* MPEG-4 ALS decoder
* Copyright (c) 2009 Thilo Borgmann <thilo.borgmann _at_ googlemail.com>
*
- * This file is part of FFmpeg.
+ * This file is part of Libav.
*
- * FFmpeg is free software; you can redistribute it and/or
+ * Libav is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
- * FFmpeg is distributed in the hope that it will be useful,
+ * Libav is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
- * License along with FFmpeg; if not, write to the Free Software
+ * License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
- * @file libavcodec/alsdec.c
+ * @file
* MPEG-4 ALS decoder
* @author Thilo Borgmann <thilo.borgmann _at_ googlemail.com>
*/
#include "mpeg4audio.h"
#include "bytestream.h"
#include "bgmc.h"
+#include "dsputil.h"
+#include "libavutil/samplefmt.h"
+#include "libavutil/crc.h"
#include <stdint.h>
/** Rice parameters and corresponding index offsets for decoding the
- * indices of scaled PARCOR values. The table choosen is set globally
+ * indices of scaled PARCOR values. The table chosen is set globally
* by the encoder and stored in ALSSpecificConfig.
*/
static const int8_t parcor_rice_table[3][20][2] = {
uint32_t samples; ///< number of samples, 0xFFFFFFFF if unknown
int resolution; ///< 000 = 8-bit; 001 = 16-bit; 010 = 24-bit; 011 = 32-bit
int floating; ///< 1 = IEEE 32-bit floating-point, 0 = integer
+ int msb_first; ///< 1 = original CRC calculated on big-endian system, 0 = little-endian
int frame_length; ///< frame length for each frame (last frame may differ)
int ra_distance; ///< distance between RA frames (in frames, 0...255)
enum RA_Flag ra_flag; ///< indicates where the size of ra units is stored
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
+ int crc_enabled; ///< enable Cyclic Redundancy Checksum
} ALSSpecificConfig;
typedef struct {
AVCodecContext *avctx;
+ AVFrame frame;
ALSSpecificConfig sconf;
GetBitContext gb;
+ DSPContext dsp;
+ const AVCRC *crc_table;
+ uint32_t crc_org; ///< CRC value of the original input data
+ uint32_t crc; ///< CRC value calculated from decoded data
unsigned int cur_frame_length; ///< length of the current frame to decode
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 *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 *const_block; ///< contains const_block flags for all channels
+ unsigned int *shift_lsbs; ///< contains shift_lsbs flags for all channels
+ unsigned int *opt_order; ///< contains opt_order flags for all channels
+ int *store_prev_samples; ///< contains store_prev_samples flags for all channels
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
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
+ uint8_t *crc_buffer; ///< buffer of byte order corrected samples used for CRC check
} ALSDecContext;
typedef struct {
unsigned int block_length; ///< number of samples within the block
unsigned int ra_block; ///< if true, this is a random access block
- int const_block; ///< if true, this is a constant value block
- int32_t const_val; ///< the sample value of a constant block
+ int *const_block; ///< if true, this is a constant value block
int js_blocks; ///< true if this block contains a difference signal
- unsigned int shift_lsbs; ///< shift of values for this block
- unsigned int opt_order; ///< prediction order of this block
- int store_prev_samples;///< if true, carryover samples have to be stored
+ unsigned int *shift_lsbs; ///< shift of values for this block
+ unsigned int *opt_order; ///< prediction order of this block
+ int *store_prev_samples;///< if true, carryover samples have to be stored
int *use_ltp; ///< if true, long-term prediction is used
int *ltp_lag; ///< lag value for long-term prediction
int *ltp_gain; ///< gain values for ltp 5-tap filter
AVCodecContext *avctx = ctx->avctx;
ALSSpecificConfig *sconf = &ctx->sconf;
- dprintf(avctx, "resolution = %i\n", sconf->resolution);
- dprintf(avctx, "floating = %i\n", sconf->floating);
- dprintf(avctx, "frame_length = %i\n", sconf->frame_length);
- dprintf(avctx, "ra_distance = %i\n", sconf->ra_distance);
- dprintf(avctx, "ra_flag = %i\n", sconf->ra_flag);
- dprintf(avctx, "adapt_order = %i\n", sconf->adapt_order);
- dprintf(avctx, "coef_table = %i\n", sconf->coef_table);
- dprintf(avctx, "long_term_prediction = %i\n", sconf->long_term_prediction);
- dprintf(avctx, "max_order = %i\n", sconf->max_order);
- dprintf(avctx, "block_switching = %i\n", sconf->block_switching);
- dprintf(avctx, "bgmc = %i\n", sconf->bgmc);
- dprintf(avctx, "sb_part = %i\n", sconf->sb_part);
- dprintf(avctx, "joint_stereo = %i\n", sconf->joint_stereo);
- dprintf(avctx, "mc_coding = %i\n", sconf->mc_coding);
- dprintf(avctx, "chan_config = %i\n", sconf->chan_config);
- 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);
+ av_dlog(avctx, "resolution = %i\n", sconf->resolution);
+ av_dlog(avctx, "floating = %i\n", sconf->floating);
+ av_dlog(avctx, "frame_length = %i\n", sconf->frame_length);
+ av_dlog(avctx, "ra_distance = %i\n", sconf->ra_distance);
+ av_dlog(avctx, "ra_flag = %i\n", sconf->ra_flag);
+ av_dlog(avctx, "adapt_order = %i\n", sconf->adapt_order);
+ av_dlog(avctx, "coef_table = %i\n", sconf->coef_table);
+ av_dlog(avctx, "long_term_prediction = %i\n", sconf->long_term_prediction);
+ av_dlog(avctx, "max_order = %i\n", sconf->max_order);
+ av_dlog(avctx, "block_switching = %i\n", sconf->block_switching);
+ av_dlog(avctx, "bgmc = %i\n", sconf->bgmc);
+ av_dlog(avctx, "sb_part = %i\n", sconf->sb_part);
+ av_dlog(avctx, "joint_stereo = %i\n", sconf->joint_stereo);
+ av_dlog(avctx, "mc_coding = %i\n", sconf->mc_coding);
+ av_dlog(avctx, "chan_config = %i\n", sconf->chan_config);
+ av_dlog(avctx, "chan_sort = %i\n", sconf->chan_sort);
+ av_dlog(avctx, "RLSLMS = %i\n", sconf->rlslms);
+ av_dlog(avctx, "chan_config_info = %i\n", sconf->chan_config_info);
#endif
}
-/** Reads an ALSSpecificConfig from a buffer into the output struct.
+/** Read an ALSSpecificConfig from a buffer into the output struct.
*/
static av_cold int read_specific_config(ALSDecContext *ctx)
{
GetBitContext gb;
uint64_t ht_size;
- int i, config_offset, crc_enabled;
+ int i, config_offset;
MPEG4AudioConfig m4ac;
ALSSpecificConfig *sconf = &ctx->sconf;
AVCodecContext *avctx = ctx->avctx;
init_get_bits(&gb, avctx->extradata, avctx->extradata_size * 8);
- config_offset = ff_mpeg4audio_get_config(&m4ac, avctx->extradata,
- avctx->extradata_size);
+ config_offset = avpriv_mpeg4audio_get_config(&m4ac, avctx->extradata,
+ avctx->extradata_size * 8, 1);
if (config_offset < 0)
return -1;
skip_bits(&gb, 3); // skip file_type
sconf->resolution = get_bits(&gb, 3);
sconf->floating = get_bits1(&gb);
- skip_bits1(&gb); // skip msb_first
+ sconf->msb_first = get_bits1(&gb);
sconf->frame_length = get_bits(&gb, 16) + 1;
sconf->ra_distance = get_bits(&gb, 8);
sconf->ra_flag = get_bits(&gb, 2);
sconf->mc_coding = get_bits1(&gb);
sconf->chan_config = get_bits1(&gb);
sconf->chan_sort = get_bits1(&gb);
- crc_enabled = get_bits1(&gb);
+ sconf->crc_enabled = get_bits1(&gb);
sconf->rlslms = get_bits1(&gb);
skip_bits(&gb, 5); // skip 5 reserved bits
skip_bits1(&gb); // skip aux_data_enabled
skip_bits_long(&gb, ht_size);
- // skip the crc data
- if (crc_enabled) {
+ // initialize CRC calculation
+ if (sconf->crc_enabled) {
if (get_bits_left(&gb) < 32)
return -1;
- skip_bits_long(&gb, 32);
+ if (avctx->err_recognition & AV_EF_CRCCHECK) {
+ ctx->crc_table = av_crc_get_table(AV_CRC_32_IEEE_LE);
+ ctx->crc = 0xFFFFFFFF;
+ ctx->crc_org = ~get_bits_long(&gb, 32);
+ } else
+ skip_bits_long(&gb, 32);
}
}
-/** Checks the ALSSpecificConfig for unsupported features.
+/** Check the ALSSpecificConfig for unsupported features.
*/
static int check_specific_config(ALSDecContext *ctx)
{
} \
}
- MISSING_ERR(sconf->floating, "Floating point decoding", -1);
- MISSING_ERR(sconf->rlslms, "Adaptive RLS-LMS prediction", -1);
- MISSING_ERR(sconf->chan_sort, "Channel sorting", 0);
+ MISSING_ERR(sconf->floating, "Floating point decoding", AVERROR_PATCHWELCOME);
+ MISSING_ERR(sconf->rlslms, "Adaptive RLS-LMS prediction", AVERROR_PATCHWELCOME);
+ MISSING_ERR(sconf->chan_sort, "Channel sorting", 0);
return error;
}
-/** Parses the bs_info field to extract the block partitioning used in
+/** Parse the bs_info field to extract the block partitioning used in
* block switching mode, refer to ISO/IEC 14496-3, section 11.6.2.
*/
static void parse_bs_info(const uint32_t bs_info, unsigned int n,
}
-/** Reads and decodes a Rice codeword.
+/** Read and decode a Rice codeword.
*/
static int32_t decode_rice(GetBitContext *gb, unsigned int k)
{
}
-/** Converts PARCOR coefficient k to direct filter coefficient.
+/** Convert PARCOR coefficient k to direct filter coefficient.
*/
static void parcor_to_lpc(unsigned int k, const int32_t *par, int32_t *cof)
{
}
-/** Reads block switching field if necessary and sets actual block sizes.
- * Also assures that the block sizes of the last frame correspond to the
+/** Read block switching field if necessary and set actual block sizes.
+ * Also assure that the block sizes of the last frame correspond to the
* actual number of samples.
*/
static void get_block_sizes(ALSDecContext *ctx, unsigned int *div_blocks,
}
-/** Reads the block data for a constant block
+/** Read the block data for a constant block
*/
static void read_const_block_data(ALSDecContext *ctx, ALSBlockData *bd)
{
AVCodecContext *avctx = ctx->avctx;
GetBitContext *gb = &ctx->gb;
- bd->const_val = 0;
- bd->const_block = get_bits1(gb); // 1 = constant value, 0 = zero block (silence)
+ *bd->raw_samples = 0;
+ *bd->const_block = get_bits1(gb); // 1 = constant value, 0 = zero block (silence)
bd->js_blocks = get_bits1(gb);
// skip 5 reserved bits
skip_bits(gb, 5);
- if (bd->const_block) {
+ if (*bd->const_block) {
unsigned int const_val_bits = sconf->floating ? 24 : avctx->bits_per_raw_sample;
- bd->const_val = get_sbits_long(gb, const_val_bits);
+ *bd->raw_samples = get_sbits_long(gb, const_val_bits);
}
// ensure constant block decoding by reusing this field
- bd->const_block = 1;
+ *bd->const_block = 1;
}
-/** Decodes the block data for a constant block
+/** Decode the block data for a constant block
*/
static void decode_const_block_data(ALSDecContext *ctx, ALSBlockData *bd)
{
- int smp = bd->block_length;
- int32_t val = bd->const_val;
- int32_t *dst = bd->raw_samples;
+ int smp = bd->block_length - 1;
+ int32_t val = *bd->raw_samples;
+ int32_t *dst = bd->raw_samples + 1;
// write raw samples into buffer
for (; smp; smp--)
}
-/** Reads the block data for a non-constant block
+/** Read the block data for a non-constant block
*/
static int read_var_block_data(ALSDecContext *ctx, ALSBlockData *bd)
{
// ensure variable block decoding by reusing this field
- bd->const_block = 0;
+ *bd->const_block = 0;
- bd->opt_order = 1;
+ *bd->opt_order = 1;
bd->js_blocks = get_bits1(gb);
- opt_order = bd->opt_order;
+ opt_order = *bd->opt_order;
// determine the number of subblocks for entropy decoding
if (!sconf->bgmc && !sconf->sb_part) {
for (k = 1; k < sub_blocks; k++)
s[k] = s[k - 1] + decode_rice(gb, 0);
}
+ for (k = 1; k < sub_blocks; k++)
+ if (s[k] > 32) {
+ av_log(avctx, AV_LOG_ERROR, "k invalid for rice code.\n");
+ return AVERROR_INVALIDDATA;
+ }
if (get_bits1(gb))
- bd->shift_lsbs = get_bits(gb, 4) + 1;
+ *bd->shift_lsbs = get_bits(gb, 4) + 1;
- bd->store_prev_samples = (bd->js_blocks && bd->raw_other) || bd->shift_lsbs;
+ *bd->store_prev_samples = (bd->js_blocks && bd->raw_other) || *bd->shift_lsbs;
if (!sconf->rlslms) {
if (sconf->adapt_order) {
int opt_order_length = av_ceil_log2(av_clip((bd->block_length >> 3) - 1,
2, sconf->max_order + 1));
- bd->opt_order = get_bits(gb, opt_order_length);
+ *bd->opt_order = get_bits(gb, opt_order_length);
+ if (*bd->opt_order > sconf->max_order) {
+ *bd->opt_order = sconf->max_order;
+ av_log(avctx, AV_LOG_ERROR, "Predictor order too large!\n");
+ return AVERROR_INVALIDDATA;
+ }
} else {
- bd->opt_order = sconf->max_order;
+ *bd->opt_order = sconf->max_order;
}
- opt_order = bd->opt_order;
+ opt_order = *bd->opt_order;
if (opt_order) {
int add_base;
int rice_param = parcor_rice_table[sconf->coef_table][k][1];
int offset = parcor_rice_table[sconf->coef_table][k][0];
quant_cof[k] = decode_rice(gb, rice_param) + offset;
+ if (quant_cof[k] < -64 || quant_cof[k] > 63) {
+ av_log(avctx, AV_LOG_ERROR, "quant_cof %d is out of range\n", quant_cof[k]);
+ return AVERROR_INVALIDDATA;
+ }
}
// read coefficients 20 to 126
bd->ltp_gain[0] = decode_rice(gb, 1) << 3;
bd->ltp_gain[1] = decode_rice(gb, 2) << 3;
- r = get_unary(gb, 0, 4);
+ r = get_unary(gb, 0, 3);
c = get_bits(gb, 2);
bd->ltp_gain[2] = ltp_gain_values[r][c];
// read all residuals
if (sconf->bgmc) {
- unsigned int delta[sub_blocks];
- unsigned int k [sub_blocks];
+ int delta[8];
+ unsigned int k [8];
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;
current_res = bd->raw_samples + start;
- for (sb = 0; sb < sub_blocks; sb++, i = 0) {
+ for (sb = 0; sb < sub_blocks; sb++) {
+ unsigned int sb_len = sb_length - (sb ? 0 : start);
+
k [sb] = s[sb] > b ? s[sb] - b : 0;
delta[sb] = 5 - s[sb] + k[sb];
- ff_bgmc_decode(gb, sb_length, current_res,
+ ff_bgmc_decode(gb, sb_len, current_res,
delta[sb], sx[sb], &high, &low, &value, ctx->bgmc_lut, ctx->bgmc_lut_status);
- current_res += sb_length;
+ current_res += sb_len;
}
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) {
+ for (sb = 0; sb < sub_blocks; sb++, start = 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++) {
+ for (; start < sb_length; start++) {
int32_t res = *current_res;
if (res == cur_tail_code) {
}
-/** Decodes the block data for a non-constant block
+/** Decode the block data for a non-constant block
*/
static int decode_var_block_data(ALSDecContext *ctx, ALSBlockData *bd)
{
unsigned int block_length = bd->block_length;
unsigned int smp = 0;
unsigned int k;
- int opt_order = bd->opt_order;
+ int opt_order = *bd->opt_order;
int sb;
int64_t y;
int32_t *quant_cof = bd->quant_cof;
parcor_to_lpc(k, quant_cof, lpc_cof);
// store previous samples in case that they have to be altered
- if (bd->store_prev_samples)
+ if (*bd->store_prev_samples)
memcpy(bd->prev_raw_samples, raw_samples - sconf->max_order,
sizeof(*bd->prev_raw_samples) * sconf->max_order);
}
// reconstruct shifted signal
- if (bd->shift_lsbs)
+ if (*bd->shift_lsbs)
for (sb = -1; sb >= -sconf->max_order; sb--)
- raw_samples[sb] >>= bd->shift_lsbs;
+ raw_samples[sb] >>= *bd->shift_lsbs;
}
// reverse linear prediction coefficients for efficiency
raw_samples = bd->raw_samples;
// restore previous samples in case that they have been altered
- if (bd->store_prev_samples)
+ if (*bd->store_prev_samples)
memcpy(raw_samples - sconf->max_order, bd->prev_raw_samples,
sizeof(*raw_samples) * sconf->max_order);
}
-/** Reads the block data.
+/** Read the block data.
*/
static int read_block(ALSDecContext *ctx, ALSBlockData *bd)
{
GetBitContext *gb = &ctx->gb;
+ *bd->shift_lsbs = 0;
// read block type flag and read the samples accordingly
if (get_bits1(gb)) {
if (read_var_block_data(ctx, bd))
}
-/** Decodes the block data.
+/** Decode the block data.
*/
static int decode_block(ALSDecContext *ctx, ALSBlockData *bd)
{
unsigned int smp;
// read block type flag and read the samples accordingly
- if (bd->const_block)
+ if (*bd->const_block)
decode_const_block_data(ctx, bd);
else if (decode_var_block_data(ctx, bd))
return -1;
// TODO: read RLSLMS extension data
- if (bd->shift_lsbs)
+ if (*bd->shift_lsbs)
for (smp = 0; smp < bd->block_length; smp++)
- bd->raw_samples[smp] <<= bd->shift_lsbs;
+ bd->raw_samples[smp] <<= *bd->shift_lsbs;
return 0;
}
-/** Reads and decodes block data successively.
+/** Read and decode block data successively.
*/
static int read_decode_block(ALSDecContext *ctx, ALSBlockData *bd)
{
}
-/** Computes the number of samples left to decode for the current frame and
+/** Compute the number of samples left to decode for the current frame and
* sets these samples to zero.
*/
static void zero_remaining(unsigned int b, unsigned int b_max,
{
unsigned int count = 0;
- while (b < b_max)
+ for (; b < b_max; b++)
count += div_blocks[b];
if (count)
}
-/** Decodes blocks independently.
+/** Decode blocks independently.
*/
static int decode_blocks_ind(ALSDecContext *ctx, unsigned int ra_frame,
unsigned int c, const unsigned int *div_blocks,
unsigned int *js_blocks)
{
unsigned int b;
- ALSBlockData bd;
-
- memset(&bd, 0, sizeof(ALSBlockData));
+ ALSBlockData bd = { 0 };
bd.ra_block = ra_frame;
+ bd.const_block = ctx->const_block;
+ bd.shift_lsbs = ctx->shift_lsbs;
+ bd.opt_order = ctx->opt_order;
+ bd.store_prev_samples = ctx->store_prev_samples;
bd.use_ltp = ctx->use_ltp;
bd.ltp_lag = ctx->ltp_lag;
bd.ltp_gain = ctx->ltp_gain[0];
for (b = 0; b < ctx->num_blocks; b++) {
- bd.shift_lsbs = 0;
bd.block_length = div_blocks[b];
if (read_decode_block(ctx, &bd)) {
}
-/** Decodes blocks dependently.
+/** Decode blocks dependently.
*/
static int decode_blocks(ALSDecContext *ctx, unsigned int ra_frame,
unsigned int c, const unsigned int *div_blocks,
ALSSpecificConfig *sconf = &ctx->sconf;
unsigned int offset = 0;
unsigned int b;
- ALSBlockData bd[2];
-
- memset(bd, 0, 2 * sizeof(ALSBlockData));
+ ALSBlockData bd[2] = { { 0 } };
bd[0].ra_block = ra_frame;
+ bd[0].const_block = ctx->const_block;
+ bd[0].shift_lsbs = ctx->shift_lsbs;
+ bd[0].opt_order = ctx->opt_order;
+ bd[0].store_prev_samples = ctx->store_prev_samples;
bd[0].use_ltp = ctx->use_ltp;
bd[0].ltp_lag = ctx->ltp_lag;
bd[0].ltp_gain = ctx->ltp_gain[0];
bd[0].js_blocks = *js_blocks;
bd[1].ra_block = ra_frame;
+ bd[1].const_block = ctx->const_block;
+ bd[1].shift_lsbs = ctx->shift_lsbs;
+ bd[1].opt_order = ctx->opt_order;
+ bd[1].store_prev_samples = ctx->store_prev_samples;
bd[1].use_ltp = ctx->use_ltp;
bd[1].ltp_lag = ctx->ltp_lag;
bd[1].ltp_gain = ctx->ltp_gain[0];
for (b = 0; b < ctx->num_blocks; b++) {
unsigned int s;
- bd[0].shift_lsbs = 0;
- bd[1].shift_lsbs = 0;
-
bd[0].block_length = div_blocks[b];
bd[1].block_length = div_blocks[b];
}
-/** Reads the channel data.
+/** Read the channel data.
*/
static int read_channel_data(ALSDecContext *ctx, ALSChannelData *cd, int c)
{
return -1;
}
+ bd->const_block = ctx->const_block + c;
+ bd->shift_lsbs = ctx->shift_lsbs + c;
+ bd->opt_order = ctx->opt_order + c;
+ bd->store_prev_samples = ctx->store_prev_samples + c;
bd->use_ltp = ctx->use_ltp + c;
bd->ltp_lag = ctx->ltp_lag + c;
bd->ltp_gain = ctx->ltp_gain[c];
}
-/** Reads the frame data.
+/** Read 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;
+ ALSBlockData bd = { 0 };
+ int b, ret;
int *reverted_channels = ctx->reverted_channels;
unsigned int offset = 0;
return -1;
}
- memset(&bd, 0, sizeof(ALSBlockData));
memset(reverted_channels, 0, sizeof(*reverted_channels) * avctx->channels);
bd.ra_block = ra_frame;
get_block_sizes(ctx, div_blocks, &bs_info);
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.const_block = ctx->const_block + c;
+ bd.shift_lsbs = ctx->shift_lsbs + c;
+ bd.opt_order = ctx->opt_order + c;
+ bd.store_prev_samples = ctx->store_prev_samples + c;
bd.use_ltp = ctx->use_ltp + c;
bd.ltp_lag = ctx->ltp_lag + c;
bd.ltp_gain = ctx->ltp_gain[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;
+ if ((ret = read_block(ctx, &bd)) < 0)
+ return ret;
+ if ((ret = read_channel_data(ctx, ctx->chan_data[c], c)) < 0)
+ return ret;
}
for (c = 0; c < avctx->channels; c++)
return -1;
for (c = 0; c < avctx->channels; c++) {
+ bd.const_block = ctx->const_block + c;
+ bd.shift_lsbs = ctx->shift_lsbs + c;
+ bd.opt_order = ctx->opt_order + c;
+ bd.store_prev_samples = ctx->store_prev_samples + 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);
+ if ((ret = decode_block(ctx, &bd)) < 0)
+ return ret;
}
memset(reverted_channels, 0, avctx->channels * sizeof(*reverted_channels));
}
-/** Decodes an ALS frame.
+/** Decode an ALS frame.
*/
-static int decode_frame(AVCodecContext *avctx,
- void *data, int *data_size,
+static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame_ptr,
AVPacket *avpkt)
{
ALSDecContext *ctx = avctx->priv_data;
ALSSpecificConfig *sconf = &ctx->sconf;
const uint8_t *buffer = avpkt->data;
int buffer_size = avpkt->size;
- int invalid_frame, size;
+ int invalid_frame, ret;
unsigned int c, sample, ra_frame, bytes_read, shift;
init_get_bits(&ctx->gb, buffer, buffer_size * 8);
ctx->cur_frame_length = sconf->frame_length;
// decode the frame data
- if ((invalid_frame = read_frame_data(ctx, ra_frame) < 0))
+ if ((invalid_frame = read_frame_data(ctx, ra_frame)) < 0)
av_log(ctx->avctx, AV_LOG_WARNING,
"Reading frame data failed. Skipping RA unit.\n");
ctx->frame_id++;
- // check for size of decoded data
- size = ctx->cur_frame_length * avctx->channels *
- (av_get_bits_per_sample_format(avctx->sample_fmt) >> 3);
-
- if (size > *data_size) {
- av_log(avctx, AV_LOG_ERROR, "Decoded data exceeds buffer size.\n");
- return -1;
+ /* get output buffer */
+ ctx->frame.nb_samples = ctx->cur_frame_length;
+ if ((ret = avctx->get_buffer(avctx, &ctx->frame)) < 0) {
+ av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
+ return ret;
}
- *data_size = size;
-
// transform decoded frame into output format
#define INTERLEAVE_OUTPUT(bps) \
{ \
- int##bps##_t *dest = (int##bps##_t*) data; \
+ int##bps##_t *dest = (int##bps##_t*)ctx->frame.data[0]; \
shift = bps - ctx->avctx->bits_per_raw_sample; \
for (sample = 0; sample < ctx->cur_frame_length; sample++) \
for (c = 0; c < avctx->channels; c++) \
INTERLEAVE_OUTPUT(32)
}
+ // update CRC
+ if (sconf->crc_enabled && (avctx->err_recognition & AV_EF_CRCCHECK)) {
+ int swap = HAVE_BIGENDIAN != sconf->msb_first;
+
+ if (ctx->avctx->bits_per_raw_sample == 24) {
+ int32_t *src = (int32_t *)ctx->frame.data[0];
+
+ for (sample = 0;
+ sample < ctx->cur_frame_length * avctx->channels;
+ sample++) {
+ int32_t v;
+
+ if (swap)
+ v = av_bswap32(src[sample]);
+ else
+ v = src[sample];
+ if (!HAVE_BIGENDIAN)
+ v >>= 8;
+
+ ctx->crc = av_crc(ctx->crc_table, ctx->crc, (uint8_t*)(&v), 3);
+ }
+ } else {
+ uint8_t *crc_source;
+
+ if (swap) {
+ if (ctx->avctx->bits_per_raw_sample <= 16) {
+ int16_t *src = (int16_t*) ctx->frame.data[0];
+ int16_t *dest = (int16_t*) ctx->crc_buffer;
+ for (sample = 0;
+ sample < ctx->cur_frame_length * avctx->channels;
+ sample++)
+ *dest++ = av_bswap16(src[sample]);
+ } else {
+ ctx->dsp.bswap_buf((uint32_t*)ctx->crc_buffer,
+ (uint32_t *)ctx->frame.data[0],
+ ctx->cur_frame_length * avctx->channels);
+ }
+ crc_source = ctx->crc_buffer;
+ } else {
+ crc_source = ctx->frame.data[0];
+ }
+
+ ctx->crc = av_crc(ctx->crc_table, ctx->crc, crc_source,
+ ctx->cur_frame_length * avctx->channels *
+ av_get_bytes_per_sample(avctx->sample_fmt));
+ }
+
+
+ // check CRC sums if this is the last frame
+ if (ctx->cur_frame_length != sconf->frame_length &&
+ ctx->crc_org != ctx->crc) {
+ av_log(avctx, AV_LOG_ERROR, "CRC error.\n");
+ }
+ }
+
+ *got_frame_ptr = 1;
+ *(AVFrame *)data = ctx->frame;
+
+
bytes_read = invalid_frame ? buffer_size :
(get_bits_count(&ctx->gb) + 7) >> 3;
}
-/** Uninitializes the ALS decoder.
+/** Uninitialize the ALS decoder.
*/
static av_cold int decode_end(AVCodecContext *avctx)
{
ff_bgmc_end(&ctx->bgmc_lut, &ctx->bgmc_lut_status);
+ av_freep(&ctx->const_block);
+ av_freep(&ctx->shift_lsbs);
+ av_freep(&ctx->opt_order);
+ av_freep(&ctx->store_prev_samples);
av_freep(&ctx->use_ltp);
av_freep(&ctx->ltp_lag);
av_freep(&ctx->ltp_gain);
av_freep(&ctx->chan_data);
av_freep(&ctx->chan_data_buffer);
av_freep(&ctx->reverted_channels);
+ av_freep(&ctx->crc_buffer);
return 0;
}
-/** Initializes the ALS decoder.
+/** Initialize the ALS decoder.
*/
static av_cold int decode_init(AVCodecContext *avctx)
{
ff_bgmc_init(avctx, &ctx->bgmc_lut, &ctx->bgmc_lut_status);
if (sconf->floating) {
- avctx->sample_fmt = SAMPLE_FMT_FLT;
+ avctx->sample_fmt = AV_SAMPLE_FMT_FLT;
avctx->bits_per_raw_sample = 32;
} else {
avctx->sample_fmt = sconf->resolution > 1
- ? SAMPLE_FMT_S32 : SAMPLE_FMT_S16;
+ ? AV_SAMPLE_FMT_S32 : AV_SAMPLE_FMT_S16;
avctx->bits_per_raw_sample = (sconf->resolution + 1) * 8;
}
}
// allocate and assign lag and gain data buffer for ltp mode
+ ctx->const_block = av_malloc (sizeof(*ctx->const_block) * num_buffers);
+ ctx->shift_lsbs = av_malloc (sizeof(*ctx->shift_lsbs) * num_buffers);
+ ctx->opt_order = av_malloc (sizeof(*ctx->opt_order) * num_buffers);
+ ctx->store_prev_samples = av_malloc(sizeof(*ctx->store_prev_samples) * num_buffers);
ctx->use_ltp = av_mallocz(sizeof(*ctx->use_ltp) * num_buffers);
ctx->ltp_lag = av_malloc (sizeof(*ctx->ltp_lag) * num_buffers);
ctx->ltp_gain = av_malloc (sizeof(*ctx->ltp_gain) * num_buffers);
ctx->ltp_gain_buffer = av_malloc (sizeof(*ctx->ltp_gain_buffer) *
num_buffers * 5);
- if (!ctx->use_ltp || !ctx->ltp_lag ||
+ if (!ctx->const_block || !ctx->shift_lsbs ||
+ !ctx->opt_order || !ctx->store_prev_samples ||
+ !ctx->use_ltp || !ctx->ltp_lag ||
!ctx->ltp_gain || !ctx->ltp_gain_buffer) {
av_log(avctx, AV_LOG_ERROR, "Allocating buffer memory failed.\n");
decode_end(avctx);
ctx->reverted_channels = NULL;
}
- avctx->frame_size = sconf->frame_length;
channel_size = sconf->frame_length + sconf->max_order;
ctx->prev_raw_samples = av_malloc (sizeof(*ctx->prev_raw_samples) * sconf->max_order);
for (c = 1; c < avctx->channels; c++)
ctx->raw_samples[c] = ctx->raw_samples[c - 1] + channel_size;
+ // allocate crc buffer
+ if (HAVE_BIGENDIAN != sconf->msb_first && sconf->crc_enabled &&
+ (avctx->err_recognition & AV_EF_CRCCHECK)) {
+ ctx->crc_buffer = av_malloc(sizeof(*ctx->crc_buffer) *
+ ctx->cur_frame_length *
+ avctx->channels *
+ av_get_bytes_per_sample(avctx->sample_fmt));
+ if (!ctx->crc_buffer) {
+ av_log(avctx, AV_LOG_ERROR, "Allocating buffer memory failed.\n");
+ decode_end(avctx);
+ return AVERROR(ENOMEM);
+ }
+ }
+
+ ff_dsputil_init(&ctx->dsp, avctx);
+
+ avcodec_get_frame_defaults(&ctx->frame);
+ avctx->coded_frame = &ctx->frame;
+
return 0;
}
-/** Flushes (resets) the frame ID after seeking.
+/** Flush (reset) the frame ID after seeking.
*/
static av_cold void flush(AVCodecContext *avctx)
{
}
-AVCodec als_decoder = {
- "als",
- CODEC_TYPE_AUDIO,
- CODEC_ID_MP4ALS,
- sizeof(ALSDecContext),
- decode_init,
- NULL,
- decode_end,
- decode_frame,
- .flush = flush,
- .capabilities = CODEC_CAP_SUBFRAMES,
- .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 Audio Lossless Coding (ALS)"),
+AVCodec ff_als_decoder = {
+ .name = "als",
+ .type = AVMEDIA_TYPE_AUDIO,
+ .id = AV_CODEC_ID_MP4ALS,
+ .priv_data_size = sizeof(ALSDecContext),
+ .init = decode_init,
+ .close = decode_end,
+ .decode = decode_frame,
+ .flush = flush,
+ .capabilities = CODEC_CAP_SUBFRAMES | CODEC_CAP_DR1,
+ .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 Audio Lossless Coding (ALS)"),
};
-
projects / ffmpeg / blobdiff