change of aac_ac3_parser, so it is able to send complete portion of data to decoder

Originally committed as revision 12758 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/aac_ac3_parser.c

@@ -29,35 +29,32 @@ int ff_aac_ac3_parse(AVCodecParserContext *s1,
                      const uint8_t *buf, int buf_size)
 {
     AACAC3ParseContext *s = s1->priv_data;
-    AACAC3FrameFlag frame_flag;
-    const uint8_t *buf_ptr;
-    int len;
+    ParseContext *pc = &s->pc;
+    int len, i;
 
-    *poutbuf = NULL;
-    *poutbuf_size = 0;
-
-    buf_ptr = buf;
-    while (buf_size > 0) {
-        int size_needed= s->frame_size ? s->frame_size : s->header_size;
-        len = s->inbuf_ptr - s->inbuf;
+    while(s->remaining_size <= buf_size){
+        if(s->remaining_size && !s->need_next_header){
+            i= s->remaining_size;
+            s->remaining_size = 0;
+            goto output_frame;
+        }else{ //we need a header first
+            len=0;
+            for(i=s->remaining_size; i<buf_size; i++){
+                s->state = (s->state<<8) + buf[i];
+                if((len=s->sync(s->state, s, &s->need_next_header, &s->new_frame_start)))
+                    break;
+            }
+            i-= s->header_size;
+            if(len>0){
+                s->remaining_size = len + i;
 
-        if(len<size_needed){
-            len = FFMIN(size_needed - len, buf_size);
-            memcpy(s->inbuf_ptr, buf_ptr, len);
-            buf_ptr      += len;
-            s->inbuf_ptr += len;
-            buf_size     -= len;
-        }
+                if(pc->index+i > 0 && s->new_frame_start){
+                    s->remaining_size -= i; // remaining_size=len
+output_frame:
+                    ff_combine_frame(pc, i, &buf, &buf_size);
+                    *poutbuf = buf;
+                    *poutbuf_size = buf_size;
 
-        if (s->frame_size == 0) {
-            if ((s->inbuf_ptr - s->inbuf) == s->header_size) {
-                len = s->sync(s, &frame_flag);
-                if (len == 0) {
-                    /* no sync found : move by one byte (inefficient, but simple!) */
-                    memmove(s->inbuf, s->inbuf + 1, s->header_size - 1);
-                    s->inbuf_ptr--;
-                } else {
-                    s->frame_size = len;
                     /* update codec info */
                     avctx->sample_rate = s->sample_rate;
                     /* allow downmixing to stereo (or mono for AC3) */
@@ -72,17 +69,18 @@ int ff_aac_ac3_parse(AVCodecParserContext *s1,
                     }
                     avctx->bit_rate = s->bit_rate;
                     avctx->frame_size = s->samples;
+
+                    return i;
                 }
-            }
-        } else {
-            if(s->inbuf_ptr - s->inbuf == s->frame_size){
-                *poutbuf = s->inbuf;
-                *poutbuf_size = s->frame_size;
-                s->inbuf_ptr = s->inbuf;
-                s->frame_size = 0;
+            }else{
                 break;
             }
         }
     }
-    return buf_ptr - buf;
+
+    ff_combine_frame(pc, END_NOT_FOUND, &buf, &buf_size);
+    s->remaining_size -= FFMIN(s->remaining_size, buf_size);
+    *poutbuf = NULL;
+    *poutbuf_size = 0;
+    return buf_size;
 }

libavcodec/aac_ac3_parser.h

@@ -26,23 +26,23 @@
 #include <stdint.h>
 #include "avcodec.h"
 
-typedef enum{
-    FRAME_COMPLETE,    ///< Complete frame, ends previous frame
-    FRAME_START,       ///< Frame start, ends previous frame
-    FRAME_CONTINUATION ///< Part of the previous frame
-}AACAC3FrameFlag;
-
 typedef struct AACAC3ParseContext {
-    uint8_t *inbuf_ptr;
     int frame_size;
     int header_size;
-    int (*sync)(struct AACAC3ParseContext *hdr_info, AACAC3FrameFlag *flag);
-    uint8_t inbuf[8192]; /* input buffer */
+    int (*sync)(uint64_t state, struct AACAC3ParseContext *hdr_info,
+            int *need_next_header, int *new_frame_start);
 
     int channels;
     int sample_rate;
     int bit_rate;
     int samples;
+
+    ParseContext pc;
+    int remaining_size;
+    uint64_t state;
+
+    int need_next_header;
+    int new_frame_start;
 } AACAC3ParseContext;
 
 int ff_aac_ac3_parse(AVCodecParserContext *s1,

libavcodec/aac_parser.c

@@ -27,12 +27,14 @@
 
 #define AAC_HEADER_SIZE 7
 
-static int aac_sync(AACAC3ParseContext *hdr_info, AACAC3FrameFlag *flag)
+static int aac_sync(uint64_t state, AACAC3ParseContext *hdr_info,
+        int *need_next_header, int *new_frame_start)
 {
     GetBitContext bits;
     int size, rdb, ch, sr;
+    uint64_t tmp = be2me_64(state);
 
-    init_get_bits(&bits, hdr_info->inbuf, AAC_HEADER_SIZE * 8);
+    init_get_bits(&bits, (uint8_t *)&tmp, AAC_HEADER_SIZE * 8);
 
     if(get_bits(&bits, 12) != 0xfff)
         return 0;
@@ -65,15 +67,15 @@ static int aac_sync(AACAC3ParseContext *hdr_info, AACAC3FrameFlag *flag)
     hdr_info->sample_rate = ff_mpeg4audio_sample_rates[sr];
     hdr_info->samples = (rdb + 1) * 1024;
     hdr_info->bit_rate = size * 8 * hdr_info->sample_rate / hdr_info->samples;
-    *flag = FRAME_COMPLETE;
 
+    *need_next_header=0;
+    *new_frame_start=1;
     return size;
 }
 
 static av_cold int aac_parse_init(AVCodecParserContext *s1)
 {
     AACAC3ParseContext *s = s1->priv_data;
-    s->inbuf_ptr = s->inbuf;
     s->header_size = AAC_HEADER_SIZE;
     s->sync = aac_sync;
     return 0;

libavcodec/ac3_parser.c

@@ -123,12 +123,14 @@ int ff_ac3_parse_header(const uint8_t buf[7], AC3HeaderInfo *hdr)
     return 0;
 }
 
-static int ac3_sync(AACAC3ParseContext *hdr_info, AACAC3FrameFlag *flag)
+static int ac3_sync(uint64_t state, AACAC3ParseContext *hdr_info,
+        int *need_next_header, int *new_frame_start)
 {
     int err;
+    uint64_t tmp = be2me_64(state);
     AC3HeaderInfo hdr;
 
-    err = ff_ac3_parse_header(hdr_info->inbuf, &hdr);
+    err = ff_ac3_parse_header((uint8_t *)&tmp, &hdr);
 
     if(err < 0)
         return 0;
@@ -138,24 +140,14 @@ static int ac3_sync(AACAC3ParseContext *hdr_info, AACAC3FrameFlag *flag)
     hdr_info->channels = hdr.channels;
     hdr_info->samples = AC3_FRAME_SIZE;
 
-    switch(hdr.frame_type){
-        case EAC3_FRAME_TYPE_INDEPENDENT:
-            *flag = FRAME_START;
-            break;
-        case EAC3_FRAME_TYPE_DEPENDENT:
-            *flag = FRAME_CONTINUATION;
-            break;
-        case EAC3_FRAME_TYPE_AC3_CONVERT:
-            *flag = FRAME_COMPLETE;
-            break;
-    }
+    *need_next_header = (hdr.frame_type != EAC3_FRAME_TYPE_AC3_CONVERT);
+    *new_frame_start = (hdr.frame_type != EAC3_FRAME_TYPE_DEPENDENT);
     return hdr.frame_size;
 }
 
 static av_cold int ac3_parse_init(AVCodecParserContext *s1)
 {
     AACAC3ParseContext *s = s1->priv_data;
-    s->inbuf_ptr = s->inbuf;
     s->header_size = AC3_HEADER_SIZE;
     s->sync = ac3_sync;
     return 0;