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use a dynamic ByteIOContext instead of using the lavf buffer 

this makes the code work with big packets, it is also simpler and saves
a byte or 2

Originally committed as revision 10015 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2007-08-09 12:38:24 +00:00
parent 0809b51e52
commit 8d9a3f7e21
2 changed files with 16 additions and 48 deletions
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4
libavformat/nut.h
View File

@ -80,8 +80,8 @@ typedef struct {
typedef struct {
AVFormatContext *avf;
int written_packet_size;
int64_t packet_start;
// int written_packet_size;
// int64_t packet_start;
FrameCode frame_code[256];
uint64_t next_startcode; ///< stores the next startcode if it has already been parsed but the stream is not seekable
StreamContext *stream;

60
libavformat/nutenc.c
View File

@ -177,50 +177,18 @@ static inline void put_s_trace(ByteIOContext *bc, int64_t v, char *file, char *f
#define put_s(bc, v) put_s_trace(bc, v, __FILE__, __PRETTY_FUNCTION__, __LINE__)
#endif
static int put_packetheader(NUTContext *nut, ByteIOContext *bc, int max_size, int calculate_checksum){
put_flush_packet(bc);
nut->packet_start= url_ftell(bc) - 8;
nut->written_packet_size = max_size;
/* packet header */
put_v(bc, nut->written_packet_size); /* forward ptr */
static void put_packet(NUTContext *nut, ByteIOContext *bc, ByteIOContext *dyn_bc, int calculate_checksum){
uint8_t *dyn_buf=NULL;
int dyn_size= url_close_dyn_buf(dyn_bc, &dyn_buf);
put_v(bc, dyn_size + 4*calculate_checksum);
if(calculate_checksum)
init_checksum(bc, av_crc04C11DB7_update, 0);
return 0;
}
/**
*
* must not be called more then once per packet
*/
static int update_packetheader(NUTContext *nut, ByteIOContext *bc, int additional_size, int calculate_checksum){
int64_t start= nut->packet_start;
int64_t cur= url_ftell(bc);
int size= cur - start - get_length(nut->written_packet_size) - 8;
put_buffer(bc, dyn_buf, dyn_size);
if(calculate_checksum)
size += 4;
put_le32(bc, get_checksum(bc));
if(size != nut->written_packet_size){
int i;
assert( size <= nut->written_packet_size );
url_fseek(bc, start + 8, SEEK_SET);
for(i=get_length(size); i < get_length(nut->written_packet_size); i++)
put_byte(bc, 128);
put_v(bc, size);
url_fseek(bc, cur, SEEK_SET);
nut->written_packet_size= size; //FIXME may fail if multiple updates with differing sizes, as get_length may differ
if(calculate_checksum)
put_le32(bc, get_checksum(bc));
}
return 0;
av_free(dyn_buf);
}
static void write_mainheader(NUTContext *nut, ByteIOContext *bc){
@ -325,7 +293,7 @@ static int write_streamheader(NUTContext *nut, ByteIOContext *bc, AVCodecContext
static int write_header(AVFormatContext *s){
NUTContext *nut = s->priv_data;
ByteIOContext *bc = &s->pb;
ByteIOContext *bc = &s->pb, dyn_bc;
AVCodecContext *codec;
int i, j;
@ -367,17 +335,17 @@ static int write_header(AVFormatContext *s){
/* main header */
put_be64(bc, MAIN_STARTCODE);
put_packetheader(nut, bc, 120+5*256/*FIXME check*/, 1);
write_mainheader(nut, bc);
update_packetheader(nut, bc, 0, 1);
url_open_dyn_buf(&dyn_bc);
write_mainheader(nut, &dyn_bc);
put_packet(nut, bc, &dyn_bc, 1);
for (i=0; i < s->nb_streams; i++){
codec = s->streams[i]->codec;
put_be64(bc, STREAM_STARTCODE);
put_packetheader(nut, bc, 120/*FIXME check*/ + codec->extradata_size, 1);
write_streamheader(nut, bc, codec, i);
update_packetheader(nut, bc, 0, 1);
url_open_dyn_buf(&dyn_bc);
write_streamheader(nut, &dyn_bc, codec, i);
put_packet(nut, bc, &dyn_bc, 1);
}
put_flush_packet(bc);