mirror of
https://git.ffmpeg.org/ffmpeg.git
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314 lines
8.5 KiB
C
314 lines
8.5 KiB
C
/*
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* Vivo stream demuxer
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* Copyright (c) 2009 Daniel Verkamp <daniel at drv.nu>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* @brief Vivo stream demuxer
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* @author Daniel Verkamp <daniel at drv.nu>
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* @sa http://wiki.multimedia.cx/index.php?title=Vivo
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*/
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#include "libavutil/parseutils.h"
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#include "avformat.h"
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#include "internal.h"
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typedef struct VivoContext {
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int version;
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int type;
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int sequence;
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int length;
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uint8_t text[1024 + 1];
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} VivoContext;
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static int vivo_probe(AVProbeData *p)
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{
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const unsigned char *buf = p->buf;
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unsigned c, length = 0;
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// stream must start with packet of type 0 and sequence number 0
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if (*buf++ != 0)
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return 0;
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// read at most 2 bytes of coded length
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c = *buf++;
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length = c & 0x7F;
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if (c & 0x80) {
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c = *buf++;
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length = (length << 7) | (c & 0x7F);
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}
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if (c & 0x80 || length > 1024 || length < 21)
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return 0;
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if (memcmp(buf, "\r\nVersion:Vivo/", 15))
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return 0;
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buf += 15;
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if (*buf < '0' && *buf > '2')
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return 0;
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return AVPROBE_SCORE_MAX;
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}
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static int vivo_get_packet_header(AVFormatContext *s)
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{
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VivoContext *vivo = s->priv_data;
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AVIOContext *pb = s->pb;
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unsigned c, get_length = 0;
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if (url_feof(pb))
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return AVERROR_EOF;
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c = avio_r8(pb);
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if (c == 0x82) {
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get_length = 1;
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c = avio_r8(pb);
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}
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vivo->type = c >> 4;
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vivo->sequence = c & 0xF;
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switch (vivo->type) {
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case 0: get_length = 1; break;
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case 1: vivo->length = 128; break;
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case 2: get_length = 1; break;
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case 3: vivo->length = 40; break;
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case 4: vivo->length = 24; break;
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default:
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av_log(s, AV_LOG_ERROR, "unknown packet type %d\n", vivo->type);
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return AVERROR_INVALIDDATA;
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}
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if (get_length) {
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c = avio_r8(pb);
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vivo->length = c & 0x7F;
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if (c & 0x80) {
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c = avio_r8(pb);
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vivo->length = (vivo->length << 7) | (c & 0x7F);
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if (c & 0x80) {
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av_log(s, AV_LOG_ERROR, "coded length is more than two bytes\n");
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return AVERROR_INVALIDDATA;
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}
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}
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}
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return 0;
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}
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static int vivo_read_header(AVFormatContext *s)
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{
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VivoContext *vivo = s->priv_data;
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AVRational fps = { 1, 25};
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AVStream *ast, *vst;
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unsigned char *line, *line_end, *key, *value;
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long value_int;
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int ret, value_used;
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int64_t duration = 0;
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char *end_value;
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vst = avformat_new_stream(s, NULL);
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ast = avformat_new_stream(s, NULL);
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if (!ast || !vst)
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return AVERROR(ENOMEM);
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ast->codec->sample_rate = 8000;
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while (1) {
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if ((ret = vivo_get_packet_header(s)) < 0)
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return ret;
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// done reading all text header packets?
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if (vivo->sequence || vivo->type)
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break;
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if (vivo->length <= 1024) {
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avio_read(s->pb, vivo->text, vivo->length);
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vivo->text[vivo->length] = 0;
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} else {
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av_log(s, AV_LOG_WARNING, "too big header, skipping\n");
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avio_skip(s->pb, vivo->length);
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continue;
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}
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line = vivo->text;
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while (*line) {
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line_end = strstr(line, "\r\n");
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if (!line_end)
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break;
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*line_end = 0;
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key = line;
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line = line_end + 2; // skip \r\n
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if (line_end == key) // skip blank lines
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continue;
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value = strchr(key, ':');
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if (!value) {
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av_log(s, AV_LOG_WARNING, "missing colon in key:value pair '%s'\n",
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value);
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continue;
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}
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*value++ = 0;
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av_log(s, AV_LOG_DEBUG, "header: '%s' = '%s'\n", key, value);
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value_int = strtol(value, &end_value, 10);
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value_used = 0;
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if (*end_value == 0) { // valid integer
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av_log(s, AV_LOG_DEBUG, "got a valid integer (%ld)\n", value_int);
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value_used = 1;
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if (!strcmp(key, "Duration")) {
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duration = value_int;
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} else if (!strcmp(key, "Width")) {
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vst->codec->width = value_int;
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} else if (!strcmp(key, "Height")) {
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vst->codec->height = value_int;
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} else if (!strcmp(key, "TimeUnitNumerator")) {
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fps.num = value_int / 1000;
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} else if (!strcmp(key, "TimeUnitDenominator")) {
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fps.den = value_int;
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} else if (!strcmp(key, "SamplingFrequency")) {
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ast->codec->sample_rate = value_int;
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} else if (!strcmp(key, "NominalBitrate")) {
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} else if (!strcmp(key, "Length")) {
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// size of file
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} else {
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value_used = 0;
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}
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}
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if (!strcmp(key, "Version")) {
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if (sscanf(value, "Vivo/%d.", &vivo->version) != 1)
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return AVERROR_INVALIDDATA;
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value_used = 1;
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} else if (!strcmp(key, "FPS")) {
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AVRational tmp;
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value_used = 1;
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if (!av_parse_ratio(&tmp, value, 10000, AV_LOG_WARNING, s))
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fps = av_inv_q(tmp);
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}
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if (!value_used)
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av_dict_set(&s->metadata, key, value, 0);
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}
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}
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avpriv_set_pts_info(ast, 64, 1, ast->codec->sample_rate);
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avpriv_set_pts_info(vst, 64, fps.num, fps.den);
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if (duration)
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s->duration = av_rescale(duration, 1000, 1);
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vst->start_time = 0;
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vst->codec->codec_tag = 0;
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vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;
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if (vivo->version == 1) {
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vst->codec->codec_id = AV_CODEC_ID_H263;
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ast->codec->codec_id = AV_CODEC_ID_G723_1;
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ast->codec->bits_per_coded_sample = 8;
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ast->codec->block_align = 24;
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ast->codec->bit_rate = 6400;
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}
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ast->start_time = 0;
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ast->codec->codec_tag = 0;
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ast->codec->codec_type = AVMEDIA_TYPE_AUDIO;
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ast->codec->channels = 1;
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return 0;
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}
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static int vivo_read_packet(AVFormatContext *s, AVPacket *pkt)
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{
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VivoContext *vivo = s->priv_data;
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AVIOContext *pb = s->pb;
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unsigned old_sequence = vivo->sequence, old_type = vivo->type;
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int stream_index, ret = 0;
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restart:
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if (url_feof(pb))
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return AVERROR_EOF;
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switch (vivo->type) {
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case 0:
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avio_skip(pb, vivo->length);
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if ((ret = vivo_get_packet_header(s)) < 0)
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return ret;
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goto restart;
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case 1:
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case 2: // video
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stream_index = 0;
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break;
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case 3:
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case 4: // audio
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stream_index = 1;
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break;
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default:
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av_log(s, AV_LOG_ERROR, "unknown packet type %d\n", vivo->type);
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return AVERROR_INVALIDDATA;
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}
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if ((ret = av_get_packet(pb, pkt, vivo->length)) < 0)
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goto fail;
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// get next packet header
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if ((ret = vivo_get_packet_header(s)) < 0)
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goto fail;
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while (vivo->sequence == old_sequence &&
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(((vivo->type - 1) >> 1) == ((old_type - 1) >> 1))) {
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if (url_feof(pb)) {
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ret = AVERROR_EOF;
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break;
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}
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if ((ret = av_append_packet(pb, pkt, vivo->length)) < 0)
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break;
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// get next packet header
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if ((ret = vivo_get_packet_header(s)) < 0)
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break;
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}
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pkt->stream_index = stream_index;
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fail:
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if (ret < 0)
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av_free_packet(pkt);
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return ret;
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}
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AVInputFormat ff_vivo_demuxer = {
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.name = "vivo",
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.long_name = NULL_IF_CONFIG_SMALL("Vivo"),
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.priv_data_size = sizeof(VivoContext),
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.read_probe = vivo_probe,
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.read_header = vivo_read_header,
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.read_packet = vivo_read_packet,
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.extensions = "viv",
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};
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