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ffmpeg/libavformat/rmdec.c
Ronald S. Bultje aac07a7a4c rm: prevent infinite loops for index parsing. 
Specifically, prevent jumping back in the file for the next index, since
this can lead to infinite loops where we jump between indexes referring
to each other, and don't read indexes that don't fit in the file.

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC: libav-stable@libav.org
2012-02-22 12:00:23 -08:00

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/*
* "Real" compatible demuxer.
* Copyright (c) 2000, 2001 Fabrice Bellard
*
* This file is part of Libav.
*
* Libav 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.
*
* Libav 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 Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "libavutil/avstring.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/dict.h"
#include "avformat.h"
#include "internal.h"
#include "riff.h"
#include "rm.h"
#define DEINT_ID_GENR MKTAG('g', 'e', 'n', 'r') ///< interleaving for Cooker/Atrac
#define DEINT_ID_INT0 MKTAG('I', 'n', 't', '0') ///< no interleaving needed
#define DEINT_ID_INT4 MKTAG('I', 'n', 't', '4') ///< interleaving for 28.8
#define DEINT_ID_SIPR MKTAG('s', 'i', 'p', 'r') ///< interleaving for Sipro
#define DEINT_ID_VBRF MKTAG('v', 'b', 'r', 'f') ///< VBR case for AAC
#define DEINT_ID_VBRS MKTAG('v', 'b', 'r', 's') ///< VBR case for AAC
struct RMStream {
AVPacket pkt; ///< place to store merged video frame / reordered audio data
int videobufsize; ///< current assembled frame size
int videobufpos; ///< position for the next slice in the video buffer
int curpic_num; ///< picture number of current frame
int cur_slice, slices;
int64_t pktpos; ///< first slice position in file
/// Audio descrambling matrix parameters
int64_t audiotimestamp; ///< Audio packet timestamp
int sub_packet_cnt; // Subpacket counter, used while reading
int sub_packet_size, sub_packet_h, coded_framesize; ///< Descrambling parameters from container
int audio_framesize; /// Audio frame size from container
int sub_packet_lengths[16]; /// Length of each subpacket
int32_t deint_id; ///< deinterleaver used in audio stream
};
typedef struct {
int nb_packets;
int old_format;
int current_stream;
int remaining_len;
int audio_stream_num; ///< Stream number for audio packets
int audio_pkt_cnt; ///< Output packet counter
} RMDemuxContext;
static const unsigned char sipr_swaps[38][2] = {
{ 0, 63 }, { 1, 22 }, { 2, 44 }, { 3, 90 },
{ 5, 81 }, { 7, 31 }, { 8, 86 }, { 9, 58 },
{ 10, 36 }, { 12, 68 }, { 13, 39 }, { 14, 73 },
{ 15, 53 }, { 16, 69 }, { 17, 57 }, { 19, 88 },
{ 20, 34 }, { 21, 71 }, { 24, 46 }, { 25, 94 },
{ 26, 54 }, { 28, 75 }, { 29, 50 }, { 32, 70 },
{ 33, 92 }, { 35, 74 }, { 38, 85 }, { 40, 56 },
{ 42, 87 }, { 43, 65 }, { 45, 59 }, { 48, 79 },
{ 49, 93 }, { 51, 89 }, { 55, 95 }, { 61, 76 },
{ 67, 83 }, { 77, 80 }
};
const unsigned char ff_sipr_subpk_size[4] = { 29, 19, 37, 20 };
static inline void get_strl(AVIOContext *pb, char *buf, int buf_size, int len)
{
int i;
char *q, r;
q = buf;
for(i=0;i<len;i++) {
r = avio_r8(pb);
if (i < buf_size - 1)
*q++ = r;
}
if (buf_size > 0) *q = '\0';
}
static void get_str8(AVIOContext *pb, char *buf, int buf_size)
{
get_strl(pb, buf, buf_size, avio_r8(pb));
}
static int rm_read_extradata(AVIOContext *pb, AVCodecContext *avctx, unsigned size)
{
if (size >= 1<<24)
return -1;
avctx->extradata = av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE);
if (!avctx->extradata)
return AVERROR(ENOMEM);
avctx->extradata_size = avio_read(pb, avctx->extradata, size);
memset(avctx->extradata + avctx->extradata_size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
if (avctx->extradata_size != size)
return AVERROR(EIO);
return 0;
}
static void rm_read_metadata(AVFormatContext *s, int wide)
{
char buf[1024];
int i;
for (i=0; i<FF_ARRAY_ELEMS(ff_rm_metadata); i++) {
int len = wide ? avio_rb16(s->pb) : avio_r8(s->pb);
get_strl(s->pb, buf, sizeof(buf), len);
av_dict_set(&s->metadata, ff_rm_metadata[i], buf, 0);
}
}
RMStream *ff_rm_alloc_rmstream (void)
{
RMStream *rms = av_mallocz(sizeof(RMStream));
rms->curpic_num = -1;
return rms;
}
void ff_rm_free_rmstream (RMStream *rms)
{
av_free_packet(&rms->pkt);
}
static int rm_read_audio_stream_info(AVFormatContext *s, AVIOContext *pb,
AVStream *st, RMStream *ast, int read_all)
{
char buf[256];
uint32_t version;
int ret;
/* ra type header */
version = avio_rb16(pb); /* version */
if (version == 3) {
int header_size = avio_rb16(pb);
int64_t startpos = avio_tell(pb);
avio_skip(pb, 14);
rm_read_metadata(s, 0);
if ((startpos + header_size) >= avio_tell(pb) + 2) {
// fourcc (should always be "lpcJ")
avio_r8(pb);
get_str8(pb, buf, sizeof(buf));
}
// Skip extra header crap (this should never happen)
if ((startpos + header_size) > avio_tell(pb))
avio_skip(pb, header_size + startpos - avio_tell(pb));
st->codec->sample_rate = 8000;
st->codec->channels = 1;
st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
st->codec->codec_id = CODEC_ID_RA_144;
ast->deint_id = DEINT_ID_INT0;
} else {
int flavor, sub_packet_h, coded_framesize, sub_packet_size;
int codecdata_length;
/* old version (4) */
avio_skip(pb, 2); /* unused */
avio_rb32(pb); /* .ra4 */
avio_rb32(pb); /* data size */
avio_rb16(pb); /* version2 */
avio_rb32(pb); /* header size */
flavor= avio_rb16(pb); /* add codec info / flavor */
ast->coded_framesize = coded_framesize = avio_rb32(pb); /* coded frame size */
avio_rb32(pb); /* ??? */
avio_rb32(pb); /* ??? */
avio_rb32(pb); /* ??? */
ast->sub_packet_h = sub_packet_h = avio_rb16(pb); /* 1 */
st->codec->block_align= avio_rb16(pb); /* frame size */
ast->sub_packet_size = sub_packet_size = avio_rb16(pb); /* sub packet size */
avio_rb16(pb); /* ??? */
if (version == 5) {
avio_rb16(pb); avio_rb16(pb); avio_rb16(pb);
}
st->codec->sample_rate = avio_rb16(pb);
avio_rb32(pb);
st->codec->channels = avio_rb16(pb);
if (version == 5) {
ast->deint_id = avio_rl32(pb);
avio_read(pb, buf, 4);
buf[4] = 0;
} else {
get_str8(pb, buf, sizeof(buf)); /* desc */
ast->deint_id = AV_RL32(buf);
get_str8(pb, buf, sizeof(buf)); /* desc */
}
st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
st->codec->codec_tag = AV_RL32(buf);
st->codec->codec_id = ff_codec_get_id(ff_rm_codec_tags,
st->codec->codec_tag);
switch (st->codec->codec_id) {
case CODEC_ID_AC3:
st->need_parsing = AVSTREAM_PARSE_FULL;
break;
case CODEC_ID_RA_288:
st->codec->extradata_size= 0;
ast->audio_framesize = st->codec->block_align;
st->codec->block_align = coded_framesize;
break;
case CODEC_ID_COOK:
case CODEC_ID_ATRAC3:
case CODEC_ID_SIPR:
avio_rb16(pb); avio_r8(pb);
if (version == 5)
avio_r8(pb);
codecdata_length = avio_rb32(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;
}
ast->audio_framesize = st->codec->block_align;
if (st->codec->codec_id == CODEC_ID_SIPR) {
if (flavor > 3) {
av_log(s, AV_LOG_ERROR, "bad SIPR file flavor %d\n",
flavor);
return -1;
}
st->codec->block_align = ff_sipr_subpk_size[flavor];
} else {
if(sub_packet_size <= 0){
av_log(s, AV_LOG_ERROR, "sub_packet_size is invalid\n");
return -1;
}
st->codec->block_align = ast->sub_packet_size;
}
if ((ret = rm_read_extradata(pb, st->codec, codecdata_length)) < 0)
return ret;
break;
case CODEC_ID_AAC:
avio_rb16(pb); avio_r8(pb);
if (version == 5)
avio_r8(pb);
codecdata_length = avio_rb32(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) {
avio_r8(pb);
if ((ret = rm_read_extradata(pb, st->codec, codecdata_length - 1)) < 0)
return ret;
}
break;
default:
av_strlcpy(st->codec->codec_name, buf, sizeof(st->codec->codec_name));
}
if (ast->deint_id == DEINT_ID_INT4 ||
ast->deint_id == DEINT_ID_GENR ||
ast->deint_id == DEINT_ID_SIPR) {
if (st->codec->block_align <= 0 ||
ast->audio_framesize * sub_packet_h > (unsigned)INT_MAX ||
ast->audio_framesize * sub_packet_h < st->codec->block_align)
return AVERROR_INVALIDDATA;
if (av_new_packet(&ast->pkt, ast->audio_framesize * sub_packet_h) < 0)
return AVERROR(ENOMEM);
}
switch (ast->deint_id) {
case DEINT_ID_INT4:
if (ast->coded_framesize > ast->audio_framesize ||
sub_packet_h <= 1 ||
ast->coded_framesize * sub_packet_h > (2 + (sub_packet_h & 1)) * ast->audio_framesize)
return AVERROR_INVALIDDATA;
break;
case DEINT_ID_GENR:
if (ast->sub_packet_size <= 0 ||
ast->sub_packet_size > ast->audio_framesize)
return AVERROR_INVALIDDATA;
break;
case DEINT_ID_SIPR:
case DEINT_ID_INT0:
case DEINT_ID_VBRS:
case DEINT_ID_VBRF:
break;
default:
av_log(NULL,0,"Unknown interleaver %X\n", ast->deint_id);
return AVERROR_INVALIDDATA;
}
if (read_all) {
avio_r8(pb);
avio_r8(pb);
avio_r8(pb);
rm_read_metadata(s, 0);
}
}
return 0;
}
int
ff_rm_read_mdpr_codecdata (AVFormatContext *s, AVIOContext *pb,
AVStream *st, RMStream *rst, int codec_data_size)
{
unsigned int v;
int size;
int64_t codec_pos;
int ret;
avpriv_set_pts_info(st, 64, 1, 1000);
codec_pos = avio_tell(pb);
v = avio_rb32(pb);
if (v == MKTAG(0xfd, 'a', 'r', '.')) {
/* ra type header */
if (rm_read_audio_stream_info(s, pb, st, rst, 0))
return -1;
} else {
int fps;
if (avio_rl32(pb) != MKTAG('V', 'I', 'D', 'O')) {
fail1:
av_log(st->codec, AV_LOG_ERROR, "Unsupported video codec\n");
goto skip;
}
st->codec->codec_tag = avio_rl32(pb);
st->codec->codec_id = ff_codec_get_id(ff_rm_codec_tags,
st->codec->codec_tag);
// av_log(s, AV_LOG_DEBUG, "%X %X\n", st->codec->codec_tag, MKTAG('R', 'V', '2', '0'));
if (st->codec->codec_id == CODEC_ID_NONE)
goto fail1;
st->codec->width = avio_rb16(pb);
st->codec->height = avio_rb16(pb);
avio_skip(pb, 2); // looks like bits per sample
avio_skip(pb, 4); // always zero?
st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;
fps = avio_rb32(pb);
if ((ret = rm_read_extradata(pb, st->codec, codec_data_size - (avio_tell(pb) - codec_pos))) < 0)
return ret;
av_reduce(&st->r_frame_rate.den, &st->r_frame_rate.num,
0x10000, fps, (1 << 30) - 1);
st->avg_frame_rate = st->r_frame_rate;
}
skip:
/* skip codec info */
size = avio_tell(pb) - codec_pos;
avio_skip(pb, codec_data_size - size);
return 0;
}
/** this function assumes that the demuxer has already seeked to the start
* of the INDX chunk, and will bail out if not. */
static int rm_read_index(AVFormatContext *s)
{
AVIOContext *pb = s->pb;
unsigned int size, n_pkts, str_id, next_off, n, pos, pts;
AVStream *st;
do {
if (avio_rl32(pb) != MKTAG('I','N','D','X'))
return -1;
size = avio_rb32(pb);
if (size < 20)
return -1;
avio_skip(pb, 2);
n_pkts = avio_rb32(pb);
str_id = avio_rb16(pb);
next_off = avio_rb32(pb);
for (n = 0; n < s->nb_streams; n++)
if (s->streams[n]->id == str_id) {
st = s->streams[n];
break;
}
if (n == s->nb_streams) {
av_log(s, AV_LOG_ERROR,
"Invalid stream index %d for index at pos %"PRId64"\n",
str_id, avio_tell(pb));
goto skip;
} else if ((avio_size(pb) - avio_tell(pb)) / 14 < n_pkts) {
av_log(s, AV_LOG_ERROR,
"Nr. of packets in packet index for stream index %d "
"exceeds filesize (%"PRId64" at %"PRId64" = %d)\n",
str_id, avio_size(pb), avio_tell(pb),
(avio_size(pb) - avio_tell(pb)) / 14);
goto skip;
}
for (n = 0; n < n_pkts; n++) {
avio_skip(pb, 2);
pts = avio_rb32(pb);
pos = avio_rb32(pb);
avio_skip(pb, 4); /* packet no. */
av_add_index_entry(st, pos, pts, 0, 0, AVINDEX_KEYFRAME);
}
skip:
if (next_off && avio_tell(pb) < next_off &&
avio_seek(pb, next_off, SEEK_SET) < 0) {
av_log(s, AV_LOG_ERROR,
"Non-linear index detected, not supported\n");
return -1;
}
} while (next_off);
return 0;
}
static int rm_read_header_old(AVFormatContext *s)
{
RMDemuxContext *rm = s->priv_data;
AVStream *st;
rm->old_format = 1;
st = avformat_new_stream(s, NULL);
if (!st)
return -1;
st->priv_data = ff_rm_alloc_rmstream();
return rm_read_audio_stream_info(s, s->pb, st, st->priv_data, 1);
}
static int rm_read_header(AVFormatContext *s)
{
RMDemuxContext *rm = s->priv_data;
AVStream *st;
AVIOContext *pb = s->pb;
unsigned int tag;
int tag_size;
unsigned int start_time, duration;
unsigned int data_off = 0, indx_off = 0;
char buf[128];
int flags = 0;
tag = avio_rl32(pb);
if (tag == MKTAG('.', 'r', 'a', 0xfd)) {
/* very old .ra format */
return rm_read_header_old(s);
} else if (tag != MKTAG('.', 'R', 'M', 'F')) {
return AVERROR(EIO);
}
avio_rb32(pb); /* header size */
avio_rb16(pb);
avio_rb32(pb);
avio_rb32(pb); /* number of headers */
for(;;) {
if (pb->eof_reached)
return -1;
tag = avio_rl32(pb);
tag_size = avio_rb32(pb);
avio_rb16(pb);
av_dlog(s, "tag=%c%c%c%c (%08x) size=%d\n",
(tag ) & 0xff,
(tag >> 8) & 0xff,
(tag >> 16) & 0xff,
(tag >> 24) & 0xff,
tag,
tag_size);
if (tag_size < 10 && tag != MKTAG('D', 'A', 'T', 'A'))
return -1;
switch(tag) {
case MKTAG('P', 'R', 'O', 'P'):
/* file header */
avio_rb32(pb); /* max bit rate */
avio_rb32(pb); /* avg bit rate */
avio_rb32(pb); /* max packet size */
avio_rb32(pb); /* avg packet size */
avio_rb32(pb); /* nb packets */
avio_rb32(pb); /* duration */
avio_rb32(pb); /* preroll */
indx_off = avio_rb32(pb); /* index offset */
data_off = avio_rb32(pb); /* data offset */
avio_rb16(pb); /* nb streams */
flags = avio_rb16(pb); /* flags */
break;
case MKTAG('C', 'O', 'N', 'T'):
rm_read_metadata(s, 1);
break;
case MKTAG('M', 'D', 'P', 'R'):
st = avformat_new_stream(s, NULL);
if (!st)
return AVERROR(ENOMEM);
st->id = avio_rb16(pb);
avio_rb32(pb); /* max bit rate */
st->codec->bit_rate = avio_rb32(pb); /* bit rate */
avio_rb32(pb); /* max packet size */
avio_rb32(pb); /* avg packet size */
start_time = avio_rb32(pb); /* start time */
avio_rb32(pb); /* preroll */
duration = avio_rb32(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 = AVMEDIA_TYPE_DATA;
st->priv_data = ff_rm_alloc_rmstream();
if (ff_rm_read_mdpr_codecdata(s, s->pb, st, st->priv_data,
avio_rb32(pb)) < 0)
return -1;
break;
case MKTAG('D', 'A', 'T', 'A'):
goto header_end;
default:
/* unknown tag: skip it */
avio_skip(pb, tag_size - 10);
break;
}
}
header_end:
rm->nb_packets = avio_rb32(pb); /* number of packets */
if (!rm->nb_packets && (flags & 4))
rm->nb_packets = 3600 * 25;
avio_rb32(pb); /* next data header */
if (!data_off)
data_off = avio_tell(pb) - 18;
if (indx_off && pb->seekable && !(s->flags & AVFMT_FLAG_IGNIDX) &&
avio_seek(pb, indx_off, SEEK_SET) >= 0) {
rm_read_index(s);
avio_seek(pb, data_off + 18, SEEK_SET);
}
return 0;
}
static int get_num(AVIOContext *pb, int *len)
{
int n, n1;
n = avio_rb16(pb);
(*len)-=2;
n &= 0x7FFF;
if (n >= 0x4000) {
return n - 0x4000;
} else {
n1 = avio_rb16(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){
RMDemuxContext *rm = s->priv_data;
AVIOContext *pb = s->pb;
AVStream *st;
uint32_t state=0xFFFFFFFF;
while(!pb->eof_reached){
int len, num, i;
*pos= avio_tell(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) + avio_r8(pb);
if(state == MKBETAG('I', 'N', 'D', 'X')){
int n_pkts, expected_len;
len = avio_rb32(pb);
avio_skip(pb, 2);
n_pkts = avio_rb32(pb);
expected_len = 20 + n_pkts * 14;
if (len == 20)
/* some files don't add index entries to chunk size... */
len = expected_len;
else if (len != expected_len)
av_log(s, AV_LOG_WARNING,
"Index size %d (%d pkts) is wrong, should be %d.\n",
len, n_pkts, expected_len);
len -= 14; // we already read part of the index header
if(len<0)
continue;
goto skip;
} else if (state == MKBETAG('D','A','T','A')) {
av_log(s, AV_LOG_WARNING,
"DATA tag in middle of chunk, file may be broken.\n");
}
if(state > (unsigned)0xFFFF || state <= 12)
continue;
len=state - 12;
state= 0xFFFFFFFF;
num = avio_rb16(pb);
*timestamp = avio_rb32(pb);
avio_r8(pb); /* reserved */
*flags = avio_r8(pb); /* flags */
}
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 */
avio_skip(pb, len);
rm->remaining_len = 0;
continue;
}
*stream_index= i;
return len;
}
return -1;
}
static int rm_assemble_video_frame(AVFormatContext *s, AVIOContext *pb,
RMDemuxContext *rm, RMStream *vst,
AVPacket *pkt, int len, int *pseq,
int64_t *timestamp)
{
int hdr, seq, pic_num, len2, pos;
int type;
hdr = avio_r8(pb); len--;
type = hdr >> 6;
if(type != 3){ // not frame as a part of packet
seq = avio_r8(pb); len--;
}
if(type != 1){ // not whole frame
len2 = get_num(pb, &len);
pos = get_num(pb, &len);
pic_num = avio_r8(pb); len--;
}
if(len<0)
return -1;
rm->remaining_len = len;
if(type&1){ // frame, not slice
if(type == 3){ // frame as a part of packet
len= len2;
*timestamp = pos;
}
if(rm->remaining_len < len)
return -1;
rm->remaining_len -= 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);
avio_read(pb, pkt->data + 9, len);
return 0;
}
//now we have to deal with single slice
*pseq = seq;
if((seq & 0x7F) == 1 || vst->curpic_num != pic_num){
vst->slices = ((hdr & 0x3F) << 1) + 1;
vst->videobufsize = len2 + 8*vst->slices + 1;
av_free_packet(&vst->pkt); //FIXME this should be output.
if(av_new_packet(&vst->pkt, vst->videobufsize) < 0)
return AVERROR(ENOMEM);
vst->videobufpos = 8*vst->slices + 1;
vst->cur_slice = 0;
vst->curpic_num = pic_num;
vst->pktpos = avio_tell(pb);
}
if(type == 2)
len = FFMIN(len, pos);
if(++vst->cur_slice > vst->slices)
return 1;
AV_WL32(vst->pkt.data - 7 + 8*vst->cur_slice, 1);
AV_WL32(vst->pkt.data - 3 + 8*vst->cur_slice, vst->videobufpos - 8*vst->slices - 1);
if(vst->videobufpos + len > vst->videobufsize)
return 1;
if (avio_read(pb, vst->pkt.data + vst->videobufpos, len) != len)
return AVERROR(EIO);
vst->videobufpos += len;
rm->remaining_len-= len;
if (type == 2 || vst->videobufpos == vst->videobufsize) {
vst->pkt.data[0] = vst->cur_slice-1;
*pkt= vst->pkt;
vst->pkt.data= NULL;
vst->pkt.size= 0;
if(vst->slices != vst->cur_slice) //FIXME find out how to set slices correct from the begin
memmove(pkt->data + 1 + 8*vst->cur_slice, pkt->data + 1 + 8*vst->slices,
vst->videobufpos - 1 - 8*vst->slices);
pkt->size = vst->videobufpos + 8*(vst->cur_slice - vst->slices);
pkt->pts = AV_NOPTS_VALUE;
pkt->pos = vst->pktpos;
vst->slices = 0;
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;
}
}
}
/**
* Perform 4-bit block reordering for SIPR data.
* @todo This can be optimized, e.g. use memcpy() if data blocks are aligned
*/
void ff_rm_reorder_sipr_data(uint8_t *buf, int sub_packet_h, int framesize)
{
int n, bs = sub_packet_h * framesize * 2 / 96; // nibbles per subpacket
for (n = 0; n < 38; n++) {
int j;
int i = bs * sipr_swaps[n][0];
int o = bs * sipr_swaps[n][1];
/* swap 4bit-nibbles of block 'i' with 'o' */
for (j = 0; j < bs; j++, i++, o++) {
int x = (buf[i >> 1] >> (4 * (i & 1))) & 0xF,
y = (buf[o >> 1] >> (4 * (o & 1))) & 0xF;
buf[o >> 1] = (x << (4 * (o & 1))) |
(buf[o >> 1] & (0xF << (4 * !(o & 1))));
buf[i >> 1] = (y << (4 * (i & 1))) |
(buf[i >> 1] & (0xF << (4 * !(i & 1))));
}
}
}
int
ff_rm_parse_packet (AVFormatContext *s, AVIOContext *pb,
AVStream *st, RMStream *ast, int len, AVPacket *pkt,
int *seq, int flags, int64_t timestamp)
{
RMDemuxContext *rm = s->priv_data;
if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
rm->current_stream= st->id;
if(rm_assemble_video_frame(s, pb, rm, ast, pkt, len, seq, &timestamp))
return -1; //got partial frame
} else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
if ((ast->deint_id == DEINT_ID_GENR) ||
(ast->deint_id == DEINT_ID_INT4) ||
(ast->deint_id == DEINT_ID_SIPR)) {
int x;
int sps = ast->sub_packet_size;
int cfs = ast->coded_framesize;
int h = ast->sub_packet_h;
int y = ast->sub_packet_cnt;
int w = ast->audio_framesize;
if (flags & 2)
y = ast->sub_packet_cnt = 0;
if (!y)
ast->audiotimestamp = timestamp;
switch (ast->deint_id) {
case DEINT_ID_INT4:
for (x = 0; x < h/2; x++)
avio_read(pb, ast->pkt.data+x*2*w+y*cfs, cfs);
break;
case DEINT_ID_GENR:
for (x = 0; x < w/sps; x++)
avio_read(pb, ast->pkt.data+sps*(h*x+((h+1)/2)*(y&1)+(y>>1)), sps);
break;
case DEINT_ID_SIPR:
avio_read(pb, ast->pkt.data + y * w, w);
break;
}
if (++(ast->sub_packet_cnt) < h)
return -1;
if (ast->deint_id == DEINT_ID_SIPR)
ff_rm_reorder_sipr_data(ast->pkt.data, h, w);
ast->sub_packet_cnt = 0;
rm->audio_stream_num = st->index;
rm->audio_pkt_cnt = h * w / st->codec->block_align;
} else if ((ast->deint_id == DEINT_ID_VBRF) ||
(ast->deint_id == DEINT_ID_VBRS)) {
int x;
rm->audio_stream_num = st->index;
ast->sub_packet_cnt = (avio_rb16(pb) & 0xf0) >> 4;
if (ast->sub_packet_cnt) {
for (x = 0; x < ast->sub_packet_cnt; x++)
ast->sub_packet_lengths[x] = avio_rb16(pb);
rm->audio_pkt_cnt = ast->sub_packet_cnt;
ast->audiotimestamp = timestamp;
} else
return -1;
} else {
av_get_packet(pb, pkt, len);
rm_ac3_swap_bytes(st, pkt);
}
} else
av_get_packet(pb, pkt, len);
pkt->stream_index = st->index;
#if 0
if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
if(st->codec->codec_id == CODEC_ID_RV20){
int seq= 128*(pkt->data[2]&0x7F) + (pkt->data[3]>>1);
av_log(s, 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 |= AV_PKT_FLAG_KEY;
return st->codec->codec_type == AVMEDIA_TYPE_AUDIO ? rm->audio_pkt_cnt : 0;
}
int
ff_rm_retrieve_cache (AVFormatContext *s, AVIOContext *pb,
AVStream *st, RMStream *ast, AVPacket *pkt)
{
RMDemuxContext *rm = s->priv_data;
assert (rm->audio_pkt_cnt > 0);
if (ast->deint_id == DEINT_ID_VBRF ||
ast->deint_id == DEINT_ID_VBRS)
av_get_packet(pb, pkt, ast->sub_packet_lengths[ast->sub_packet_cnt - rm->audio_pkt_cnt]);
else {
av_new_packet(pkt, st->codec->block_align);
memcpy(pkt->data, ast->pkt.data + st->codec->block_align * //FIXME avoid this
(ast->sub_packet_h * ast->audio_framesize / st->codec->block_align - rm->audio_pkt_cnt),
st->codec->block_align);
}
rm->audio_pkt_cnt--;
if ((pkt->pts = ast->audiotimestamp) != AV_NOPTS_VALUE) {
ast->audiotimestamp = AV_NOPTS_VALUE;
pkt->flags = AV_PKT_FLAG_KEY;
} else
pkt->flags = 0;
pkt->stream_index = st->index;
return rm->audio_pkt_cnt;
}
static int rm_read_packet(AVFormatContext *s, AVPacket *pkt)
{
RMDemuxContext *rm = s->priv_data;
AVStream *st;
int i, len, res, seq = 1;
int64_t timestamp, pos;
int flags;
for (;;) {
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, s->pb, st, st->priv_data, pkt);
flags = 0;
} else {
if (rm->old_format) {
RMStream *ast;
st = s->streams[0];
ast = st->priv_data;
timestamp = AV_NOPTS_VALUE;
len = !ast->audio_framesize ? RAW_PACKET_SIZE :
ast->coded_framesize * ast->sub_packet_h / 2;
flags = (seq++ == 1) ? 2 : 0;
pos = avio_tell(s->pb);
} else {
len=sync(s, &timestamp, &flags, &i, &pos);
if (len > 0)
st = s->streams[i];
}
if(len<0 || s->pb->eof_reached)
return AVERROR(EIO);
res = ff_rm_parse_packet (s, s->pb, st, st->priv_data, len, pkt,
&seq, flags, timestamp);
if((flags&2) && (seq&0x7F) == 1)
av_add_index_entry(st, pos, timestamp, 0, 0, AVINDEX_KEYFRAME);
if (res)
continue;
}
if( (st->discard >= AVDISCARD_NONKEY && !(flags&2))
|| st->discard >= AVDISCARD_ALL){
av_free_packet(pkt);
} else
break;
}
return 0;
}
static int rm_read_close(AVFormatContext *s)
{
int i;
for (i=0;i<s->nb_streams;i++)
ff_rm_free_rmstream(s->streams[i]->priv_data);
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)
{
RMDemuxContext *rm = s->priv_data;
int64_t pos, dts;
int stream_index2, flags, len, h;
pos = *ppos;
if(rm->old_format)
return AV_NOPTS_VALUE;
avio_seek(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 == AVMEDIA_TYPE_VIDEO) {
h= avio_r8(s->pb); len--;
if(!(h & 0x40)){
seq = avio_r8(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;
}
avio_skip(s->pb, len);
}
*ppos = pos;
return dts;
}
AVInputFormat ff_rm_demuxer = {
.name = "rm",
.long_name = NULL_IF_CONFIG_SMALL("RealMedia format"),
.priv_data_size = sizeof(RMDemuxContext),
.read_probe = rm_probe,
.read_header = rm_read_header,
.read_packet = rm_read_packet,
.read_close = rm_read_close,
.read_timestamp = rm_read_dts,
};
AVInputFormat ff_rdt_demuxer = {
.name = "rdt",
.long_name = NULL_IF_CONFIG_SMALL("RDT demuxer"),
.priv_data_size = sizeof(RMDemuxContext),
.read_close = rm_read_close,
.flags = AVFMT_NOFILE,
};
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