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author | Swaraj Hota <swarajhota353@gmail.com> | 2019-06-10 09:25:27 +0530 |
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committer | Peter Ross <pross@xvid.org> | 2019-06-21 22:02:14 +1000 |
commit | d70fece5609fa62db62c894d63bffc99aa677142 (patch) | |
tree | e56c7621f07791092398021ad57995bdd8d5bbb8 /libavformat/ifv.c | |
parent | 18dab6175bad2864c8d19a1d1476f5a3c1130599 (diff) | |
download | ffmpeg-d70fece5609fa62db62c894d63bffc99aa677142.tar.gz |
avformat/ifv: added support for ifv cctv files
Fixes ticket #2956.
Signed-off-by: Swaraj Hota <swarajhota353@gmail.com>
Signed-off-by: Peter Ross <pross@xvid.org>
Diffstat (limited to 'libavformat/ifv.c')
-rw-r--r-- | libavformat/ifv.c | 304 |
1 files changed, 304 insertions, 0 deletions
diff --git a/libavformat/ifv.c b/libavformat/ifv.c new file mode 100644 index 0000000000..03c682bb9d --- /dev/null +++ b/libavformat/ifv.c @@ -0,0 +1,304 @@ +/* + * 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++) { + 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, 0x5c); + 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->nb_index_entries) + e_next = ev = &st->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->nb_index_entries) { + ea = &st->index_entries[ifv->next_audio_index]; + if (!ev || ea->timestamp < ev->timestamp) + e_next = ea; + } + } + + if (!ev) { + 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); + ifv->total_vframes += avio_rl32(s->pb); + ifv->total_aframes += avio_rl32(s->pb); + 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); + ifv->total_vframes += avio_rl32(s->pb); + 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, +}; |