cosmetics: rename ac3 decoder variables
Originally committed as revision 11197 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Justin Ruggles
parent
e59cc20593
commit
e2270b4e1e
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@ -65,16 +65,16 @@ static float b5_mantissas[16];
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* Quantization table: levels for symmetric. bits for asymmetric.
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* reference: Table 7.18 Mapping of bap to Quantizer
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*/
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static const uint8_t qntztab[16] = {
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static const uint8_t quantization_tab[16] = {
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0, 3, 5, 7, 11, 15,
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5, 6, 7, 8, 9, 10, 11, 12, 14, 16
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};
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/** dynamic range table. converts codes to scale factors. */
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static float dynrng_tab[256];
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static float dynamic_range_tab[256];
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/** dialog normalization table */
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static float dialnorm_tab[32];
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static float dialog_norm_tab[32];
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/** Adjustments in dB gain */
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#define LEVEL_MINUS_3DB 0.7071067811865476
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@ -130,17 +130,17 @@ static const uint8_t ac3_default_coeffs[8][5][2] = {
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typedef struct {
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int channel_mode; ///< channel mode (acmod)
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int dolby_surround_mode; ///< dolby surround mode
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int blksw[AC3_MAX_CHANNELS]; ///< block switch flags
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int dithflag[AC3_MAX_CHANNELS]; ///< dither flags
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int block_switch[AC3_MAX_CHANNELS]; ///< block switch flags
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int dither_flag[AC3_MAX_CHANNELS]; ///< dither flags
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int dither_all; ///< true if all channels are dithered
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int cplinu; ///< coupling in use
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int chincpl[AC3_MAX_CHANNELS]; ///< channel in coupling
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int phsflginu; ///< phase flags in use
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int cplbndstrc[18]; ///< coupling band structure
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int rematstr; ///< rematrixing strategy
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int nrematbnd; ///< number of rematrixing bands
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int rematflg[4]; ///< rematrixing flags
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int expstr[AC3_MAX_CHANNELS]; ///< exponent strategies
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int cpl_in_use; ///< coupling in use
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int channel_in_cpl[AC3_MAX_CHANNELS]; ///< channel in coupling
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int phase_flags_in_use; ///< phase flags in use
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int cpl_band_struct[18]; ///< coupling band structure
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int rematrixing_strategy; ///< rematrixing strategy
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int num_rematrixing_bands; ///< number of rematrixing bands
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int rematrixing_flags[4]; ///< rematrixing flags
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int exp_strategy[AC3_MAX_CHANNELS]; ///< exponent strategies
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int snr_offset[AC3_MAX_CHANNELS]; ///< signal-to-noise ratio offsets
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int fast_gain[AC3_MAX_CHANNELS]; ///< fast gain values (signal-to-mask ratio)
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int dba_mode[AC3_MAX_CHANNELS]; ///< delta bit allocation mode
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@ -153,21 +153,21 @@ typedef struct {
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int bit_rate; ///< stream bit rate, in bits-per-second
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int frame_size; ///< current frame size, in bytes
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int nchans; ///< number of total channels
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int nfchans; ///< number of full-bandwidth channels
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int channels; ///< number of total channels
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int fbw_channels; ///< number of full-bandwidth channels
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int lfe_on; ///< lfe channel in use
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int lfe_ch; ///< index of LFE channel
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int output_mode; ///< output channel configuration
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int out_channels; ///< number of output channels
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float downmix_coeffs[AC3_MAX_CHANNELS][2]; ///< stereo downmix coefficients
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float dialnorm[2]; ///< dialog normalization
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float dynrng[2]; ///< dynamic range
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float cplco[AC3_MAX_CHANNELS][18]; ///< coupling coordinates
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int ncplbnd; ///< number of coupling bands
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int ncplsubnd; ///< number of coupling sub bands
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int startmant[AC3_MAX_CHANNELS]; ///< start frequency bin
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int endmant[AC3_MAX_CHANNELS]; ///< end frequency bin
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float dialog_norm[2]; ///< dialog normalization
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float dynamic_range[2]; ///< dynamic range
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float cpl_coords[AC3_MAX_CHANNELS][18]; ///< coupling coordinates
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int num_cpl_bands; ///< number of coupling bands
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int num_cpl_subbands; ///< number of coupling sub bands
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int start_freq[AC3_MAX_CHANNELS]; ///< start frequency bin
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int end_freq[AC3_MAX_CHANNELS]; ///< end frequency bin
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AC3BitAllocParameters bit_alloc_params; ///< bit allocation parameters
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int8_t dexps[AC3_MAX_CHANNELS][256]; ///< decoded exponents
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@ -273,16 +273,16 @@ static void ac3_tables_init(void)
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reference: Section 7.7.1 Dynamic Range Control */
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for(i=0; i<256; i++) {
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int v = (i >> 5) - ((i >> 7) << 3) - 5;
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dynrng_tab[i] = powf(2.0f, v) * ((i & 0x1F) | 0x20);
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dynamic_range_tab[i] = powf(2.0f, v) * ((i & 0x1F) | 0x20);
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}
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/* generate dialog normalization table
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references: Section 5.4.2.8 dialnorm
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Section 7.6 Dialogue Normalization */
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for(i=1; i<32; i++) {
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dialnorm_tab[i] = expf((i-31) * M_LN10 / 20.0f);
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dialog_norm_tab[i] = expf((i-31) * M_LN10 / 20.0f);
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}
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dialnorm_tab[0] = dialnorm_tab[31];
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dialog_norm_tab[0] = dialog_norm_tab[31];
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/* generate scale factors for exponents and asymmetrical dequantization
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reference: Section 7.3.2 Expansion of Mantissas for Asymmetric Quantization */
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@ -353,13 +353,13 @@ static int ac3_parse_header(AC3DecodeContext *ctx)
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ctx->bit_alloc_params.sr_shift = hdr.sr_shift;
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ctx->sampling_rate = hdr.sample_rate;
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ctx->bit_rate = hdr.bit_rate;
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ctx->nchans = hdr.channels;
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ctx->nfchans = ctx->nchans - ctx->lfe_on;
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ctx->lfe_ch = ctx->nfchans + 1;
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ctx->channels = hdr.channels;
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ctx->fbw_channels = ctx->channels - ctx->lfe_on;
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ctx->lfe_ch = ctx->fbw_channels + 1;
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ctx->frame_size = hdr.frame_size;
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/* set default output to all source channels */
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ctx->out_channels = ctx->nchans;
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ctx->out_channels = ctx->channels;
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ctx->output_mode = ctx->channel_mode;
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if(ctx->lfe_on)
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ctx->output_mode |= AC3_OUTPUT_LFEON;
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@ -382,7 +382,7 @@ static int ac3_parse_header(AC3DecodeContext *ctx)
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/* read the rest of the bsi. read twice for dual mono mode. */
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i = !(ctx->channel_mode);
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do {
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ctx->dialnorm[i] = dialnorm_tab[get_bits(gb, 5)]; // dialog normalization
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ctx->dialog_norm[i] = dialog_norm_tab[get_bits(gb, 5)]; // dialog normalization
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if (get_bits1(gb))
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skip_bits(gb, 8); //skip compression
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if (get_bits1(gb))
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@ -410,7 +410,7 @@ static int ac3_parse_header(AC3DecodeContext *ctx)
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/* set stereo downmixing coefficients
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reference: Section 7.8.2 Downmixing Into Two Channels */
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for(i=0; i<ctx->nfchans; i++) {
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for(i=0; i<ctx->fbw_channels; i++) {
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ctx->downmix_coeffs[i][0] = gain_levels[ac3_default_coeffs[ctx->channel_mode][i][0]];
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ctx->downmix_coeffs[i][1] = gain_levels[ac3_default_coeffs[ctx->channel_mode][i][1]];
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}
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@ -433,15 +433,15 @@ static int ac3_parse_header(AC3DecodeContext *ctx)
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* Decode the grouped exponents according to exponent strategy.
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* reference: Section 7.1.3 Exponent Decoding
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*/
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static void decode_exponents(GetBitContext *gb, int expstr, int ngrps,
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static void decode_exponents(GetBitContext *gb, int exp_strategy, int ngrps,
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uint8_t absexp, int8_t *dexps)
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{
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int i, j, grp, grpsize;
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int i, j, grp, group_size;
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int dexp[256];
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int expacc, prevexp;
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/* unpack groups */
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grpsize = expstr + (expstr == EXP_D45);
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group_size = exp_strategy + (exp_strategy == EXP_D45);
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for(grp=0,i=0; grp<ngrps; grp++) {
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expacc = get_bits(gb, 7);
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dexp[i++] = exp_ungroup_tab[expacc][0];
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@ -453,8 +453,8 @@ static void decode_exponents(GetBitContext *gb, int expstr, int ngrps,
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prevexp = absexp;
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for(i=0; i<ngrps*3; i++) {
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prevexp = av_clip(prevexp + dexp[i]-2, 0, 24);
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for(j=0; j<grpsize; j++) {
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dexps[(i*grpsize)+j] = prevexp;
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for(j=0; j<group_size; j++) {
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dexps[(i*group_size)+j] = prevexp;
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}
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}
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}
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@ -469,18 +469,18 @@ static void uncouple_channels(AC3DecodeContext *ctx)
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int i, j, ch, bnd, subbnd;
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subbnd = -1;
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i = ctx->startmant[CPL_CH];
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for(bnd=0; bnd<ctx->ncplbnd; bnd++) {
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i = ctx->start_freq[CPL_CH];
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for(bnd=0; bnd<ctx->num_cpl_bands; bnd++) {
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do {
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subbnd++;
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for(j=0; j<12; j++) {
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for(ch=1; ch<=ctx->nfchans; ch++) {
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if(ctx->chincpl[ch])
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ctx->transform_coeffs[ch][i] = ctx->transform_coeffs[CPL_CH][i] * ctx->cplco[ch][bnd] * 8.0f;
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for(ch=1; ch<=ctx->fbw_channels; ch++) {
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if(ctx->channel_in_cpl[ch])
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ctx->transform_coeffs[ch][i] = ctx->transform_coeffs[CPL_CH][i] * ctx->cpl_coords[ch][bnd] * 8.0f;
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}
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i++;
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}
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} while(ctx->cplbndstrc[subbnd]);
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} while(ctx->cpl_band_struct[subbnd]);
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}
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}
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@ -511,8 +511,8 @@ static int get_transform_coeffs_ch(AC3DecodeContext *ctx, int ch_index, mant_gro
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exps = ctx->dexps[ch_index];
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bap = ctx->bap[ch_index];
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coeffs = ctx->transform_coeffs[ch_index];
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start = ctx->startmant[ch_index];
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end = ctx->endmant[ch_index];
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start = ctx->start_freq[ch_index];
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end = ctx->end_freq[ch_index];
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for (i = start; i < end; i++) {
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tbap = bap[i];
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@ -563,7 +563,7 @@ static int get_transform_coeffs_ch(AC3DecodeContext *ctx, int ch_index, mant_gro
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default:
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/* asymmetric dequantization */
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coeffs[i] = get_sbits(gb, qntztab[tbap]) * scale_factors[qntztab[tbap]-1];
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coeffs[i] = get_sbits(gb, quantization_tab[tbap]) * scale_factors[quantization_tab[tbap]-1];
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break;
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}
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coeffs[i] *= scale_factors[exps[i]];
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@ -582,21 +582,21 @@ static void remove_dithering(AC3DecodeContext *ctx) {
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float *coeffs;
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uint8_t *bap;
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for(ch=1; ch<=ctx->nfchans; ch++) {
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if(!ctx->dithflag[ch]) {
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for(ch=1; ch<=ctx->fbw_channels; ch++) {
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if(!ctx->dither_flag[ch]) {
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coeffs = ctx->transform_coeffs[ch];
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bap = ctx->bap[ch];
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if(ctx->chincpl[ch])
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end = ctx->startmant[CPL_CH];
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if(ctx->channel_in_cpl[ch])
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end = ctx->start_freq[CPL_CH];
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else
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end = ctx->endmant[ch];
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end = ctx->end_freq[ch];
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for(i=0; i<end; i++) {
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if(bap[i] == 0)
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coeffs[i] = 0.0f;
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}
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if(ctx->chincpl[ch]) {
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if(ctx->channel_in_cpl[ch]) {
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bap = ctx->bap[CPL_CH];
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for(; i<ctx->endmant[CPL_CH]; i++) {
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for(; i<ctx->end_freq[CPL_CH]; i++) {
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if(bap[i] == 0)
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coeffs[i] = 0.0f;
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}
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@ -616,13 +616,13 @@ static int get_transform_coeffs(AC3DecodeContext * ctx)
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m.b1ptr = m.b2ptr = m.b4ptr = 3;
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for (ch = 1; ch <= ctx->nchans; ch++) {
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for (ch = 1; ch <= ctx->channels; ch++) {
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/* transform coefficients for full-bandwidth channel */
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if (get_transform_coeffs_ch(ctx, ch, &m))
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return -1;
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/* tranform coefficients for coupling channel come right after the
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coefficients for the first coupled channel*/
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if (ctx->chincpl[ch]) {
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if (ctx->channel_in_cpl[ch]) {
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if (!got_cplchan) {
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if (get_transform_coeffs_ch(ctx, CPL_CH, &m)) {
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av_log(ctx->avctx, AV_LOG_ERROR, "error in decoupling channels\n");
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@ -631,9 +631,9 @@ static int get_transform_coeffs(AC3DecodeContext * ctx)
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uncouple_channels(ctx);
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got_cplchan = 1;
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}
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end = ctx->endmant[CPL_CH];
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end = ctx->end_freq[CPL_CH];
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} else {
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end = ctx->endmant[ch];
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end = ctx->end_freq[ch];
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}
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do
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ctx->transform_coeffs[ch][end] = 0;
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@ -657,10 +657,10 @@ static void do_rematrixing(AC3DecodeContext *ctx)
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int end, bndend;
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float tmp0, tmp1;
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end = FFMIN(ctx->endmant[1], ctx->endmant[2]);
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end = FFMIN(ctx->end_freq[1], ctx->end_freq[2]);
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for(bnd=0; bnd<ctx->nrematbnd; bnd++) {
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if(ctx->rematflg[bnd]) {
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for(bnd=0; bnd<ctx->num_rematrixing_bands; bnd++) {
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if(ctx->rematrixing_flags[bnd]) {
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bndend = FFMIN(end, rematrix_band_tab[bnd+1]);
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for(i=rematrix_band_tab[bnd]; i<bndend; i++) {
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tmp0 = ctx->transform_coeffs[1][i];
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@ -721,15 +721,15 @@ static void do_imdct_256(AC3DecodeContext *ctx, int chindex)
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static inline void do_imdct(AC3DecodeContext *ctx)
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{
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int ch;
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int nchans;
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int channels;
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/* Don't perform the IMDCT on the LFE channel unless it's used in the output */
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nchans = ctx->nfchans;
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channels = ctx->fbw_channels;
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if(ctx->output_mode & AC3_OUTPUT_LFEON)
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nchans++;
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channels++;
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for (ch=1; ch<=nchans; ch++) {
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if (ctx->blksw[ch]) {
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for (ch=1; ch<=channels; ch++) {
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if (ctx->block_switch[ch]) {
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do_imdct_256(ctx, ch);
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} else {
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ctx->imdct_512.fft.imdct_calc(&ctx->imdct_512, ctx->tmp_output,
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@ -750,7 +750,7 @@ static inline void do_imdct(AC3DecodeContext *ctx)
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/**
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* Downmix the output to mono or stereo.
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*/
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static void ac3_downmix(float samples[AC3_MAX_CHANNELS][256], int nfchans,
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static void ac3_downmix(float samples[AC3_MAX_CHANNELS][256], int fbw_channels,
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int output_mode, float coef[AC3_MAX_CHANNELS][2])
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{
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int i, j;
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@ -758,7 +758,7 @@ static void ac3_downmix(float samples[AC3_MAX_CHANNELS][256], int nfchans,
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for(i=0; i<256; i++) {
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v0 = v1 = s0 = s1 = 0.0f;
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for(j=0; j<nfchans; j++) {
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for(j=0; j<fbw_channels; j++) {
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v0 += samples[j][i] * coef[j][0];
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v1 += samples[j][i] * coef[j][1];
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s0 += coef[j][0];
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@ -780,7 +780,7 @@ static void ac3_downmix(float samples[AC3_MAX_CHANNELS][256], int nfchans,
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*/
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static int ac3_parse_audio_block(AC3DecodeContext *ctx, int blk)
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{
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int nfchans = ctx->nfchans;
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int fbw_channels = ctx->fbw_channels;
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int channel_mode = ctx->channel_mode;
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int i, bnd, seg, ch;
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GetBitContext *gb = &ctx->gb;
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@ -789,14 +789,14 @@ static int ac3_parse_audio_block(AC3DecodeContext *ctx, int blk)
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memset(bit_alloc_stages, 0, AC3_MAX_CHANNELS);
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/* block switch flags */
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for (ch = 1; ch <= nfchans; ch++)
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ctx->blksw[ch] = get_bits1(gb);
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for (ch = 1; ch <= fbw_channels; ch++)
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ctx->block_switch[ch] = get_bits1(gb);
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/* dithering flags */
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ctx->dither_all = 1;
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for (ch = 1; ch <= nfchans; ch++) {
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ctx->dithflag[ch] = get_bits1(gb);
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if(!ctx->dithflag[ch])
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for (ch = 1; ch <= fbw_channels; ch++) {
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ctx->dither_flag[ch] = get_bits1(gb);
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if(!ctx->dither_flag[ch])
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ctx->dither_all = 0;
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}
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@ -804,142 +804,142 @@ static int ac3_parse_audio_block(AC3DecodeContext *ctx, int blk)
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i = !(ctx->channel_mode);
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do {
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if(get_bits1(gb)) {
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ctx->dynrng[i] = dynrng_tab[get_bits(gb, 8)];
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ctx->dynamic_range[i] = dynamic_range_tab[get_bits(gb, 8)];
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} else if(blk == 0) {
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ctx->dynrng[i] = 1.0f;
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ctx->dynamic_range[i] = 1.0f;
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}
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} while(i--);
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/* coupling strategy */
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if (get_bits1(gb)) {
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memset(bit_alloc_stages, 3, AC3_MAX_CHANNELS);
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ctx->cplinu = get_bits1(gb);
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if (ctx->cplinu) {
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ctx->cpl_in_use = get_bits1(gb);
|
||||
if (ctx->cpl_in_use) {
|
||||
/* coupling in use */
|
||||
int cplbegf, cplendf;
|
||||
int cpl_begin_freq, cpl_end_freq;
|
||||
|
||||
/* determine which channels are coupled */
|
||||
for (ch = 1; ch <= nfchans; ch++)
|
||||
ctx->chincpl[ch] = get_bits1(gb);
|
||||
for (ch = 1; ch <= fbw_channels; ch++)
|
||||
ctx->channel_in_cpl[ch] = get_bits1(gb);
|
||||
|
||||
/* phase flags in use */
|
||||
if (channel_mode == AC3_CHMODE_STEREO)
|
||||
ctx->phsflginu = get_bits1(gb);
|
||||
ctx->phase_flags_in_use = get_bits1(gb);
|
||||
|
||||
/* coupling frequency range and band structure */
|
||||
cplbegf = get_bits(gb, 4);
|
||||
cplendf = get_bits(gb, 4);
|
||||
if (3 + cplendf - cplbegf < 0) {
|
||||
av_log(ctx->avctx, AV_LOG_ERROR, "cplendf = %d < cplbegf = %d\n", cplendf, cplbegf);
|
||||
cpl_begin_freq = get_bits(gb, 4);
|
||||
cpl_end_freq = get_bits(gb, 4);
|
||||
if (3 + cpl_end_freq - cpl_begin_freq < 0) {
|
||||
av_log(ctx->avctx, AV_LOG_ERROR, "3+cplendf = %d < cplbegf = %d\n", 3+cpl_end_freq, cpl_begin_freq);
|
||||
return -1;
|
||||
}
|
||||
ctx->ncplbnd = ctx->ncplsubnd = 3 + cplendf - cplbegf;
|
||||
ctx->startmant[CPL_CH] = cplbegf * 12 + 37;
|
||||
ctx->endmant[CPL_CH] = cplendf * 12 + 73;
|
||||
for (bnd = 0; bnd < ctx->ncplsubnd - 1; bnd++) {
|
||||
ctx->num_cpl_bands = ctx->num_cpl_subbands = 3 + cpl_end_freq - cpl_begin_freq;
|
||||
ctx->start_freq[CPL_CH] = cpl_begin_freq * 12 + 37;
|
||||
ctx->end_freq[CPL_CH] = cpl_end_freq * 12 + 73;
|
||||
for (bnd = 0; bnd < ctx->num_cpl_subbands - 1; bnd++) {
|
||||
if (get_bits1(gb)) {
|
||||
ctx->cplbndstrc[bnd] = 1;
|
||||
ctx->ncplbnd--;
|
||||
ctx->cpl_band_struct[bnd] = 1;
|
||||
ctx->num_cpl_bands--;
|
||||
}
|
||||
}
|
||||
} else {
|
||||
/* coupling not in use */
|
||||
for (ch = 1; ch <= nfchans; ch++)
|
||||
ctx->chincpl[ch] = 0;
|
||||
for (ch = 1; ch <= fbw_channels; ch++)
|
||||
ctx->channel_in_cpl[ch] = 0;
|
||||
}
|
||||
}
|
||||
|
||||
/* coupling coordinates */
|
||||
if (ctx->cplinu) {
|
||||
int cplcoe = 0;
|
||||
if (ctx->cpl_in_use) {
|
||||
int cpl_coords_exist = 0;
|
||||
|
||||
for (ch = 1; ch <= nfchans; ch++) {
|
||||
if (ctx->chincpl[ch]) {
|
||||
for (ch = 1; ch <= fbw_channels; ch++) {
|
||||
if (ctx->channel_in_cpl[ch]) {
|
||||
if (get_bits1(gb)) {
|
||||
int mstrcplco, cplcoexp, cplcomant;
|
||||
cplcoe = 1;
|
||||
mstrcplco = 3 * get_bits(gb, 2);
|
||||
for (bnd = 0; bnd < ctx->ncplbnd; bnd++) {
|
||||
cplcoexp = get_bits(gb, 4);
|
||||
cplcomant = get_bits(gb, 4);
|
||||
if (cplcoexp == 15)
|
||||
ctx->cplco[ch][bnd] = cplcomant / 16.0f;
|
||||
int master_cpl_coord, cpl_coord_exp, cpl_coord_mant;
|
||||
cpl_coords_exist = 1;
|
||||
master_cpl_coord = 3 * get_bits(gb, 2);
|
||||
for (bnd = 0; bnd < ctx->num_cpl_bands; bnd++) {
|
||||
cpl_coord_exp = get_bits(gb, 4);
|
||||
cpl_coord_mant = get_bits(gb, 4);
|
||||
if (cpl_coord_exp == 15)
|
||||
ctx->cpl_coords[ch][bnd] = cpl_coord_mant / 16.0f;
|
||||
else
|
||||
ctx->cplco[ch][bnd] = (cplcomant + 16.0f) / 32.0f;
|
||||
ctx->cplco[ch][bnd] *= scale_factors[cplcoexp + mstrcplco];
|
||||
ctx->cpl_coords[ch][bnd] = (cpl_coord_mant + 16.0f) / 32.0f;
|
||||
ctx->cpl_coords[ch][bnd] *= scale_factors[cpl_coord_exp + master_cpl_coord];
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
/* phase flags */
|
||||
if (channel_mode == AC3_CHMODE_STEREO && ctx->phsflginu && cplcoe) {
|
||||
for (bnd = 0; bnd < ctx->ncplbnd; bnd++) {
|
||||
if (channel_mode == AC3_CHMODE_STEREO && ctx->phase_flags_in_use && cpl_coords_exist) {
|
||||
for (bnd = 0; bnd < ctx->num_cpl_bands; bnd++) {
|
||||
if (get_bits1(gb))
|
||||
ctx->cplco[2][bnd] = -ctx->cplco[2][bnd];
|
||||
ctx->cpl_coords[2][bnd] = -ctx->cpl_coords[2][bnd];
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/* stereo rematrixing strategy and band structure */
|
||||
if (channel_mode == AC3_CHMODE_STEREO) {
|
||||
ctx->rematstr = get_bits1(gb);
|
||||
if (ctx->rematstr) {
|
||||
ctx->nrematbnd = 4;
|
||||
if(ctx->cplinu && ctx->startmant[CPL_CH] <= 61)
|
||||
ctx->nrematbnd -= 1 + (ctx->startmant[CPL_CH] == 37);
|
||||
for(bnd=0; bnd<ctx->nrematbnd; bnd++)
|
||||
ctx->rematflg[bnd] = get_bits1(gb);
|
||||
ctx->rematrixing_strategy = get_bits1(gb);
|
||||
if (ctx->rematrixing_strategy) {
|
||||
ctx->num_rematrixing_bands = 4;
|
||||
if(ctx->cpl_in_use && ctx->start_freq[CPL_CH] <= 61)
|
||||
ctx->num_rematrixing_bands -= 1 + (ctx->start_freq[CPL_CH] == 37);
|
||||
for(bnd=0; bnd<ctx->num_rematrixing_bands; bnd++)
|
||||
ctx->rematrixing_flags[bnd] = get_bits1(gb);
|
||||
}
|
||||
}
|
||||
|
||||
/* exponent strategies for each channel */
|
||||
ctx->expstr[CPL_CH] = EXP_REUSE;
|
||||
ctx->expstr[ctx->lfe_ch] = EXP_REUSE;
|
||||
for (ch = !ctx->cplinu; ch <= ctx->nchans; ch++) {
|
||||
ctx->exp_strategy[CPL_CH] = EXP_REUSE;
|
||||
ctx->exp_strategy[ctx->lfe_ch] = EXP_REUSE;
|
||||
for (ch = !ctx->cpl_in_use; ch <= ctx->channels; ch++) {
|
||||
if(ch == ctx->lfe_ch)
|
||||
ctx->expstr[ch] = get_bits(gb, 1);
|
||||
ctx->exp_strategy[ch] = get_bits(gb, 1);
|
||||
else
|
||||
ctx->expstr[ch] = get_bits(gb, 2);
|
||||
if(ctx->expstr[ch] != EXP_REUSE)
|
||||
ctx->exp_strategy[ch] = get_bits(gb, 2);
|
||||
if(ctx->exp_strategy[ch] != EXP_REUSE)
|
||||
bit_alloc_stages[ch] = 3;
|
||||
}
|
||||
|
||||
/* channel bandwidth */
|
||||
for (ch = 1; ch <= nfchans; ch++) {
|
||||
ctx->startmant[ch] = 0;
|
||||
if (ctx->expstr[ch] != EXP_REUSE) {
|
||||
int prev = ctx->endmant[ch];
|
||||
if (ctx->chincpl[ch])
|
||||
ctx->endmant[ch] = ctx->startmant[CPL_CH];
|
||||
for (ch = 1; ch <= fbw_channels; ch++) {
|
||||
ctx->start_freq[ch] = 0;
|
||||
if (ctx->exp_strategy[ch] != EXP_REUSE) {
|
||||
int prev = ctx->end_freq[ch];
|
||||
if (ctx->channel_in_cpl[ch])
|
||||
ctx->end_freq[ch] = ctx->start_freq[CPL_CH];
|
||||
else {
|
||||
int chbwcod = get_bits(gb, 6);
|
||||
if (chbwcod > 60) {
|
||||
av_log(ctx->avctx, AV_LOG_ERROR, "chbwcod = %d > 60", chbwcod);
|
||||
int bandwidth_code = get_bits(gb, 6);
|
||||
if (bandwidth_code > 60) {
|
||||
av_log(ctx->avctx, AV_LOG_ERROR, "bandwidth code = %d > 60", bandwidth_code);
|
||||
return -1;
|
||||
}
|
||||
ctx->endmant[ch] = chbwcod * 3 + 73;
|
||||
ctx->end_freq[ch] = bandwidth_code * 3 + 73;
|
||||
}
|
||||
if(blk > 0 && ctx->endmant[ch] != prev)
|
||||
if(blk > 0 && ctx->end_freq[ch] != prev)
|
||||
memset(bit_alloc_stages, 3, AC3_MAX_CHANNELS);
|
||||
}
|
||||
}
|
||||
ctx->startmant[ctx->lfe_ch] = 0;
|
||||
ctx->endmant[ctx->lfe_ch] = 7;
|
||||
ctx->start_freq[ctx->lfe_ch] = 0;
|
||||
ctx->end_freq[ctx->lfe_ch] = 7;
|
||||
|
||||
/* decode exponents for each channel */
|
||||
for (ch = !ctx->cplinu; ch <= ctx->nchans; ch++) {
|
||||
if (ctx->expstr[ch] != EXP_REUSE) {
|
||||
int grpsize, ngrps;
|
||||
grpsize = 3 << (ctx->expstr[ch] - 1);
|
||||
for (ch = !ctx->cpl_in_use; ch <= ctx->channels; ch++) {
|
||||
if (ctx->exp_strategy[ch] != EXP_REUSE) {
|
||||
int group_size, num_groups;
|
||||
group_size = 3 << (ctx->exp_strategy[ch] - 1);
|
||||
if(ch == CPL_CH)
|
||||
ngrps = (ctx->endmant[ch] - ctx->startmant[ch]) / grpsize;
|
||||
num_groups = (ctx->end_freq[ch] - ctx->start_freq[ch]) / group_size;
|
||||
else if(ch == ctx->lfe_ch)
|
||||
ngrps = 2;
|
||||
num_groups = 2;
|
||||
else
|
||||
ngrps = (ctx->endmant[ch] + grpsize - 4) / grpsize;
|
||||
num_groups = (ctx->end_freq[ch] + group_size - 4) / group_size;
|
||||
ctx->dexps[ch][0] = get_bits(gb, 4) << !ch;
|
||||
decode_exponents(gb, ctx->expstr[ch], ngrps, ctx->dexps[ch][0],
|
||||
&ctx->dexps[ch][ctx->startmant[ch]+!!ch]);
|
||||
decode_exponents(gb, ctx->exp_strategy[ch], num_groups, ctx->dexps[ch][0],
|
||||
&ctx->dexps[ch][ctx->start_freq[ch]+!!ch]);
|
||||
if(ch != CPL_CH && ch != ctx->lfe_ch)
|
||||
skip_bits(gb, 2); /* skip gainrng */
|
||||
}
|
||||
|
|
@ -952,7 +952,7 @@ static int ac3_parse_audio_block(AC3DecodeContext *ctx, int blk)
|
|||
ctx->bit_alloc_params.slow_gain = ff_ac3_slow_gain_tab[get_bits(gb, 2)];
|
||||
ctx->bit_alloc_params.db_per_bit = ff_ac3_db_per_bit_tab[get_bits(gb, 2)];
|
||||
ctx->bit_alloc_params.floor = ff_ac3_floor_tab[get_bits(gb, 3)];
|
||||
for(ch=!ctx->cplinu; ch<=ctx->nchans; ch++) {
|
||||
for(ch=!ctx->cpl_in_use; ch<=ctx->channels; ch++) {
|
||||
bit_alloc_stages[ch] = FFMAX(bit_alloc_stages[ch], 2);
|
||||
}
|
||||
}
|
||||
|
|
@ -961,7 +961,7 @@ static int ac3_parse_audio_block(AC3DecodeContext *ctx, int blk)
|
|||
if (get_bits1(gb)) {
|
||||
int csnr;
|
||||
csnr = (get_bits(gb, 6) - 15) << 4;
|
||||
for (ch = !ctx->cplinu; ch <= ctx->nchans; ch++) { /* snr offset and fast gain */
|
||||
for (ch = !ctx->cpl_in_use; ch <= ctx->channels; ch++) { /* snr offset and fast gain */
|
||||
ctx->snr_offset[ch] = (csnr + get_bits(gb, 4)) << 2;
|
||||
ctx->fast_gain[ch] = ff_ac3_fast_gain_tab[get_bits(gb, 3)];
|
||||
}
|
||||
|
|
@ -969,7 +969,7 @@ static int ac3_parse_audio_block(AC3DecodeContext *ctx, int blk)
|
|||
}
|
||||
|
||||
/* coupling leak information */
|
||||
if (ctx->cplinu && get_bits1(gb)) {
|
||||
if (ctx->cpl_in_use && get_bits1(gb)) {
|
||||
ctx->bit_alloc_params.cpl_fast_leak = get_bits(gb, 3);
|
||||
ctx->bit_alloc_params.cpl_slow_leak = get_bits(gb, 3);
|
||||
bit_alloc_stages[CPL_CH] = FFMAX(bit_alloc_stages[CPL_CH], 2);
|
||||
|
|
@ -978,7 +978,7 @@ static int ac3_parse_audio_block(AC3DecodeContext *ctx, int blk)
|
|||
/* delta bit allocation information */
|
||||
if (get_bits1(gb)) {
|
||||
/* delta bit allocation exists (strategy) */
|
||||
for (ch = !ctx->cplinu; ch <= nfchans; ch++) {
|
||||
for (ch = !ctx->cpl_in_use; ch <= fbw_channels; ch++) {
|
||||
ctx->dba_mode[ch] = get_bits(gb, 2);
|
||||
if (ctx->dba_mode[ch] == DBA_RESERVED) {
|
||||
av_log(ctx->avctx, AV_LOG_ERROR, "delta bit allocation strategy reserved\n");
|
||||
|
|
@ -987,7 +987,7 @@ static int ac3_parse_audio_block(AC3DecodeContext *ctx, int blk)
|
|||
bit_alloc_stages[ch] = FFMAX(bit_alloc_stages[ch], 2);
|
||||
}
|
||||
/* channel delta offset, len and bit allocation */
|
||||
for (ch = !ctx->cplinu; ch <= nfchans; ch++) {
|
||||
for (ch = !ctx->cpl_in_use; ch <= fbw_channels; ch++) {
|
||||
if (ctx->dba_mode[ch] == DBA_NEW) {
|
||||
ctx->dba_nsegs[ch] = get_bits(gb, 3);
|
||||
for (seg = 0; seg <= ctx->dba_nsegs[ch]; seg++) {
|
||||
|
|
@ -998,24 +998,24 @@ static int ac3_parse_audio_block(AC3DecodeContext *ctx, int blk)
|
|||
}
|
||||
}
|
||||
} else if(blk == 0) {
|
||||
for(ch=0; ch<=ctx->nchans; ch++) {
|
||||
for(ch=0; ch<=ctx->channels; ch++) {
|
||||
ctx->dba_mode[ch] = DBA_NONE;
|
||||
}
|
||||
}
|
||||
|
||||
/* Bit allocation */
|
||||
for(ch=!ctx->cplinu; ch<=ctx->nchans; ch++) {
|
||||
for(ch=!ctx->cpl_in_use; ch<=ctx->channels; ch++) {
|
||||
if(bit_alloc_stages[ch] > 2) {
|
||||
/* Exponent mapping into PSD and PSD integration */
|
||||
ff_ac3_bit_alloc_calc_psd(ctx->dexps[ch],
|
||||
ctx->startmant[ch], ctx->endmant[ch],
|
||||
ctx->start_freq[ch], ctx->end_freq[ch],
|
||||
ctx->psd[ch], ctx->band_psd[ch]);
|
||||
}
|
||||
if(bit_alloc_stages[ch] > 1) {
|
||||
/* Compute excitation function, Compute masking curve, and
|
||||
Apply delta bit allocation */
|
||||
ff_ac3_bit_alloc_calc_mask(&ctx->bit_alloc_params, ctx->band_psd[ch],
|
||||
ctx->startmant[ch], ctx->endmant[ch],
|
||||
ctx->start_freq[ch], ctx->end_freq[ch],
|
||||
ctx->fast_gain[ch], (ch == ctx->lfe_ch),
|
||||
ctx->dba_mode[ch], ctx->dba_nsegs[ch],
|
||||
ctx->dba_offsets[ch], ctx->dba_lengths[ch],
|
||||
|
|
@ -1024,7 +1024,7 @@ static int ac3_parse_audio_block(AC3DecodeContext *ctx, int blk)
|
|||
if(bit_alloc_stages[ch] > 0) {
|
||||
/* Compute bit allocation */
|
||||
ff_ac3_bit_alloc_calc_bap(ctx->mask[ch], ctx->psd[ch],
|
||||
ctx->startmant[ch], ctx->endmant[ch],
|
||||
ctx->start_freq[ch], ctx->end_freq[ch],
|
||||
ctx->snr_offset[ch],
|
||||
ctx->bit_alloc_params.floor,
|
||||
ctx->bap[ch]);
|
||||
|
|
@ -1050,14 +1050,14 @@ static int ac3_parse_audio_block(AC3DecodeContext *ctx, int blk)
|
|||
do_rematrixing(ctx);
|
||||
|
||||
/* apply scaling to coefficients (headroom, dialnorm, dynrng) */
|
||||
for(ch=1; ch<=ctx->nchans; ch++) {
|
||||
for(ch=1; ch<=ctx->channels; ch++) {
|
||||
float gain = 2.0f * ctx->mul_bias;
|
||||
if(ctx->channel_mode == AC3_CHMODE_DUALMONO) {
|
||||
gain *= ctx->dialnorm[ch-1] * ctx->dynrng[ch-1];
|
||||
gain *= ctx->dialog_norm[ch-1] * ctx->dynamic_range[ch-1];
|
||||
} else {
|
||||
gain *= ctx->dialnorm[0] * ctx->dynrng[0];
|
||||
gain *= ctx->dialog_norm[0] * ctx->dynamic_range[0];
|
||||
}
|
||||
for(i=0; i<ctx->endmant[ch]; i++) {
|
||||
for(i=0; i<ctx->end_freq[ch]; i++) {
|
||||
ctx->transform_coeffs[ch][i] *= gain;
|
||||
}
|
||||
}
|
||||
|
|
@ -1065,9 +1065,9 @@ static int ac3_parse_audio_block(AC3DecodeContext *ctx, int blk)
|
|||
do_imdct(ctx);
|
||||
|
||||
/* downmix output if needed */
|
||||
if(ctx->nchans != ctx->out_channels && !((ctx->output_mode & AC3_OUTPUT_LFEON) &&
|
||||
ctx->nfchans == ctx->out_channels)) {
|
||||
ac3_downmix(ctx->output, ctx->nfchans, ctx->output_mode,
|
||||
if(ctx->channels != ctx->out_channels && !((ctx->output_mode & AC3_OUTPUT_LFEON) &&
|
||||
ctx->fbw_channels == ctx->out_channels)) {
|
||||
ac3_downmix(ctx->output, ctx->fbw_channels, ctx->output_mode,
|
||||
ctx->downmix_coeffs);
|
||||
}
|
||||
|
||||
|
|
@ -1127,7 +1127,7 @@ static int ac3_decode_frame(AVCodecContext * avctx, void *data, int *data_size,
|
|||
}
|
||||
|
||||
/* channel config */
|
||||
ctx->out_channels = ctx->nchans;
|
||||
ctx->out_channels = ctx->channels;
|
||||
if (avctx->channels == 0) {
|
||||
avctx->channels = ctx->out_channels;
|
||||
} else if(ctx->out_channels < avctx->channels) {
|
||||
|
|
|
|||
Loading…
Reference in New Issue
Block a user