[libav.git] / libavformat / avidec.c

/*
 * AVI decoder.
 * Copyright (c) 2001 Fabrice Bellard.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
#include "avformat.h"
#include "avi.h"

//#define DEBUG

static const struct AVI1Handler {
   enum CodecID vcid;
   enum CodecID acid;
   uint32_t tag;
} AVI1Handlers[] = {
  { CODEC_ID_DVVIDEO, CODEC_ID_DVAUDIO, MKTAG('d', 'v', 's', 'd') },
  { CODEC_ID_DVVIDEO, CODEC_ID_DVAUDIO, MKTAG('d', 'v', 'h', 'd') },
  { CODEC_ID_DVVIDEO, CODEC_ID_DVAUDIO, MKTAG('d', 'v', 's', 'l') },
  /* This is supposed to be the last one */
  { CODEC_ID_NONE, CODEC_ID_NONE, 0 },
};

typedef struct AVIIndex {
    unsigned char tag[4];
    unsigned int flags, pos, len;
    struct AVIIndex *next;
} AVIIndex;

typedef struct {
    int64_t riff_end;
    int64_t movi_end;
    int     type;
    uint8_t *buf;
    int      buf_size;
    int      stream_index;
    offset_t movi_list;
    AVIIndex *first, *last;
} AVIContext;

#ifdef DEBUG
static void print_tag(const char *str, unsigned int tag, int size)
{
    printf("%s: tag=%c%c%c%c size=0x%x\n",
           str, tag & 0xff,
           (tag >> 8) & 0xff,
           (tag >> 16) & 0xff,
           (tag >> 24) & 0xff,
           size);
}
#endif

static int get_riff(AVIContext *avi, ByteIOContext *pb)
{
    uint32_t tag; 
    /* check RIFF header */
    tag = get_le32(pb);

    if (tag != MKTAG('R', 'I', 'F', 'F'))
        return -1;
    avi->riff_end = get_le32(pb);   /* RIFF chunk size */
    avi->riff_end += url_ftell(pb); /* RIFF chunk end */
    tag = get_le32(pb);
    if (tag != MKTAG('A', 'V', 'I', ' ') && tag != MKTAG('A', 'V', 'I', 'X'))
        return -1;
    
    return 0;
}

static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
{
    AVIContext *avi = s->priv_data;
    ByteIOContext *pb = &s->pb;
    uint32_t tag, tag1, handler;
    int codec_type, stream_index, frame_period, bit_rate, scale, rate;
    unsigned int size;
    int i;
    AVStream *st;

    if (get_riff(avi, pb) < 0)
        return -1;

    /* first list tag */
    stream_index = -1;
    codec_type = -1;
    frame_period = 0;
    avi->type = 2;
    avi->buf = av_malloc(1);
    if (!avi->buf)
        return -1;
    avi->buf_size = 1;
    for(;;) {
        if (url_feof(pb))
            goto fail;
        tag = get_le32(pb);
        size = get_le32(pb);
#ifdef DEBUG
        print_tag("tag", tag, size);
#endif

        switch(tag) {
        case MKTAG('L', 'I', 'S', 'T'):
            /* ignored, except when start of video packets */
            tag1 = get_le32(pb);
#ifdef DEBUG
            print_tag("list", tag1, 0);
#endif
            if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
                avi->movi_end = url_ftell(pb) + size - 4;
#ifdef DEBUG
                printf("movi end=%Lx\n", avi->movi_end);
#endif
                goto end_of_header;
            }
            break;
        case MKTAG('a', 'v', 'i', 'h'):
	    /* avi header */
            /* using frame_period is bad idea */
            frame_period = get_le32(pb);
            bit_rate = get_le32(pb) * 8;
	    url_fskip(pb, 4 * 4);
            s->nb_streams = get_le32(pb);
            for(i=0;i<s->nb_streams;i++) {
                AVStream *st = av_mallocz(sizeof(AVStream));
                if (!st)
                    goto fail;
                avcodec_get_context_defaults(&st->codec);

                s->streams[i] = st;
	    }
            url_fskip(pb, size - 7 * 4);
            break;
        case MKTAG('s', 't', 'r', 'h'):
            /* stream header */
            stream_index++;
            tag1 = get_le32(pb);
            switch(tag1) {
            case MKTAG('i', 'a', 'v', 's'):
	    case MKTAG('i', 'v', 'a', 's'):
	        if (s->nb_streams != 1)
		    goto fail;
		avi->type = 1;
		avi->stream_index = 0;
	    case MKTAG('v', 'i', 'd', 's'):
                codec_type = CODEC_TYPE_VIDEO;

                if (stream_index >= s->nb_streams) {
                    url_fskip(pb, size - 4);
                    break;
                } 

                st = s->streams[stream_index];

                handler = get_le32(pb); /* codec tag */
                get_le32(pb); /* flags */
                get_le16(pb); /* priority */
                get_le16(pb); /* language */
                get_le32(pb); /* XXX: initial frame ? */
                scale = get_le32(pb); /* scale */
                rate = get_le32(pb); /* rate */

                if(scale && rate){
                    st->codec.frame_rate = rate;
                    st->codec.frame_rate_base = scale;
                }else if(frame_period){
                    st->codec.frame_rate = 1000000;
                    st->codec.frame_rate_base = frame_period;
                }else{
                    st->codec.frame_rate = 25;
                    st->codec.frame_rate_base = 1;
                }
                
                if (avi->type == 1) {
                    AVStream *st = av_mallocz(sizeof(AVStream));
                    if (!st)
		        goto fail;
                    
		    avcodec_get_context_defaults(&st->codec);
		    s->streams[s->nb_streams++] = st;
		    stream_index++;
		    
		    for (i=0; AVI1Handlers[i].tag != 0; ++i)
		       if (AVI1Handlers[i].tag == handler)
		           break;

		    if (AVI1Handlers[i].tag != 0) {
		        s->streams[0]->codec.codec_type = CODEC_TYPE_VIDEO;
                        s->streams[0]->codec.codec_id   = AVI1Handlers[i].vcid;
		        s->streams[1]->codec.codec_type = CODEC_TYPE_AUDIO;
                        s->streams[1]->codec.codec_id   = AVI1Handlers[i].acid;
		    } else
		        goto fail;
		}
		
		url_fskip(pb, size - 7 * 4);
                break;
            case MKTAG('a', 'u', 'd', 's'):
                codec_type = CODEC_TYPE_AUDIO;
                /* nothing really useful */
                url_fskip(pb, size - 4);
                break;
            default:
                goto fail;
            }
            break;
        case MKTAG('s', 't', 'r', 'f'):
            /* stream header */
            if (stream_index >= s->nb_streams || avi->type == 1) {
                url_fskip(pb, size);
            } else {
                st = s->streams[stream_index];
                switch(codec_type) {
                case CODEC_TYPE_VIDEO:
                    get_le32(pb); /* size */
                    st->codec.width = get_le32(pb);
                    st->codec.height = get_le32(pb);
                    get_le16(pb); /* panes */
                    st->codec.bits_per_sample= get_le16(pb); /* depth */
                    tag1 = get_le32(pb);
                    get_le32(pb); /* ImageSize */
                    get_le32(pb); /* XPelsPerMeter */
                    get_le32(pb); /* YPelsPerMeter */
                    get_le32(pb); /* ClrUsed */
                    get_le32(pb); /* ClrImportant */

                    st->codec.extradata_size= size - 10*4;
                    st->codec.extradata= av_malloc(st->codec.extradata_size); //FIXME where should we free this?
                    get_buffer(pb, st->codec.extradata, st->codec.extradata_size);
                    
                    if(st->codec.extradata_size & 1) //FIXME check if the encoder really did this correctly
                        get_byte(pb);

#ifdef DEBUG
                    print_tag("video", tag1, 0);
#endif
                    st->codec.codec_type = CODEC_TYPE_VIDEO;
                    st->codec.codec_tag = tag1;
                    st->codec.codec_id = codec_get_id(codec_bmp_tags, tag1);
//                    url_fskip(pb, size - 5 * 4);
                    break;
                case CODEC_TYPE_AUDIO:
                    get_wav_header(pb, &st->codec, size);
                    if (size%2) /* 2-aligned (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
                        url_fskip(pb, 1);
                    break;
                default:
                    url_fskip(pb, size);
                    break;
                }
            }
            break;
        default:
            /* skip tag */
            size += (size & 1);
            url_fskip(pb, size);
            break;
        }
    }
 end_of_header:
    /* check stream number */
    if (stream_index != s->nb_streams - 1) {
    fail:
        for(i=0;i<s->nb_streams;i++) {
            av_freep(&s->streams[i]->codec.extradata);
            av_freep(&s->streams[i]);
        }
        return -1;
    }

    return 0;
}

static void __destruct_pkt(struct AVPacket *pkt)
{
    pkt->data = NULL; pkt->size = 0;
    return;
}

static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
{
    AVIContext *avi = s->priv_data;
    ByteIOContext *pb = &s->pb;
    int n, d[8], size, i;

    memset(d, -1, sizeof(int)*8);

    if (avi->type == 1 && avi->stream_index)
        goto pkt_init;

    for(i=url_ftell(pb); !url_feof(pb); i++) {
        int j;

	if (i >= avi->movi_end) { /* Let's see if it's an OpenDML AVI */
	    uint32_t tag, size, tag2;
	    url_fskip(pb, avi->riff_end - url_ftell(pb));
	    if (get_riff(avi, pb) < 0)
	        return -1;
	    
	    tag = get_le32(pb);
	    size = get_le32(pb);
	    tag2 = get_le32(pb);
	    if (tag == MKTAG('L','I','S','T') && tag2 == MKTAG('m','o','v','i'))
	        avi->movi_end = url_ftell(pb) + size - 4; 
	    else
	        return -1;
	}

        for(j=0; j<7; j++)
            d[j]= d[j+1];
        d[7]= get_byte(pb);
        
        size= d[4] + (d[5]<<8) + (d[6]<<16) + (d[7]<<24);
        
        //parse ix##
        n= (d[2] - '0') * 10 + (d[3] - '0');
        if(    d[2] >= '0' && d[2] <= '9'
            && d[3] >= '0' && d[3] <= '9'
            && d[0] == 'i' && d[1] == 'x'
            && n < s->nb_streams
            && i + size <= avi->movi_end){
            
            url_fskip(pb, size);
        }
        
        //parse ##dc/##wb
        n= (d[0] - '0') * 10 + (d[1] - '0');
        if(    d[0] >= '0' && d[0] <= '9'
            && d[1] >= '0' && d[1] <= '9'
            && ((d[2] == 'd' && d[3] == 'c') || 
	        (d[2] == 'w' && d[3] == 'b') || 
		(d[2] == 'd' && d[3] == 'b') ||
		(d[2] == '_' && d[3] == '_'))
            && n < s->nb_streams
            && i + size <= avi->movi_end) {
        
	    uint8_t *tbuf = av_realloc(avi->buf, size + FF_INPUT_BUFFER_PADDING_SIZE);
	    if (!tbuf)
		return -1;
	    avi->buf = tbuf;
            avi->buf_size = size;
	    get_buffer(pb, avi->buf, size);
	    if (size & 1)
	        get_byte(pb);
	    if (avi->type != 1)
	        avi->stream_index = n;
	    goto pkt_init;
        }
    }
    
    return -1;

pkt_init:
    av_init_packet(pkt);
    pkt->data = avi->buf;
    pkt->size = avi->buf_size;
    pkt->destruct = __destruct_pkt;
    pkt->stream_index = avi->stream_index;
    avi->stream_index = !avi->stream_index;
    return 0;
}

static int avi_read_close(AVFormatContext *s)
{
    return 0;
}

static int avi_probe(AVProbeData *p)
{
    /* check file header */
    if (p->buf_size <= 32)
        return 0;
    if (p->buf[0] == 'R' && p->buf[1] == 'I' &&
        p->buf[2] == 'F' && p->buf[3] == 'F' &&
        p->buf[8] == 'A' && p->buf[9] == 'V' &&
        p->buf[10] == 'I' && p->buf[11] == ' ')
        return AVPROBE_SCORE_MAX;
    else
        return 0;
}

static AVInputFormat avi_iformat = {
    "avi",
    "avi format",
    sizeof(AVIContext),
    avi_probe,
    avi_read_header,
    avi_read_packet,
    avi_read_close,
};

int avidec_init(void)
{
    av_register_input_format(&avi_iformat);
    return 0;
}
Commit	Line	Data
de6d9b64 FB	1	/*
de6d9b64 FB	2	* AVI decoder.
19720f15	3	* Copyright (c) 2001 Fabrice Bellard.
de6d9b64	4	*
19720f15 FB	5	* This library is free software; you can redistribute it and/or
	6	* modify it under the terms of the GNU Lesser General Public
	7	* License as published by the Free Software Foundation; either
	8	* version 2 of the License, or (at your option) any later version.
de6d9b64	9	*
19720f15	10	* This library is distributed in the hope that it will be useful,
de6d9b64	11	* but WITHOUT ANY WARRANTY; without even the implied warranty of
19720f15 FB	12	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19720f15 FB	13	* Lesser General Public License for more details.
de6d9b64	14	*
19720f15 FB	15	* You should have received a copy of the GNU Lesser General Public
	16	* License along with this library; if not, write to the Free Software
	17	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
de6d9b64	18	*/
de6d9b64 FB	19	#include "avformat.h"
	20	#include "avi.h"
	21
	22	//#define DEBUG
	23
deb0a292 RS	24	static const struct AVI1Handler {
	25	enum CodecID vcid;
	26	enum CodecID acid;
	27	uint32_t tag;
	28	} AVI1Handlers[] = {
	29	{ CODEC_ID_DVVIDEO, CODEC_ID_DVAUDIO, MKTAG('d', 'v', 's', 'd') },
	30	{ CODEC_ID_DVVIDEO, CODEC_ID_DVAUDIO, MKTAG('d', 'v', 'h', 'd') },
	31	{ CODEC_ID_DVVIDEO, CODEC_ID_DVAUDIO, MKTAG('d', 'v', 's', 'l') },
	32	/* This is supposed to be the last one */
	33	{ CODEC_ID_NONE, CODEC_ID_NONE, 0 },
	34	};
	35
de6d9b64 FB	36	typedef struct AVIIndex {
	37	unsigned char tag[4];
	38	unsigned int flags, pos, len;
	39	struct AVIIndex *next;
	40	} AVIIndex;
	41
	42	typedef struct {
06219cb1	43	int64_t riff_end;
0c1a9eda	44	int64_t movi_end;
deb0a292 RS	45	int type;
	46	uint8_t *buf;
	47	int buf_size;
	48	int stream_index;
de6d9b64 FB	49	offset_t movi_list;
	50	AVIIndex first, last;
	51	} AVIContext;
	52
	53	#ifdef DEBUG
1101abfe	54	static void print_tag(const char *str, unsigned int tag, int size)
de6d9b64 FB	55	{
	56	printf("%s: tag=%c%c%c%c size=0x%x\n",
	57	str, tag & 0xff,
	58	(tag >> 8) & 0xff,
	59	(tag >> 16) & 0xff,
	60	(tag >> 24) & 0xff,
	61	size);
	62	}
	63	#endif
	64
06219cb1 RS	65	static int get_riff(AVIContext avi, ByteIOContext pb)
	66	{
	67	uint32_t tag;
	68	/* check RIFF header */
	69	tag = get_le32(pb);
	70
	71	if (tag != MKTAG('R', 'I', 'F', 'F'))
	72	return -1;
	73	avi->riff_end = get_le32(pb); /* RIFF chunk size */
	74	avi->riff_end += url_ftell(pb); /* RIFF chunk end */
	75	tag = get_le32(pb);
	76	if (tag != MKTAG('A', 'V', 'I', ' ') && tag != MKTAG('A', 'V', 'I', 'X'))
	77	return -1;
	78
	79	return 0;
	80	}
	81
1101abfe	82	static int avi_read_header(AVFormatContext s, AVFormatParameters ap)
de6d9b64	83	{
c9a65ca8	84	AVIContext *avi = s->priv_data;
de6d9b64	85	ByteIOContext *pb = &s->pb;
deb0a292	86	uint32_t tag, tag1, handler;
b559b29b	87	int codec_type, stream_index, frame_period, bit_rate, scale, rate;
a26058a5	88	unsigned int size;
e095026a	89	int i;
de6d9b64 FB	90	AVStream *st;
de6d9b64 FB	91
06219cb1	92	if (get_riff(avi, pb) < 0)
de6d9b64	93	return -1;
1101abfe	94
de6d9b64 FB	95	/* first list tag */
	96	stream_index = -1;
	97	codec_type = -1;
	98	frame_period = 0;
deb0a292 RS	99	avi->type = 2;
	100	avi->buf = av_malloc(1);
	101	if (!avi->buf)
	102	return -1;
	103	avi->buf_size = 1;
de6d9b64 FB	104	for(;;) {
	105	if (url_feof(pb))
	106	goto fail;
	107	tag = get_le32(pb);
	108	size = get_le32(pb);
	109	#ifdef DEBUG
	110	print_tag("tag", tag, size);
	111	#endif
	112
	113	switch(tag) {
	114	case MKTAG('L', 'I', 'S', 'T'):
	115	/* ignored, except when start of video packets */
	116	tag1 = get_le32(pb);
	117	#ifdef DEBUG
	118	print_tag("list", tag1, 0);
	119	#endif
	120	if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
	121	avi->movi_end = url_ftell(pb) + size - 4;
	122	#ifdef DEBUG
	123	printf("movi end=%Lx\n", avi->movi_end);
	124	#endif
	125	goto end_of_header;
	126	}
	127	break;
	128	case MKTAG('a', 'v', 'i', 'h'):
1101abfe ZK	129	/* avi header */
1101abfe ZK	130	/* using frame_period is bad idea */
de6d9b64 FB	131	frame_period = get_le32(pb);
de6d9b64 FB	132	bit_rate = get_le32(pb) * 8;
1101abfe	133	url_fskip(pb, 4 * 4);
de6d9b64 FB	134	s->nb_streams = get_le32(pb);
de6d9b64 FB	135	for(i=0;i<s->nb_streams;i++) {
1101abfe	136	AVStream *st = av_mallocz(sizeof(AVStream));
de6d9b64 FB	137	if (!st)
de6d9b64 FB	138	goto fail;
1e491e29 MN	139	avcodec_get_context_defaults(&st->codec);
1e491e29 MN	140
de6d9b64	141	s->streams[i] = st;
1101abfe	142	}
de6d9b64 FB	143	url_fskip(pb, size - 7 * 4);
	144	break;
	145	case MKTAG('s', 't', 'r', 'h'):
	146	/* stream header */
	147	stream_index++;
	148	tag1 = get_le32(pb);
	149	switch(tag1) {
deb0a292 RS	150	case MKTAG('i', 'a', 'v', 's'):
	151	case MKTAG('i', 'v', 'a', 's'):
	152	if (s->nb_streams != 1)
	153	goto fail;
	154	avi->type = 1;
	155	avi->stream_index = 0;
	156	case MKTAG('v', 'i', 'd', 's'):
de6d9b64	157	codec_type = CODEC_TYPE_VIDEO;
b559b29b MN	158
	159	if (stream_index >= s->nb_streams) {
	160	url_fskip(pb, size - 4);
	161	break;
	162	}
	163
	164	st = s->streams[stream_index];
	165
deb0a292	166	handler = get_le32(pb); /* codec tag */
de6d9b64 FB	167	get_le32(pb); /* flags */
	168	get_le16(pb); /* priority */
	169	get_le16(pb); /* language */
	170	get_le32(pb); /* XXX: initial frame ? */
deb0a292 RS	171	scale = get_le32(pb); /* scale */
deb0a292 RS	172	rate = get_le32(pb); /* rate */
b559b29b	173
14bea432 MN	174	if(scale && rate){
14bea432 MN	175	st->codec.frame_rate = rate;
deb0a292	176	st->codec.frame_rate_base = scale;
14bea432 MN	177	}else if(frame_period){
14bea432 MN	178	st->codec.frame_rate = 1000000;
deb0a292	179	st->codec.frame_rate_base = frame_period;
14bea432 MN	180	}else{
	181	st->codec.frame_rate = 25;
	182	st->codec.frame_rate_base = 1;
	183	}
b559b29b	184
deb0a292 RS	185	if (avi->type == 1) {
	186	AVStream *st = av_mallocz(sizeof(AVStream));
	187	if (!st)
	188	goto fail;
	189
	190	avcodec_get_context_defaults(&st->codec);
	191	s->streams[s->nb_streams++] = st;
	192	stream_index++;
	193
	194	for (i=0; AVI1Handlers[i].tag != 0; ++i)
	195	if (AVI1Handlers[i].tag == handler)
	196	break;
	197
	198	if (AVI1Handlers[i].tag != 0) {
	199	s->streams[0]->codec.codec_type = CODEC_TYPE_VIDEO;
	200	s->streams[0]->codec.codec_id = AVI1Handlers[i].vcid;
	201	s->streams[1]->codec.codec_type = CODEC_TYPE_AUDIO;
	202	s->streams[1]->codec.codec_id = AVI1Handlers[i].acid;
	203	} else
	204	goto fail;
	205	}
	206
	207	url_fskip(pb, size - 7 * 4);
de6d9b64 FB	208	break;
	209	case MKTAG('a', 'u', 'd', 's'):
	210	codec_type = CODEC_TYPE_AUDIO;
	211	/* nothing really useful */
9bf9a5fc MN	212	url_fskip(pb, size - 4);
	213	break;
	214	default:
	215	goto fail;
de6d9b64 FB	216	}
	217	break;
	218	case MKTAG('s', 't', 'r', 'f'):
	219	/* stream header */
deb0a292	220	if (stream_index >= s->nb_streams \|\| avi->type == 1) {
de6d9b64 FB	221	url_fskip(pb, size);
	222	} else {
	223	st = s->streams[stream_index];
	224	switch(codec_type) {
	225	case CODEC_TYPE_VIDEO:
	226	get_le32(pb); /* size */
	227	st->codec.width = get_le32(pb);
	228	st->codec.height = get_le32(pb);
de6d9b64	229	get_le16(pb); /* panes */
b559b29b	230	st->codec.bits_per_sample= get_le16(pb); /* depth */
de6d9b64	231	tag1 = get_le32(pb);
b559b29b MN	232	get_le32(pb); /* ImageSize */
	233	get_le32(pb); /* XPelsPerMeter */
	234	get_le32(pb); /* YPelsPerMeter */
	235	get_le32(pb); /* ClrUsed */
	236	get_le32(pb); /* ClrImportant */
	237
	238	st->codec.extradata_size= size - 10*4;
	239	st->codec.extradata= av_malloc(st->codec.extradata_size); //FIXME where should we free this?
	240	get_buffer(pb, st->codec.extradata, st->codec.extradata_size);
952c69c4 MN	241
	242	if(st->codec.extradata_size & 1) //FIXME check if the encoder really did this correctly
	243	get_byte(pb);
b559b29b	244
de6d9b64 FB	245	#ifdef DEBUG
	246	print_tag("video", tag1, 0);
	247	#endif
	248	st->codec.codec_type = CODEC_TYPE_VIDEO;
	249	st->codec.codec_tag = tag1;
	250	st->codec.codec_id = codec_get_id(codec_bmp_tags, tag1);
b559b29b	251	// url_fskip(pb, size - 5 * 4);
de6d9b64	252	break;
9bf9a5fc	253	case CODEC_TYPE_AUDIO:
2e7973bb	254	get_wav_header(pb, &st->codec, size);
1cef9527 FR	255	if (size%2) /* 2-aligned (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
1cef9527 FR	256	url_fskip(pb, 1);
de6d9b64 FB	257	break;
	258	default:
	259	url_fskip(pb, size);
	260	break;
	261	}
	262	}
	263	break;
	264	default:
	265	/* skip tag */
	266	size += (size & 1);
	267	url_fskip(pb, size);
	268	break;
	269	}
	270	}
	271	end_of_header:
	272	/* check stream number */
	273	if (stream_index != s->nb_streams - 1) {
	274	fail:
	275	for(i=0;i<s->nb_streams;i++) {
8a7b1b18	276	av_freep(&s->streams[i]->codec.extradata);
9145f8b3	277	av_freep(&s->streams[i]);
de6d9b64 FB	278	}
	279	return -1;
	280	}
1101abfe	281
de6d9b64 FB	282	return 0;
	283	}
	284
deb0a292 RS	285	static void __destruct_pkt(struct AVPacket *pkt)
	286	{
	287	pkt->data = NULL; pkt->size = 0;
	288	return;
	289	}
	290
1101abfe	291	static int avi_read_packet(AVFormatContext s, AVPacket pkt)
de6d9b64 FB	292	{
	293	AVIContext *avi = s->priv_data;
	294	ByteIOContext *pb = &s->pb;
df99755b	295	int n, d[8], size, i;
deb0a292	296
df99755b	297	memset(d, -1, sizeof(int)*8);
de6d9b64	298
deb0a292 RS	299	if (avi->type == 1 && avi->stream_index)
	300	goto pkt_init;
	301
06219cb1	302	for(i=url_ftell(pb); !url_feof(pb); i++) {
df99755b	303	int j;
1101abfe	304
06219cb1 RS	305	if (i >= avi->movi_end) { /* Let's see if it's an OpenDML AVI */
	306	uint32_t tag, size, tag2;
	307	url_fskip(pb, avi->riff_end - url_ftell(pb));
	308	if (get_riff(avi, pb) < 0)
	309	return -1;
	310
	311	tag = get_le32(pb);
	312	size = get_le32(pb);
	313	tag2 = get_le32(pb);
	314	if (tag == MKTAG('L','I','S','T') && tag2 == MKTAG('m','o','v','i'))
	315	avi->movi_end = url_ftell(pb) + size - 4;
	316	else
	317	return -1;
	318	}
	319
df99755b MN	320	for(j=0; j<7; j++)
	321	d[j]= d[j+1];
	322	d[7]= get_byte(pb);
	323
	324	size= d[4] + (d[5]<<8) + (d[6]<<16) + (d[7]<<24);
	325
	326	//parse ix##
	327	n= (d[2] - '0') * 10 + (d[3] - '0');
	328	if( d[2] >= '0' && d[2] <= '9'
	329	&& d[3] >= '0' && d[3] <= '9'
	330	&& d[0] == 'i' && d[1] == 'x'
	331	&& n < s->nb_streams
	332	&& i + size <= avi->movi_end){
	333
	334	url_fskip(pb, size);
	335	}
	336
	337	//parse ##dc/##wb
	338	n= (d[0] - '0') * 10 + (d[1] - '0');
	339	if( d[0] >= '0' && d[0] <= '9'
	340	&& d[1] >= '0' && d[1] <= '9'
deb0a292 RS	341	&& ((d[2] == 'd' && d[3] == 'c') \|\|
	342	(d[2] == 'w' && d[3] == 'b') \|\|
	343	(d[2] == 'd' && d[3] == 'b') \|\|
	344	(d[2] == '_' && d[3] == '_'))
df99755b	345	&& n < s->nb_streams
deb0a292	346	&& i + size <= avi->movi_end) {
df99755b	347
deb0a292 RS	348	uint8_t *tbuf = av_realloc(avi->buf, size + FF_INPUT_BUFFER_PADDING_SIZE);
	349	if (!tbuf)
	350	return -1;
	351	avi->buf = tbuf;
	352	avi->buf_size = size;
	353	get_buffer(pb, avi->buf, size);
	354	if (size & 1)
	355	get_byte(pb);
	356	if (avi->type != 1)
	357	avi->stream_index = n;
	358	goto pkt_init;
df99755b MN	359	}
	360	}
	361
	362	return -1;
deb0a292 RS	363
	364	pkt_init:
	365	av_init_packet(pkt);
	366	pkt->data = avi->buf;
	367	pkt->size = avi->buf_size;
	368	pkt->destruct = __destruct_pkt;
	369	pkt->stream_index = avi->stream_index;
	370	avi->stream_index = !avi->stream_index;
	371	return 0;
de6d9b64 FB	372	}
de6d9b64 FB	373
1101abfe	374	static int avi_read_close(AVFormatContext *s)
de6d9b64	375	{
c9a65ca8 FB	376	return 0;
	377	}
	378
	379	static int avi_probe(AVProbeData *p)
	380	{
	381	/* check file header */
	382	if (p->buf_size <= 32)
	383	return 0;
	384	if (p->buf[0] == 'R' && p->buf[1] == 'I' &&
	385	p->buf[2] == 'F' && p->buf[3] == 'F' &&
	386	p->buf[8] == 'A' && p->buf[9] == 'V' &&
	387	p->buf[10] == 'I' && p->buf[11] == ' ')
	388	return AVPROBE_SCORE_MAX;
	389	else
	390	return 0;
	391	}
	392
	393	static AVInputFormat avi_iformat = {
	394	"avi",
	395	"avi format",
	396	sizeof(AVIContext),
	397	avi_probe,
	398	avi_read_header,
	399	avi_read_packet,
	400	avi_read_close,
	401	};
	402
	403	int avidec_init(void)
	404	{
	405	av_register_input_format(&avi_iformat);
de6d9b64 FB	406	return 0;
de6d9b64 FB	407	}