Traduire en PHP du code C ou C++

Merci pour ta réponse mais c'est déjà le code d'une extension php.

Ce que je veux, c'est l'écrire en php directement car je ne peux pas ajouter d'extensions à php sur mon hébergement partagé.

Je pense qu'il n'y a aura pas de problème d'incompatibilité pour convertir ce code c/c++ en PHP car c'est en fait un simple streamer de vidéos au format MP4/H.264/AAC.

psstream.c

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#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
 
#include <ctype.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <time.h>
#include <unistd.h>
 
#include "php.h"
#include "php_ini.h"
#include "ext/standard/info.h"
#include "php_psstream.h"
#include "moov.h"
#include "php_main.h"
#include "SAPI.h"
 
static int le_psstream;
 
PHP_INI_BEGIN()
PHP_INI_ENTRY("psstream.bandwidth_limit", "0", PHP_INI_ALL, NULL)
PHP_INI_ENTRY("psstream.bandwidth_chunk_size", "204800", PHP_INI_ALL, NULL)
PHP_INI_ENTRY("psstream.bandwidth_chunk_interval", "0.2", PHP_INI_ALL, NULL)
PHP_INI_END()
 
zend_function_entry psstream_functions[] = {
    PHP_FE(psstream_mp4,NULL)
    PHP_FE(psstream_flv,NULL)
    {NULL, NULL, NULL}
};
 
zend_module_entry psstream_module_entry = {
#if ZEND_MODULE_API_NO >= 20010901
    STANDARD_MODULE_HEADER,
#endif
    "psstream",
    psstream_functions,
    PHP_MINIT(psstream),
    PHP_MSHUTDOWN(psstream),
    PHP_RINIT(psstream),
    PHP_RSHUTDOWN(psstream),
    PHP_MINFO(psstream),
#if ZEND_MODULE_API_NO >= 20010901
    "0.1",
#endif
    STANDARD_MODULE_PROPERTIES
};
 
#ifdef COMPILE_DL_PSSTREAM
ZEND_GET_MODULE(psstream)
#endif
 
 
// Startup/Shutdown functions
 
PHP_MINIT_FUNCTION(psstream)
{
    REGISTER_INI_ENTRIES();
    return SUCCESS;
}
 
PHP_MSHUTDOWN_FUNCTION(psstream)
{
    UNREGISTER_INI_ENTRIES();
    return SUCCESS;
}
 
PHP_RINIT_FUNCTION(psstream)
{
    return SUCCESS;
}
 
PHP_RSHUTDOWN_FUNCTION(psstream)
{
    return SUCCESS;
}
 
PHP_MINFO_FUNCTION(psstream)
{
    php_info_print_table_start();
    php_info_print_table_header(2, "psstream support", "enabled");
    php_info_print_table_row(2, "psstream version", "1.0");
    php_info_print_table_end();
 
    DISPLAY_INI_ENTRIES();
}
 
 
// Useful macros
 
#define INIT_HEADERS sapi_header_line psstream_sapi_header_line = {0}
 
#define ADD_HEADER(h) \
    psstream_sapi_header_line.line = h; \
    psstream_sapi_header_line.line_len = strlen(psstream_sapi_header_line.line); \
    sapi_header_op(SAPI_HEADER_ADD, &psstream_sapi_header_line);
 
#define REPLACE_HEADER(h) \
    psstream_sapi_header_line.line = h; \
    psstream_sapi_header_line.line_len = strlen(psstream_sapi_header_line.line); \
    sapi_header_op(SAPI_HEADER_REPLACE, &psstream_sapi_header_line);
 
#define SEND_HEADERS sapi_send_headers();
 
#define STREAMING_ERROR(t) php_error(E_WARNING, "STREAMING ERROR: %s", t)
 
 
// Helper functions
 
#define ATOM_PREAMBLE_SIZE 8
 
void write_char(unsigned char* outbuffer, int value) {
    outbuffer[0] = (unsigned char)(value);
}
 
void write_int32(unsigned char* outbuffer, long value) {
    outbuffer[0] = (unsigned char)((value >> 24) & 0xff);
    outbuffer[1] = (unsigned char)((value >> 16) & 0xff);
    outbuffer[2] = (unsigned char)((value >> 8) & 0xff);
    outbuffer[3] = (unsigned char)((value >> 0) & 0xff);
}
 
struct atom_t {
    unsigned char type_[4];
    uint64_t size_;
    uint64_t start_;
    uint64_t end_;
};
 
unsigned int atom_header_size(unsigned char* atom_bytes) {
    return (atom_bytes[0] << 24) +
           (atom_bytes[1] << 16) +
           (atom_bytes[2] << 8) +
           (atom_bytes[3]);
}
 
int atom_read_header(FILE* infile, struct atom_t* atom) {
    unsigned char atom_bytes[ATOM_PREAMBLE_SIZE];
 
    atom->start_ = ftell(infile);
 
    if (!fread(atom_bytes, ATOM_PREAMBLE_SIZE, 1, infile)) {
        return 0;
    }
 
    memcpy(&atom->type_[0], &atom_bytes[4], 4);
    atom->size_ = atom_header_size(atom_bytes);
    atom->end_ = atom->start_ + atom->size_;
 
    return 1;
}
 
void atom_write_header(unsigned char* outbuffer, struct atom_t* atom) {
    int i;
    write_int32(outbuffer, atom->size_);
 
    for(i = 0; i != 4; ++i) {
        write_char(outbuffer + 4 + i, atom->type_[i]);
    }
}
 
int atom_is(struct atom_t const* atom, const char* type) {
    return (atom->type_[0] == type[0] &&
            atom->type_[1] == type[1] &&
            atom->type_[2] == type[2] &&
            atom->type_[3] == type[3]);
}
 
void atom_skip(FILE* infile, struct atom_t const* atom) {
    fseek(infile, atom->end_, SEEK_SET);
}
 
void atom_print(struct atom_t const* atom) {
    printf("Atom(%c%c%c%c,%lld)\n", atom->type_[0], atom->type_[1],
        atom->type_[2], atom->type_[3], atom->size_);
}
 
double precise_time() {
    struct timeval tp = {0};
    struct timezone tz = {0};
 
    if (gettimeofday(&tp, &tz))
            return 0;
 
    return (double)(tp.tv_sec + tp.tv_usec) / 1000000.00;
}
 
 
// Main functions
 
/* MP4 (H264) pseudo-streaming.
 * This function does nothing to check if the requested file is really a valid MP4/H264 file.
 */
PHP_FUNCTION(psstream_mp4)
{
    char *path;
    unsigned long path_size;
    double t_start = 0.0;
    double t_end = 0.0;
 
    if(zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "s|d", &path, &path_size, &t_start) == FAILURE)
        WRONG_PARAM_COUNT;
 
    if (t_start < 0) {
        php_error(E_WARNING, "Invalid start offset!");
        RETURN_FALSE;
    }
 
    FILE* infile;
    struct atom_t ftyp_atom;
    struct atom_t moov_atom;
    struct atom_t mdat_atom;
    unsigned char* moov_data = 0;
    unsigned char* ftyp_data = 0;
    struct stat filestat;
 
    if(VCWD_STAT(path, &filestat) || !(infile = VCWD_FOPEN(path, "rb"))) {
        php_error(E_WARNING, "Could not open file... [%s]", path);
        RETURN_FALSE;
    }
    unsigned long filesize = filestat.st_size;
 
    if (SG(headers_sent)) {
        php_error(E_WARNING, "Can not start streaming: headers were already sent!");
        RETURN_FALSE;
    }
 
    // Send H264 structure
    struct atom_t leaf_atom;
 
    while(ftell(infile) < filesize) {
        if(!atom_read_header(infile, &leaf_atom))
            break;
 
        atom_print(&leaf_atom);
 
        if(atom_is(&leaf_atom, "ftyp")) {
            ftyp_atom = leaf_atom;
            ftyp_data = malloc(ftyp_atom.size_);
            fseek(infile, ftyp_atom.start_, SEEK_SET);
            if (!fread(ftyp_data, ftyp_atom.size_, 1, infile)) {
                STREAMING_ERROR("file read error");
                RETURN_FALSE;
            }
        }
        else if(atom_is(&leaf_atom, "moov")) {
            moov_atom = leaf_atom;
            moov_data = malloc(moov_atom.size_);
            fseek(infile, moov_atom.start_, SEEK_SET);
            if (!fread(moov_data, moov_atom.size_, 1, infile)) {
                STREAMING_ERROR("file read error");
                RETURN_FALSE;
            }
        }
        else if(atom_is(&leaf_atom, "mdat")) {
            mdat_atom = leaf_atom;
        }
        atom_skip(infile, &leaf_atom);
    }
    fseek(infile, 0, SEEK_SET);
 
    if(!moov_data) {
        STREAMING_ERROR("null/empty moov_data");
        RETURN_FALSE;
    }
 
    unsigned int mdat_start = (ftyp_data ? ftyp_atom.size_ : 0) + moov_atom.size_;
 
    if(!moov_seek(moov_data,
            &moov_atom.size_,
            t_start, t_end,
            &mdat_atom.start_, &mdat_atom.size_,
            mdat_start - mdat_atom.start_)) {
        STREAMING_ERROR("moov_seek failed");
        RETURN_FALSE;
    }
 
    // Compute start/end file offsets
    unsigned long start = mdat_atom.start_ + ATOM_PREAMBLE_SIZE;
    unsigned long end = start + mdat_atom.size_ - ATOM_PREAMBLE_SIZE;
 
    // Send headers
    char last_modified[200];
    time_t t = time(NULL);
    struct tm *tmp;
    if (tmp = localtime(&t)) {
        strftime(last_modified, sizeof(last_modified), "Last-Modified: %a, %d %B %y %H:%M:%S GMT", tmp);
    }
 
    unsigned long delta = end - start;
    delta += ftyp_data ? ftyp_atom.size_ : 0;
    delta += moov_atom.size_;
    delta += ATOM_PREAMBLE_SIZE;
 
    char content_length[100];
    sprintf(content_length, "Content-Length: %lu", delta);
 
    INIT_HEADERS;
    ADD_HEADER("Content-Type: video/mp4");
    ADD_HEADER("Expires: Thu, 19 Nov 1981 08:52:00 GMT");
    ADD_HEADER(last_modified);
    ADD_HEADER("Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0");
    ADD_HEADER("Pragma: no-cache");
    ADD_HEADER(content_length);
    SEND_HEADERS;
 
    // Send meta atoms
    if(ftyp_data) {
        PHPWRITE(ftyp_data, ftyp_atom.size_);
        free(ftyp_data);
    }
 
    PHPWRITE(moov_data, moov_atom.size_);
    free(moov_data);
 
    unsigned char mdat_bytes[ATOM_PREAMBLE_SIZE];
    atom_write_header(mdat_bytes, &mdat_atom);
    PHPWRITE(mdat_bytes, ATOM_PREAMBLE_SIZE);
 
    // Configure options
    int bandwidth_limit = INI_BOOL("psstream.bandwidth_limit");
    unsigned long bandwidth_chunk_size = INI_INT("psstream.bandwidth_chunk_size");
    double bandwidth_chunk_interval = INI_FLT("psstream.bandwidth_chunk_interval");
 
    if (bandwidth_chunk_size < 1024) bandwidth_chunk_size = 1024;
    else if (bandwidth_chunk_size > 1048576) bandwidth_chunk_size = 1048576;
 
    if (bandwidth_chunk_interval < 0.1) bandwidth_chunk_interval = 0.1;
    else if (bandwidth_chunk_interval > 2) bandwidth_chunk_interval = 2;
 
    unsigned long chunk_size = bandwidth_limit ? bandwidth_chunk_size : 204800;
 
    // Set some ini settings
    zend_alter_ini_entry("session.cache_limiter", sizeof("session.cache_limiter"),
        "nocache", sizeof("nocache"), PHP_INI_USER, PHP_INI_STAGE_RUNTIME);
 
    // Stream data
    double t_delta = 0.0;
    unsigned long result;
 
    unsigned char *buffer = (unsigned char*)malloc(chunk_size);
    if (!buffer) {
        RETURN_FALSE;
    }
 
    fseek(infile, start, SEEK_SET);
    while(start < end) {
 
        if (end - start < chunk_size) {
            chunk_size = end - start;
        }
 
        t_start = precise_time();
 
        result = fread(buffer, 1, chunk_size, infile);
 
        if (result != chunk_size) {
            free(buffer);
            RETURN_FALSE;
        }
 
        PHPWRITE(buffer, chunk_size);
        start += chunk_size;
 
        if(bandwidth_limit) {
            t_end = precise_time();
            t_delta = t_end - t_start;
 
            if(t_delta < bandwidth_chunk_interval) {
                usleep(bandwidth_chunk_interval * 1000000 - t_delta * 1000000);
            }
        }
    }
 
    // Close file
    fclose(infile);
    free(buffer);
 
    RETURN_TRUE;
}
 
/* Classic FLV pseudo-streaming.
 * This function does nothing to check if the requested file is really a valid FLV file.
 */
PHP_FUNCTION(psstream_flv)
{
    #define FLV_SIGNATURE "FLV\x1\x1\0\0\0\x9\0\0\0\x9"
 
    char *path;
    unsigned long path_size;
    unsigned long start = 0;
 
    if(zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "s|l", &path, &path_size, &start) == FAILURE)
        WRONG_PARAM_COUNT;
 
    FILE* infile;
    struct stat filestat;
 
    if(VCWD_STAT(path, &filestat) || !(infile = VCWD_FOPEN(path, "rb"))) {
        php_error(E_WARNING, "Could not open file... [%s]", path);
        RETURN_FALSE;
    }
    unsigned long end = filestat.st_size;
 
    if (start < 0 || start >= end) {
        php_error(E_WARNING, "Invalid start offset!");
        RETURN_FALSE;
    }
 
    if (SG(headers_sent)) {
        php_error(E_WARNING, "Can not start streaming: headers were already sent!");
        RETURN_FALSE;
    }
 
    // Send headers
    char last_modified[200];
    time_t t = time(NULL);
    struct tm *tmp;
    if (tmp = localtime(&t)) {
        strftime(last_modified, sizeof(last_modified), "Last-Modified: %a, %d %B %y %H:%M:%S GMT", tmp);
    }
 
    char content_length[100];
    sprintf(content_length, "Content-Length: %lu", end - start + sizeof(FLV_SIGNATURE) - 1);
 
    INIT_HEADERS;
    ADD_HEADER("Content-Type: video/x-flv");
    ADD_HEADER("Expires: Thu, 19 Nov 1981 08:52:00 GMT");
    ADD_HEADER(last_modified);
    ADD_HEADER("Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0");
    ADD_HEADER("Pragma: no-cache");
    ADD_HEADER(content_length);
    SEND_HEADERS;
 
    // Send FLV signature
    if (start > 0) {
        PHPWRITE(FLV_SIGNATURE, sizeof(FLV_SIGNATURE) - 1);
    }
 
    // Configure options
    int bandwidth_limit = INI_BOOL("psstream.bandwidth_limit");
    unsigned long bandwidth_chunk_size = INI_INT("psstream.bandwidth_chunk_size");
    double bandwidth_chunk_interval = INI_FLT("psstream.bandwidth_chunk_interval");
 
    if (bandwidth_chunk_size < 1024) bandwidth_chunk_size = 1024;
    else if (bandwidth_chunk_size > 1048576) bandwidth_chunk_size = 1048576;
 
    if (bandwidth_chunk_interval < 0.1) bandwidth_chunk_interval = 0.1;
    else if (bandwidth_chunk_interval > 2) bandwidth_chunk_interval = 2;
 
    unsigned long chunk_size = bandwidth_limit ? bandwidth_chunk_size : 204800;
 
    // Set some ini settings
    zend_alter_ini_entry("session.cache_limiter", sizeof("session.cache_limiter"),
        "nocache", sizeof("nocache"), PHP_INI_USER, PHP_INI_STAGE_RUNTIME);
 
    // Stream data
    double t_start = 0.0;
    double t_end = 0.0;
    double t_delta = 0.0;
    unsigned long result;
 
    unsigned char *buffer = (unsigned char*)malloc(chunk_size);
    if (!buffer) {
        RETURN_FALSE;
    }
 
    fseek(infile, start, SEEK_SET);
    while(start < end) {
 
        if (end - start < chunk_size) {
            chunk_size = end - start;
        }
 
        t_start = precise_time();
 
        result = fread(buffer, 1, chunk_size, infile);
 
        if (result != chunk_size) {
            free(buffer);
            RETURN_FALSE;
        }
 
        PHPWRITE(buffer, chunk_size);
        start += chunk_size;
 
        if(bandwidth_limit) {
            t_end = precise_time();
            t_delta = t_end - t_start;
 
            if(t_delta < bandwidth_chunk_interval) {
                usleep(bandwidth_chunk_interval * 1000000 - t_delta * 1000000);
            }
        }
    }
 
    // Close file
    fclose(infile);
    free(buffer);
 
    RETURN_TRUE;
}

moov.c

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/* 
  Uses code snippets from the libquicktime library:
   http://libquicktime.sourceforge.net
 
  The QuickTime File Format PDF from Apple:
    http://developer.apple.com/techpubs/quicktime/qtdevdocs/PDF/QTFileFormat.pdf
*/
 
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <limits.h>
#include <stdint.h>
 
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
 
#ifdef HAVE_STDINT_H
# include <stdint.h>
#endif
#ifdef HAVE_INTTYPES_H
# include <inttypes.h>
#endif
#ifdef HAVE_ZLIB_H
// Compress the MOOV atom. Turn this off for Flash as it doesn't support it.
// # define COMPRESS_MOOV_ATOM
# include <zlib.h>
#endif
 
static int read_char(unsigned char const* buffer)
{
  return buffer[0];
}
 
static unsigned int read_int32(void const* buffer)
{
  unsigned char* p = (unsigned char*)buffer;
  return (p[0] << 24) + (p[1] << 16) + (p[2] << 8) + p[3];
}
 
static void write_int32(void* outbuffer, uint32_t value)
{
  unsigned char* p = (unsigned char*)outbuffer;
  p[0] = (unsigned char)((value >> 24) & 0xff);
  p[1] = (unsigned char)((value >> 16) & 0xff);
  p[2] = (unsigned char)((value >> 8) & 0xff);
  p[3] = (unsigned char)((value >> 0) & 0xff);
}
 
static void write_int64(void* outbuffer, uint64_t value)
{
  unsigned char* p = (unsigned char*)outbuffer;
  write_int32(p + 0, (uint32_t)(value >> 32));
  write_int32(p + 4, (uint32_t)(value >>  0));
}
 
struct atom_t
{
  unsigned char type_[4];
  unsigned int size_;
  unsigned char* start_;
  unsigned char* end_;
};
 
#define ATOM_PREAMBLE_SIZE 8
 
static unsigned int atom_header_size(unsigned char* atom_bytes)
{
  return (atom_bytes[0] << 24) +
         (atom_bytes[1] << 16) +
         (atom_bytes[2] << 8) +
         (atom_bytes[3]);
}
 
static unsigned char* atom_read_header(unsigned char* buffer, struct atom_t* atom)
{
  atom->start_ = buffer;
  memcpy(&atom->type_[0], &buffer[4], 4);
  atom->size_ = atom_header_size(buffer);
  atom->end_ = atom->start_ + atom->size_;
 
  return buffer + ATOM_PREAMBLE_SIZE;
}
 
static unsigned char* atom_skip(unsigned char* buffer, struct atom_t const* atom)
{
  return atom->end_;
}
 
static int atom_is(struct atom_t const* atom, const char* type)
{
  return (atom->type_[0] == type[0] &&
          atom->type_[1] == type[1] &&
          atom->type_[2] == type[2] &&
          atom->type_[3] == type[3])
         ;
}
 
static void atom_print(struct atom_t const* atom)
{
  printf("Atom(%c%c%c%c,%d)\n", atom->type_[0], atom->type_[1],
          atom->type_[2], atom->type_[3], atom->size_);
}
 
#define MAX_TRACKS 8
 
unsigned int stts_get_entries(unsigned char const* stts)
{
  return read_int32(stts + 4);
}
 
void stts_get_sample_count_and_duration(unsigned char const* stts,
  unsigned int idx, unsigned int* sample_count, unsigned int* sample_duration)
{
  unsigned char const* table = stts + 8 + idx * 8;
  *sample_count = read_int32(table);
  *sample_duration = read_int32(table + 4);
}
 
struct stts_table_t
{
  uint32_t sample_count_;
  uint32_t sample_duration_;
};
 
unsigned int ctts_get_entries(unsigned char const* ctts)
{
  return read_int32(ctts + 4);
}
 
void ctts_get_sample_count_and_offset(unsigned char const* ctts,
  unsigned int idx, unsigned int* sample_count, unsigned int* sample_offset)
{
  unsigned char const* table = ctts + 8 + idx * 8;
  *sample_count = read_int32(table);
  *sample_offset = read_int32(table + 4);
}
 
unsigned int ctts_get_samples(unsigned char const* ctts)
{
  unsigned int samples = 0;
  unsigned int entries = ctts_get_entries(ctts);
  unsigned int i;
  for(i = 0; i != entries; ++i)
  {
    unsigned int sample_count;
    unsigned int sample_offset;
    ctts_get_sample_count_and_offset(ctts, i, &sample_count, &sample_offset);
    samples += sample_count;
  }
 
  return samples;
}
 
struct ctts_table_t
{
  uint32_t sample_count_;
  uint32_t sample_offset_;
};
 
struct stsc_table_t
{
  uint32_t chunk_;
  uint32_t samples_;
  uint32_t id_;
};
 
unsigned int stsc_get_entries(unsigned char const* stsc)
{
  return read_int32(stsc + 4);
}
 
void stsc_get_table(unsigned char const* stsc, unsigned int i, struct stsc_table_t *stsc_table)
{
  struct stsc_table_t* table = (struct stsc_table_t*)(stsc + 8);
  stsc_table->chunk_ = read_int32(&table[i].chunk_) - 1;
  stsc_table->samples_ = read_int32(&table[i].samples_);
  stsc_table->id_ = read_int32(&table[i].id_);
}
 
unsigned int stsc_get_chunk(unsigned char* stsc, unsigned int sample)
{
  unsigned int entries = read_int32(stsc + 4);
  struct stsc_table_t* table = (struct stsc_table_t*)(stsc + 8);
 
  if(entries == 0)
  {
    return 0;
  }
  else
//  if(entries == 1)
//  {
//    unsigned int table_samples = read_int32(&table[0].samples_);
//    unsigned int chunk = (sample + 1) / table_samples;
//    return chunk - 1;
//  }
//  else
  {
    unsigned int total = 0;
    unsigned int chunk1 = 1;
    unsigned int chunk1samples = 0;
    unsigned int chunk2entry = 0;
    unsigned int chunk, chunk_sample;
 
    do
    {
      unsigned int range_samples;
      unsigned int chunk2 = read_int32(&table[chunk2entry].chunk_);
      chunk = chunk2 - chunk1;
      range_samples = chunk * chunk1samples;
 
      if(sample < total + range_samples)
        break;
 
      chunk1samples = read_int32(&table[chunk2entry].samples_);
      chunk1 = chunk2;
 
      if(chunk2entry < entries)
      {
        chunk2entry++;
        total += range_samples;
      }
    } while(chunk2entry < entries);
 
    if(chunk1samples)
    {
      unsigned int sample_in_chunk = (sample - total) % chunk1samples;
      if(sample_in_chunk != 0)
      {
        printf("ERROR: sample must be chunk aligned: %d\n", sample_in_chunk);
      }
      chunk = (sample - total) / chunk1samples + chunk1;
    }
    else
      chunk = 1;
 
    chunk_sample = total + (chunk - chunk1) * chunk1samples;
 
    return chunk;
  }
}
 
unsigned int stsc_get_samples(unsigned char* stsc)
{
  unsigned int entries = read_int32(stsc + 4);
  struct stsc_table_t* table = (struct stsc_table_t*)(stsc + 8);
  unsigned int samples = 0;
  unsigned int i;
  for(i = 0; i != entries; ++i)
  {
    samples += read_int32(&table[i].samples_);
  }
  return samples;
}
 
unsigned int stco_get_entries(unsigned char const* stco)
{
  return read_int32(stco + 4);
}
 
uint32_t stco_get_offset(unsigned char const* stco, int idx)
{
  uint32_t const* table = (uint32_t const*)(stco + 8);
  return read_int32(&table[idx]);
}
 
#if 0
void stco_erase(unsigned char* stco, unsigned int chunks_to_delete)
{
  int entries = read_int32(stco + 4);
  long* table = (long*)(stco + 8);
//  unsigned int bytes_to_skip;
 
//  // TODO: remove up to the last chunk. This is problematic as we don't know
//  // the size of the last chunk. For now, we leave the last chunk in 'mdat'.
//  unsigned int stco_end = chunks_to_delete;
//  if(stco_end == entries && entries)
//    --stco_end;
 
//  bytes_to_skip = read_int32(&table[stco_end]) - read_int32(&table[0]);
 
  memmove(&table[0], &table[chunks_to_delete],
          (entries - chunks_to_delete) * sizeof(long));
 
  write_int32(stco + 4, entries - chunks_to_delete);
 
//  return bytes_to_skip;
}
#endif
 
unsigned int stsz_get_sample_size(unsigned char const* stsz)
{
  return read_int32(stsz + 4);
}
 
unsigned int stsz_get_entries(unsigned char const* stsz)
{
  return read_int32(stsz + 8);
}
 
unsigned int stsz_get_size(unsigned char const* stsz, unsigned int idx)
{
  uint32_t const* table = (uint32_t const*)(stsz + 12);
  return read_int32(&table[idx]);
}
 
uint64_t stts_get_duration(unsigned char const* stts)
{
  long duration = 0;
  unsigned int entries = stts_get_entries(stts);
  unsigned int i;
  for(i = 0; i != entries; ++i)
  {
    unsigned int sample_count;
    unsigned int sample_duration;
    stts_get_sample_count_and_duration(stts, i,
                                       &sample_count, &sample_duration);
    duration += sample_duration * sample_count;
  }
 
  return duration;
}
 
unsigned int stts_get_samples(unsigned char const* stts)
{
  unsigned int samples = 0;
  unsigned int entries = stts_get_entries(stts);
  unsigned int i;
  for(i = 0; i != entries; ++i)
  {
    unsigned int sample_count;
    unsigned int sample_duration;
    stts_get_sample_count_and_duration(stts, i,
                                       &sample_count, &sample_duration);
    samples += sample_count;
  }
 
  return samples;
}
 
unsigned int stts_get_sample(unsigned char const* stts, unsigned int time)
{
  unsigned int stts_index = 0;
  unsigned int stts_count;
 
  unsigned int ret = 0;
  unsigned int time_count = 0;
 
  unsigned int entries = stts_get_entries(stts);
  for(; stts_index != entries; ++stts_index)
  {
    unsigned int sample_count;
    unsigned int sample_duration;
    stts_get_sample_count_and_duration(stts, stts_index,
                                       &sample_count, &sample_duration);
    if(time_count + sample_duration * sample_count >= time)
    {
      stts_count = (time - time_count) / sample_duration;
      time_count += stts_count * sample_duration;
      ret += stts_count;
      break;
    }
    else
    {
      time_count += sample_duration * sample_count;
      ret += sample_count;
//      stts_index++;
    }
//    if(stts_index >= table_.size())
//      break;
  }
//  *time = time_count;
  return ret;
}
 
unsigned int stts_get_time(unsigned char const* stts, unsigned int sample)
{
  unsigned int ret = 0;
  unsigned int stts_index = 0;
  unsigned int sample_count = 0;
 
  for(;;)
  {
    unsigned int table_sample_count;
    unsigned int table_sample_duration;
    stts_get_sample_count_and_duration(stts, stts_index,
                                       &table_sample_count, &table_sample_duration);
 
    if(sample_count + table_sample_count > sample)
    {
      unsigned int stts_count = (sample - sample_count);
      ret += stts_count * table_sample_duration;
      break;
    }
    else
    {
      sample_count += table_sample_count;
      ret += table_sample_count * table_sample_duration;
      stts_index++;
    }
  }
  return ret;
}
 
 
struct stbl_t
{
  unsigned char* start_;
//stsd stsd_;               // sample description
  unsigned char* stts_;     // decoding time-to-sample
  unsigned char* stss_;     // sync sample
  unsigned char* stsc_;     // sample-to-chunk
  unsigned char* stsz_;     // sample size
  unsigned char* stco_;     // chunk offset
  unsigned char* ctts_;     // composition time-to-sample
};
 
void stbl_parse(struct stbl_t* stbl, unsigned char* buffer, unsigned int size)
{
  struct atom_t leaf_atom;
  unsigned char* buffer_start = buffer;
  stbl->stss_ = 0;
  stbl->ctts_ = 0;
 
  stbl->start_ = buffer;
 
  while(buffer < buffer_start + size)
  {
    buffer = atom_read_header(buffer, &leaf_atom);
 
    atom_print(&leaf_atom);
 
    if(atom_is(&leaf_atom, "stts"))
    {
      stbl->stts_ = buffer;
    }
    else
    if(atom_is(&leaf_atom, "stss"))
    {
      stbl->stss_ = buffer;
    }
    else
    if(atom_is(&leaf_atom, "stsc"))
    {
      stbl->stsc_ = buffer;
    }
    else
    if(atom_is(&leaf_atom, "stsz"))
    {
      stbl->stsz_ = buffer;
    }
    else
    if(atom_is(&leaf_atom, "stco"))
    {
      stbl->stco_ = buffer;
    }
    else
    if(atom_is(&leaf_atom, "co64"))
    {
      perror("TODO: co64");
    }
    else
    if(atom_is(&leaf_atom, "ctts"))
    {
      stbl->ctts_ = buffer;
    }
 
    buffer = atom_skip(buffer, &leaf_atom);
  }
}
 
struct minf_t
{
  unsigned char* start_;
  struct stbl_t stbl_;
};
 
void minf_parse(struct minf_t* minf, unsigned char* buffer, unsigned int size)
{
  struct atom_t leaf_atom;
  unsigned char* buffer_start = buffer;
 
  minf->start_ = buffer;
 
  while(buffer < buffer_start + size)
  {
    buffer = atom_read_header(buffer, &leaf_atom);
 
    atom_print(&leaf_atom);
 
    if(atom_is(&leaf_atom, "stbl"))
    {
      stbl_parse(&minf->stbl_, buffer, leaf_atom.size_ - ATOM_PREAMBLE_SIZE);
    }
 
    buffer = atom_skip(buffer, &leaf_atom);
  }
}
 
struct mdia_t
{
  unsigned char* start_;
  unsigned char* mdhd_;
  struct minf_t minf_;
//  hdlr hdlr_;
};
 
void mdia_parse(struct mdia_t* mdia, unsigned char* buffer, unsigned int size)
{
  struct atom_t leaf_atom;
  unsigned char* buffer_start = buffer;
 
  mdia->start_ = buffer;
 
  while(buffer < buffer_start + size)
  {
    buffer = atom_read_header(buffer, &leaf_atom);
 
    atom_print(&leaf_atom);
 
    if(atom_is(&leaf_atom, "mdhd"))
    {
      mdia->mdhd_ = buffer;
    }
    else
    if(atom_is(&leaf_atom, "minf"))
    {
      minf_parse(&mdia->minf_, buffer, leaf_atom.size_ - ATOM_PREAMBLE_SIZE);
    }
 
    buffer = atom_skip(buffer, &leaf_atom);
  }
}
 
struct chunks_t
{
  unsigned int sample_;   // number of the first sample in the chunk
  unsigned int size_;     // number of samples in the chunk
  int id_;                // for multiple codecs mode - not used
  uint64_t pos_;          // start byte position of chunk
};
 
struct samples_t
{
  unsigned int pts_;      // decoding/presentation time
  unsigned int size_;     // size in bytes
  uint64_t pos_;          // byte offset
  unsigned int cto_;      // composition time offset
};
 
struct trak_t
{
  unsigned char* start_;
  unsigned char* tkhd_;
  struct mdia_t mdia_;
 
  /* temporary indices */
  unsigned int chunks_size_;
  struct chunks_t* chunks_;
 
  unsigned int samples_size_;
  struct samples_t* samples_;
};
 
void trak_init(struct trak_t* trak)
{
  trak->chunks_ = 0;
  trak->samples_ = 0;
}
 
void trak_exit(struct trak_t* trak)
{
  if(trak->chunks_)
      free(trak->chunks_);
  if(trak->samples_)
    free(trak->samples_);
}
 
void trak_parse(struct trak_t* trak, unsigned char* buffer, unsigned int size)
{
  struct atom_t leaf_atom;
  unsigned char* buffer_start = buffer;
 
  trak->start_ = buffer;
 
  while(buffer < buffer_start + size)
  {
    buffer = atom_read_header(buffer, &leaf_atom);
 
    atom_print(&leaf_atom);
 
    if(atom_is(&leaf_atom, "tkhd"))
    {
      trak->tkhd_ = buffer;
    }
    else
    if(atom_is(&leaf_atom, "mdia"))
    {
      mdia_parse(&trak->mdia_, buffer, leaf_atom.size_ - ATOM_PREAMBLE_SIZE);
    }
 
    buffer = atom_skip(buffer, &leaf_atom);
  }
}
 
struct moov_t
{
  unsigned char* start_;
  unsigned int tracks_;
  unsigned char* mvhd_;
  struct trak_t traks_[MAX_TRACKS];
};
 
void moov_init(struct moov_t* moov)
{
  moov->tracks_ = 0;
}
 
void moov_exit(struct moov_t* moov)
{
  unsigned int i;
  for(i = 0; i != moov->tracks_; ++i)
  {
    trak_exit(&moov->traks_[i]);
  }
}
 
void trak_build_index(struct trak_t* trak)
{
  void const* stco = trak->mdia_.minf_.stbl_.stco_;
 
  trak->chunks_size_ = stco_get_entries(stco);
  trak->chunks_ = malloc(trak->chunks_size_ * sizeof(struct chunks_t));
 
  {
    unsigned int i;
    for(i = 0; i != trak->chunks_size_; ++i)
    {
      trak->chunks_[i].pos_ = stco_get_offset(stco, i);
    }
  }
 
  // process chunkmap:
  {
    void const* stsc = trak->mdia_.minf_.stbl_.stsc_;
    unsigned int last = trak->chunks_size_;
    unsigned int i = stsc_get_entries(stsc);
    while(i > 0)
    {
      struct stsc_table_t stsc_table;
      unsigned int j;
 
      --i;
 
      stsc_get_table(stsc, i, &stsc_table);
      for(j = stsc_table.chunk_; j < last; j++)
      {
        trak->chunks_[j].id_ = stsc_table.id_;
        trak->chunks_[j].size_ = stsc_table.samples_;
      }
      last = stsc_table.chunk_;
    }
  }
 
  // calc pts of chunks:
  {
    void const* stsz = trak->mdia_.minf_.stbl_.stsz_;
    unsigned int sample_size = stsz_get_sample_size(stsz);
    unsigned int s = 0;
    {
      unsigned int j;
      for(j = 0; j < trak->chunks_size_; j++)
      {
        trak->chunks_[j].sample_ = s;
        s += trak->chunks_[j].size_;
      }
    }
 
    if(sample_size == 0)
    {
      trak->samples_size_ = stsz_get_entries(stsz);
    }
    else
    {
      trak->samples_size_ = s;
    }
 
    trak->samples_ = malloc(trak->samples_size_ * sizeof(struct samples_t));
 
    if(sample_size == 0)
    {
      unsigned int i;
      for(i = 0; i != trak->samples_size_ ; ++i)
        trak->samples_[i].size_ = stsz_get_size(stsz, i);
    }
    else
    {
      unsigned int i;
      for(i = 0; i != trak->samples_size_ ; ++i)
        trak->samples_[i].size_ = sample_size;
    }
  }
 
//  i = 0;
//  for (j = 0; j < trak->durmap_size; j++)
//    i += trak->durmap[j].num;
//  if (i != s) {
//    mp_msg(MSGT_DEMUX, MSGL_WARN,
//           "MOV: durmap and chunkmap sample count differ (%i vs %i)\n", i, s);
//    if (i > s) s = i;
//  }
 
  // calc pts:
  {
    void const* stts = trak->mdia_.minf_.stbl_.stts_;
    unsigned int s = 0;
    unsigned int pts = 0;
    unsigned int entries = stts_get_entries(stts);
    unsigned int j;
    for(j = 0; j < entries; j++)
    {
      unsigned int i;
      unsigned int sample_count;
      unsigned int sample_duration;
      stts_get_sample_count_and_duration(stts, j,
                                         &sample_count, &sample_duration);
      for(i = 0; i < sample_count; i++)
      {
        trak->samples_[s].pts_ = pts;
        ++s;
        pts += sample_duration;
      }
    }
  }
 
  // calc composition times:
  {
    void const* ctts = trak->mdia_.minf_.stbl_.ctts_;
    if(ctts)
    {
      unsigned int s = 0;
      unsigned int entries = ctts_get_entries(ctts);
      unsigned int j;
      for(j = 0; j < entries; j++)
      {
        unsigned int i;
        unsigned int sample_count;
        unsigned int sample_offset;
        ctts_get_sample_count_and_offset(ctts, j, &sample_count, &sample_offset);
        for(i = 0; i < sample_count; i++)
        {
          trak->samples_[s].cto_ = sample_offset;
          ++s;
        }
      }
    }
  }
 
  // calc sample offsets
  {
    unsigned int s = 0;
    unsigned int j;
    for(j = 0; j != trak->chunks_size_; j++)
    {
      uint64_t pos = trak->chunks_[j].pos_;
      unsigned int i;
      for(i = 0; i != trak->chunks_[j].size_; i++)
      {
        trak->samples_[s].pos_ = pos;
        pos += trak->samples_[s].size_;
        ++s;
      }
    }
  }
}
 
void trak_write_index(struct trak_t* trak, unsigned int start, unsigned int end)
{
  // write samples [start,end>
 
  // stts = [entries * [sample_count, sample_duration]
  {
    unsigned char* stts = trak->mdia_.minf_.stbl_.stts_;
    unsigned int entries = 0;
    struct stts_table_t* table = (struct stts_table_t*)(stts + 8);
    unsigned int s;
    for(s = start; s != end; ++s)
    {
      unsigned int sample_count = 1;
      unsigned int sample_duration =
        trak->samples_[s + 1].pts_ - trak->samples_[s].pts_;
      while(s != end - 1)
      {
        if((trak->samples_[s + 1].pts_ - trak->samples_[s].pts_) != sample_duration)
          break;
        ++sample_count;
        ++s;
      }
      // write entry
      write_int32(&table[entries].sample_count_, sample_count);
      write_int32(&table[entries].sample_duration_, sample_duration);
      ++entries;
    }
    write_int32(stts + 4, entries);
    if(stts_get_samples(stts) != end - start)
    {
      printf("ERROR: stts_get_samples=%d, should be %d\n",
             stts_get_samples(stts), end - start);
    }
  }
 
  // ctts = [entries * [sample_count, sample_offset]
  {
    unsigned char* ctts = trak->mdia_.minf_.stbl_.ctts_;
    if(ctts)
    {
      unsigned int entries = 0;
      struct ctts_table_t* table = (struct ctts_table_t*)(ctts + 8);
      unsigned int s;
      for(s = start; s != end; ++s)
      {
        unsigned int sample_count = 1;
        unsigned int sample_offset = trak->samples_[s].cto_;
        while(s != end - 1)
        {
          if(trak->samples_[s + 1].cto_ != sample_offset)
            break;
          ++sample_count;
          ++s;
        }
        // write entry
        write_int32(&table[entries].sample_count_, sample_count);
        write_int32(&table[entries].sample_offset_, sample_offset);
        ++entries;
      }
      write_int32(ctts + 4, entries);
      if(ctts_get_samples(ctts) != end - start)
      {
        printf("ERROR: ctts_get_samples=%d, should be %d\n",
               ctts_get_samples(ctts), end - start);
      }
    }
  }
 
  // process chunkmap:
  {
    unsigned char* stsc = trak->mdia_.minf_.stbl_.stsc_;
    struct stsc_table_t* stsc_table = (struct stsc_table_t*)(stsc + 8);
    unsigned int i;
    for(i = 0; i != trak->chunks_size_; ++i)
    {
      if(trak->chunks_[i].sample_ + trak->chunks_[i].size_ > start)
        break;
    }
 
    {
      unsigned int stsc_entries = 0;
      unsigned int chunk_start = i;
      unsigned int chunk_end;
      unsigned int samples =
        trak->chunks_[i].sample_ + trak->chunks_[i].size_ - start;
      unsigned int id = trak->chunks_[i].id_;
 
      // write entry [chunk,samples,id]
      write_int32(&stsc_table[stsc_entries].chunk_, 1);
      write_int32(&stsc_table[stsc_entries].samples_, samples);
      write_int32(&stsc_table[stsc_entries].id_, id);
      ++stsc_entries;
      if(i != trak->chunks_size_)
      {
        for(i += 1; i != trak->chunks_size_; ++i)
        {
          if(trak->chunks_[i].sample_ >= end)
            break;
 
          if(trak->chunks_[i].size_ != samples)
          {
            samples = trak->chunks_[i].size_;
            id = trak->chunks_[i].id_;
            write_int32(&stsc_table[stsc_entries].chunk_, i - chunk_start + 1);
            write_int32(&stsc_table[stsc_entries].samples_, samples);
            write_int32(&stsc_table[stsc_entries].id_, id);
            ++stsc_entries;
          }
        }
      }
      chunk_end = i;
      write_int32(stsc + 4, stsc_entries);
      {
        unsigned char* stco = trak->mdia_.minf_.stbl_.stco_;
//        stco_erase(stco, chunk_start);
//        unsigned int entries = read_int32(stco + 4);
        unsigned int entries = chunk_end;
        uint32_t* stco_table = (uint32_t*)(stco + 8);
        memmove(stco_table, &stco_table[chunk_start],
                (entries - chunk_start) * sizeof(uint32_t));
 
memset(&stco_table[entries - chunk_start], 0,
       (read_int32(stco + 4) - (entries - chunk_start)) * sizeof(uint32_t));
 
        write_int32(stco + 4, entries - chunk_start);
 
        // patch first chunk with correct sample offset
//        uint32_t* stco_table = (uint32_t*)(stco + 8);
        write_int32(stco_table, (uint32_t)trak->samples_[start].pos_);
      }
    }
  }
 
  // process sync samples:
  if(trak->mdia_.minf_.stbl_.stss_)
  {
    unsigned char* stss = trak->mdia_.minf_.stbl_.stss_;
    unsigned int entries = read_int32(stss + 4);
    uint32_t* table = (uint32_t*)(stss + 8);
    unsigned int stss_start;
    unsigned int i;
    for(i = 0; i != entries; ++i)
    {
      if(read_int32(&table[i]) >= start + 1)
        break;
    }
    stss_start = i;
    for(; i != entries; ++i)
    {
      unsigned int sync_sample = read_int32(&table[i]);
      if(sync_sample >= end + 1)
        break;
      write_int32(&table[i - stss_start], sync_sample - start);
 
    }
//    memmove(table, table + stss_start, (i - stss_start) * sizeof(uint32_t));
    write_int32(stss + 4, i - stss_start);
  }
 
  // process sample sizes
  {
    unsigned char* stsz = trak->mdia_.minf_.stbl_.stsz_;
    if(stsz_get_sample_size(stsz) == 0)
    {
      uint32_t* table = (uint32_t*)(stsz + 12);
      memmove(table, &table[start], (end - start) * sizeof(uint32_t));
memset(&table[end - start], 0,
       (read_int32(stsz + 8) - (end - start)) * sizeof(uint32_t));
      write_int32(stsz + 8, end - start);
    }
  }
}
 
int moov_parse(struct moov_t* moov, unsigned char* buffer, uint64_t size)
{
  struct atom_t leaf_atom;
  unsigned char* buffer_start = buffer;
 
  moov->start_ = buffer;
 
  while(buffer < buffer_start + size)
  {
    buffer = atom_read_header(buffer, &leaf_atom);
 
    atom_print(&leaf_atom);
 
    if(atom_is(&leaf_atom, "cmov"))
    {
      return 0;
    }
    else
    if(atom_is(&leaf_atom, "mvhd"))
    {
      moov->mvhd_ = buffer;
    }
    else
    if(atom_is(&leaf_atom, "trak"))
    {
      if(moov->tracks_ == MAX_TRACKS)
        return 0;
      else
      {
        struct trak_t* trak = &moov->traks_[moov->tracks_];
        trak_init(trak);
        trak_parse(trak, buffer, leaf_atom.size_ - ATOM_PREAMBLE_SIZE);
        ++moov->tracks_;
      }
    }
    buffer = atom_skip(buffer, &leaf_atom);
  }
 
  // build the indexing tables
  {
    unsigned int i;
    for(i = 0; i != moov->tracks_; ++i)
    {
      trak_build_index(&moov->traks_[i]);
    }
  }
 
  return 1;
}
 
void stco_shift_offsets(unsigned char* stco, int offset)
{
  unsigned int entries = read_int32(stco + 4);
  unsigned int* table = (unsigned int*)(stco + 8);
  unsigned int i;
  for(i = 0; i != entries; ++i)
    write_int32(&table[i], (read_int32(&table[i]) + offset));
}
 
void trak_shift_offsets(struct trak_t* trak, int64_t offset)
{
  unsigned char* stco = trak->mdia_.minf_.stbl_.stco_;
  stco_shift_offsets(stco, (int32_t)offset);
}
 
void moov_shift_offsets(struct moov_t* moov, int64_t offset)
{
  unsigned int i;
  for(i = 0; i != moov->tracks_; ++i)
  {
    trak_shift_offsets(&moov->traks_[i], offset);
  }
}
 
long mvhd_get_time_scale(unsigned char* mvhd)
{
  int version = read_char(mvhd);
  unsigned char* p = mvhd + (version == 0 ? 12 : 20);
  return read_int32(p);
}
 
void mvhd_set_duration(unsigned char* mvhd, uint64_t duration)
{
  int version = read_char(mvhd);
  if(version == 0)
  {
    write_int32(mvhd + 16, (uint32_t)duration);
  }
  else
  {
    write_int64(mvhd + 24, duration);
  }
}
 
long mdhd_get_time_scale(unsigned char* mdhd)
{
  int version = read_char(mdhd);
  unsigned char* p = mdhd + (version == 0 ? 12 : 20);
 
  return read_int32(p);
}
 
void mdhd_set_duration(unsigned char* mdhd, uint64_t duration)
{
  int version = read_char(mdhd);
  if(version == 0)
  {
    write_int32(mdhd + 16, (uint32_t)duration);
  }
  else
  {
    write_int64(mdhd + 24, duration);
  }
}
 
void tkhd_set_duration(unsigned char* tkhd, uint64_t duration)
{
  int version = read_char(tkhd);
  if(version == 0)
  {
    write_int32(tkhd + 20, (uint32_t)duration);
  }
  else
  {
    write_int64(tkhd + 28, duration);
  }
}
 
unsigned int stss_get_entries(unsigned char const* stss)
{
  return read_int32(stss + 4);
}
 
long stss_get_sample(unsigned char const* stss, unsigned int idx)
{
  unsigned char const* p = stss + 8 + idx * 4;
  return read_int32(p);
}
 
unsigned int stss_get_nearest_keyframe(unsigned char const* stss, unsigned int sample)
{
  // scan the sync samples to find the key frame that precedes the sample number
  unsigned int i;
  unsigned int entries = stss_get_entries(stss);
  unsigned int table_sample = 0;
  for(i = 0; i != entries; ++i)
  {
    table_sample = stss_get_sample(stss, i);
    if(table_sample >= sample)
      break;
  }
  if(table_sample == sample)
    return table_sample;
  else
    return stss_get_sample(stss, i - 1);
}
 
unsigned int stbl_get_nearest_keyframe(struct stbl_t const* stbl, unsigned int sample)
{
  // If the sync atom is not present, all samples are implicit sync samples.
  if(!stbl->stss_)
    return sample;
 
  return stss_get_nearest_keyframe(stbl->stss_, sample);
}
 
unsigned int moov_seek(unsigned char* moov_data,
                       uint64_t* moov_size,
                       float start_time,
                       float end_time,
                       uint64_t* mdat_start,
                       uint64_t* mdat_size,
                       uint64_t offset)
{
  struct moov_t* moov = malloc(sizeof(struct moov_t));
  moov_init(moov);
  if(!moov_parse(moov, moov_data + ATOM_PREAMBLE_SIZE, *moov_size - ATOM_PREAMBLE_SIZE))
  {
    moov_exit(moov);
    free(moov);
    return 0;
  }
 
  {
    long moov_time_scale = mvhd_get_time_scale(moov->mvhd_);
    unsigned int start = (unsigned int)(start_time * moov_time_scale);
    unsigned int end = (unsigned int)(end_time * moov_time_scale);
    uint64_t skip_from_start = UINT64_MAX;
    uint64_t end_offset = 0;
    unsigned int i;
 
    // for every trak, convert seconds to sample (time-to-sample).
    // adjust sample to keyframe
    unsigned int trak_sample_start[MAX_TRACKS];
    unsigned int trak_sample_end[MAX_TRACKS];
 
    uint64_t moov_duration = 0;
 
    // clayton.mp4 has a third track with one sample that lasts the whole clip.
    // Assuming the first two tracks are the audio and video track, we patch
    // the remaining tracks to 'free' atoms.
    if(moov->tracks_ > 2)
    {
      for(i = 2; i != moov->tracks_; ++i)
      {
        // patch 'trak' to 'free'
        unsigned char* p = moov->traks_[i].start_ - 4;
        p[0] = 'f';
        p[1] = 'r';
        p[2] = 'e';
        p[3] = 'e';
      }
      moov->tracks_ = 2;
    }
 
    for(i = 0; i != moov->tracks_; ++i)
    {
      struct trak_t* trak = &moov->traks_[i];
      struct stbl_t* stbl = &trak->mdia_.minf_.stbl_;
      long trak_time_scale = mdhd_get_time_scale(trak->mdia_.mdhd_);
      float moov_to_trak_time = (float)trak_time_scale / (float)moov_time_scale;
      float trak_to_moov_time = (float)moov_time_scale / (float)trak_time_scale;
 
      // DEBUG
#if 0
      {
        uint64_t trak_duration = stts_get_duration(stbl->stts_);
      }
#endif
 
      // get start
      if(start == 0)
      {
        trak_sample_start[i] = start;
      }
      else
      {
        start = stts_get_sample(stbl->stts_, (unsigned int)(start * moov_to_trak_time));
        start = stbl_get_nearest_keyframe(stbl, start + 1) - 1;
        trak_sample_start[i] = start;
        start = (unsigned int)(stts_get_time(stbl->stts_, start) * trak_to_moov_time);
      }
 
      // get end
      if(end == 0)
      {
        trak_sample_end[i] = trak->samples_size_;
      }
      else
      {
        end = stts_get_sample(stbl->stts_, (unsigned int)(end * moov_to_trak_time));
        if(end >= trak->samples_size_)
        {
          end = trak->samples_size_;
        }
        else
        {
          end = stbl_get_nearest_keyframe(stbl, end + 1) - 1;
        }
        trak_sample_end[i] = end;
        printf("endframe=%u, samples_size_=%u\n", end, trak->samples_size_);
        end = (unsigned int)(stts_get_time(stbl->stts_, end) * trak_to_moov_time);
      }
    }
 
    printf("start=%u\n", start);
    printf("end=%u\n", end);
 
    if(end && start >= end)
      return 0;
 
    for(i = 0; i != moov->tracks_; ++i)
    {
      struct trak_t* trak = &moov->traks_[i];
      struct stbl_t* stbl = &trak->mdia_.minf_.stbl_;
 
      unsigned int start_sample = trak_sample_start[i];
      unsigned int end_sample = trak_sample_end[i];
 
      trak_write_index(trak, start_sample, end_sample);
 
      {
        uint64_t skip =
          trak->samples_[start_sample].pos_ - trak->samples_[0].pos_;
        if(skip < skip_from_start)
          skip_from_start = skip;
        printf("Trak can skip %llu bytes\n", skip);
 
        if(end_sample != trak->samples_size_)
        {
          uint64_t end_pos = trak->samples_[end_sample].pos_;
          if(end_pos > end_offset)
            end_offset = end_pos;
          printf("New endpos=%llu\n", end_pos);
          printf("Trak can skip %llu bytes at end\n",
                 *mdat_start + *mdat_size - end_offset);
        }
      }
 
      {
        // fixup trak (duration)
        uint64_t trak_duration = stts_get_duration(stbl->stts_);
        long trak_time_scale = mdhd_get_time_scale(trak->mdia_.mdhd_);
        float trak_to_moov_time = (float)moov_time_scale / (float)trak_time_scale;
        uint64_t duration = (long)((float)trak_duration * trak_to_moov_time);
        mdhd_set_duration(trak->mdia_.mdhd_, trak_duration);
        tkhd_set_duration(trak->tkhd_, duration);
        printf("trak: new_duration=%lld\n", duration);
 
        if(duration > moov_duration)
          moov_duration = duration;
      }
 
      printf("stco.size=%d, ", read_int32(stbl->stco_ + 4));
      printf("stts.size=%d samples=%d\n", read_int32(stbl->stts_ + 4), stts_get_samples(stbl->stts_));
      printf("stsz.size=%d\n", read_int32(stbl->stsz_ + 8));
      printf("stsc.samples=%d\n", stsc_get_samples(stbl->stsc_));
    }
    mvhd_set_duration(moov->mvhd_, moov_duration);
 
    offset -= skip_from_start;
 
    printf("shifting offsets by %lld\n", offset);
    moov_shift_offsets(moov, offset);
 
#ifdef COMPRESS_MOOV_ATOM
    {
      uLong sourceLen = *moov_size - ATOM_PREAMBLE_SIZE;
      uLong destLen = compressBound(sourceLen);
      unsigned char* cmov = malloc(destLen);
      int zstatus = compress(cmov, &destLen, moov_data, sourceLen);
      if(zstatus == Z_OK)
      {
        printf("cmov size = %lu (%ld%%)\n", destLen, 100 * destLen / sourceLen);
      }
 
      {
        const int extra_space = 4096;
        if(destLen + extra_space < sourceLen)
        {
          const int bytes_saved = sourceLen - destLen;
          uLong destLen2;
          int extra = 0;
          printf("shifting offsets by %d\n", -bytes_saved);
          moov_shift_offsets(moov, -bytes_saved);
 
          extra += ATOM_PREAMBLE_SIZE + 4;            // dcom
          extra += ATOM_PREAMBLE_SIZE + 4;            // cmvd
          extra += ATOM_PREAMBLE_SIZE;                // cmov
          extra += ATOM_PREAMBLE_SIZE + extra_space;  // free
 
          printf("shifting offsets by %d\n", extra);
          moov_shift_offsets(moov, extra);
 
          // recompress
          destLen2 = compressBound(sourceLen);
          zstatus = compress(cmov, &destLen2, moov_data, sourceLen);
          if(zstatus == Z_OK)
          {
            printf("cmov size = %lu (%ld%%)\n", destLen2, 100 * destLen2 / sourceLen);
 
            if(destLen2 < destLen + extra_space)
            {
              // copy compressed movie atom
              unsigned char* outbuffer = moov_data;
 
              uint32_t dcom_size = ATOM_PREAMBLE_SIZE + 4;
              uint32_t cmvd_size = ATOM_PREAMBLE_SIZE + 4 + destLen2;
              uint32_t cmov_size = ATOM_PREAMBLE_SIZE + dcom_size + cmvd_size;
              uint32_t free_size = ATOM_PREAMBLE_SIZE + extra_space + destLen - destLen2;
              *moov_size = ATOM_PREAMBLE_SIZE + cmov_size + free_size;
 
              write_int32(outbuffer, (uint32_t)*moov_size);
              outbuffer += 4;
 
              // skip 'moov'
              outbuffer += 4;
 
              write_int32(outbuffer, cmov_size);
              outbuffer += 4;
              {
                outbuffer[0] = 'c';
                outbuffer[1] = 'm';
                outbuffer[2] = 'o';
                outbuffer[3] = 'v';
                outbuffer += 4;
 
                write_int32(outbuffer, dcom_size);
                outbuffer += 4;
                {
                  outbuffer[0] = 'd';
                  outbuffer[1] = 'c';
                  outbuffer[2] = 'o';
                  outbuffer[3] = 'm';
                  outbuffer += 4;
 
                  outbuffer[0] = 'z';
                  outbuffer[1] = 'l';
                  outbuffer[2] = 'i';
                  outbuffer[3] = 'b';
                  outbuffer += 4;
                }
 
                write_int32(outbuffer, cmvd_size);
                outbuffer += 4;
                {
                  outbuffer[0] = 'c';
                  outbuffer[1] = 'm';
                  outbuffer[2] = 'v';
                  outbuffer[3] = 'd';
                  outbuffer += 4;
 
                  write_int32(outbuffer, sourceLen);
                  outbuffer += 4;
 
                  memcpy(outbuffer, cmov, destLen2);
                  outbuffer += destLen2;
                }
              }
 
              // add final padding
              write_int32(outbuffer, free_size);
              outbuffer += 4;
 
              outbuffer[0] = 'f';
              outbuffer[1] = 'r';
              outbuffer[2] = 'e';
              outbuffer[3] = 'e';
              outbuffer += 4;
 
              {
                const char free_bytes[8] =
                {
                  'C', 'o', 'd', 'e','S','h', 'o', 'p'
                };
                uint32_t padding_index;
                for(padding_index = ATOM_PREAMBLE_SIZE; padding_index != free_size; ++padding_index)
                {
                  outbuffer[padding_index] = free_bytes[padding_index % 8];
                }
              }
            }
            else
            {
              printf("2nd pass compress overflow\n");
            }
          }
        }
      }
      free(cmov);
    }
#endif
 
    *mdat_start += skip_from_start;
    if(end_offset != 0)
    {
      *mdat_size = end_offset;
    }
    *mdat_size -= skip_from_start;
  }
 
  moov_exit(moov);
  free(moov);
 
  return 1;
}

Merci pour votre aide...