mp4ebuff.c

Intel提供的在PCA(例如Sitsang开发板)使用IPP4.0库的MPEG-4编码源程序

/******************************************************************************
//               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:    Stream buffer processing functions of MPEG-4 video encoder
//                  sample code for Intel(R) Integrated Performance Primitives.
//  Functions List:
//		put_bits_mpeg4()
//		dump_video_buffer()
//		load_extend_picture()
//      init_output_video_buffer()
//      release_output_video_buffer()
******************************************************************************/

#include <memory.h>
#include <malloc.h>
#include "sampmp4.h"

/******************************************************************************
// Name:            load_extend_picture
// Description:     Load one frame (picture) of YUV4:2:0 raw data to buffer,
//                  and expand its height and width to be multiples of 16.
//
// Input Arguments:
//		fpin        Pointer to input file stream buffer
//      pic	        Pointer to input bitstream buffer structure of MPEG-4
//                  encoder
//
// Output Arguments:
//      pic         Pointer to updated input bitstream buffer structure of
//                  MPEG-4 encoder with loaded raw data.
//
// Return:  None
******************************************************************************/
void load_extend_picture(FILE *fpin, sample_picture *pic)
{    
    Ipp8u *tmp_ptr = NULL;
    int   i = 0, j = 0, w_rim = 0, h_rim = 0;
    
    /* copy y plane */
    tmp_ptr = pic->pic_plane[0];
    for (i = 0; i < pic->pic_height; i++) {
        fread((void*)tmp_ptr, 1, pic->pic_width, fpin);
        tmp_ptr += pic->pic_plane_step[0];
    }

    /* copy u plane */
    tmp_ptr = pic->pic_plane[1];
    for (i = 0; i < pic->pic_height/2; i++) {
        fread((void*)tmp_ptr, 1, pic->pic_width/2, fpin);
        tmp_ptr += pic->pic_plane_step[1];
    }

    /* copy v plane */
    tmp_ptr = pic->pic_plane[2];
    for (i = 0; i < pic->pic_height/2; i++) {
        fread((void*)tmp_ptr, 1, pic->pic_width/2, fpin);
        tmp_ptr += pic->pic_plane_step[2];
    }

    /* extend the picture width to be mutiples of MacroBlocks */
    w_rim = pic->pic_width & 15;
    if (w_rim) {
        w_rim = 16 - w_rim;
        /* entend y plane */
        tmp_ptr = (Ipp8u*)pic->pic_plane[0] + pic->pic_width - 1;
        for (i = 0; i < pic->pic_height; i++) {            
            for (j = 1; j <= w_rim; j++) {
                tmp_ptr[j] = tmp_ptr[0];
            }
            tmp_ptr += pic->pic_plane_step[0];
        }
        
        /* extend u plane */
        tmp_ptr = (Ipp8u*)pic->pic_plane[1] + pic->pic_width/2 - 1;
        for (i = 0; i < pic->pic_height/2; i++) {
            for (j = 1; j <= w_rim/2; j++) {
                tmp_ptr[j] = tmp_ptr[0];
            }
            tmp_ptr += pic->pic_plane_step[1];
        }
        
        /* extend v plane */
        tmp_ptr = (Ipp8u*)pic->pic_plane[2] + pic->pic_width/2 - 1;
        for (i = 0; i < pic->pic_height/2; i++) {
            for (j = 1; j <= w_rim/2; j++) {
                tmp_ptr[j] = tmp_ptr[0];
            }
            tmp_ptr += pic->pic_plane_step[2];
        }
    }

    /* extend the picture height to mutiples of MacroBlocks */
    h_rim = pic->pic_height & 15;
    if (h_rim) {
        h_rim = 16 - h_rim;
        /* extend y plane */
        tmp_ptr = (Ipp8u*)pic->pic_plane[0] + pic->pic_plane_step[0]
            * (pic->pic_height - 1);
        for (i = 0; i < pic->pic_width + w_rim; i++) {
            for (j = 1; j <= h_rim; j++) {
                tmp_ptr[j * pic->pic_plane_step[0]] = tmp_ptr[0];
            }
            tmp_ptr ++;
        }
        
        /* extend u plane */
        tmp_ptr = (Ipp8u*)pic->pic_plane[1] + pic->pic_plane_step[1]
            * (pic->pic_height/2 - 1);
        for (i = 0; i < (pic->pic_width + w_rim)/2; i++) {
            for (j = 1; j <= h_rim/2; j++) {
                tmp_ptr[j * pic->pic_plane_step[1]] = tmp_ptr[0];
            }
            tmp_ptr ++;
        }

        /* extend v plane */
        tmp_ptr = (Ipp8u*)pic->pic_plane[2] + pic->pic_plane_step[2]
            * (pic->pic_height/2 - 1);
        for (i = 0; i < (pic->pic_width + w_rim)/2; j++) {
            for (j = 1; j <= h_rim/2; j++) {
                tmp_ptr[j * pic->pic_plane_step[2]] = tmp_ptr[0];
            }
            tmp_ptr ++;
        }
    }

    return;
}

/******************************************************************************
// Name:                put_bits_mpeg4
// Description:         Write N bits to output video buffer
// Input Arguments: 
//      stream_buf      Pointer to the destination compressed video bitstream
//      n_bits          Number of bits to write, i.e., N (N <= 32)
//      data            Data containing the N bits
//
//  Output Arguments:
//      stream_buf      Pointer to the updated output video stream after the N
//                      bits are filled in
//
//  Returns:    
//      None
******************************************************************************/
void put_bits_mpeg4(sample_bitstream *stream_buf, Ipp32u data, int n_bits)
{
    int odd_bits = 0, n_bytes = 0;

    /* input data is written in big endian */
    data = data << (32 - n_bits);

    if (stream_buf->bs_cur_bitoffset) {

        odd_bits = 8 - stream_buf->bs_cur_bitoffset;
        *stream_buf->bs_cur_byte++ |= data >> (32 - odd_bits);
        data    = data << odd_bits;
        n_bits -= odd_bits;        
    }

    if (0 < n_bits) {
        n_bytes = (n_bits + 7) / 8;
        while (n_bytes--) {
            *stream_buf->bs_cur_byte++ = (unsigned char)(data >> 24);
            data = data << 8;
        }
        stream_buf->bs_cur_bitoffset = n_bits & 7;
    } else {
        stream_buf->bs_cur_bitoffset  = (8 + n_bits) & 7;
    }

    if (stream_buf->bs_cur_bitoffset) {
        stream_buf->bs_cur_byte --;
    }
    return;
}


/******************************************************************************
// Name:                    dump_video_buffer
// Description:             Output video bitstream from buffer to file stream
//
// Input Arguments:
//      stream_buf          Pointer to the video bitstream buffer
//      fpout               Pointer to the output file stream
//
// Output Arguments:
//      stream_buf          Pointer to updated video bitstream buffer
//
// Returns:
//      SAMPLE_STATUS_NOERR If succeeds
//      SAMPLE_STATUS_ERR   If error occurs in writing data to file
******************************************************************************/
sample_status dump_video_buffer(sample_bitstream *stream_buf, FILE *fpout)
{
    unsigned int data_len = 0;
    
    data_len = stream_buf->bs_cur_byte - stream_buf->bs_buffer;
    if (fwrite((void*)stream_buf->bs_buffer, 1, data_len, fpout) != data_len) {
        return SAMPLE_STATUS_ERR;
    }
    
    if (stream_buf->bs_cur_bitoffset) {
        /* copy remaining bits */
        stream_buf->bs_buffer[0] = stream_buf->bs_cur_byte[0];
    }
    stream_buf->bs_cur_byte = stream_buf->bs_buffer;
    return SAMPLE_STATUS_NOERR;
}


/******************************************************************************
// Name:                        init_output_video_buffer
// Description:                 Initialize the output video bitstream buffer
//
// Input Arguments:
//      stream_buf              Pointer to output video bitstream buffer
//      size                    Bytes to allocate for the bitstream buffer
//
// Output Arguments:
//      stream_buf              Pointer to allocated video bitstream buffer
//
// Returns:
//     SAMPLE_STATUS_NOERR      If succeeds
//     SAMPLE_STATUS_NOMEM_ERR  If memory allocation fails
******************************************************************************/
sample_status init_output_video_buffer (sample_bitstream *stream_buf, int size)
{
    /* reset the struct to zeroes */
    memset((void*)stream_buf, 0, sizeof(sample_bitstream));

    /* initialize the output video bitstream buffer which is large enough
    // to store one compressed frame plus header */
    stream_buf->bs_buffer = (Ipp8u*)malloc(size);

    if (NULL == stream_buf->bs_buffer) {
        /* memory allocation fails */
        return SAMPLE_STATUS_NOMEM_ERR;
    }
    else {
        /* reset the newly allocated buffer to zeroes */
        memset (stream_buf->bs_buffer, 0, size);
    }

    /* set current pointer to the start of buffer for there's no data written
    // at beginning */
    stream_buf->bs_cur_byte = stream_buf->bs_buffer;
    stream_buf->bs_cur_bitoffset = 0;
    stream_buf->bs_bytelen = size;

    return SAMPLE_STATUS_NOERR;
}

/*****************************************************************************
// Name:                    release_output_video_buffer
// Description:             Release the output video bitstream buffer
//
// Input Arguments:
//      stream_buf          Pointer to output video bitstream buffer
//
// Output Arguments:
//      stream_buf          Pointer to released video bitstream buffer
//
// Returns:
//     SAMPLE_STATUS_NOERR  If succeeds
*****************************************************************************/
sample_status release_output_video_buffer (sample_bitstream *stream_buf)
{
    if (stream_buf->bs_buffer) {
        free(stream_buf->bs_buffer);
        stream_buf->bs_buffer = NULL;
    }

    return SAMPLE_STATUS_NOERR;
}