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m3u8: Split gst_m3u8_update_check_consistent_media_seqnums
The function was basically one big if-else. Move the branch to the one caller. Currently, it's never called with previous_files == NULL. Assert that this continues. https://bugzilla.gnome.org/show_bug.cgi?id=788417
This commit is contained in:
Jan Alexander Steffens (heftig)
Sebastian Dröge
parent
234a8ecc50
commit
f80ad048e6
1 changed files with 122 additions and 115 deletions
237
ext/hls/m3u8.c
237
ext/hls/m3u8.c
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@ -306,138 +306,140 @@ gst_hls_variant_stream_compare_by_bitrate (gconstpointer a, gconstpointer b)
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return vs_a->bandwidth - vs_b->bandwidth;
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}
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/* If we have MEDIA-SEQUENCE, ensure that it's consistent. If it is not,
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* the client SHOULD halt playback (6.3.4), which is what we do then. */
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static gboolean
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gst_m3u8_update_check_consistent_media_seqnums (GstM3U8 * self,
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gboolean have_mediasequence, GList * previous_files)
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check_media_seqnums (GstM3U8 * self, GList * previous_files)
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{
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if (!previous_files)
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return TRUE;
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GList *l, *m;
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GstM3U8MediaFile *f1 = NULL, *f2 = NULL;
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/* If we have MEDIA-SEQUENCE, ensure that it's consistent. If it is not,
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* the client SHOULD halt playback (6.3.4), which is what we do then.
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*
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* If we don't have MEDIA-SEQUENCE, we check URIs in the previous and
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* current playlist to calculate the/a correct MEDIA-SEQUENCE for the new
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* playlist in relation to the old. That is, same URIs get the same number
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* and later URIs get higher numbers */
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if (have_mediasequence) {
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GList *l, *m;
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GstM3U8MediaFile *f1 = NULL, *f2 = NULL;
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g_return_val_if_fail (previous_files, FALSE);
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/* Find first case of higher/equal sequence number in new playlist or
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* same URI. From there on we can linearly step ahead */
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for (l = self->files; l; l = l->next) {
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gboolean match = FALSE;
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/* Find first case of higher/equal sequence number in new playlist or
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* same URI. From there on we can linearly step ahead */
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for (l = self->files; l; l = l->next) {
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gboolean match = FALSE;
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f1 = l->data;
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for (m = previous_files; m; m = m->next) {
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f2 = m->data;
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f1 = l->data;
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for (m = previous_files; m; m = m->next) {
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f2 = m->data;
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if (f1->sequence >= f2->sequence || g_str_equal (f1->uri, f2->uri)) {
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match = TRUE;
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break;
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}
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}
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if (match)
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if (f1->sequence >= f2->sequence || g_str_equal (f1->uri, f2->uri)) {
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match = TRUE;
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break;
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}
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}
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if (match)
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break;
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}
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if (!l) {
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/* No match, no sequence in the new playlist was higher than
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* any in the old, and no URI was found again. This is bad! */
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if (!l) {
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/* No match, no sequence in the new playlist was higher than
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* any in the old, and no URI was found again. This is bad! */
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GST_ERROR ("Media sequences inconsistent, ignoring");
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return FALSE;
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}
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g_assert (f1 != NULL);
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g_assert (f2 != NULL);
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for (; l && m; l = l->next, m = m->next) {
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f1 = l->data;
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f2 = m->data;
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if (f1->sequence == f2->sequence) {
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if (!g_str_equal (f1->uri, f2->uri)) {
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/* Same sequence, different URI. This is bad! */
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GST_ERROR ("Media sequences inconsistent, ignoring");
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return FALSE;
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} else {
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/* Good case, we advance and check the next one */
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}
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} else if (g_str_equal (f1->uri, f2->uri)) {
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/* Same URIs but different sequences, this is bad! */
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GST_ERROR ("Media sequences inconsistent, ignoring");
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return FALSE;
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} else {
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g_assert (f1 != NULL);
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g_assert (f2 != NULL);
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for (; l && m; l = l->next, m = m->next) {
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f1 = l->data;
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f2 = m->data;
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if (f1->sequence == f2->sequence) {
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if (!g_str_equal (f1->uri, f2->uri)) {
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/* Same sequence, different URI. This is bad! */
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GST_ERROR ("Media sequences inconsistent, ignoring");
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return FALSE;
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} else {
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/* Good case, we advance and check the next one */
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}
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} else if (g_str_equal (f1->uri, f2->uri)) {
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/* Same URIs but different sequences, this is bad! */
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GST_ERROR ("Media sequences inconsistent, ignoring");
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return FALSE;
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} else {
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/* Not same URI, not same sequence but by construction sequence
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* must be higher in the new one. All good in that case, if it
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* isn't then this means that sequence numbers are decreasing
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* or files were inserted */
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if (f1->sequence < f2->sequence) {
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GST_ERROR ("Media sequences inconsistent, ignoring");
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return FALSE;
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}
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}
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/* Not same URI, not same sequence but by construction sequence
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* must be higher in the new one. All good in that case, if it
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* isn't then this means that sequence numbers are decreasing
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* or files were inserted */
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if (f1->sequence < f2->sequence) {
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GST_ERROR ("Media sequences inconsistent, ignoring");
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return FALSE;
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}
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/* All good if we're getting here */
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}
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} else {
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GList *l, *m;
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GstM3U8MediaFile *f1 = NULL, *f2 = NULL;
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gint64 mediasequence;
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for (l = self->files; l; l = l->next) {
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gboolean match = FALSE;
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f1 = l->data;
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for (m = previous_files; m; m = m->next) {
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f2 = m->data;
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if (g_str_equal (f1->uri, f2->uri)) {
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match = TRUE;
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break;
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}
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}
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if (match)
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break;
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}
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if (!l) {
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/* No match, this means f2 is the last item in the previous playlist
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* and we have to start our new playlist at that sequence */
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mediasequence = f2->sequence + 1;
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l = self->files;
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} else {
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/* Match, check that all following ones are matching too and continue
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* sequence numbers from there on */
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mediasequence = f2->sequence;
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for (; l && m; l = l->next, m = m->next) {
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f1 = l->data;
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f2 = m->data;
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f1->sequence = mediasequence;
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mediasequence++;
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if (!g_str_equal (f1->uri, f2->uri)) {
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GST_WARNING ("Inconsistent URIs after playlist update");
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}
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}
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}
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for (; l; l = l->next) {
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f1 = l->data;
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f1->sequence = mediasequence;
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mediasequence++;
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}
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}
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/* All good if we're getting here */
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return TRUE;
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}
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/* If we don't have MEDIA-SEQUENCE, we check URIs in the previous and
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* current playlist to calculate the/a correct MEDIA-SEQUENCE for the new
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* playlist in relation to the old. That is, same URIs get the same number
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* and later URIs get higher numbers */
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static void
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generate_media_seqnums (GstM3U8 * self, GList * previous_files)
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{
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GList *l, *m;
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GstM3U8MediaFile *f1 = NULL, *f2 = NULL;
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gint64 mediasequence;
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g_return_if_fail (previous_files);
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/* Find first case of same URI in new playlist.
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* From there on we can linearly step ahead */
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for (l = self->files; l; l = l->next) {
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gboolean match = FALSE;
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f1 = l->data;
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for (m = previous_files; m; m = m->next) {
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f2 = m->data;
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if (g_str_equal (f1->uri, f2->uri)) {
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match = TRUE;
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break;
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}
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}
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if (match)
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break;
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}
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if (l) {
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/* Match, check that all following ones are matching too and continue
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* sequence numbers from there on */
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mediasequence = f2->sequence;
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for (; l && m; l = l->next, m = m->next) {
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f1 = l->data;
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f2 = m->data;
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f1->sequence = mediasequence;
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mediasequence++;
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if (!g_str_equal (f1->uri, f2->uri)) {
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GST_WARNING ("Inconsistent URIs after playlist update");
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}
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}
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} else {
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/* No match, this means f2 is the last item in the previous playlist
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* and we have to start our new playlist at that sequence */
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mediasequence = f2->sequence + 1;
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l = self->files;
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}
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for (; l; l = l->next) {
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f1 = l->data;
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f1->sequence = mediasequence;
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mediasequence++;
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}
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}
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/*
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* @data: a m3u8 playlist text data, taking ownership
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*/
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@ -688,8 +690,13 @@ gst_m3u8_update (GstM3U8 * self, gchar * data)
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self->files = g_list_reverse (self->files);
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if (previous_files) {
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gboolean consistent = gst_m3u8_update_check_consistent_media_seqnums (self,
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have_mediasequence, previous_files);
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gboolean consistent = TRUE;
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if (have_mediasequence) {
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consistent = check_media_seqnums (self, previous_files);
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} else {
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generate_media_seqnums (self, previous_files);
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}
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g_list_foreach (previous_files, (GFunc) gst_m3u8_media_file_unref, NULL);
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g_list_free (previous_files);
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