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458 lines
14 KiB
458 lines
14 KiB
/* |
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* AVI decoder. |
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* Copyright (c) 2001 Fabrice Bellard. |
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* |
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* This library is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2 of the License, or (at your option) any later version. |
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* |
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* This library is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with this library; if not, write to the Free Software |
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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*/ |
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#include "avformat.h" |
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#include "avi.h" |
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|
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//#define DEBUG |
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|
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static const struct AVI1Handler { |
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enum CodecID vcid; |
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enum CodecID acid; |
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uint32_t tag; |
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} AVI1Handlers[] = { |
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{ CODEC_ID_DVVIDEO, CODEC_ID_DVAUDIO, MKTAG('d', 'v', 's', 'd') }, |
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{ CODEC_ID_DVVIDEO, CODEC_ID_DVAUDIO, MKTAG('d', 'v', 'h', 'd') }, |
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{ CODEC_ID_DVVIDEO, CODEC_ID_DVAUDIO, MKTAG('d', 'v', 's', 'l') }, |
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/* This is supposed to be the last one */ |
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{ CODEC_ID_NONE, CODEC_ID_NONE, 0 }, |
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}; |
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typedef struct AVIIndex { |
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unsigned char tag[4]; |
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unsigned int flags, pos, len; |
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struct AVIIndex *next; |
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} AVIIndex; |
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typedef struct { |
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int64_t riff_end; |
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int64_t movi_end; |
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int type; |
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uint8_t *buf; |
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int buf_size; |
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int stream_index; |
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offset_t movi_list; |
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AVIIndex *first, *last; |
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} AVIContext; |
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#ifdef DEBUG |
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static void print_tag(const char *str, unsigned int tag, int size) |
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{ |
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printf("%s: tag=%c%c%c%c size=0x%x\n", |
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str, tag & 0xff, |
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(tag >> 8) & 0xff, |
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(tag >> 16) & 0xff, |
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(tag >> 24) & 0xff, |
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size); |
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} |
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#endif |
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static int get_riff(AVIContext *avi, ByteIOContext *pb) |
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{ |
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uint32_t tag; |
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/* check RIFF header */ |
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tag = get_le32(pb); |
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if (tag != MKTAG('R', 'I', 'F', 'F')) |
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return -1; |
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avi->riff_end = get_le32(pb); /* RIFF chunk size */ |
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avi->riff_end += url_ftell(pb); /* RIFF chunk end */ |
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tag = get_le32(pb); |
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if (tag != MKTAG('A', 'V', 'I', ' ') && tag != MKTAG('A', 'V', 'I', 'X')) |
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return -1; |
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return 0; |
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} |
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static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap) |
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{ |
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AVIContext *avi = s->priv_data; |
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ByteIOContext *pb = &s->pb; |
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uint32_t tag, tag1, handler; |
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int codec_type, stream_index, frame_period, bit_rate, scale, rate; |
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unsigned int size, nb_frames; |
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int i, n; |
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AVStream *st; |
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int xan_video = 0; /* hack to support Xan A/V */ |
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if (get_riff(avi, pb) < 0) |
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return -1; |
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/* first list tag */ |
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stream_index = -1; |
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codec_type = -1; |
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frame_period = 0; |
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avi->type = 2; |
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avi->buf = av_malloc(1); |
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if (!avi->buf) |
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return -1; |
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avi->buf_size = 1; |
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for(;;) { |
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if (url_feof(pb)) |
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goto fail; |
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tag = get_le32(pb); |
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size = get_le32(pb); |
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#ifdef DEBUG |
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print_tag("tag", tag, size); |
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#endif |
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switch(tag) { |
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case MKTAG('L', 'I', 'S', 'T'): |
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/* ignored, except when start of video packets */ |
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tag1 = get_le32(pb); |
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#ifdef DEBUG |
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print_tag("list", tag1, 0); |
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#endif |
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if (tag1 == MKTAG('m', 'o', 'v', 'i')) { |
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avi->movi_end = url_ftell(pb) + size - 4; |
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#ifdef DEBUG |
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printf("movi end=%Lx\n", avi->movi_end); |
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#endif |
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goto end_of_header; |
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} |
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break; |
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case MKTAG('a', 'v', 'i', 'h'): |
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/* avi header */ |
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/* using frame_period is bad idea */ |
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frame_period = get_le32(pb); |
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bit_rate = get_le32(pb) * 8; |
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url_fskip(pb, 4 * 4); |
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n = get_le32(pb); |
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for(i=0;i<n;i++) { |
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st = av_new_stream(s, 0); |
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if (!st) |
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goto fail; |
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} |
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url_fskip(pb, size - 7 * 4); |
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break; |
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case MKTAG('s', 't', 'r', 'h'): |
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/* stream header */ |
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stream_index++; |
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tag1 = get_le32(pb); |
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switch(tag1) { |
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case MKTAG('i', 'a', 'v', 's'): |
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case MKTAG('i', 'v', 'a', 's'): |
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if (s->nb_streams != 1) |
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goto fail; |
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avi->type = 1; |
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avi->stream_index = 0; |
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case MKTAG('v', 'i', 'd', 's'): |
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codec_type = CODEC_TYPE_VIDEO; |
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if (stream_index >= s->nb_streams) { |
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url_fskip(pb, size - 4); |
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break; |
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} |
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st = s->streams[stream_index]; |
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handler = get_le32(pb); /* codec tag */ |
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get_le32(pb); /* flags */ |
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get_le16(pb); /* priority */ |
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get_le16(pb); /* language */ |
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get_le32(pb); /* XXX: initial frame ? */ |
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scale = get_le32(pb); /* scale */ |
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rate = get_le32(pb); /* rate */ |
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if(scale && rate){ |
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st->codec.frame_rate = rate; |
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st->codec.frame_rate_base = scale; |
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}else if(frame_period){ |
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st->codec.frame_rate = 1000000; |
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st->codec.frame_rate_base = frame_period; |
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}else{ |
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st->codec.frame_rate = 25; |
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st->codec.frame_rate_base = 1; |
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} |
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get_le32(pb); /* start */ |
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nb_frames = get_le32(pb); |
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st->start_time = 0; |
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st->duration = (double)nb_frames * |
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st->codec.frame_rate_base * AV_TIME_BASE / |
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st->codec.frame_rate; |
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if (avi->type == 1) { |
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AVStream *st; |
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st = av_new_stream(s, 0); |
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if (!st) |
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goto fail; |
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stream_index++; |
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for (i=0; AVI1Handlers[i].tag != 0; ++i) |
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if (AVI1Handlers[i].tag == handler) |
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break; |
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if (AVI1Handlers[i].tag != 0) { |
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s->streams[0]->codec.codec_type = CODEC_TYPE_VIDEO; |
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s->streams[0]->codec.codec_id = AVI1Handlers[i].vcid; |
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s->streams[1]->codec.codec_type = CODEC_TYPE_AUDIO; |
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s->streams[1]->codec.codec_id = AVI1Handlers[i].acid; |
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} else { |
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goto fail; |
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} |
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} |
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url_fskip(pb, size - 9 * 4); |
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break; |
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case MKTAG('a', 'u', 'd', 's'): |
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{ |
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unsigned int length, rate; |
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codec_type = CODEC_TYPE_AUDIO; |
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if (stream_index >= s->nb_streams) { |
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url_fskip(pb, size - 4); |
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break; |
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} |
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st = s->streams[stream_index]; |
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get_le32(pb); /* tag */ |
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get_le32(pb); /* flags */ |
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get_le16(pb); /* priority */ |
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get_le16(pb); /* language */ |
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get_le32(pb); /* initial frame */ |
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get_le32(pb); /* scale */ |
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rate = get_le32(pb); |
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get_le32(pb); /* start */ |
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length = get_le32(pb); /* length, in samples or bytes */ |
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st->start_time = 0; |
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if (rate != 0) |
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st->duration = (int64_t)length * AV_TIME_BASE / rate; |
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url_fskip(pb, size - 9 * 4); |
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} |
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break; |
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default: |
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goto fail; |
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} |
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break; |
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case MKTAG('s', 't', 'r', 'f'): |
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/* stream header */ |
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if (stream_index >= s->nb_streams || avi->type == 1) { |
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url_fskip(pb, size); |
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} else { |
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st = s->streams[stream_index]; |
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switch(codec_type) { |
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case CODEC_TYPE_VIDEO: |
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get_le32(pb); /* size */ |
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st->codec.width = get_le32(pb); |
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st->codec.height = get_le32(pb); |
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get_le16(pb); /* panes */ |
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st->codec.bits_per_sample= get_le16(pb); /* depth */ |
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tag1 = get_le32(pb); |
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get_le32(pb); /* ImageSize */ |
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get_le32(pb); /* XPelsPerMeter */ |
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get_le32(pb); /* YPelsPerMeter */ |
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get_le32(pb); /* ClrUsed */ |
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get_le32(pb); /* ClrImportant */ |
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st->codec.extradata_size= size - 10*4; |
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st->codec.extradata= av_malloc(st->codec.extradata_size); |
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get_buffer(pb, st->codec.extradata, st->codec.extradata_size); |
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if(st->codec.extradata_size & 1) //FIXME check if the encoder really did this correctly |
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get_byte(pb); |
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#ifdef DEBUG |
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print_tag("video", tag1, 0); |
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#endif |
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st->codec.codec_type = CODEC_TYPE_VIDEO; |
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st->codec.codec_tag = tag1; |
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st->codec.codec_id = codec_get_id(codec_bmp_tags, tag1); |
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if (st->codec.codec_id == CODEC_ID_XAN_WC4) |
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xan_video = 1; |
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// url_fskip(pb, size - 5 * 4); |
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break; |
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case CODEC_TYPE_AUDIO: |
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get_wav_header(pb, &st->codec, size); |
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if (size%2) /* 2-aligned (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */ |
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url_fskip(pb, 1); |
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/* special case time: To support Xan DPCM, hardcode |
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* the format if Xxan is the video codec */ |
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if (xan_video) |
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st->codec.codec_id = CODEC_ID_XAN_DPCM; |
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break; |
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default: |
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url_fskip(pb, size); |
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break; |
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} |
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} |
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break; |
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default: |
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/* skip tag */ |
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size += (size & 1); |
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url_fskip(pb, size); |
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break; |
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} |
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} |
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end_of_header: |
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/* check stream number */ |
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if (stream_index != s->nb_streams - 1) { |
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fail: |
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av_free(avi->buf); |
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for(i=0;i<s->nb_streams;i++) { |
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av_freep(&s->streams[i]->codec.extradata); |
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av_freep(&s->streams[i]); |
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} |
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return -1; |
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} |
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return 0; |
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} |
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static void __destruct_pkt(struct AVPacket *pkt) |
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{ |
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pkt->data = NULL; pkt->size = 0; |
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return; |
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} |
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static int avi_read_packet(AVFormatContext *s, AVPacket *pkt) |
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{ |
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AVIContext *avi = s->priv_data; |
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ByteIOContext *pb = &s->pb; |
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int n, d[8], size, i; |
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memset(d, -1, sizeof(int)*8); |
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if (avi->type == 1 && avi->stream_index) { |
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/* duplicate DV packet */ |
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av_init_packet(pkt); |
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pkt->data = avi->buf; |
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pkt->size = avi->buf_size; |
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pkt->destruct = __destruct_pkt; |
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pkt->stream_index = avi->stream_index; |
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avi->stream_index = !avi->stream_index; |
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return 0; |
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} |
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for(i=url_ftell(pb); !url_feof(pb); i++) { |
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int j; |
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if (i >= avi->movi_end) { /* Let's see if it's an OpenDML AVI */ |
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uint32_t tag, size, tag2; |
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url_fskip(pb, avi->riff_end - url_ftell(pb)); |
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if (get_riff(avi, pb) < 0) |
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return -1; |
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tag = get_le32(pb); |
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size = get_le32(pb); |
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tag2 = get_le32(pb); |
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if (tag == MKTAG('L','I','S','T') && tag2 == MKTAG('m','o','v','i')) |
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avi->movi_end = url_ftell(pb) + size - 4; |
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else |
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return -1; |
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} |
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for(j=0; j<7; j++) |
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d[j]= d[j+1]; |
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d[7]= get_byte(pb); |
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size= d[4] + (d[5]<<8) + (d[6]<<16) + (d[7]<<24); |
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//parse ix## |
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n= (d[2] - '0') * 10 + (d[3] - '0'); |
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if( d[2] >= '0' && d[2] <= '9' |
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&& d[3] >= '0' && d[3] <= '9' |
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&& d[0] == 'i' && d[1] == 'x' |
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&& n < s->nb_streams |
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&& i + size <= avi->movi_end){ |
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url_fskip(pb, size); |
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} |
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//parse ##dc/##wb |
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n= (d[0] - '0') * 10 + (d[1] - '0'); |
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if( d[0] >= '0' && d[0] <= '9' |
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&& d[1] >= '0' && d[1] <= '9' |
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&& ((d[2] == 'd' && d[3] == 'c') || |
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(d[2] == 'w' && d[3] == 'b') || |
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(d[2] == 'd' && d[3] == 'b') || |
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(d[2] == '_' && d[3] == '_')) |
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&& n < s->nb_streams |
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&& i + size <= avi->movi_end) { |
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if (avi->type == 1) { |
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uint8_t *tbuf = av_realloc(avi->buf, size + FF_INPUT_BUFFER_PADDING_SIZE); |
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if (!tbuf) |
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return -1; |
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avi->buf = tbuf; |
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avi->buf_size = size; |
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av_init_packet(pkt); |
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pkt->data = avi->buf; |
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pkt->size = avi->buf_size; |
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pkt->destruct = __destruct_pkt; |
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avi->stream_index = n; |
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} else { |
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av_new_packet(pkt, size); |
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} |
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get_buffer(pb, pkt->data, size); |
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if (size & 1) |
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get_byte(pb); |
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pkt->stream_index = n; |
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pkt->flags |= PKT_FLAG_KEY; // FIXME: We really should read index for that |
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return 0; |
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} |
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} |
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return -1; |
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} |
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static int avi_read_close(AVFormatContext *s) |
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{ |
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int i; |
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AVIContext *avi = s->priv_data; |
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av_free(avi->buf); |
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for(i=0;i<s->nb_streams;i++) { |
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AVStream *st = s->streams[i]; |
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// av_free(st->priv_data); |
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av_free(st->codec.extradata); |
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} |
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return 0; |
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} |
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static int avi_probe(AVProbeData *p) |
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{ |
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/* check file header */ |
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if (p->buf_size <= 32) |
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return 0; |
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if (p->buf[0] == 'R' && p->buf[1] == 'I' && |
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p->buf[2] == 'F' && p->buf[3] == 'F' && |
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p->buf[8] == 'A' && p->buf[9] == 'V' && |
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p->buf[10] == 'I' && p->buf[11] == ' ') |
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return AVPROBE_SCORE_MAX; |
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else |
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return 0; |
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} |
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static AVInputFormat avi_iformat = { |
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"avi", |
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"avi format", |
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sizeof(AVIContext), |
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avi_probe, |
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avi_read_header, |
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avi_read_packet, |
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avi_read_close, |
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}; |
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int avidec_init(void) |
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{ |
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av_register_input_format(&avi_iformat); |
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return 0; |
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}
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