函数原型
AVIOContext *avio_alloc_context(
unsigned char *buffer,
int buffer_size,
int write_flag,
void *opaque,
int (*read_packet)(void *opaque, uint8_t *buf, int buf_size),
int (*write_packet)(void *opaque, uint8_t *buf, int buf_size),
int64_t (*seek)(void *opaque, int64_t offset, int whence))
{
//创建一个AVIOContext结构体
AVIOContext *s = av_mallocz(sizeof(AVIOContext));
if (!s)
return NULL;
//初始化AVIOContext结构体
ffio_init_context(s, buffer, buffer_size, write_flag, opaque,
read_packet, write_packet, seek);
return s;
}
#define BUF_SIZE 1024*16
AVIOContext* pAVIOContext = avio_alloc_context(pAVIOContext, BUF_SIZE, 0, this, ReadInputData, NULL, NULL);
ReadInputData函数将赋值给read_packet，当调用avcodec_send_packet函数，将会从ReadInputData读取指定的的BUF_SIZE
来进行分帧解析
疑问
设置FFmpeg读缓存区的大小，应该怎么设置比较合理FFmpeg avio_alloc_context函数剖析
原文：http://blog.51cto.com/fengyuzaitu/2055849
