[FFmpeg-devel] crypto support

From 805886e76fe7123cd633ab564c7fc8cf932aba3a Mon Sep 17 00:00:00 2001
From: Evgeny <kea@obninsk.ru>
Date: Fri, 16 Nov 2018 12:39:32 +0300
Subject: [PATCH 4/6] Application should have read PSSH data for license
 request

Example:
for (int i=0; i < ctx->nb_streams; i++) {
  AVStream* avs = ctx->streams[i];
  if (avs->nb_side_data) {
    AVPacketSideData* sd = avs->side_data;
    if (sd->type == AV_PKT_DATA_ENCRYPTION_INIT_INFO) {
     licenseRequest(sd->data, sd->size);
     break;
  }
}
TODO: out of band PSSH (from manifest)
---
 libavformat/dashdec.c | 19 +++++++++++++++++++
 libavformat/hls.c     | 25 ++++++++++++++++++++++---
 2 files changed, 41 insertions(+), 3 deletions(-)

diff --git a/libavformat/dashdec.c b/libavformat/dashdec.c
index 497e7e4..9a984aa 100644
--- a/libavformat/dashdec.c
+++ b/libavformat/dashdec.c
@@ -1906,6 +1906,25 @@  static int open_demux_for_component(AVFormatContext *s, struct representation *p
         st->id = i;
         avcodec_parameters_copy(st->codecpar, pls->ctx->streams[i]->codecpar);
         avpriv_set_pts_info(st, ist->pts_wrap_bits, ist->time_base.num, ist->time_base.den);
+
+		/* Copy side data if present */
+		if (ist->nb_side_data) {
+			st->side_data = av_mallocz_array(ist->nb_side_data,
+											  sizeof(AVPacketSideData));
+			if (!st->side_data)
+				return AVERROR(ENOMEM);
+			st->nb_side_data = ist->nb_side_data;
+
+			for (int i = 0; i < ist->nb_side_data; i++) {
+				uint8_t *data = av_memdup(ist->side_data[i].data,
+										  ist->side_data[i].size);
+				if (!data)
+					return AVERROR(ENOMEM);
+				st->side_data[i].type = ist->side_data[i].type;
+				st->side_data[i].size = ist->side_data[i].size;
+				st->side_data[i].data = data;
+			}
+		}
     }
 
     return 0;
diff --git a/libavformat/hls.c b/libavformat/hls.c
index 8ad08ba..fc08a69 100644
--- a/libavformat/hls.c
+++ b/libavformat/hls.c
@@ -1229,9 +1229,9 @@  static int open_input(HLSContext *c, struct playlist *pls, struct segment *seg,
         }
         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;
+		av_strlcpy(pls->key_url, seg->key, sizeof(pls->key_url));
+		av_dict_set(&opts, "pssh", pls->key_url, 0);
+		ret = open_url(pls->parent, in, seg->url, c->avio_opts, opts, &is_http);
     }
     else
       ret = AVERROR(ENOSYS);
@@ -1737,6 +1737,25 @@  static int update_streams_from_subdemuxer(AVFormatContext *s, struct playlist *p
         err = set_stream_info_from_input_stream(st, pls, ist);
         if (err < 0)
             return err;
+
+		/* Copy side data if present */
+		if (ist->nb_side_data) {
+			st->side_data = av_mallocz_array(ist->nb_side_data,
+											  sizeof(AVPacketSideData));
+			if (!st->side_data)
+				return AVERROR(ENOMEM);
+			st->nb_side_data = ist->nb_side_data;
+
+			for (int i = 0; i < ist->nb_side_data; i++) {
+				uint8_t *data = av_memdup(ist->side_data[i].data,
+										  ist->side_data[i].size);
+				if (!data)
+					return AVERROR(ENOMEM);
+				st->side_data[i].type = ist->side_data[i].type;
+				st->side_data[i].size = ist->side_data[i].size;
+				st->side_data[i].data = data;
+			}
+		}
     }
 
     return 0;
-- 
2.1.4