avformat/mov: Increase support for common encryption.

- Parse schm atom to get different encryption schemes.
- Allow senc atom to appear in track fragments.
- Allow 16-byte IVs.
- Allow constant IVs (specified in tenc).
- Allow only tenc to specify encryption (i.e. no senc/saiz/saio).
- Use sample descriptor to detect clear fragments.

This doesn't support:
- Different sample descriptor holding different encryption info.
  - Only first sample descriptor can be encrypted.
- Encrypted sample groups (i.e. seig).
- Non-'cenc' encryption scheme when using -decryption_key.

Signed-off-by: Jacob Trimble <modmaker@google.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

6 files changed, 450 insertions, 82 deletions

diff --git a/libavformat/isom.h b/libavformat/isom.h
index 4da34142f0..eb942cf882 100644
--- a/libavformat/isom.h
+++ b/libavformat/isom.h
@@ -27,6 +27,7 @@
 #include <stddef.h>
 #include <stdint.h>
 
+#include "libavutil/encryption_info.h"
 #include "libavutil/mastering_display_metadata.h"
 #include "libavutil/spherical.h"
 #include "libavutil/stereo3d.h"
@@ -108,12 +109,20 @@ typedef struct MOVSbgp {
     unsigned int index;
 } MOVSbgp;
 
+typedef struct MOVEncryptionIndex {
+    // Individual encrypted samples.  If there are no elements, then the default
+    // settings will be used.
+    unsigned int nb_encrypted_samples;
+    AVEncryptionInfo **encrypted_samples;
+} MOVEncryptionIndex;
+
 typedef struct MOVFragmentStreamInfo {
     int id;
     int64_t sidx_pts;
     int64_t first_tfra_pts;
     int64_t tfdt_dts;
     int index_entry;
+    MOVEncryptionIndex *encryption_index;
 } MOVFragmentStreamInfo;
 
 typedef struct MOVFragmentIndexItem {
@@ -215,6 +224,7 @@ typedef struct MOVStreamContext {
 
     int has_sidx;  // If there is an sidx entry for this stream.
     struct {
+        // TODO: Remove once old methods are removed from mov.c
         int use_subsamples;
         uint8_t* auxiliary_info;
         uint8_t* auxiliary_info_end;
@@ -223,7 +233,11 @@ typedef struct MOVStreamContext {
         uint8_t* auxiliary_info_sizes;
         size_t auxiliary_info_sizes_count;
         int64_t auxiliary_info_index;
+
         struct AVAESCTR* aes_ctr;
+        unsigned int per_sample_iv_size;  // Either 0, 8, or 16.
+        AVEncryptionInfo *default_encrypted_sample;
+        MOVEncryptionIndex *encryption_index;
     } cenc;
 } MOVStreamContext;
 
diff --git a/libavformat/mov.c b/libavformat/mov.c
index 1340bf3913..fc512b8d72 100644
--- a/libavformat/mov.c
+++ b/libavformat/mov.c
@@ -1330,6 +1330,7 @@ static int update_frag_index(MOVContext *c, int64_t offset)
         frag_stream_info[i].tfdt_dts = AV_NOPTS_VALUE;
         frag_stream_info[i].first_tfra_pts = AV_NOPTS_VALUE;
         frag_stream_info[i].index_entry = -1;
+        frag_stream_info[i].encryption_index = NULL;
     }
 
     if (index < c->frag_index.nb_items)
@@ -5761,57 +5762,250 @@ static int mov_read_frma(MOVContext *c, AVIOContext *pb, MOVAtom atom)
     return 0;
 }
 
-static int mov_read_senc(MOVContext *c, AVIOContext *pb, MOVAtom atom)
+/**
+ * Gets the current encryption info and associated current stream context.  If
+ * we are parsing a track fragment, this will return the specific encryption
+ * info for this fragment; otherwise this will return the global encryption
+ * info for the current stream.
+ */
+static int get_current_encryption_info(MOVContext *c, MOVEncryptionIndex **encryption_index, MOVStreamContext **sc)
 {
+    MOVFragmentStreamInfo *frag_stream_info;
     AVStream *st;
+    int i;
+
+    frag_stream_info = get_current_frag_stream_info(&c->frag_index);
+    if (frag_stream_info) {
+        for (i = 0; i < c->fc->nb_streams; i++) {
+            if (c->fc->streams[i]->id == frag_stream_info->id) {
+              st = c->fc->streams[i];
+              break;
+            }
+        }
+        if (i == c->fc->nb_streams)
+            return 0;
+        *sc = st->priv_data;
+
+        if (!frag_stream_info->encryption_index) {
+            frag_stream_info->encryption_index = av_mallocz(sizeof(*frag_stream_info->encryption_index));
+            if (!frag_stream_info->encryption_index)
+                return AVERROR(ENOMEM);
+        }
+        *encryption_index = frag_stream_info->encryption_index;
+        return 1;
+    } else {
+        // No current track fragment, using stream level encryption info.
+
+        if (c->fc->nb_streams < 1)
+            return 0;
+        st = c->fc->streams[c->fc->nb_streams - 1];
+        *sc = st->priv_data;
+
+        if (!(*sc)->cenc.encryption_index) {
+            (*sc)->cenc.encryption_index = av_mallocz(sizeof(*frag_stream_info->encryption_index));
+            if (!(*sc)->cenc.encryption_index)
+                return AVERROR(ENOMEM);
+        }
+
+        *encryption_index = (*sc)->cenc.encryption_index;
+        return 1;
+    }
+}
+
+static int mov_read_sample_encryption_info(MOVContext *c, AVIOContext *pb, MOVStreamContext *sc, AVEncryptionInfo **sample, int use_subsamples)
+{
+    int i;
+    unsigned int subsample_count;
+    AVSubsampleEncryptionInfo *subsamples;
+
+    *sample = av_encryption_info_clone(sc->cenc.default_encrypted_sample);
+    if (!*sample)
+        return AVERROR(ENOMEM);
+
+    if (sc->cenc.per_sample_iv_size != 0) {
+        if (avio_read(pb, (*sample)->iv, sc->cenc.per_sample_iv_size) != sc->cenc.per_sample_iv_size) {
+            av_log(c->fc, AV_LOG_ERROR, "failed to read the initialization vector\n");
+            av_encryption_info_free(*sample);
+            *sample = NULL;
+            return AVERROR_INVALIDDATA;
+        }
+    }
+
+    if (use_subsamples) {
+        subsample_count = avio_rb16(pb);
+        (*sample)->subsamples = av_mallocz_array(subsample_count, sizeof(*subsamples));
+        if (!(*sample)->subsamples) {
+            av_encryption_info_free(*sample);
+            *sample = NULL;
+            return AVERROR(ENOMEM);
+        }
+
+        for (i = 0; i < subsample_count && !pb->eof_reached; i++) {
+            (*sample)->subsamples[i].bytes_of_clear_data = avio_rb16(pb);
+            (*sample)->subsamples[i].bytes_of_protected_data = avio_rb32(pb);
+        }
+
+        if (pb->eof_reached) {
+            av_log(c->fc, AV_LOG_ERROR, "hit EOF while reading sub-sample encryption info\n");
+            av_encryption_info_free(*sample);
+            *sample = NULL;
+            return AVERROR_INVALIDDATA;
+        }
+        (*sample)->subsample_count = subsample_count;
+    }
+
+    return 0;
+}
+
+static int mov_read_senc(MOVContext *c, AVIOContext *pb, MOVAtom atom)
+{
+    AVEncryptionInfo **encrypted_samples;
+    MOVEncryptionIndex *encryption_index;
     MOVStreamContext *sc;
-    size_t auxiliary_info_size;
+    int use_subsamples, ret;
+    unsigned int sample_count, i, alloc_size = 0;
 
-    if (c->decryption_key_len == 0 || c->fc->nb_streams < 1)
+    ret = get_current_encryption_info(c, &encryption_index, &sc);
+    if (ret != 1)
+        return ret;
+
+    if (encryption_index->nb_encrypted_samples) {
+        // This can happen if we have both saio/saiz and senc atoms.
+        av_log(c->fc, AV_LOG_DEBUG, "Ignoring duplicate encryption info in senc\n");
         return 0;
+    }
 
-    st = c->fc->streams[c->fc->nb_streams - 1];
-    sc = st->priv_data;
+    avio_r8(pb); /* version */
+    use_subsamples = avio_rb24(pb) & 0x02; /* flags */
 
-    if (sc->cenc.aes_ctr) {
-        av_log(c->fc, AV_LOG_ERROR, "duplicate senc atom\n");
-        return AVERROR_INVALIDDATA;
+    sample_count = avio_rb32(pb);
+    if (sample_count >= INT_MAX / sizeof(*encrypted_samples))
+        return AVERROR(ENOMEM);
+
+    for (i = 0; i < sample_count; i++) {
+        unsigned int min_samples = FFMIN(FFMAX(i, 1024 * 1024), sample_count);
+        encrypted_samples = av_fast_realloc(encryption_index->encrypted_samples, &alloc_size,
+                                            min_samples * sizeof(*encrypted_samples));
+        if (encrypted_samples) {
+            encryption_index->encrypted_samples = encrypted_samples;
+
+            ret = mov_read_sample_encryption_info(
+                c, pb, sc, &encryption_index->encrypted_samples[i], use_subsamples);
+        } else {
+            ret = AVERROR(ENOMEM);
+        }
+        if (pb->eof_reached) {
+            av_log(c->fc, AV_LOG_ERROR, "Hit EOF while reading senc\n");
+            ret = AVERROR_INVALIDDATA;
+        }
+
+        if (ret < 0) {
+            for (; i > 0; i--)
+                av_encryption_info_free(encryption_index->encrypted_samples[i - 1]);
+            av_freep(&encryption_index->encrypted_samples);
+            return ret;
+        }
     }
+    encryption_index->nb_encrypted_samples = sample_count;
 
-    avio_r8(pb); /* version */
-    sc->cenc.use_subsamples = avio_rb24(pb) & 0x02; /* flags */
+    return 0;
+}
 
-    avio_rb32(pb);        /* entries */
+static int mov_read_schm(MOVContext *c, AVIOContext *pb, MOVAtom atom)
+{
+    AVStream *st;
+    MOVStreamContext *sc;
 
-    if (atom.size < 8 || atom.size > FFMIN(INT_MAX, SIZE_MAX)) {
-        av_log(c->fc, AV_LOG_ERROR, "senc atom size %"PRId64" invalid\n", atom.size);
+    if (c->fc->nb_streams < 1)
+        return 0;
+    st = c->fc->streams[c->fc->nb_streams-1];
+    sc = st->priv_data;
+
+    if (sc->pseudo_stream_id != 0) {
+        av_log(c->fc, AV_LOG_ERROR, "schm boxes are only supported in first sample descriptor\n");
+        return AVERROR_PATCHWELCOME;
+    }
+
+    if (atom.size < 8)
         return AVERROR_INVALIDDATA;
+
+    avio_rb32(pb); /* version and flags */
+
+    if (!sc->cenc.default_encrypted_sample) {
+        sc->cenc.default_encrypted_sample = av_encryption_info_alloc(0, 16, 16);
+        if (!sc->cenc.default_encrypted_sample) {
+            return AVERROR(ENOMEM);
+        }
     }
 
-    /* save the auxiliary info as is */
-    auxiliary_info_size = atom.size - 8;
+    sc->cenc.default_encrypted_sample->scheme = avio_rb32(pb);
+    return 0;
+}
 
-    sc->cenc.auxiliary_info = av_malloc(auxiliary_info_size);
-    if (!sc->cenc.auxiliary_info) {
-        return AVERROR(ENOMEM);
+static int mov_read_tenc(MOVContext *c, AVIOContext *pb, MOVAtom atom)
+{
+    AVStream *st;
+    MOVStreamContext *sc;
+    unsigned int version, pattern, is_protected, iv_size;
+
+    if (c->fc->nb_streams < 1)
+        return 0;
+    st = c->fc->streams[c->fc->nb_streams-1];
+    sc = st->priv_data;
+
+    if (sc->pseudo_stream_id != 0) {
+        av_log(c->fc, AV_LOG_ERROR, "tenc atom are only supported in first sample descriptor\n");
+        return AVERROR_PATCHWELCOME;
     }
 
-    sc->cenc.auxiliary_info_end = sc->cenc.auxiliary_info + auxiliary_info_size;
-    sc->cenc.auxiliary_info_pos = sc->cenc.auxiliary_info;
-    sc->cenc.auxiliary_info_index = 0;
+    if (!sc->cenc.default_encrypted_sample) {
+        sc->cenc.default_encrypted_sample = av_encryption_info_alloc(0, 16, 16);
+        if (!sc->cenc.default_encrypted_sample) {
+            return AVERROR(ENOMEM);
+        }
+    }
 
-    if (avio_read(pb, sc->cenc.auxiliary_info, auxiliary_info_size) != auxiliary_info_size) {
-        av_log(c->fc, AV_LOG_ERROR, "failed to read the auxiliary info");
+    if (atom.size < 20)
         return AVERROR_INVALIDDATA;
+
+    version = avio_r8(pb); /* version */
+    avio_rb24(pb); /* flags */
+
+    avio_r8(pb); /* reserved */
+    pattern = avio_r8(pb);
+
+    if (version > 0) {
+        sc->cenc.default_encrypted_sample->crypt_byte_block = pattern >> 4;
+        sc->cenc.default_encrypted_sample->skip_byte_block = pattern & 0xf;
     }
 
-    /* initialize the cipher */
-    sc->cenc.aes_ctr = av_aes_ctr_alloc();
-    if (!sc->cenc.aes_ctr) {
-        return AVERROR(ENOMEM);
+    is_protected = avio_r8(pb);
+    if (is_protected && !sc->cenc.encryption_index) {
+        // The whole stream should be by-default encrypted.
+        sc->cenc.encryption_index = av_mallocz(sizeof(MOVEncryptionIndex));
+        if (!sc->cenc.encryption_index)
+            return AVERROR(ENOMEM);
+    }
+    sc->cenc.per_sample_iv_size = avio_r8(pb);
+    if (avio_read(pb, sc->cenc.default_encrypted_sample->key_id, 16) != 16) {
+        av_log(c->fc, AV_LOG_ERROR, "failed to read the default key ID");
+        return AVERROR_INVALIDDATA;
     }
 
-    return av_aes_ctr_init(sc->cenc.aes_ctr, c->decryption_key);
+    if (is_protected && !sc->cenc.per_sample_iv_size) {
+        iv_size = avio_r8(pb);
+        if (iv_size != 8 && iv_size != 16) {
+            av_log(c->fc, AV_LOG_ERROR, "invalid default_constant_IV_size in tenc atom\n");
+            return AVERROR_INVALIDDATA;
+        }
+
+        if (avio_read(pb, sc->cenc.default_encrypted_sample->iv, iv_size) != iv_size) {
+            av_log(c->fc, AV_LOG_ERROR, "failed to read the default IV");
+            return AVERROR_INVALIDDATA;
+        }
+    }
+
+    return 0;
 }
 
 static int mov_read_saiz(MOVContext *c, AVIOContext *pb, MOVAtom atom)
@@ -5942,78 +6136,103 @@ static int mov_seek_auxiliary_info(MOVContext *c, MOVStreamContext *sc, int64_t
     return 0;
 }
 
-static int cenc_filter(MOVContext *c, MOVStreamContext *sc, int64_t index, uint8_t *input, int size)
+static int cenc_decrypt(MOVContext *c, MOVStreamContext *sc, AVEncryptionInfo *sample, uint8_t *input, int size)
 {
-    uint32_t encrypted_bytes;
-    uint16_t subsample_count;
-    uint16_t clear_bytes;
-    uint8_t* input_end = input + size;
-    int ret;
+    int i, ret;
 
-    if (index != sc->cenc.auxiliary_info_index) {
-        ret = mov_seek_auxiliary_info(c, sc, index);
+    if (sample->scheme != MKBETAG('c','e','n','c') || sample->crypt_byte_block != 0 || sample->skip_byte_block != 0) {
+        av_log(c->fc, AV_LOG_ERROR, "Only the 'cenc' encryption scheme is supported\n");
+        return AVERROR_PATCHWELCOME;
+    }
+
+    if (!sc->cenc.aes_ctr) {
+        /* initialize the cipher */
+        sc->cenc.aes_ctr = av_aes_ctr_alloc();
+        if (!sc->cenc.aes_ctr) {
+            return AVERROR(ENOMEM);
+        }
+
+        ret = av_aes_ctr_init(sc->cenc.aes_ctr, c->decryption_key);
         if (ret < 0) {
             return ret;
         }
     }
 
-    /* read the iv */
-    if (AES_CTR_IV_SIZE > sc->cenc.auxiliary_info_end - sc->cenc.auxiliary_info_pos) {
-        av_log(c->fc, AV_LOG_ERROR, "failed to read iv from the auxiliary info\n");
-        return AVERROR_INVALIDDATA;
-    }
-
-    av_aes_ctr_set_iv(sc->cenc.aes_ctr, sc->cenc.auxiliary_info_pos);
-    sc->cenc.auxiliary_info_pos += AES_CTR_IV_SIZE;
+    av_aes_ctr_set_full_iv(sc->cenc.aes_ctr, sample->iv);
 
-    if (!sc->cenc.use_subsamples)
+    if (!sample->subsample_count)
     {
         /* decrypt the whole packet */
         av_aes_ctr_crypt(sc->cenc.aes_ctr, input, input, size);
         return 0;
     }
 
-    /* read the subsample count */
-    if (sizeof(uint16_t) > sc->cenc.auxiliary_info_end - sc->cenc.auxiliary_info_pos) {
-        av_log(c->fc, AV_LOG_ERROR, "failed to read subsample count from the auxiliary info\n");
-        return AVERROR_INVALIDDATA;
-    }
-
-    subsample_count = AV_RB16(sc->cenc.auxiliary_info_pos);
-    sc->cenc.auxiliary_info_pos += sizeof(uint16_t);
-
-    for (; subsample_count > 0; subsample_count--)
+    for (i = 0; i < sample->subsample_count; i++)
     {
-        if (6 > sc->cenc.auxiliary_info_end - sc->cenc.auxiliary_info_pos) {
-            av_log(c->fc, AV_LOG_ERROR, "failed to read subsample from the auxiliary info\n");
-            return AVERROR_INVALIDDATA;
-        }
-
-        /* read the number of clear / encrypted bytes */
-        clear_bytes = AV_RB16(sc->cenc.auxiliary_info_pos);
-        sc->cenc.auxiliary_info_pos += sizeof(uint16_t);
-        encrypted_bytes = AV_RB32(sc->cenc.auxiliary_info_pos);
-        sc->cenc.auxiliary_info_pos += sizeof(uint32_t);
-
-        if ((uint64_t)clear_bytes + encrypted_bytes > input_end - input) {
+        if (sample->subsamples[i].bytes_of_clear_data + sample->subsamples[i].bytes_of_protected_data > size) {
             av_log(c->fc, AV_LOG_ERROR, "subsample size exceeds the packet size left\n");
             return AVERROR_INVALIDDATA;
         }
 
         /* skip the clear bytes */
-        input += clear_bytes;
+        input += sample->subsamples[i].bytes_of_clear_data;
+        size -= sample->subsamples[i].bytes_of_clear_data;
 
         /* decrypt the encrypted bytes */
-        av_aes_ctr_crypt(sc->cenc.aes_ctr, input, input, encrypted_bytes);
-        input += encrypted_bytes;
+        av_aes_ctr_crypt(sc->cenc.aes_ctr, input, input, sample->subsamples[i].bytes_of_protected_data);
+        input += sample->subsamples[i].bytes_of_protected_data;
+        size -= sample->subsamples[i].bytes_of_protected_data;
     }
 
-    if (input < input_end) {
+    if (size > 0) {
         av_log(c->fc, AV_LOG_ERROR, "leftover packet bytes after subsample processing\n");
         return AVERROR_INVALIDDATA;
     }
 
-    sc->cenc.auxiliary_info_index++;
+    return 0;
+}
+
+static int cenc_filter(MOVContext *mov, MOVStreamContext *sc, AVPacket *pkt, int current_index)
+{
+    MOVFragmentStreamInfo *frag_stream_info;
+    MOVEncryptionIndex *encryption_index;
+    AVEncryptionInfo *encrypted_sample;
+    int encrypted_index;
+
+    frag_stream_info = get_current_frag_stream_info(&mov->frag_index);
+    encrypted_index = current_index;
+    encryption_index = NULL;
+    if (frag_stream_info) {
+        // Note this only supports encryption info in the first sample descriptor.
+        if (mov->fragment.stsd_id == 1) {
+            if (frag_stream_info->encryption_index) {
+                encrypted_index = current_index - frag_stream_info->index_entry;
+                encryption_index = frag_stream_info->encryption_index;
+            } else {
+                encryption_index = sc->cenc.encryption_index;
+            }
+        }
+    } else {
+        encryption_index = sc->cenc.encryption_index;
+    }
+
+    if (encryption_index) {
+        if (!encryption_index->nb_encrypted_samples) {
+            // Full-sample encryption with default settings.
+            encrypted_sample = sc->cenc.default_encrypted_sample;
+        } else if (encrypted_index >= 0 && encrypted_index < encryption_index->nb_encrypted_samples) {
+            // Per-sample setting override.
+            encrypted_sample = encryption_index->encrypted_samples[encrypted_index];
+        } else {
+            av_log(mov->fc, AV_LOG_ERROR, "Incorrect number of samples in encryption info\n");
+            return AVERROR_INVALIDDATA;
+        }
+
+        if (mov->decryption_key) {
+            return cenc_decrypt(mov, sc, encrypted_sample, pkt->data, pkt->size);
+        }
+    }
+
     return 0;
 }
 
@@ -6142,7 +6361,9 @@ static const MOVParseTableEntry mov_default_parse_table[] = {
 { MKTAG('s','i','n','f'), mov_read_default },
 { MKTAG('f','r','m','a'), mov_read_frma },
 { MKTAG('s','e','n','c'), mov_read_senc },
-{ MKTAG('s','a','i','z'), mov_read_saiz },
+{ MKTAG('s','c','h','m'), mov_read_schm },
+{ MKTAG('s','c','h','i'), mov_read_default },
+{ MKTAG('t','e','n','c'), mov_read_tenc },
 { MKTAG('d','f','L','a'), mov_read_dfla },
 { MKTAG('s','t','3','d'), mov_read_st3d }, /* stereoscopic 3D video box */
 { MKTAG('s','v','3','d'), mov_read_sv3d }, /* spherical video box */
@@ -6528,6 +6749,16 @@ static int mov_read_timecode_track(AVFormatContext *s, AVStream *st)
     return 0;
 }
 
+static void mov_free_encryption_index(MOVEncryptionIndex **index) {
+    int i;
+    if (!index || !*index) return;
+    for (i = 0; i < (*index)->nb_encrypted_samples; i++) {
+        av_encryption_info_free((*index)->encrypted_samples[i]);
+    }
+    av_freep(&(*index)->encrypted_samples);
+    av_freep(index);
+}
+
 static int mov_read_close(AVFormatContext *s)
 {
     MOVContext *mov = s->priv_data;
@@ -6570,8 +6801,8 @@ static int mov_read_close(AVFormatContext *s)
         av_freep(&sc->extradata);
         av_freep(&sc->extradata_size);
 
-        av_freep(&sc->cenc.auxiliary_info);
-        av_freep(&sc->cenc.auxiliary_info_sizes);
+        mov_free_encryption_index(&sc->cenc.encryption_index);
+        av_encryption_info_free(sc->cenc.default_encrypted_sample);
         av_aes_ctr_free(sc->cenc.aes_ctr);
 
         av_freep(&sc->stereo3d);
@@ -6596,6 +6827,10 @@ static int mov_read_close(AVFormatContext *s)
     av_freep(&mov->bitrates);
 
     for (i = 0; i < mov->frag_index.nb_items; i++) {
+        MOVFragmentStreamInfo *frag = mov->frag_index.item[i].stream_info;
+        for (j = 0; j < mov->frag_index.item[i].nb_stream_info; j++) {
+            mov_free_encryption_index(&frag[j].encryption_index);
+        }
         av_freep(&mov->frag_index.item[i].stream_info);
     }
     av_freep(&mov->frag_index.item);
@@ -7166,12 +7401,9 @@ static int mov_read_packet(AVFormatContext *s, AVPacket *pkt)
     if (mov->aax_mode)
         aax_filter(pkt->data, pkt->size, mov);
 
-    if (sc->cenc.aes_ctr) {
-        ret = cenc_filter(mov, sc, current_index, pkt->data, pkt->size);
-        if (ret) {
-            return ret;
-        }
-    }
+    ret = cenc_filter(mov, sc, pkt, current_index);
+    if (ret < 0)
+        return ret;
 
     return 0;
 }
diff --git a/libavutil/encryption_info.h b/libavutil/encryption_info.h
index 47dc3a35ca..ec5501aac7 100644
--- a/libavutil/encryption_info.h
+++ b/libavutil/encryption_info.h
@@ -41,7 +41,7 @@ typedef struct AVSubsampleEncryptionInfo {
  * The size of this struct is not part of the public ABI.
  */
 typedef struct AVEncryptionInfo {
-    /** The fourcc encryption scheme. */
+    /** The fourcc encryption scheme, in big-endian byte order. */
     uint32_t scheme;
 
     /**
diff --git a/tests/fate/mov.mak b/tests/fate/mov.mak
index 9d7d62a023..eadee3abfa 100644
--- a/tests/fate/mov.mak
+++ b/tests/fate/mov.mak
@@ -6,6 +6,8 @@ FATE_MOV = fate-mov-3elist \
            fate-mov-1elist-ends-last-bframe \
            fate-mov-2elist-elist1-ends-bframe \
            fate-mov-3elist-encrypted \
+           fate-mov-frag-encrypted \
+           fate-mov-tenc-only-encrypted \
            fate-mov-invalid-elst-entry-count \
            fate-mov-gpmf-remux \
            fate-mov-440hz-10ms \
@@ -39,6 +41,12 @@ fate-mov-3elist-1ctts: CMD = framemd5 -i $(TARGET_SAMPLES)/mov/mov-3elist-1ctts.
 # Edit list with encryption
 fate-mov-3elist-encrypted: CMD = framemd5 -decryption_key 12345678901234567890123456789012 -i $(TARGET_SAMPLES)/mov/mov-3elist-encrypted.mov
 
+# Fragmented encryption with senc boxes in movie fragments.
+fate-mov-frag-encrypted: CMD = framemd5 -decryption_key 12345678901234567890123456789012 -i $(TARGET_SAMPLES)/mov/mov-frag-encrypted.mp4
+
+# Full-sample encryption and constant IV using only tenc atom (no senc/saio/saiz).
+fate-mov-tenc-only-encrypted: CMD = framemd5 -decryption_key 12345678901234567890123456789012 -i $(TARGET_SAMPLES)/mov/mov-tenc-only-encrypted.mp4
+
 # Makes sure that the CTTS is also modified when we fix avindex in mov.c while parsing edit lists.
 fate-mov-elist-starts-ctts-2ndsample: CMD = framemd5 -i $(TARGET_SAMPLES)/mov/mov-elist-starts-ctts-2ndsample.mov
 
diff --git a/tests/ref/fate/mov-frag-encrypted b/tests/ref/fate/mov-frag-encrypted
new file mode 100644
index 0000000000..e6c109b566
--- /dev/null
+++ b/tests/ref/fate/mov-frag-encrypted
@@ -0,0 +1,57 @@
+#format: frame checksums
+#version: 2
+#hash: MD5
+#tb 0: 1/24
+#media_type 0: video
+#codec_id 0: rawvideo
+#dimensions 0: 120x52
+#sar 0: 544/545
+#stream#, dts,        pts, duration,     size, hash
+0,          0,          0,        1,     9360, 920bdc277a6a31c1daed9aca44b10caf
+0,          1,          1,        1,     9360, f1c0b61fef593de57cb97be7fa846569
+0,          2,          2,        1,     9360, 6ef32d9d4398355aebf6d3fb11d51d3f
+0,          3,          3,        1,     9360, d38fd3ef1e5a92fc109b8dd9eb6dadeb
+0,          4,          4,        1,     9360, 54cc0c8a25d2f14f32663837d5e646f1
+0,          5,          5,        1,     9360, b4b6829726dc3decb8b80ba0c35bcf30
+0,          6,          6,        1,     9360, fca3f941e60a2f0a4ce30d5e0efbec3c
+0,          7,          7,        1,     9360, cda6e26b6c1039ff3d229b262c9210c3
+0,          8,          8,        1,     9360, f0d69255e3a27a8b4ae8a4b7b210929d
+0,          9,          9,        1,     9360, 12cb23dd4e32af9c3b35f943714e3fdd
+0,         10,         10,        1,     9360, 082aaf3216124ddcecb422fe5c832e82
+0,         11,         11,        1,     9360, ff37bb8cd6bd0412a3b3cb45db54afc9
+0,         12,         12,        1,     9360, dfb9085441575732844b6c2f05d5f542
+0,         13,         13,        1,     9360, 0017100feaaa9fc7eacd2447d50d7542
+0,         14,         14,        1,     9360, 4e2f1b8c4e04c59934c2f58541e62613
+0,         15,         15,        1,     9360, 27a44dfea7cd2d30e488194c34ab473c
+0,         16,         16,        1,     9360, fc7b56bd95e990a33cf575d1ef820902
+0,         17,         17,        1,     9360, fa2d1609e69714dffc410e65f3c8b755
+0,         18,         18,        1,     9360, 705d7429f447cb13febe202d567795f2
+0,         19,         19,        1,     9360, 234802ce86e868faaf2cd40a286846ea
+0,         20,         20,        1,     9360, 2f0354b40d211d0a4ade4568bea4f85e
+0,         21,         21,        1,     9360, e96af3b6c0cc931463ca77d6be0f1148
+0,         22,         22,        1,     9360, 04a904d798361959971361401879c7e4
+0,         23,         23,        1,     9360, 2f119642340df6d25362b5590ded46b7
+0,         24,         24,        1,     9360, 5993fca2e60050706f857ac76e48f386
+0,         25,         25,        1,     9360, 2ff3b5775fed3d527bfbbeea786787fe
+0,         26,         26,        1,     9360, 42024dbe23d3fb5b0d8987ae1ce390a8
+0,         27,         27,        1,     9360, d804204f0bd9db5f6a758e2c934d9e38
+0,         28,         28,        1,     9360, e322712e6e34c58ec1a2ab5e2c1e3bfe
+0,         29,         29,        1,     9360, 3975bd1a5f6a6b6260276777f9de611e
+0,         30,         30,        1,     9360, 4388f0412efc6310706a7cdedc859ea9
+0,         31,         31,        1,     9360, b4b9a11b0b86635267345a569640e8d4
+0,         32,         32,        1,     9360, 31879c7b8d6b67a4209ffde786bb8cb4
+0,         33,         33,        1,     9360, 4b6dc02d7c889fe4abd4e013b25f585a
+0,         34,         34,        1,     9360, dc73aae82bd39a1220d1106c8d3e8252
+0,         35,         35,        1,     9360, 54c7dfbd49f312806f6c1a89f7c2c36f
+0,         36,         36,        1,     9360, 150abc64f8994d444a521ea90570443c
+0,         37,         37,        1,     9360, d277cdc7dcadbe0016f2e950459e7ebf
+0,         38,         38,        1,     9360, 2196bf338ead90ea54687b85c73c8229
+0,         39,         39,        1,     9360, 53ce5da5365abc0bd3217dd98e7c465d
+0,         40,         40,        1,     9360, 34ee9832aea55c0c4e6f4381c413c10e
+0,         41,         41,        1,     9360, 1769c7b5849e4681119067a06ac29a4f
+0,         42,         42,        1,     9360, 71f53df739ef283a5184c91ef4b158e8
+0,         43,         43,        1,     9360, d2d394739e9a59c06f0354c16843cb63
+0,         44,         44,        1,     9360, d8e458e92ae29344505a24a3059fc584
+0,         45,         45,        1,     9360, 0f1b11a09911851b798df2ef76253a7f
+0,         46,         46,        1,     9360, 5c4a9f22baecf4e749c0d5c65a4f1007
+0,         47,         47,        1,     9360, 3e2b7e7262fdca08d9d1ef6070125c4b
diff --git a/tests/ref/fate/mov-tenc-only-encrypted b/tests/ref/fate/mov-tenc-only-encrypted
new file mode 100644
index 0000000000..1d57aa6a80
--- /dev/null
+++ b/tests/ref/fate/mov-tenc-only-encrypted
@@ -0,0 +1,57 @@
+#format: frame checksums
+#version: 2
+#hash: MD5
+#tb 0: 1/24
+#media_type 0: video
+#codec_id 0: rawvideo
+#dimensions 0: 1024x436
+#sar 0: 1/1
+#stream#, dts,        pts, duration,     size, hash
+0,          0,          0,        1,   669696, f48f296a85eda5ba069dc851a3228bef
+0,          1,          1,        1,   669696, a50c5f69bfa3387d49b5bdf738e6529c
+0,          2,          2,        1,   669696, 05061299003760f6a4795b408f72aa31
+0,          3,          3,        1,   669696, 2572119f0b0cdd83f8a7e06252cecd3b
+0,          4,          4,        1,   669696, 29fe6a6bdb4a69018e318886a297f07e
+0,          5,          5,        1,   669696, e8233c7fbaecfbff965c7dfdd3982b1b
+0,          6,          6,        1,   669696, d9259df9880ff5d4a4b38282e67f407b
+0,          7,          7,        1,   669696, 3e8d795195038993503ea9ab6984c915
+0,          8,          8,        1,   669696, bc4e2d253b715a34f85aae1b080e3460
+0,          9,          9,        1,   669696, 09aba8b3a96f53f9268e7420a10bfab6
+0,         10,         10,        1,   669696, 179447977dd580da8b35fb5310a809ca
+0,         11,         11,        1,   669696, 7a0eea9d54577990345f5705ab9882be
+0,         12,         12,        1,   669696, 5bb96eb76f461825740e5938456df759
+0,         13,         13,        1,   669696, bd4ac4a760ead774b9422a27dc071964
+0,         14,         14,        1,   669696, 1cc05f760a9b751fc89e77f2bcc97259
+0,         15,         15,        1,   669696, 825d0dee6f0174ba7102892c7de30b4d
+0,         16,         16,        1,   669696, d26a2ef5267f6bb03c4e1d8514eee0df
+0,         17,         17,        1,   669696, c916ffdeadca76596a8f7fd47914b5ef
+0,         18,         18,        1,   669696, 6e085acfa7fee0658ea0ae6188274c17
+0,         19,         19,        1,   669696, 1e95fa5b3561283f05bf0bd44cb91721
+0,         20,         20,        1,   669696, 37e3d135aba9dfb8b87e441753115374
+0,         21,         21,        1,   669696, 9c398310e8564491de624393c16265ce
+0,         22,         22,        1,   669696, c87209e4d2617bc2ab40a75f455f09da
+0,         23,         23,        1,   669696, 2679c2f8d1d1af21982e245945c1ee60
+0,         24,         24,        1,   669696, 6151ab4781f31c5beb66b356ad547122
+0,         25,         25,        1,   669696, f7ef6293bfb3a6a329061cb6a5ed5a38
+0,         26,         26,        1,   669696, 2f6e666d14dfc407ca0c0f347b13eb08
+0,         27,         27,        1,   669696, 3454fa1730d79b1aa8dbbc865dc150f4
+0,         28,         28,        1,   669696, e93dc683e2453419a0419ab9af0f8f95
+0,         29,         29,        1,   669696, 031eb3154f7f83cf86d42bee66be9cf7
+0,         30,         30,        1,   669696, 1205c36723e88811206c68892d3aaed6
+0,         31,         31,        1,   669696, 7dd7a8a19dcd73b31ddc6a6d0c597a42
+0,         32,         32,        1,   669696, 7c91115368ea2531262a1197468bc3f4
+0,         33,         33,        1,   669696, 3cf6d9ba385e0fff76da33299ed5380c
+0,         34,         34,        1,   669696, 859fc8c3ef049e3c1175a85fb0a90a3d
+0,         35,         35,        1,   669696, 1d09ce6c7027103d99a4d5799f6e72ab
+0,         36,         36,        1,   669696, 3dcb8357408ac88abd734128d8f5dd6f
+0,         37,         37,        1,   669696, 4dafce137a0a5178f6efaec878e64d36
+0,         38,         38,        1,   669696, 44c478f29a1399ed03275a7357f57d48
+0,         39,         39,        1,   669696, 6e9edaac7414c0e14591ac3d4d0b1ac4
+0,         40,         40,        1,   669696, 522e4aaeea0825da27f631a9e690d654
+0,         41,         41,        1,   669696, 85f2502a718440834c40051d30f8a65e
+0,         42,         42,        1,   669696, ae8816f7bd4645ef1a17ee6d09b4c8d2
+0,         43,         43,        1,   669696, 914b006fa92f1eb3e590245749f6810d
+0,         44,         44,        1,   669696, 9406901542e94c429dff46108782ed69
+0,         45,         45,        1,   669696, 324c13641c39eef5c476023e358c0391
+0,         46,         46,        1,   669696, 4058e886e17c22e4eb9da1dd0d6ad891
+0,         47,         47,        1,   669696, 9edf9cd15eea985b42fd1f5035b1d693