avi.c

来自「VLC媒体播放程序」· C语言 代码 · 共 2,041 行 · 第 1/5 页

/*****************************************************************************
 * avi.c : AVI file Stream input module for vlc
 *****************************************************************************
 * Copyright (C) 2001-2004 VideoLAN
 * $Id: avi.c,v 1.89 2004/02/27 14:22:18 fenrir Exp $
 * Authors: Laurent Aimar <[e-mail]>
 *
 * 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 <stdlib.h>                                      /* malloc(), free() */

#include <vlc/vlc.h>
#include <vlc/input.h>

#include "vlc_meta.h"
#include "codecs.h"

#include "libavi.h"
#include "avi.h"

/*****************************************************************************
 * Module descriptor
 *****************************************************************************/

#define INTERLEAVE_TEXT N_("Force interleaved method" )
#define INTERLEAVE_LONGTEXT N_( "Force interleaved method" )

#define INDEX_TEXT N_("Force index creation")
#define INDEX_LONGTEXT N_( \
    "Recreate a index for the AVI file so we can seek trough it more reliably." ) 

static int  Open   ( vlc_object_t * );
static void Close  ( vlc_object_t * );

vlc_module_begin();
    set_description( _("AVI demuxer") );
    set_capability( "demux", 212 );

    add_bool( "avi-interleaved", 0, NULL,
              INTERLEAVE_TEXT, INTERLEAVE_LONGTEXT, VLC_TRUE );
    add_bool( "avi-index", 0, NULL,
              INDEX_TEXT, INDEX_LONGTEXT, VLC_TRUE );

    set_callbacks( Open, Close );
vlc_module_end();

/*****************************************************************************
 * Local prototypes
 *****************************************************************************/
static int    Control         ( input_thread_t *, int, va_list );
static int    Seek            ( input_thread_t *, mtime_t, int );
static int    Demux_Seekable  ( input_thread_t * );
static int    Demux_UnSeekable( input_thread_t *p_input );

#define FREE( p ) if( p ) { free( p ); (p) = NULL; }
#define __ABS( x ) ( (x) < 0 ? (-(x)) : (x) )

static inline off_t __EVEN( off_t i )
{
    return (i & 1) ? i + 1 : i;
}

static mtime_t AVI_PTSToChunk( avi_track_t *, mtime_t i_pts );
static mtime_t AVI_PTSToByte ( avi_track_t *, mtime_t i_pts );
static mtime_t AVI_GetDPTS   ( avi_track_t *, int64_t i_count );
static mtime_t AVI_GetPTS    ( avi_track_t * );


static int AVI_StreamChunkFind( input_thread_t *, unsigned int i_stream );
static int AVI_StreamChunkSet ( input_thread_t *,
                                unsigned int i_stream, unsigned int i_ck );
static int AVI_StreamBytesSet ( input_thread_t *,
                                unsigned int i_stream, off_t   i_byte );

vlc_fourcc_t AVI_FourccGetCodec( unsigned int i_cat, vlc_fourcc_t );
static int   AVI_GetKeyFlag    ( vlc_fourcc_t , uint8_t * );

static int AVI_PacketGetHeader( input_thread_t *, avi_packet_t *p_pk );
static int AVI_PacketNext     ( input_thread_t * );
static int AVI_PacketRead     ( input_thread_t *, avi_packet_t *, block_t **);
static int AVI_PacketSearch   ( input_thread_t * );

static void AVI_IndexLoad    ( input_thread_t * );
static void AVI_IndexCreate  ( input_thread_t * );
static void AVI_IndexAddEntry( demux_sys_t *, int, AVIIndexEntry_t * );

static mtime_t  AVI_MovieGetLength( input_thread_t * );

/*****************************************************************************
 * Stream management
 *****************************************************************************/
static int        AVI_TrackSeek  ( input_thread_t *, int, mtime_t );
static int        AVI_TrackStopFinishedStreams( input_thread_t *);

/* Remarks:
 - For VBR mp3 stream:
    count blocks by rounded-up chunksizes instead of chunks
    we need full emulation of dshow avi demuxer bugs :(
    fixes silly nandub-style a-v delaying in avi with vbr mp3...
    (from mplayer 2002/08/02)
 - to complete....
 */

/*****************************************************************************
 * Open: check file and initializes AVI structures
 *****************************************************************************/
static int Open( vlc_object_t * p_this )
{
    input_thread_t  *p_input = (input_thread_t *)p_this;
    demux_sys_t     *p_sys;

    avi_chunk_t         ck_riff;
    avi_chunk_list_t    *p_riff = (avi_chunk_list_t*)&ck_riff;
    avi_chunk_list_t    *p_hdrl, *p_movi;
    avi_chunk_avih_t    *p_avih;

    unsigned int i_track;
    unsigned int i;

    uint8_t  *p_peek;


    /* Is it an avi file ? */
    if( stream_Peek( p_input->s, &p_peek, 12 ) < 12 )
    {
        msg_Err( p_input, "cannot peek()" );
        return VLC_EGENERIC;
    }
    if( strncmp( &p_peek[0], "RIFF", 4 ) || strncmp( &p_peek[8], "AVI ", 4 ) )
    {
        msg_Warn( p_input, "avi module discarded (invalid header)" );
        return VLC_EGENERIC;
    }

    /* Initialize input  structures. */
    p_sys = p_input->p_demux_data = malloc( sizeof(demux_sys_t) );
    memset( p_sys, 0, sizeof( demux_sys_t ) );
    p_sys->i_time   = 0;
    p_sys->i_length = 0;
    p_sys->i_pcr    = 0;
    p_sys->i_movi_lastchunk_pos = 0;
    p_sys->b_odml   = VLC_FALSE;
    p_sys->i_track  = 0;
    p_sys->track    = NULL;
    p_sys->meta     = NULL;

    stream_Control( p_input->s, STREAM_CAN_FASTSEEK, &p_sys->b_seekable );

    p_input->pf_demux_control = Control;
    p_input->pf_demux = Demux_Seekable;
    /* For unseekable stream, automaticaly use Demux_UnSeekable */
    if( !p_sys->b_seekable || config_GetInt( p_input, "avi-interleaved" ) )
    {
        p_input->pf_demux = Demux_UnSeekable;
    }

    if( AVI_ChunkReadRoot( p_input->s, &p_sys->ck_root ) )
    {
        msg_Err( p_input, "avi module discarded (invalid file)" );
        return VLC_EGENERIC;
    }

    if( AVI_ChunkCount( &p_sys->ck_root, AVIFOURCC_RIFF ) > 1 )
    {
        unsigned int i_count =
            AVI_ChunkCount( &p_sys->ck_root, AVIFOURCC_RIFF );

        msg_Warn( p_input, "multiple riff -> OpenDML ?" );
        for( i = 1; i < i_count; i++ )
        {
            avi_chunk_list_t *p_sysx;

            p_sysx = AVI_ChunkFind( &p_sys->ck_root, AVIFOURCC_RIFF, i );
            if( p_sysx->i_type == AVIFOURCC_AVIX )
            {
                msg_Warn( p_input, "detected OpenDML file" );
                p_sys->b_odml = VLC_TRUE;
                break;
            }
        }
    }

    p_riff  = AVI_ChunkFind( &p_sys->ck_root, AVIFOURCC_RIFF, 0 );
    p_hdrl  = AVI_ChunkFind( p_riff, AVIFOURCC_hdrl, 0 );
    p_movi  = AVI_ChunkFind( p_riff, AVIFOURCC_movi, 0 );

    if( !p_hdrl || !p_movi )
    {
        msg_Err( p_input, "avi module discarded (invalid file)" );
        goto error;
    }

    if( !( p_avih = AVI_ChunkFind( p_hdrl, AVIFOURCC_avih, 0 ) ) )
    {
        msg_Err( p_input, "cannot find avih chunk" );
        goto error;
    }
    i_track = AVI_ChunkCount( p_hdrl, AVIFOURCC_strl );
    if( p_avih->i_streams != i_track )
    {
        msg_Warn( p_input,
                  "found %d stream but %d are declared",
                  i_track, p_avih->i_streams );
    }
    if( i_track == 0 )
    {
        msg_Err( p_input, "no stream defined!" );
        goto error;
    }

    /*  create one program */
    vlc_mutex_lock( &p_input->stream.stream_lock );
    if( input_InitStream( p_input, 0 ) == -1)
    {
        vlc_mutex_unlock( &p_input->stream.stream_lock );
        msg_Err( p_input, "cannot init stream" );
        goto error;
    }
    p_input->stream.i_mux_rate = 0; /* Fixed later */
    vlc_mutex_unlock( &p_input->stream.stream_lock );

    /* print informations on streams */
    msg_Dbg( p_input, "AVIH: %d stream, flags %s%s%s%s ",
             i_track,
             p_avih->i_flags&AVIF_HASINDEX?" HAS_INDEX":"",
             p_avih->i_flags&AVIF_MUSTUSEINDEX?" MUST_USE_INDEX":"",
             p_avih->i_flags&AVIF_ISINTERLEAVED?" IS_INTERLEAVED":"",
             p_avih->i_flags&AVIF_TRUSTCKTYPE?" TRUST_CKTYPE":"" );
    if( ( p_sys->meta = vlc_meta_New() ) )
    {
        char buffer[200];
        sprintf( buffer, "%s%s%s%s",
                 p_avih->i_flags&AVIF_HASINDEX?" HAS_INDEX":"",
                 p_avih->i_flags&AVIF_MUSTUSEINDEX?" MUST_USE_INDEX":"",
                 p_avih->i_flags&AVIF_ISINTERLEAVED?" IS_INTERLEAVED":"",
                 p_avih->i_flags&AVIF_TRUSTCKTYPE?" TRUST_CKTYPE":"" );
        vlc_meta_Add( p_sys->meta, VLC_META_SETTING, buffer );
    }

    /* now read info on each stream and create ES */
    for( i = 0 ; i < i_track; i++ )
    {
        avi_track_t      *tk = malloc( sizeof( avi_track_t ) );
        avi_chunk_list_t *p_strl = AVI_ChunkFind( p_hdrl, AVIFOURCC_strl, i );
        avi_chunk_strh_t *p_strh = AVI_ChunkFind( p_strl, AVIFOURCC_strh, 0 );
        avi_chunk_strf_auds_t *p_auds;
        avi_chunk_strf_vids_t *p_vids;
        es_format_t fmt;

        tk->b_activated = VLC_FALSE;
        tk->p_index     = 0;
        tk->i_idxnb     = 0;
        tk->i_idxmax    = 0;
        tk->i_idxposc   = 0;
        tk->i_idxposb   = 0;

        tk->i_blockno   = 0;
        tk->i_blocksize = 0;

        p_auds = (void*)p_vids = (void*)AVI_ChunkFind( p_strl, AVIFOURCC_strf, 0 );

        if( p_strl == NULL || p_strh == NULL || p_auds == NULL || p_vids == NULL )
        {
            msg_Warn( p_input, "stream[%d] incomplete", i );
            continue;
        }

        tk->i_rate  = p_strh->i_rate;
        tk->i_scale = p_strh->i_scale;
        tk->i_samplesize = p_strh->i_samplesize;
        msg_Dbg( p_input, "stream[%d] rate:%d scale:%d samplesize:%d",
                 i, tk->i_rate, tk->i_scale, tk->i_samplesize );

        switch( p_strh->i_type )
        {
            case( AVIFOURCC_auds ):
                tk->i_cat   = AUDIO_ES;
                tk->i_codec = AVI_FourccGetCodec( AUDIO_ES,
                                                  p_auds->p_wf->wFormatTag );
                if( ( tk->i_blocksize = p_auds->p_wf->nBlockAlign ) == 0 )
                {
                    if( p_auds->p_wf->wFormatTag == 1 )
                    {
                        tk->i_blocksize = p_auds->p_wf->nChannels * (p_auds->p_wf->wBitsPerSample/8);
                    }
                    else
                    {
                        tk->i_blocksize = 1;
                    }
                }
                es_format_Init( &fmt, AUDIO_ES, tk->i_codec );

                fmt.audio.i_channels        = p_auds->p_wf->nChannels;
                fmt.audio.i_rate            = p_auds->p_wf->nSamplesPerSec;
                fmt.i_bitrate               = p_auds->p_wf->nAvgBytesPerSec*8;
                fmt.audio.i_blockalign      = p_auds->p_wf->nBlockAlign;
                fmt.audio.i_bitspersample   = p_auds->p_wf->wBitsPerSample;
                fmt.i_extra = __MIN( p_auds->p_wf->cbSize,
                    p_auds->i_chunk_size - sizeof(WAVEFORMATEX) );
                fmt.p_extra = &p_auds->p_wf[1];
                msg_Dbg( p_input, "stream[%d] audio(0x%x) %d channels %dHz %dbits",
                         i, p_auds->p_wf->wFormatTag, p_auds->p_wf->nChannels,
                         p_auds->p_wf->nSamplesPerSec, p_auds->p_wf->wBitsPerSample);
                break;

            case( AVIFOURCC_vids ):
                tk->i_cat   = VIDEO_ES;
                tk->i_codec = AVI_FourccGetCodec( VIDEO_ES,
                                                  p_vids->p_bih->biCompression );
                if( p_vids->p_bih->biCompression == 0x00 )
                {
                    switch( p_vids->p_bih->biBitCount )
                    {
                        case 32:
                            tk->i_codec = VLC_FOURCC('R','V','3','2');
                            break;
                        case 24:
                            tk->i_codec = VLC_FOURCC('R','V','2','4');
                            break;
                        case 16:
                            /* tk->i_codec = VLC_FOURCC('R','V','1','6');*/
                            /* break;*/
                        case 15:
                            tk->i_codec = VLC_FOURCC('R','V','1','5');
                            break;
                        case 9:
                            tk->i_codec = VLC_FOURCC( 'Y', 'V', 'U', '9' ); /* <- TODO check that */
                            break;
                    }
                    es_format_Init( &fmt, VIDEO_ES, tk->i_codec );
                }
                else
                {
                    es_format_Init( &fmt, VIDEO_ES, p_vids->p_bih->biCompression );
                }
                tk->i_samplesize = 0;
                fmt.video.i_width  = p_vids->p_bih->biWidth;
                fmt.video.i_height = p_vids->p_bih->biHeight;
                fmt.video.i_bits_per_pixel = p_vids->p_bih->biBitCount;
                fmt.i_extra =
                    __MIN( p_vids->p_bih->biSize - sizeof( BITMAPINFOHEADER ),
                           p_vids->i_chunk_size - sizeof(BITMAPINFOHEADER) );
                fmt.p_extra = &p_vids->p_bih[1];
                msg_Dbg( p_input, "stream[%d] video(%4.4s) %dx%d %dbpp %ffps",
                        i,
                         (char*)&p_vids->p_bih->biCompression,
                         p_vids->p_bih->biWidth,
                         p_vids->p_bih->biHeight,
                         p_vids->p_bih->biBitCount,
                         (float)tk->i_rate/(float)tk->i_scale );
                break;
            default:
                msg_Warn( p_input, "stream[%d] unknown type", i );
                free( tk );
                continue;
        }
        tk->p_es = es_out_Add( p_input->p_es_out, &fmt );
        TAB_APPEND( p_sys->i_track, p_sys->track, tk );
    }

    if( p_sys->i_track <= 0 )
    {
        msg_Err( p_input, "no valid track" );
        goto error;
    }

    if( config_GetInt( p_input, "avi-index" ) )
    {
        if( p_sys->b_seekable )
        {
            AVI_IndexCreate( p_input );
        }
        else
        {
            msg_Warn( p_input, "cannot create index (unseekable stream)" );
            AVI_IndexLoad( p_input );
        }
    }
    else
    {
        AVI_IndexLoad( p_input );
    }

    /* *** movie length in sec *** */
    p_sys->i_length = AVI_MovieGetLength( p_input );
    if( p_sys->i_length < (mtime_t)p_avih->i_totalframes *
                          (mtime_t)p_avih->i_microsecperframe /
                          (mtime_t)1000000 )
    {
        msg_Warn( p_input, "broken or missing index, 'seek' will be axproximative or will have strange behavour" );
    }
    /* fix some BeOS MediaKit generated file */
    for( i = 0 ; i < p_sys->i_track; i++ )