* all: added a nuv demuxer (limited to mpeg4 video and mp3 audio).
authorLaurent Aimar <fenrir@videolan.org>
Wed, 23 Mar 2005 17:00:15 +0000 (17:00 +0000)
committerLaurent Aimar <fenrir@videolan.org>
Wed, 23 Mar 2005 17:00:15 +0000 (17:00 +0000)
 (Seek is slow, I don't support index yet).

configure.ac
modules/demux/Modules.am
modules/demux/nuv.c [new file with mode: 0644]

index 2780bd4..c311fed 100644 (file)
@@ -976,7 +976,7 @@ VLC_ADD_PLUGINS([trivial_resampler ugly_resampler])
 VLC_ADD_PLUGINS([trivial_channel_mixer trivial_mixer])
 VLC_ADD_PLUGINS([id3 playlist export sgimb m3u xtag])
 VLC_ADD_PLUGINS([i420_rgb rawvideo blend scale image logo])
-VLC_ADD_PLUGINS([wav araw subtitle vobsub adpcm a52sys dtssys au ty voc xa])
+VLC_ADD_PLUGINS([wav araw subtitle vobsub adpcm a52sys dtssys au ty voc xa nuv])
 VLC_ADD_PLUGINS([access_directory access_file access_udp access_tcp])
 VLC_ADD_PLUGINS([access_http access_mms access_ftp ipv4])
 VLC_ADD_PLUGINS([packetizer_mpegvideo packetizer_h264])
index 185bfc3..71787de 100644 (file)
@@ -24,3 +24,4 @@ SOURCES_ty = ty.c
 SOURCES_vobsub = vobsub.c
 SOURCES_voc = voc.c
 SOURCES_xa = xa.c
+SOURCES_nuv = nuv.c
diff --git a/modules/demux/nuv.c b/modules/demux/nuv.c
new file mode 100644 (file)
index 0000000..fbece3d
--- /dev/null
@@ -0,0 +1,779 @@
+/*****************************************************************************
+ * nuv.c:
+ *****************************************************************************
+ * Copyright (C) 2005 VideoLAN
+ * $Id: $
+ *
+ * Authors: Laurent Aimar <fenrir@via.ecp.fr>
+ *
+ * This program 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.
+ *
+ * This program 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, USA.
+ *****************************************************************************/
+
+/*****************************************************************************
+ * Preamble
+ *****************************************************************************/
+#include <vlc/vlc.h>
+#include <vlc/input.h>
+
+/* TODO:
+ *  - complete support (add support for rtjpeg and raw)
+ *  - better seek support (to key frame)
+ *  - control GET_LENGTH (harder, unless we have an extended header+index)
+ *  - test
+ */
+
+/*****************************************************************************
+ * Module descriptor
+ *****************************************************************************/
+static int  Open  ( vlc_object_t * );
+static void Close ( vlc_object_t * );
+
+vlc_module_begin();
+    set_category( CAT_INPUT );
+    set_subcategory( SUBCAT_INPUT_DEMUX );
+    set_description( _("Nuv demuxer") );
+    set_capability( "demux2", 145 );
+    set_callbacks( Open, Close );
+    add_shortcut( "nuv" );
+vlc_module_end();
+
+/*****************************************************************************
+ * Local prototypes
+ *****************************************************************************/
+static int Demux  ( demux_t * );
+static int Control( demux_t *, int, va_list );
+
+/* */
+typedef struct
+{
+    int64_t i_time;
+    int64_t i_offset;
+
+} demux_index_entry_t;
+
+typedef struct
+{
+    int i_idx;
+    int i_idx_max;
+
+    demux_index_entry_t *idx;
+} demux_index_t;
+
+
+static void demux_IndexInit( demux_index_t * );
+static void demux_IndexClean( demux_index_t * );
+static void demux_IndexAppend( demux_index_t *,
+                               int64_t i_time, int64_t i_offset );
+/* Convert a time into offset */
+static int64_t demux_IndexConvertTime( demux_index_t *, int64_t i_time );
+/* Find the nearest offset in the index */
+static int64_t demux_IndexFindOffset( demux_index_t *, int64_t i_offset );
+
+
+/* */
+typedef struct
+{
+    char id[12];       /* "NuppelVideo\0" or "MythTVVideo\0" */
+    char version[5];    /* "x.xx\0" */
+
+    int  i_width;
+    int  i_height;
+    int  i_width_desired;
+    int  i_height_desired;
+
+    char i_mode;            /* P progressive, I interlaced */
+
+    double  d_aspect;       /* 1.0 squared pixel */
+    double  d_fps;
+
+    int     i_video_blocks; /* 0 no video, -1 unknown */
+    int     i_audio_blocks;
+    int     i_text_blocks;
+
+    int     i_keyframe_distance;
+
+} header_t;
+
+typedef struct
+{
+    char i_type;        /* A: audio, V: video, S: sync; T: test
+                           R: Seekpoint (string:RTjjjjjjjj)
+                           D: Extra data for codec */
+    char i_compression; /* V: 0 uncompressed
+                              1 RTJpeg
+                              2 RTJpeg+lzo
+                              N black frame
+                              L copy last
+                           A: 0 uncompressed (44100 1-bits, 2ch)
+                              1 lzo
+                              2 layer 2
+                              3 layer 3
+                              F flac
+                              S shorten
+                              N null frame loudless
+                              L copy last
+                            S: B audio and vdeo sync point
+                               A audio sync info (timecode == effective
+                                    dsp frequency*100)
+                               V next video sync (timecode == next video
+                                    frame num)
+                               S audio,video,text correlation */
+    char i_keyframe;    /* 0 keyframe, else no no key frame */
+    uint8_t i_filters;  /* 0x01: gauss 5 pixel (8,2,2,2,2)/16
+                           0x02: gauss 5 pixel (8,1,1,1,1)/12
+                           0x04: cartoon filter */
+
+    int i_timecode;     /* ms */
+
+    int i_length;       /* V,A,T: length of following data
+                           S: length of packet correl */
+} frame_header_t;
+
+/* FIXME Not sure of this one */
+typedef struct
+{
+    int             i_version;
+    vlc_fourcc_t    i_video_fcc;
+
+    vlc_fourcc_t    i_audio_fcc;
+    int             i_audio_sample_rate;
+    int             i_audio_bits_per_sample;
+    int             i_audio_channels;
+    int             i_audio_compression_ratio;
+    int             i_audio_quality;
+    int             i_rtjpeg_quality;
+    int             i_rtjpeg_luma_filter;
+    int             i_rtjpeg_chroma_filter;
+    int             i_lavc_bitrate;
+    int             i_lavc_qmin;
+    int             i_lavc_qmax;
+    int             i_lavc_maxqdiff;
+    int64_t         i_seekable_offset;
+    int64_t         i_keyframe_adjust_offset;
+
+} extended_header_t;
+
+struct demux_sys_t
+{
+    header_t          hdr;
+    extended_header_t exh;
+
+    int64_t     i_pcr;
+    es_out_id_t *p_es_video;
+    int         i_extra_f;
+    uint8_t     *p_extra_f;
+
+    es_out_id_t *p_es_audio;
+
+    /* index */
+    demux_index_t idx;
+};
+
+static int HeaderLoad( demux_t *, header_t *h );
+static int FrameHeaderLoad( demux_t *, frame_header_t *h );
+static int ExtendedHeaderLoad( demux_t *, extended_header_t *h );
+
+/*****************************************************************************
+ * Open: initializes ES structures
+ *****************************************************************************/
+static int Open( vlc_object_t * p_this )
+{
+    demux_t     *p_demux = (demux_t*)p_this;
+    demux_sys_t *p_sys;
+    uint8_t     *p_peek;
+    frame_header_t fh;
+    vlc_bool_t  b_extended;
+
+    /* Check id */
+    if( stream_Peek( p_demux->s, &p_peek, 12 ) != 12 ||
+        ( strncmp( p_peek, "MythTVVideo", 11 ) &&
+          strncmp( p_peek, "NuppelVideo", 11 ) ) )
+        return VLC_EGENERIC;
+
+    p_sys = malloc( sizeof( demux_sys_t ) );
+    memset( p_sys, 0, sizeof( demux_sys_t ) );
+    p_sys->p_es_video = NULL;
+    p_sys->p_es_audio = NULL;
+    p_sys->p_extra_f = NULL;
+    p_sys->i_pcr = -1;
+    demux_IndexInit( &p_sys->idx );
+
+    if( HeaderLoad( p_demux, &p_sys->hdr ) )
+        goto error;
+
+    /* Load 'D' */
+    if( FrameHeaderLoad( p_demux, &fh ) || fh.i_type != 'D' )
+        goto error;
+    if( fh.i_length > 0 )
+    {
+        if( fh.i_compression == 'F' )
+        {
+            /* ffmpeg extra data */
+            p_sys->i_extra_f = fh.i_length;
+            p_sys->p_extra_f = malloc( fh.i_length );
+            if( stream_Read( p_demux->s,
+                             p_sys->p_extra_f, fh.i_length ) != fh.i_length )
+                goto error;
+        }
+        else
+        {
+            /* TODO handle rtjpeg */
+            msg_Warn( p_demux, "unsuported 'D' frame (c=%c)", fh.i_compression );
+            if( stream_Read( p_demux->s, NULL, fh.i_length ) != fh.i_length )
+                goto error;
+        }
+    }
+
+    /* Check and load extented */
+    if( stream_Peek( p_demux->s, &p_peek, 1 ) != 1 )
+        goto error;
+    if( p_peek[0] == 'X' )
+    {
+        b_extended = VLC_TRUE;
+
+        if( FrameHeaderLoad( p_demux, &fh ) )
+            goto error;
+        if( fh.i_length != 512 )
+            goto error;
+
+        if( ExtendedHeaderLoad( p_demux, &p_sys->exh ) )
+            goto error;
+
+    }
+    else
+    {
+        b_extended = VLC_FALSE;
+
+        /* XXX: for now only file with extended chunk are supported
+         * why: because else we need to have support for rtjpeg+stupid nuv shit */
+        msg_Err( p_demux, "incomplete NUV support (upload samples)" );
+        goto error;
+    }
+
+    /* Create audio/video (will work only with extended header and audio=mp3 */
+    if( p_sys->hdr.i_video_blocks != 0 )
+    {
+        es_format_t fmt;
+
+        es_format_Init( &fmt, VIDEO_ES, p_sys->exh.i_video_fcc );
+        fmt.video.i_width = p_sys->hdr.i_width;
+        fmt.video.i_height = p_sys->hdr.i_height;
+        fmt.i_extra = p_sys->i_extra_f;
+        fmt.p_extra = p_sys->p_extra_f;
+
+        p_sys->p_es_video = es_out_Add( p_demux->out, &fmt );
+    }
+    if( p_sys->hdr.i_audio_blocks != 0 )
+    {
+        es_format_t fmt;
+
+        es_format_Init( &fmt, AUDIO_ES, VLC_FOURCC('m','p','g','a') );
+        fmt.audio.i_rate = p_sys->exh.i_audio_sample_rate;
+        fmt.audio.i_bitspersample = p_sys->exh.i_audio_bits_per_sample;
+
+        p_sys->p_es_audio = es_out_Add( p_demux->out, &fmt );
+    }
+    if( p_sys->hdr.i_text_blocks != 0 )
+    {
+        msg_Warn( p_demux, "text not yet supported (upload samples)" );
+    }
+
+
+    /* Fill p_demux fields */
+    p_demux->pf_demux = Demux;
+    p_demux->pf_control = Control;
+    p_demux->p_sys = p_sys;
+
+    return VLC_SUCCESS;
+
+error:
+    msg_Warn( p_demux, "cannot load Nuv file" );
+    free( p_sys );
+    return VLC_EGENERIC;
+}
+
+/*****************************************************************************
+ * Close: frees unused data
+ *****************************************************************************/
+static void Close( vlc_object_t * p_this )
+{
+    demux_t        *p_demux = (demux_t*)p_this;
+    demux_sys_t    *p_sys = p_demux->p_sys;
+
+    if( p_sys->p_extra_f )
+        free( p_sys->p_extra_f );
+    demux_IndexClean( &p_sys->idx );
+    free( p_sys );
+}
+
+/*****************************************************************************
+ * Demux: reads and demuxes data packets
+ *****************************************************************************
+ * Returns -1 in case of error, 0 in case of EOF, 1 otherwise
+ *****************************************************************************/
+static int Demux( demux_t *p_demux )
+{
+    demux_sys_t *p_sys = p_demux->p_sys;
+    frame_header_t fh;
+    block_t *p_data;
+
+    for( ;; )
+    {
+        if( p_demux->b_die )
+            return -1;
+
+        if( FrameHeaderLoad( p_demux, &fh ) )
+            return 0;
+
+        if( fh.i_type == 'A' || fh.i_type == 'V' )
+            break;
+
+        /* TODO add support for some block type */
+
+        if( fh.i_type != 'R' )
+        {
+            stream_Read( p_demux->s, NULL, fh.i_length );
+        }
+    }
+
+    /* */
+    p_data = stream_Block( p_demux->s, fh.i_length );
+    p_data->i_dts = (int64_t)fh.i_timecode * 1000;
+    p_data->i_pts = (fh.i_type == 'V') ? 0 : p_data->i_dts;
+
+    /* */
+    demux_IndexAppend( &p_sys->idx, p_data->i_dts, stream_Tell(p_demux->s) );
+
+    /* */
+    if( p_data->i_dts > p_sys->i_pcr )
+    {
+        p_sys->i_pcr = p_data->i_dts;
+        es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_sys->i_pcr );
+    }
+
+    if( fh.i_type == 'A' && p_sys->p_es_audio )
+    {
+        if( fh.i_compression == '3' )
+            es_out_Send( p_demux->out, p_sys->p_es_audio, p_data );
+        else
+        {
+            msg_Dbg( p_demux, "unsupported compression %c for audio (upload samples)", fh.i_compression );
+            block_Release( p_data );
+        }
+    }
+    else if( fh.i_type == 'V' && p_sys->p_es_video )
+    {
+        if( fh.i_compression >= '4' )
+            es_out_Send( p_demux->out, p_sys->p_es_video, p_data );
+        else
+        {
+            msg_Dbg( p_demux, "unsupported compression %c for video (upload samples)", fh.i_compression );
+            block_Release( p_data );
+        }
+    }
+    else
+    {
+        block_Release( p_data );
+    }
+
+    return 1;
+}
+
+/*****************************************************************************
+ * Control:
+ *****************************************************************************/
+static int Control( demux_t *p_demux, int i_query, va_list args )
+{
+    demux_sys_t *p_sys  = p_demux->p_sys;
+
+    double   f, *pf;
+    int64_t i64, *pi64;
+
+    switch( i_query )
+    {
+
+        case DEMUX_GET_POSITION:
+            pf = (double*)va_arg( args, double * );
+            i64 = stream_Size( p_demux->s );
+            if( i64 > 0 )
+                *pf = (double)stream_Tell( p_demux->s ) / (double)i64;
+            else
+                *pf = 0.0;
+            return VLC_SUCCESS;
+
+        case DEMUX_SET_POSITION:
+        {
+            int64_t i_pos;
+
+            f = (double)va_arg( args, double );
+            i_pos = stream_Size( p_demux->s ) * f;
+
+            i64 = demux_IndexFindOffset( &p_sys->idx, i_pos );
+
+            p_sys->i_pcr = -1;
+
+            if( i64 >= 0 )
+                return stream_Seek( p_demux->s, i64 );
+
+            if( p_sys->idx.i_idx > 0 )
+            {
+                if( stream_Seek( p_demux->s, p_sys->idx.idx[p_sys->idx.i_idx-1].i_offset ) )
+                    return VLC_EGENERIC;
+            }
+            else
+            {
+                if( stream_Seek( p_demux->s, 0 ) )
+                    return VLC_EGENERIC;
+            }
+
+            while( !p_demux->b_die )
+            {
+                frame_header_t fh;
+                int64_t i_tell;
+
+                if( ( i_tell = stream_Tell( p_demux->s ) ) >= i_pos )
+                    break;
+
+                if( FrameHeaderLoad( p_demux, &fh ) )
+                    return VLC_EGENERIC;
+
+                if( fh.i_type == 'A' || fh.i_type == 'V' )
+                    demux_IndexAppend( &p_sys->idx,(int64_t)fh.i_timecode*1000, i_tell );
+
+                if( fh.i_type != 'R' )
+                    stream_Read( p_demux->s, NULL, fh.i_length );
+            }
+            return VLC_SUCCESS;
+        }
+
+
+        case DEMUX_GET_TIME:
+            pi64 = (int64_t*)va_arg( args, int64_t * );
+            *pi64 = p_sys->i_pcr >= 0 ? p_sys->i_pcr : 0;
+            return VLC_SUCCESS;
+
+        case DEMUX_SET_TIME:
+        {
+            int64_t i_pos;
+            i64 = (int64_t)va_arg( args, int64_t );
+
+            i_pos = demux_IndexConvertTime( &p_sys->idx, i64 );
+            if( i_pos < 0 )
+                return VLC_EGENERIC;
+
+            if( stream_Seek( p_demux->s, i_pos ) )
+                return VLC_EGENERIC;
+
+            p_sys->i_pcr = -1;
+
+            while( !p_demux->b_die )
+            {
+                frame_header_t fh;
+
+                if( FrameHeaderLoad( p_demux, &fh ) )
+                    return VLC_EGENERIC;
+
+                if( fh.i_type == 'A' || fh.i_type == 'V' )
+                {
+                    int64_t i_time = (int64_t)fh.i_timecode*1000;
+                    int64_t i_tell = stream_Tell(p_demux->s)-12;
+
+                    demux_IndexAppend( &p_sys->idx, i_time, i_tell );
+
+                    if( i_time >= i64 )
+                        return stream_Seek( p_demux->s, i_tell );
+                }
+                if( fh.i_type != 'R' )
+                    stream_Read( p_demux->s, NULL, fh.i_length );
+            }
+            return VLC_SUCCESS;
+        }
+
+        case DEMUX_GET_LENGTH:
+            pi64 = (int64_t*)va_arg( args, int64_t * );
+            return VLC_EGENERIC;
+
+        case DEMUX_GET_FPS:
+            pf = (double*)va_arg( args, double * );
+            *pf = p_sys->hdr.d_fps;
+            return VLC_SUCCESS;
+
+        case DEMUX_GET_META:
+        default:
+            return VLC_EGENERIC;
+
+    }
+}
+
+/*****************************************************************************
+ *
+ *****************************************************************************/
+static inline void GetDoubleLE( double *pd, void *src )
+{
+    /* FIXME works only if sizeof(double) == 8 */
+#ifdef WORDS_BIGENDIAN
+    uint8_t *p = (uint8_t*)pd;
+    int i;
+    for( i = 0; i < 8; i++ )
+        p[i] = src[7-i];
+#else
+    memcpy( pd, src, 8 );
+#endif
+}
+
+/* HeaderLoad:
+ */
+static int HeaderLoad( demux_t *p_demux, header_t *h )
+{
+    uint8_t buffer[72];
+
+    if( stream_Read( p_demux->s, buffer, 72 ) != 72 )
+        return VLC_EGENERIC;
+
+    /* XXX: they are alignment to take care of (another broken format) */
+    memcpy( h->id,      &buffer[ 0], 12 );
+    memcpy( h->version, &buffer[12], 5 );
+    h->i_width = GetDWLE( &buffer[20] );
+    h->i_height = GetDWLE( &buffer[24] );
+    h->i_width_desired = GetDWLE( &buffer[28] );
+    h->i_height_desired = GetDWLE( &buffer[32] );
+    h->i_mode = buffer[36];
+    GetDoubleLE( &h->d_aspect, &buffer[40] );
+    GetDoubleLE( &h->d_fps, &buffer[48] );
+    h->i_video_blocks = GetDWLE( &buffer[56] );
+    h->i_audio_blocks = GetDWLE( &buffer[60] );
+    h->i_text_blocks = GetDWLE( &buffer[64] );
+    h->i_keyframe_distance = GetDWLE( &buffer[68] );
+#if 0
+    msg_Dbg( p_demux, "nuv: h=%s v=%s %dx%d a=%f fps=%f v=%d a=%d t=%d kfd=%d",
+             h->id, h->version, h->i_width, h->i_height, h->d_aspect,
+             h->d_fps, h->i_video_blocks, h->i_audio_blocks, h->i_text_blocks,
+             h->i_keyframe_distance );
+#endif
+    return VLC_SUCCESS;
+}
+
+/* FrameHeaderLoad:
+ */
+static int FrameHeaderLoad( demux_t *p_demux, frame_header_t *h )
+{
+    uint8_t buffer[12];
+
+    if( stream_Read( p_demux->s, buffer, 12 ) != 12 )
+        return VLC_EGENERIC;
+
+    h->i_type = buffer[0];
+    h->i_compression = buffer[1];
+    h->i_keyframe = buffer[2];
+    h->i_filters = buffer[3];
+
+    h->i_timecode = GetDWLE( &buffer[4] );
+    h->i_length = GetDWLE( &buffer[8] );
+#if 0
+    msg_Dbg( p_demux, "frame hdr: t=%c c=%c k=%d f=0x%x timecode=%d l=%d",
+             h->i_type,
+             h->i_compression ? h->i_compression : ' ',
+             h->i_keyframe ? h->i_keyframe : ' ',
+             h->i_filters,
+             h->i_timecode, h->i_length );
+#endif
+    return VLC_SUCCESS;
+}
+
+static int ExtendedHeaderLoad( demux_t *p_demux, extended_header_t *h )
+{
+    uint8_t buffer[512];
+
+    if( stream_Read( p_demux->s, buffer, 512 ) != 512 )
+        return VLC_EGENERIC;
+
+    h->i_version = GetDWLE( &buffer[0] );
+    h->i_video_fcc = VLC_FOURCC( buffer[4], buffer[5], buffer[6], buffer[7] );
+    h->i_audio_fcc = VLC_FOURCC( buffer[8], buffer[9], buffer[10], buffer[11] );
+    h->i_audio_sample_rate = GetDWLE( &buffer[12] );
+    h->i_audio_bits_per_sample = GetDWLE( &buffer[16] );
+    h->i_audio_channels = GetDWLE( &buffer[20] );
+    h->i_audio_compression_ratio = GetDWLE( &buffer[24] );
+    h->i_audio_quality = GetDWLE( &buffer[28] );
+    h->i_rtjpeg_quality = GetDWLE( &buffer[32] );
+    h->i_rtjpeg_luma_filter = GetDWLE( &buffer[36] );
+    h->i_rtjpeg_chroma_filter = GetDWLE( &buffer[40] );
+    h->i_lavc_bitrate = GetDWLE( &buffer[44] );
+    h->i_lavc_qmin = GetDWLE( &buffer[48] );
+    h->i_lavc_qmin = GetDWLE( &buffer[52] );
+    h->i_lavc_maxqdiff = GetDWLE( &buffer[56] );
+    h->i_seekable_offset = GetQWLE( &buffer[60] );
+    h->i_keyframe_adjust_offset= GetQWLE( &buffer[68] );
+#if 0
+    msg_Dbg( p_demux, "ex hdr: v=%d vffc=%4.4s afcc=%4.4s %dHz %dbits ach=%d acr=%d aq=%d"
+                      "rtjpeg q=%d lf=%d lc=%d lavc br=%d qmin=%d qmax=%d maxqdiff=%d seekableoff=%lld keyfao=%lld",
+             h->i_version,
+             (char*)&h->i_video_fcc,
+             (char*)&h->i_audio_fcc, h->i_audio_sample_rate, h->i_audio_bits_per_sample, h->i_audio_channels,
+             h->i_audio_compression_ratio, h->i_audio_quality,
+             h->i_rtjpeg_quality, h->i_rtjpeg_luma_filter, h->i_rtjpeg_chroma_filter,
+             h->i_lavc_bitrate, h->i_lavc_qmin, h->i_lavc_qmax, h->i_lavc_maxqdiff,
+             h->i_seekable_offset, h->i_keyframe_adjust_offset );
+#endif
+    return VLC_SUCCESS;
+}
+
+/*****************************************************************************/
+#define DEMUX_INDEX_SIZE_MAX (100000)
+static void demux_IndexInit( demux_index_t *p_idx )
+{
+    p_idx->i_idx = 0;
+    p_idx->i_idx_max = 0;
+    p_idx->idx = NULL;
+}
+static void demux_IndexClean( demux_index_t *p_idx )
+{
+    if( p_idx->idx )
+    {
+        free( p_idx->idx );
+        p_idx->idx = NULL;
+    }
+}
+static void demux_IndexAppend( demux_index_t *p_idx,
+                               int64_t i_time, int64_t i_offset )
+{
+    /* Be sure to append new entry (we don't insert point) */
+    if( p_idx->i_idx > 0 && p_idx->idx[p_idx->i_idx-1].i_time >= i_time )
+        return;
+
+    /* */
+    if( p_idx->i_idx >= p_idx->i_idx_max )
+    {
+        if( p_idx->i_idx >= DEMUX_INDEX_SIZE_MAX )
+        {
+            /* Avoid too big index */
+            const int64_t i_length = p_idx->idx[p_idx->i_idx-1].i_time -
+                                                        p_idx->idx[0].i_time;
+            const int i_count = DEMUX_INDEX_SIZE_MAX/2;
+            int i, j;
+
+            /* We try to reduce the resolution of the index by a factor 2 */
+            for( i = 1, j = 1; i < p_idx->i_idx; i++ )
+            {
+                if( p_idx->idx[i].i_time < j * i_length / i_count )
+                    continue;
+
+                p_idx->idx[j++] = p_idx->idx[i];
+            }
+            p_idx->i_idx = j;
+
+            if( p_idx->i_idx > 3 * DEMUX_INDEX_SIZE_MAX / 4 )
+            {
+                /* We haven't created enough space
+                 * (This method won't create a good index but work for sure) */
+                for( i = 0; i < p_idx->i_idx/2; i++ )
+                    p_idx->idx[i] = p_idx->idx[2*i];
+                p_idx->i_idx /= 2;
+            }
+        }
+        else
+        {
+            p_idx->i_idx_max += 1000;
+            p_idx->idx = realloc( p_idx->idx,
+                                  p_idx->i_idx_max*sizeof(demux_index_entry_t));
+        }
+    }
+
+    /* */
+    p_idx->idx[p_idx->i_idx].i_time = i_time;
+    p_idx->idx[p_idx->i_idx].i_offset = i_offset;
+
+    p_idx->i_idx++;
+}
+static int64_t demux_IndexConvertTime( demux_index_t *p_idx, int64_t i_time )
+{
+    int i_min = 0;
+    int i_max = p_idx->i_idx-1;
+
+    /* Empty index */
+    if( p_idx->i_idx <= 0 )
+        return -1;
+
+    /* Special border case */
+    if( i_time <= p_idx->idx[0].i_time )
+        return p_idx->idx[0].i_offset;
+    if( i_time >= p_idx->idx[i_max].i_time )
+        return p_idx->idx[i_max].i_offset;
+
+    /* Dicho */
+    for( ;; )
+    {
+        int i_med;
+
+        if( i_max - i_min <= 1 )
+            break;
+
+        i_med = (i_min+i_max)/2;
+        if( p_idx->idx[i_med].i_time < i_time )
+            i_min = i_med;
+        else if( p_idx->idx[i_med].i_time > i_time )
+            i_max = i_med;
+        else
+            return p_idx->idx[i_med].i_offset;
+    }
+
+    /* return nearest in time */
+    if( i_time - p_idx->idx[i_min].i_time < p_idx->idx[i_max].i_time - i_time )
+        return p_idx->idx[i_min].i_offset;
+    else
+        return p_idx->idx[i_max].i_offset;
+}
+
+
+static int64_t demux_IndexFindOffset( demux_index_t *p_idx, int64_t i_offset )
+{
+    int i_min = 0;
+    int i_max = p_idx->i_idx-1;
+
+    /* Empty index */
+    if( p_idx->i_idx <= 0 )
+        return -1;
+
+    /* Special border case */
+    if( i_offset <= p_idx->idx[0].i_offset )
+        return p_idx->idx[0].i_offset;
+    if( i_offset == p_idx->idx[i_max].i_offset )
+        return p_idx->idx[i_max].i_offset;
+    if( i_offset > p_idx->idx[i_max].i_offset )
+        return -1;
+
+    /* Dicho */
+    for( ;; )
+    {
+        int i_med;
+
+        if( i_max - i_min <= 1 )
+            break;
+
+        i_med = (i_min+i_max)/2;
+        if( p_idx->idx[i_med].i_offset < i_offset )
+            i_min = i_med;
+        else if( p_idx->idx[i_med].i_offset > i_offset )
+            i_max = i_med;
+        else
+            return p_idx->idx[i_med].i_offset;
+    }
+
+    /* return nearest */
+    if( i_offset - p_idx->idx[i_min].i_offset < p_idx->idx[i_max].i_offset - i_offset )
+        return p_idx->idx[i_min].i_offset;
+    else
+        return p_idx->idx[i_max].i_offset;
+}