40 #define SAMPLES_PER_BAND 36
41 #define MPC_FRAME_SIZE (BANDS * SAMPLES_PER_BAND)
47 0, 512, 1024, 1536, 2052, 2564, 3076, 3588, 4100, 4612, 5124,
48 5636, 6164, 6676, 7224
58 static int vlc_initialized = 0;
63 static VLC_TYPE quant_tables[7224][2];
101 if(vlc_initialized)
return 0;
103 scfi_vlc.
table = scfi_table;
111 dscf_vlc.
table = dscf_table;
119 hdr_vlc.
table = hdr_table;
128 for(j = 0; j < 2; j++){
130 quant_vlc[i][j].
table_allocated = quant_offsets[i*2 + j + 1] - quant_offsets[i*2 + j];
161 for(i = 0; i < SAMPLES_PER_BAND/3; i++){
162 t =
get_vlc2(gb, quant_vlc[0][i1].table, 9, 2);
170 for(i = 0; i < SAMPLES_PER_BAND/2; i++){
171 t =
get_vlc2(gb, quant_vlc[1][i1].table, 9, 2);
176 case 3:
case 4:
case 5:
case 6:
case 7:
181 case 8:
case 9:
case 10:
case 11:
case 12:
182 case 13:
case 14:
case 15:
case 16:
case 17:
183 t = (1 << (idx - 2)) - 1;
197 return av_clip_uintp2(ref + t, 7);
201 int *got_frame_ptr,
AVPacket *avpkt)
203 const uint8_t *buf = avpkt->
data;
204 int buf_size = avpkt->
size;
212 int bits_used, bits_avail;
214 memset(bands, 0,
sizeof(*bands) * (c->
maxbands + 1));
228 c->
dsp.
bswap_buf((uint32_t*)bits, (
const uint32_t*)(buf + 4), (buf_size - 4) >> 2);
234 for(ch = 0; ch < 2; ch++){
238 else bands[i].
res[ch] = av_clip(bands[i-1].res[ch] + t, 0, 17);
241 if(bands[i].res[0] || bands[i].res[1]){
247 for(i = 0; i <= mb; i++)
248 for(ch = 0; ch < 2; ch++)
251 for(i = 0; i <= mb; i++){
252 for(ch = 0; ch < 2; ch++){
253 if(bands[i].res[ch]){
256 switch(bands[i].scfi[ch]){
278 memset(c->
Q, 0,
sizeof(c->
Q));
281 for(ch = 0; ch < 2; ch++)
289 bits_avail = (buf_size - 4) * 8;
290 if(!buf[1] && ((bits_avail < bits_used) || (bits_used + 32 <= bits_avail))){
291 av_log(
NULL,0,
"Error decoding frame: used %i of %i bits\n", bits_used, bits_avail);
static const int8_t mpc7_idx32[]
static const uint16_t mpc7_quant_vlc[MPC7_QUANT_VLC_TABLES][2][64 *2]
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
static void skip_bits_long(GetBitContext *s, int n)
AVFrame * coded_frame
the picture in the bitstream
#define AV_CH_LAYOUT_STEREO
static const uint8_t mpc7_quant_vlc_sizes[MPC7_QUANT_VLC_TABLES *2]
static int mpc7_decode_frame(AVCodecContext *avctx, void *data, int *got_frame_ptr, AVPacket *avpkt)
static int decode(MimicContext *ctx, int quality, int num_coeffs, int is_iframe)
enum AVSampleFormat sample_fmt
audio sample format
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
static int get_bits_count(const GetBitContext *s)
bitstream reader API header.
static const int8_t mpc7_idx50[]
av_cold void dsputil_init(DSPContext *c, AVCodecContext *avctx)
static int init(AVCodecParserContext *s)
audio conversion routines
#define CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
static const int8_t mpc7_idx31[]
void av_free(void *ptr)
Free a memory block which has been allocated with av_malloc(z)() or av_realloc(). ...
static const uint8_t mpc7_hdr[MPC7_HDR_SIZE *2]
void(* bswap_buf)(uint32_t *dst, const uint32_t *src, int w)
#define MPC7_QUANT_VLC_TABLES
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
static const uint8_t mpc7_quant_vlc_off[MPC7_QUANT_VLC_TABLES]
void av_log(void *avcl, int level, const char *fmt,...)
const char * name
Name of the codec implementation.
static const uint8_t mpc7_scfi[MPC7_SCFI_SIZE *2]
uint64_t channel_layout
Audio channel layout.
void ff_mpadsp_init(MPADSPContext *s)
static av_cold int mpc7_decode_init(AVCodecContext *avctx)
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame)
static void mpc7_decode_flush(AVCodecContext *avctx)
static av_always_inline int get_vlc2(GetBitContext *s, VLC_TYPE(*table)[2], int bits, int max_depth)
Parse a vlc code.
#define INIT_VLC_USE_NEW_STATIC
#define AVERROR_PATCHWELCOME
Not yet implemented in Libav, patches welcome.
Musepack decoder MPEG Audio Layer 1/2 -like codec with frames of 1152 samples divided into 32 subband...
static const int8_t mpc7_idx51[]
void av_log_ask_for_sample(void *avc, const char *msg,...) av_printf_format(2
Log a generic warning message asking for a sample.
main external API structure.
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
static void idx_to_quant(MPCContext *c, GetBitContext *gb, int idx, int *dst)
Fill samples for given subband.
void ff_mpc_dequantize_and_synth(MPCContext *c, int maxband, void *data, int channels)
#define init_vlc(vlc, nb_bits, nb_codes,bits, bits_wrap, bits_size,codes, codes_wrap, codes_size,flags)
static unsigned int av_lfg_get(AVLFG *c)
Get the next random unsigned 32-bit number using an ALFG.
static unsigned int get_bits1(GetBitContext *s)
void * av_malloc(size_t size)
Allocate a block of size bytes with alignment suitable for all memory accesses (including vectors if ...
static int init_get_bits(GetBitContext *s, const uint8_t *buffer, int bit_size)
Initialize GetBitContext.
#define FF_INPUT_BUFFER_PADDING_SIZE
Required number of additionally allocated bytes at the end of the input bitstream for decoding...
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
common internal api header.
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
static av_cold void flush(AVCodecContext *avctx)
Flush (reset) the frame ID after seeking.
void av_cold av_lfg_init(AVLFG *c, unsigned int seed)
static const uint16_t quant_offsets[MPC7_QUANT_VLC_TABLES *2+1]
static const int8_t mpc7_idx30[]
int channels
number of audio channels
VLC_TYPE(* table)[2]
code, bits
void avcodec_get_frame_defaults(AVFrame *pic)
Set the fields of the given AVFrame to default values.
static const uint8_t mpc7_dscf[MPC7_DSCF_SIZE *2]
static int get_scale_idx(GetBitContext *gb, int ref)
Subband structure - hold all variables for each subband.
int nb_samples
number of audio samples (per channel) described by this frame
static VLC quant_vlc[MPC7_QUANT_VLC_TABLES][2]