--- /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;
+}
projects / synfig.git / blobdiff