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FFmpeg/libav/rm.c

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/*
* "Real" compatible mux and demux.
* 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 "avformat.h"
/* in ms */
#define BUFFER_DURATION 0
typedef struct {
int nb_packets;
int packet_total_size;
int packet_max_size;
/* codec related output */
int bit_rate;
float frame_rate;
int nb_frames; /* current frame number */
int total_frames; /* total number of frames */
int num;
AVCodecContext *enc;
} StreamInfo;
typedef struct {
StreamInfo streams[2];
StreamInfo *audio_stream, *video_stream;
int data_pos; /* position of the data after the header */
int nb_packets;
} RMContext;
static void put_str(ByteIOContext *s, const char *tag)
{
put_be16(s,strlen(tag));
while (*tag) {
put_byte(s, *tag++);
}
}
static void put_str8(ByteIOContext *s, const char *tag)
{
put_byte(s, strlen(tag));
while (*tag) {
put_byte(s, *tag++);
}
}
static void rv10_write_header(AVFormatContext *ctx,
int data_size, int index_pos)
{
RMContext *rm = ctx->priv_data;
ByteIOContext *s = &ctx->pb;
StreamInfo *stream;
unsigned char *data_offset_ptr, *start_ptr;
const char *desc, *mimetype;
int nb_packets, packet_total_size, packet_max_size, size, packet_avg_size, i;
int bit_rate, v, duration, flags, data_pos;
start_ptr = s->buf_ptr;
put_tag(s, ".RMF");
put_be32(s,18); /* header size */
put_be16(s,0);
put_be32(s,0);
put_be32(s,4 + ctx->nb_streams); /* num headers */
put_tag(s,"PROP");
put_be32(s, 50);
put_be16(s, 0);
packet_max_size = 0;
packet_total_size = 0;
nb_packets = 0;
bit_rate = 0;
duration = 0;
for(i=0;i<ctx->nb_streams;i++) {
StreamInfo *stream = &rm->streams[i];
bit_rate += stream->bit_rate;
if (stream->packet_max_size > packet_max_size)
packet_max_size = stream->packet_max_size;
nb_packets += stream->nb_packets;
packet_total_size += stream->packet_total_size;
/* select maximum duration */
v = (int) (1000.0 * (float)stream->total_frames / stream->frame_rate);
if (v > duration)
duration = v;
}
put_be32(s, bit_rate); /* max bit rate */
put_be32(s, bit_rate); /* avg bit rate */
put_be32(s, packet_max_size); /* max packet size */
if (nb_packets > 0)
packet_avg_size = packet_total_size / nb_packets;
else
packet_avg_size = 0;
put_be32(s, packet_avg_size); /* avg packet size */
put_be32(s, nb_packets); /* num packets */
put_be32(s, duration); /* duration */
put_be32(s, BUFFER_DURATION); /* preroll */
put_be32(s, index_pos); /* index offset */
/* computation of data the data offset */
data_offset_ptr = s->buf_ptr;
put_be32(s, 0); /* data offset : will be patched after */
put_be16(s, ctx->nb_streams); /* num streams */
flags = 1 | 2; /* save allowed & perfect play */
if (url_is_streamed(s))
flags |= 4; /* live broadcast */
put_be16(s, flags);
/* comments */
put_tag(s,"CONT");
size = strlen(ctx->title) + strlen(ctx->author) + strlen(ctx->copyright) +
strlen(ctx->comment) + 4 * 2 + 10;
put_be32(s,size);
put_be16(s,0);
put_str(s, ctx->title);
put_str(s, ctx->author);
put_str(s, ctx->copyright);
put_str(s, ctx->comment);
for(i=0;i<ctx->nb_streams;i++) {
int codec_data_size;
stream = &rm->streams[i];
if (stream->enc->codec_type == CODEC_TYPE_AUDIO) {
desc = "The Audio Stream";
mimetype = "audio/x-pn-realaudio";
codec_data_size = 73;
} else {
desc = "The Video Stream";
mimetype = "video/x-pn-realvideo";
codec_data_size = 34;
}
put_tag(s,"MDPR");
size = 10 + 9 * 4 + strlen(desc) + strlen(mimetype) + codec_data_size;
put_be32(s, size);
put_be16(s, 0);
put_be16(s, i); /* stream number */
put_be32(s, stream->bit_rate); /* max bit rate */
put_be32(s, stream->bit_rate); /* avg bit rate */
put_be32(s, stream->packet_max_size); /* max packet size */
if (stream->nb_packets > 0)
packet_avg_size = stream->packet_total_size /
stream->nb_packets;
else
packet_avg_size = 0;
put_be32(s, packet_avg_size); /* avg packet size */
put_be32(s, 0); /* start time */
put_be32(s, BUFFER_DURATION); /* preroll */
/* duration */
put_be32(s, (int)(stream->total_frames * 1000 / stream->frame_rate));
put_str8(s, desc);
put_str8(s, mimetype);
put_be32(s, codec_data_size);
if (stream->enc->codec_type == CODEC_TYPE_AUDIO) {
int coded_frame_size, fscode, sample_rate;
sample_rate = stream->enc->sample_rate;
coded_frame_size = (stream->enc->bit_rate *
stream->enc->frame_size) / (8 * sample_rate);
/* audio codec info */
put_tag(s, ".ra");
put_byte(s, 0xfd);
put_be32(s, 0x00040000); /* version */
put_tag(s, ".ra4");
put_be32(s, 0x01b53530); /* stream length */
put_be16(s, 4); /* unknown */
put_be32(s, 0x39); /* header size */
switch(sample_rate) {
case 48000:
case 24000:
case 12000:
fscode = 1;
break;
default:
case 44100:
case 22050:
case 11025:
fscode = 2;
break;
case 32000:
case 16000:
case 8000:
fscode = 3;
}
put_be16(s, fscode); /* codec additional info, for AC3, seems
to be a frequency code */
/* special hack to compensate rounding errors... */
if (coded_frame_size == 557)
coded_frame_size--;
put_be32(s, coded_frame_size); /* frame length */
put_be32(s, 0x51540); /* unknown */
put_be32(s, 0x249f0); /* unknown */
put_be32(s, 0x249f0); /* unknown */
put_be16(s, 0x01);
/* frame length : seems to be very important */
put_be16(s, coded_frame_size);
put_be32(s, 0); /* unknown */
put_be16(s, stream->enc->sample_rate); /* sample rate */
put_be32(s, 0x10); /* unknown */
put_be16(s, stream->enc->channels);
put_str8(s, "Int0"); /* codec name */
put_str8(s, "dnet"); /* codec name */
put_be16(s, 0); /* title length */
put_be16(s, 0); /* author length */
put_be16(s, 0); /* copyright length */
put_byte(s, 0); /* end of header */
} else {
/* video codec info */
put_be32(s,34); /* size */
put_tag(s,"VIDORV10");
put_be16(s, stream->enc->width);
put_be16(s, stream->enc->height);
put_be16(s, 24); /* frames per seconds ? */
put_be32(s,0); /* unknown meaning */
put_be16(s, 12); /* unknown meaning */
put_be32(s,0); /* unknown meaning */
put_be16(s, 8); /* unknown meaning */
/* Seems to be the codec version: only use basic H263. The next
versions seems to add a diffential DC coding as in
MPEG... nothing new under the sun */
put_be32(s,0x10000000);
//put_be32(s,0x10003000);
}
}
/* patch data offset field */
data_pos = s->buf_ptr - start_ptr;
rm->data_pos = data_pos;
data_offset_ptr[0] = data_pos >> 24;
data_offset_ptr[1] = data_pos >> 16;
data_offset_ptr[2] = data_pos >> 8;
data_offset_ptr[3] = data_pos;
/* data stream */
put_tag(s,"DATA");
put_be32(s,data_size + 10 + 8);
put_be16(s,0);
put_be32(s, nb_packets); /* number of packets */
put_be32(s,0); /* next data header */
}
static void write_packet_header(AVFormatContext *ctx, StreamInfo *stream,
int length, int key_frame)
{
int timestamp;
ByteIOContext *s = &ctx->pb;
stream->nb_packets++;
stream->packet_total_size += length;
if (length > stream->packet_max_size)
stream->packet_max_size = length;
put_be16(s,0); /* version */
put_be16(s,length + 12);
put_be16(s, stream->num); /* stream number */
timestamp = (1000 * (float)stream->nb_frames) / stream->frame_rate;
put_be32(s, timestamp); /* timestamp */
put_byte(s, 0); /* reserved */
put_byte(s, key_frame ? 2 : 0); /* flags */
}
static int rm_write_header(AVFormatContext *s)
{
StreamInfo *stream;
RMContext *rm;
int n;
AVCodecContext *codec;
rm = malloc(sizeof(RMContext));
if (!rm)
return -1;
memset(rm, 0, sizeof(RMContext));
s->priv_data = rm;
for(n=0;n<s->nb_streams;n++) {
s->streams[n]->id = n;
codec = &s->streams[n]->codec;
stream = &rm->streams[n];
memset(stream, 0, sizeof(StreamInfo));
stream->num = n;
stream->bit_rate = codec->bit_rate;
stream->enc = codec;
switch(codec->codec_type) {
case CODEC_TYPE_AUDIO:
rm->audio_stream = stream;
stream->frame_rate = (float)codec->sample_rate / (float)codec->frame_size;
/* XXX: dummy values */
stream->packet_max_size = 1024;
stream->nb_packets = 0;
stream->total_frames = stream->nb_packets;
break;
case CODEC_TYPE_VIDEO:
rm->video_stream = stream;
stream->frame_rate = (float)codec->frame_rate / (float)FRAME_RATE_BASE;
/* XXX: dummy values */
stream->packet_max_size = 4096;
stream->nb_packets = 0;
stream->total_frames = stream->nb_packets;
break;
}
}
rv10_write_header(s, 0, 0);
put_flush_packet(&s->pb);
return 0;
}
static int rm_write_audio(AVFormatContext *s, UINT8 *buf, int size)
{
UINT8 *buf1;
RMContext *rm = s->priv_data;
ByteIOContext *pb = &s->pb;
StreamInfo *stream = rm->audio_stream;
int i;
/* XXX: suppress this malloc */
buf1= (UINT8*) malloc( size * sizeof(UINT8) );
write_packet_header(s, stream, size, stream->enc->key_frame);
/* for AC3, the words seems to be reversed */
for(i=0;i<size;i+=2) {
buf1[i] = buf[i+1];
buf1[i+1] = buf[i];
}
put_buffer(pb, buf1, size);
put_flush_packet(pb);
stream->nb_frames++;
free(buf1);
return 0;
}
static int rm_write_video(AVFormatContext *s, UINT8 *buf, int size)
{
RMContext *rm = s->priv_data;
ByteIOContext *pb = &s->pb;
StreamInfo *stream = rm->video_stream;
int key_frame = stream->enc->key_frame;
/* XXX: this is incorrect: should be a parameter */
/* Well, I spent some time finding the meaning of these bits. I am
not sure I understood everything, but it works !! */
#if 1
write_packet_header(s, stream, size + 7, key_frame);
/* bit 7: '1' if final packet of a frame converted in several packets */
put_byte(pb, 0x81);
/* bit 7: '1' if I frame. bits 6..0 : sequence number in current
frame starting from 1 */
if (key_frame) {
put_byte(pb, 0x81);
} else {
put_byte(pb, 0x01);
}
put_be16(pb, 0x4000 | (size)); /* total frame size */
put_be16(pb, 0x4000 | (size)); /* offset from the start or the end */
#else
/* full frame */
write_packet_header(s, size + 6);
put_byte(pb, 0xc0);
put_be16(pb, 0x4000 | size); /* total frame size */
put_be16(pb, 0x4000 + packet_number * 126); /* position in stream */
#endif
put_byte(pb, stream->nb_frames & 0xff);
put_buffer(pb, buf, size);
put_flush_packet(pb);
stream->nb_frames++;
return 0;
}
static int rm_write_packet(AVFormatContext *s, int stream_index,
UINT8 *buf, int size)
{
if (s->streams[stream_index]->codec.codec_type ==
CODEC_TYPE_AUDIO)
return rm_write_audio(s, buf, size);
else
return rm_write_video(s, buf, size);
}
static int rm_write_trailer(AVFormatContext *s)
{
RMContext *rm = s->priv_data;
int data_size, index_pos, i;
ByteIOContext *pb = &s->pb;
if (!url_is_streamed(&s->pb)) {
/* end of file: finish to write header */
index_pos = url_fseek(pb, 0, SEEK_CUR);
data_size = index_pos - rm->data_pos;
/* index */
put_tag(pb, "INDX");
put_be32(pb, 10 + 10 * s->nb_streams);
put_be16(pb, 0);
for(i=0;i<s->nb_streams;i++) {
put_be32(pb, 0); /* zero indices */
put_be16(pb, i); /* stream number */
put_be32(pb, 0); /* next index */
}
/* undocumented end header */
put_be32(pb, 0);
put_be32(pb, 0);
url_fseek(pb, 0, SEEK_SET);
for(i=0;i<s->nb_streams;i++)
rm->streams[i].total_frames = rm->streams[i].nb_frames;
rv10_write_header(s, data_size, index_pos);
} else {
/* undocumented end header */
put_be32(pb, 0);
put_be32(pb, 0);
}
put_flush_packet(pb);
free(rm);
return 0;
}
/***************************************************/
static void get_str(ByteIOContext *pb, char *buf, int buf_size)
{
int len, i;
char *q;
len = get_be16(pb);
q = buf;
for(i=0;i<len;i++) {
if (i < buf_size - 1)
*q++ = get_byte(pb);
}
*q = '\0';
}
static void get_str8(ByteIOContext *pb, char *buf, int buf_size)
{
int len, i;
char *q;
len = get_byte(pb);
q = buf;
for(i=0;i<len;i++) {
if (i < buf_size - 1)
*q++ = get_byte(pb);
}
*q = '\0';
}
static int rm_read_header(AVFormatContext *s, AVFormatParameters *ap)
{
RMContext *rm;
AVStream *st;
ByteIOContext *pb = &s->pb;
unsigned int tag, v;
int tag_size, size, codec_data_size, i;
INT64 codec_pos;
unsigned int h263_hack_version;
char buf[128];
if (get_le32(pb) != MKTAG('.', 'R', 'M', 'F'))
return -EIO;
rm = av_mallocz(sizeof(RMContext));
if (!rm)
return -ENOMEM;
s->priv_data = rm;
get_be32(pb); /* header size */
get_be16(pb);
get_be32(pb);
get_be32(pb); /* number of headers */
for(;;) {
if (url_feof(pb))
goto fail;
tag = get_le32(pb);
tag_size = get_be32(pb);
get_be16(pb);
#if 0
printf("tag=%c%c%c%c (%08x) size=%d\n",
(tag) & 0xff,
(tag >> 8) & 0xff,
(tag >> 16) & 0xff,
(tag >> 24) & 0xff,
tag,
tag_size);
#endif
if (tag_size < 10)
goto fail;
switch(tag) {
case MKTAG('P', 'R', 'O', 'P'):
/* file header */
get_be32(pb); /* max bit rate */
get_be32(pb); /* avg bit rate */
get_be32(pb); /* max packet size */
get_be32(pb); /* avg packet size */
get_be32(pb); /* nb packets */
get_be32(pb); /* duration */
get_be32(pb); /* preroll */
get_be32(pb); /* index offset */
get_be32(pb); /* data offset */
get_be16(pb); /* nb streams */
get_be16(pb); /* flags */
break;
case MKTAG('C', 'O', 'N', 'T'):
get_str(pb, s->title, sizeof(s->title));
get_str(pb, s->author, sizeof(s->author));
get_str(pb, s->copyright, sizeof(s->copyright));
get_str(pb, s->comment, sizeof(s->comment));
break;
case MKTAG('M', 'D', 'P', 'R'):
st = av_mallocz(sizeof(AVStream));
if (!st)
goto fail;
s->streams[s->nb_streams++] = st;
st->id = get_be16(pb);
get_be32(pb); /* max bit rate */
st->codec.bit_rate = get_be32(pb); /* bit rate */
get_be32(pb); /* max packet size */
get_be32(pb); /* avg packet size */
get_be32(pb); /* start time */
get_be32(pb); /* preroll */
get_be32(pb); /* duration */
get_str8(pb, buf, sizeof(buf)); /* desc */
get_str8(pb, buf, sizeof(buf)); /* mimetype */
codec_data_size = get_be32(pb);
codec_pos = url_ftell(pb);
v = get_be32(pb);
if (v == MKTAG(0xfd, 'a', 'r', '.')) {
/* ra type header */
get_be32(pb); /* version */
get_be32(pb); /* .ra4 */
get_be32(pb);
get_be16(pb);
get_be32(pb); /* header size */
get_be16(pb); /* add codec info */
get_be32(pb); /* coded frame size */
get_be32(pb); /* ??? */
get_be32(pb); /* ??? */
get_be32(pb); /* ??? */
get_be16(pb); /* 1 */
get_be16(pb); /* coded frame size */
get_be32(pb);
st->codec.sample_rate = get_be16(pb);
get_be32(pb);
st->codec.channels = get_be16(pb);
get_str8(pb, buf, sizeof(buf)); /* desc */
get_str8(pb, buf, sizeof(buf)); /* desc */
st->codec.codec_type = CODEC_TYPE_AUDIO;
if (!strcmp(buf, "dnet")) {
st->codec.codec_id = CODEC_ID_AC3;
} else {
st->codec.codec_id = CODEC_ID_NONE;
nstrcpy(st->codec.codec_name, sizeof(st->codec.codec_name),
buf);
}
} else {
if (get_le32(pb) != MKTAG('V', 'I', 'D', 'O')) {
fail1:
fprintf(stderr, "Unsupported video codec\n");
goto fail;
}
st->codec.codec_tag = get_le32(pb);
if (st->codec.codec_tag != MKTAG('R', 'V', '1', '0'))
goto fail1;
st->codec.width = get_be16(pb);
st->codec.height = get_be16(pb);
st->codec.frame_rate = get_be16(pb) * FRAME_RATE_BASE;
st->codec.codec_type = CODEC_TYPE_VIDEO;
get_be32(pb);
get_be16(pb);
get_be32(pb);
get_be16(pb);
/* modification of h263 codec version (!) */
h263_hack_version = get_be32(pb);
switch(h263_hack_version) {
case 0x10000000:
st->codec.sub_id = 0;
st->codec.codec_id = CODEC_ID_RV10;
break;
case 0x10003000:
case 0x10003001:
st->codec.sub_id = 3;
st->codec.codec_id = CODEC_ID_RV10;
break;
default:
/* not handled */
st->codec.codec_id = CODEC_ID_NONE;
break;
}
}
/* skip codec info */
size = url_ftell(pb) - codec_pos;
url_fskip(pb, codec_data_size - size);
break;
case MKTAG('D', 'A', 'T', 'A'):
goto header_end;
default:
/* unknown tag: skip it */
url_fskip(pb, tag_size - 10);
break;
}
}
header_end:
rm->nb_packets = get_be32(pb); /* number of packets */
get_be32(pb); /* next data header */
return 0;
fail:
for(i=0;i<s->nb_streams;i++) {
free(s->streams[i]);
}
return -EIO;
}
static int rm_read_packet(AVFormatContext *s, AVPacket *pkt)
{
RMContext *rm = s->priv_data;
ByteIOContext *pb = &s->pb;
AVStream *st;
int len, num, timestamp, i, tmp, j;
UINT8 *ptr;
redo:
if (rm->nb_packets == 0)
return -EIO;
get_be16(pb);
len = get_be16(pb);
if (len < 12)
return -EIO;
num = get_be16(pb);
timestamp = get_be32(pb);
get_byte(pb); /* reserved */
get_byte(pb); /* flags */
rm->nb_packets--;
len -= 12;
st = NULL;
for(i=0;i<s->nb_streams;i++) {
st = s->streams[i];
if (num == st->id)
break;
}
if (i == s->nb_streams) {
/* skip packet if unknown number */
url_fskip(pb, len);
goto redo;
}
av_new_packet(pkt, len);
pkt->stream_index = i;
get_buffer(pb, pkt->data, len);
/* for AC3, needs to swap bytes */
if (st->codec.codec_id == CODEC_ID_AC3) {
ptr = pkt->data;
for(j=0;j<len;j+=2) {
tmp = ptr[0];
ptr[0] = ptr[1];
ptr[1] = tmp;
ptr += 2;
}
}
return 0;
}
static int rm_read_close(AVFormatContext *s)
{
RMContext *rm = s->priv_data;
free(rm);
return 0;
}
AVFormat rm_format = {
"rm",
"rm format",
"audio/x-pn-realaudio",
"rm,ra",
CODEC_ID_AC3,
CODEC_ID_RV10,
rm_write_header,
rm_write_packet,
rm_write_trailer,
rm_read_header,
rm_read_packet,
rm_read_close,
};