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ffmpeg/libavformat/vivo.c

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/*
* 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 "demux.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->ch_layout.nb_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;
}
const FFInputFormat ff_vivo_demuxer = {
.p.name = "vivo",
.p.long_name = NULL_IF_CONFIG_SMALL("Vivo"),
.p.extensions = "viv",
.priv_data_size = sizeof(VivoContext),
.read_probe = vivo_probe,
.read_header = vivo_read_header,
.read_packet = vivo_read_packet,
};
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