diff options
Diffstat (limited to 'libavformat/vivo.c')
| -rw-r--r-- | libavformat/vivo.c | 313 |
1 files changed, 313 insertions, 0 deletions
diff --git a/libavformat/vivo.c b/libavformat/vivo.c new file mode 100644 index 0000000000..7287379801 --- /dev/null +++ b/libavformat/vivo.c @@ -0,0 +1,313 @@ +/* + * 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", +}; |