ffmpeg/FFmpeg
1
0
Fork 0
mirror of https://git.ffmpeg.org/ffmpeg.git synced 2024-09-20 05:16:38 +00:00
Code Issues Packages Projects Releases Wiki Activity

mlpdec: Split channel parameters from context into their own struct.

Browse Source 
Originally committed as revision 14720 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Ramiro Polla 2008-08-13 01:36:01 +00:00
parent 557ac0c448
commit f53acb7b17
1 changed files with 46 additions and 38 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

84
libavcodec/mlpdec.c
View File

@ -153,6 +153,20 @@ typedef struct {
int32_t state[MAX_FILTER_ORDER];
} FilterParams;
/** sample data coding information */
typedef struct {
FilterParams filter_params[NUM_FILTERS];
//! Offset to apply to residual values.
int16_t huff_offset;
//! sign/rounding-corrected version of huff_offset
int32_t sign_huff_offset;
//! Which VLC codebook to use to read residuals.
uint8_t codebook;
//! Size of residual suffix not encoded using VLC.
uint8_t huff_lsbs;
} ChannelParams;
typedef struct MLPDecodeContext {
AVCodecContext *avctx;
@ -172,19 +186,7 @@ typedef struct MLPDecodeContext {
SubStream substream[MAX_SUBSTREAMS];
FilterParams filter_params[MAX_CHANNELS][NUM_FILTERS];
//@{
/** sample data coding information */
//! Offset to apply to residual values.
int16_t huff_offset[MAX_CHANNELS];
//! sign/rounding-corrected version of huff_offset
int32_t sign_huff_offset[MAX_CHANNELS];
//! Which VLC codebook to use to read residuals.
uint8_t codebook[MAX_CHANNELS];
//! Size of residual suffix not encoded using VLC.
uint8_t huff_lsbs[MAX_CHANNELS];
//@}
ChannelParams channel_params[MAX_CHANNELS];
int8_t noise_buffer[MAX_BLOCKSIZE_POW2];
int8_t bypassed_lsbs[MAX_BLOCKSIZE][MAX_CHANNELS];
@ -278,12 +280,13 @@ static uint8_t mlp_restart_checksum(const uint8_t *buf, unsigned int bit_size)
static inline int32_t calculate_sign_huff(MLPDecodeContext *m,
unsigned int substr, unsigned int ch)
{
ChannelParams *cp = &m->channel_params[ch];
SubStream *s = &m->substream[substr];
int lsb_bits = m->huff_lsbs[ch] - s->quant_step_size[ch];
int sign_shift = lsb_bits + (m->codebook[ch] ? 2 - m->codebook[ch] : -1);
int32_t sign_huff_offset = m->huff_offset[ch];
int lsb_bits = cp->huff_lsbs - s->quant_step_size[ch];
int sign_shift = lsb_bits + (cp->codebook ? 2 - cp->codebook : -1);
int32_t sign_huff_offset = cp->huff_offset;
if (m->codebook[ch] > 0)
if (cp->codebook > 0)
sign_huff_offset -= 7 << lsb_bits;
if (sign_shift >= 0)
@ -306,9 +309,10 @@ static inline int read_huff_channels(MLPDecodeContext *m, GetBitContext *gbp,
m->bypassed_lsbs[pos + s->blockpos][mat] = get_bits1(gbp);
for (channel = s->min_channel; channel <= s->max_channel; channel++) {
int codebook = m->codebook[channel];
ChannelParams *cp = &m->channel_params[channel];
int codebook = cp->codebook;
int quant_step_size = s->quant_step_size[channel];
int lsb_bits = m->huff_lsbs[channel] - quant_step_size;
int lsb_bits = cp->huff_lsbs - quant_step_size;
int result = 0;
if (codebook > 0)
@ -321,7 +325,7 @@ static inline int read_huff_channels(MLPDecodeContext *m, GetBitContext *gbp,
if (lsb_bits > 0)
result = (result << lsb_bits) + get_bits(gbp, lsb_bits);
result += m->sign_huff_offset[channel];
result += cp->sign_huff_offset;
result <<= quant_step_size;
m->sample_buffer[pos + s->blockpos][channel] = result;
@ -523,16 +527,17 @@ static int read_restart_header(MLPDecodeContext *m, GetBitContext *gbp,
memset(s->quant_step_size, 0, sizeof(s->quant_step_size));
for (ch = s->min_channel; ch <= s->max_channel; ch++) {
m->filter_params[ch][FIR].order = 0;
m->filter_params[ch][IIR].order = 0;
m->filter_params[ch][FIR].shift = 0;
m->filter_params[ch][IIR].shift = 0;
ChannelParams *cp = &m->channel_params[ch];
cp->filter_params[FIR].order = 0;
cp->filter_params[IIR].order = 0;
cp->filter_params[FIR].shift = 0;
cp->filter_params[IIR].shift = 0;
/* Default audio coding is 24-bit raw PCM. */
m->huff_offset [ch] = 0;
m->sign_huff_offset[ch] = (-1) << 23;
m->codebook [ch] = 0;
m->huff_lsbs [ch] = 24;
cp->huff_offset = 0;
cp->sign_huff_offset = (-1) << 23;
cp->codebook = 0;
cp->huff_lsbs = 24;
}
if (substr == m->max_decoded_substream) {
@ -547,7 +552,7 @@ static int read_restart_header(MLPDecodeContext *m, GetBitContext *gbp,
static int read_filter_params(MLPDecodeContext *m, GetBitContext *gbp,
unsigned int channel, unsigned int filter)
{
FilterParams *fp = &m->filter_params[channel][filter];
FilterParams *fp = &m->channel_params[channel].filter_params[filter];
const char fchar = filter ? 'I' : 'F';
int i, order;
@ -683,16 +688,19 @@ static int read_decoding_params(MLPDecodeContext *m, GetBitContext *gbp,
if (s->param_presence_flags & PARAM_QUANTSTEP)
if (get_bits1(gbp))
for (ch = 0; ch <= s->max_channel; ch++) {
ChannelParams *cp = &m->channel_params[ch];
s->quant_step_size[ch] = get_bits(gbp, 4);
/* TODO: validate */
m->sign_huff_offset[ch] = calculate_sign_huff(m, substr, ch);
cp->sign_huff_offset = calculate_sign_huff(m, substr, ch);
}
for (ch = s->min_channel; ch <= s->max_channel; ch++)
if (get_bits1(gbp)) {
FilterParams *fir = &m->filter_params[ch][FIR];
FilterParams *iir = &m->filter_params[ch][IIR];
ChannelParams *cp = &m->channel_params[ch];
FilterParams *fir = &cp->filter_params[FIR];
FilterParams *iir = &cp->filter_params[IIR];
if (s->param_presence_flags & PARAM_FIR)
if (get_bits1(gbp))
@ -720,12 +728,12 @@ static int read_decoding_params(MLPDecodeContext *m, GetBitContext *gbp,
if (s->param_presence_flags & PARAM_HUFFOFFSET)
if (get_bits1(gbp))
m->huff_offset[ch] = get_sbits(gbp, 15);
cp->huff_offset = get_sbits(gbp, 15);
m->codebook [ch] = get_bits(gbp, 2);
m->huff_lsbs[ch] = get_bits(gbp, 5);
cp->codebook = get_bits(gbp, 2);
cp->huff_lsbs = get_bits(gbp, 5);
m->sign_huff_offset[ch] = calculate_sign_huff(m, substr, ch);
cp->sign_huff_offset = calculate_sign_huff(m, substr, ch);
/* TODO: validate */
}
@ -743,8 +751,8 @@ static void filter_channel(MLPDecodeContext *m, unsigned int substr,
{
SubStream *s = &m->substream[substr];
int32_t filter_state_buffer[NUM_FILTERS][MAX_BLOCKSIZE + MAX_FILTER_ORDER];
FilterParams *fp[NUM_FILTERS] = { &m->filter_params[channel][FIR],
&m->filter_params[channel][IIR], };
FilterParams *fp[NUM_FILTERS] = { &m->channel_params[channel].filter_params[FIR],
&m->channel_params[channel].filter_params[IIR], };
unsigned int filter_shift = fp[FIR]->shift;
int32_t mask = MSB_MASK(s->quant_step_size[channel]);
int index = MAX_BLOCKSIZE;