fix(: resolve hls seek due to ffmpeg patch

Author: cxfksword

Sources/BuildScripts/patch/FFmpeg/0001-hls-seek-patch-1.patch

@@ -0,0 +1,39 @@
+From 0c14ac8d5f19f22f31ae9505e3db5eb417e8d6e0 Mon Sep 17 00:00:00 2001
+From: llyyr <llyyr.public@gmail.com>
+Date: Sun, 27 Oct 2024 06:52:42 +0530
+Subject: [PATCH 1/2] avformat/hls: always return keyframe if not
+ AVSEEK_FLAG_ANY
+
+Co-Authored-by: vectronic <hello.vectronic@gmail.com>
+---
+ libavformat/hls.c | 8 +++++---
+ 1 file changed, 5 insertions(+), 3 deletions(-)
+
+diff --git a/libavformat/hls.c b/libavformat/hls.c
+index 62473a15ddb5..4d02faa9e49a 100644
+--- a/libavformat/hls.c
++++ b/libavformat/hls.c
+@@ -2350,8 +2350,10 @@ static int hls_read_packet(AVFormatContext *s, AVPacket *pkt)
+                     ts_diff = av_rescale_rnd(pls->pkt->dts, AV_TIME_BASE,
+                                             tb.den, AV_ROUND_DOWN) -
+                             pls->seek_timestamp;
+-                    if (ts_diff >= 0 && (pls->seek_flags  & AVSEEK_FLAG_ANY ||
+-                                        pls->pkt->flags & AV_PKT_FLAG_KEY)) {
++                    /* If AVSEEK_FLAG_ANY, keep reading until ts_diff >= 0,
++                     * otherwise return the first keyframe encountered */
++                    if ((ts_diff >= 0 && (pls->seek_flags & AVSEEK_FLAG_ANY)) ||
++                        (!(pls->seek_flags & AVSEEK_FLAG_ANY) && (pls->pkt->flags & AV_PKT_FLAG_KEY)))  {
+                         pls->seek_timestamp = AV_NOPTS_VALUE;
+                         break;
+                     }
+@@ -2502,7 +2504,7 @@ static int hls_read_seek(AVFormatContext *s, int stream_index,
+         pb->eof_reached = 0;
+         /* Clear any buffered data */
+         pb->buf_end = pb->buf_ptr = pb->buffer;
+-        /* Reset the pos, to let the mpegts demuxer know we've seeked. */
++        /* Reset the pos, to let the mpegts/mov demuxer know we've seeked. */
+         pb->pos = 0;
+         /* Flush the packet queue of the subdemuxer. */
+         ff_read_frame_flush(pls->ctx);
+-- 
+2.47.0

Sources/BuildScripts/patch/FFmpeg/0002-hls-seek-patch-2.patch.cpp

@@ -0,0 +1,78 @@
+From 07045b8245cfc5822005c716db8a84b710579787 Mon Sep 17 00:00:00 2001
+From: llyyr <llyyr.public@gmail.com>
+Date: Sun, 27 Oct 2024 06:44:51 +0530
+Subject: [PATCH 2/2] avformat/mov: handle stream position resets
+
+If the stream position has been reset, clear fragment index, the index
+entries and the current sample and search for the next root.
+
+Co-Authored-by: vectronic <hello.vectronic@gmail.com>
+---
+ libavformat/mov.c | 37 +++++++++++++++++++++++++++++++++----
+ 1 file changed, 33 insertions(+), 4 deletions(-)
+
+diff --git a/libavformat/mov.c b/libavformat/mov.c
+index 8c3329b81596..78540bec1d11 100644
+--- a/libavformat/mov.c
++++ b/libavformat/mov.c
+@@ -10612,15 +10612,15 @@ static int mov_switch_root(AVFormatContext *s, int64_t target, int index)
+ 
+     if (index >= 0 && index < mov->frag_index.nb_items)
+         target = mov->frag_index.item[index].moof_offset;
+-    if (avio_seek(s->pb, target, SEEK_SET) != target) {
++    if (target >= 0 && avio_seek(s->pb, target, SEEK_SET) != target) {
+         av_log(mov->fc, AV_LOG_ERROR, "root atom offset 0x%"PRIx64": partial file\n", target);
+         return AVERROR_INVALIDDATA;
+     }
+ 
+     mov->next_root_atom = 0;
+-    if (index < 0 || index >= mov->frag_index.nb_items)
++    if ((index < 0 && target >= 0) || index >= mov->frag_index.nb_items)
+         index = search_frag_moof_offset(&mov->frag_index, target);
+-    if (index < mov->frag_index.nb_items &&
++    if (index >= 0 && index < mov->frag_index.nb_items &&
+         mov->frag_index.item[index].moof_offset == target) {
+         if (index + 1 < mov->frag_index.nb_items)
+             mov->next_root_atom = mov->frag_index.item[index + 1].moof_offset;
+@@ -10751,9 +10751,38 @@ static int mov_read_packet(AVFormatContext *s, AVPacket *pkt)
+     AVIndexEntry *sample;
+     AVStream *st = NULL;
+     int64_t current_index;
+-    int ret;
++    int ret, i;
+     mov->fc = s;
+  retry:
++    if (s->pb->pos == 0) {
++        // Discard current fragment index
++        if (mov->frag_index.allocated_size > 0) {
++            av_freep(&mov->frag_index.item);
++            mov->frag_index.nb_items = 0;
++            mov->frag_index.allocated_size = 0;
++            mov->frag_index.current = -1;
++            mov->frag_index.complete = 0;
++        }
++
++        for (i = 0; i < s->nb_streams; i++) {
++            AVStream *avst = s->streams[i];
++            FFStream *sti = ffstream(avst);
++            MOVStreamContext *msc = avst->priv_data;
++
++            // Clear current sample
++            mov_current_sample_set(msc, 0);
++
++            // Discard current index entries
++            if (sti->index_entries_allocated_size > 0) {
++                av_freep(&sti->index_entries);
++                sti->index_entries_allocated_size = 0;
++                sti->nb_index_entries = 0;
++            }
++        }
++
++        if ((ret = mov_switch_root(s, -1, -1)) < 0)
++            return ret;
++    }
+     sample = mov_find_next_sample(s, &st);
+     if (!sample || (mov->next_root_atom && sample->pos > mov->next_root_atom)) {
+         if (!mov->next_root_atom)
+-- 
+2.47.0