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adx_parser: rewrite. 

The previous code ended in multiple different infinite
loops. See stl_ten_1_big.sfd as example with and without zzuf

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit 7859740c6a)

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2011-12-18 20:12:16 +01:00
parent cb42ed171d
commit d0269db8e3
1 changed files with 23 additions and 38 deletions
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61
libavcodec/adx_parser.c
View File

@ -22,7 +22,7 @@
* @file
* ADX audio parser
*
* Reads header to extradata and splits packets into individual blocks.
* Splits packets into individual blocks.
*/
#include "libavutil/intreadwrite.h"
@ -33,11 +33,9 @@ typedef struct ADXParseContext {
ParseContext pc;
int header_size;
int block_size;
int buf_pos;
int remaining;
} ADXParseContext;
#define MIN_HEADER_SIZE 24
static int adx_parse(AVCodecParserContext *s1,
AVCodecContext *avctx,
const uint8_t **poutbuf, int *poutbuf_size,
@ -46,45 +44,32 @@ static int adx_parse(AVCodecParserContext *s1,
ADXParseContext *s = s1->priv_data;
ParseContext *pc = &s->pc;
int next = END_NOT_FOUND;
int i;
uint64_t state= pc->state64;
if (!avctx->extradata_size) {
int ret;
ff_combine_frame(pc, END_NOT_FOUND, &buf, &buf_size);
if (!s->header_size && pc->index >= MIN_HEADER_SIZE) {
if (ret = avpriv_adx_decode_header(avctx, pc->buffer, pc->index,
&s->header_size, NULL))
return AVERROR_INVALIDDATA;
if(!s->header_size){
for(i=0; i<buf_size; i++){
state= (state<<8) | buf[i];
if((state&0xFFFF0000FFFFFF00) == 0x8000000003120400ULL && (state&0xFF) && ((state>>32)&0xFFFF)>=4){
s->header_size= ((state>>32)&0xFFFF) + 4;
s->block_size = BLOCK_SIZE * (state&0xFF);
s->remaining = i - 7 + s->header_size + s->block_size;
break;
}
}
if (s->header_size && s->header_size <= pc->index) {
avctx->extradata = av_mallocz(s->header_size + FF_INPUT_BUFFER_PADDING_SIZE);
if (!avctx->extradata)
return AVERROR(ENOMEM);
avctx->extradata_size = s->header_size;
memcpy(avctx->extradata, pc->buffer, s->header_size);
memmove(pc->buffer, pc->buffer + s->header_size, s->header_size);
pc->index -= s->header_size;
}
*poutbuf = NULL;
*poutbuf_size = 0;
return buf_size;
pc->state64= state;
}
s->block_size = BLOCK_SIZE * avctx->channels;
if (pc->index - s->buf_pos >= s->block_size) {
*poutbuf = &pc->buffer[s->buf_pos];
*poutbuf_size = s->block_size;
s->buf_pos += s->block_size;
return 0;
if (s->header_size) {
if (!s->remaining) {
s->remaining = s->block_size;
}
if (s->remaining<=buf_size) {
next= s->remaining;
s->remaining = 0;
} else
s->remaining -= buf_size;
}
if (pc->index && s->buf_pos) {
memmove(pc->buffer, &pc->buffer[s->buf_pos], pc->index - s->buf_pos);
pc->index -= s->buf_pos;
s->buf_pos = 0;
}
if (buf_size + pc->index >= s->block_size)
next = s->block_size - pc->index;
if (ff_combine_frame(pc, next, &buf, &buf_size) < 0 || !buf_size) {
*poutbuf = NULL;