#include "unary.h"
#include "mpeg4audio.h"
#include "bytestream.h"
+#include "bgmc.h"
#include <stdint.h>
};
+/** Inter-channel weighting factors for multi-channel correlation.
+ * To be indexed by the Rice coded indices.
+ */
+static const int16_t mcc_weightings[] = {
+ 204, 192, 179, 166, 153, 140, 128, 115,
+ 102, 89, 76, 64, 51, 38, 25, 12,
+ 0, -12, -25, -38, -51, -64, -76, -89,
+ -102, -115, -128, -140, -153, -166, -179, -192
+};
+
+
+/** Tail codes used in arithmetic coding using block Gilbert-Moore codes.
+ */
+static const uint8_t tail_code[16][6] = {
+ { 74, 44, 25, 13, 7, 3},
+ { 68, 42, 24, 13, 7, 3},
+ { 58, 39, 23, 13, 7, 3},
+ {126, 70, 37, 19, 10, 5},
+ {132, 70, 37, 20, 10, 5},
+ {124, 70, 38, 20, 10, 5},
+ {120, 69, 37, 20, 11, 5},
+ {116, 67, 37, 20, 11, 5},
+ {108, 66, 36, 20, 10, 5},
+ {102, 62, 36, 20, 10, 5},
+ { 88, 58, 34, 19, 10, 5},
+ {162, 89, 49, 25, 13, 7},
+ {156, 87, 49, 26, 14, 7},
+ {150, 86, 47, 26, 14, 7},
+ {142, 84, 47, 26, 14, 7},
+ {131, 79, 46, 26, 14, 7}
+};
+
+
enum RA_Flag {
RA_FLAG_NONE,
RA_FLAG_FRAMES,
int rlslms; ///< use "Recursive Least Square-Least Mean Square" predictor: 1 = on, 0 = off
int chan_config_info; ///< mapping of channels to loudspeaker locations. Unused until setting channel configuration is implemented.
int *chan_pos; ///< original channel positions
- uint32_t header_size; ///< header size of original audio file in bytes, provided for debugging
- uint32_t trailer_size; ///< trailer size of original audio file in bytes, provided for debugging
} ALSSpecificConfig;
+typedef struct {
+ int stop_flag;
+ int master_channel;
+ int time_diff_flag;
+ int time_diff_sign;
+ int time_diff_index;
+ int weighting[6];
+} ALSChannelData;
+
+
typedef struct {
AVCodecContext *avctx;
ALSSpecificConfig sconf;
unsigned int frame_id; ///< the frame ID / number of the current frame
unsigned int js_switch; ///< if true, joint-stereo decoding is enforced
unsigned int num_blocks; ///< number of blocks used in the current frame
+ unsigned int s_max; ///< maximum Rice parameter allowed in entropy coding
+ uint8_t *bgmc_lut; ///< pointer at lookup tables used for BGMC
+ unsigned int *bgmc_lut_status; ///< pointer at lookup table status flags used for BGMC
int ltp_lag_length; ///< number of bits used for ltp lag value
int *use_ltp; ///< contains use_ltp flags for all channels
int *ltp_lag; ///< contains ltp lag values for all channels
int **ltp_gain; ///< gain values for ltp 5-tap filter for a channel
int *ltp_gain_buffer; ///< contains all gain values for ltp 5-tap filter
- int32_t *quant_cof; ///< quantized parcor coefficients
- int32_t *lpc_cof; ///< coefficients of the direct form prediction filter
+ int32_t **quant_cof; ///< quantized parcor coefficients for a channel
+ int32_t *quant_cof_buffer; ///< contains all quantized parcor coefficients
+ int32_t **lpc_cof; ///< coefficients of the direct form prediction filter for a channel
+ int32_t *lpc_cof_buffer; ///< contains all coefficients of the direct form prediction filter
+ int32_t *lpc_cof_reversed_buffer; ///< temporary buffer to set up a reversed versio of lpc_cof_buffer
+ ALSChannelData **chan_data; ///< channel data for multi-channel correlation
+ ALSChannelData *chan_data_buffer; ///< contains channel data for all channels
+ int *reverted_channels; ///< stores a flag for each reverted channel
int32_t *prev_raw_samples; ///< contains unshifted raw samples from the previous block
int32_t **raw_samples; ///< decoded raw samples for each channel
int32_t *raw_buffer; ///< contains all decoded raw samples including carryover samples
dprintf(avctx, "chan_sort = %i\n", sconf->chan_sort);
dprintf(avctx, "RLSLMS = %i\n", sconf->rlslms);
dprintf(avctx, "chan_config_info = %i\n", sconf->chan_config_info);
- dprintf(avctx, "header_size = %i\n", sconf->header_size);
- dprintf(avctx, "trailer_size = %i\n", sconf->trailer_size);
#endif
}
MPEG4AudioConfig m4ac;
ALSSpecificConfig *sconf = &ctx->sconf;
AVCodecContext *avctx = ctx->avctx;
- uint32_t als_id;
+ uint32_t als_id, header_size, trailer_size;
init_get_bits(&gb, avctx->extradata, avctx->extradata_size * 8);
ctx->cur_frame_length = sconf->frame_length;
- // allocate quantized parcor coefficient buffer
- if (!(ctx->quant_cof = av_malloc(sizeof(*ctx->quant_cof) * sconf->max_order)) ||
- !(ctx->lpc_cof = av_malloc(sizeof(*ctx->lpc_cof) * sconf->max_order))) {
- av_log(avctx, AV_LOG_ERROR, "Allocating buffer memory failed.\n");
- return AVERROR(ENOMEM);
- }
-
// read channel config
if (sconf->chan_config)
sconf->chan_config_info = get_bits(&gb, 16);
if (get_bits_left(&gb) < 64)
return -1;
- sconf->header_size = get_bits_long(&gb, 32);
- sconf->trailer_size = get_bits_long(&gb, 32);
- if (sconf->header_size == 0xFFFFFFFF)
- sconf->header_size = 0;
- if (sconf->trailer_size == 0xFFFFFFFF)
- sconf->trailer_size = 0;
+ header_size = get_bits_long(&gb, 32);
+ trailer_size = get_bits_long(&gb, 32);
+ if (header_size == 0xFFFFFFFF)
+ header_size = 0;
+ if (trailer_size == 0xFFFFFFFF)
+ trailer_size = 0;
- ht_size = ((int64_t)(sconf->header_size) + (int64_t)(sconf->trailer_size)) << 3;
+ ht_size = ((int64_t)(header_size) + (int64_t)(trailer_size)) << 3;
// skip the header and trailer data
}
MISSING_ERR(sconf->floating, "Floating point decoding", -1);
- MISSING_ERR(sconf->bgmc, "BGMC entropy decoding", -1);
- MISSING_ERR(sconf->mc_coding, "Multi-channel correlation", -1);
MISSING_ERR(sconf->rlslms, "Adaptive RLS-LMS prediction", -1);
MISSING_ERR(sconf->chan_sort, "Channel sorting", 0);
unsigned int remaining = ctx->cur_frame_length;
for (b = 0; b < ctx->num_blocks; b++) {
- if (remaining < div_blocks[b]) {
+ if (remaining <= div_blocks[b]) {
div_blocks[b] = remaining;
ctx->num_blocks = b + 1;
break;
GetBitContext *gb = &ctx->gb;
unsigned int k;
unsigned int s[8];
+ unsigned int sx[8];
unsigned int sub_blocks, log2_sub_blocks, sb_length;
unsigned int start = 0;
unsigned int opt_order;
int sb;
int32_t *quant_cof = bd->quant_cof;
+ int32_t *current_res;
// ensure variable block decoding by reusing this field
sb_length = bd->block_length >> log2_sub_blocks;
-
if (sconf->bgmc) {
- // TODO: BGMC mode
+ s[0] = get_bits(gb, 8 + (sconf->resolution > 1));
+ for (k = 1; k < sub_blocks; k++)
+ s[k] = s[k - 1] + decode_rice(gb, 2);
+
+ for (k = 0; k < sub_blocks; k++) {
+ sx[k] = s[k] & 0x0F;
+ s [k] >>= 4;
+ }
} else {
s[0] = get_bits(gb, 4 + (sconf->resolution > 1));
for (k = 1; k < sub_blocks; k++)
*bd->use_ltp = get_bits1(gb);
if (*bd->use_ltp) {
+ int r, c;
+
bd->ltp_gain[0] = decode_rice(gb, 1) << 3;
bd->ltp_gain[1] = decode_rice(gb, 2) << 3;
- bd->ltp_gain[2] = ltp_gain_values[get_unary(gb, 0, 4)][get_bits(gb, 2)];
+ r = get_unary(gb, 0, 4);
+ c = get_bits(gb, 2);
+ bd->ltp_gain[2] = ltp_gain_values[r][c];
bd->ltp_gain[3] = decode_rice(gb, 2) << 3;
bd->ltp_gain[4] = decode_rice(gb, 1) << 3;
if (opt_order)
bd->raw_samples[0] = decode_rice(gb, avctx->bits_per_raw_sample - 4);
if (opt_order > 1)
- bd->raw_samples[1] = decode_rice(gb, s[0] + 3);
+ bd->raw_samples[1] = decode_rice(gb, FFMIN(s[0] + 3, ctx->s_max));
if (opt_order > 2)
- bd->raw_samples[2] = decode_rice(gb, s[0] + 1);
+ bd->raw_samples[2] = decode_rice(gb, FFMIN(s[0] + 1, ctx->s_max));
start = FFMIN(opt_order, 3);
}
// read all residuals
if (sconf->bgmc) {
- // TODO: BGMC mode
+ unsigned int delta[sub_blocks];
+ unsigned int k [sub_blocks];
+ unsigned int b = av_clip((av_ceil_log2(bd->block_length) - 3) >> 1, 0, 5);
+ unsigned int i = start;
+
+ // read most significant bits
+ unsigned int high;
+ unsigned int low;
+ unsigned int value;
+
+ ff_bgmc_decode_init(gb, &high, &low, &value);
+
+ current_res = bd->raw_samples + start;
+
+ for (sb = 0; sb < sub_blocks; sb++, i = 0) {
+ k [sb] = s[sb] > b ? s[sb] - b : 0;
+ delta[sb] = 5 - s[sb] + k[sb];
+
+ ff_bgmc_decode(gb, sb_length, current_res,
+ delta[sb], sx[sb], &high, &low, &value, ctx->bgmc_lut, ctx->bgmc_lut_status);
+
+ current_res += sb_length;
+ }
+
+ ff_bgmc_decode_end(gb);
+
+
+ // read least significant bits and tails
+ i = start;
+ current_res = bd->raw_samples + start;
+
+ for (sb = 0; sb < sub_blocks; sb++, i = 0) {
+ unsigned int cur_tail_code = tail_code[sx[sb]][delta[sb]];
+ unsigned int cur_k = k[sb];
+ unsigned int cur_s = s[sb];
+
+ for (; i < sb_length; i++) {
+ int32_t res = *current_res;
+
+ if (res == cur_tail_code) {
+ unsigned int max_msb = (2 + (sx[sb] > 2) + (sx[sb] > 10))
+ << (5 - delta[sb]);
+
+ res = decode_rice(gb, cur_s);
+
+ if (res >= 0) {
+ res += (max_msb ) << cur_k;
+ } else {
+ res -= (max_msb - 1) << cur_k;
+ }
+ } else {
+ if (res > cur_tail_code)
+ res--;
+
+ if (res & 1)
+ res = -res;
+
+ res >>= 1;
+
+ if (cur_k) {
+ res <<= cur_k;
+ res |= get_bits_long(gb, cur_k);
+ }
+ }
+
+ *current_res++ = res;
+ }
+ }
} else {
- int32_t *current_res = bd->raw_samples + start;
+ current_res = bd->raw_samples + start;
for (sb = 0; sb < sub_blocks; sb++, start = 0)
for (; start < sb_length; start++)
unsigned int block_length = bd->block_length;
unsigned int smp = 0;
unsigned int k;
- unsigned int opt_order = bd->opt_order;
+ int opt_order = bd->opt_order;
int sb;
int64_t y;
int32_t *quant_cof = bd->quant_cof;
int32_t *lpc_cof = bd->lpc_cof;
int32_t *raw_samples = bd->raw_samples;
+ int32_t *raw_samples_end = bd->raw_samples + bd->block_length;
+ int32_t *lpc_cof_reversed = ctx->lpc_cof_reversed_buffer;
// reverse long-term prediction
if (*bd->use_ltp) {
y = 1 << 19;
for (sb = 0; sb < smp; sb++)
- y += MUL64(lpc_cof[sb],raw_samples[smp - (sb + 1)]);
+ y += MUL64(lpc_cof[sb], raw_samples[-(sb + 1)]);
- raw_samples[smp] -= y >> 20;
+ *raw_samples++ -= y >> 20;
parcor_to_lpc(smp, quant_cof, lpc_cof);
}
} else {
raw_samples[sb] >>= bd->shift_lsbs;
}
+ // reverse linear prediction coefficients for efficiency
+ lpc_cof = lpc_cof + opt_order;
+
+ for (sb = 0; sb < opt_order; sb++)
+ lpc_cof_reversed[sb] = lpc_cof[-(sb + 1)];
+
// reconstruct raw samples
- for (; smp < bd->block_length; smp++) {
+ raw_samples = bd->raw_samples + smp;
+ lpc_cof = lpc_cof_reversed + opt_order;
+
+ for (; raw_samples < raw_samples_end; raw_samples++) {
y = 1 << 19;
- for (sb = 0; sb < opt_order; sb++)
- y += MUL64(bd->lpc_cof[sb],raw_samples[smp - (sb + 1)]);
+ for (sb = -opt_order; sb < 0; sb++)
+ y += MUL64(lpc_cof[sb], raw_samples[sb]);
- raw_samples[smp] -= y >> 20;
+ *raw_samples -= y >> 20;
}
+ raw_samples = bd->raw_samples;
+
// restore previous samples in case that they have been altered
if (bd->store_prev_samples)
memcpy(raw_samples - sconf->max_order, bd->prev_raw_samples,
bd.use_ltp = ctx->use_ltp;
bd.ltp_lag = ctx->ltp_lag;
bd.ltp_gain = ctx->ltp_gain[0];
- bd.quant_cof = ctx->quant_cof;
- bd.lpc_cof = ctx->lpc_cof;
+ bd.quant_cof = ctx->quant_cof[0];
+ bd.lpc_cof = ctx->lpc_cof[0];
bd.prev_raw_samples = ctx->prev_raw_samples;
bd.raw_samples = ctx->raw_samples[c];
bd[0].use_ltp = ctx->use_ltp;
bd[0].ltp_lag = ctx->ltp_lag;
bd[0].ltp_gain = ctx->ltp_gain[0];
- bd[0].quant_cof = ctx->quant_cof;
- bd[0].lpc_cof = ctx->lpc_cof;
+ bd[0].quant_cof = ctx->quant_cof[0];
+ bd[0].lpc_cof = ctx->lpc_cof[0];
bd[0].prev_raw_samples = ctx->prev_raw_samples;
bd[0].js_blocks = *js_blocks;
bd[1].use_ltp = ctx->use_ltp;
bd[1].ltp_lag = ctx->ltp_lag;
bd[1].ltp_gain = ctx->ltp_gain[0];
- bd[1].quant_cof = ctx->quant_cof;
- bd[1].lpc_cof = ctx->lpc_cof;
+ bd[1].quant_cof = ctx->quant_cof[0];
+ bd[1].lpc_cof = ctx->lpc_cof[0];
bd[1].prev_raw_samples = ctx->prev_raw_samples;
bd[1].js_blocks = *(js_blocks + 1);
}
+/** Reads the channel data.
+ */
+static int read_channel_data(ALSDecContext *ctx, ALSChannelData *cd, int c)
+{
+ GetBitContext *gb = &ctx->gb;
+ ALSChannelData *current = cd;
+ unsigned int channels = ctx->avctx->channels;
+ int entries = 0;
+
+ while (entries < channels && !(current->stop_flag = get_bits1(gb))) {
+ current->master_channel = get_bits_long(gb, av_ceil_log2(channels));
+
+ if (current->master_channel >= channels) {
+ av_log(ctx->avctx, AV_LOG_ERROR, "Invalid master channel!\n");
+ return -1;
+ }
+
+ if (current->master_channel != c) {
+ current->time_diff_flag = get_bits1(gb);
+ current->weighting[0] = mcc_weightings[av_clip(decode_rice(gb, 1) + 16, 0, 32)];
+ current->weighting[1] = mcc_weightings[av_clip(decode_rice(gb, 2) + 14, 0, 32)];
+ current->weighting[2] = mcc_weightings[av_clip(decode_rice(gb, 1) + 16, 0, 32)];
+
+ if (current->time_diff_flag) {
+ current->weighting[3] = mcc_weightings[av_clip(decode_rice(gb, 1) + 16, 0, 32)];
+ current->weighting[4] = mcc_weightings[av_clip(decode_rice(gb, 1) + 16, 0, 32)];
+ current->weighting[5] = mcc_weightings[av_clip(decode_rice(gb, 1) + 16, 0, 32)];
+
+ current->time_diff_sign = get_bits1(gb);
+ current->time_diff_index = get_bits(gb, ctx->ltp_lag_length - 3) + 3;
+ }
+ }
+
+ current++;
+ entries++;
+ }
+
+ if (entries == channels) {
+ av_log(ctx->avctx, AV_LOG_ERROR, "Damaged channel data!\n");
+ return -1;
+ }
+
+ align_get_bits(gb);
+ return 0;
+}
+
+
+/** Recursively reverts the inter-channel correlation for a block.
+ */
+static int revert_channel_correlation(ALSDecContext *ctx, ALSBlockData *bd,
+ ALSChannelData **cd, int *reverted,
+ unsigned int offset, int c)
+{
+ ALSChannelData *ch = cd[c];
+ unsigned int dep = 0;
+ unsigned int channels = ctx->avctx->channels;
+
+ if (reverted[c])
+ return 0;
+
+ reverted[c] = 1;
+
+ while (dep < channels && !ch[dep].stop_flag) {
+ revert_channel_correlation(ctx, bd, cd, reverted, offset,
+ ch[dep].master_channel);
+
+ dep++;
+ }
+
+ if (dep == channels) {
+ av_log(ctx->avctx, AV_LOG_WARNING, "Invalid channel correlation!\n");
+ return -1;
+ }
+
+ bd->use_ltp = ctx->use_ltp + c;
+ bd->ltp_lag = ctx->ltp_lag + c;
+ bd->ltp_gain = ctx->ltp_gain[c];
+ bd->lpc_cof = ctx->lpc_cof[c];
+ bd->quant_cof = ctx->quant_cof[c];
+ bd->raw_samples = ctx->raw_samples[c] + offset;
+
+ dep = 0;
+ while (!ch[dep].stop_flag) {
+ unsigned int smp;
+ unsigned int begin = 1;
+ unsigned int end = bd->block_length - 1;
+ int64_t y;
+ int32_t *master = ctx->raw_samples[ch[dep].master_channel] + offset;
+
+ if (ch[dep].time_diff_flag) {
+ int t = ch[dep].time_diff_index;
+
+ if (ch[dep].time_diff_sign) {
+ t = -t;
+ begin -= t;
+ } else {
+ end -= t;
+ }
+
+ for (smp = begin; smp < end; smp++) {
+ y = (1 << 6) +
+ MUL64(ch[dep].weighting[0], master[smp - 1 ]) +
+ MUL64(ch[dep].weighting[1], master[smp ]) +
+ MUL64(ch[dep].weighting[2], master[smp + 1 ]) +
+ MUL64(ch[dep].weighting[3], master[smp - 1 + t]) +
+ MUL64(ch[dep].weighting[4], master[smp + t]) +
+ MUL64(ch[dep].weighting[5], master[smp + 1 + t]);
+
+ bd->raw_samples[smp] += y >> 7;
+ }
+ } else {
+ for (smp = begin; smp < end; smp++) {
+ y = (1 << 6) +
+ MUL64(ch[dep].weighting[0], master[smp - 1]) +
+ MUL64(ch[dep].weighting[1], master[smp ]) +
+ MUL64(ch[dep].weighting[2], master[smp + 1]);
+
+ bd->raw_samples[smp] += y >> 7;
+ }
+ }
+
+ dep++;
+ }
+
+ return 0;
+}
+
+
/** Reads the frame data.
*/
static int read_frame_data(ALSDecContext *ctx, unsigned int ra_frame)
sizeof(*ctx->raw_samples[c]) * sconf->max_order);
}
} else { // multi-channel coding
+ ALSBlockData bd;
+ int b;
+ int *reverted_channels = ctx->reverted_channels;
+ unsigned int offset = 0;
+
+ for (c = 0; c < avctx->channels; c++)
+ if (ctx->chan_data[c] < ctx->chan_data_buffer) {
+ av_log(ctx->avctx, AV_LOG_ERROR, "Invalid channel data!\n");
+ return -1;
+ }
+
+ memset(&bd, 0, sizeof(ALSBlockData));
+ memset(reverted_channels, 0, sizeof(*reverted_channels) * avctx->channels);
+
+ bd.ra_block = ra_frame;
+ bd.prev_raw_samples = ctx->prev_raw_samples;
+
get_block_sizes(ctx, div_blocks, &bs_info);
- // TODO: multi channel coding might use a temporary buffer instead as
- // the actual channel is not known when read_block-data is called
- if (decode_blocks_ind(ctx, ra_frame, 0, div_blocks, js_blocks))
- return -1;
- // TODO: read_channel_data
+ for (b = 0; b < ctx->num_blocks; b++) {
+ bd.shift_lsbs = 0;
+ bd.block_length = div_blocks[b];
+
+ for (c = 0; c < avctx->channels; c++) {
+ bd.use_ltp = ctx->use_ltp + c;
+ bd.ltp_lag = ctx->ltp_lag + c;
+ bd.ltp_gain = ctx->ltp_gain[c];
+ bd.lpc_cof = ctx->lpc_cof[c];
+ bd.quant_cof = ctx->quant_cof[c];
+ bd.raw_samples = ctx->raw_samples[c] + offset;
+ bd.raw_other = NULL;
+
+ read_block(ctx, &bd);
+ if (read_channel_data(ctx, ctx->chan_data[c], c))
+ return -1;
+ }
+
+ for (c = 0; c < avctx->channels; c++)
+ if (revert_channel_correlation(ctx, &bd, ctx->chan_data,
+ reverted_channels, offset, c))
+ return -1;
+
+ for (c = 0; c < avctx->channels; c++) {
+ bd.use_ltp = ctx->use_ltp + c;
+ bd.ltp_lag = ctx->ltp_lag + c;
+ bd.ltp_gain = ctx->ltp_gain[c];
+ bd.lpc_cof = ctx->lpc_cof[c];
+ bd.quant_cof = ctx->quant_cof[c];
+ bd.raw_samples = ctx->raw_samples[c] + offset;
+ decode_block(ctx, &bd);
+ }
+
+ memset(reverted_channels, 0, avctx->channels * sizeof(*reverted_channels));
+ offset += div_blocks[b];
+ bd.ra_block = 0;
+ }
+
+ // store carryover raw samples
+ for (c = 0; c < avctx->channels; c++)
+ memmove(ctx->raw_samples[c] - sconf->max_order,
+ ctx->raw_samples[c] - sconf->max_order + sconf->frame_length,
+ sizeof(*ctx->raw_samples[c]) * sconf->max_order);
}
// TODO: read_diff_float_data
av_freep(&ctx->sconf.chan_pos);
+ ff_bgmc_end(&ctx->bgmc_lut, &ctx->bgmc_lut_status);
+
av_freep(&ctx->use_ltp);
av_freep(&ctx->ltp_lag);
av_freep(&ctx->ltp_gain);
av_freep(&ctx->ltp_gain_buffer);
av_freep(&ctx->quant_cof);
av_freep(&ctx->lpc_cof);
+ av_freep(&ctx->quant_cof_buffer);
+ av_freep(&ctx->lpc_cof_buffer);
+ av_freep(&ctx->lpc_cof_reversed_buffer);
av_freep(&ctx->prev_raw_samples);
av_freep(&ctx->raw_samples);
av_freep(&ctx->raw_buffer);
+ av_freep(&ctx->chan_data);
+ av_freep(&ctx->chan_data_buffer);
+ av_freep(&ctx->reverted_channels);
return 0;
}
return -1;
}
+ if (sconf->bgmc)
+ ff_bgmc_init(avctx, &ctx->bgmc_lut, &ctx->bgmc_lut_status);
+
if (sconf->floating) {
avctx->sample_fmt = SAMPLE_FMT_FLT;
avctx->bits_per_raw_sample = 32;
avctx->bits_per_raw_sample = (sconf->resolution + 1) * 8;
}
+ // set maximum Rice parameter for progressive decoding based on resolution
+ // This is not specified in 14496-3 but actually done by the reference
+ // codec RM22 revision 2.
+ ctx->s_max = sconf->resolution > 1 ? 31 : 15;
+
// set lag value for long-term prediction
ctx->ltp_lag_length = 8 + (avctx->sample_rate >= 96000) +
(avctx->sample_rate >= 192000);
// allocate quantized parcor coefficient buffer
num_buffers = sconf->mc_coding ? avctx->channels : 1;
+ ctx->quant_cof = av_malloc(sizeof(*ctx->quant_cof) * num_buffers);
+ ctx->lpc_cof = av_malloc(sizeof(*ctx->lpc_cof) * num_buffers);
+ ctx->quant_cof_buffer = av_malloc(sizeof(*ctx->quant_cof_buffer) *
+ num_buffers * sconf->max_order);
+ ctx->lpc_cof_buffer = av_malloc(sizeof(*ctx->lpc_cof_buffer) *
+ num_buffers * sconf->max_order);
+ ctx->lpc_cof_reversed_buffer = av_malloc(sizeof(*ctx->lpc_cof_buffer) *
+ sconf->max_order);
+
+ if (!ctx->quant_cof || !ctx->lpc_cof ||
+ !ctx->quant_cof_buffer || !ctx->lpc_cof_buffer ||
+ !ctx->lpc_cof_reversed_buffer) {
+ av_log(avctx, AV_LOG_ERROR, "Allocating buffer memory failed.\n");
+ return AVERROR(ENOMEM);
+ }
+
+ // assign quantized parcor coefficient buffers
+ for (c = 0; c < num_buffers; c++) {
+ ctx->quant_cof[c] = ctx->quant_cof_buffer + c * sconf->max_order;
+ ctx->lpc_cof[c] = ctx->lpc_cof_buffer + c * sconf->max_order;
+ }
+
// allocate and assign lag and gain data buffer for ltp mode
ctx->use_ltp = av_mallocz(sizeof(*ctx->use_ltp) * num_buffers);
ctx->ltp_lag = av_malloc (sizeof(*ctx->ltp_lag) * num_buffers);
for (c = 0; c < num_buffers; c++)
ctx->ltp_gain[c] = ctx->ltp_gain_buffer + c * 5;
+ // allocate and assign channel data buffer for mcc mode
+ if (sconf->mc_coding) {
+ ctx->chan_data_buffer = av_malloc(sizeof(*ctx->chan_data_buffer) *
+ num_buffers * num_buffers);
+ ctx->chan_data = av_malloc(sizeof(*ctx->chan_data) *
+ num_buffers);
+ ctx->reverted_channels = av_malloc(sizeof(*ctx->reverted_channels) *
+ num_buffers);
+
+ if (!ctx->chan_data_buffer || !ctx->chan_data || !ctx->reverted_channels) {
+ av_log(avctx, AV_LOG_ERROR, "Allocating buffer memory failed.\n");
+ decode_end(avctx);
+ return AVERROR(ENOMEM);
+ }
+
+ for (c = 0; c < num_buffers; c++)
+ ctx->chan_data[c] = ctx->chan_data_buffer + c * num_buffers;
+ } else {
+ ctx->chan_data = NULL;
+ ctx->chan_data_buffer = NULL;
+ ctx->reverted_channels = NULL;
+ }
+
avctx->frame_size = sconf->frame_length;
channel_size = sconf->frame_length + sconf->max_order;