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Read and decode block data in separate functions to prepare support for
multi-channel correlation mode. Originally committed as revision 20825 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Thilo Borgmann
parent
a76cf4e197
commit
1261b07f5f
@ -151,6 +151,10 @@ typedef struct {
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unsigned int js_switch; ///< if true, joint-stereo decoding is enforced
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unsigned int num_blocks; ///< number of blocks used in the current frame
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int ltp_lag_length; ///< number of bits used for ltp lag value
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int *use_ltp; ///< contains use_ltp flags for all channels
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int *ltp_lag; ///< contains ltp lag values for all channels
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int **ltp_gain; ///< gain values for ltp 5-tap filter for a channel
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int *ltp_gain_buffer; ///< contains all gain values for ltp 5-tap filter
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int32_t *quant_cof; ///< quantized parcor coefficients
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int32_t *lpc_cof; ///< coefficients of the direct form prediction filter
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int32_t *prev_raw_samples; ///< contains unshifted raw samples from the previous block
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@ -159,6 +163,26 @@ typedef struct {
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} ALSDecContext;
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typedef struct {
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unsigned int block_length; ///< number of samples within the block
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unsigned int ra_block; ///< if true, this is a random access block
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int const_block; ///< if true, this is a constant value block
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int32_t const_val; ///< the sample value of a constant block
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int js_blocks; ///< true if this block contains a difference signal
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unsigned int shift_lsbs; ///< shift of values for this block
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unsigned int opt_order; ///< prediction order of this block
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int store_prev_samples;///< if true, carryover samples have to be stored
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int *use_ltp; ///< if true, long-term prediction is used
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int *ltp_lag; ///< lag value for long-term prediction
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int *ltp_gain; ///< gain values for ltp 5-tap filter
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int32_t *quant_cof; ///< quantized parcor coefficients
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int32_t *lpc_cof; ///< coefficients of the direct form prediction
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int32_t *raw_samples; ///< decoded raw samples / residuals for this block
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int32_t *prev_raw_samples; ///< contains unshifted raw samples from the previous block
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int32_t *raw_other; ///< decoded raw samples of the other channel of a channel pair
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} ALSBlockData;
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static av_cold void dprint_specific_config(ALSDecContext *ctx)
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{
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#ifdef DEBUG
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@ -469,38 +493,46 @@ static void get_block_sizes(ALSDecContext *ctx, unsigned int *div_blocks,
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/** Reads the block data for a constant block
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*/
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static void read_const_block(ALSDecContext *ctx, int32_t *raw_samples,
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unsigned int block_length, unsigned int *js_blocks)
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static void read_const_block_data(ALSDecContext *ctx, ALSBlockData *bd)
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{
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ALSSpecificConfig *sconf = &ctx->sconf;
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AVCodecContext *avctx = ctx->avctx;
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GetBitContext *gb = &ctx->gb;
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int32_t const_val = 0;
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unsigned int const_block, k;
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const_block = get_bits1(gb); // 1 = constant value, 0 = zero block (silence)
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*js_blocks = get_bits1(gb);
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bd->const_val = 0;
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bd->const_block = get_bits1(gb); // 1 = constant value, 0 = zero block (silence)
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bd->js_blocks = get_bits1(gb);
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// skip 5 reserved bits
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skip_bits(gb, 5);
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if (const_block) {
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if (bd->const_block) {
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unsigned int const_val_bits = sconf->floating ? 24 : avctx->bits_per_raw_sample;
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const_val = get_sbits_long(gb, const_val_bits);
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bd->const_val = get_sbits_long(gb, const_val_bits);
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}
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// ensure constant block decoding by reusing this field
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bd->const_block = 1;
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}
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/** Decodes the block data for a constant block
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*/
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static void decode_const_block_data(ALSDecContext *ctx, ALSBlockData *bd)
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{
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int smp = bd->block_length;
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int32_t val = bd->const_val;
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int32_t *dst = bd->raw_samples;
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// write raw samples into buffer
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for (k = 0; k < block_length; k++)
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raw_samples[k] = const_val;
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for (; smp; smp--)
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*dst++ = val;
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}
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/** Reads the block data for a non-constant block
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*/
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static int read_var_block(ALSDecContext *ctx, unsigned int ra_block,
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int32_t *raw_samples, unsigned int block_length,
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unsigned int *js_blocks, int32_t *raw_other,
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unsigned int *shift_lsbs)
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static int read_var_block_data(ALSDecContext *ctx, ALSBlockData *bd)
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{
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ALSSpecificConfig *sconf = &ctx->sconf;
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AVCodecContext *avctx = ctx->avctx;
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@ -508,18 +540,19 @@ static int read_var_block(ALSDecContext *ctx, unsigned int ra_block,
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unsigned int k;
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unsigned int s[8];
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unsigned int sub_blocks, log2_sub_blocks, sb_length;
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unsigned int opt_order = 1;
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int32_t *quant_cof = ctx->quant_cof;
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int32_t *lpc_cof = ctx->lpc_cof;
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unsigned int start = 0;
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int smp = 0;
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int sb, store_prev_samples;
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int64_t y;
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int use_ltp = 0;
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int ltp_lag = 0;
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int ltp_gain[5];
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unsigned int opt_order;
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int sb;
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int32_t *quant_cof = bd->quant_cof;
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*js_blocks = get_bits1(gb);
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// ensure variable block decoding by reusing this field
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bd->const_block = 0;
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bd->opt_order = 1;
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bd->js_blocks = get_bits1(gb);
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opt_order = bd->opt_order;
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// determine the number of subblocks for entropy decoding
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if (!sconf->bgmc && !sconf->sb_part) {
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@ -535,13 +568,13 @@ static int read_var_block(ALSDecContext *ctx, unsigned int ra_block,
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// do not continue in case of a damaged stream since
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// block_length must be evenly divisible by sub_blocks
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if (block_length & (sub_blocks - 1)) {
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if (bd->block_length & (sub_blocks - 1)) {
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av_log(avctx, AV_LOG_WARNING,
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"Block length is not evenly divisible by the number of subblocks.\n");
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return -1;
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}
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sb_length = block_length >> log2_sub_blocks;
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sb_length = bd->block_length >> log2_sub_blocks;
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if (sconf->bgmc) {
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@ -553,20 +586,22 @@ static int read_var_block(ALSDecContext *ctx, unsigned int ra_block,
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}
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if (get_bits1(gb))
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*shift_lsbs = get_bits(gb, 4) + 1;
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bd->shift_lsbs = get_bits(gb, 4) + 1;
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store_prev_samples = (*js_blocks && raw_other) || *shift_lsbs;
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bd->store_prev_samples = (bd->js_blocks && bd->raw_other) || bd->shift_lsbs;
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if (!sconf->rlslms) {
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if (sconf->adapt_order) {
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int opt_order_length = av_ceil_log2(av_clip((block_length >> 3) - 1,
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int opt_order_length = av_ceil_log2(av_clip((bd->block_length >> 3) - 1,
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2, sconf->max_order + 1));
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opt_order = get_bits(gb, opt_order_length);
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bd->opt_order = get_bits(gb, opt_order_length);
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} else {
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opt_order = sconf->max_order;
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bd->opt_order = sconf->max_order;
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}
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opt_order = bd->opt_order;
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if (opt_order) {
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int add_base;
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@ -617,30 +652,30 @@ static int read_var_block(ALSDecContext *ctx, unsigned int ra_block,
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// read LTP gain and lag values
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if (sconf->long_term_prediction) {
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use_ltp = get_bits1(gb);
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*bd->use_ltp = get_bits1(gb);
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if (use_ltp) {
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ltp_gain[0] = decode_rice(gb, 1) << 3;
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ltp_gain[1] = decode_rice(gb, 2) << 3;
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if (*bd->use_ltp) {
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bd->ltp_gain[0] = decode_rice(gb, 1) << 3;
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bd->ltp_gain[1] = decode_rice(gb, 2) << 3;
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ltp_gain[2] = ltp_gain_values[get_unary(gb, 0, 4)][get_bits(gb, 2)];
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bd->ltp_gain[2] = ltp_gain_values[get_unary(gb, 0, 4)][get_bits(gb, 2)];
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ltp_gain[3] = decode_rice(gb, 2) << 3;
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ltp_gain[4] = decode_rice(gb, 1) << 3;
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bd->ltp_gain[3] = decode_rice(gb, 2) << 3;
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bd->ltp_gain[4] = decode_rice(gb, 1) << 3;
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ltp_lag = get_bits(gb, ctx->ltp_lag_length);
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ltp_lag += FFMAX(4, opt_order + 1);
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*bd->ltp_lag = get_bits(gb, ctx->ltp_lag_length);
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*bd->ltp_lag += FFMAX(4, opt_order + 1);
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}
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}
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// read first value and residuals in case of a random access block
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if (ra_block) {
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if (bd->ra_block) {
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if (opt_order)
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raw_samples[0] = decode_rice(gb, avctx->bits_per_raw_sample - 4);
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bd->raw_samples[0] = decode_rice(gb, avctx->bits_per_raw_sample - 4);
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if (opt_order > 1)
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raw_samples[1] = decode_rice(gb, s[0] + 3);
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bd->raw_samples[1] = decode_rice(gb, s[0] + 3);
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if (opt_order > 2)
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raw_samples[2] = decode_rice(gb, s[0] + 1);
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bd->raw_samples[2] = decode_rice(gb, s[0] + 1);
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start = FFMIN(opt_order, 3);
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}
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@ -649,19 +684,41 @@ static int read_var_block(ALSDecContext *ctx, unsigned int ra_block,
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if (sconf->bgmc) {
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// TODO: BGMC mode
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} else {
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int32_t *current_res = raw_samples + start;
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int32_t *current_res = bd->raw_samples + start;
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for (sb = 0; sb < sub_blocks; sb++, start = 0)
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for (; start < sb_length; start++)
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*current_res++ = decode_rice(gb, s[sb]);
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}
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if (!sconf->mc_coding || ctx->js_switch)
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align_get_bits(gb);
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return 0;
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}
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/** Decodes the block data for a non-constant block
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*/
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static int decode_var_block_data(ALSDecContext *ctx, ALSBlockData *bd)
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{
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ALSSpecificConfig *sconf = &ctx->sconf;
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unsigned int block_length = bd->block_length;
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unsigned int smp = 0;
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unsigned int k;
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unsigned int opt_order = bd->opt_order;
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int sb;
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int64_t y;
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int32_t *quant_cof = bd->quant_cof;
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int32_t *lpc_cof = bd->lpc_cof;
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int32_t *raw_samples = bd->raw_samples;
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// reverse long-term prediction
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if (use_ltp) {
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if (*bd->use_ltp) {
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int ltp_smp;
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for (ltp_smp = FFMAX(ltp_lag - 2, 0); ltp_smp < block_length; ltp_smp++) {
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int center = ltp_smp - ltp_lag;
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for (ltp_smp = FFMAX(*bd->ltp_lag - 2, 0); ltp_smp < block_length; ltp_smp++) {
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int center = ltp_smp - *bd->ltp_lag;
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int begin = FFMAX(0, center - 2);
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int end = center + 3;
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int tab = 5 - (end - begin);
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@ -670,14 +727,14 @@ static int read_var_block(ALSDecContext *ctx, unsigned int ra_block,
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y = 1 << 6;
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for (base = begin; base < end; base++, tab++)
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y += MUL64(ltp_gain[tab], raw_samples[base]);
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y += MUL64(bd->ltp_gain[tab], raw_samples[base]);
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raw_samples[ltp_smp] += y >> 7;
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}
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}
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// reconstruct all samples from residuals
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if (ra_block) {
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if (bd->ra_block) {
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for (smp = 0; smp < opt_order; smp++) {
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y = 1 << 19;
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@ -692,19 +749,19 @@ static int read_var_block(ALSDecContext *ctx, unsigned int ra_block,
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parcor_to_lpc(k, quant_cof, lpc_cof);
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// store previous samples in case that they have to be altered
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if (store_prev_samples)
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memcpy(ctx->prev_raw_samples, raw_samples - sconf->max_order,
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sizeof(*ctx->prev_raw_samples) * sconf->max_order);
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if (bd->store_prev_samples)
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memcpy(bd->prev_raw_samples, raw_samples - sconf->max_order,
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sizeof(*bd->prev_raw_samples) * sconf->max_order);
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// reconstruct difference signal for prediction (joint-stereo)
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if (*js_blocks && raw_other) {
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if (bd->js_blocks && bd->raw_other) {
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int32_t *left, *right;
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if (raw_other > raw_samples) { // D = R - L
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if (bd->raw_other > raw_samples) { // D = R - L
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left = raw_samples;
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right = raw_other;
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right = bd->raw_other;
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} else { // D = R - L
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left = raw_other;
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left = bd->raw_other;
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right = raw_samples;
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}
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@ -713,24 +770,24 @@ static int read_var_block(ALSDecContext *ctx, unsigned int ra_block,
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}
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// reconstruct shifted signal
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if (*shift_lsbs)
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if (bd->shift_lsbs)
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for (sb = -1; sb >= -sconf->max_order; sb--)
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raw_samples[sb] >>= *shift_lsbs;
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raw_samples[sb] >>= bd->shift_lsbs;
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}
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// reconstruct raw samples
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for (; smp < block_length; smp++) {
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for (; smp < bd->block_length; smp++) {
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y = 1 << 19;
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for (sb = 0; sb < opt_order; sb++)
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y += MUL64(lpc_cof[sb],raw_samples[smp - (sb + 1)]);
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y += MUL64(bd->lpc_cof[sb],raw_samples[smp - (sb + 1)]);
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raw_samples[smp] -= y >> 20;
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}
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// restore previous samples in case that they have been altered
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if (store_prev_samples)
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memcpy(raw_samples - sconf->max_order, ctx->prev_raw_samples,
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if (bd->store_prev_samples)
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memcpy(raw_samples - sconf->max_order, bd->prev_raw_samples,
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sizeof(*raw_samples) * sconf->max_order);
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return 0;
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@ -739,37 +796,61 @@ static int read_var_block(ALSDecContext *ctx, unsigned int ra_block,
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/** Reads the block data.
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*/
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static int read_block_data(ALSDecContext *ctx, unsigned int ra_block,
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int32_t *raw_samples, unsigned int block_length,
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unsigned int *js_blocks, int32_t *raw_other)
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static int read_block(ALSDecContext *ctx, ALSBlockData *bd)
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{
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ALSSpecificConfig *sconf = &ctx->sconf;
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GetBitContext *gb = &ctx->gb;
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unsigned int shift_lsbs = 0;
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unsigned int k;
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// read block type flag and read the samples accordingly
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if (get_bits1(gb)) {
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if (read_var_block(ctx, ra_block, raw_samples, block_length, js_blocks,
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raw_other, &shift_lsbs))
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if (read_var_block_data(ctx, bd))
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return -1;
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} else {
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read_const_block(ctx, raw_samples, block_length, js_blocks);
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read_const_block_data(ctx, bd);
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}
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return 0;
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}
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/** Decodes the block data.
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*/
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static int decode_block(ALSDecContext *ctx, ALSBlockData *bd)
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{
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unsigned int smp;
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// read block type flag and read the samples accordingly
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if (bd->const_block)
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decode_const_block_data(ctx, bd);
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else if (decode_var_block_data(ctx, bd))
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return -1;
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// TODO: read RLSLMS extension data
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if (!sconf->mc_coding || ctx->js_switch)
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align_get_bits(gb);
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if (shift_lsbs)
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for (k = 0; k < block_length; k++)
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raw_samples[k] <<= shift_lsbs;
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if (bd->shift_lsbs)
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for (smp = 0; smp < bd->block_length; smp++)
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bd->raw_samples[smp] <<= bd->shift_lsbs;
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return 0;
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}
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/** Reads and decodes block data successively.
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*/
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static int read_decode_block(ALSDecContext *ctx, ALSBlockData *bd)
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{
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int ret;
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ret = read_block(ctx, bd);
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if (ret)
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return ret;
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ret = decode_block(ctx, bd);
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return ret;
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}
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/** Computes the number of samples left to decode for the current frame and
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* sets these samples to zero.
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*/
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@ -792,19 +873,32 @@ static int decode_blocks_ind(ALSDecContext *ctx, unsigned int ra_frame,
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unsigned int c, const unsigned int *div_blocks,
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unsigned int *js_blocks)
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{
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int32_t *raw_sample;
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unsigned int b;
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raw_sample = ctx->raw_samples[c];
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ALSBlockData bd;
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memset(&bd, 0, sizeof(ALSBlockData));
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bd.ra_block = ra_frame;
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bd.use_ltp = ctx->use_ltp;
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||||
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.prev_raw_samples = ctx->prev_raw_samples;
|
||||
bd.raw_samples = ctx->raw_samples[c];
|
||||
|
||||
|
||||
for (b = 0; b < ctx->num_blocks; b++) {
|
||||
if (read_block_data(ctx, ra_frame, raw_sample,
|
||||
div_blocks[b], &js_blocks[0], NULL)) {
|
||||
bd.shift_lsbs = 0;
|
||||
bd.block_length = div_blocks[b];
|
||||
|
||||
if (read_decode_block(ctx, &bd)) {
|
||||
// damaged block, write zero for the rest of the frame
|
||||
zero_remaining(b, ctx->num_blocks, div_blocks, raw_sample);
|
||||
zero_remaining(b, ctx->num_blocks, div_blocks, bd.raw_samples);
|
||||
return -1;
|
||||
}
|
||||
raw_sample += div_blocks[b];
|
||||
ra_frame = 0;
|
||||
bd.raw_samples += div_blocks[b];
|
||||
bd.ra_block = 0;
|
||||
}
|
||||
|
||||
return 0;
|
||||
@ -819,39 +913,67 @@ static int decode_blocks(ALSDecContext *ctx, unsigned int ra_frame,
|
||||
{
|
||||
ALSSpecificConfig *sconf = &ctx->sconf;
|
||||
unsigned int offset = 0;
|
||||
int32_t *raw_samples_R;
|
||||
int32_t *raw_samples_L;
|
||||
unsigned int b;
|
||||
ALSBlockData bd[2];
|
||||
|
||||
memset(bd, 0, 2 * sizeof(ALSBlockData));
|
||||
|
||||
bd[0].ra_block = ra_frame;
|
||||
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].prev_raw_samples = ctx->prev_raw_samples;
|
||||
bd[0].js_blocks = *js_blocks;
|
||||
|
||||
bd[1].ra_block = ra_frame;
|
||||
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].prev_raw_samples = ctx->prev_raw_samples;
|
||||
bd[1].js_blocks = *(js_blocks + 1);
|
||||
|
||||
// decode all blocks
|
||||
for (b = 0; b < ctx->num_blocks; b++) {
|
||||
unsigned int s;
|
||||
raw_samples_L = ctx->raw_samples[c ] + offset;
|
||||
raw_samples_R = ctx->raw_samples[c + 1] + offset;
|
||||
if (read_block_data(ctx, ra_frame, raw_samples_L, div_blocks[b],
|
||||
&js_blocks[0], raw_samples_R) ||
|
||||
read_block_data(ctx, ra_frame, raw_samples_R, div_blocks[b],
|
||||
&js_blocks[1], raw_samples_L)) {
|
||||
|
||||
bd[0].shift_lsbs = 0;
|
||||
bd[1].shift_lsbs = 0;
|
||||
|
||||
bd[0].block_length = div_blocks[b];
|
||||
bd[1].block_length = div_blocks[b];
|
||||
|
||||
bd[0].raw_samples = ctx->raw_samples[c ] + offset;
|
||||
bd[1].raw_samples = ctx->raw_samples[c + 1] + offset;
|
||||
|
||||
bd[0].raw_other = bd[1].raw_samples;
|
||||
bd[1].raw_other = bd[0].raw_samples;
|
||||
|
||||
if(read_decode_block(ctx, &bd[0]) || read_decode_block(ctx, &bd[1])) {
|
||||
// damaged block, write zero for the rest of the frame
|
||||
zero_remaining(b, ctx->num_blocks, div_blocks, raw_samples_L);
|
||||
zero_remaining(b, ctx->num_blocks, div_blocks, raw_samples_R);
|
||||
zero_remaining(b, ctx->num_blocks, div_blocks, bd[0].raw_samples);
|
||||
zero_remaining(b, ctx->num_blocks, div_blocks, bd[1].raw_samples);
|
||||
return -1;
|
||||
}
|
||||
|
||||
// reconstruct joint-stereo blocks
|
||||
if (js_blocks[0]) {
|
||||
if (js_blocks[1])
|
||||
if (bd[0].js_blocks) {
|
||||
if (bd[1].js_blocks)
|
||||
av_log(ctx->avctx, AV_LOG_WARNING, "Invalid channel pair!\n");
|
||||
|
||||
for (s = 0; s < div_blocks[b]; s++)
|
||||
raw_samples_L[s] = raw_samples_R[s] - raw_samples_L[s];
|
||||
} else if (js_blocks[1]) {
|
||||
bd[0].raw_samples[s] = bd[1].raw_samples[s] - bd[0].raw_samples[s];
|
||||
} else if (bd[1].js_blocks) {
|
||||
for (s = 0; s < div_blocks[b]; s++)
|
||||
raw_samples_R[s] = raw_samples_R[s] + raw_samples_L[s];
|
||||
bd[1].raw_samples[s] = bd[1].raw_samples[s] + bd[0].raw_samples[s];
|
||||
}
|
||||
|
||||
offset += div_blocks[b];
|
||||
ra_frame = 0;
|
||||
bd[0].ra_block = 0;
|
||||
bd[1].ra_block = 0;
|
||||
}
|
||||
|
||||
// store carryover raw samples,
|
||||
@ -1015,6 +1137,10 @@ static av_cold int decode_end(AVCodecContext *avctx)
|
||||
|
||||
av_freep(&ctx->sconf.chan_pos);
|
||||
|
||||
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->prev_raw_samples);
|
||||
@ -1031,6 +1157,7 @@ static av_cold int decode_init(AVCodecContext *avctx)
|
||||
{
|
||||
unsigned int c;
|
||||
unsigned int channel_size;
|
||||
int num_buffers;
|
||||
ALSDecContext *ctx = avctx->priv_data;
|
||||
ALSSpecificConfig *sconf = &ctx->sconf;
|
||||
ctx->avctx = avctx;
|
||||
@ -1064,6 +1191,26 @@ static av_cold int decode_init(AVCodecContext *avctx)
|
||||
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;
|
||||
|
||||
// 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);
|
||||
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 ||
|
||||
!ctx->ltp_gain || !ctx->ltp_gain_buffer) {
|
||||
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->ltp_gain[c] = ctx->ltp_gain_buffer + c * 5;
|
||||
|
||||
avctx->frame_size = sconf->frame_length;
|
||||
channel_size = sconf->frame_length + sconf->max_order;
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user