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Code Issues Releases Activity

Make seeking work in files that contain encrypted tracks.

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Originally committed as revision 7502 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Reimar Döffinger 2007-01-14 21:23:32 +00:00
parent d65dc0cdc6
commit 86074ce341
1 changed files with 12 additions and 1 deletions
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13
libavformat/mxf.c
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@ -141,6 +141,7 @@ typedef struct MXFContext {
UID content_storage_uid;
MXFMetadataSet **metadata_sets;
int metadata_sets_count;
uint8_t *sync_key;
AVFormatContext *fc;
} MXFContext;
@ -174,6 +175,8 @@ typedef struct MXFMetadataReadTableEntry {
/* partial keys to match */
static const uint8_t mxf_header_partition_pack_key[] = { 0x06,0x0e,0x2b,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02 };
static const uint8_t mxf_essence_element_key[] = { 0x06,0x0e,0x2b,0x34,0x01,0x02,0x01,0x01,0x0d,0x01,0x03,0x01 };
/* complete keys to match */
static const uint8_t mxf_encrypted_triplet_key[] = { 0x06,0x0e,0x2b,0x34,0x02,0x04,0x01,0x07,0x0d,0x01,0x03,0x01,0x02,0x7e,0x01,0x00 };
#define IS_KLV_KEY(x, y) (!memcmp(x, y, sizeof(y)))
@ -248,6 +251,7 @@ static int mxf_get_d10_aes3_packet(ByteIOContext *pb, AVStream *st, AVPacket *pk
static int mxf_read_packet(AVFormatContext *s, AVPacket *pkt)
{
MXFContext *mxf = s->priv_data;
KLVPacket klv;
while (!url_feof(&s->pb)) {
@ -258,6 +262,11 @@ static int mxf_read_packet(AVFormatContext *s, AVPacket *pkt)
#ifdef DEBUG
PRINT_KEY("read packet", klv.key);
#endif
if (IS_KLV_KEY(klv.key, mxf_encrypted_triplet_key)) {
mxf->sync_key = mxf_encrypted_triplet_key;
av_log(s, AV_LOG_ERROR, "encrypted triplet not supported\n");
return -1;
}
if (IS_KLV_KEY(klv.key, mxf_essence_element_key)) {
int index = mxf_get_stream_index(s, &klv);
if (index < 0) {
@ -856,6 +865,7 @@ static int mxf_read_header(AVFormatContext *s, AVFormatParameters *ap)
MXFContext *mxf = s->priv_data;
KLVPacket klv;
mxf->sync_key = mxf_essence_element_key;
if (!mxf_read_sync(&s->pb, mxf_header_partition_pack_key, 14)) {
av_log(s, AV_LOG_ERROR, "could not find header partition pack key\n");
return -1;
@ -942,6 +952,7 @@ static int mxf_probe(AVProbeData *p) {
/* XXX: use MXF Index */
static int mxf_read_seek(AVFormatContext *s, int stream_index, int64_t sample_time, int flags)
{
MXFContext *mxf = s->priv_data;
AVStream *st = s->streams[stream_index];
int64_t seconds;
@ -951,7 +962,7 @@ static int mxf_read_seek(AVFormatContext *s, int stream_index, int64_t sample_ti
sample_time = 0;
seconds = av_rescale(sample_time, st->time_base.num, st->time_base.den);
url_fseek(&s->pb, (s->bit_rate * seconds) >> 3, SEEK_SET);
if (!mxf_read_sync(&s->pb, mxf_essence_element_key, 12))
if (!mxf_read_sync(&s->pb, mxf->sync_key, 12))
return -1;
/* found KLV key */