/* XXX: use same run/length optimization as mpeg decoders */
//FIXME maybe split decode / encode or pass flag
static void init_coef_vlc(VLC *vlc, uint16_t **prun_table,
- uint16_t **plevel_table, uint16_t **pint_table,
+ float **plevel_table, uint16_t **pint_table,
const CoefVLCTable *vlc_table)
{
int n = vlc_table->n;
const uint32_t *table_codes = vlc_table->huffcodes;
const uint16_t *levels_table = vlc_table->levels;
uint16_t *run_table, *level_table, *int_table;
+ float *flevel_table;
int i, l, j, k, level;
init_vlc(vlc, VLCBITS, n, table_bits, 1, 1, table_codes, 4, 4, 0);
run_table = av_malloc(n * sizeof(uint16_t));
level_table = av_malloc(n * sizeof(uint16_t));
+ flevel_table= av_malloc(n * sizeof(*flevel_table));
int_table = av_malloc(n * sizeof(uint16_t));
i = 2;
level = 1;
for (j = 0; j < l; j++) {
run_table[i] = j;
level_table[i] = level;
+ flevel_table[i]= level;
i++;
}
level++;
}
*prun_table = run_table;
- *plevel_table = level_table;
+ *plevel_table = flevel_table;
*pint_table = int_table;
+ av_free(level_table);
}
/**
for (i = 0; i < s->nb_block_sizes; i++) {
int n;
n = 1 << (s->frame_len_bits - i);
- ff_sine_window_init(ff_sine_windows[s->frame_len_bits - i - 7], n);
- s->windows[i] = ff_sine_windows[s->frame_len_bits - i - 7];
+ ff_sine_window_init(ff_sine_windows[s->frame_len_bits - i], n);
+ s->windows[i] = ff_sine_windows[s->frame_len_bits - i];
}
s->reset_block_lengths = 1;
return 0;
}
+
+/**
+ * Decode an uncompressed coefficient.
+ * @param s codec context
+ * @return the decoded coefficient
+ */
+unsigned int ff_wma_get_large_val(GetBitContext* gb)
+{
+ /** consumes up to 34 bits */
+ int n_bits = 8;
+ /** decode length */
+ if (get_bits1(gb)) {
+ n_bits += 8;
+ if (get_bits1(gb)) {
+ n_bits += 8;
+ if (get_bits1(gb)) {
+ n_bits += 7;
+ }
+ }
+ }
+ return get_bits_long(gb, n_bits);
+}
+
+/**
+ * Decode run level compressed coefficients.
+ * @param avctx codec context
+ * @param gb bitstream reader context
+ * @param vlc vlc table for get_vlc2
+ * @param level_table level codes
+ * @param run_table run codes
+ * @param version 0 for wma1,2 1 for wmapro
+ * @param ptr output buffer
+ * @param offset offset in the output buffer
+ * @param num_coefs number of input coefficents
+ * @param block_len input buffer length (2^n)
+ * @param frame_len_bits number of bits for escaped run codes
+ * @param coef_nb_bits number of bits for escaped level codes
+ * @return 0 on success, -1 otherwise
+ */
+int ff_wma_run_level_decode(AVCodecContext* avctx, GetBitContext* gb,
+ VLC *vlc,
+ const float *level_table, const uint16_t *run_table,
+ int version, WMACoef *ptr, int offset,
+ int num_coefs, int block_len, int frame_len_bits,
+ int coef_nb_bits)
+{
+ int code, level, sign;
+ const uint32_t *ilvl = (const uint32_t*)level_table;
+ uint32_t *iptr = (uint32_t*)ptr;
+ const unsigned int coef_mask = block_len - 1;
+ for (; offset < num_coefs; offset++) {
+ code = get_vlc2(gb, vlc->table, VLCBITS, VLCMAX);
+ if (code > 1) {
+ /** normal code */
+ offset += run_table[code];
+ sign = get_bits1(gb) - 1;
+ iptr[offset & coef_mask] = ilvl[code] ^ sign<<31;
+ } else if (code == 1) {
+ /** EOB */
+ break;
+ } else {
+ /** escape */
+ if (!version) {
+ level = get_bits(gb, coef_nb_bits);
+ /** NOTE: this is rather suboptimal. reading
+ block_len_bits would be better */
+ offset += get_bits(gb, frame_len_bits);
+ } else {
+ level = ff_wma_get_large_val(gb);
+ /** escape decode */
+ if (get_bits1(gb)) {
+ if (get_bits1(gb)) {
+ if (get_bits1(gb)) {
+ av_log(avctx,AV_LOG_ERROR,
+ "broken escape sequence\n");
+ return -1;
+ } else
+ offset += get_bits(gb, frame_len_bits) + 4;
+ } else
+ offset += get_bits(gb, 2) + 1;
+ }
+ }
+ sign = get_bits1(gb) - 1;
+ ptr[offset & coef_mask] = (level^sign) - sign;
+ }
+ }
+ /** NOTE: EOB can be omitted */
+ if (offset > num_coefs) {
+ av_log(avctx, AV_LOG_ERROR, "overflow in spectral RLE, ignoring\n");
+ return -1;
+ }
+
+ return 0;
+}
+