| /* | |
| * 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, | |
| }; |