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deps/media-playback: Fix lockup issues

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Certain functions such as avformat_open_input and av_read_frame can
block, causing the program to someone wait very long periods of time
when a network URL is used with the media source.  The
interrupt_callback member variable in AVFormatContext allows safely
canceling IO operations when trying to shut down or stop the
media-playback interface.
This commit is contained in:
jp9000 2017-06-04 00:38:29 -07:00
parent daee6e0759
commit 88ae9aff6e
2 changed files with 24 additions and 1 deletions
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23
deps/media-playback/media-playback/media.c vendored
View file

@ -486,6 +486,23 @@ static inline bool mp_media_eof(mp_media_t *m)
return eof;
}
static int interrupt_callback(void *data)
{
mp_media_t *m = data;
bool stop = false;
uint64_t ts = os_gettime_ns();
if ((ts - m->interrupt_poll_ts) > 20000000) {
pthread_mutex_lock(&m->mutex);
stop = m->kill || m->stopping;
pthread_mutex_unlock(&m->mutex);
m->interrupt_poll_ts = ts;
}
return stop;
}
static bool init_avformat(mp_media_t *m)
{
AVInputFormat *format = NULL;
@ -501,6 +518,10 @@ static bool init_avformat(mp_media_t *m)
if (m->buffering && m->is_network)
av_dict_set_int(&opts, "buffer_size", m->buffering, 0);
m->fmt = avformat_alloc_context();
m->fmt->interrupt_callback.callback = interrupt_callback;
m->fmt->interrupt_callback.opaque = m;
int ret = avformat_open_input(&m->fmt, m->path, format,
opts ? &opts : NULL);
av_dict_free(&opts);
@ -695,9 +716,9 @@ void mp_media_free(mp_media_t *media)
mp_kill_thread(media);
mp_decode_free(&media->v);
mp_decode_free(&media->a);
avformat_close_input(&media->fmt);
pthread_mutex_destroy(&media->mutex);
os_sem_destroy(media->sem);
avformat_close_input(&media->fmt);
sws_freeContext(media->swscale);
av_freep(&media->scale_pic[0]);
bfree(media->path);

2
deps/media-playback/media-playback/media.h vendored
View file

@ -80,6 +80,8 @@ struct mp_media {
int64_t start_ts;
int64_t base_ts;
uint64_t interrupt_poll_ts;
pthread_mutex_t mutex;
os_sem_t *sem;
bool stopping;