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ffmpeg/libavformat/rmdec.c

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/*
* "Real" compatible demuxer.
* Copyright (c) 2000, 2001 Fabrice Bellard.
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "libavutil/avstring.h"
#include "avformat.h"
#include "rm.h"
static inline void get_strl(ByteIOContext *pb, char *buf, int buf_size, int len)
{
int i;
char *q, r;
q = buf;
for(i=0;i<len;i++) {
r = get_byte(pb);
if (i < buf_size - 1)
*q++ = r;
}
if (buf_size > 0) *q = '\0';
}
static void get_str16(ByteIOContext *pb, char *buf, int buf_size)
{
get_strl(pb, buf, buf_size, get_be16(pb));
}
static void get_str8(ByteIOContext *pb, char *buf, int buf_size)
{
get_strl(pb, buf, buf_size, get_byte(pb));
}
static int rm_read_audio_stream_info(AVFormatContext *s, AVStream *st,
int read_all)
{
RMContext *rm = s->priv_data;
ByteIOContext *pb = s->pb;
char buf[256];
uint32_t version;
int i;
/* ra type header */
version = get_be32(pb); /* version */
if (((version >> 16) & 0xff) == 3) {
int64_t startpos = url_ftell(pb);
/* very old version */
for(i = 0; i < 14; i++)
get_byte(pb);
get_str8(pb, s->title, sizeof(s->title));
get_str8(pb, s->author, sizeof(s->author));
get_str8(pb, s->copyright, sizeof(s->copyright));
get_str8(pb, s->comment, sizeof(s->comment));
if ((startpos + (version & 0xffff)) >= url_ftell(pb) + 2) {
// fourcc (should always be "lpcJ")
get_byte(pb);
get_str8(pb, buf, sizeof(buf));
}
// Skip extra header crap (this should never happen)
if ((startpos + (version & 0xffff)) > url_ftell(pb))
url_fskip(pb, (version & 0xffff) + startpos - url_ftell(pb));
st->codec->sample_rate = 8000;
st->codec->channels = 1;
st->codec->codec_type = CODEC_TYPE_AUDIO;
st->codec->codec_id = CODEC_ID_RA_144;
} else {
int flavor, sub_packet_h, coded_framesize, sub_packet_size;
/* old version (4) */
get_be32(pb); /* .ra4 */
get_be32(pb); /* data size */
get_be16(pb); /* version2 */
get_be32(pb); /* header size */
flavor= get_be16(pb); /* add codec info / flavor */
rm->coded_framesize = coded_framesize = get_be32(pb); /* coded frame size */
get_be32(pb); /* ??? */
get_be32(pb); /* ??? */
get_be32(pb); /* ??? */
rm->sub_packet_h = sub_packet_h = get_be16(pb); /* 1 */
st->codec->block_align= get_be16(pb); /* frame size */
rm->sub_packet_size = sub_packet_size = get_be16(pb); /* sub packet size */
get_be16(pb); /* ??? */
if (((version >> 16) & 0xff) == 5) {
get_be16(pb); get_be16(pb); get_be16(pb); }
st->codec->sample_rate = get_be16(pb);
get_be32(pb);
st->codec->channels = get_be16(pb);
if (((version >> 16) & 0xff) == 5) {
get_be32(pb);
buf[0] = get_byte(pb);
buf[1] = get_byte(pb);
buf[2] = get_byte(pb);
buf[3] = get_byte(pb);
buf[4] = 0;
} else {
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;
st->need_parsing = AVSTREAM_PARSE_FULL;
} else if (!strcmp(buf, "28_8")) {
st->codec->codec_id = CODEC_ID_RA_288;
st->codec->extradata_size= 0;
rm->audio_framesize = st->codec->block_align;
st->codec->block_align = coded_framesize;
if(rm->audio_framesize >= UINT_MAX / sub_packet_h){
av_log(s, AV_LOG_ERROR, "rm->audio_framesize * sub_packet_h too large\n");
return -1;
}
rm->audiobuf = av_malloc(rm->audio_framesize * sub_packet_h);
} else if ((!strcmp(buf, "cook")) || (!strcmp(buf, "atrc"))) {
int codecdata_length, i;
get_be16(pb); get_byte(pb);
if (((version >> 16) & 0xff) == 5)
get_byte(pb);
codecdata_length = get_be32(pb);
if(codecdata_length + FF_INPUT_BUFFER_PADDING_SIZE <= (unsigned)codecdata_length){
av_log(s, AV_LOG_ERROR, "codecdata_length too large\n");
return -1;
}
if (!strcmp(buf, "cook")) st->codec->codec_id = CODEC_ID_COOK;
else st->codec->codec_id = CODEC_ID_ATRAC3;
st->codec->extradata_size= codecdata_length;
st->codec->extradata= av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
for(i = 0; i < codecdata_length; i++)
((uint8_t*)st->codec->extradata)[i] = get_byte(pb);
rm->audio_framesize = st->codec->block_align;
st->codec->block_align = rm->sub_packet_size;
if(rm->audio_framesize >= UINT_MAX / sub_packet_h){
av_log(s, AV_LOG_ERROR, "rm->audio_framesize * sub_packet_h too large\n");
return -1;
}
rm->audiobuf = av_malloc(rm->audio_framesize * sub_packet_h);
} else if (!strcmp(buf, "raac") || !strcmp(buf, "racp")) {
int codecdata_length, i;
get_be16(pb); get_byte(pb);
if (((version >> 16) & 0xff) == 5)
get_byte(pb);
st->codec->codec_id = CODEC_ID_AAC;
codecdata_length = get_be32(pb);
if(codecdata_length + FF_INPUT_BUFFER_PADDING_SIZE <= (unsigned)codecdata_length){
av_log(s, AV_LOG_ERROR, "codecdata_length too large\n");
return -1;
}
if (codecdata_length >= 1) {
st->codec->extradata_size = codecdata_length - 1;
st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
get_byte(pb);
for(i = 0; i < st->codec->extradata_size; i++)
((uint8_t*)st->codec->extradata)[i] = get_byte(pb);
}
} else {
st->codec->codec_id = CODEC_ID_NONE;
av_strlcpy(st->codec->codec_name, buf, sizeof(st->codec->codec_name));
}
if (read_all) {
get_byte(pb);
get_byte(pb);
get_byte(pb);
get_str8(pb, s->title, sizeof(s->title));
get_str8(pb, s->author, sizeof(s->author));
get_str8(pb, s->copyright, sizeof(s->copyright));
get_str8(pb, s->comment, sizeof(s->comment));
}
}
return 0;
}
int
ff_rm_read_mdpr_codecdata (AVFormatContext *s, AVStream *st)
{
ByteIOContext *pb = s->pb;
unsigned int v;
int codec_data_size, size;
int64_t codec_pos;
codec_data_size = get_be32(pb);
codec_pos = url_ftell(pb);
v = get_be32(pb);
if (v == MKTAG(0xfd, 'a', 'r', '.')) {
/* ra type header */
if (rm_read_audio_stream_info(s, st, 0))
return -1;
} else {
int fps, fps2;
if (get_le32(pb) != MKTAG('V', 'I', 'D', 'O')) {
fail1:
av_log(st->codec, AV_LOG_ERROR, "Unsupported video codec\n");
goto skip;
}
st->codec->codec_tag = get_le32(pb);
// av_log(NULL, AV_LOG_DEBUG, "%X %X\n", st->codec->codec_tag, MKTAG('R', 'V', '2', '0'));
if ( st->codec->codec_tag != MKTAG('R', 'V', '1', '0')
&& st->codec->codec_tag != MKTAG('R', 'V', '2', '0')
&& st->codec->codec_tag != MKTAG('R', 'V', '3', '0')
&& st->codec->codec_tag != MKTAG('R', 'V', '4', '0'))
goto fail1;
st->codec->width = get_be16(pb);
st->codec->height = get_be16(pb);
st->codec->time_base.num= 1;
fps= get_be16(pb);
st->codec->codec_type = CODEC_TYPE_VIDEO;
get_be32(pb);
fps2= get_be16(pb);
get_be16(pb);
st->codec->extradata_size= codec_data_size - (url_ftell(pb) - codec_pos);
if(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE <= (unsigned)st->codec->extradata_size){
//check is redundant as get_buffer() will catch this
av_log(s, AV_LOG_ERROR, "st->codec->extradata_size too large\n");
return -1;
}
st->codec->extradata= av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
if (!st->codec->extradata)
return AVERROR(ENOMEM);
get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
// av_log(NULL, AV_LOG_DEBUG, "fps= %d fps2= %d\n", fps, fps2);
st->codec->time_base.den = fps * st->codec->time_base.num;
switch(((uint8_t*)st->codec->extradata)[4]>>4){
case 1: st->codec->codec_id = CODEC_ID_RV10; break;
case 2: st->codec->codec_id = CODEC_ID_RV20; break;
case 3: st->codec->codec_id = CODEC_ID_RV30; break;
case 4: st->codec->codec_id = CODEC_ID_RV40; break;
default: goto fail1;
}
}
skip:
/* skip codec info */
size = url_ftell(pb) - codec_pos;
url_fskip(pb, codec_data_size - size);
return 0;
}
static int rm_read_header_old(AVFormatContext *s, AVFormatParameters *ap)
{
RMContext *rm = s->priv_data;
AVStream *st;
rm->old_format = 1;
st = av_new_stream(s, 0);
if (!st)
return -1;
return rm_read_audio_stream_info(s, st, 1);
}
static int rm_read_header(AVFormatContext *s, AVFormatParameters *ap)
{
RMContext *rm = s->priv_data;
AVStream *st;
ByteIOContext *pb = s->pb;
unsigned int tag;
int tag_size, i;
unsigned int start_time, duration;
char buf[128];
int flags = 0;
tag = get_le32(pb);
if (tag == MKTAG('.', 'r', 'a', 0xfd)) {
/* very old .ra format */
return rm_read_header_old(s, ap);
} else if (tag != MKTAG('.', 'R', 'M', 'F')) {
return AVERROR(EIO);
}
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 && tag != MKTAG('D', 'A', 'T', 'A'))
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 */
flags = get_be16(pb); /* flags */
break;
case MKTAG('C', 'O', 'N', 'T'):
get_str16(pb, s->title, sizeof(s->title));
get_str16(pb, s->author, sizeof(s->author));
get_str16(pb, s->copyright, sizeof(s->copyright));
get_str16(pb, s->comment, sizeof(s->comment));
break;
case MKTAG('M', 'D', 'P', 'R'):
st = av_new_stream(s, 0);
if (!st)
goto fail;
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 */
start_time = get_be32(pb); /* start time */
get_be32(pb); /* preroll */
duration = get_be32(pb); /* duration */
st->start_time = start_time;
st->duration = duration;
get_str8(pb, buf, sizeof(buf)); /* desc */
get_str8(pb, buf, sizeof(buf)); /* mimetype */
st->codec->codec_type = CODEC_TYPE_DATA;
av_set_pts_info(st, 64, 1, 1000);
if (ff_rm_read_mdpr_codecdata(s, st) < 0)
return -1;
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 */
if (!rm->nb_packets && (flags & 4))
rm->nb_packets = 3600 * 25;
get_be32(pb); /* next data header */
rm->curpic_num = -1;
return 0;
fail:
for(i=0;i<s->nb_streams;i++) {
av_free(s->streams[i]);
}
return AVERROR(EIO);
}
static int get_num(ByteIOContext *pb, int *len)
{
int n, n1;
n = get_be16(pb);
(*len)-=2;
n &= 0x7FFF;
if (n >= 0x4000) {
return n - 0x4000;
} else {
n1 = get_be16(pb);
(*len)-=2;
return (n << 16) | n1;
}
}
/* multiple of 20 bytes for ra144 (ugly) */
#define RAW_PACKET_SIZE 1000
static int sync(AVFormatContext *s, int64_t *timestamp, int *flags, int *stream_index, int64_t *pos){
RMContext *rm = s->priv_data;
ByteIOContext *pb = s->pb;
int len, num, res, i;
AVStream *st;
uint32_t state=0xFFFFFFFF;
while(!url_feof(pb)){
*pos= url_ftell(pb) - 3;
if(rm->remaining_len > 0){
num= rm->current_stream;
len= rm->remaining_len;
*timestamp = AV_NOPTS_VALUE;
*flags= 0;
}else{
state= (state<<8) + get_byte(pb);
if(state == MKBETAG('I', 'N', 'D', 'X')){
len = get_be16(pb) - 6;
if(len<0)
continue;
goto skip;
}
if(state > (unsigned)0xFFFF || state < 12)
continue;
len=state;
state= 0xFFFFFFFF;
num = get_be16(pb);
*timestamp = get_be32(pb);
res= get_byte(pb); /* reserved */
*flags = get_byte(pb); /* flags */
len -= 12;
}
for(i=0;i<s->nb_streams;i++) {
st = s->streams[i];
if (num == st->id)
break;
}
if (i == s->nb_streams) {
skip:
/* skip packet if unknown number */
url_fskip(pb, len);
rm->remaining_len -= len;
continue;
}
*stream_index= i;
return len;
}
return -1;
}
static int rm_assemble_video_frame(AVFormatContext *s, RMContext *rm, AVPacket *pkt, int len)
{
ByteIOContext *pb = s->pb;
int hdr, seq, pic_num, len2, pos;
int type;
hdr = get_byte(pb); len--;
type = hdr >> 6;
switch(type){
case 0: // slice
case 2: // last slice
seq = get_byte(pb); len--;
len2 = get_num(pb, &len);
pos = get_num(pb, &len);
pic_num = get_byte(pb); len--;
rm->remaining_len = len;
break;
case 1: //whole frame
seq = get_byte(pb); len--;
if(av_new_packet(pkt, len + 9) < 0)
return AVERROR(EIO);
pkt->data[0] = 0;
AV_WL32(pkt->data + 1, 1);
AV_WL32(pkt->data + 5, 0);
get_buffer(pb, pkt->data + 9, len);
rm->remaining_len = 0;
return 0;
case 3: //frame as a part of packet
len2 = get_num(pb, &len);
pos = get_num(pb, &len);
pic_num = get_byte(pb); len--;
rm->remaining_len = len - len2;
if(av_new_packet(pkt, len2 + 9) < 0)
return AVERROR(EIO);
pkt->data[0] = 0;
AV_WL32(pkt->data + 1, 1);
AV_WL32(pkt->data + 5, 0);
get_buffer(pb, pkt->data + 9, len2);
return 0;
}
//now we have to deal with single slice
if((seq & 0x7F) == 1 || rm->curpic_num != pic_num){
rm->slices = ((hdr & 0x3F) << 1) + 1;
rm->videobufsize = len2 + 8*rm->slices + 1;
av_free(rm->videobuf);
if(!(rm->videobuf = av_malloc(rm->videobufsize)))
return AVERROR(ENOMEM);
rm->videobufpos = 8*rm->slices + 1;
rm->cur_slice = 0;
rm->curpic_num = pic_num;
rm->pktpos = url_ftell(pb);
}
if(type == 2)
len = FFMIN(len, pos);
if(++rm->cur_slice > rm->slices)
return 1;
AV_WL32(rm->videobuf - 7 + 8*rm->cur_slice, 1);
AV_WL32(rm->videobuf - 3 + 8*rm->cur_slice, rm->videobufpos - 8*rm->slices - 1);
if(rm->videobufpos + len > rm->videobufsize)
return 1;
if (get_buffer(pb, rm->videobuf + rm->videobufpos, len) != len)
return AVERROR(EIO);
rm->videobufpos += len;
rm->remaining_len-= len;
if(type == 2 || (rm->videobufpos) == rm->videobufsize){
rm->videobuf[0] = rm->cur_slice-1;
if(av_new_packet(pkt, rm->videobufpos - 8*(rm->slices - rm->cur_slice)) < 0)
return AVERROR(ENOMEM);
memcpy(pkt->data, rm->videobuf, 1 + 8*rm->cur_slice);
memcpy(pkt->data + 1 + 8*rm->cur_slice, rm->videobuf + 1 + 8*rm->slices,
rm->videobufpos - 1 - 8*rm->slices);
pkt->pts = AV_NOPTS_VALUE;
pkt->pos = rm->pktpos;
return 0;
}
return 1;
}
static inline void
rm_ac3_swap_bytes (AVStream *st, AVPacket *pkt)
{
uint8_t *ptr;
int j;
if (st->codec->codec_id == CODEC_ID_AC3) {
ptr = pkt->data;
for (j=0;j<pkt->size;j+=2) {
FFSWAP(int, ptr[0], ptr[1]);
ptr += 2;
}
}
}
int
ff_rm_parse_packet (AVFormatContext *s, AVStream *st, int len, AVPacket *pkt,
int *seq, int *flags, int64_t *timestamp)
{
ByteIOContext *pb = s->pb;
RMContext *rm = s->priv_data;
if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
rm->current_stream= st->id;
if(rm_assemble_video_frame(s, rm, pkt, len) == 1)
return -1; //got partial frame
} else if (st->codec->codec_type == CODEC_TYPE_AUDIO) {
if ((st->codec->codec_id == CODEC_ID_RA_288) ||
(st->codec->codec_id == CODEC_ID_COOK) ||
(st->codec->codec_id == CODEC_ID_ATRAC3)) {
int x;
int sps = rm->sub_packet_size;
int cfs = rm->coded_framesize;
int h = rm->sub_packet_h;
int y = rm->sub_packet_cnt;
int w = rm->audio_framesize;
if (*flags & 2)
y = rm->sub_packet_cnt = 0;
if (!y)
rm->audiotimestamp = *timestamp;
switch(st->codec->codec_id) {
case CODEC_ID_RA_288:
for (x = 0; x < h/2; x++)
get_buffer(pb, rm->audiobuf+x*2*w+y*cfs, cfs);
break;
case CODEC_ID_ATRAC3:
case CODEC_ID_COOK:
for (x = 0; x < w/sps; x++)
get_buffer(pb, rm->audiobuf+sps*(h*x+((h+1)/2)*(y&1)+(y>>1)), sps);
break;
}
if (++(rm->sub_packet_cnt) < h)
return -1;
else {
rm->sub_packet_cnt = 0;
rm->audio_stream_num = st->index;
rm->audio_pkt_cnt = h * w / st->codec->block_align - 1;
// Release first audio packet
av_new_packet(pkt, st->codec->block_align);
memcpy(pkt->data, rm->audiobuf, st->codec->block_align);
*timestamp = rm->audiotimestamp;
*flags = 2; // Mark first packet as keyframe
}
} else if (st->codec->codec_id == CODEC_ID_AAC) {
int x;
rm->audio_stream_num = st->index;
rm->sub_packet_cnt = (get_be16(pb) & 0xf0) >> 4;
if (rm->sub_packet_cnt) {
for (x = 0; x < rm->sub_packet_cnt; x++)
rm->sub_packet_lengths[x] = get_be16(pb);
// Release first audio packet
rm->audio_pkt_cnt = rm->sub_packet_cnt - 1;
av_get_packet(pb, pkt, rm->sub_packet_lengths[0]);
*flags = 2; // Mark first packet as keyframe
}
} else {
av_get_packet(pb, pkt, len);
rm_ac3_swap_bytes(st, pkt);
}
} else
av_get_packet(pb, pkt, len);
if( (st->discard >= AVDISCARD_NONKEY && !(*flags&2))
|| st->discard >= AVDISCARD_ALL){
av_free_packet(pkt);
return -1;
}
pkt->stream_index = st->index;
#if 0
if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
if(st->codec->codec_id == CODEC_ID_RV20){
int seq= 128*(pkt->data[2]&0x7F) + (pkt->data[3]>>1);
av_log(NULL, AV_LOG_DEBUG, "%d %"PRId64" %d\n", *timestamp, *timestamp*512LL/25, seq);
seq |= (*timestamp&~0x3FFF);
if(seq - *timestamp > 0x2000) seq -= 0x4000;
if(seq - *timestamp < -0x2000) seq += 0x4000;
}
}
#endif
pkt->pts= *timestamp;
if (*flags & 2)
pkt->flags |= PKT_FLAG_KEY;
return 0;
}
void
ff_rm_retrieve_cache (AVFormatContext *s, AVStream *st, AVPacket *pkt)
{
ByteIOContext *pb = s->pb;
RMContext *rm = s->priv_data;
assert (rm->audio_pkt_cnt > 0);
if (st->codec->codec_id == CODEC_ID_AAC)
av_get_packet(pb, pkt, rm->sub_packet_lengths[rm->sub_packet_cnt - rm->audio_pkt_cnt]);
else {
av_new_packet(pkt, st->codec->block_align);
memcpy(pkt->data, rm->audiobuf + st->codec->block_align *
(rm->sub_packet_h * rm->audio_framesize / st->codec->block_align - rm->audio_pkt_cnt),
st->codec->block_align);
}
rm->audio_pkt_cnt--;
pkt->flags = 0;
pkt->stream_index = st->index;
}
static int rm_read_packet(AVFormatContext *s, AVPacket *pkt)
{
RMContext *rm = s->priv_data;
ByteIOContext *pb = s->pb;
AVStream *st;
int i, len;
int64_t timestamp, pos;
int flags;
if (rm->audio_pkt_cnt) {
// If there are queued audio packet return them first
st = s->streams[rm->audio_stream_num];
ff_rm_retrieve_cache(s, st, pkt);
} else if (rm->old_format) {
st = s->streams[0];
if (st->codec->codec_id == CODEC_ID_RA_288) {
int x, y;
for (y = 0; y < rm->sub_packet_h; y++)
for (x = 0; x < rm->sub_packet_h/2; x++)
if (get_buffer(pb, rm->audiobuf+x*2*rm->audio_framesize+y*rm->coded_framesize, rm->coded_framesize) <= 0)
return AVERROR(EIO);
rm->audio_stream_num = 0;
rm->audio_pkt_cnt = rm->sub_packet_h * rm->audio_framesize / st->codec->block_align - 1;
// Release first audio packet
av_new_packet(pkt, st->codec->block_align);
memcpy(pkt->data, rm->audiobuf, st->codec->block_align);
pkt->flags |= PKT_FLAG_KEY; // Mark first packet as keyframe
pkt->stream_index = 0;
} else {
/* just read raw bytes */
len = RAW_PACKET_SIZE;
len= av_get_packet(pb, pkt, len);
pkt->stream_index = 0;
if (len <= 0) {
return AVERROR(EIO);
}
pkt->size = len;
}
rm_ac3_swap_bytes(st, pkt);
} else {
int seq=1;
resync:
len=sync(s, &timestamp, &flags, &i, &pos);
if(len<0)
return AVERROR(EIO);
st = s->streams[i];
if (ff_rm_parse_packet (s, st, len, pkt, &seq, &flags, &timestamp) < 0)
goto resync;
if((flags&2) && (seq&0x7F) == 1)
av_add_index_entry(st, pos, timestamp, 0, 0, AVINDEX_KEYFRAME);
}
return 0;
}
static int rm_read_close(AVFormatContext *s)
{
RMContext *rm = s->priv_data;
av_free(rm->audiobuf);
av_free(rm->videobuf);
return 0;
}
static int rm_probe(AVProbeData *p)
{
/* check file header */
if ((p->buf[0] == '.' && p->buf[1] == 'R' &&
p->buf[2] == 'M' && p->buf[3] == 'F' &&
p->buf[4] == 0 && p->buf[5] == 0) ||
(p->buf[0] == '.' && p->buf[1] == 'r' &&
p->buf[2] == 'a' && p->buf[3] == 0xfd))
return AVPROBE_SCORE_MAX;
else
return 0;
}
static int64_t rm_read_dts(AVFormatContext *s, int stream_index,
int64_t *ppos, int64_t pos_limit)
{
RMContext *rm = s->priv_data;
int64_t pos, dts;
int stream_index2, flags, len, h;
pos = *ppos;
if(rm->old_format)
return AV_NOPTS_VALUE;
url_fseek(s->pb, pos, SEEK_SET);
rm->remaining_len=0;
for(;;){
int seq=1;
AVStream *st;
len=sync(s, &dts, &flags, &stream_index2, &pos);
if(len<0)
return AV_NOPTS_VALUE;
st = s->streams[stream_index2];
if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
h= get_byte(s->pb); len--;
if(!(h & 0x40)){
seq = get_byte(s->pb); len--;
}
}
if((flags&2) && (seq&0x7F) == 1){
// av_log(s, AV_LOG_DEBUG, "%d %d-%d %"PRId64" %d\n", flags, stream_index2, stream_index, dts, seq);
av_add_index_entry(st, pos, dts, 0, 0, AVINDEX_KEYFRAME);
if(stream_index2 == stream_index)
break;
}
url_fskip(s->pb, len);
}
*ppos = pos;
return dts;
}
AVInputFormat rm_demuxer = {
"rm",
NULL_IF_CONFIG_SMALL("RM format"),
sizeof(RMContext),
rm_probe,
rm_read_header,
rm_read_packet,
rm_read_close,
NULL,
rm_read_dts,
};
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