Untangle mpeg12.c and mdec.c so that mdec.c can be compiled separately.

Originally committed as revision 14851 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/Makefile

@@ -120,7 +120,7 @@ OBJS-$(CONFIG_MP3ADU_DECODER)          += mpegaudiodec.o mpegaudiodecheader.o mp
 OBJS-$(CONFIG_MP3ON4_DECODER)          += mpegaudiodec.o mpegaudiodecheader.o mpegaudio.o mpegaudiodata.o mpeg4audio.o
 OBJS-$(CONFIG_MPC7_DECODER)            += mpc7.o mpc.o mpegaudiodec.o mpegaudiodecheader.o mpegaudio.o mpegaudiodata.o
 OBJS-$(CONFIG_MPC8_DECODER)            += mpc8.o mpc.o mpegaudiodec.o mpegaudiodecheader.o mpegaudio.o mpegaudiodata.o
-OBJS-$(CONFIG_MDEC_DECODER)            += mpeg12.o mpeg12data.o mpegvideo.o error_resilience.o
+OBJS-$(CONFIG_MDEC_DECODER)            += mdec.o mpeg12.o mpeg12data.o mpegvideo.o error_resilience.o
 OBJS-$(CONFIG_MPEGVIDEO_DECODER)       += mpeg12.o mpeg12data.o mpegvideo.o error_resilience.o
 OBJS-$(CONFIG_MPEG1VIDEO_DECODER)      += mpeg12.o mpeg12data.o mpegvideo.o error_resilience.o
 OBJS-$(CONFIG_MPEG1VIDEO_ENCODER)      += mpeg12enc.o mpeg12data.o mpegvideo_enc.o motion_est.o ratecontrol.o mpeg12.o mpeg12data.o mpegvideo.o error_resilience.o

libavcodec/mdec.c

@@ -30,6 +30,7 @@
 #include "avcodec.h"
 #include "dsputil.h"
 #include "mpegvideo.h"
+#include "mpeg12.h"
 
 typedef struct MDECContext{
     AVCodecContext *avctx;
@@ -223,7 +224,7 @@ static av_cold int decode_init(AVCodecContext *avctx){
     AVFrame *p= &a->picture;
 
     mdec_common_init(avctx);
-    init_vlcs();
+    ff_init_vlcs();
     ff_init_scantable(a->dsp.idct_permutation, &a->scantable, ff_zigzag_direct);
 
     p->qstride= a->mb_width;

libavcodec/mpeg12.c

@@ -39,13 +39,11 @@
 //#include <assert.h>
 
 
-#define DC_VLC_BITS 9
 #define MV_VLC_BITS 9
 #define MBINCR_VLC_BITS 9
 #define MB_PAT_VLC_BITS 9
 #define MB_PTYPE_VLC_BITS 6
 #define MB_BTYPE_VLC_BITS 6
-#define TEX_VLC_BITS 9
 
 static inline int mpeg1_decode_block_inter(MpegEncContext *s,
                               DCTELEM *block,
@@ -144,15 +142,13 @@ void ff_mpeg1_clean_buffers(MpegEncContext *s){
 /******************************************/
 /* decoding */
 
-static VLC dc_lum_vlc;
-static VLC dc_chroma_vlc;
 static VLC mv_vlc;
 static VLC mbincr_vlc;
 static VLC mb_ptype_vlc;
 static VLC mb_btype_vlc;
 static VLC mb_pat_vlc;
 
-static av_cold void init_vlcs(void)
+av_cold void ff_init_vlcs(void)
 {
     static int done = 0;
 
@@ -620,27 +616,6 @@ static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
     return val;
 }
 
-static inline int decode_dc(GetBitContext *gb, int component)
-{
-    int code, diff;
-
-    if (component == 0) {
-        code = get_vlc2(gb, dc_lum_vlc.table, DC_VLC_BITS, 2);
-    } else {
-        code = get_vlc2(gb, dc_chroma_vlc.table, DC_VLC_BITS, 2);
-    }
-    if (code < 0){
-        av_log(NULL, AV_LOG_ERROR, "invalid dc code at\n");
-        return 0xffff;
-    }
-    if (code == 0) {
-        diff = 0;
-    } else {
-        diff = get_xbits(gb, code);
-    }
-    return diff;
-}
-
 static inline int mpeg1_decode_block_intra(MpegEncContext *s,
                                DCTELEM *block,
                                int n)
@@ -1220,7 +1195,7 @@ static av_cold int mpeg_decode_init(AVCodecContext *avctx)
     s->mpeg_enc_ctx.flags= avctx->flags;
     s->mpeg_enc_ctx.flags2= avctx->flags2;
     ff_mpeg12_common_init(&s->mpeg_enc_ctx);
-    init_vlcs();
+    ff_init_vlcs();
 
     s->mpeg_enc_ctx_allocated = 0;
     s->mpeg_enc_ctx.picture_number = 0;
@@ -2512,8 +2487,3 @@ AVCodec mpeg_xvmc_decoder = {
 };
 
 #endif
-
-/* this is ugly i know, but the alternative is too make
-   hundreds of vars global and prefix them with ff_mpeg1_
-   which is far uglier. */
-#include "mdec.c"

libavcodec/mpeg12.h

@@ -24,8 +24,36 @@
 
 #include "mpegvideo.h"
 
+#define DC_VLC_BITS 9
+#define TEX_VLC_BITS 9
+
+static VLC dc_lum_vlc;
+static VLC dc_chroma_vlc;
+
 extern uint8_t ff_mpeg12_static_rl_table_store[2][2][2*MAX_RUN + MAX_LEVEL + 3];
 
 void ff_mpeg12_common_init(MpegEncContext *s);
+void ff_init_vlcs(void);
+
+static inline int decode_dc(GetBitContext *gb, int component)
+{
+    int code, diff;
+
+    if (component == 0) {
+        code = get_vlc2(gb, dc_lum_vlc.table, DC_VLC_BITS, 2);
+    } else {
+        code = get_vlc2(gb, dc_chroma_vlc.table, DC_VLC_BITS, 2);
+    }
+    if (code < 0){
+        av_log(NULL, AV_LOG_ERROR, "invalid dc code at\n");
+        return 0xffff;
+    }
+    if (code == 0) {
+        diff = 0;
+    } else {
+        diff = get_xbits(gb, code);
+    }
+    return diff;
+}
 
 #endif /* FFMPEG_MPEG12_H */