57 #define ALAC_EXTRADATA_SIZE 36
106 int sign_modifier = 0;
113 k =
av_log2((history >> 9) + 3);
118 output_buffer[i] = (x >> 1) ^ -(x & 1);
124 history += x * rice_history_mult -
125 ((history * rice_history_mult) >> 9);
128 if ((history < 128) && (i + 1 < nb_samples)) {
132 k = 7 -
av_log2(history) + ((history + 16) >> 6);
136 if (block_size > 0) {
137 if (block_size >= nb_samples - i) {
139 "invalid zero block size of %d %d %d\n", block_size,
141 block_size = nb_samples - i - 1;
143 memset(&output_buffer[i + 1], 0,
144 block_size *
sizeof(*output_buffer));
147 if (block_size <= 0xffff)
161 int lpc_order,
int lpc_quant)
167 *buffer_out = *error_buffer;
173 memcpy(&buffer_out[1], &error_buffer[1],
174 (nb_samples - 1) *
sizeof(*buffer_out));
178 if (lpc_order == 31) {
181 buffer_out[i] =
sign_extend(buffer_out[i - 1] + error_buffer[i],
188 for (i = 1; i <= lpc_order; i++)
189 buffer_out[i] =
sign_extend(buffer_out[i - 1] + error_buffer[i], bps);
196 int error_val = error_buffer[i];
201 for (j = 0; j < lpc_order; j++)
202 val += (pred[j] - d) * lpc_coefs[j];
203 val = (val + (1 << (lpc_quant - 1))) >> lpc_quant;
204 val += d + error_val;
210 for (j = 0; j < lpc_order && error_val * error_sign > 0; j++) {
214 lpc_coefs[j] -= sign;
216 error_val -= (val >> lpc_quant) * (j + 1);
223 int decorr_shift,
int decorr_left_weight)
233 a -= (b * decorr_left_weight) >> decorr_shift;
246 for (ch = 0; ch < channels; ch++)
248 buffer[ch][i] = (buffer[ch][i] << extra_bits) | extra_bits_buffer[ch][i];
255 int has_size,
bps, is_compressed, decorr_shift, decorr_left_weight, ret;
256 uint32_t output_samples;
291 }
else if (output_samples != alac->
nb_samples) {
298 for (ch = 0; ch < channels; ch++)
303 int16_t lpc_coefs[2][32];
305 int prediction_type[2];
307 int rice_history_mult[2];
312 for (ch = 0; ch < channels; ch++) {
315 rice_history_mult[ch] =
get_bits(&alac->
gb, 3);
322 for (i = lpc_order[ch] - 1; i >= 0; i--)
328 for (ch = 0; ch < channels; ch++)
332 for (ch = 0; ch < channels; ch++) {
338 if (prediction_type[ch] == 15) {
349 }
else if (prediction_type[ch] > 0) {
351 prediction_type[ch]);
355 bps, lpc_coefs[ch], lpc_order[ch], lpc_quant[ch]);
360 for (ch = 0; ch < channels; ch++) {
367 decorr_left_weight = 0;
370 if (channels == 2 && decorr_left_weight) {
372 decorr_shift, decorr_left_weight);
382 for (ch = 0; ch < channels; ch++) {
389 for (ch = 0; ch < channels; ch++) {
400 int *got_frame_ptr,
AVPacket *avpkt)
405 int ch, ret, got_end;
423 channels = (element ==
TYPE_CPE) ? 2 : 1;
424 if (ch + channels > alac->
channels ||
476 buf_size, buf_alloc_fail);
480 buf_size, buf_alloc_fail);
484 buf_size, buf_alloc_fail);
512 alac->
rice_limit = bytestream2_get_byteu(&gb);
513 alac->
channels = bytestream2_get_byteu(&gb);
514 bytestream2_get_be16u(&gb);
515 bytestream2_get_be32u(&gb);
516 bytestream2_get_be32u(&gb);
517 bytestream2_get_be32u(&gb);