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Add convenience methods to select multiple audio or text tracks for downloading.

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These methods take a list of languages to be downloaded and add selections for
each of the languages.

PiperOrigin-RevId: 231385632
This commit is contained in:
tonihei 2019-01-29 12:59:04 +00:00 committed by Oliver Woodman
parent 71d77d7fa0
commit 6983f92ffd
2 changed files with 125 additions and 0 deletions
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58
library/core/src/main/java/com/google/android/exoplayer2/offline/DownloadHelper.java
View file

@ -489,6 +489,64 @@ public final class DownloadHelper {
runTrackSelection(periodIndex);
}
/**
* Convenience method to add selections of tracks for all specified audio languages. If an audio
* track in one of the specified languages is not available, the default fallback audio track is
* used instead. Must not be called until after preparation completes.
*
* @param languages A list of audio languages for which tracks should be added to the download
* selection, as ISO 639-2/T tags.
*/
public void addAudioLanguagesToSelection(String... languages) {
assertPreparedWithMedia();
for (int periodIndex = 0; periodIndex < mappedTrackInfos.length; periodIndex++) {
DefaultTrackSelector.ParametersBuilder parametersBuilder =
DEFAULT_TRACK_SELECTOR_PARAMETERS.buildUpon();
MappedTrackInfo mappedTrackInfo = mappedTrackInfos[periodIndex];
int rendererCount = mappedTrackInfo.getRendererCount();
for (int rendererIndex = 0; rendererIndex < rendererCount; rendererIndex++) {
if (mappedTrackInfo.getRendererType(rendererIndex) != C.TRACK_TYPE_AUDIO) {
parametersBuilder.setRendererDisabled(rendererIndex, /* disabled= */ true);
}
}
for (String language : languages) {
parametersBuilder.setPreferredAudioLanguage(language);
addTrackSelection(periodIndex, parametersBuilder.build());
}
}
}
/**
* Convenience method to add selections of tracks for all specified text languages. Must not be
* called until after preparation completes.
*
* @param selectUndeterminedTextLanguage Whether a text track with undetermined language should be
* selected for downloading if no track with one of the specified {@code languages} is
* available.
* @param languages A list of text languages for which tracks should be added to the download
* selection, as ISO 639-2/T tags.
*/
public void addTextLanguagesToSelection(
boolean selectUndeterminedTextLanguage, String... languages) {
assertPreparedWithMedia();
for (int periodIndex = 0; periodIndex < mappedTrackInfos.length; periodIndex++) {
DefaultTrackSelector.ParametersBuilder parametersBuilder =
DEFAULT_TRACK_SELECTOR_PARAMETERS.buildUpon();
MappedTrackInfo mappedTrackInfo = mappedTrackInfos[periodIndex];
int rendererCount = mappedTrackInfo.getRendererCount();
for (int rendererIndex = 0; rendererIndex < rendererCount; rendererIndex++) {
if (mappedTrackInfo.getRendererType(rendererIndex) != C.TRACK_TYPE_TEXT) {
parametersBuilder.setRendererDisabled(rendererIndex, /* disabled= */ true);
}
}
parametersBuilder.setSelectUndeterminedTextLanguage(selectUndeterminedTextLanguage);
for (String language : languages) {
parametersBuilder.setPreferredTextLanguage(language);
addTrackSelection(periodIndex, parametersBuilder.build());
}
}
}
/**
* Builds a {@link DownloadAction} for downloading the selected tracks. Must not be called until
* after preparation completes.

67
library/core/src/test/java/com/google/android/exoplayer2/offline/DownloadHelperTest.java
View file

@ -312,6 +312,73 @@ public class DownloadHelperTest {
assertSingleTrackSelectionEquals(selectedVideo1, TRACK_GROUP_VIDEO_SINGLE, 0);
}
@Test
public void getTrackSelections_afterAddAudioLanguagesToSelection_returnsCombinedSelections()
throws Exception {
prepareDownloadHelper(downloadHelper);
downloadHelper.clearTrackSelections(/* periodIndex= */ 0);
downloadHelper.clearTrackSelections(/* periodIndex= */ 1);
// Add a non-default language, and a non-existing language (which will select the default).
downloadHelper.addAudioLanguagesToSelection("ZH", "Klingonese");
List<TrackSelection> selectedText0 =
downloadHelper.getTrackSelections(/* periodIndex= */ 0, /* rendererIndex= */ 0);
List<TrackSelection> selectedAudio0 =
downloadHelper.getTrackSelections(/* periodIndex= */ 0, /* rendererIndex= */ 1);
List<TrackSelection> selectedVideo0 =
downloadHelper.getTrackSelections(/* periodIndex= */ 0, /* rendererIndex= */ 2);
List<TrackSelection> selectedText1 =
downloadHelper.getTrackSelections(/* periodIndex= */ 1, /* rendererIndex= */ 0);
List<TrackSelection> selectedAudio1 =
downloadHelper.getTrackSelections(/* periodIndex= */ 1, /* rendererIndex= */ 1);
List<TrackSelection> selectedVideo1 =
downloadHelper.getTrackSelections(/* periodIndex= */ 1, /* rendererIndex= */ 2);
assertThat(selectedVideo0).isEmpty();
assertThat(selectedText0).isEmpty();
assertThat(selectedAudio0).hasSize(2);
assertTrackSelectionEquals(selectedAudio0.get(0), TRACK_GROUP_AUDIO_ZH, 0);
assertTrackSelectionEquals(selectedAudio0.get(1), TRACK_GROUP_AUDIO_US, 0);
assertThat(selectedVideo1).isEmpty();
assertThat(selectedText1).isEmpty();
assertSingleTrackSelectionEquals(selectedAudio1, TRACK_GROUP_AUDIO_US, 0);
}
@Test
public void getTrackSelections_afterAddTextLanguagesToSelection_returnsCombinedSelections()
throws Exception {
prepareDownloadHelper(downloadHelper);
downloadHelper.clearTrackSelections(/* periodIndex= */ 0);
downloadHelper.clearTrackSelections(/* periodIndex= */ 1);
// Add a non-default language, and a non-existing language (which will select the default).
downloadHelper.addTextLanguagesToSelection(
/* selectUndeterminedTextLanguage= */ true, "ZH", "Klingonese");
List<TrackSelection> selectedText0 =
downloadHelper.getTrackSelections(/* periodIndex= */ 0, /* rendererIndex= */ 0);
List<TrackSelection> selectedAudio0 =
downloadHelper.getTrackSelections(/* periodIndex= */ 0, /* rendererIndex= */ 1);
List<TrackSelection> selectedVideo0 =
downloadHelper.getTrackSelections(/* periodIndex= */ 0, /* rendererIndex= */ 2);
List<TrackSelection> selectedText1 =
downloadHelper.getTrackSelections(/* periodIndex= */ 1, /* rendererIndex= */ 0);
List<TrackSelection> selectedAudio1 =
downloadHelper.getTrackSelections(/* periodIndex= */ 1, /* rendererIndex= */ 1);
List<TrackSelection> selectedVideo1 =
downloadHelper.getTrackSelections(/* periodIndex= */ 1, /* rendererIndex= */ 2);
assertThat(selectedVideo0).isEmpty();
assertThat(selectedAudio0).isEmpty();
assertThat(selectedText0).hasSize(2);
assertTrackSelectionEquals(selectedText0.get(0), TRACK_GROUP_TEXT_ZH, 0);
assertTrackSelectionEquals(selectedText0.get(1), TRACK_GROUP_TEXT_US, 0);
assertThat(selectedVideo1).isEmpty();
assertThat(selectedAudio1).isEmpty();
assertThat(selectedText1).isEmpty();
}
@Test
public void getDownloadAction_createsDownloadAction_withAllSelectedTracks() throws Exception {
prepareDownloadHelper(downloadHelper);