ctx->auxiliary_info, new_alloc_size)) {
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return AVERROR(ENOMEM);
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}
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ctx->auxiliary_info_alloc_size = new_alloc_size;
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}
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return 0;
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}
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static int auxiliary_info_write(MOVMuxCencContext* ctx,
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const uint8_t *buf_in, int size)
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{
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int ret;
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ret = auxiliary_info_alloc_size(ctx, size);
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if (ret) {
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return ret;
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}
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memcpy(ctx->auxiliary_info + ctx->auxiliary_info_size, buf_in, size);
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ctx->auxiliary_info_size += size;
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return 0;
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}
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static int auxiliary_info_add_subsample(MOVMuxCencContext* ctx,
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uint16_t clear_bytes, uint32_t encrypted_bytes)
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{
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uint8_t* p;
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int ret;
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if (!ctx->use_subsamples) {
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return 0;
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}
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ret = auxiliary_info_alloc_size(ctx, 6);
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if (ret) {
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return ret;
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}
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p = ctx->auxiliary_info + ctx->auxiliary_info_size;
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AV_WB16(p, clear_bytes);
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p += sizeof(uint16_t);
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AV_WB32(p, encrypted_bytes);
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ctx->auxiliary_info_size += 6;
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ctx->subsample_count++;
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return 0;
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}
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/**
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* Encrypt the input buffer and write using avio_write
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*/
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static void mov_cenc_write_encrypted(MOVMuxCencContext* ctx, AVIOContext *pb,
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const uint8_t *buf_in, int size)
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{
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uint8_t chunk[4096];
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const uint8_t* cur_pos = buf_in;
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int size_left = size;
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int cur_size;
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while (size_left > 0) {
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cur_size = FFMIN(size_left, sizeof(chunk));
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av_aes_ctr_crypt(ctx->aes_ctr, chunk, cur_pos, cur_size);
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avio_write(pb, chunk, cur_size);
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cur_pos += cur_size;
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size_left -= cur_size;
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}
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}
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/**
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* Start writing a packet
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*/
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static int mov_cenc_start_packet(MOVMuxCencContext* ctx)
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{
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int ret;
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/* write the iv */
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ret = auxiliary_info_write(ctx, av_aes_ctr_get_iv(ctx->aes_ctr), AES_CTR_IV_SIZE);
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if (ret) {
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return ret;
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}
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if (!ctx->use_subsamples) {
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return 0;
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}
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/* write a zero subsample count */
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ctx->auxiliary_info_subsample_start = ctx->auxiliary_info_size;
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ctx->subsample_count = 0;
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ret = auxiliary_info_write(ctx, (uint8_t*)&ctx->subsample_count, sizeof(ctx->subsample_count));
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if (ret) {
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return ret;
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}
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return 0;
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}
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/**
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* Finalize a packet
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*/
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static int mov_cenc_end_packet(MOVMuxCencContext* ctx)
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{
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size_t new_alloc_size;
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av_aes_ctr_increment_iv(ctx->aes_ctr);
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if (!ctx->use_subsamples) {
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ctx->auxiliary_info_entries++;
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return 0;
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}
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/* add the auxiliary info entry size*/
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if (ctx->auxiliary_info_entries >= ctx->auxiliary_info_sizes_alloc_size) {
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new_alloc_size = ctx->auxiliary_info_entries * 2 + 1;
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if (av_reallocp(&ctx->auxiliary_info_sizes, new_alloc_size)) {
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return AVERROR(ENOMEM);
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}
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ctx->auxiliary_info_sizes_alloc_size = new_alloc_size;
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}
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ctx->auxiliary_info_sizes[ctx->auxiliary_info_entries] =
|
||||
AES_CTR_IV_SIZE + ctx->auxiliary_info_size - ctx->auxiliary_info_subsample_start;
|
||||
ctx->auxiliary_info_entries++;
|
||||
|
||||
/* update the subsample count*/
|
||||
AV_WB16(ctx->auxiliary_info + ctx->auxiliary_info_subsample_start, ctx->subsample_count);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
int ff_mov_cenc_write_packet(MOVMuxCencContext* ctx, AVIOContext *pb,
|
||||
const uint8_t *buf_in, int size)
|
||||
{
|
||||
int ret;
|
||||
|
||||
ret = mov_cenc_start_packet(ctx);
|
||||
if (ret) {
|
||||
return ret;
|
||||
}
|
||||
|
||||
ret = auxiliary_info_add_subsample(ctx, 0, size);
|
||||
if (ret) {
|
||||
return ret;
|
||||
}
|
||||
|
||||
mov_cenc_write_encrypted(ctx, pb, buf_in, size);
|
||||
|
||||
ret = mov_cenc_end_packet(ctx);
|
||||
if (ret) {
|
||||
return ret;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
int ff_mov_cenc_avc_parse_nal_units(MOVMuxCencContext* ctx, AVIOContext *pb,
|
||||
const uint8_t *buf_in, int size)
|
||||
{
|
||||
const uint8_t *p = buf_in;
|
||||
const uint8_t *end = p + size;
|
||||
const uint8_t *nal_start, *nal_end;
|
||||
int ret;
|
||||
|
||||
ret = mov_cenc_start_packet(ctx);
|
||||
if (ret) {
|
||||
return ret;
|
||||
}
|
||||
|
||||
size = 0;
|
||||
nal_start = ff_avc_find_startcode(p, end);
|
||||
for (;;) {
|
||||
while (nal_start < end && !*(nal_start++));
|
||||
if (nal_start == end)
|
||||
break;
|
||||
|
||||
nal_end = ff_avc_find_startcode(nal_start, end);
|
||||
|
||||
avio_wb32(pb, nal_end - nal_start);
|
||||
avio_w8(pb, *nal_start);
|
||||
mov_cenc_write_encrypted(ctx, pb, nal_start + 1, nal_end - nal_start - 1);
|
||||
|
||||
auxiliary_info_add_subsample(ctx, 5, nal_end - nal_start - 1);
|
||||
|
||||
size += 4 + nal_end - nal_start;
|
||||
nal_start = nal_end;
|
||||
}
|
||||
|
||||
ret = mov_cenc_end_packet(ctx);
|
||||
if (ret) {
|
||||
return ret;
|
||||
}
|
||||
|
||||
return size;
|
||||
}
|
||||
|
||||
int ff_mov_cenc_avc_write_nal_units(AVFormatContext *s, MOVMuxCencContext* ctx,
|
||||
int nal_length_size, AVIOContext *pb, const uint8_t *buf_in, int size)
|
||||
{
|
||||
int nalsize;
|
||||
int ret;
|
||||
int j;
|
||||
|
||||
ret = mov_cenc_start_packet(ctx);
|
||||
if (ret) {
|
||||
return ret;
|
||||
}
|
||||
|
||||
while (size > 0) {
|
||||
/* parse the nal size */
|
||||
if (size < nal_length_size + 1) {
|
||||
av_log(s, AV_LOG_ERROR, "CENC-AVC: remaining size %d smaller than nal length+type %d\n",
|
||||
size, nal_length_size + 1);
|
||||
return -1;
|
||||
}
|
||||
|
||||
avio_write(pb, buf_in, nal_length_size + 1);
|
||||
|
||||
nalsize = 0;
|
||||
for (j = 0; j < nal_length_size; j++) {
|
||||
nalsize = (nalsize << 8) | *buf_in++;
|
||||
}
|
||||
size -= nal_length_size;
|
||||
|
||||
/* encrypt the nal body */
|
||||
if (nalsize <= 0 || nalsize > size) {
|
||||
av_log(s, AV_LOG_ERROR, "CENC-AVC: nal size %d remaining %d\n", nalsize, size);
|
||||
return -1;
|
||||
}
|
||||
|
||||
mov_cenc_write_encrypted(ctx, pb, buf_in + 1, nalsize - 1);
|
||||
buf_in += nalsize;
|
||||
size -= nalsize;
|
||||
|
||||
auxiliary_info_add_subsample(ctx, nal_length_size + 1, nalsize - 1);
|
||||
}
|
||||
|
||||
ret = mov_cenc_end_packet(ctx);
|
||||
if (ret) {
|
||||
return ret;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* TODO: reuse this function from movenc.c */
|
||||
static int64_t update_size(AVIOContext *pb, int64_t pos)
|
||||
{
|
||||
int64_t curpos = avio_tell(pb);
|
||||
avio_seek(pb, pos, SEEK_SET);
|
||||
avio_wb32(pb, curpos - pos); /* rewrite size */
|
||||
avio_seek(pb, curpos, SEEK_SET);
|
||||
|
||||
return curpos - pos;
|
||||
}
|
||||
|
||||
static int mov_cenc_write_senc_tag(MOVMuxCencContext* ctx, AVIOContext *pb,
|
||||
int64_t* auxiliary_info_offset)
|
||||
{
|
||||
int64_t pos = avio_tell(pb);
|
||||
|
||||
avio_wb32(pb, 0); /* size */
|
||||
ffio_wfourcc(pb, "senc");
|
||||
avio_wb32(pb, ctx->use_subsamples ? 0x02 : 0); /* version & flags */
|
||||
avio_wb32(pb, ctx->auxiliary_info_entries); /* entry count */
|
||||
*auxiliary_info_offset = avio_tell(pb);
|
||||
avio_write(pb, ctx->auxiliary_info, ctx->auxiliary_info_size);
|
||||
return update_size(pb, pos);
|
||||
}
|
||||
|
||||
static int mov_cenc_write_saio_tag(AVIOContext *pb, int64_t auxiliary_info_offset)
|
||||
{
|
||||
int64_t pos = avio_tell(pb);
|
||||
uint8_t version;
|
||||
|
||||
avio_wb32(pb, 0); /* size */
|
||||
ffio_wfourcc(pb, "saio");
|
||||
version = auxiliary_info_offset > 0xffffffff ? 1 : 0;
|
||||
avio_w8(pb, version);
|
||||
avio_wb24(pb, 0); /* flags */
|
||||
avio_wb32(pb, 1); /* entry count */
|
||||
if (version) {
|
||||
avio_wb64(pb, auxiliary_info_offset);
|
||||
} else {
|
||||
avio_wb32(pb, auxiliary_info_offset);
|
||||
}
|
||||
return update_size(pb, pos);
|
||||
}
|
||||
|
||||
static int mov_cenc_write_saiz_tag(MOVMuxCencContext* ctx, AVIOContext *pb)
|
||||
{
|
||||
int64_t pos = avio_tell(pb);
|
||||
avio_wb32(pb, 0); /* size */
|
||||
ffio_wfourcc(pb, "saiz");
|
||||
avio_wb32(pb, 0); /* version & flags */
|
||||
avio_w8(pb, ctx->use_subsamples ? 0 : AES_CTR_IV_SIZE); /* default size*/
|
||||
avio_wb32(pb, ctx->auxiliary_info_entries); /* entry count */
|
||||
if (ctx->use_subsamples) {
|
||||
avio_write(pb, ctx->auxiliary_info_sizes, ctx->auxiliary_info_entries);
|
||||
}
|
||||
return update_size(pb, pos);
|
||||
}
|
||||
|
||||
void ff_mov_cenc_write_stbl_atoms(MOVMuxCencContext* ctx, AVIOContext *pb)
|
||||
{
|
||||
int64_t auxiliary_info_offset;
|
||||
|
||||
mov_cenc_write_senc_tag(ctx, pb, &auxiliary_info_offset);
|
||||
mov_cenc_write_saio_tag(pb, auxiliary_info_offset);
|
||||
mov_cenc_write_saiz_tag(ctx, pb);
|
||||
}
|
||||
|
||||
static int mov_cenc_write_schi_tag(AVIOContext *pb, uint8_t* kid)
|
||||
{
|
||||
int64_t pos = avio_tell(pb);
|
||||
avio_wb32(pb, 0); /* size */
|
||||
ffio_wfourcc(pb, "schi");
|
||||
|
||||
avio_wb32(pb, 32); /* size */
|
||||
ffio_wfourcc(pb, "tenc");
|
||||
avio_wb32(pb, 0); /* version & flags */
|
||||
avio_wb24(pb, 1); /* is encrypted */
|
||||
avio_w8(pb, AES_CTR_IV_SIZE); /* iv size */
|
||||
avio_write(pb, kid, CENC_KID_SIZE);
|
||||
|
||||
return update_size(pb, pos);
|
||||
}
|
||||
|
||||
int ff_mov_cenc_write_sinf_tag(MOVTrack* track, AVIOContext *pb, uint8_t* kid)
|
||||
{
|
||||
int64_t pos = avio_tell(pb);
|
||||
avio_wb32(pb, 0); /* size */
|
||||
ffio_wfourcc(pb, "sinf");
|
||||
|
||||
/* frma */
|
||||
avio_wb32(pb, 12); /* size */
|
||||
ffio_wfourcc(pb, "frma");
|
||||
avio_wl32(pb, track->tag);
|
||||
|
||||
/* schm */
|
||||
avio_wb32(pb, 20); /* size */
|
||||
ffio_wfourcc(pb, "schm");
|
||||
avio_wb32(pb, 0); /* version & flags */
|
||||
ffio_wfourcc(pb, "cenc"); /* scheme type*/
|
||||
avio_wb32(pb, 0x10000); /* scheme version */
|
||||
|
||||
/* schi */
|
||||
mov_cenc_write_schi_tag(pb, kid);
|
||||
|
||||
return update_size(pb, pos);
|
||||
}
|
||||
|
||||
int ff_mov_cenc_init(MOVMuxCencContext* ctx, uint8_t* encryption_key,
|
||||
int use_subsamples, int bitexact)
|
||||
{
|
||||
int ret;
|
||||
|
||||
ctx->aes_ctr = av_aes_ctr_alloc();
|
||||
if (!ctx->aes_ctr) {
|
||||
return AVERROR(ENOMEM);
|
||||
}
|
||||
|
||||
ret = av_aes_ctr_init(ctx->aes_ctr, encryption_key);
|
||||
if (ret != 0) {
|
||||
return ret;
|
||||
}
|
||||
|
||||
if (!bitexact) {
|
||||
av_aes_ctr_set_random_iv(ctx->aes_ctr);
|
||||
}
|
||||
|
||||
ctx->use_subsamples = use_subsamples;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
void ff_mov_cenc_free(MOVMuxCencContext* ctx)
|
||||
{
|
||||
av_aes_ctr_free(ctx->aes_ctr);
|
||||
}
|
||||
|
|
@ -0,0 +1,86 @@
|
|||
/*
|
||||
* MOV CENC (Common Encryption) writer
|
||||
* Copyright (c) 2015 Eran Kornblau <erankor at gmail dot com>
|
||||
*
|
||||
* 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
|
||||
*/
|
||||
|
||||
#ifndef AVFORMAT_MOVENCCENC_H
|
||||
#define AVFORMAT_MOVENCCENC_H
|
||||
|
||||
#include "libavutil/aes_ctr.h"
|
||||
#include "avformat.h"
|
||||
#include "avio.h"
|
||||
|
||||
#define CENC_KID_SIZE (16)
|
||||
|
||||
struct MOVTrack;
|
||||
|
||||
typedef struct {
|
||||
struct AVAESCTR* aes_ctr;
|
||||
uint8_t* auxiliary_info;
|
||||
size_t auxiliary_info_size;
|
||||
size_t auxiliary_info_alloc_size;
|
||||
uint32_t auxiliary_info_entries;
|
||||
|
||||
/* subsample support */
|
||||
int use_subsamples;
|
||||
uint16_t subsample_count;
|
||||
size_t auxiliary_info_subsample_start;
|
||||
uint8_t* auxiliary_info_sizes;
|
||||
size_t auxiliary_info_sizes_alloc_size;
|
||||
} MOVMuxCencContext;
|
||||
|
||||
/**
|
||||
* Initialize a CENC context
|
||||
* @param key encryption key, must have a length of AES_CTR_KEY_SIZE
|
||||
* @param use_subsamples when enabled parts of a packet can be encrypted, otherwise the whole packet is encrypted
|
||||
*/
|
||||
int ff_mov_cenc_init(MOVMuxCencContext* ctx, uint8_t* encryption_key, int use_subsamples, int bitexact);
|
||||
|
||||
/**
|
||||
* Free a CENC context
|
||||
*/
|
||||
void ff_mov_cenc_free(MOVMuxCencContext* ctx);
|
||||
|
||||
/**
|
||||
* Write a fully encrypted packet
|
||||
*/
|
||||
int ff_mov_cenc_write_packet(MOVMuxCencContext* ctx, AVIOContext *pb, const uint8_t *buf_in, int size);
|
||||
|
||||
/**
|
||||
* Parse AVC NAL units from annex B format, the nal size and type are written in the clear while the body is encrypted
|
||||
*/
|
||||
int ff_mov_cenc_avc_parse_nal_units(MOVMuxCencContext* ctx, AVIOContext *pb, const uint8_t *buf_in, int size);
|
||||
|
||||
/**
|
||||
* Write AVC NAL units that are in MP4 format, the nal size and type are written in the clear while the body is encrypted
|
||||
*/
|
||||
int ff_mov_cenc_avc_write_nal_units(AVFormatContext *s, MOVMuxCencContext* ctx, int nal_length_size,
|
||||
AVIOContext *pb, const uint8_t *buf_in, int size);
|
||||
|
||||
/**
|
||||
* Write the cenc atoms that should reside inside stbl
|
||||
*/
|
||||
void ff_mov_cenc_write_stbl_atoms(MOVMuxCencContext* ctx, AVIOContext *pb);
|
||||
|
||||
/**
|
||||
* Write the sinf atom, contained inside stsd
|
||||
*/
|
||||
int ff_mov_cenc_write_sinf_tag(struct MOVTrack* track, AVIOContext *pb, uint8_t* kid);
|
||||
|
||||
#endif /* AVFORMAT_MOVENCCENC_H */
|
||||
Loading…
Reference in New Issue