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remove duplicated find_frame_end() code

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move codec specific code from parser.c -> <codecname>.c as far as its easily possible

Originally committed as revision 3087 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer
2004-04-29 14:21:33 +00:00
parent 20da31792b
commit e4cb187db8
6 changed files with 108 additions and 314 deletions
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254
libavcodec/parser.c
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@@ -144,15 +144,8 @@ void av_parser_close(AVCodecParserContext *s)
#define SLICE_MAX_START_CODE 0x000001af
typedef struct ParseContext1{
uint8_t *buffer;
int index;
int last_index;
int buffer_size;
uint32_t state; ///< contains the last few bytes in MSB order
int frame_start_found;
int overread; ///< the number of bytes which where irreversibly read from the next frame
int overread_index; ///< the index into ParseContext1.buffer of the overreaded bytes
ParseContext pc;
/* XXX/FIXME PC1 vs. PC */
/* MPEG2 specific */
int frame_rate;
int progressive_sequence;
@@ -167,7 +160,7 @@ typedef struct ParseContext1{
* combines the (truncated) bitstream to a complete frame
* @returns -1 if no complete frame could be created
*/
static int ff_combine_frame1(ParseContext1 *pc, int next, uint8_t **buf, int *buf_size)
int ff_combine_frame(ParseContext *pc, int next, uint8_t **buf, int *buf_size)
{
#if 0
if(pc->overread){
@@ -220,48 +213,6 @@ static int ff_combine_frame1(ParseContext1 *pc, int next, uint8_t **buf, int *bu
return 0;
}
/**
* finds the end of the current frame in the bitstream.
* @return the position of the first byte of the next frame, or -1
*/
static int mpeg1_find_frame_end(ParseContext1 *pc, const uint8_t *buf, int buf_size)
{
int i;
uint32_t state;
state= pc->state;
i=0;
if(!pc->frame_start_found){
for(i=0; i<buf_size; i++){
state= (state<<8) | buf[i];
if(state >= SLICE_MIN_START_CODE && state <= SLICE_MAX_START_CODE){
i++;
pc->frame_start_found=1;
break;
}
}
}
if(pc->frame_start_found){
/* EOF considered as end of frame */
if (buf_size == 0)
return 0;
for(; i<buf_size; i++){
state= (state<<8) | buf[i];
if((state&0xFFFFFF00) == 0x100){
if(state < SLICE_MIN_START_CODE || state > SLICE_MAX_START_CODE){
pc->frame_start_found=0;
pc->state=-1;
return i-3;
}
}
}
}
pc->state= state;
return END_NOT_FOUND;
}
static int find_start_code(const uint8_t **pbuf_ptr, const uint8_t *buf_end)
{
const uint8_t *buf_ptr;
@@ -404,12 +355,13 @@ static int mpegvideo_parse(AVCodecParserContext *s,
uint8_t **poutbuf, int *poutbuf_size,
const uint8_t *buf, int buf_size)
{
ParseContext1 *pc = s->priv_data;
ParseContext1 *pc1 = s->priv_data;
ParseContext *pc= &pc1->pc;
int next;
next= mpeg1_find_frame_end(pc, buf, buf_size);
next= ff_mpeg1_find_frame_end(pc, buf, buf_size);
if (ff_combine_frame1(pc, next, (uint8_t **)&buf, &buf_size) < 0) {
if (ff_combine_frame(pc, next, (uint8_t **)&buf, &buf_size) < 0) {
*poutbuf = NULL;
*poutbuf_size = 0;
return buf_size;
@@ -428,59 +380,23 @@ static int mpegvideo_parse(AVCodecParserContext *s,
return next;
}
static void mpegvideo_parse_close(AVCodecParserContext *s)
void ff_parse_close(AVCodecParserContext *s)
{
ParseContext1 *pc = s->priv_data;
ParseContext *pc = s->priv_data;
av_free(pc->buffer);
av_free(pc->enc);
}
static void parse1_close(AVCodecParserContext *s)
{
ParseContext1 *pc1 = s->priv_data;
av_free(pc1->pc.buffer);
av_free(pc1->enc);
}
/*************************/
/**
* finds the end of the current frame in the bitstream.
* @return the position of the first byte of the next frame, or -1
*/
static int mpeg4_find_frame_end(ParseContext1 *pc,
const uint8_t *buf, int buf_size)
{
int vop_found, i;
uint32_t state;
vop_found= pc->frame_start_found;
state= pc->state;
i=0;
if(!vop_found){
for(i=0; i<buf_size; i++){
state= (state<<8) | buf[i];
if(state == 0x1B6){
i++;
vop_found=1;
break;
}
}
}
if(vop_found){
/* EOF considered as end of frame */
if (buf_size == 0)
return 0;
for(; i<buf_size; i++){
state= (state<<8) | buf[i];
if((state&0xFFFFFF00) == 0x100){
pc->frame_start_found=0;
pc->state=-1;
return i-3;
}
}
}
pc->frame_start_found= vop_found;
pc->state= state;
return END_NOT_FOUND;
}
/* used by parser */
/* XXX: make it use less memory */
static int av_mpeg4_decode_header(AVCodecParserContext *s1,
@@ -526,12 +442,12 @@ static int mpeg4video_parse(AVCodecParserContext *s,
uint8_t **poutbuf, int *poutbuf_size,
const uint8_t *buf, int buf_size)
{
ParseContext1 *pc = s->priv_data;
ParseContext *pc = s->priv_data;
int next;
next= mpeg4_find_frame_end(pc, buf, buf_size);
next= ff_mpeg4_find_frame_end(pc, buf, buf_size);
if (ff_combine_frame1(pc, next, (uint8_t **)&buf, &buf_size) < 0) {
if (ff_combine_frame(pc, next, (uint8_t **)&buf, &buf_size) < 0) {
*poutbuf = NULL;
*poutbuf_size = 0;
return buf_size;
@@ -545,116 +461,6 @@ static int mpeg4video_parse(AVCodecParserContext *s,
/*************************/
static int h263_find_frame_end(ParseContext1 *pc, const uint8_t *buf, int buf_size)
{
int vop_found, i;
uint32_t state;
vop_found= pc->frame_start_found;
state= pc->state;
i=0;
if(!vop_found){
for(i=0; i<buf_size; i++){
state= (state<<8) | buf[i];
if(state>>(32-22) == 0x20){
i++;
vop_found=1;
break;
}
}
}
if(vop_found){
for(; i<buf_size; i++){
state= (state<<8) | buf[i];
if(state>>(32-22) == 0x20){
pc->frame_start_found=0;
pc->state=-1;
return i-3;
}
}
}
pc->frame_start_found= vop_found;
pc->state= state;
return END_NOT_FOUND;
}
static int h263_parse(AVCodecParserContext *s,
AVCodecContext *avctx,
uint8_t **poutbuf, int *poutbuf_size,
const uint8_t *buf, int buf_size)
{
ParseContext1 *pc = s->priv_data;
int next;
next= h263_find_frame_end(pc, buf, buf_size);
if (ff_combine_frame1(pc, next, (uint8_t **)&buf, &buf_size) < 0) {
*poutbuf = NULL;
*poutbuf_size = 0;
return buf_size;
}
*poutbuf = (uint8_t *)buf;
*poutbuf_size = buf_size;
return next;
}
/*************************/
/**
* finds the end of the current frame in the bitstream.
* @return the position of the first byte of the next frame, or -1
*/
static int h264_find_frame_end(ParseContext1 *pc, const uint8_t *buf, int buf_size)
{
int i;
uint32_t state;
//printf("first %02X%02X%02X%02X\n", buf[0], buf[1],buf[2],buf[3]);
// mb_addr= pc->mb_addr - 1;
state= pc->state;
//FIXME this will fail with slices
for(i=0; i<buf_size; i++){
state= (state<<8) | buf[i];
if((state&0xFFFFFF1F) == 0x101 || (state&0xFFFFFF1F) == 0x102 || (state&0xFFFFFF1F) == 0x105){
if(pc->frame_start_found){
pc->state=-1;
pc->frame_start_found= 0;
return i-3;
}
pc->frame_start_found= 1;
}
}
pc->state= state;
return END_NOT_FOUND;
}
static int h264_parse(AVCodecParserContext *s,
AVCodecContext *avctx,
uint8_t **poutbuf, int *poutbuf_size,
const uint8_t *buf, int buf_size)
{
ParseContext1 *pc = s->priv_data;
int next;
next= h264_find_frame_end(pc, buf, buf_size);
if (ff_combine_frame1(pc, next, (uint8_t **)&buf, &buf_size) < 0) {
*poutbuf = NULL;
*poutbuf_size = 0;
return buf_size;
}
*poutbuf = (uint8_t *)buf;
*poutbuf_size = buf_size;
return next;
}
/*************************/
typedef struct MpegAudioParseContext {
uint8_t inbuf[MPA_MAX_CODED_FRAME_SIZE]; /* input buffer */
uint8_t *inbuf_ptr;
@@ -913,7 +719,7 @@ AVCodecParser mpegvideo_parser = {
sizeof(ParseContext1),
NULL,
mpegvideo_parse,
mpegvideo_parse_close,
parse1_close,
};
AVCodecParser mpeg4video_parser = {
@@ -921,23 +727,7 @@ AVCodecParser mpeg4video_parser = {
sizeof(ParseContext1),
mpeg4video_parse_init,
mpeg4video_parse,
mpegvideo_parse_close,
};
AVCodecParser h263_parser = {
{ CODEC_ID_H263 },
sizeof(ParseContext1),
NULL,
h263_parse,
mpegvideo_parse_close,
};
AVCodecParser h264_parser = {
{ CODEC_ID_H264 },
sizeof(ParseContext1),
NULL,
h264_parse,
mpegvideo_parse_close,
parse1_close,
};
AVCodecParser mpegaudio_parser = {