WavPack hybrid mode support
Originally committed as revision 16643 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Kostya Shishkov
parent
bef01ca08f
commit
2c96535af7
@ -28,9 +28,15 @@
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* WavPack lossless audio decoder
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*/
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#define WV_MONO 0x00000004
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#define WV_JOINT_STEREO 0x00000010
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#define WV_FALSE_STEREO 0x40000000
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#define WV_HYBRID_MODE 0x00000008
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#define WV_HYBRID_SHAPE 0x00000008
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#define WV_HYBRID_BITRATE 0x00000200
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#define WV_HYBRID_BALANCE 0x00000400
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enum WP_ID_Flags{
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WP_IDF_MASK = 0x1F,
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WP_IDF_IGNORE = 0x20,
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@ -66,19 +72,27 @@ typedef struct Decorr {
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int samplesB[8];
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} Decorr;
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typedef struct WvChannel {
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int median[3];
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int slow_level, error_limit;
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int bitrate_acc, bitrate_delta;
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} WvChannel;
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typedef struct WavpackContext {
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AVCodecContext *avctx;
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int frame_flags;
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int stereo, stereo_in;
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int joint;
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uint32_t CRC;
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GetBitContext gb;
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int data_size; // in bits
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int samples;
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int median[6];
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int terms;
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Decorr decorr[MAX_TERMS];
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int zero, one, zeroes;
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int and, or, shift;
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int hybrid, hybrid_bitrate;
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WvChannel ch[2];
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} WavpackContext;
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// exponent table copied from WavPack source
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@ -101,6 +115,25 @@ static const uint8_t wp_exp2_table [256] = {
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0xea, 0xec, 0xed, 0xee, 0xf0, 0xf1, 0xf2, 0xf4, 0xf5, 0xf6, 0xf8, 0xf9, 0xfa, 0xfc, 0xfd, 0xff
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};
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static const uint8_t wp_log2_table [] = {
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0x00, 0x01, 0x03, 0x04, 0x06, 0x07, 0x09, 0x0a, 0x0b, 0x0d, 0x0e, 0x10, 0x11, 0x12, 0x14, 0x15,
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0x16, 0x18, 0x19, 0x1a, 0x1c, 0x1d, 0x1e, 0x20, 0x21, 0x22, 0x24, 0x25, 0x26, 0x28, 0x29, 0x2a,
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0x2c, 0x2d, 0x2e, 0x2f, 0x31, 0x32, 0x33, 0x34, 0x36, 0x37, 0x38, 0x39, 0x3b, 0x3c, 0x3d, 0x3e,
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0x3f, 0x41, 0x42, 0x43, 0x44, 0x45, 0x47, 0x48, 0x49, 0x4a, 0x4b, 0x4d, 0x4e, 0x4f, 0x50, 0x51,
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0x52, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5a, 0x5c, 0x5d, 0x5e, 0x5f, 0x60, 0x61, 0x62, 0x63,
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0x64, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, 0x70, 0x71, 0x72, 0x74, 0x75,
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0x76, 0x77, 0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, 0x80, 0x81, 0x82, 0x83, 0x84, 0x85,
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0x86, 0x87, 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, 0x90, 0x91, 0x92, 0x93, 0x94, 0x95,
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0x96, 0x97, 0x98, 0x99, 0x9a, 0x9b, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f, 0xa0, 0xa1, 0xa2, 0xa3, 0xa4,
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0xa5, 0xa6, 0xa7, 0xa8, 0xa9, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf, 0xb0, 0xb1, 0xb2, 0xb2,
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0xb3, 0xb4, 0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf, 0xc0, 0xc0,
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0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xcb, 0xcb, 0xcc, 0xcd, 0xce,
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0xcf, 0xd0, 0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd8, 0xd9, 0xda, 0xdb,
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0xdc, 0xdc, 0xdd, 0xde, 0xdf, 0xe0, 0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe4, 0xe5, 0xe6, 0xe7, 0xe7,
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0xe8, 0xe9, 0xea, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xee, 0xef, 0xf0, 0xf1, 0xf1, 0xf2, 0xf3, 0xf4,
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0xf4, 0xf5, 0xf6, 0xf7, 0xf7, 0xf8, 0xf9, 0xf9, 0xfa, 0xfb, 0xfc, 0xfc, 0xfd, 0xfe, 0xff, 0xff
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};
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static av_always_inline int wp_exp2(int16_t val)
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{
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int res, neg = 0;
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@ -116,10 +149,28 @@ static av_always_inline int wp_exp2(int16_t val)
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return neg ? -res : res;
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}
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static av_always_inline int wp_log2(int32_t val)
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{
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int bits;
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if(!val)
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return 0;
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if(val == 1)
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return 256;
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val += val >> 9;
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bits = av_log2(val) + 1;
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if(bits < 9)
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return (bits << 8) + wp_log2_table[(val << (9 - bits)) & 0xFF];
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else
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return (bits << 8) + wp_log2_table[(val >> (bits - 9)) & 0xFF];
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}
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#define LEVEL_DECAY(a) ((a + 0x80) >> 8)
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// macros for manipulating median values
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#define GET_MED(n) ((median[n] >> 4) + 1)
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#define DEC_MED(n) median[n] -= ((median[n] + (128>>n) - 2) / (128>>n)) * 2
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#define INC_MED(n) median[n] += ((median[n] + (128>>n)) / (128>>n)) * 5
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#define GET_MED(n) ((c->median[n] >> 4) + 1)
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#define DEC_MED(n) c->median[n] -= ((c->median[n] + (128>>n) - 2) / (128>>n)) * 2
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#define INC_MED(n) c->median[n] += ((c->median[n] + (128>>n)) / (128>>n)) * 5
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// macros for applying weight
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#define UPDATE_WEIGHT_CLIP(weight, delta, samples, in) \
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@ -148,24 +199,63 @@ static av_always_inline int get_tail(GetBitContext *gb, int k)
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return res;
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}
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static int wv_get_value(WavpackContext *ctx, GetBitContext *gb, int *median, int *last)
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static void update_error_limit(WavpackContext *ctx)
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{
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int i, br[2], sl[2];
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for(i = 0; i <= ctx->stereo_in; i++){
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ctx->ch[i].bitrate_acc += ctx->ch[i].bitrate_delta;
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br[i] = ctx->ch[i].bitrate_acc >> 16;
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sl[i] = LEVEL_DECAY(ctx->ch[i].slow_level);
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}
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if(ctx->stereo_in && ctx->hybrid_bitrate){
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int balance = (sl[1] - sl[0] + br[1] + 1) >> 1;
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if(balance > br[0]){
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br[1] = br[0] << 1;
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br[0] = 0;
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}else if(-balance > br[0]){
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br[0] <<= 1;
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br[1] = 0;
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}else{
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br[1] = br[0] + balance;
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br[0] = br[0] - balance;
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}
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}
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for(i = 0; i <= ctx->stereo_in; i++){
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if(ctx->hybrid_bitrate){
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if(sl[i] - br[i] > -0x100)
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ctx->ch[i].error_limit = wp_exp2(sl[i] - br[i] + 0x100);
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else
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ctx->ch[i].error_limit = 0;
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}else{
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ctx->ch[i].error_limit = wp_exp2(br[i]);
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}
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}
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}
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static int wv_get_value(WavpackContext *ctx, GetBitContext *gb, int channel, int *last)
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{
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int t, t2;
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int sign, base, add, ret;
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WvChannel *c = &ctx->ch[channel];
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*last = 0;
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if((ctx->median[0] < 2U) && (ctx->median[3] < 2U) && !ctx->zero && !ctx->one){
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if((ctx->ch[0].median[0] < 2U) && (ctx->ch[1].median[0] < 2U) && !ctx->zero && !ctx->one){
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if(ctx->zeroes){
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ctx->zeroes--;
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if(ctx->zeroes)
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if(ctx->zeroes){
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c->slow_level -= LEVEL_DECAY(c->slow_level);
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return 0;
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}
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}else{
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t = get_unary_0_33(gb);
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if(t >= 2) t = get_bits(gb, t - 1) | (1 << (t-1));
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ctx->zeroes = t;
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if(ctx->zeroes){
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memset(ctx->median, 0, sizeof(ctx->median));
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memset(ctx->ch[0].median, 0, sizeof(ctx->ch[0].median));
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memset(ctx->ch[1].median, 0, sizeof(ctx->ch[1].median));
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c->slow_level -= LEVEL_DECAY(c->slow_level);
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return 0;
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}
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}
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@ -201,6 +291,9 @@ static int wv_get_value(WavpackContext *ctx, GetBitContext *gb, int *median, int
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ctx->zero = !ctx->one;
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}
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if(ctx->hybrid && !channel)
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update_error_limit(ctx);
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if(!t){
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base = 0;
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add = GET_MED(0) - 1;
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@ -223,8 +316,23 @@ static int wv_get_value(WavpackContext *ctx, GetBitContext *gb, int *median, int
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INC_MED(1);
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INC_MED(2);
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}
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ret = base + get_tail(gb, add);
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if(!c->error_limit){
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ret = base + get_tail(gb, add);
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}else{
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int mid = (base*2 + add + 1) >> 1;
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while(add > c->error_limit){
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if(get_bits1(gb)){
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add -= (mid - base);
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base = mid;
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}else
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add = mid - base - 1;
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mid = (base*2 + add + 1) >> 1;
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}
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ret = mid;
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}
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sign = get_bits1(gb);
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if(ctx->hybrid_bitrate)
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c->slow_level += wp_log2(ret) - LEVEL_DECAY(c->slow_level);
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return sign ? ~ret : ret;
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}
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@ -238,9 +346,9 @@ static int wv_unpack_stereo(WavpackContext *s, GetBitContext *gb, int16_t *dst)
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s->one = s->zero = s->zeroes = 0;
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do{
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L = wv_get_value(s, gb, s->median, &last);
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L = wv_get_value(s, gb, 0, &last);
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if(last) break;
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R = wv_get_value(s, gb, s->median + 3, &last);
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R = wv_get_value(s, gb, 1, &last);
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if(last) break;
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for(i = 0; i < s->terms; i++){
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t = s->decorr[i].value;
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@ -320,7 +428,7 @@ static int wv_unpack_mono(WavpackContext *s, GetBitContext *gb, int16_t *dst)
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s->one = s->zero = s->zeroes = 0;
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do{
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T = wv_get_value(s, gb, s->median, &last);
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T = wv_get_value(s, gb, 0, &last);
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S = 0;
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if(last) break;
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for(i = 0; i < s->terms; i++){
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@ -374,6 +482,7 @@ static int wavpack_decode_frame(AVCodecContext *avctx,
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int16_t *samples = data;
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int samplecount;
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int got_terms = 0, got_weights = 0, got_samples = 0, got_entropy = 0, got_bs = 0;
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int got_hybrid = 0;
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const uint8_t* buf_end = buf + buf_size;
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int i, j, id, size, ssize, weights, t;
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@ -383,7 +492,7 @@ static int wavpack_decode_frame(AVCodecContext *avctx,
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}
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memset(s->decorr, 0, MAX_TERMS * sizeof(Decorr));
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memset(s->median, 0, sizeof(s->median));
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memset(s->ch, 0, sizeof(s->ch));
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s->and = s->or = s->shift = 0;
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s->samples = AV_RL32(buf); buf += 4;
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@ -396,8 +505,11 @@ static int wavpack_decode_frame(AVCodecContext *avctx,
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av_log(avctx, AV_LOG_ERROR, "Packet size is too big to be handled in lavc!\n");
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return -1;
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}
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s->stereo_in = (AV_RL32(buf) & WV_FALSE_STEREO) ? 0 : s->stereo;
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s->joint = AV_RL32(buf) & WV_JOINT_STEREO; buf += 4;
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s->frame_flags = AV_RL32(buf); buf += 4;
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s->stereo_in = (s->frame_flags & WV_FALSE_STEREO) ? 0 : s->stereo;
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s->joint = s->frame_flags & WV_JOINT_STEREO;
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s->hybrid = s->frame_flags & WV_HYBRID_MODE;
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s->hybrid_bitrate = s->frame_flags & WV_HYBRID_BITRATE;
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s->CRC = AV_RL32(buf); buf += 4;
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// parse metadata blocks
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while(buf < buf_end){
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@ -500,12 +612,38 @@ static int wavpack_decode_frame(AVCodecContext *avctx,
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buf += ssize;
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continue;
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}
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for(i = 0; i < 3 * (s->stereo_in + 1); i++){
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s->median[i] = wp_exp2(AV_RL16(buf));
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buf += 2;
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for(j = 0; j <= s->stereo_in; j++){
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for(i = 0; i < 3; i++){
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s->ch[j].median[i] = wp_exp2(AV_RL16(buf));
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buf += 2;
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}
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}
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got_entropy = 1;
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break;
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case WP_ID_HYBRID:
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if(s->hybrid_bitrate){
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for(i = 0; i <= s->stereo_in; i++){
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s->ch[i].slow_level = wp_exp2(AV_RL16(buf));
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buf += 2;
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size -= 2;
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}
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}
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for(i = 0; i < (s->stereo_in + 1); i++){
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s->ch[i].bitrate_acc = AV_RL16(buf) << 16;
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buf += 2;
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size -= 2;
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}
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if(size > 0){
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for(i = 0; i < (s->stereo_in + 1); i++){
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s->ch[i].bitrate_delta = wp_exp2((int16_t)AV_RL16(buf));
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buf += 2;
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}
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}else{
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for(i = 0; i < (s->stereo_in + 1); i++)
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s->ch[i].bitrate_delta = 0;
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}
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got_hybrid = 1;
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break;
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case WP_ID_INT32INFO:
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if(size != 4 || *buf){
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av_log(avctx, AV_LOG_ERROR, "Invalid INT32INFO, size = %i, sent_bits = %i\n", size, *buf);
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@ -550,6 +688,10 @@ static int wavpack_decode_frame(AVCodecContext *avctx,
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av_log(avctx, AV_LOG_ERROR, "No block with entropy info\n");
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return -1;
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}
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if(s->hybrid && !got_hybrid){
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av_log(avctx, AV_LOG_ERROR, "Hybrid config not found\n");
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return -1;
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}
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if(!got_bs){
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av_log(avctx, AV_LOG_ERROR, "Packed samples not found\n");
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return -1;
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@ -100,10 +100,6 @@ static int wv_read_block_header(AVFormatContext *ctx, ByteIOContext *pb)
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av_log(ctx, AV_LOG_ERROR, "Floating point data is not supported\n");
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return -1;
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}
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if(wc->flags & WV_HYBRID){
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av_log(ctx, AV_LOG_ERROR, "Hybrid coding mode is not supported\n");
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return -1;
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}
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bpp = ((wc->flags & 3) + 1) << 3;
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chan = 1 + !(wc->flags & WV_MONO);
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