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-rw-r--r--asfenc.c510
1 files changed, 510 insertions, 0 deletions
diff --git a/asfenc.c b/asfenc.c
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index 0000000000..5b2892309f
--- /dev/null
+++ b/asfenc.c
@@ -0,0 +1,510 @@
+/*
+ * ASF compatible encoder
+ * Copyright (c) 2000 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 <netinet/in.h>
+#include <string.h>
+#include "mpegenc.h"
+
+#define PACKET_SIZE 3200
+#define PACKET_HEADER_SIZE 12
+#define FRAME_HEADER_SIZE 17
+
+typedef struct {
+ AVEncodeContext *enc;
+ int num;
+ int seq;
+} ASFStream;
+
+typedef struct {
+ int is_streamed; /* true if streamed */
+ int seqno;
+ int packet_size;
+
+ ASFStream streams[2];
+ ASFStream *audio_stream, *video_stream;
+ int nb_streams;
+ /* non streamed additonnal info */
+ int file_size_offset;
+ int data_offset;
+ /* packet filling */
+ int packet_size_left;
+ int packet_timestamp_start;
+ int packet_timestamp_end;
+ int packet_nb_frames;
+ UINT8 packet_buf[PACKET_SIZE];
+ PutByteContext pb;
+} 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 = {
+ 0x86D15240, 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 packet_guid = {
+ 0xF656CCE1, 0x03B3, 0x11D4, { 0xBE, 0xA2, 0x00, 0xA0, 0xCC, 0x3D, 0x72, 0x74 },
+};
+
+/* I am not a number !!! This GUID is the one found on the PC used to
+ generate the stream */
+static const GUID my_guid = {
+ 0x12345678, 0xA947, 0x11CF, { 0x31, 0x41, 0x59, 0x26, 0x20, 0x20, 0x20, 0x20 },
+};
+
+static void put_guid(PutByteContext *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]);
+}
+
+#if 0
+static void put_str16(PutByteContext *s, const char *tag)
+{
+ put_le16(s,strlen(tag));
+ while (*tag) {
+ put_le16(s, *tag++);
+ }
+}
+#endif
+
+/* 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;
+ PutByteContext *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++;
+}
+
+
+static int asf_write_header(AVFormatContext *s)
+{
+ PutByteContext *pb = &s->pb;
+ ASFContext *asf;
+ int header_size, n, extra_size, extra_size2, i, wav_extra_size;
+ AVEncodeContext *enc;
+ long long header_offset, cur_pos;
+
+ asf = malloc(sizeof(ASFContext));
+ if (!asf)
+ return -1;
+ memset(asf, 0, sizeof(ASFContext));
+ s->priv_data = asf;
+
+ asf->packet_size = PACKET_SIZE;
+
+ if (!s->is_streamed) {
+ put_guid(pb, &asf_header);
+ put_le64(pb, 0); /* header length, will be patched after */
+ put_le32(pb, 6); /* ??? */
+ 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 = put_pos(pb);
+ put_guid(pb, &file_header);
+ put_le64(pb, 24 + 80);
+ put_guid(pb, &my_guid);
+ asf->file_size_offset = put_pos(pb);
+ put_le64(pb, 0); /* file size (patched after if not streamed) */
+ put_le64(pb, 0); /* file time : 1601 :-) */
+ put_le64(pb, 0x283); /* ??? */
+ put_le64(pb, 0); /* stream 0 length in us */
+ put_le64(pb, 0); /* stream 1 length in us */
+ put_le32(pb, 0x0c1c); /* ??? */
+ put_le32(pb, 0); /* ??? */
+ put_le32(pb, 2); /* ??? */
+ put_le32(pb, asf->packet_size); /* packet size */
+ put_le32(pb, asf->packet_size); /* ??? */
+ put_le32(pb, 0x03e800); /* ??? */
+
+ /* stream headers */
+ n = 0;
+ for(i=0;i<2;i++) {
+ if (i == 0)
+ enc = s->audio_enc;
+ else
+ enc = s->video_enc;
+
+ if (!enc)
+ continue;
+ asf->streams[n].num = i;
+ asf->streams[n].seq = 0;
+ asf->streams[n].enc = enc;
+
+ switch(enc->codec->type) {
+ case CODEC_TYPE_AUDIO:
+ asf->audio_stream = &asf->streams[n];
+ wav_extra_size = 0;
+ extra_size = 18 + wav_extra_size;
+ extra_size2 = 0;
+ break;
+ default:
+ case CODEC_TYPE_VIDEO:
+ asf->video_stream = &asf->streams[n];
+ wav_extra_size = 0;
+ extra_size = 0x33;
+ extra_size2 = 0;
+ break;
+ }
+
+ put_guid(pb, &stream_header);
+ put_le64(pb, 24 + 16 * 2 + 22 + extra_size + extra_size2);
+ 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_le16(pb, 0x55); /* MP3 format */
+ put_le16(pb, s->audio_enc->channels);
+ put_le32(pb, s->audio_enc->rate);
+ put_le32(pb, s->audio_enc->bit_rate / 8);
+ put_le16(pb, 1); /* block align */
+ put_le16(pb, 16); /* bits per sample */
+ put_le16(pb, wav_extra_size);
+
+ /* no addtionnal adata */
+ } else {
+ put_le32(pb, enc->width);
+ put_le32(pb, enc->height);
+ put_byte(pb, 2); /* ??? */
+ put_le16(pb, 40); /* size */
+
+ /* BITMAPINFOHEADER header */
+ put_le32(pb, 40); /* size */
+ put_le32(pb, enc->width);
+ put_le32(pb, enc->height);
+ put_le16(pb, 1); /* planes */
+ put_le16(pb, 24); /* depth */
+ /* compression type */
+ switch(enc->codec->id) {
+ case CODEC_ID_H263:
+ put_tag(pb, "I263");
+ break;
+ case CODEC_ID_MJPEG:
+ put_tag(pb, "MJPG");
+ break;
+ default:
+ put_tag(pb, "XXXX");
+ break;
+ }
+ put_le32(pb, enc->width * enc->height * 3);
+ put_le32(pb, 0);
+ put_le32(pb, 0);
+ put_le32(pb, 0);
+ put_le32(pb, 0);
+ }
+ n++;
+ }
+ asf->nb_streams = n;
+
+ /* XXX: should media comments */
+#if 0
+ put_guid(pb, &comment_header);
+ put_le64(pb, 0);
+#endif
+ /* patch the header size fields */
+ cur_pos = put_pos(pb);
+ header_size = cur_pos - header_offset;
+ if (!s->is_streamed) {
+ header_size += 24 + 6;
+ put_seek(pb, header_offset - 14, SEEK_SET);
+ put_le64(pb, header_size);
+ } else {
+ header_size += 8 + 50;
+ put_seek(pb, header_offset - 10, SEEK_SET);
+ put_le16(pb, header_size);
+ put_seek(pb, header_offset - 2, SEEK_SET);
+ put_le16(pb, header_size);
+ }
+ put_seek(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, 24); /* will be patched after */
+ put_guid(pb, &packet_guid);
+ put_le64(pb, 0x283); /* ??? */
+ put_byte(pb, 1); /* ??? */
+ put_byte(pb, 1); /* ??? */
+
+ 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,
+ 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;
+ PutByteContext *pb = &s->pb;
+ int flags;
+
+ if (s->is_streamed) {
+ 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->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,
+ 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;
+ PutByteContext *pb = &asf->pb;
+ int val;
+
+ val = stream->num;
+ if (stream->enc->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_audio(AVFormatContext *s, UINT8 *buf, int size)
+{
+ ASFContext *asf = s->priv_data;
+ int timestamp;
+
+ timestamp = (int)((float)s->audio_enc->frame_number * s->audio_enc->frame_size * 1000.0 /
+ s->audio_enc->rate);
+ put_frame(s, asf->audio_stream, timestamp, buf, size);
+ return 0;
+}
+
+static int asf_write_video(AVFormatContext *s, UINT8 *buf, int size)
+{
+ ASFContext *asf = s->priv_data;
+ int timestamp;
+
+ timestamp = (int)((float)s->video_enc->frame_number * 1000.0 /
+ s->video_enc->rate);
+ put_frame(s, asf->audio_stream, 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 (s->is_streamed) {
+ put_chunk(s, 0x4524, 0); /* end of stream */
+ } else {
+ /* patch the various place which depends on the file size */
+ file_size = put_pos(&s->pb);
+ put_seek(&s->pb, asf->file_size_offset, SEEK_SET);
+ put_le64(&s->pb, file_size);
+ put_seek(&s->pb, asf->data_offset + 16, SEEK_SET);
+ put_le64(&s->pb, file_size - asf->data_offset);
+ }
+
+ put_flush_packet(&s->pb);
+
+ free(asf);
+ return 0;
+}
+
+AVFormat asf_format = {
+ "asf",
+ "asf format",
+ "application/octet-stream",
+ "asf",
+ CODEC_ID_MP2,
+ CODEC_ID_MJPEG,
+ asf_write_header,
+ asf_write_audio,
+ asf_write_video,
+ asf_write_trailer,
+};