mp3emain.c

Intel提供的在Sitsang等嵌入式开发平台上使用Linux操作系统

/******************************************************************************
//               INTEL CORPORATION PROPRIETARY INFORMATION
//  This software is supplied under the terms of a license agreement or
//  nondisclosure agreement with Intel Corporation and may not be copied
//  or disclosed except in accordance with the terms of that agreement.
//        Copyright (C) 2003 Intel Corporation. All Rights Reserved.
//
//  Description:
//    Intel(R) Integrated Performance Primitives Sample Code MP3 Encoder
// 
//  Function List:
//    encoder_parse_cmdline_mp3()
//    main()
******************************************************************************/

#include <stdio.h>
#include <string.h>
#include <stdlib.h>

#include "sampmp3.h"

/******************************************************************************
// Name:             encoder_parse_cmdline_mp3
// Description:      Function for process the command line
// Input Arguments : argc         - number of input arguments.
//                   argv         - pointer to pointer to input arguments list.
//                   fpinput_cmp  - pointer to pointer to input file.
//                   fpoutput_mp3 - pointer to pointer to ouput file.
// Output Arguments: enc_state    - pointer to encoder state structure.
// Returns:          TRUE         - successful.
//                   FALSE        - error accur when process input arguments.
******************************************************************************/
SAMPLE_BOOL  encoder_parse_cmdline_mp3(int argc, char **argv, 
                                       FILE **fpinput_cmp,FILE **fpoutput_mp3,
                                       mp3_enc_state *enc_state)
{
	int bit_rate;
	int sample_rate;
	int valid_flag;
    int i,j;

	if(2 == argc) {
		if(strstr(argv[1], "-h")) {
			printf("\
    ***************************Help information***************************\n\
    Parameter list:                                                       \n\
    -i inputFile -o outputFile -c channelNumber -b bitRate -s sampleRate  \n\
    InputFile     *.PCM file.                                             \n\
    OutputFile	  *.mp3 file.                                             \n\
    ChannelNumber 1 or 2.                                                 \n\
    BitRate       32000, 40000, 48000, 56000, 64000, 80000, 96000,        \n\
                  112000, 128000, 160000, 192000, 224000, 256000, 320000  \n\
    SampleRate    44100, 48000, 32000\n                                   \n\
    **********************************************************************\n\
            ");
		}else {
			printf("Invalid command parameters! use '-h' to see help.\n");
		}
		return FALSE;
	}

	if(2 != argc  && 11 != argc ) {
		printf("Invalid command parameters! use '-h' to see help.\n");
		return FALSE;
	}
    /* Parse first arguument: inputFile and open it */
	if(strcmp(argv[1], "-i")) {
		printf("Input File not specified\n");
		return FALSE;
	} else {
		*fpinput_cmp = NULL;
		*fpinput_cmp = fopen(argv[2], "rb");
		if(!(*fpinput_cmp)) {
			printf("Input file not valid\n");
			return FALSE;
		}
	}
    /* Parse second argument: outputFile and open it */
	if(strcmp(argv[3], "-o")) {
		printf("Output File not specified\n");
		return FALSE;
	} else {
		*fpoutput_mp3 = NULL;
		*fpoutput_mp3 = fopen(argv[4], "wb");
		if(!(*fpoutput_mp3)) {
			printf("Output file not valid\n");
			return FALSE;
		}
	}

	i = 5; 
	while(i < 11) {
        /* It is channel number */
		if(!strcmp(argv[i], "-c")) {
			if(!strcmp(argv[i + 1], "2")) {
				enc_state->channel_num = 2;
			} else if(!strcmp(argv[i + 1], "1")) {
				enc_state->channel_num = 1;
			} else {
				printf("Invalid channel number, program terminated\n");
				return FALSE;
			}
		} else if (!strcmp(argv[i], "-b")) {
		/* It is bit rate */	
            bit_rate = atoi(argv[i + 1]);
			valid_flag = 0;
			for(j = 0; j < 15; j ++) {
				if(bit_rate == mpeg1_bitrate_table[j]) {
					enc_state->bitrate_index = j;
					valid_flag = 1;
					break;
				}
			}
			if(!valid_flag) {
				printf("Invalid bit rate value, program terminate\n");
				return FALSE;
			}

		} else if (!strcmp(argv[i], "-s")) {
		/* It is sample rate */
            sample_rate = atoi(argv[i + 1]);
			valid_flag = 0;
			for(j = 0; j < 3; j ++) {
				if(sample_rate == mpeg1_samplerate_table[j]) {
					enc_state->sample_rate = j;
				}
				valid_flag = 1;
				break;
			}
			if(!valid_flag) {
				printf("Invalid sampling rate value, program terminated\n");
				return FALSE;
			}

		} else {
			printf("Invalid command parameters! use '-h' to see help.\n");
			return FALSE;
		}
		i += 2;
	}

	return TRUE;
}

/******************************************************************************
// Name:        main
//
// Description:      Entry function for MP3 Encoder
//                   Usage: mp3enc -i inputFile -o outputFile -c channelNumber 
//                          -b bitRate -s sampleRate
//
//                   where:
//                          inputFile     is the name of a valid .PCM file
//                          outputFile    is the name of cmpressed .MP3 file 
//                          channelNumber is channel number (1 or 2)
//                          bitRate       is the bit rate of output stream
//                          sampleRate    is samping frenquency of raw data 
// Input Arguments:  argc  - Standard C argument count
//                   argv  - Standard C argument list
//
// Output Arguments: None  
//
// Returns:          0     - No error when decoding    
//                   -1    - Error when decoding
******************************************************************************/
int main(int argc, char **argv)
{
	unsigned int channel_num;
	int end_flag;
	int frame_num;
	int ret_code;
	FILE *fpinput_cmp, *fpoutput_mp3;
	mp3_enc_state *enc_state;
	sample_sound sound;
	sample_bitstream stream_buf;

	enc_state = (mp3_enc_state *)malloc(sizeof(mp3_enc_state));
	if(NULL == enc_state) {
		printf("Error when allocate enc_state buffer!\n");
		return -1;
	}

	/* Process the command line argument */
	ret_code = encoder_parse_cmdline_mp3(argc, argv, &fpinput_cmp, \
                                         &fpoutput_mp3, enc_state);
	if(FALSE == ret_code) {
		return -1;
	}

	/* Initialize the encoder */
	ret_code = encoder_init_alloc_mp3(&sound, &stream_buf, enc_state);
	if(SAMPLE_STATUS_NOERR != ret_code) {
		printf("Initialization failed, program terminated!\n");
		return -1;
	}

	/* Enter the encoding loop */
	end_flag = FALSE;
	channel_num = enc_state->channel_num;
	frame_num = 0;

	while(!end_flag) {
        if(fread(sound.snd_frame, 2, channel_num * 1152, fpinput_cmp) <\
                 channel_num * 1152 ) {
            end_flag = TRUE;
        }
		if(!end_flag) {
            /******************************************************************
            // return value:
            // SAMPLE_STATUS_NOERR      - one frame encode successful
            // SAMPLE_STATUS_ERR        - one frame encode error
            // SAMPLE_STATUS_BADARG_ERR - bad input arguments
            ******************************************************************/
            /* Encode one frame */
			ret_code = encode_mp3(&sound, &stream_buf, enc_state);
			frame_num ++;
			if(ret_code != SAMPLE_STATUS_NOERR) {
				printf("Error when encode frame %d!\n", frame_num);
			}else {
				printf("frame = %d\r", frame_num);

                if((stream_buf.bs_bytelen - (stream_buf.bs_cur_byte - \
                    stream_buf.bs_buffer)) < 1024) {
                    fwrite(stream_buf.bs_buffer, 1, (stream_buf.bs_cur_byte - \
                        stream_buf.bs_buffer), fpoutput_mp3);
	                stream_buf.bs_cur_byte = stream_buf.bs_buffer;
                }
			}
		} else {
	        fwrite(stream_buf.bs_buffer, 1, (stream_buf.bs_cur_byte - \
                stream_buf.bs_buffer), fpoutput_mp3);
	        stream_buf.bs_cur_byte = stream_buf.bs_buffer;
		}
	}
    /* Free encoder state structure */
	free(enc_state);
    /* Free input PCM and output bit stream buffer */
    encoder_free_mp3(&sound, &stream_buf);
	fclose(fpinput_cmp);
	fclose(fpoutput_mp3);

	printf("\nEncoding completed.\n");
	return 0;
}