Initial revision

Originally committed as revision 5 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 956 insertions, 0 deletions

diff --git a/libav/asf.c b/libav/asf.c
new file mode 100644
index 0000000000..0306ed37c9
--- /dev/null
+++ b/libav/asf.c
@@ -0,0 +1,956 @@
+/*
+ * ASF compatible encoder and decoder.
+ * Copyright (c) 2000, 2001 Gerard Lantau.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+#include "avformat.h"
+#include "avi.h"
+
+#define PACKET_SIZE 3200
+#define PACKET_HEADER_SIZE 12
+#define FRAME_HEADER_SIZE 17
+
+typedef struct {
+    int num;
+    int seq;
+    /* use for reading */
+    AVPacket pkt;
+    int frag_offset;
+} ASFStream;
+
+typedef struct {
+    int seqno;
+    int packet_size;
+
+    ASFStream streams[2];
+    /* non streamed additonnal info */
+    int data_offset;
+    INT64 nb_packets;
+    INT64 duration; /* in 100ns units */
+    /* packet filling */
+    int packet_size_left;
+    int packet_timestamp_start;
+    int packet_timestamp_end;
+    int packet_nb_frames;
+    UINT8 packet_buf[PACKET_SIZE];
+    ByteIOContext pb;
+    /* only for reading */
+    int packet_padsize;
+} ASFContext;
+
+typedef struct {
+    UINT32 v1;
+    UINT16 v2;
+    UINT16 v3;
+    UINT8 v4[8];
+} GUID;
+
+static const GUID asf_header = {
+    0x75B22630, 0x668E, 0x11CF, { 0xA6, 0xD9, 0x00, 0xAA, 0x00, 0x62, 0xCE, 0x6C },
+};
+
+static const GUID file_header = {
+    0x8CABDCA1, 0xA947, 0x11CF, { 0x8E, 0xE4, 0x00, 0xC0, 0x0C, 0x20, 0x53, 0x65 },
+};
+
+static const GUID stream_header = {
+    0xB7DC0791, 0xA9B7, 0x11CF, { 0x8E, 0xE6, 0x00, 0xC0, 0x0C, 0x20, 0x53, 0x65 },
+};
+
+static const GUID audio_stream = {
+    0xF8699E40, 0x5B4D, 0x11CF, { 0xA8, 0xFD, 0x00, 0x80, 0x5F, 0x5C, 0x44, 0x2B },
+};
+
+static const GUID audio_conceal_none = {
+    0x49f1a440, 0x4ece, 0x11d0, { 0xa3, 0xac, 0x00, 0xa0, 0xc9, 0x03, 0x48, 0xf6 },
+};
+
+static const GUID video_stream = {
+    0xBC19EFC0, 0x5B4D, 0x11CF, { 0xA8, 0xFD, 0x00, 0x80, 0x5F, 0x5C, 0x44, 0x2B },
+};
+
+static const GUID video_conceal_none = {
+    0x20FB5700, 0x5B55, 0x11CF, { 0xA8, 0xFD, 0x00, 0x80, 0x5F, 0x5C, 0x44, 0x2B },
+};
+
+
+static const GUID comment_header = {
+    0x75b22633, 0x668e, 0x11cf, { 0xa6, 0xd9, 0x00, 0xaa, 0x00, 0x62, 0xce, 0x6c },
+};
+
+static const GUID codec_comment_header = {
+    0x86D15240, 0x311D, 0x11D0, { 0xA3, 0xA4, 0x00, 0xA0, 0xC9, 0x03, 0x48, 0xF6 },
+};
+static const GUID codec_comment1_header = {
+    0x86d15241, 0x311d, 0x11d0, { 0xa3, 0xa4, 0x00, 0xa0, 0xc9, 0x03, 0x48, 0xf6 },
+};
+
+static const GUID data_header = {
+    0x75b22636, 0x668e, 0x11cf, { 0xa6, 0xd9, 0x00, 0xaa, 0x00, 0x62, 0xce, 0x6c },
+};
+
+static const GUID index_guid = {
+    0x33000890, 0xe5b1, 0x11cf, { 0x89, 0xf4, 0x00, 0xa0, 0xc9, 0x03, 0x49, 0xcb },
+};
+
+static const GUID head1_guid = {
+    0x5fbf03b5, 0xa92e, 0x11cf, { 0x8e, 0xe3, 0x00, 0xc0, 0x0c, 0x20, 0x53, 0x65 },
+};
+
+static const GUID head2_guid = {
+    0xabd3d211, 0xa9ba, 0x11cf, { 0x8e, 0xe6, 0x00, 0xc0, 0x0c, 0x20, 0x53, 0x65 },
+};
+    
+/* I am not a number !!! This GUID is the one found on the PC used to
+   generate the stream */
+static const GUID my_guid = {
+    0, 0, 0, { 0, 0, 0, 0, 0, 0, 0, 0 },
+};
+
+static void put_guid(ByteIOContext *s, const GUID *g)
+{
+    int i;
+
+    put_le32(s, g->v1);
+    put_le16(s, g->v2);
+    put_le16(s, g->v3);
+    for(i=0;i<8;i++)
+        put_byte(s, g->v4[i]);
+}
+
+static void put_str16(ByteIOContext *s, const char *tag)
+{
+    int c;
+
+    put_le16(s,strlen(tag) + 1);
+    for(;;) {
+        c = (UINT8)*tag++;
+        put_le16(s, c);
+        if (c == '\0') 
+            break;
+    }
+}
+
+static void put_str16_nolen(ByteIOContext *s, const char *tag)
+{
+    int c;
+
+    for(;;) {
+        c = (UINT8)*tag++;
+        put_le16(s, c);
+        if (c == '\0') 
+            break;
+    }
+}
+
+static INT64 put_header(ByteIOContext *pb, const GUID *g)
+{
+    INT64 pos;
+
+    pos = url_ftell(pb);
+    put_guid(pb, g);
+    put_le64(pb, 24);
+    return pos;
+}
+
+/* update header size */
+static void end_header(ByteIOContext *pb, INT64 pos)
+{
+    INT64 pos1;
+
+    pos1 = url_ftell(pb);
+    url_fseek(pb, pos + 16, SEEK_SET);
+    put_le64(pb, pos1 - pos);
+    url_fseek(pb, pos1, SEEK_SET);
+}
+
+/* write an asf chunk (only used in streaming case) */
+static void put_chunk(AVFormatContext *s, int type, int payload_length)
+{
+    ASFContext *asf = s->priv_data;
+    ByteIOContext *pb = &s->pb;
+    int length;
+
+    length = payload_length + 8;
+    put_le16(pb, type); 
+    put_le16(pb, length); 
+    put_le32(pb, asf->seqno);
+    put_le16(pb, 0); /* unknown bytes */
+    put_le16(pb, length);
+    asf->seqno++;
+}
+
+/* convert from unix to windows time */
+static INT64 unix_to_file_time(int ti)
+{
+    INT64 t;
+    
+    t = ti * 10000000LL;
+    t += 116444736000000000LL;
+    return t;
+}
+
+/* write the header (used two times if non streamed) */
+static int asf_write_header1(AVFormatContext *s, INT64 file_size, INT64 data_chunk_size)
+{
+    ASFContext *asf = s->priv_data;
+    ByteIOContext *pb = &s->pb;
+    int header_size, n, extra_size, extra_size2, wav_extra_size, file_time;
+    int has_title;
+    AVCodecContext *enc;
+    INT64 header_offset, cur_pos, hpos;
+
+    has_title = (s->title[0] != '\0');
+
+    if (!url_is_streamed(&s->pb)) {
+        put_guid(pb, &asf_header);
+        put_le64(pb, 0); /* header length, will be patched after */
+        put_le32(pb, 3 + has_title + s->nb_streams); /* number of chunks in header */
+        put_byte(pb, 1); /* ??? */
+        put_byte(pb, 2); /* ??? */
+    } else {
+        put_chunk(s, 0x4824, 0); /* start of stream (length will be patched later) */
+    }
+    
+    /* file header */
+    header_offset = url_ftell(pb);
+    hpos = put_header(pb, &file_header);
+    put_guid(pb, &my_guid);
+    put_le64(pb, file_size);
+    file_time = 0;
+    put_le64(pb, unix_to_file_time(file_time));
+    put_le64(pb, asf->nb_packets); /* number of packets */
+    put_le64(pb, asf->duration); /* end time stamp (in 100ns units) */
+    put_le64(pb, asf->duration); /* duration (in 100ns units) */
+    put_le32(pb, 0); /* start time stamp */ 
+    put_le32(pb, 0); /* ??? */ 
+    put_le32(pb, 0); /* ??? */ 
+    put_le32(pb, asf->packet_size); /* packet size */
+    put_le32(pb, asf->packet_size); /* packet size */
+    put_le32(pb, 80 * asf->packet_size); /* frame_size ??? */
+    end_header(pb, hpos);
+
+    /* unknown headers */
+    hpos = put_header(pb, &head1_guid);
+    put_guid(pb, &head2_guid);
+    put_le32(pb, 6);
+    put_le16(pb, 0);
+    end_header(pb, hpos);
+
+    /* title and other infos */
+    if (has_title) {
+        hpos = put_header(pb, &comment_header);
+        put_le16(pb, 2 * (strlen(s->title) + 1));
+        put_le16(pb, 2 * (strlen(s->author) + 1));
+        put_le16(pb, 2 * (strlen(s->copyright) + 1));
+        put_le16(pb, 2 * (strlen(s->comment) + 1));
+        put_le16(pb, 0);
+        put_str16_nolen(pb, s->title);
+        put_str16_nolen(pb, s->author);
+        put_str16_nolen(pb, s->copyright);
+        put_str16_nolen(pb, s->comment);
+        end_header(pb, hpos);
+    }
+
+    /* stream headers */
+    for(n=0;n<s->nb_streams;n++) {
+        enc = &s->streams[n]->codec;
+        asf->streams[n].num = n + 1;
+        asf->streams[n].seq = 0;
+        
+        switch(enc->codec_type) {
+        case CODEC_TYPE_AUDIO:
+            wav_extra_size = 0;
+            extra_size = 18 + wav_extra_size;
+            extra_size2 = 0;
+            break;
+        default:
+        case CODEC_TYPE_VIDEO:
+            wav_extra_size = 0;
+            extra_size = 0x33;
+            extra_size2 = 0;
+            break;
+        }
+
+        hpos = put_header(pb, &stream_header);
+        if (enc->codec_type == CODEC_TYPE_AUDIO) {
+            put_guid(pb, &audio_stream);
+            put_guid(pb, &audio_conceal_none);
+        } else {
+            put_guid(pb, &video_stream);
+            put_guid(pb, &video_conceal_none);
+        }
+        put_le64(pb, 0); /* ??? */
+        put_le32(pb, extra_size); /* wav header len */
+        put_le32(pb, extra_size2); /* additional data len */
+        put_le16(pb, n + 1); /* stream number */
+        put_le32(pb, 0); /* ??? */
+        
+        if (enc->codec_type == CODEC_TYPE_AUDIO) {
+            /* WAVEFORMATEX header */
+            put_wav_header(pb, enc);
+        } else {
+            put_le32(pb, enc->width);
+            put_le32(pb, enc->height);
+            put_byte(pb, 2); /* ??? */
+            put_le16(pb, 40); /* size */
+
+            /* BITMAPINFOHEADER header */
+            put_bmp_header(pb, enc);
+        }
+        end_header(pb, hpos);
+    }
+
+    /* media comments */
+
+    hpos = put_header(pb, &codec_comment_header);
+    put_guid(pb, &codec_comment1_header);
+    put_le32(pb, s->nb_streams);
+    for(n=0;n<s->nb_streams;n++) {
+        enc = &s->streams[n]->codec;
+
+        put_le16(pb, asf->streams[n].num);
+        put_str16(pb, enc->codec_name);
+        put_le16(pb, 0); /* no parameters */
+        /* id */
+        if (enc->codec_type == CODEC_TYPE_AUDIO) {
+            put_le16(pb, 2);
+            put_le16(pb, codec_get_tag(codec_wav_tags, enc->codec_id));
+        } else {
+            put_le16(pb, 4);
+            put_le32(pb, codec_get_tag(codec_bmp_tags, enc->codec_id));
+        }
+    }
+    end_header(pb, hpos);
+
+    /* patch the header size fields */
+
+    cur_pos = url_ftell(pb);
+    header_size = cur_pos - header_offset;
+    if (!url_is_streamed(&s->pb)) {
+        header_size += 24 + 6;
+        url_fseek(pb, header_offset - 14, SEEK_SET);
+        put_le64(pb, header_size);
+    } else {
+        header_size += 8 + 50;
+        url_fseek(pb, header_offset - 10, SEEK_SET);
+        put_le16(pb, header_size);
+        url_fseek(pb, header_offset - 2, SEEK_SET);
+        put_le16(pb, header_size);
+    }
+    url_fseek(pb, cur_pos, SEEK_SET);
+
+    /* movie chunk, followed by packets of packet_size */
+    asf->data_offset = cur_pos;
+    put_guid(pb, &data_header);
+    put_le64(pb, data_chunk_size);
+    put_guid(pb, &my_guid);
+    put_le64(pb, asf->nb_packets); /* nb packets */
+    put_byte(pb, 1); /* ??? */
+    put_byte(pb, 1); /* ??? */
+    return 0;
+}
+
+static int asf_write_header(AVFormatContext *s)
+{
+    ASFContext *asf;
+
+    asf = av_mallocz(sizeof(ASFContext));
+    if (!asf)
+        return -1;
+    s->priv_data = asf;
+
+    asf->packet_size = PACKET_SIZE;
+    asf->nb_packets = 0;
+
+    asf_write_header1(s, 0, 24);
+
+    put_flush_packet(&s->pb);
+
+    asf->packet_nb_frames = 0;
+    asf->packet_timestamp_start = -1;
+    asf->packet_timestamp_end = -1;
+    asf->packet_size_left = asf->packet_size - PACKET_HEADER_SIZE;
+    init_put_byte(&asf->pb, asf->packet_buf, asf->packet_size, 1,
+                  NULL, NULL, NULL, NULL);
+
+    return 0;
+}
+
+/* write a fixed size packet */
+static void put_packet(AVFormatContext *s, 
+                       unsigned int timestamp, unsigned int duration, 
+                       int nb_frames, int padsize)
+{
+    ASFContext *asf = s->priv_data;
+    ByteIOContext *pb = &s->pb;
+    int flags;
+
+    if (url_is_streamed(&s->pb)) {
+        put_chunk(s, 0x4424, asf->packet_size);
+    }
+
+    put_byte(pb, 0x82);
+    put_le16(pb, 0);
+    
+    flags = 0x01; /* nb segments present */
+    if (padsize > 0) {
+        if (padsize < 256)
+            flags |= 0x08;
+        else
+            flags |= 0x10;
+    }
+    put_byte(pb, flags); /* flags */
+    put_byte(pb, 0x5d);
+    if (flags & 0x10)
+        put_le16(pb, padsize);
+    if (flags & 0x08)
+        put_byte(pb, padsize);
+    put_le32(pb, timestamp);
+    put_le16(pb, duration);
+    put_byte(pb, nb_frames | 0x80);
+}
+
+static void flush_packet(AVFormatContext *s)
+{
+    ASFContext *asf = s->priv_data;
+    int hdr_size, ptr;
+    
+    put_packet(s, asf->packet_timestamp_start, 
+               asf->packet_timestamp_end - asf->packet_timestamp_start, 
+               asf->packet_nb_frames, asf->packet_size_left);
+    
+    /* compute padding */
+    hdr_size = PACKET_HEADER_SIZE;
+    if (asf->packet_size_left > 0) {
+        /* if padding needed, don't forget to count the
+           padding byte in the header size */
+        hdr_size++;
+        asf->packet_size_left--;
+        /* XXX: I do not test again exact limit to avoid boundary problems */
+        if (asf->packet_size_left > 200) {
+            hdr_size++;
+            asf->packet_size_left--;
+        }
+    }
+    ptr = asf->packet_size - PACKET_HEADER_SIZE - asf->packet_size_left;
+    memset(asf->packet_buf + ptr, 0, asf->packet_size_left);
+    
+    put_buffer(&s->pb, asf->packet_buf, asf->packet_size - hdr_size);
+    
+    put_flush_packet(&s->pb);
+    asf->nb_packets++;
+    asf->packet_nb_frames = 0;
+    asf->packet_timestamp_start = -1;
+    asf->packet_timestamp_end = -1;
+    asf->packet_size_left = asf->packet_size - PACKET_HEADER_SIZE;
+    init_put_byte(&asf->pb, asf->packet_buf, asf->packet_size, 1,
+                  NULL, NULL, NULL, NULL);
+}
+
+static void put_frame_header(AVFormatContext *s, ASFStream *stream, int timestamp,
+                             int payload_size, int frag_offset, int frag_len)
+{
+    ASFContext *asf = s->priv_data;
+    ByteIOContext *pb = &asf->pb;
+    int val;
+
+    val = stream->num;
+    if (s->streams[val - 1]->codec.key_frame)
+        val |= 0x80;
+    put_byte(pb, val);
+    put_byte(pb, stream->seq);
+    put_le32(pb, frag_offset); /* fragment offset */
+    put_byte(pb, 0x08); /* flags */
+    put_le32(pb, payload_size);
+    put_le32(pb, timestamp);
+    put_le16(pb, frag_len);
+}
+
+
+/* Output a frame. We suppose that payload_size <= PACKET_SIZE.
+
+   It is there that you understand that the ASF format is really
+   crap. They have misread the MPEG Systems spec ! 
+ */
+static void put_frame(AVFormatContext *s, ASFStream *stream, int timestamp,
+                      UINT8 *buf, int payload_size)
+{
+    ASFContext *asf = s->priv_data;
+    int frag_pos, frag_len, frag_len1;
+    
+    frag_pos = 0;
+    while (frag_pos < payload_size) {
+        frag_len = payload_size - frag_pos;
+        frag_len1 = asf->packet_size_left - FRAME_HEADER_SIZE;
+        if (frag_len1 > 0) {
+            if (frag_len > frag_len1)
+                frag_len = frag_len1;
+            put_frame_header(s, stream, timestamp, payload_size, frag_pos, frag_len);
+            put_buffer(&asf->pb, buf, frag_len);
+            asf->packet_size_left -= (frag_len + FRAME_HEADER_SIZE);
+            asf->packet_timestamp_end = timestamp;
+            if (asf->packet_timestamp_start == -1)
+                asf->packet_timestamp_start = timestamp;
+            asf->packet_nb_frames++;
+        } else {
+            frag_len = 0;
+        }
+        frag_pos += frag_len;
+        buf += frag_len;
+        /* output the frame if filled */
+        if (asf->packet_size_left <= FRAME_HEADER_SIZE)
+            flush_packet(s);
+    }
+    stream->seq++;
+}
+
+
+static int asf_write_packet(AVFormatContext *s, int stream_index,
+                            UINT8 *buf, int size)
+{
+    ASFContext *asf = s->priv_data;
+    int timestamp;
+    INT64 duration;
+    AVCodecContext *codec;
+
+    codec = &s->streams[stream_index]->codec;
+    if (codec->codec_type == CODEC_TYPE_AUDIO) {
+        timestamp = (int)((float)codec->frame_number * codec->frame_size * 1000.0 / 
+                          codec->sample_rate);
+        duration = (codec->frame_number * codec->frame_size * 10000000LL) / 
+            codec->sample_rate;
+    } else {
+        timestamp = (int)((float)codec->frame_number * 1000.0 * FRAME_RATE_BASE / 
+                          codec->frame_rate);
+        duration = codec->frame_number * 
+            ((10000000LL * FRAME_RATE_BASE) / codec->frame_rate);
+    }
+    if (duration > asf->duration)
+        asf->duration = duration;
+    
+    put_frame(s, &asf->streams[stream_index], (int)timestamp, buf, size);
+    return 0;
+}
+    
+static int asf_write_trailer(AVFormatContext *s)
+{
+    ASFContext *asf = s->priv_data;
+    long long file_size;
+
+    /* flush the current packet */
+    if (asf->pb.buf_ptr > asf->pb.buffer)
+        flush_packet(s);
+
+    if (url_is_streamed(&s->pb)) {
+        put_chunk(s, 0x4524, 0); /* end of stream */
+    } else {
+        /* rewrite an updated header */
+        file_size = url_ftell(&s->pb);
+        url_fseek(&s->pb, 0, SEEK_SET);
+        asf_write_header1(s, file_size, file_size - asf->data_offset);
+    }
+
+    put_flush_packet(&s->pb);
+
+    free(asf);
+    return 0;
+}
+
+/**********************************/
+/* decoding */
+
+//#define DEBUG
+
+#ifdef DEBUG
+static void print_guid(const GUID *g)
+{
+    int i;
+    printf("0x%08x, 0x%04x, 0x%04x, {", g->v1, g->v2, g->v3);
+    for(i=0;i<8;i++) 
+        printf(" 0x%02x,", g->v4[i]);
+    printf("}\n");
+}
+#endif
+
+static void get_guid(ByteIOContext *s, GUID *g)
+{
+    int i;
+
+    g->v1 = get_le32(s);
+    g->v2 = get_le16(s);
+    g->v3 = get_le16(s);
+    for(i=0;i<8;i++)
+        g->v4[i] = get_byte(s);
+}
+
+#if 0
+static void get_str16(ByteIOContext *pb, char *buf, int buf_size)
+{
+    int len, c;
+    char *q;
+
+    len = get_le16(pb);
+    q = buf;
+    while (len > 0) {
+        c = get_le16(pb);
+        if ((q - buf) < buf_size - 1)
+            *q++ = c;
+        len--;
+    }
+    *q = '\0';
+}
+#endif
+
+static void get_str16_nolen(ByteIOContext *pb, int len, char *buf, int buf_size)
+{
+    int c;
+    char *q;
+
+    q = buf;
+    while (len > 0) {
+        c = get_le16(pb);
+        if ((q - buf) < buf_size - 1)
+            *q++ = c;
+        len-=2;
+    }
+    *q = '\0';
+}
+
+static int asf_read_header(AVFormatContext *s, AVFormatParameters *ap)
+{
+    ASFContext *asf;
+    GUID g;
+    ByteIOContext *pb = &s->pb;
+    AVStream *st;
+    ASFStream *asf_st;
+    int size, i;
+    INT64 gsize;
+
+    asf = av_mallocz(sizeof(ASFContext));
+    if (!asf)
+        return -1;
+    s->priv_data = asf;
+
+    get_guid(pb, &g);
+    if (memcmp(&g, &asf_header, sizeof(GUID)))
+        goto fail;
+    get_le64(pb);
+    get_le32(pb);
+    get_byte(pb);
+    get_byte(pb);
+
+    for(;;) {
+        get_guid(pb, &g);
+        gsize = get_le64(pb);
+#ifdef DEBUG
+        printf("%08Lx: ", url_ftell(pb) - 24);
+        print_guid(&g);
+        printf("  size=0x%Lx\n", gsize);
+#endif
+        if (gsize < 24)
+            goto fail;
+        if (!memcmp(&g, &file_header, sizeof(GUID))) {
+            get_guid(pb, &g);
+            get_le64(pb); /* file size */
+            get_le64(pb); /* file time */
+            get_le64(pb); /* nb_packets */
+            get_le64(pb); /* length 0 in us */
+            get_le64(pb); /* length 1 in us */
+            get_le32(pb);
+            get_le32(pb);
+            get_le32(pb);
+            asf->packet_size = get_le32(pb);
+            get_le32(pb);
+            get_le32(pb);
+        } else if (!memcmp(&g, &stream_header, sizeof(GUID))) {
+            int type, id, total_size;
+            unsigned int tag1;
+            INT64 pos1, pos2;
+            
+            pos1 = url_ftell(pb);
+
+            st = av_mallocz(sizeof(AVStream));
+            if (!st)
+                goto fail;
+            s->streams[s->nb_streams++] = st;
+            asf_st = av_mallocz(sizeof(ASFStream));
+            if (!asf_st)
+                goto fail;
+            st->priv_data = asf_st;
+
+            get_guid(pb, &g);
+            if (!memcmp(&g, &audio_stream, sizeof(GUID))) {
+                type = CODEC_TYPE_AUDIO;
+            } else if (!memcmp(&g, &video_stream, sizeof(GUID))) {
+                type = CODEC_TYPE_VIDEO;
+            } else {
+                goto fail;
+            }
+            get_guid(pb, &g);
+            total_size = get_le64(pb);
+            get_le32(pb);
+            get_le32(pb);
+            st->id = get_le16(pb); /* stream id */
+            get_le32(pb);
+            st->codec.codec_type = type;
+            if (type == CODEC_TYPE_AUDIO) {
+                id = get_le16(pb); 
+                st->codec.codec_tag = id;
+                st->codec.codec_id = codec_get_id(codec_wav_tags, id);
+                st->codec.channels = get_le16(pb);
+                st->codec.sample_rate = get_le32(pb);
+                st->codec.bit_rate = get_le32(pb) * 8;
+                get_le16(pb); /* block align */
+                get_le16(pb); /* bits per sample */
+                size = get_le16(pb); 
+                url_fskip(pb, size);
+            } else {
+                get_le32(pb);
+                get_le32(pb);
+                get_byte(pb);
+                size = get_le16(pb); /* size */
+                get_le32(pb); /* size */
+                st->codec.width = get_le32(pb);
+                st->codec.height = get_le32(pb);
+                st->codec.frame_rate = 25 * FRAME_RATE_BASE; /* XXX: find it */
+                get_le16(pb); /* panes */
+                get_le16(pb); /* depth */
+                tag1 = get_le32(pb);
+                st->codec.codec_tag = tag1;
+                st->codec.codec_id = codec_get_id(codec_bmp_tags, tag1);
+                url_fskip(pb, size - 5 * 4);
+            }
+            pos2 = url_ftell(pb);
+            url_fskip(pb, gsize - (pos2 - pos1 + 24));
+        } else if (!memcmp(&g, &data_header, sizeof(GUID))) {
+            break;
+        } else if (!memcmp(&g, &comment_header, sizeof(GUID))) {
+            int len1, len2, len3, len4, len5;
+
+            len1 = get_le16(pb);
+            len2 = get_le16(pb);
+            len3 = get_le16(pb);
+            len4 = get_le16(pb);
+            len5 = get_le16(pb);
+            get_str16_nolen(pb, len1, s->title, sizeof(s->title));
+            get_str16_nolen(pb, len2, s->author, sizeof(s->author));
+            get_str16_nolen(pb, len3, s->copyright, sizeof(s->copyright));
+            get_str16_nolen(pb, len4, s->comment, sizeof(s->comment));
+            url_fskip(pb, len5);
+#if 0
+        } else if (!memcmp(&g, &head1_guid, sizeof(GUID))) {
+            int v1, v2;
+            get_guid(pb, &g);
+            v1 = get_le32(pb);
+            v2 = get_le16(pb);
+        } else if (!memcmp(&g, &codec_comment_header, sizeof(GUID))) {
+            int len, v1, n, num;
+            char str[256], *q;
+            char tag[16];
+
+            get_guid(pb, &g);
+            print_guid(&g);
+            
+            n = get_le32(pb);
+            for(i=0;i<n;i++) {
+                num = get_le16(pb); /* stream number */
+                get_str16(pb, str, sizeof(str));
+                get_str16(pb, str, sizeof(str));
+                len = get_le16(pb);
+                q = tag;
+                while (len > 0) {
+                    v1 = get_byte(pb);
+                    if ((q - tag) < sizeof(tag) - 1)
+                        *q++ = v1;
+                    len--;
+                }
+                *q = '\0';
+            }
+#endif
+        } else if (url_feof(pb)) {
+            goto fail;
+        } else {
+            url_fseek(pb, gsize - 24, SEEK_CUR);
+        }
+    }
+    get_guid(pb, &g);
+    get_le64(pb);
+    get_byte(pb);
+    get_byte(pb);
+
+    asf->packet_size_left = 0;
+
+    return 0;
+
+ fail:
+    for(i=0;i<s->nb_streams;i++) {
+        AVStream *st = s->streams[i];
+        if (st)
+            free(st->priv_data);
+        free(st);
+    }
+    free(asf);
+    return -1;
+}
+
+static int asf_get_packet(AVFormatContext *s)
+{
+    ASFContext *asf = s->priv_data;
+    ByteIOContext *pb = &s->pb;
+    int c, flags, timestamp, hdr_size;
+
+    hdr_size = 12;
+    c = get_byte(pb);
+    if (c != 0x82)
+        return -EIO;
+    get_le16(pb);
+    flags = get_byte(pb);
+    get_byte(pb);
+    asf->packet_padsize = 0;
+    if (flags & 0x10) {
+        asf->packet_padsize = get_le16(pb);
+        hdr_size += 2;
+    } else if (flags & 0x08) {
+        asf->packet_padsize = get_byte(pb);
+        hdr_size++;
+    }
+    timestamp = get_le32(pb);
+    get_le16(pb); /* duration */
+    get_byte(pb); /* nb_frames */
+#ifdef DEBUG
+    printf("packet: size=%d padsize=%d\n", asf->packet_size, asf->packet_padsize);
+#endif
+    asf->packet_size_left = asf->packet_size - hdr_size;
+    return 0;
+}
+
+static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
+{
+    ASFContext *asf = s->priv_data;
+    AVStream *st;
+    ASFStream *asf_st;
+    ByteIOContext *pb = &s->pb;
+    int ret, num, seq, frag_offset, payload_size, frag_len;
+    int timestamp, i;
+
+    for(;;) {
+        if (asf->packet_size_left < FRAME_HEADER_SIZE ||
+            asf->packet_size_left <= asf->packet_padsize) {
+            /* fail safe */
+            if (asf->packet_size_left)
+                url_fskip(pb, asf->packet_size_left);
+            ret = asf_get_packet(s);
+            if (ret < 0)
+                return -EIO;
+        }
+        /* read frame header */
+        num = get_byte(pb) & 0x7f;
+        seq = get_byte(pb);
+        frag_offset = get_le32(pb);
+        get_byte(pb); /* flags */
+        payload_size = get_le32(pb);
+        timestamp = get_le32(pb);
+        frag_len = get_le16(pb);
+#ifdef DEBUG
+        printf("num=%d seq=%d totsize=%d frag_off=%d frag_size=%d\n",
+               num, seq, payload_size, frag_offset, frag_len);
+#endif
+        st = NULL;
+        for(i=0;i<s->nb_streams;i++) {
+            st = s->streams[i];
+            if (st->id == num)
+                break;
+        }
+        asf->packet_size_left -= FRAME_HEADER_SIZE + frag_len;
+        if (i == s->nb_streams) {
+            /* unhandled packet (should not happen) */
+            url_fskip(pb, frag_len);
+        } else {
+            asf_st = st->priv_data;
+            if (asf_st->frag_offset == 0) {
+                /* new packet */
+                av_new_packet(&asf_st->pkt, payload_size);
+                asf_st->seq = seq;
+            } else {
+                if (seq == asf_st->seq && 
+                    frag_offset == asf_st->frag_offset) {
+                    /* continuing packet */
+                } else {
+                    /* cannot continue current packet: free it */
+                    av_free_packet(&asf_st->pkt);
+                    asf_st->frag_offset = 0;
+                    if (frag_offset != 0) {
+                        /* cannot create new packet */
+                        url_fskip(pb, frag_len);
+                        goto next_frame;
+                    } else {
+                        /* create new packet */
+                        av_new_packet(&asf_st->pkt, payload_size);
+                        asf_st->seq = seq;
+                    }
+                }
+            }
+            /* read data */
+            get_buffer(pb, asf_st->pkt.data + frag_offset, frag_len);
+            asf_st->frag_offset += frag_len;
+            /* test if whole packet read */
+            if (asf_st->frag_offset == asf_st->pkt.size) {
+                /* return packet */
+                asf_st->pkt.stream_index = i;
+                asf_st->frag_offset = 0;
+                memcpy(pkt, &asf_st->pkt, sizeof(AVPacket)); 
+                break;
+            }
+        }
+    next_frame:
+    }
+
+    return 0;
+}
+
+static int asf_read_close(AVFormatContext *s)
+{
+    ASFContext *asf = s->priv_data;
+    int i;
+
+    for(i=0;i<s->nb_streams;i++) {
+        AVStream *st = s->streams[i];
+            free(st->priv_data);
+    }
+    free(asf);
+    return 0;
+}
+
+AVFormat asf_format = {
+    "asf",
+    "asf format",
+    "application/octet-stream",
+    "asf",
+    CODEC_ID_MP2,
+    CODEC_ID_MSMPEG4,
+    asf_write_header,
+    asf_write_packet,
+    asf_write_trailer,
+
+    asf_read_header,
+    asf_read_packet,
+    asf_read_close,
+};