326 lines
9.0 KiB
C
326 lines
9.0 KiB
C
/*
|
|
* Vivo stream demuxer
|
|
* Copyright (c) 2009 Daniel Verkamp <daniel at drv.nu>
|
|
*
|
|
* 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
|
|
*/
|
|
|
|
/**
|
|
* @file
|
|
* @brief Vivo stream demuxer
|
|
* @author Daniel Verkamp <daniel at drv.nu>
|
|
* @sa http://wiki.multimedia.cx/index.php?title=Vivo
|
|
*/
|
|
|
|
#include "libavutil/avstring.h"
|
|
#include "libavutil/parseutils.h"
|
|
#include "avformat.h"
|
|
#include "internal.h"
|
|
|
|
typedef struct VivoContext {
|
|
int version;
|
|
|
|
int type;
|
|
int sequence;
|
|
int length;
|
|
int duration;
|
|
|
|
uint8_t text[1024 + 1];
|
|
} VivoContext;
|
|
|
|
static int vivo_probe(const AVProbeData *p)
|
|
{
|
|
const unsigned char *buf = p->buf;
|
|
unsigned c, length = 0;
|
|
|
|
// stream must start with packet of type 0 and sequence number 0
|
|
if (*buf++ != 0)
|
|
return 0;
|
|
|
|
// read at most 2 bytes of coded length
|
|
c = *buf++;
|
|
length = c & 0x7F;
|
|
if (c & 0x80) {
|
|
c = *buf++;
|
|
length = (length << 7) | (c & 0x7F);
|
|
}
|
|
if (c & 0x80 || length > 1024 || length < 21)
|
|
return 0;
|
|
|
|
buf += 2;
|
|
if (memcmp(buf, "Version:Vivo/", 13))
|
|
return 0;
|
|
buf += 13;
|
|
|
|
if (*buf < '0' || *buf > '2')
|
|
return 0;
|
|
|
|
return AVPROBE_SCORE_MAX;
|
|
}
|
|
|
|
static int vivo_get_packet_header(AVFormatContext *s)
|
|
{
|
|
VivoContext *vivo = s->priv_data;
|
|
AVIOContext *pb = s->pb;
|
|
unsigned c, get_length = 0;
|
|
|
|
if (avio_feof(pb))
|
|
return AVERROR_EOF;
|
|
|
|
c = avio_r8(pb);
|
|
if (c == 0x82) {
|
|
get_length = 1;
|
|
c = avio_r8(pb);
|
|
}
|
|
|
|
vivo->type = c >> 4;
|
|
vivo->sequence = c & 0xF;
|
|
|
|
switch (vivo->type) {
|
|
case 0: get_length = 1; break;
|
|
case 1: vivo->length = 128; break;
|
|
case 2: get_length = 1; break;
|
|
case 3: vivo->length = 40; break;
|
|
case 4: vivo->length = 24; break;
|
|
default:
|
|
av_log(s, AV_LOG_ERROR, "unknown packet type %d\n", vivo->type);
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
if (get_length) {
|
|
c = avio_r8(pb);
|
|
vivo->length = c & 0x7F;
|
|
if (c & 0x80) {
|
|
c = avio_r8(pb);
|
|
vivo->length = (vivo->length << 7) | (c & 0x7F);
|
|
|
|
if (c & 0x80) {
|
|
av_log(s, AV_LOG_ERROR, "coded length is more than two bytes\n");
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int vivo_read_header(AVFormatContext *s)
|
|
{
|
|
VivoContext *vivo = s->priv_data;
|
|
AVRational fps = { 0 };
|
|
AVStream *ast, *vst;
|
|
unsigned char *line, *line_end, *key, *value;
|
|
long value_int;
|
|
int ret, value_used;
|
|
int64_t duration = 0;
|
|
char *end_value;
|
|
|
|
vst = avformat_new_stream(s, NULL);
|
|
ast = avformat_new_stream(s, NULL);
|
|
if (!ast || !vst)
|
|
return AVERROR(ENOMEM);
|
|
|
|
ast->codecpar->sample_rate = 8000;
|
|
|
|
while (1) {
|
|
if ((ret = vivo_get_packet_header(s)) < 0)
|
|
return ret;
|
|
|
|
// done reading all text header packets?
|
|
if (vivo->sequence || vivo->type)
|
|
break;
|
|
|
|
if (vivo->length <= 1024) {
|
|
avio_read(s->pb, vivo->text, vivo->length);
|
|
vivo->text[vivo->length] = 0;
|
|
} else {
|
|
av_log(s, AV_LOG_WARNING, "too big header, skipping\n");
|
|
avio_skip(s->pb, vivo->length);
|
|
continue;
|
|
}
|
|
|
|
line = vivo->text;
|
|
while (*line) {
|
|
line_end = strstr(line, "\r\n");
|
|
if (!line_end)
|
|
break;
|
|
|
|
*line_end = 0;
|
|
key = line;
|
|
line = line_end + 2; // skip \r\n
|
|
|
|
if (line_end == key) // skip blank lines
|
|
continue;
|
|
|
|
value = strchr(key, ':');
|
|
if (!value) {
|
|
av_log(s, AV_LOG_WARNING, "missing colon in key:value pair '%s'\n",
|
|
key);
|
|
continue;
|
|
}
|
|
|
|
*value++ = 0;
|
|
|
|
av_log(s, AV_LOG_DEBUG, "header: '%s' = '%s'\n", key, value);
|
|
|
|
value_int = strtol(value, &end_value, 10);
|
|
value_used = 0;
|
|
if (*end_value == 0) { // valid integer
|
|
av_log(s, AV_LOG_DEBUG, "got a valid integer (%ld)\n", value_int);
|
|
value_used = 1;
|
|
if (!strcmp(key, "Duration")) {
|
|
duration = value_int;
|
|
} else if (!strcmp(key, "Width")) {
|
|
vst->codecpar->width = value_int;
|
|
} else if (!strcmp(key, "Height")) {
|
|
vst->codecpar->height = value_int;
|
|
} else if (!strcmp(key, "TimeUnitNumerator")) {
|
|
fps.num = value_int / 1000;
|
|
} else if (!strcmp(key, "TimeUnitDenominator")) {
|
|
fps.den = value_int;
|
|
} else if (!strcmp(key, "SamplingFrequency")) {
|
|
ast->codecpar->sample_rate = value_int;
|
|
} else if (!strcmp(key, "NominalBitrate")) {
|
|
} else if (!strcmp(key, "Length")) {
|
|
// size of file
|
|
} else {
|
|
value_used = 0;
|
|
}
|
|
}
|
|
|
|
if (!strcmp(key, "Version")) {
|
|
if (sscanf(value, "Vivo/%d.", &vivo->version) != 1)
|
|
return AVERROR_INVALIDDATA;
|
|
value_used = 1;
|
|
} else if (!strcmp(key, "FPS")) {
|
|
double d;
|
|
if (av_sscanf(value, "%f", &d) != 1)
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
value_used = 1;
|
|
if (!fps.num && !fps.den)
|
|
fps = av_inv_q(av_d2q(d, 10000));
|
|
}
|
|
|
|
if (!value_used)
|
|
av_dict_set(&s->metadata, key, value, 0);
|
|
}
|
|
}
|
|
if (!fps.num || !fps.den)
|
|
fps = (AVRational){ 1, 25 };
|
|
|
|
avpriv_set_pts_info(ast, 64, 1, ast->codecpar->sample_rate);
|
|
avpriv_set_pts_info(vst, 64, fps.num, fps.den);
|
|
if (duration)
|
|
s->duration = av_rescale(duration, 1000, 1);
|
|
|
|
vst->start_time = 0;
|
|
vst->codecpar->codec_tag = 0;
|
|
vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
|
|
|
|
if (vivo->version == 1) {
|
|
vst->codecpar->codec_id = AV_CODEC_ID_H263;
|
|
ast->codecpar->codec_id = AV_CODEC_ID_G723_1;
|
|
ast->codecpar->bits_per_coded_sample = 8;
|
|
ast->codecpar->block_align = 24;
|
|
ast->codecpar->bit_rate = 6400;
|
|
} else {
|
|
ast->codecpar->codec_id = AV_CODEC_ID_SIREN;
|
|
ast->codecpar->bits_per_coded_sample = 16;
|
|
ast->codecpar->block_align = 40;
|
|
ast->codecpar->bit_rate = 6400;
|
|
vivo->duration = 320;
|
|
}
|
|
|
|
ast->start_time = 0;
|
|
ast->codecpar->codec_tag = 0;
|
|
ast->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
|
|
ast->codecpar->channels = 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int vivo_read_packet(AVFormatContext *s, AVPacket *pkt)
|
|
{
|
|
VivoContext *vivo = s->priv_data;
|
|
AVIOContext *pb = s->pb;
|
|
unsigned old_sequence = vivo->sequence, old_type = vivo->type;
|
|
int stream_index, duration, ret = 0;
|
|
|
|
restart:
|
|
|
|
if (avio_feof(pb))
|
|
return AVERROR_EOF;
|
|
|
|
switch (vivo->type) {
|
|
case 0:
|
|
avio_skip(pb, vivo->length);
|
|
if ((ret = vivo_get_packet_header(s)) < 0)
|
|
return ret;
|
|
goto restart;
|
|
case 1:
|
|
case 2: // video
|
|
stream_index = 0;
|
|
duration = 1;
|
|
break;
|
|
case 3:
|
|
case 4: // audio
|
|
stream_index = 1;
|
|
duration = vivo->duration;
|
|
break;
|
|
default:
|
|
av_log(s, AV_LOG_ERROR, "unknown packet type %d\n", vivo->type);
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
if ((ret = av_get_packet(pb, pkt, vivo->length)) < 0)
|
|
return ret;
|
|
|
|
// get next packet header
|
|
if ((ret = vivo_get_packet_header(s)) < 0)
|
|
return ret;
|
|
|
|
while (vivo->sequence == old_sequence &&
|
|
(((vivo->type - 1) >> 1) == ((old_type - 1) >> 1))) {
|
|
if (avio_feof(pb)) {
|
|
return AVERROR_EOF;
|
|
}
|
|
|
|
if ((ret = av_append_packet(pb, pkt, vivo->length)) < 0)
|
|
return ret;
|
|
|
|
// get next packet header
|
|
if ((ret = vivo_get_packet_header(s)) < 0)
|
|
return ret;
|
|
}
|
|
|
|
pkt->stream_index = stream_index;
|
|
pkt->duration = duration;
|
|
|
|
return ret;
|
|
}
|
|
|
|
AVInputFormat ff_vivo_demuxer = {
|
|
.name = "vivo",
|
|
.long_name = NULL_IF_CONFIG_SMALL("Vivo"),
|
|
.priv_data_size = sizeof(VivoContext),
|
|
.read_probe = vivo_probe,
|
|
.read_header = vivo_read_header,
|
|
.read_packet = vivo_read_packet,
|
|
.extensions = "viv",
|
|
};
|