switch (m4ac->object_type) {
case AOT_AAC_MAIN:
case AOT_AAC_LC:
+ case AOT_AAC_SSR:
case AOT_AAC_LTP:
case AOT_ER_AAC_LC:
case AOT_ER_AAC_LD:
reset_all_predictors(sce->predictor_state);
}
+static void decode_gain_control(SingleChannelElement * sce, GetBitContext * gb)
+{
+ // wd_num, wd_test, aloc_size
+ static const uint8_t gain_mode[4][3] = {
+ {1, 0, 5}, // ONLY_LONG_SEQUENCE = 0,
+ {2, 1, 2}, // LONG_START_SEQUENCE,
+ {8, 0, 2}, // EIGHT_SHORT_SEQUENCE,
+ {2, 1, 5}, // LONG_STOP_SEQUENCE
+ };
+
+ const int mode = sce->ics.window_sequence[0];
+ uint8_t bd, wd, ad;
+
+ // FIXME: Store the gain control data on |sce| and do something with it.
+ uint8_t max_band = get_bits(gb, 2);
+ for (bd = 0; bd < max_band; bd++) {
+ for (wd = 0; wd < gain_mode[mode][0]; wd++) {
+ uint8_t adjust_num = get_bits(gb, 3);
+ for (ad = 0; ad < adjust_num; ad++) {
+ skip_bits(gb, 4 + ((wd == 0 && gain_mode[mode][1])
+ ? 4
+ : gain_mode[mode][2]));
+ }
+ }
+ }
+}
+
/**
* Decode an individual_channel_stream payload; reference: table 4.44.
*
goto fail;
}
if (!eld_syntax && get_bits1(gb)) {
- avpriv_request_sample(ac->avctx, "SSR");
- ret = AVERROR_PATCHWELCOME;
- goto fail;
+ decode_gain_control(sce, gb);
+ if (!ac->warned_gain_control) {
+ avpriv_report_missing_feature(ac->avctx, "Gain control");
+ ac->warned_gain_control = 1;
+ }
}
// I see no textual basis in the spec for this occurring after SSR gain
// control, but this is what both reference and real implmentations do