real_rmff.c

vlc源码

/*
 * Copyright (C) 2002-2003 the xine project
 *
 * This file is part of xine, a free video player.
 *
 * xine is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * xine is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA
 *
 * $Id: 73dc65580715bd8f5b68394f4527ef6bc5a695d4 $
 *
 * functions for real media file format
 * adopted from joschkas real tools
 */

#include "real.h"

#define BE_16(x)  ((((uint8_t*)(x))[0] << 8) | ((uint8_t*)(x))[1])
#define BE_32(x)  ((((uint8_t*)(x))[0] << 24) | \
                   (((uint8_t*)(x))[1] << 16) | \
                   (((uint8_t*)(x))[2] << 8) | \
                    ((uint8_t*)(x))[3])

/*
 * writes header data to a buffer
 */

static int rmff_dump_fileheader(rmff_fileheader_t *fileheader, uint8_t *buffer, int bufsize) {
    if (!fileheader) return 0;
    if (bufsize < RMFF_FILEHEADER_SIZE)
        return -1;

    fileheader->object_id=BE_32(&fileheader->object_id);
    fileheader->size=BE_32(&fileheader->size);
    fileheader->object_version=BE_16(&fileheader->object_version);
    fileheader->file_version=BE_32(&fileheader->file_version);
    fileheader->num_headers=BE_32(&fileheader->num_headers);

    memcpy(buffer, fileheader, 8);
    memcpy(&buffer[8], &fileheader->object_version, 2);
    memcpy(&buffer[10], &fileheader->file_version, 8);

    fileheader->size=BE_32(&fileheader->size);
    fileheader->object_version=BE_16(&fileheader->object_version);
    fileheader->file_version=BE_32(&fileheader->file_version);
    fileheader->num_headers=BE_32(&fileheader->num_headers);
    fileheader->object_id=BE_32(&fileheader->object_id);

    return RMFF_FILEHEADER_SIZE;
}

static int rmff_dump_prop(rmff_prop_t *prop, uint8_t *buffer, int bufsize) {

    if (!prop) return 0;
    
    if (bufsize < RMFF_PROPHEADER_SIZE)
        return -1;

    prop->object_id=BE_32(&prop->object_id);
    prop->size=BE_32(&prop->size);
    prop->object_version=BE_16(&prop->object_version);
    prop->max_bit_rate=BE_32(&prop->max_bit_rate);
    prop->avg_bit_rate=BE_32(&prop->avg_bit_rate);
    prop->max_packet_size=BE_32(&prop->max_packet_size);
    prop->avg_packet_size=BE_32(&prop->avg_packet_size);
    prop->num_packets=BE_32(&prop->num_packets);
    prop->duration=BE_32(&prop->duration);
    prop->preroll=BE_32(&prop->preroll);
    prop->index_offset=BE_32(&prop->index_offset);
    prop->data_offset=BE_32(&prop->data_offset);
    prop->num_streams=BE_16(&prop->num_streams);
    prop->flags=BE_16(&prop->flags);

    memcpy(buffer, prop, 8);
    memcpy(&buffer[8], &prop->object_version, 2);
    memcpy(&buffer[10], &prop->max_bit_rate, 36);
    memcpy(&buffer[46], &prop->num_streams, 2);
    memcpy(&buffer[48], &prop->flags, 2);

    prop->size=BE_32(&prop->size);
    prop->object_version=BE_16(&prop->object_version);
    prop->max_bit_rate=BE_32(&prop->max_bit_rate);
    prop->avg_bit_rate=BE_32(&prop->avg_bit_rate);
    prop->max_packet_size=BE_32(&prop->max_packet_size);
    prop->avg_packet_size=BE_32(&prop->avg_packet_size);
    prop->num_packets=BE_32(&prop->num_packets);
    prop->duration=BE_32(&prop->duration);
    prop->preroll=BE_32(&prop->preroll);
    prop->index_offset=BE_32(&prop->index_offset);
    prop->data_offset=BE_32(&prop->data_offset);
    prop->num_streams=BE_16(&prop->num_streams);
    prop->flags=BE_16(&prop->flags);
    prop->object_id=BE_32(&prop->object_id);

    return RMFF_PROPHEADER_SIZE;
}

static int rmff_dump_mdpr(rmff_mdpr_t *mdpr, uint8_t *buffer, int bufsize) {

    int s1, s2, s3;

    if (!mdpr) return 0;
    if (bufsize < RMFF_MDPRHEADER_SIZE + mdpr->type_specific_len +
            mdpr->stream_name_size + mdpr->mime_type_size)
    return -1;

    mdpr->object_id=BE_32(&mdpr->object_id);
    mdpr->size=BE_32(&mdpr->size);
    mdpr->object_version=BE_16(&mdpr->object_version);
    mdpr->stream_number=BE_16(&mdpr->stream_number);
    mdpr->max_bit_rate=BE_32(&mdpr->max_bit_rate);
    mdpr->avg_bit_rate=BE_32(&mdpr->avg_bit_rate);
    mdpr->max_packet_size=BE_32(&mdpr->max_packet_size);
    mdpr->avg_packet_size=BE_32(&mdpr->avg_packet_size);
    mdpr->start_time=BE_32(&mdpr->start_time);
    mdpr->preroll=BE_32(&mdpr->preroll);
    mdpr->duration=BE_32(&mdpr->duration);

    memcpy(buffer, mdpr, 8);
    memcpy(&buffer[8], &mdpr->object_version, 2);
    memcpy(&buffer[10], &mdpr->stream_number, 2);
    memcpy(&buffer[12], &mdpr->max_bit_rate, 28);
    memcpy(&buffer[40], &mdpr->stream_name_size, 1);
    s1=mdpr->stream_name_size;
    memcpy(&buffer[41], mdpr->stream_name, s1);

    memcpy(&buffer[41+s1], &mdpr->mime_type_size, 1);
    s2=mdpr->mime_type_size;
    memcpy(&buffer[42+s1], mdpr->mime_type, s2);

    mdpr->type_specific_len=BE_32(&mdpr->type_specific_len);
    memcpy(&buffer[42+s1+s2], &mdpr->type_specific_len, 4);
    mdpr->type_specific_len=BE_32(&mdpr->type_specific_len);
    s3=mdpr->type_specific_len;
    memcpy(&buffer[46+s1+s2], mdpr->type_specific_data, s3);

    mdpr->size=BE_32(&mdpr->size);
    mdpr->stream_number=BE_16(&mdpr->stream_number);
    mdpr->max_bit_rate=BE_32(&mdpr->max_bit_rate);
    mdpr->avg_bit_rate=BE_32(&mdpr->avg_bit_rate);
    mdpr->max_packet_size=BE_32(&mdpr->max_packet_size);
    mdpr->avg_packet_size=BE_32(&mdpr->avg_packet_size);
    mdpr->start_time=BE_32(&mdpr->start_time);
    mdpr->preroll=BE_32(&mdpr->preroll);
    mdpr->duration=BE_32(&mdpr->duration);
    mdpr->object_id=BE_32(&mdpr->object_id);

    return RMFF_MDPRHEADER_SIZE + s1 + s2 + s3;
}

static int rmff_dump_cont(rmff_cont_t *cont, uint8_t *buffer, int bufsize) {

    int p;

    if (!cont) return 0;
    
    if (bufsize < RMFF_CONTHEADER_SIZE + cont->title_len + cont->author_len + \
            cont->copyright_len + cont->comment_len)
        return -1;

    cont->object_id=BE_32(&cont->object_id);
    cont->size=BE_32(&cont->size);
    cont->object_version=BE_16(&cont->object_version);

    memcpy(buffer, cont, 8);
    memcpy(&buffer[8], &cont->object_version, 2);

    cont->title_len=BE_16(&cont->title_len);
    memcpy(&buffer[10], &cont->title_len, 2);
    cont->title_len=BE_16(&cont->title_len);
    memcpy(&buffer[12], cont->title, cont->title_len);
    p=12+cont->title_len;

    cont->author_len=BE_16(&cont->author_len);
    memcpy(&buffer[p], &cont->author_len, 2);
    cont->author_len=BE_16(&cont->author_len);
    memcpy(&buffer[p+2], cont->author, cont->author_len);
    p+=2+cont->author_len;

    cont->copyright_len=BE_16(&cont->copyright_len);
    memcpy(&buffer[p], &cont->copyright_len, 2);
    cont->copyright_len=BE_16(&cont->copyright_len);
    memcpy(&buffer[p+2], cont->copyright, cont->copyright_len);
    p+=2+cont->copyright_len;

    cont->comment_len=BE_16(&cont->comment_len);
    memcpy(&buffer[p], &cont->comment_len, 2);
    cont->comment_len=BE_16(&cont->comment_len);
    memcpy(&buffer[p+2], cont->comment, cont->comment_len);

    cont->size=BE_32(&cont->size);
    cont->object_version=BE_16(&cont->object_version);
    cont->object_id=BE_32(&cont->object_id);

    return RMFF_CONTHEADER_SIZE + cont->title_len + cont->author_len + \
        cont->copyright_len + cont->comment_len;
}

static int rmff_dump_dataheader(rmff_data_t *data, uint8_t *buffer, int bufsize) {

  if (!data) return 0;
  
  if (bufsize < RMFF_DATAHEADER_SIZE)
      return -1;


  data->object_id=BE_32(&data->object_id);
  data->size=BE_32(&data->size);
  data->object_version=BE_16(&data->object_version);
  data->num_packets=BE_32(&data->num_packets);
  data->next_data_header=BE_32(&data->next_data_header);

  memcpy(buffer, data, 8);
  memcpy(&buffer[8], &data->object_version, 2);
  memcpy(&buffer[10], &data->num_packets, 8);

  data->num_packets=BE_32(&data->num_packets);
  data->next_data_header=BE_32(&data->next_data_header);
  data->size=BE_32(&data->size);
  data->object_version=BE_16(&data->object_version);
  data->object_id=BE_32(&data->object_id);

  return RMFF_DATAHEADER_SIZE;
}

int rmff_dump_header(rmff_header_t *h, void *buf_gen, int max) {
    uint8_t *buffer = buf_gen;

    int written=0, size;
    rmff_mdpr_t **stream=h->streams;

    if ((size=rmff_dump_fileheader(h->fileheader, &buffer[written], max)) < 0)
        return -1;
    
    written += size;
    max -= size;

    if ((size=rmff_dump_prop(h->prop, &buffer[written], max)) < 0)
        return -1;
    
    written += size;
    max -= size;

    if ((size=rmff_dump_cont(h->cont, &buffer[written], max)) < 0)
        return -1;

    written += size;
    max -= size;

    if (stream) {
        while(*stream) {
            if ((size=rmff_dump_mdpr(*stream, &buffer[written], max)) < 0)
                return -1;
            written += size;
            max -= size;
            stream++;
        }
    }

    if ((size=rmff_dump_dataheader(h->data, &buffer[written], max)) < 0)
        return -1;
    
    written+=size;

    return written;
}

void rmff_dump_pheader(rmff_pheader_t *h, char *data) {

  data[0]=(h->object_version>>8) & 0xff;
  data[1]=h->object_version & 0xff;
  data[2]=(h->length>>8) & 0xff;
  data[3]=h->length & 0xff;
  data[4]=(h->stream_number>>8) & 0xff;
  data[5]=h->stream_number & 0xff;
  data[6]=(h->timestamp>>24) & 0xff;
  data[7]=(h->timestamp>>16) & 0xff;
  data[8]=(h->timestamp>>8) & 0xff;
  data[9]=h->timestamp & 0xff;
  data[10]=h->reserved;
  data[11]=h->flags;
}

rmff_fileheader_t *rmff_new_fileheader(uint32_t num_headers) {

  rmff_fileheader_t *fileheader = malloc(sizeof(rmff_fileheader_t));
  if( !fileheader ) return NULL;

  memset(fileheader, 0, sizeof(rmff_fileheader_t));
  fileheader->object_id=RMF_TAG;
  fileheader->size=18;
  fileheader->object_version=0;
  fileheader->file_version=0;
  fileheader->num_headers=num_headers;

  return fileheader;
}

rmff_prop_t *rmff_new_prop (
  uint32_t max_bit_rate,
  uint32_t avg_bit_rate,
  uint32_t max_packet_size,
  uint32_t avg_packet_size,
  uint32_t num_packets,
  uint32_t duration,
  uint32_t preroll,
  uint32_t index_offset,
  uint32_t data_offset,