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FFmpeg/libavformat/avidec.c

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  1. /*

  2.  * AVI decoder.

  3.  * Copyright (c) 2001 Fabrice Bellard.

  4.  *

  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.

  9.  *

  10.  * This library is distributed in the hope that it will be useful,

  11.  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  12.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

  13.  * Lesser General Public License for more details.

  14.  *

  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

  18.  */

  19. #include "avformat.h"

  20. #include "avi.h"

  21. #include "dv.h"

  22. 

  23. //#define DEBUG

  24. 

  25. typedef struct AVIIndex {

  26.     unsigned char tag[4];

  27.     unsigned int flags, pos, len;

  28.     struct AVIIndex *next;

  29. } AVIIndex;

  30. 

  31. typedef struct {

  32.     int64_t  riff_end;

  33.     int64_t  movi_end;

  34.     offset_t movi_list;

  35.     AVIIndex *first, *last;

  36.     void* dv_demux;

  37. } AVIContext;

  38. 

  39. #ifdef DEBUG

  40. static void print_tag(const char *str, unsigned int tag, int size)

  41. {

  42.     printf("%s: tag=%c%c%c%c size=0x%x\n",

  43.            str, tag & 0xff,

  44.            (tag >> 8) & 0xff,

  45.            (tag >> 16) & 0xff,

  46.            (tag >> 24) & 0xff,

  47.            size);

  48. }

  49. #endif

  50. 

  51. static int get_riff(AVIContext *avi, ByteIOContext *pb)

  52. {

  53.     uint32_t tag; 

  54.     /* check RIFF header */

  55.     tag = get_le32(pb);

  56. 

  57.     if (tag != MKTAG('R', 'I', 'F', 'F'))

  58.         return -1;

  59.     avi->riff_end = get_le32(pb);   /* RIFF chunk size */

  60.     avi->riff_end += url_ftell(pb); /* RIFF chunk end */

  61.     tag = get_le32(pb);

  62.     if (tag != MKTAG('A', 'V', 'I', ' ') && tag != MKTAG('A', 'V', 'I', 'X'))

  63.         return -1;

  64.     

  65.     return 0;

  66. }

  67. 

  68. static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)

  69. {

  70.     AVIContext *avi = s->priv_data;

  71.     ByteIOContext *pb = &s->pb;

  72.     uint32_t tag, tag1, handler;

  73.     int codec_type, stream_index, frame_period, bit_rate, scale, rate;

  74.     unsigned int size, nb_frames;

  75.     int i, n;

  76.     AVStream *st;

  77.     int xan_video = 0;  /* hack to support Xan A/V */

  78. 

  79.     if (get_riff(avi, pb) < 0)

  80.         return -1;

  81. 

  82.     /* first list tag */

  83.     stream_index = -1;

  84.     codec_type = -1;

  85.     frame_period = 0;

  86.     for(;;) {

  87.         if (url_feof(pb))

  88.             goto fail;

  89.         tag = get_le32(pb);

  90.         size = get_le32(pb);

  91. #ifdef DEBUG

  92.         print_tag("tag", tag, size);

  93. #endif

  94. 

  95.         switch(tag) {

  96.         case MKTAG('L', 'I', 'S', 'T'):

  97.             /* ignored, except when start of video packets */

  98.             tag1 = get_le32(pb);

  99. #ifdef DEBUG

  100.             print_tag("list", tag1, 0);

  101. #endif

  102.             if (tag1 == MKTAG('m', 'o', 'v', 'i')) {

  103.                 avi->movi_end = url_ftell(pb) + size - 4;

  104. #ifdef DEBUG

  105.                 printf("movi end=%Lx\n", avi->movi_end);

  106. #endif

  107.                 goto end_of_header;

  108.             }

  109.             break;

  110.         case MKTAG('a', 'v', 'i', 'h'):

  111. 	    /* avi header */

  112.             /* using frame_period is bad idea */

  113.             frame_period = get_le32(pb);

  114.             bit_rate = get_le32(pb) * 8;

  115. 	    url_fskip(pb, 4 * 4);

  116.             n = get_le32(pb);

  117.             for(i=0;i<n;i++) {

  118.                 st = av_new_stream(s, i);

  119.                 if (!st)

  120.                     goto fail;

  121. 	    }

  122.             url_fskip(pb, size - 7 * 4);

  123.             break;

  124.         case MKTAG('s', 't', 'r', 'h'):

  125.             /* stream header */

  126.             stream_index++;

  127.             tag1 = get_le32(pb);

  128.             handler = get_le32(pb); /* codec tag */

  129.             switch(tag1) {

  130.             case MKTAG('i', 'a', 'v', 's'):

  131. 	    case MKTAG('i', 'v', 'a', 's'):

  132.                 /* 

  133. 	         * After some consideration -- I don't think we 

  134. 	         * have to support anything but DV in a type1 AVIs.

  135. 	         */

  136. 	        if (s->nb_streams != 1)

  137. 		    goto fail;

  138. 	        

  139. 		if (handler != MKTAG('d', 'v', 's', 'd') &&

  140. 	            handler != MKTAG('d', 'v', 'h', 'd') &&

  141. 		    handler != MKTAG('d', 'v', 's', 'l'))

  142. 	           goto fail;

  143. 

  144. 	        avi->dv_demux = dv_init_demux(s, stream_index, stream_index + 1);

  145. 		if (!avi->dv_demux)

  146. 		    goto fail;

  147. 	        stream_index++;

  148. 	    case MKTAG('v', 'i', 'd', 's'):

  149.                 codec_type = CODEC_TYPE_VIDEO;

  150. 

  151.                 if (stream_index >= s->nb_streams) {

  152.                     url_fskip(pb, size - 8);

  153.                     break;

  154.                 } 

  155. 

  156.                 st = s->streams[stream_index];

  157. 

  158.                 get_le32(pb); /* flags */

  159.                 get_le16(pb); /* priority */

  160.                 get_le16(pb); /* language */

  161.                 get_le32(pb); /* XXX: initial frame ? */

  162.                 scale = get_le32(pb); /* scale */

  163.                 rate = get_le32(pb); /* rate */

  164. 

  165.                 if(scale && rate){

  166.                     st->codec.frame_rate = rate;

  167.                     st->codec.frame_rate_base = scale;

  168.                 }else if(frame_period){

  169.                     st->codec.frame_rate = 1000000;

  170.                     st->codec.frame_rate_base = frame_period;

  171.                 }else{

  172.                     st->codec.frame_rate = 25;

  173.                     st->codec.frame_rate_base = 1;

  174.                 }

  175.                 get_le32(pb); /* start */

  176.                 nb_frames = get_le32(pb);

  177.                 st->start_time = 0;

  178.                 st->duration = (double)nb_frames * 

  179.                     st->codec.frame_rate_base * AV_TIME_BASE / 

  180.                     st->codec.frame_rate;

  181.                 

  182. 		url_fskip(pb, size - 9 * 4);

  183.                 break;

  184.             case MKTAG('a', 'u', 'd', 's'):

  185.                 {

  186.                     unsigned int length, rate;

  187. 

  188.                     codec_type = CODEC_TYPE_AUDIO;

  189. 

  190.                     if (stream_index >= s->nb_streams) {

  191.                         url_fskip(pb, size - 8);

  192.                         break;

  193.                     } 

  194.                     st = s->streams[stream_index];

  195. 

  196.                     get_le32(pb); /* flags */

  197.                     get_le16(pb); /* priority */

  198.                     get_le16(pb); /* language */

  199.                     get_le32(pb); /* initial frame */

  200.                     get_le32(pb); /* scale */

  201.                     rate = get_le32(pb);

  202.                     get_le32(pb); /* start */

  203.                     length = get_le32(pb); /* length, in samples or bytes */

  204.                     st->start_time = 0;

  205.                     if (rate != 0)

  206.                         st->duration = (int64_t)length * AV_TIME_BASE / rate;

  207.                     url_fskip(pb, size - 9 * 4);

  208.                 }

  209.                 break;

  210.             default:

  211.                 goto fail;

  212.             }

  213.             break;

  214.         case MKTAG('s', 't', 'r', 'f'):

  215.             /* stream header */

  216.             if (stream_index >= s->nb_streams || avi->dv_demux) {

  217.                 url_fskip(pb, size);

  218.             } else {

  219.                 st = s->streams[stream_index];

  220.                 switch(codec_type) {

  221.                 case CODEC_TYPE_VIDEO:

  222.                     get_le32(pb); /* size */

  223.                     st->codec.width = get_le32(pb);

  224.                     st->codec.height = get_le32(pb);

  225.                     get_le16(pb); /* panes */

  226.                     st->codec.bits_per_sample= get_le16(pb); /* depth */

  227.                     tag1 = get_le32(pb);

  228.                     get_le32(pb); /* ImageSize */

  229.                     get_le32(pb); /* XPelsPerMeter */

  230.                     get_le32(pb); /* YPelsPerMeter */

  231.                     get_le32(pb); /* ClrUsed */

  232.                     get_le32(pb); /* ClrImportant */

  233. 

  234.                     st->codec.extradata_size= size - 10*4;

  235.                     st->codec.extradata= av_malloc(st->codec.extradata_size);

  236.                     get_buffer(pb, st->codec.extradata, st->codec.extradata_size);

  237.                     

  238.                     if(st->codec.extradata_size & 1) //FIXME check if the encoder really did this correctly

  239.                         get_byte(pb);

  240. 

  241. #ifdef DEBUG

  242.                     print_tag("video", tag1, 0);

  243. #endif

  244.                     st->codec.codec_type = CODEC_TYPE_VIDEO;

  245.                     st->codec.codec_tag = tag1;

  246.                     st->codec.codec_id = codec_get_id(codec_bmp_tags, tag1);

  247.                     if (st->codec.codec_id == CODEC_ID_XAN_WC4)

  248.                         xan_video = 1;

  249. //                    url_fskip(pb, size - 5 * 4);

  250.                     break;

  251.                 case CODEC_TYPE_AUDIO:

  252.                     get_wav_header(pb, &st->codec, size);

  253.                     if (size%2) /* 2-aligned (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */

  254.                         url_fskip(pb, 1);

  255.                     /* special case time: To support Xan DPCM, hardcode

  256.                      * the format if Xxan is the video codec */

  257.                     if (xan_video)

  258.                         st->codec.codec_id = CODEC_ID_XAN_DPCM;

  259.                     break;

  260.                 default:

  261.                     url_fskip(pb, size);

  262.                     break;

  263.                 }

  264.             }

  265.             break;

  266.         default:

  267.             /* skip tag */

  268.             size += (size & 1);

  269.             url_fskip(pb, size);

  270.             break;

  271.         }

  272.     }

  273.  end_of_header:

  274.     /* check stream number */

  275.     if (stream_index != s->nb_streams - 1) {

  276.     fail:

  277.         for(i=0;i<s->nb_streams;i++) {

  278.             av_freep(&s->streams[i]->codec.extradata);

  279.             av_freep(&s->streams[i]);

  280.         }

  281.         return -1;

  282.     }

  283. 

  284.     return 0;

  285. }

  286. 

  287. static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)

  288. {

  289.     AVIContext *avi = s->priv_data;

  290.     ByteIOContext *pb = &s->pb;

  291.     int n, d[8], size, i;

  292.     void* dstr;

  293. 

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

  295.    

  296.     if (avi->dv_demux) {

  297.         size = dv_get_packet(avi->dv_demux, pkt);

  298. 	if (size >= 0)

  299. 	    return size;

  300.     }

  301.         

  302.     for(i=url_ftell(pb); !url_feof(pb); i++) {

  303.         int j;

  304. 

  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. 

  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'

  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] == '_'))

  345.             && n < s->nb_streams

  346.             && i + size <= avi->movi_end) {

  347.         

  348.             av_new_packet(pkt, size);

  349.             get_buffer(pb, pkt->data, size);

  350.             if (size & 1) {

  351.                 get_byte(pb);

  352. 		size++;

  353. 	    }

  354. 	

  355. 	    if (avi->dv_demux) {

  356. 	        dstr = pkt->destruct;

  357. 	        size = dv_produce_packet(avi->dv_demux, pkt,

  358. 		                         pkt->data, pkt->size);

  359. 		pkt->destruct = dstr;

  360. 	    } else {

  361.                 pkt->stream_index = n;

  362.                 pkt->flags |= PKT_FLAG_KEY; // FIXME: We really should read 

  363. 		                            //        index for that

  364. 	    }

  365.             return size;

  366.         }

  367.     }

  368.     return -1;

  369. }

  370. 

  371. static int avi_read_close(AVFormatContext *s)

  372. {

  373.     int i;

  374.     AVIContext *avi = s->priv_data;

  375. 

  376.     for(i=0;i<s->nb_streams;i++) {

  377.         AVStream *st = s->streams[i];

  378. //        av_free(st->priv_data);

  379.         av_free(st->codec.extradata);

  380.     }

  381. 

  382.     if (avi->dv_demux)

  383.         av_free(avi->dv_demux);

  384. 

  385.     return 0;

  386. }

  387. 

  388. static int avi_probe(AVProbeData *p)

  389. {

  390.     /* check file header */

  391.     if (p->buf_size <= 32)

  392.         return 0;

  393.     if (p->buf[0] == 'R' && p->buf[1] == 'I' &&

  394.         p->buf[2] == 'F' && p->buf[3] == 'F' &&

  395.         p->buf[8] == 'A' && p->buf[9] == 'V' &&

  396.         p->buf[10] == 'I' && p->buf[11] == ' ')

  397.         return AVPROBE_SCORE_MAX;

  398.     else

  399.         return 0;

  400. }

  401. 

  402. static AVInputFormat avi_iformat = {

  403.     "avi",

  404.     "avi format",

  405.     sizeof(AVIContext),

  406.     avi_probe,

  407.     avi_read_header,

  408.     avi_read_packet,

  409.     avi_read_close,

  410. };

  411. 

  412. int avidec_init(void)

  413. {

  414.     av_register_input_format(&avi_iformat);

  415.     return 0;

  416. }