Make the following H264 functions available to the parser:

ff_h264_decode_sei, ff_h264_decode_seq_parameter_set,
ff_h264_decode_picture_parameter_set, ff_h264_decode_nal,
ff_h264_decode_rbsp_trailing

Patch by Ivan Schreter, schreter gmx net

Originally committed as revision 17487 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/h264.c

@@ -1359,14 +1359,7 @@ static inline void write_back_motion(H264Context *h, int mb_type){
     }
 }
 
-/**
+const uint8_t *ff_h264_decode_nal(H264Context *h, const uint8_t *src, int *dst_length, int *consumed, int length){
- * Decodes a network abstraction layer unit.
- * @param consumed is the number of bytes used as input
- * @param length is the length of the array
- * @param dst_length is the number of decoded bytes FIXME here or a decode rbsp tailing?
- * @returns decoded bytes, might be src+1 if no escapes
- */
-static const uint8_t *decode_nal(H264Context *h, const uint8_t *src, int *dst_length, int *consumed, int length){
     int i, si, di;
     uint8_t *dst;
     int bufidx;
@@ -1456,11 +1449,7 @@ nsc:
     return dst;
 }
 
-/**
+int ff_h264_decode_rbsp_trailing(H264Context *h, const uint8_t *src){
- * identifies the exact end of the bitstream
- * @return the length of the trailing, or 0 if damaged
- */
-static int decode_rbsp_trailing(H264Context *h, const uint8_t *src){
     int v= *src;
     int r;
 
@@ -6897,7 +6886,7 @@ static int decode_buffering_period(H264Context *h){
     return 0;
 }
 
-static int decode_sei(H264Context *h){
+int ff_h264_decode_sei(H264Context *h){
     MpegEncContext * const s = &h->s;
 
     while(get_bits_count(&s->gb) + 16 < s->gb.size_in_bits){
@@ -7091,7 +7080,7 @@ static void decode_scaling_matrices(H264Context *h, SPS *sps, PPS *pps, int is_s
     }
 }
 
-static inline int decode_seq_parameter_set(H264Context *h){
+int ff_h264_decode_seq_parameter_set(H264Context *h){
     MpegEncContext * const s = &h->s;
     int profile_idc, level_idc;
     unsigned int sps_id;
@@ -7238,7 +7227,7 @@ build_qp_table(PPS *pps, int t, int index)
         pps->chroma_qp_table[t][i] = chroma_qp[av_clip(i + index, 0, 51)];
 }
 
-static inline int decode_picture_parameter_set(H264Context *h, int bit_length){
+int ff_h264_decode_picture_parameter_set(H264Context *h, int bit_length){
     MpegEncContext * const s = &h->s;
     unsigned int pps_id= get_ue_golomb(&s->gb);
     PPS *pps;
@@ -7449,13 +7438,13 @@ static int decode_nal_units(H264Context *h, const uint8_t *buf, int buf_size){
 
         hx = h->thread_context[context_count];
 
-        ptr= decode_nal(hx, buf + buf_index, &dst_length, &consumed, h->is_avc ? nalsize : buf_size - buf_index);
+        ptr= ff_h264_decode_nal(hx, buf + buf_index, &dst_length, &consumed, h->is_avc ? nalsize : buf_size - buf_index);
         if (ptr==NULL || dst_length < 0){
             return -1;
         }
         while(ptr[dst_length - 1] == 0 && dst_length > 0)
             dst_length--;
-        bit_length= !dst_length ? 0 : (8*dst_length - decode_rbsp_trailing(h, ptr + dst_length - 1));
+        bit_length= !dst_length ? 0 : (8*dst_length - ff_h264_decode_rbsp_trailing(h, ptr + dst_length - 1));
 
         if(s->avctx->debug&FF_DEBUG_STARTCODE){
             av_log(h->s.avctx, AV_LOG_DEBUG, "NAL %d at %d/%d length %d\n", hx->nal_unit_type, buf_index, buf_size, dst_length);
@@ -7537,11 +7526,11 @@ static int decode_nal_units(H264Context *h, const uint8_t *buf, int buf_size){
             break;
         case NAL_SEI:
             init_get_bits(&s->gb, ptr, bit_length);
-            decode_sei(h);
+            ff_h264_decode_sei(h);
             break;
         case NAL_SPS:
             init_get_bits(&s->gb, ptr, bit_length);
-            decode_seq_parameter_set(h);
+            ff_h264_decode_seq_parameter_set(h);
 
             if(s->flags& CODEC_FLAG_LOW_DELAY)
                 s->low_delay=1;
@@ -7552,7 +7541,7 @@ static int decode_nal_units(H264Context *h, const uint8_t *buf, int buf_size){
         case NAL_PPS:
             init_get_bits(&s->gb, ptr, bit_length);
 
-            decode_picture_parameter_set(h, bit_length);
+            ff_h264_decode_picture_parameter_set(h, bit_length);
 
             break;
         case NAL_AUD:
@@ -8039,7 +8028,7 @@ int main(void){
             return -1;
         }
 
-        out= decode_nal(&h, nal, &out_length, &consumed, nal_length);
+        out= ff_h264_decode_nal(&h, nal, &out_length, &consumed, nal_length);
 
         STOP_TIMER("NAL")
 

libavcodec/h264.h

@@ -532,4 +532,34 @@ typedef struct H264Context{
     int initial_cpb_removal_delay[32]; ///< Initial timestamps for CPBs
 }H264Context;
 
+/**
+ * Decode SEI
+ */
+int ff_h264_decode_sei(H264Context *h);
+
+/**
+ * Decode SPS
+ */
+int ff_h264_decode_seq_parameter_set(H264Context *h);
+
+/**
+ * Decode PPS
+ */
+int ff_h264_decode_picture_parameter_set(H264Context *h, int bit_length);
+
+/**
+ * Decodes a network abstraction layer unit.
+ * @param consumed is the number of bytes used as input
+ * @param length is the length of the array
+ * @param dst_length is the number of decoded bytes FIXME here or a decode rbsp tailing?
+ * @returns decoded bytes, might be src+1 if no escapes
+ */
+const uint8_t *ff_h264_decode_nal(H264Context *h, const uint8_t *src, int *dst_length, int *consumed, int length);
+
+/**
+ * identifies the exact end of the bitstream
+ * @return the length of the trailing, or 0 if damaged
+ */
+int ff_h264_decode_rbsp_trailing(H264Context *h, const uint8_t *src);
+
 #endif /* AVCODEC_H264_H */