Chinese AVS decoder

[ffmpeg] / libavcodec / flac.c

diff --git a/libavcodec/flac.c b/libavcodec/flac.c
index d0efa16b46d888eeacb453659d30ac5406c008f9..8bf00b2d047ce5c26788fdaae6f44f28b847b867 100644 (file)
--- a/libavcodec/flac.c
+++ b/libavcodec/flac.c
@@ -36,6 +36,7 @@
 #include "avcodec.h"
 #include "bitstream.h"
 #include "golomb.h"
+#include "crc.h"
 
 #undef NDEBUG
 #include <assert.h>
@@ -66,7 +67,7 @@ typedef struct FLACContext {
     uint8_t *bitstream;
     int bitstream_size;
     int bitstream_index;
-    int allocated_bitstream_size;
+    unsigned int allocated_bitstream_size;
 } FLACContext;
 
 #define METADATA_TYPE_STREAMINFO 0
@@ -84,41 +85,6 @@ static int blocksize_table[] = {
 256<<0, 256<<1, 256<<2, 256<<3, 256<<4, 256<<5, 256<<6, 256<<7
 };
 
-static const uint8_t table_crc8[256] = {
-    0x00, 0x07, 0x0e, 0x09, 0x1c, 0x1b, 0x12, 0x15,
-    0x38, 0x3f, 0x36, 0x31, 0x24, 0x23, 0x2a, 0x2d,
-    0x70, 0x77, 0x7e, 0x79, 0x6c, 0x6b, 0x62, 0x65,
-    0x48, 0x4f, 0x46, 0x41, 0x54, 0x53, 0x5a, 0x5d,
-    0xe0, 0xe7, 0xee, 0xe9, 0xfc, 0xfb, 0xf2, 0xf5,
-    0xd8, 0xdf, 0xd6, 0xd1, 0xc4, 0xc3, 0xca, 0xcd,
-    0x90, 0x97, 0x9e, 0x99, 0x8c, 0x8b, 0x82, 0x85,
-    0xa8, 0xaf, 0xa6, 0xa1, 0xb4, 0xb3, 0xba, 0xbd,
-    0xc7, 0xc0, 0xc9, 0xce, 0xdb, 0xdc, 0xd5, 0xd2,
-    0xff, 0xf8, 0xf1, 0xf6, 0xe3, 0xe4, 0xed, 0xea,
-    0xb7, 0xb0, 0xb9, 0xbe, 0xab, 0xac, 0xa5, 0xa2,
-    0x8f, 0x88, 0x81, 0x86, 0x93, 0x94, 0x9d, 0x9a,
-    0x27, 0x20, 0x29, 0x2e, 0x3b, 0x3c, 0x35, 0x32,
-    0x1f, 0x18, 0x11, 0x16, 0x03, 0x04, 0x0d, 0x0a,
-    0x57, 0x50, 0x59, 0x5e, 0x4b, 0x4c, 0x45, 0x42,
-    0x6f, 0x68, 0x61, 0x66, 0x73, 0x74, 0x7d, 0x7a,
-    0x89, 0x8e, 0x87, 0x80, 0x95, 0x92, 0x9b, 0x9c,
-    0xb1, 0xb6, 0xbf, 0xb8, 0xad, 0xaa, 0xa3, 0xa4,
-    0xf9, 0xfe, 0xf7, 0xf0, 0xe5, 0xe2, 0xeb, 0xec,
-    0xc1, 0xc6, 0xcf, 0xc8, 0xdd, 0xda, 0xd3, 0xd4,
-    0x69, 0x6e, 0x67, 0x60, 0x75, 0x72, 0x7b, 0x7c,
-    0x51, 0x56, 0x5f, 0x58, 0x4d, 0x4a, 0x43, 0x44,
-    0x19, 0x1e, 0x17, 0x10, 0x05, 0x02, 0x0b, 0x0c,
-    0x21, 0x26, 0x2f, 0x28, 0x3d, 0x3a, 0x33, 0x34,
-    0x4e, 0x49, 0x40, 0x47, 0x52, 0x55, 0x5c, 0x5b,
-    0x76, 0x71, 0x78, 0x7f, 0x6a, 0x6d, 0x64, 0x63,
-    0x3e, 0x39, 0x30, 0x37, 0x22, 0x25, 0x2c, 0x2b,
-    0x06, 0x01, 0x08, 0x0f, 0x1a, 0x1d, 0x14, 0x13,
-    0xae, 0xa9, 0xa0, 0xa7, 0xb2, 0xb5, 0xbc, 0xbb,
-    0x96, 0x91, 0x98, 0x9f, 0x8a, 0x8d, 0x84, 0x83,
-    0xde, 0xd9, 0xd0, 0xd7, 0xc2, 0xc5, 0xcc, 0xcb,
-    0xe6, 0xe1, 0xe8, 0xef, 0xfa, 0xfd, 0xf4, 0xf3
-};
-
 static int64_t get_utf8(GetBitContext *gb)
 {
     uint64_t val;
@@ -166,17 +132,6 @@ static int skip_utf8(GetBitContext *gb)
 }
 #endif
 
-static int get_crc8(const uint8_t *buf, int count){
-    int crc=0;
-    int i;
-
-    for(i=0; i<count; i++){
-        crc = table_crc8[crc ^ buf[i]];
-    }
-
-    return crc;
-}
-
 static void metadata_streaminfo(FLACContext *s);
 static void dump_headers(FLACContext *s);
 
@@ -341,7 +296,7 @@ static int decode_subframe_fixed(FLACContext *s, int channel, int pred_order)
 
 static int decode_subframe_lpc(FLACContext *s, int channel, int pred_order)
 {
-    int sum, i, j;
+    int i, j;
     int coeff_prec, qlevel;
     int coeffs[pred_order];
 
@@ -379,12 +334,24 @@ static int decode_subframe_lpc(FLACContext *s, int channel, int pred_order)
     if (decode_residuals(s, channel, pred_order) < 0)
         return -1;
 
-    for (i = pred_order; i < s->blocksize; i++)
-    {
-        sum = 0;
-        for (j = 0; j < pred_order; j++)
-            sum += coeffs[j] * s->decoded[channel][i-j-1];
-        s->decoded[channel][i] += sum >> qlevel;
+    if (s->bps > 16) {
+        int64_t sum;
+        for (i = pred_order; i < s->blocksize; i++)
+        {
+            sum = 0;
+            for (j = 0; j < pred_order; j++)
+                sum += (int64_t)coeffs[j] * s->decoded[channel][i-j-1];
+            s->decoded[channel][i] += sum >> qlevel;
+        }
+    } else {
+        int sum;
+        for (i = pred_order; i < s->blocksize; i++)
+        {
+            sum = 0;
+            for (j = 0; j < pred_order; j++)
+                sum += coeffs[j] * s->decoded[channel][i-j-1];
+            s->decoded[channel][i] += sum >> qlevel;
+        }
     }
 
     return 0;
@@ -554,7 +521,7 @@ static int decode_frame(FLACContext *s)
     }
 
     skip_bits(&s->gb, 8);
-    crc8= get_crc8(s->gb.buffer, get_bits_count(&s->gb)/8);
+    crc8= av_crc(av_crc07, 0, s->gb.buffer, get_bits_count(&s->gb)/8);
     if(crc8){
         av_log(s->avctx, AV_LOG_ERROR, "header crc mismatch crc=%2X\n", crc8);
         return -1;
@@ -583,6 +550,17 @@ static int decode_frame(FLACContext *s)
     return 0;
 }
 
+static inline int16_t shift_to_16_bits(int32_t data, int bps)
+{
+    if (bps == 24) {
+        return (data >> 8);
+    } else if (bps == 20) {
+        return (data >> 4);
+    } else {
+        return data;
+    }
+}
+
 static int flac_decode_frame(AVCodecContext *avctx,
                             void *data, int *data_size,
                             uint8_t *buf, int buf_size)
@@ -725,23 +703,25 @@ static int flac_decode_frame(AVCodecContext *avctx,
             for (j = 0; j < s->blocksize; j++)
             {
                 for (i = 0; i < s->channels; i++)
-                    *(samples++) = s->decoded[i][j];
+                    *(samples++) = shift_to_16_bits(s->decoded[i][j], s->bps);
             }
             break;
         case LEFT_SIDE:
             assert(s->channels == 2);
             for (i = 0; i < s->blocksize; i++)
             {
-                *(samples++) = s->decoded[0][i];
-                *(samples++) = s->decoded[0][i] - s->decoded[1][i];
+                *(samples++) = shift_to_16_bits(s->decoded[0][i], s->bps);
+                *(samples++) = shift_to_16_bits(s->decoded[0][i]
+                                              - s->decoded[1][i], s->bps);
             }
             break;
         case RIGHT_SIDE:
             assert(s->channels == 2);
             for (i = 0; i < s->blocksize; i++)
             {
-                *(samples++) = s->decoded[0][i] + s->decoded[1][i];
-                *(samples++) = s->decoded[1][i];
+                *(samples++) = shift_to_16_bits(s->decoded[0][i]
+                                              + s->decoded[1][i], s->bps);
+                *(samples++) = shift_to_16_bits(s->decoded[1][i], s->bps);
             }
             break;
         case MID_SIDE:
@@ -754,8 +734,8 @@ static int flac_decode_frame(AVCodecContext *avctx,
 
 #if 1 //needs to be checked but IMHO it should be binary identical
                 mid -= side>>1;
-                *(samples++) = mid + side;
-                *(samples++) = mid;
+                *(samples++) = shift_to_16_bits(mid + side, s->bps);
+                *(samples++) = shift_to_16_bits(mid, s->bps);
 #else
 
                 mid <<= 1;