| /* |
| * IFV demuxer |
| * |
| * Copyright (c) 2019 Swaraj Hota |
| * |
| * 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 |
| */ |
| |
| #include "avformat.h" |
| #include "internal.h" |
| #include "avio_internal.h" |
| |
| typedef struct IFVContext { |
| uint32_t next_video_index; |
| uint32_t next_audio_index; |
| uint32_t total_vframes; |
| uint32_t total_aframes; |
| |
| int width, height; |
| int is_audio_present; |
| int sample_rate; |
| |
| int video_stream_index; |
| int audio_stream_index; |
| } IFVContext; |
| |
| static int ifv_probe(const AVProbeData *p) |
| { |
| static const uint8_t ifv_magic[] = {0x11, 0xd2, 0xd3, 0xab, 0xba, 0xa9, |
| 0xcf, 0x11, 0x8e, 0xe6, 0x00, 0xc0, 0x0c, 0x20, 0x53, 0x65, 0x44}; |
| |
| if (!memcmp(p->buf, ifv_magic, sizeof(ifv_magic))) |
| return AVPROBE_SCORE_MAX; |
| |
| return 0; |
| } |
| |
| static int read_index(AVFormatContext *s, |
| enum AVMediaType frame_type, |
| uint32_t start_index) |
| { |
| IFVContext *ifv = s->priv_data; |
| AVStream *st; |
| int64_t pos, size, timestamp; |
| uint32_t end_index, i; |
| int ret; |
| |
| if (frame_type == AVMEDIA_TYPE_VIDEO) { |
| end_index = ifv->total_vframes; |
| st = s->streams[ifv->video_stream_index]; |
| } else { |
| end_index = ifv->total_aframes; |
| st = s->streams[ifv->audio_stream_index]; |
| } |
| |
| for (i = start_index; i < end_index; i++) { |
| if (avio_feof(s->pb)) |
| return AVERROR_EOF; |
| pos = avio_rl32(s->pb); |
| size = avio_rl32(s->pb); |
| |
| avio_skip(s->pb, 8); |
| timestamp = avio_rl32(s->pb); |
| |
| ret = av_add_index_entry(st, pos, timestamp, size, 0, 0); |
| if (ret < 0) |
| return ret; |
| |
| avio_skip(s->pb, frame_type == AVMEDIA_TYPE_VIDEO ? 8: 4); |
| } |
| |
| return 0; |
| } |
| |
| static int parse_header(AVFormatContext *s) |
| { |
| IFVContext *ifv = s->priv_data; |
| uint32_t aud_magic; |
| uint32_t vid_magic; |
| |
| avio_skip(s->pb, 0x34); |
| avpriv_dict_set_timestamp(&s->metadata, "creation_time", avio_rl32(s->pb) * 1000000LL); |
| avio_skip(s->pb, 0x24); |
| |
| ifv->width = avio_rl16(s->pb); |
| ifv->height = avio_rl16(s->pb); |
| |
| avio_skip(s->pb, 0x8); |
| vid_magic = avio_rl32(s->pb); |
| |
| if (vid_magic != MKTAG('H','2','6','4')) |
| avpriv_request_sample(s, "Unknown video codec %x", vid_magic); |
| |
| avio_skip(s->pb, 0x2c); |
| ifv->sample_rate = avio_rl32(s->pb); |
| aud_magic = avio_rl32(s->pb); |
| |
| if (aud_magic == MKTAG('G','R','A','W')) { |
| ifv->is_audio_present = 1; |
| } else if (aud_magic == MKTAG('P','C','M','U')) { |
| ifv->is_audio_present = 0; |
| } else { |
| avpriv_request_sample(s, "Unknown audio codec %x", aud_magic); |
| } |
| |
| avio_skip(s->pb, 0x44); |
| ifv->total_vframes = avio_rl32(s->pb); |
| ifv->total_aframes = avio_rl32(s->pb); |
| |
| return 0; |
| } |
| |
| static int ifv_read_header(AVFormatContext *s) |
| { |
| IFVContext *ifv = s->priv_data; |
| AVStream *st; |
| int ret; |
| |
| ret = parse_header(s); |
| if (ret < 0) |
| return ret; |
| |
| st = avformat_new_stream(s, NULL); |
| if (!st) |
| return AVERROR(ENOMEM); |
| |
| st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO; |
| st->codecpar->codec_id = AV_CODEC_ID_H264; |
| st->codecpar->width = ifv->width; |
| st->codecpar->height = ifv->height; |
| st->start_time = 0; |
| ifv->video_stream_index = st->index; |
| |
| avpriv_set_pts_info(st, 32, 1, 1000); |
| |
| if (ifv->is_audio_present) { |
| st = avformat_new_stream(s, NULL); |
| if (!st) |
| return AVERROR(ENOMEM); |
| |
| st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; |
| st->codecpar->codec_id = AV_CODEC_ID_PCM_S16LE; |
| st->codecpar->channels = 1; |
| st->codecpar->channel_layout = AV_CH_LAYOUT_MONO; |
| st->codecpar->sample_rate = ifv->sample_rate; |
| ifv->audio_stream_index = st->index; |
| |
| avpriv_set_pts_info(st, 32, 1, 1000); |
| } |
| |
| /*read video index*/ |
| avio_seek(s->pb, 0xf8, SEEK_SET); |
| |
| ret = read_index(s, AVMEDIA_TYPE_VIDEO, 0); |
| if (ret < 0) |
| return ret; |
| |
| if (ifv->is_audio_present) { |
| /*read audio index*/ |
| avio_seek(s->pb, 0x14918, SEEK_SET); |
| |
| ret = read_index(s, AVMEDIA_TYPE_AUDIO, 0); |
| if (ret < 0) |
| return ret; |
| } |
| |
| ifv->next_video_index = 0; |
| ifv->next_audio_index = 0; |
| |
| return 0; |
| } |
| |
| static int ifv_read_packet(AVFormatContext *s, AVPacket *pkt) |
| { |
| IFVContext *ifv = s->priv_data; |
| AVStream *st; |
| AVIndexEntry *ev, *ea, *e_next; |
| int ret; |
| |
| ev = ea = e_next = NULL; |
| |
| if (ifv->next_video_index < ifv->total_vframes) { |
| st = s->streams[ifv->video_stream_index]; |
| if (ifv->next_video_index < st->internal->nb_index_entries) |
| e_next = ev = &st->internal->index_entries[ifv->next_video_index]; |
| } |
| |
| if (ifv->is_audio_present && |
| ifv->next_audio_index < ifv->total_aframes) { |
| st = s->streams[ifv->audio_stream_index]; |
| if (ifv->next_audio_index < st->internal->nb_index_entries) { |
| ea = &st->internal->index_entries[ifv->next_audio_index]; |
| if (!ev || ea->timestamp < ev->timestamp) |
| e_next = ea; |
| } |
| } |
| |
| if (!ev) { |
| uint64_t vframes, aframes; |
| if (ifv->is_audio_present && !ea) { |
| /*read new video and audio indexes*/ |
| |
| ifv->next_video_index = ifv->total_vframes; |
| ifv->next_audio_index = ifv->total_aframes; |
| |
| avio_skip(s->pb, 0x1c); |
| vframes = ifv->total_vframes + (uint64_t)avio_rl32(s->pb); |
| aframes = ifv->total_aframes + (uint64_t)avio_rl32(s->pb); |
| if (vframes > INT_MAX || aframes > INT_MAX) |
| return AVERROR_INVALIDDATA; |
| ifv->total_vframes = vframes; |
| ifv->total_aframes = aframes; |
| avio_skip(s->pb, 0xc); |
| |
| if (avio_feof(s->pb)) |
| return AVERROR_EOF; |
| |
| ret = read_index(s, AVMEDIA_TYPE_VIDEO, ifv->next_video_index); |
| if (ret < 0) |
| return ret; |
| |
| ret = read_index(s, AVMEDIA_TYPE_AUDIO, ifv->next_audio_index); |
| if (ret < 0) |
| return ret; |
| |
| return 0; |
| |
| } else if (!ifv->is_audio_present) { |
| /*read new video index*/ |
| |
| ifv->next_video_index = ifv->total_vframes; |
| |
| avio_skip(s->pb, 0x1c); |
| vframes = ifv->total_vframes + (uint64_t)avio_rl32(s->pb); |
| if (vframes > INT_MAX) |
| return AVERROR_INVALIDDATA; |
| ifv->total_vframes = vframes; |
| avio_skip(s->pb, 0x10); |
| |
| if (avio_feof(s->pb)) |
| return AVERROR_EOF; |
| |
| ret = read_index(s, AVMEDIA_TYPE_VIDEO, ifv->next_video_index); |
| if (ret < 0) |
| return ret; |
| |
| return 0; |
| } |
| } |
| |
| if (!e_next) return AVERROR_EOF; |
| |
| avio_seek(s->pb, e_next->pos, SEEK_SET); |
| ret = av_get_packet(s->pb, pkt, e_next->size); |
| if (ret < 0) |
| return ret; |
| |
| if (e_next == ev) { |
| ifv->next_video_index++; |
| pkt->stream_index = ifv->video_stream_index; |
| } else { |
| ifv->next_audio_index++; |
| pkt->stream_index = ifv->audio_stream_index; |
| } |
| |
| pkt->pts = e_next->timestamp; |
| pkt->pos = e_next->pos; |
| |
| return 0; |
| } |
| |
| static int ifv_read_seek(AVFormatContext *s, int stream_index, int64_t ts, int flags) |
| { |
| IFVContext *ifv = s->priv_data; |
| |
| for (unsigned i = 0; i < s->nb_streams; i++) { |
| int index = av_index_search_timestamp(s->streams[i], ts, AVSEEK_FLAG_ANY); |
| if (index < 0) { |
| ifv->next_video_index = ifv->total_vframes - 1; |
| ifv->next_audio_index = ifv->total_aframes - 1; |
| return 0; |
| } |
| |
| if (i == ifv->video_stream_index) { |
| ifv->next_video_index = index; |
| } else { |
| ifv->next_audio_index = index; |
| } |
| } |
| |
| return 0; |
| } |
| |
| AVInputFormat ff_ifv_demuxer = { |
| .name = "ifv", |
| .long_name = NULL_IF_CONFIG_SMALL("IFV CCTV DVR"), |
| .priv_data_size = sizeof(IFVContext), |
| .extensions = "ifv", |
| .read_probe = ifv_probe, |
| .read_header = ifv_read_header, |
| .read_packet = ifv_read_packet, |
| .read_seek = ifv_read_seek, |
| }; |