avcodec/dca: simplify 'residual ok' flag tracking

[ffmpeg] / libavcodec / dcadec.h

diff --git a/libavcodec/dcadec.h b/libavcodec/dcadec.h
index 6726121d3ad10d7c4bf0daeac36718796dd4672a..85283326e77dc6cf5480045b346e34151643b237 100644 (file)
--- a/libavcodec/dcadec.h
+++ b/libavcodec/dcadec.h
@@ -22,6 +22,7 @@
 #define AVCODEC_DCADEC_H
 
 #include "libavutil/common.h"
+#include "libavutil/crc.h"
 #include "libavutil/float_dsp.h"
 
 #include "avcodec.h"
@@ -31,13 +32,18 @@
 #include "dca_core.h"
 #include "dca_exss.h"
 #include "dca_xll.h"
+#include "dca_lbr.h"
 
 #define DCA_BUFFER_PADDING_SIZE     1024
 
 #define DCA_PACKET_CORE         0x01
 #define DCA_PACKET_EXSS         0x02
 #define DCA_PACKET_XLL          0x04
-#define DCA_PACKET_RECOVERY     0x08
+#define DCA_PACKET_LBR          0x08
+#define DCA_PACKET_MASK         0x0f
+
+#define DCA_PACKET_RECOVERY     0x10    ///< Sync error recovery flag
+#define DCA_PACKET_RESIDUAL     0x20    ///< Core valid for residual decoding
 
 typedef struct DCAContext {
     const AVClass   *class;       ///< class for AVOptions
@@ -46,29 +52,42 @@ typedef struct DCAContext {
     DCACoreDecoder core;  ///< Core decoder context
     DCAExssParser  exss;  ///< EXSS parser context
     DCAXllDecoder  xll;   ///< XLL decoder context
+    DCALbrDecoder  lbr;   ///< LBR decoder context
 
     DCADSPContext   dcadsp;
 
+    const AVCRC     *crctab;
+
     uint8_t         *buffer;    ///< Packet buffer
     unsigned int    buffer_size;
 
     int     packet; ///< Packet flags
 
-    int     core_residual_valid;    ///< Core valid for residual decoding
-
     int     request_channel_layout; ///< Converted from avctx.request_channel_layout
     int     core_only;              ///< Core only decoding flag
 } DCAContext;
 
 int ff_dca_set_channel_layout(AVCodecContext *avctx, int *ch_remap, int dca_mask);
 
-int ff_dca_check_crc(GetBitContext *s, int p1, int p2);
-
 void ff_dca_downmix_to_stereo_fixed(DCADSPContext *dcadsp, int32_t **samples,
                                     int *coeff_l, int nsamples, int ch_mask);
 void ff_dca_downmix_to_stereo_float(AVFloatDSPContext *fdsp, float **samples,
                                     int *coeff_l, int nsamples, int ch_mask);
 
+static inline int ff_dca_check_crc(AVCodecContext *avctx, GetBitContext *s,
+                                   int p1, int p2)
+{
+    DCAContext *dca = avctx->priv_data;
+
+    if (!(avctx->err_recognition & (AV_EF_CRCCHECK | AV_EF_CAREFUL)))
+        return 0;
+    if (((p1 | p2) & 7) || p1 < 0 || p2 > s->size_in_bits || p2 - p1 < 16)
+        return -1;
+    if (av_crc(dca->crctab, 0xffff, s->buffer + p1 / 8, (p2 - p1) / 8))
+        return -1;
+    return 0;
+}
+
 static inline int ff_dca_seek_bits(GetBitContext *s, int p)
 {
     if (p < s->index || p > s->size_in_bits)