/* * 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/parseutils.h" #include "avformat.h" #include "internal.h" typedef struct VivoContext { int version; int type; int sequence; int length; uint8_t text[1024 + 1]; } VivoContext; static int vivo_probe(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; if (memcmp(buf, "\r\nVersion:Vivo/", 15)) return 0; buf += 15; 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 = { 1, 25}; 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->codec->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", value); 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->codec->width = value_int; } else if (!strcmp(key, "Height")) { vst->codec->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->codec->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")) { AVRational tmp; value_used = 1; if (!av_parse_ratio(&tmp, value, 10000, AV_LOG_WARNING, s)) fps = av_inv_q(tmp); } if (!value_used) av_dict_set(&s->metadata, key, value, 0); } } avpriv_set_pts_info(ast, 64, 1, ast->codec->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->codec->codec_tag = 0; vst->codec->codec_type = AVMEDIA_TYPE_VIDEO; if (vivo->version == 1) { vst->codec->codec_id = AV_CODEC_ID_H263; ast->codec->codec_id = AV_CODEC_ID_G723_1; ast->codec->bits_per_coded_sample = 8; ast->codec->block_align = 24; ast->codec->bit_rate = 6400; } ast->start_time = 0; ast->codec->codec_tag = 0; ast->codec->codec_type = AVMEDIA_TYPE_AUDIO; ast->codec->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, 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; break; case 3: case 4: // audio stream_index = 1; 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) goto fail; // get next packet header if ((ret = vivo_get_packet_header(s)) < 0) goto fail; while (vivo->sequence == old_sequence && (((vivo->type - 1) >> 1) == ((old_type - 1) >> 1))) { if (avio_feof(pb)) { ret = AVERROR_EOF; break; } if ((ret = av_append_packet(pb, pkt, vivo->length)) < 0) break; // get next packet header if ((ret = vivo_get_packet_header(s)) < 0) break; } pkt->stream_index = stream_index; fail: if (ret < 0) av_free_packet(pkt); 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", };