www.pudn.com > ffmpeg-0.3.4.rar > avienc.c
/*
* AVI 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
#include
#include
#include
#include "mpegenc.h"
typedef long long offset_t;
typedef struct AVIIndex {
unsigned char tag[4];
unsigned int flags, pos, len;
struct AVIIndex *next;
} AVIIndex;
typedef struct {
offset_t movi_list;
AVIIndex *first, *last;
} AVIContext;
static offset_t start_tag(PutByteContext *pb, char *tag)
{
put_tag(pb, tag);
put_le32(pb, 0);
return put_pos(pb);
}
static void end_tag(PutByteContext *pb, offset_t start)
{
offset_t pos;
pos = put_pos(pb);
put_seek(pb, start - 4, SEEK_SET);
put_le32(pb, pos - start);
put_seek(pb, pos, SEEK_SET);
}
#define AVIF_HASINDEX 0x00000010 // Index at end of file?
#define AVIF_MUSTUSEINDEX 0x00000020
#define AVIF_ISINTERLEAVED 0x00000100
#define AVIF_TRUSTCKTYPE 0x00000800 // Use CKType to find key frames?
#define AVIF_WASCAPTUREFILE 0x00010000
#define AVIF_COPYRIGHTED 0x00020000
#define MKTAG(a,b,c,d) (a | (b << 8) | (c << 16) | (d << 24))
unsigned int codec_get_bmp_tag(int id)
{
switch(id) {
case CODEC_ID_H263:
return MKTAG('I', '2', '6', '3');
case CODEC_ID_MJPEG:
return MKTAG('M', 'J', 'P', 'G');
case CODEC_ID_DIVX:
return MKTAG('d', 'i', 'v', 'x');
default:
abort();
}
}
/* BITMAPINFOHEADER header */
void put_bmp_header(PutByteContext *pb, AVEncodeContext *enc)
{
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 */
put_le32(pb, codec_get_bmp_tag(enc->codec->id));
put_le32(pb, enc->width * enc->height * 3);
put_le32(pb, 0);
put_le32(pb, 0);
put_le32(pb, 0);
put_le32(pb, 0);
}
/* WAVEFORMATEX header */
void put_wav_header(PutByteContext *pb, AVEncodeContext *enc)
{
int id;
switch(enc->codec->id) {
case CODEC_ID_MP2:
id = 0x55; /* MP3 format */
break;
default:
abort();
}
put_le16(pb, id);
put_le16(pb, enc->channels);
put_le32(pb, enc->rate);
put_le32(pb, enc->bit_rate / 8);
put_le16(pb, 1); /* block align */
put_le16(pb, 16); /* bits per sample */
put_le16(pb, 0); /* wav_extra_size */
}
static int avi_write_header(AVFormatContext *s)
{
AVIContext *avi;
PutByteContext *pb = &s->pb;
int bitrate, n, i;
AVEncodeContext *stream;
offset_t list1, list2, strh, strf;
avi = malloc(sizeof(AVIContext));
if (!avi)
return -1;
memset(avi, 0, sizeof(AVIContext));
s->priv_data = avi;
put_tag(pb, "RIFF");
put_le32(pb, 0); /* file length */
put_tag(pb, "AVI ");
/* header list */
list1 = start_tag(pb, "LIST");
put_tag(pb, "hdrl");
/* avi header */
put_tag(pb, "avih");
put_le32(pb, 14 * 4);
bitrate = 0;
n = 0;
if (s->audio_enc) {
bitrate += s->audio_enc->bit_rate;
n++;
}
if (s->video_enc) {
bitrate += s->video_enc->bit_rate;
n++;
}
put_le32(pb, 1000000 / s->video_enc->rate);
put_le32(pb, bitrate / 8); /* XXX: not quite exact */
put_le32(pb, 0); /* padding */
put_le32(pb, AVIF_ISINTERLEAVED); /* flags */
put_le32(pb, 0); /* nb frames, filled later */
put_le32(pb, 0); /* initial frame */
put_le32(pb, n); /* nb streams */
put_le32(pb, 0); /* suggested buffer size */
put_le32(pb, s->video_enc->width);
put_le32(pb, s->video_enc->height);
put_le32(pb, 0); /* reserved */
put_le32(pb, 0); /* reserved */
put_le32(pb, 0); /* reserved */
put_le32(pb, 0); /* reserved */
/* stream list */
for(i=0;ivideo_enc;
else
stream = s->audio_enc;
/* stream generic header */
strh = start_tag(pb, "strh");
switch(stream->codec->type) {
case CODEC_TYPE_VIDEO:
put_tag(pb, "vids");
put_le32(pb, codec_get_bmp_tag(stream->codec->id));
put_le32(pb, 0); /* flags */
put_le16(pb, 0); /* priority */
put_le16(pb, 0); /* language */
put_le32(pb, 0); /* XXX: initial frame ? */
put_le32(pb, 1000); /* scale */
put_le32(pb, 1000 * stream->rate); /* rate */
put_le32(pb, 0); /* start */
put_le32(pb, 0); /* length, filled later */
put_le32(pb, 0); /* suggested buffer size */
put_le32(pb, 10000); /* quality */
put_le32(pb, stream->width * stream->height * 3); /* sample size */
break;
case CODEC_TYPE_AUDIO:
put_tag(pb, "auds");
put_le32(pb, 0);
put_le32(pb, 0); /* flags */
put_le16(pb, 0); /* priority */
put_le16(pb, 0); /* language */
put_le32(pb, 1); /* XXX: initial frame ? */
put_le32(pb, 1); /* scale */
put_le32(pb, stream->bit_rate / 8); /* rate */
put_le32(pb, 0); /* start */
put_le32(pb, 0); /* length, filled later */
put_le32(pb, 0); /* suggested buffer size */
put_le32(pb, -1); /* quality */
put_le32(pb, 1); /* sample size */
break;
}
put_le32(pb, 0);
put_le32(pb, 0);
end_tag(pb, strh);
strf = start_tag(pb, "strf");
switch(stream->codec->type) {
case CODEC_TYPE_VIDEO:
put_bmp_header(pb, stream);
break;
case CODEC_TYPE_AUDIO:
put_wav_header(pb, stream);
break;
}
end_tag(pb, strf);
end_tag(pb, list2);
}
end_tag(pb, list1);
avi->movi_list = start_tag(pb, "LIST");
avi->first = NULL;
avi->last = NULL;
put_tag(pb, "movi");
put_flush_packet(pb);
return 0;
}
static void new_index(AVFormatContext *s, AVEncodeContext *enc,
UINT8 *buf, unsigned int size)
{
AVIContext *avi = s->priv_data;
PutByteContext *pb = &s->pb;
AVIIndex *idx;
unsigned char tag[5];
unsigned int flags;
tag[0] = '0';
if (enc->codec->type == CODEC_TYPE_VIDEO) {
tag[1] = '0';
tag[2] = 'd';
tag[3] = 'c';
flags = enc->key_frame ? 0x10 : 0x00;
} else {
tag[1] = '1';
tag[2] = 'w';
tag[3] = 'b';
flags = 0;
}
if (!s->is_streamed) {
idx = malloc(sizeof(AVIIndex));
memcpy(idx->tag, tag, 4);
idx->flags = flags;
idx->pos = put_pos(pb) - avi->movi_list;
idx->len = size;
idx->next = NULL;
if (!avi->last)
avi->first = idx;
else
avi->last->next = idx;
avi->last = idx;
}
put_buffer(pb, tag, 4);
put_le32(pb, size);
put_buffer(pb, buf, size);
if (size & 1)
put_byte(pb, 0);
put_flush_packet(pb);
}
static int avi_write_audio(AVFormatContext *s, UINT8 *buf, int size)
{
new_index(s, s->audio_enc, buf, size);
return 0;
}
static int avi_write_video(AVFormatContext *s, UINT8 *buf, int size)
{
new_index(s, s->video_enc, buf, size);
return 0;
}
static int avi_write_trailer(AVFormatContext *s)
{
PutByteContext *pb = &s->pb;
AVIContext *avi = s->priv_data;
offset_t file_size, idx_chunk;
AVIIndex *idx;
if (!s->is_streamed) {
end_tag(pb, avi->movi_list);
idx_chunk = start_tag(pb, "idx1");
idx = avi->first;
while (idx != NULL) {
put_buffer(pb, idx->tag, 4);
put_le32(pb, idx->flags);
put_le32(pb, idx->pos);
put_le32(pb, idx->len);
idx = idx->next;
}
end_tag(pb, idx_chunk);
/* update file size */
file_size = put_pos(pb);
put_seek(pb, 4, SEEK_SET);
put_le32(pb, file_size);
put_seek(pb, file_size, SEEK_SET);
}
put_flush_packet(pb);
free(avi);
return 0;
}
AVFormat avi_format = {
"avi",
"avi format",
"",
"avi",
CODEC_ID_MP2,
CODEC_ID_DIVX,
avi_write_header,
avi_write_audio,
avi_write_video,
avi_write_trailer,
};