path: root/amadec/pcmenc_api.c (plain)
blob: 09c36262211a399d4ed16363205e1c09491b3a21

1	/*************************************************************************************
2	* @file pcmenc_api.c
3	* @brief
4	*
5	* Detailed description starts here.
6	*
7	* @author jian.xu, jian.xu@amlogic.com
8	*
9	* @internal
10	* Created 20124-26
11	* Revision v1.0
12	* Compiler gcc/g++
13	* Company Amlogic Inc.
14	* Copyright Copyright (c) 2011, herbert.hu
15	*
16	* This source code is released for free distribution under the terms of the
17	* GNU General Public License as published by the Free Software Foundation.
18	*************************************************************************************
19	*/
20	#include <stdio.h>
21	#include <unistd.h>
22	#include <stdlib.h>
23	#include <sys/types.h>
24	#include <sys/stat.h>
25	#include <sys/ioctl.h>
26	#include <signal.h>
27	#include <errno.h>
28	#include <fcntl.h>
29	#include <string.h>
30	#include <sys/mman.h>
31	#include "pcmenc_api.h"
32	#define AUDIODSP_PCMENC_DEV_NAME "/dev/audiodsp_pcmenc"
33
34	static char *map_buf = (void *)-1L;
35	static unsigned read_offset = 0;
36	static unsigned buffer_size = 0;
37	static int dev_fd = -1;
38	#include <log-print.h>
39	int pcmenc_init()
40	{
41	buffer_size = 0;
42	read_offset = 0;
43	dev_fd = -1;
44	dev_fd = open(AUDIODSP_PCMENC_DEV_NAME, O_RDONLY);
45	if (dev_fd < 0) {
46	//printf("can not open %s\n", AUDIODSP_PCMENC_DEV_NAME);
47	adec_print("can not open %s\n", AUDIODSP_PCMENC_DEV_NAME);
48	return -1;
49	}
50	ioctl(dev_fd, AUDIODSP_PCMENC_GET_RING_BUF_SIZE, &buffer_size);
51	/* mapping the kernel buffer to user space to acess */
52	map_buf = mmap(0, buffer_size, PROT_READ , MAP_PRIVATE, dev_fd, 0);
53	if (map_buf == (void*)-1L) {
54	//printf("pcmenc:mmap failed,err id %d \n",errno);
55	adec_print("pcmenc:mmap failed,err id %d \n", errno);
56	close(dev_fd);
57	return -1;
58	}
59	return 0;
60	}
61	static unsigned pcm_read_num = 0;
62	static int pcmenc_skip_pcm(int size)
63	{
64	int ring_buf_content = 0;
65	int len = 0;
66	int tail = 0;
67	ioctl(dev_fd, AUDIODSP_PCMENC_GET_RING_BUF_CONTENT, &ring_buf_content);
68	if (ring_buf_content > size) {
69	if (read_offset + size > buffer_size) {
70	//tail = size - read_offset;
71	tail = buffer_size - read_offset;
72	// memcpy(inputbuf,map_buf+read_offset,tail);
73	read_offset = 0;
74	// memcpy(inputbuf+tail,map_buf+read_offset,size-tail);
75	read_offset = size - tail;
76	} else {
77	// memcpy(inputbuf,map_buf+read_offset,size);
78	read_offset += size;
79
80	}
81	pcm_read_num += size;
82	ioctl(dev_fd, AUDIODSP_PCMENC_SET_RING_BUF_RPTR, read_offset);
83	return size;
84	} else {
85	return 0;
86	}
87
88	}
89	int pcmenc_read_pcm(char *inputbuf, uint size)
90	{
91	unsigned int ring_buf_content = 0;
92	int len = 0;
93	int tail = 0;
94	ioctl(dev_fd, AUDIODSP_PCMENC_GET_RING_BUF_CONTENT, &ring_buf_content);
95	if (ring_buf_content > buffer_size * 4 / 5) {
96	pcmenc_skip_pcm(size * 4);
97	memset(inputbuf, 0, size);
98	adec_print("pcmenc buffer full,skip %d bytes \n", 4 * size);
99	return size;
100
101	//ioctl(dev_fd, AUDIODSP_PCMENC_GET_RING_BUF_CONTENT, &ring_buf_content);
102	}
103	//adec_print("read num %d,countent %d,total %d\n",pcm_read_num,ring_buf_content,pcm_read_num+ring_buf_content);
104	if (ring_buf_content > size) {
105	if (read_offset + size > buffer_size) {
106	//tail = size - read_offset;
107	tail = buffer_size - read_offset;
108	memcpy(inputbuf, map_buf + read_offset, tail);
109	read_offset = 0;
110	memcpy(inputbuf + tail, map_buf + read_offset, size - tail);
111	read_offset = size - tail;
112	} else {
113	memcpy(inputbuf, map_buf + read_offset, size);
114	read_offset += size;
115
116	}
117	pcm_read_num += size;
118	ioctl(dev_fd, AUDIODSP_PCMENC_SET_RING_BUF_RPTR, read_offset);
119	return size;
120	} else {
121	return 0;
122	}
123	}
124	int pcmenc_get_pcm_info(pcm51_encoded_info_t *info)
125	{
126	int ret;
127	ret = ioctl(dev_fd, AUDIODSP_PCMENC_GET_PCMINFO, info);
128	if (ret) {
129	return ret;
130	}
131	adec_print("InfoValidFlag %d,SampFs %d,NumCh %d,AcMode %d,LFEFlag %d,BitsPerSamp %d \n", \
132	info->InfoValidFlag, info->SampFs, info->NumCh, info->AcMode, info->LFEFlag, info->BitsPerSamp);
133	return 0;
134
135	}
136	int pcmenc_deinit()
137	{
138	pcm_read_num = 0;
139
140	if (map_buf != (void *)-1L) {
141	munmap(map_buf, buffer_size);
142	}
143	if (dev_fd >= 0) {
144	close(dev_fd);
145	}
146	return 0;
147	}