MrBesen/ffmpeg
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

lxf: Support version 1 files

Browse Source 
Signed-off-by: Luca Barbato <lu_zero@gentoo.org>
This commit is contained in:
Reimar Döffinger 2012-03-24 16:47:33 +01:00 committed by Luca Barbato
parent d872fb0f7f
commit 779951cd2c
1 changed files with 59 additions and 34 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

93
libavformat/lxfdec.c
View File

@ -20,10 +20,11 @@
*/
#include "libavutil/intreadwrite.h"
#include "libavcodec/bytestream.h"
#include "avformat.h"
#include "internal.h"
#define LXF_PACKET_HEADER_SIZE 60
#define LXF_MAX_PACKET_HEADER_SIZE 256
#define LXF_HEADER_DATA_SIZE 120
#define LXF_IDENT "LEITCH\0"
#define LXF_IDENT_LENGTH 8
@ -48,6 +49,7 @@ typedef struct {
int channels; ///< number of audio channels. zero means no audio
uint8_t temp[LXF_MAX_AUDIO_PACKET]; ///< temp buffer for de-planarizing the audio data
int frame_number; ///< current video frame
uint32_t video_format, packet_type, extended_size;
} LXFDemuxContext;
static int lxf_probe(AVProbeData *p)
@ -64,12 +66,12 @@ static int lxf_probe(AVProbeData *p)
* @param[in] header the packet header to check
* @return zero if the checksum is OK, non-zero otherwise
*/
static int check_checksum(const uint8_t *header)
static int check_checksum(const uint8_t *header, int size)
{
int x;
uint32_t sum = 0;
for (x = 0; x < LXF_PACKET_HEADER_SIZE; x += 4)
for (x = 0; x < size; x += 4)
sum += AV_RL32(&header[x]);
return sum;
@ -105,40 +107,58 @@ static int sync(AVFormatContext *s, uint8_t *header)
/**
* Read and checksum the next packet header
*
* @param[out] header the read packet header
* @param[out] format context dependent format information
* @return the size of the payload following the header or < 0 on failure
*/
static int get_packet_header(AVFormatContext *s, uint8_t *header, uint32_t *format)
static int get_packet_header(AVFormatContext *s)
{
LXFDemuxContext *lxf = s->priv_data;
AVIOContext *pb = s->pb;
int track_size, samples, ret;
uint32_t version, audio_format, header_size, channels, tmp;
AVStream *st;
uint8_t header[LXF_MAX_PACKET_HEADER_SIZE];
const uint8_t *p = header + LXF_IDENT_LENGTH;
//find and read the ident
if ((ret = sync(s, header)) < 0)
return ret;
//read the rest of the packet header
if ((ret = avio_read(pb, header + LXF_IDENT_LENGTH,
LXF_PACKET_HEADER_SIZE - LXF_IDENT_LENGTH)) !=
LXF_PACKET_HEADER_SIZE - LXF_IDENT_LENGTH) {
ret = avio_read(pb, header + LXF_IDENT_LENGTH, 8);
if (ret != 8)
return ret < 0 ? ret : AVERROR_EOF;
version = bytestream_get_le32(&p);
header_size = bytestream_get_le32(&p);
if (version > 1)
avpriv_request_sample(s, "Unknown format version %i\n", version);
if (header_size < (version ? 72 : 60) ||
header_size > LXF_MAX_PACKET_HEADER_SIZE ||
(header_size & 3)) {
av_log(s, AV_LOG_ERROR, "Invalid header size 0x%x\n", header_size);
return AVERROR_INVALIDDATA;
}
if (check_checksum(header))
//read the rest of the packet header
ret = avio_read(pb, header + (p - header), header_size - (p - header));
if (ret != header_size - (p - header))
return ret < 0 ? ret : AVERROR_EOF;
if (check_checksum(header, header_size))
av_log(s, AV_LOG_ERROR, "checksum error\n");
*format = AV_RL32(&header[32]);
ret = AV_RL32(&header[36]);
lxf->packet_type = bytestream_get_le32(&p);
p += version ? 20 : 12;
//type
switch (AV_RL32(&header[16])) {
lxf->extended_size = 0;
switch (lxf->packet_type) {
case 0:
//video
lxf->video_format = bytestream_get_le32(&p);
ret = bytestream_get_le32(&p);
//skip VBI data and metadata
avio_skip(pb, (int64_t)(uint32_t)AV_RL32(&header[44]) +
(int64_t)(uint32_t)AV_RL32(&header[52]));
avio_skip(pb, (int64_t)(uint32_t)AV_RL32(p + 4) +
(int64_t)(uint32_t)AV_RL32(p + 12));
break;
case 1:
//audio
@ -147,12 +167,17 @@ static int get_packet_header(AVFormatContext *s, uint8_t *header, uint32_t *form
break;
}
if (version == 0)
p += 8;
audio_format = bytestream_get_le32(&p);
channels = bytestream_get_le32(&p);
track_size = bytestream_get_le32(&p);
//set codec based on specified audio bitdepth
//we only support tightly packed 16-, 20-, 24- and 32-bit PCM at the moment
*format = AV_RL32(&header[40]);
st->codec->bits_per_coded_sample = (*format >> 6) & 0x3F;
st->codec->bits_per_coded_sample = (audio_format >> 6) & 0x3F;
if (st->codec->bits_per_coded_sample != (*format & 0x3F)) {
if (st->codec->bits_per_coded_sample != (audio_format & 0x3F)) {
av_log(s, AV_LOG_WARNING, "only tightly packed PCM currently supported\n");
return AVERROR_PATCHWELCOME;
}
@ -168,7 +193,6 @@ static int get_packet_header(AVFormatContext *s, uint8_t *header, uint32_t *form
return AVERROR_PATCHWELCOME;
}
track_size = AV_RL32(&header[48]);
samples = track_size * 8 / st->codec->bits_per_coded_sample;
//use audio packet size to determine video standard
@ -185,10 +209,14 @@ static int get_packet_header(AVFormatContext *s, uint8_t *header, uint32_t *form
}
//TODO: warning if track mask != (1 << channels) - 1?
ret = av_popcount(AV_RL32(&header[44])) * track_size;
ret = av_popcount(channels) * track_size;
break;
default:
tmp = bytestream_get_le32(&p);
ret = bytestream_get_le32(&p);
if (tmp == 1)
lxf->extended_size = bytestream_get_le32(&p);
break;
}
@ -199,13 +227,13 @@ static int lxf_read_header(AVFormatContext *s)
{
LXFDemuxContext *lxf = s->priv_data;
AVIOContext *pb = s->pb;
uint8_t header[LXF_PACKET_HEADER_SIZE], header_data[LXF_HEADER_DATA_SIZE];
uint8_t header_data[LXF_HEADER_DATA_SIZE];
int ret;
AVStream *st;
uint32_t format, video_params, disk_params;
uint32_t video_params, disk_params;
uint16_t record_date, expiration_date;
if ((ret = get_packet_header(s, header, &format)) < 0)
if ((ret = get_packet_header(s)) < 0)
return ret;
if (ret != LXF_HEADER_DATA_SIZE) {
@ -253,10 +281,7 @@ static int lxf_read_header(AVFormatContext *s)
avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
}
if (format == 1) {
//skip extended field data
avio_skip(s->pb, (uint32_t)AV_RL32(&header[40]));
}
avio_skip(s->pb, lxf->extended_size);
return 0;
}
@ -282,15 +307,15 @@ static int lxf_read_packet(AVFormatContext *s, AVPacket *pkt)
{
LXFDemuxContext *lxf = s->priv_data;
AVIOContext *pb = s->pb;
uint8_t header[LXF_PACKET_HEADER_SIZE], *buf;
uint8_t *buf;
AVStream *ast = NULL;
uint32_t stream, format;
uint32_t stream;
int ret, ret2;
if ((ret = get_packet_header(s, header, &format)) < 0)
if ((ret = get_packet_header(s)) < 0)
return ret;
stream = AV_RL32(&header[16]);
stream = lxf->packet_type;
if (stream > 1) {
av_log(s, AV_LOG_WARNING, "got packet with illegal stream index %u\n", stream);
@ -327,7 +352,7 @@ static int lxf_read_packet(AVFormatContext *s, AVPacket *pkt)
deplanarize(lxf, ast, pkt->data, ret);
} else {
//picture type (0 = closed I, 1 = open I, 2 = P, 3 = B)
if (((format >> 22) & 0x3) < 2)
if (((lxf->video_format >> 22) & 0x3) < 2)
pkt->flags |= AV_PKT_FLAG_KEY;
pkt->dts = lxf->frame_number++;