diff options
author | Fabrice Bellard <fabrice@bellard.org> | 2002-11-25 19:07:40 +0000 |
---|---|---|
committer | Fabrice Bellard <fabrice@bellard.org> | 2002-11-25 19:07:40 +0000 |
commit | abac6175916c57f59ddb51ffe41bfd1d9851fe38 (patch) | |
tree | 8fc5b70a143f0f74468c353afbf043d7e104cdc0 /libav/avidec.c | |
parent | 57fc25764261abe71b6cf7571eca182f8acf5795 (diff) |
renamed libav to libavformat
Originally committed as revision 1276 to svn://svn.ffmpeg.org/ffmpeg/trunk
Diffstat (limited to 'libav/avidec.c')
-rw-r--r-- | libav/avidec.c | 256 |
1 files changed, 0 insertions, 256 deletions
diff --git a/libav/avidec.c b/libav/avidec.c deleted file mode 100644 index 9646408cd1..0000000000 --- a/libav/avidec.c +++ /dev/null @@ -1,256 +0,0 @@ -/* - * 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 - -typedef struct AVIIndex { - unsigned char tag[4]; - unsigned int flags, pos, len; - struct AVIIndex *next; -} AVIIndex; - -typedef struct { - INT64 movi_end; - 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 avi_read_header(AVFormatContext *s, AVFormatParameters *ap) -{ - AVIContext *avi = s->priv_data; - ByteIOContext *pb = &s->pb; - UINT32 tag, tag1; - int codec_type, stream_index, size, frame_period, bit_rate; - int i; - AVStream *st; - - /* check RIFF header */ - tag = get_le32(pb); - - if (tag != MKTAG('R', 'I', 'F', 'F')) - return -1; - get_le32(pb); /* file size */ - tag = get_le32(pb); - if (tag != MKTAG('A', 'V', 'I', ' ')) - return -1; - - /* first list tag */ - stream_index = -1; - codec_type = -1; - frame_period = 0; - 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; - 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('v', 'i', 'd', 's'): - codec_type = CODEC_TYPE_VIDEO; - get_le32(pb); /* codec tag */ - get_le32(pb); /* flags */ - get_le16(pb); /* priority */ - get_le16(pb); /* language */ - get_le32(pb); /* XXX: initial frame ? */ - get_le32(pb); /* scale */ - get_le32(pb); /* rate */ - size -= 6 * 4; - break; - case MKTAG('a', 'u', 'd', 's'): - codec_type = CODEC_TYPE_AUDIO; - /* nothing really useful */ - } - url_fskip(pb, size - 4); - break; - case MKTAG('s', 't', 'r', 'f'): - /* stream header */ - if (stream_index >= s->nb_streams) { - 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); - if (frame_period) - st->codec.frame_rate = (INT64_C(1000000) * FRAME_RATE_BASE) / frame_period; - else - st->codec.frame_rate = 25 * FRAME_RATE_BASE; - get_le16(pb); /* panes */ - get_le16(pb); /* depth */ - tag1 = get_le32(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 >= 18)); - 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]); - } - return -1; - } - - return 0; -} - -static int avi_read_packet(AVFormatContext *s, AVPacket *pkt) -{ - AVIContext *avi = s->priv_data; - ByteIOContext *pb = &s->pb; - int n, d1, d2, size; - - for(;;) { - if (url_feof(pb) || url_ftell(pb) >= avi->movi_end) - return -1; - d1 = get_byte(pb) - '0'; - d2 = get_byte(pb) - '0'; - if (d1 < 0 || d1 > 9 || d2 < 0 || d2 > 9) - continue; - - n = d1 * 10 + d2; - if (n < 0 || n >= s->nb_streams) - continue; - - d1 = get_byte(pb); - d2 = get_byte(pb); - if ((d1 == 'd' && d2 == 'c') - || (d1 == 'w' && d2 == 'b')) - break; - } - size = get_le32(pb); - av_new_packet(pkt, size); - pkt->stream_index = n; - - get_buffer(pb, pkt->data, pkt->size); - - if (size & 1) - get_byte(pb); - - 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; -} |