mp4dmain.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:    Decoder main entry function of MPEG-4 video decoder sample
//                  code for Intel(R) Integrated Performance Primitives.
//  Functions List:
//		main()
//		output_frame_mpeg4()
******************************************************************************/

#include "sampmp4.h"

/******************************************************************************
// Name:                output_frame_mpeg4
// Description:         Dump the decoded yuv plane to the appointed output file
//
// Input Parameters:
//      picture         Pointer to the decoded yuv plane
//      fpout           Output file handle
// Output Parameters:
//      fpout           The updated output file handle
//
// Note:
//   the fpout handle shouldn't be NULL.
//
******************************************************************************/
void output_frame_mpeg4 (FILE *fpout, sample_picture *picture) 
{
    int     i, step;
    Ipp8u   *dst_y, *dst_u, *dst_v;

    dst_y = picture->pic_plane[0];
    dst_u = picture->pic_plane[1];
    dst_v = picture->pic_plane[2];
    
    /* Y plane */
    step = picture->pic_plane_step[0];
    for(i = 0; i<picture->pic_height; i++) {
        fwrite(dst_y, sizeof(char), picture->pic_width, fpout);
        dst_y += step;          
    }
    /* U plane */
    step = picture->pic_plane_step[1];
    for(i = 0; i<picture->pic_height/2; i++) {
        fwrite(dst_u, sizeof(char), picture->pic_width/2, fpout);
        dst_u += step;      
    }
    /* V plane */
    step = picture->pic_plane_step[2];
    for(i = 0; i<picture->pic_height/2; i++) {
        fwrite(dst_v, sizeof(char), picture->pic_width/2, fpout);
        dst_v += step;
    }
    
}


/*****************************************************************************
// Name:             main
// Description:      Entry function for MPEG4 simple profile decoder
//
// Returns:          0:       decoding okay
//                   others:  decoding fail
*****************************************************************************/
int main (int argc, char *argv[])
{
    FILE                *fpin = NULL, *fpout = NULL;    
    sample_picture      pic;
    sample_bitstream    stream_buf;
    mp4_dec_state       dec_state;
    sample_status       ret_code;       /* return value */
    int                 end_flag = 0, last_frame_flag = 0;
    
    /* argument check */
    if (3 > argc)
    {
        printf("Usage: MPEG4Decoder.exe   infile   outfile!\n"
               "       infile : .cmp input  filename\n"
               "       outfile: .yuv output filename\n");
        return -1;
    }
    
    /* open input .cmp file handle */
    fpin = fopen(argv[1], "rb");
    if (!fpin)
    {
        printf("Can't open input cmp file!\n");
        return -1;
    }

    /* open output .yuv file handle */
    fpout = fopen(argv[2], "wb");
    if (!fpout)
    {
        printf("Can't open output yuv file!\n");
        return -1;
    }
    
    /* init input video bitstream buffer */
    ret_code = init_input_video_buffer(&stream_buf);
    if (ret_code != SAMPLE_STATUS_NOERR) {
        printf("Init input video bitstream buffer error!\n");
        return -1;
    }

    /* load bitstream into buffer for the 1st time */
    ret_code = load_video_buffer(&stream_buf, fpin);
    if (ret_code != SAMPLE_STATUS_NOERR) {
        release_input_video_buffer(&stream_buf);
        printf ("Empty buffer error!\n");
        return -1;
    }

    /* init decoder state struct */
    ret_code = decoder_init_alloc_mpeg4(&stream_buf, &dec_state);    
    if (ret_code != SAMPLE_STATUS_NOERR) {
        release_input_video_buffer(&stream_buf);
        printf ("Init decoder state error!\n");
        return -1;
    }

    /* decoding loop */
    while (!end_flag) 
    {
        /* decode video stream frame by frame */
        ret_code = decode_mpeg4(&stream_buf, &pic, &dec_state);

        switch (ret_code)
        {
        /* one frame has been decoded successfully */
        case SAMPLE_STATUS_NOERR:
            output_frame_mpeg4(fpout, &pic);
            /* if it's the last frame, exit the decoding loop */
            if (1 == last_frame_flag) {
                end_flag = 1;
            }
            break;
        
        /* next sync code is not found in the buffer */
        case SAMPLE_STATUS_SYNCNOTFOUND_ERR:
            /* not end of input .cmp file stream */
            if (!feof(fpin)) {
                /* load bitstream into buffer to fill it up */
                if (SAMPLE_STATUS_NOERR
                    != load_video_buffer(&stream_buf, fpin)) {
                    /* no new bits loaded, this could happen if the buffer
                    // length is less than one frame of raw stream or the 
                    // sync code is missing at all */
                    end_flag = 1;                   
                };
            } else {
                /* to decode the last frame in buffer */
                last_frame_flag = 1;
                /* insert sync code in the end of the stream to provide error
                // protection boundary for the last frame */
                insert_sc_mpeg4 (&stream_buf);
            }
            break;

        default:
            /* exceptions */
            end_flag = 1;
        }
    }

    /* print the final decoding state */
    switch (ret_code)
    {
    case SAMPLE_STATUS_NOERR:
        printf("Everything is okay!\n");
        break;
    case SAMPLE_STATUS_ERR:
        printf("Unknown/Unspecified error!\n");
        break;
    case SAMPLE_STATUS_NOMEM_ERR:
        printf("Memory allocation failed!\n");
        break;
    case SAMPLE_STATUS_BADARG_ERR:
        printf("Bad argument error!\n");
        break;
    case SAMPLE_STATUS_SYNCNOTFOUND_ERR:
        printf("Miss synchronize code!\n");
        break;
    case SAMPLE_STATUS_INPUT_ERR:
        printf("Wrong input parameter!\n");
        break;
    case SAMPLE_STATUS_NOTSUPPORTED_ERR:
        printf("Not support in current version yet!\n");
        break;
    default:
        printf("Out of control!\n");
        break;
    }

    /* free decoder state struct working buffer */
    decoder_free_mpeg4(&dec_state);

    /* free input video bitstream buffer */
    release_input_video_buffer(&stream_buf);

    /* close the input and output file handle */
    fclose (fpout); 
    fclose (fpin);

    return (SAMPLE_STATUS_NOERR == ret_code) ? 0 : -1;
}