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ffmpeg/libav/avienc.c

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/*
* 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 "avformat.h"
#include "avi.h"
/*
* TODO:
* - fill all fields if non streamed (nb_frames for example)
*/
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;
offset_t start_tag(ByteIOContext *pb, char *tag)
{
put_tag(pb, tag);
put_le32(pb, 0);
return url_ftell(pb);
}
void end_tag(ByteIOContext *pb, offset_t start)
{
offset_t pos;
pos = url_ftell(pb);
url_fseek(pb, start - 4, SEEK_SET);
put_le32(pb, (UINT32)(pos - start));
url_fseek(pb, pos, SEEK_SET);
}
/* Note: when encoding, the first matching tag is used, so order is
important if multiple tags possible for a given codec. */
CodecTag codec_bmp_tags[] = {
{ CODEC_ID_H263, MKTAG('U', '2', '6', '3') },
{ CODEC_ID_H263P, MKTAG('U', '2', '6', '3') },
{ CODEC_ID_H263I, MKTAG('I', '2', '6', '3') }, /* intel h263 */
{ CODEC_ID_MJPEG, MKTAG('M', 'J', 'P', 'G') },
{ CODEC_ID_MPEG4, MKTAG('D', 'I', 'V', 'X') },
{ CODEC_ID_MPEG4, MKTAG('d', 'i', 'v', 'x') },
{ CODEC_ID_MPEG4, MKTAG(0x04, 0, 0, 0) }, /* some broken avi use this */
{ CODEC_ID_MSMPEG4, MKTAG('D', 'I', 'V', '3') }, /* default signature when using MSMPEG4 */
{ CODEC_ID_MSMPEG4, MKTAG('M', 'P', '4', '3') },
{ 0, 0 },
};
unsigned int codec_get_tag(CodecTag *tags, int id)
{
while (tags->id != 0) {
if (tags->id == id)
return tags->tag;
tags++;
}
return 0;
}
int codec_get_id(CodecTag *tags, unsigned int tag)
{
while (tags->id != 0) {
if (tags->tag == tag)
return tags->id;
tags++;
}
return 0;
}
unsigned int codec_get_bmp_tag(int id)
{
return codec_get_tag(codec_bmp_tags, id);
}
/* BITMAPINFOHEADER header */
void put_bmp_header(ByteIOContext *pb, AVCodecContext *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);
}
static int avi_write_header(AVFormatContext *s)
{
AVIContext *avi;
ByteIOContext *pb = &s->pb;
int bitrate, n, i, nb_frames;
AVCodecContext *stream, *video_enc;
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;
video_enc = NULL;
for(n=0;n<s->nb_streams;n++) {
stream = &s->streams[n]->codec;
bitrate += stream->bit_rate;
if (stream->codec_type == CODEC_TYPE_VIDEO)
video_enc = stream;
}
if (!video_enc) {
free(avi);
return -1;
}
nb_frames = 0;
put_le32(pb, (UINT32)(INT64_C(1000000) * FRAME_RATE_BASE / video_enc->frame_rate));
put_le32(pb, bitrate / 8); /* XXX: not quite exact */
put_le32(pb, 0); /* padding */
put_le32(pb, AVIF_TRUSTCKTYPE | AVIF_HASINDEX | AVIF_ISINTERLEAVED); /* flags */
put_le32(pb, nb_frames); /* nb frames, filled later */
put_le32(pb, 0); /* initial frame */
put_le32(pb, s->nb_streams); /* nb streams */
put_le32(pb, 1024 * 1024); /* suggested buffer size */
put_le32(pb, video_enc->width);
put_le32(pb, 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;i<n;i++) {
list2 = start_tag(pb, "LIST");
put_tag(pb, "strl");
stream = &s->streams[i]->codec;
/* 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); /* initial frame */
put_le32(pb, 1000); /* scale */
put_le32(pb, (1000 * stream->frame_rate) / FRAME_RATE_BASE); /* rate */
put_le32(pb, 0); /* start */
put_le32(pb, nb_frames); /* length, XXX: fill later */
put_le32(pb, 1024 * 1024); /* suggested buffer size */
put_le32(pb, 10000); /* quality */
put_le32(pb, stream->width * stream->height * 3); /* sample size */
put_le16(pb, 0);
put_le16(pb, 0);
put_le16(pb, stream->width);
put_le16(pb, stream->height);
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, 0); /* 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, XXX: filled later */
put_le32(pb, 12 * 1024); /* suggested buffer size */
put_le32(pb, -1); /* quality */
put_le32(pb, 1); /* sample size */
put_le32(pb, 0);
put_le32(pb, 0);
break;
}
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:
if (put_wav_header(pb, stream) < 0) {
free(avi);
return -1;
}
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 int avi_write_packet(AVFormatContext *s, int stream_index,
UINT8 *buf, int size)
{
AVIContext *avi = s->priv_data;
ByteIOContext *pb = &s->pb;
AVIIndex *idx;
unsigned char tag[5];
unsigned int flags;
AVCodecContext *enc;
enc = &s->streams[stream_index]->codec;
tag[0] = '0';
tag[1] = '0' + stream_index;
if (enc->codec_type == CODEC_TYPE_VIDEO) {
tag[2] = 'd';
tag[3] = 'c';
flags = enc->key_frame ? 0x10 : 0x00;
} else {
tag[2] = 'w';
tag[3] = 'b';
flags = 0x10;
}
if (!url_is_streamed(&s->pb)) {
idx = malloc(sizeof(AVIIndex));
memcpy(idx->tag, tag, 4);
idx->flags = flags;
idx->pos = url_ftell(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);
return 0;
}
static int avi_write_trailer(AVFormatContext *s)
{
ByteIOContext *pb = &s->pb;
AVIContext *avi = s->priv_data;
offset_t file_size, idx_chunk;
AVIIndex *idx;
if (!url_is_streamed(&s->pb)) {
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 = url_ftell(pb);
url_fseek(pb, 4, SEEK_SET);
put_le32(pb, (UINT32)(file_size - 8));
url_fseek(pb, file_size, SEEK_SET);
}
put_flush_packet(pb);
free(avi);
return 0;
}
AVFormat avi_format = {
"avi",
"avi format",
"video/x-msvideo",
"avi",
CODEC_ID_MP2,
CODEC_ID_MSMPEG4,
avi_write_header,
avi_write_packet,
avi_write_trailer,
avi_read_header,
avi_read_packet,
avi_read_close,
};
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