+++ /dev/null
-/*
- * 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, nb_frames;
- int i, n;
- AVStream *st;
- int xan_video = 0; /* hack to support Xan A/V */
-
- 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);
- n = get_le32(pb);
- for(i=0;i<n;i++) {
- st = av_new_stream(s, 0);
- if (!st)
- goto fail;
- }
- 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;
- }
- get_le32(pb); /* start */
- nb_frames = get_le32(pb);
- st->start_time = 0;
- st->duration = (double)nb_frames *
- st->codec.frame_rate_base * AV_TIME_BASE /
- st->codec.frame_rate;
-
- if (avi->type == 1) {
- AVStream *st;
-
- st = av_new_stream(s, 0);
- if (!st)
- goto fail;
-
- 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 - 9 * 4);
- break;
- case MKTAG('a', 'u', 'd', 's'):
- {
- unsigned int length, rate;
-
- codec_type = CODEC_TYPE_AUDIO;
-
- if (stream_index >= s->nb_streams) {
- url_fskip(pb, size - 4);
- break;
- }
- st = s->streams[stream_index];
-
- get_le32(pb); /* tag */
- get_le32(pb); /* flags */
- get_le16(pb); /* priority */
- get_le16(pb); /* language */
- get_le32(pb); /* initial frame */
- get_le32(pb); /* scale */
- rate = get_le32(pb);
- get_le32(pb); /* start */
- length = get_le32(pb); /* length, in samples or bytes */
- st->start_time = 0;
- if (rate != 0)
- st->duration = (int64_t)length * AV_TIME_BASE / rate;
- url_fskip(pb, size - 9 * 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);
- 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);
- if (st->codec.codec_id == CODEC_ID_XAN_WC4)
- xan_video = 1;
-// 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);
- /* special case time: To support Xan DPCM, hardcode
- * the format if Xxan is the video codec */
- if (xan_video)
- st->codec.codec_id = CODEC_ID_XAN_DPCM;
- 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:
- av_free(avi->buf);
- 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) {
- /* duplicate DV packet */
- 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;
- }
-
- 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) {
-
- if (avi->type == 1) {
- uint8_t *tbuf = av_realloc(avi->buf, size + FF_INPUT_BUFFER_PADDING_SIZE);
- if (!tbuf)
- return -1;
- avi->buf = tbuf;
- avi->buf_size = size;
- av_init_packet(pkt);
- pkt->data = avi->buf;
- pkt->size = avi->buf_size;
- pkt->destruct = __destruct_pkt;
- avi->stream_index = n;
- } else {
- av_new_packet(pkt, size);
- }
- get_buffer(pb, pkt->data, size);
- if (size & 1)
- get_byte(pb);
- pkt->stream_index = n;
- pkt->flags |= PKT_FLAG_KEY; // FIXME: We really should read index for that
- return 0;
- }
- }
- return -1;
-}
-
-static int avi_read_close(AVFormatContext *s)
-{
- int i;
- AVIContext *avi = s->priv_data;
- av_free(avi->buf);
-
- for(i=0;i<s->nb_streams;i++) {
- AVStream *st = s->streams[i];
-// av_free(st->priv_data);
- av_free(st->codec.extradata);
- }
-
- 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;
-}
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