309 lines
8.2 KiB
C
Executable file
309 lines
8.2 KiB
C
Executable file
/*
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* IFV demuxer
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*
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* Copyright (c) 2019 Swaraj Hota
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "avformat.h"
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#include "internal.h"
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#include "avio_internal.h"
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typedef struct IFVContext {
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uint32_t next_video_index;
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uint32_t next_audio_index;
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uint32_t total_vframes;
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uint32_t total_aframes;
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int width, height;
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int is_audio_present;
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int sample_rate;
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int video_stream_index;
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int audio_stream_index;
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} IFVContext;
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static int ifv_probe(const AVProbeData *p)
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{
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static const uint8_t ifv_magic[] = {0x11, 0xd2, 0xd3, 0xab, 0xba, 0xa9,
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0xcf, 0x11, 0x8e, 0xe6, 0x00, 0xc0, 0x0c, 0x20, 0x53, 0x65, 0x44};
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if (!memcmp(p->buf, ifv_magic, sizeof(ifv_magic)))
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return AVPROBE_SCORE_MAX;
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return 0;
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}
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static int read_index(AVFormatContext *s,
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enum AVMediaType frame_type,
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uint32_t start_index)
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{
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IFVContext *ifv = s->priv_data;
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AVStream *st;
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int64_t pos, size, timestamp;
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uint32_t end_index, i;
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int ret;
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if (frame_type == AVMEDIA_TYPE_VIDEO) {
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end_index = ifv->total_vframes;
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st = s->streams[ifv->video_stream_index];
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} else {
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end_index = ifv->total_aframes;
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st = s->streams[ifv->audio_stream_index];
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}
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for (i = start_index; i < end_index; i++) {
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if (avio_feof(s->pb))
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return AVERROR_EOF;
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pos = avio_rl32(s->pb);
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size = avio_rl32(s->pb);
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avio_skip(s->pb, 8);
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timestamp = avio_rl32(s->pb);
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ret = av_add_index_entry(st, pos, timestamp, size, 0, 0);
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if (ret < 0)
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return ret;
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avio_skip(s->pb, frame_type == AVMEDIA_TYPE_VIDEO ? 8: 4);
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}
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return 0;
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}
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static int parse_header(AVFormatContext *s)
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{
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IFVContext *ifv = s->priv_data;
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uint32_t aud_magic;
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uint32_t vid_magic;
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avio_skip(s->pb, 0x34);
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avpriv_dict_set_timestamp(&s->metadata, "creation_time", avio_rl32(s->pb) * 1000000LL);
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avio_skip(s->pb, 0x24);
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ifv->width = avio_rl16(s->pb);
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ifv->height = avio_rl16(s->pb);
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avio_skip(s->pb, 0x8);
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vid_magic = avio_rl32(s->pb);
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if (vid_magic != MKTAG('H','2','6','4'))
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avpriv_request_sample(s, "Unknown video codec %x", vid_magic);
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avio_skip(s->pb, 0x2c);
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ifv->sample_rate = avio_rl32(s->pb);
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aud_magic = avio_rl32(s->pb);
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if (aud_magic == MKTAG('G','R','A','W')) {
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ifv->is_audio_present = 1;
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} else if (aud_magic == MKTAG('P','C','M','U')) {
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ifv->is_audio_present = 0;
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} else {
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avpriv_request_sample(s, "Unknown audio codec %x", aud_magic);
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}
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avio_skip(s->pb, 0x44);
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ifv->total_vframes = avio_rl32(s->pb);
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ifv->total_aframes = avio_rl32(s->pb);
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return 0;
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}
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static int ifv_read_header(AVFormatContext *s)
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{
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IFVContext *ifv = s->priv_data;
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AVStream *st;
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int ret;
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ret = parse_header(s);
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if (ret < 0)
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return ret;
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st = avformat_new_stream(s, NULL);
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if (!st)
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return AVERROR(ENOMEM);
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st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
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st->codecpar->codec_id = AV_CODEC_ID_H264;
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st->codecpar->width = ifv->width;
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st->codecpar->height = ifv->height;
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st->start_time = 0;
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ifv->video_stream_index = st->index;
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avpriv_set_pts_info(st, 32, 1, 1000);
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if (ifv->is_audio_present) {
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st = avformat_new_stream(s, NULL);
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if (!st)
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return AVERROR(ENOMEM);
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st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
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st->codecpar->codec_id = AV_CODEC_ID_PCM_S16LE;
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st->codecpar->channels = 1;
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st->codecpar->channel_layout = AV_CH_LAYOUT_MONO;
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st->codecpar->sample_rate = ifv->sample_rate;
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ifv->audio_stream_index = st->index;
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avpriv_set_pts_info(st, 32, 1, 1000);
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}
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/*read video index*/
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avio_seek(s->pb, 0xf8, SEEK_SET);
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ret = read_index(s, AVMEDIA_TYPE_VIDEO, 0);
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if (ret < 0)
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return ret;
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if (ifv->is_audio_present) {
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/*read audio index*/
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avio_seek(s->pb, 0x14918, SEEK_SET);
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ret = read_index(s, AVMEDIA_TYPE_AUDIO, 0);
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if (ret < 0)
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return ret;
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}
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ifv->next_video_index = 0;
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ifv->next_audio_index = 0;
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return 0;
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}
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static int ifv_read_packet(AVFormatContext *s, AVPacket *pkt)
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{
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IFVContext *ifv = s->priv_data;
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AVStream *st;
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AVIndexEntry *ev, *ea, *e_next;
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int ret;
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ev = ea = e_next = NULL;
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if (ifv->next_video_index < ifv->total_vframes) {
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st = s->streams[ifv->video_stream_index];
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if (ifv->next_video_index < st->nb_index_entries)
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e_next = ev = &st->index_entries[ifv->next_video_index];
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}
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if (ifv->is_audio_present &&
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ifv->next_audio_index < ifv->total_aframes) {
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st = s->streams[ifv->audio_stream_index];
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if (ifv->next_audio_index < st->nb_index_entries) {
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ea = &st->index_entries[ifv->next_audio_index];
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if (!ev || ea->timestamp < ev->timestamp)
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e_next = ea;
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}
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}
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if (!ev) {
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if (ifv->is_audio_present && !ea) {
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/*read new video and audio indexes*/
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ifv->next_video_index = ifv->total_vframes;
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ifv->next_audio_index = ifv->total_aframes;
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avio_skip(s->pb, 0x1c);
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ifv->total_vframes += avio_rl32(s->pb);
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ifv->total_aframes += avio_rl32(s->pb);
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avio_skip(s->pb, 0xc);
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if (avio_feof(s->pb))
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return AVERROR_EOF;
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ret = read_index(s, AVMEDIA_TYPE_VIDEO, ifv->next_video_index);
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if (ret < 0)
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return ret;
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ret = read_index(s, AVMEDIA_TYPE_AUDIO, ifv->next_audio_index);
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if (ret < 0)
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return ret;
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return 0;
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} else if (!ifv->is_audio_present) {
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/*read new video index*/
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ifv->next_video_index = ifv->total_vframes;
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avio_skip(s->pb, 0x1c);
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ifv->total_vframes += avio_rl32(s->pb);
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avio_skip(s->pb, 0x10);
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if (avio_feof(s->pb))
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return AVERROR_EOF;
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ret = read_index(s, AVMEDIA_TYPE_VIDEO, ifv->next_video_index);
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if (ret < 0)
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return ret;
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return 0;
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}
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}
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if (!e_next) return AVERROR_EOF;
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avio_seek(s->pb, e_next->pos, SEEK_SET);
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ret = av_get_packet(s->pb, pkt, e_next->size);
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if (ret < 0)
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return ret;
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if (e_next == ev) {
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ifv->next_video_index++;
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pkt->stream_index = ifv->video_stream_index;
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} else {
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ifv->next_audio_index++;
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pkt->stream_index = ifv->audio_stream_index;
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}
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pkt->pts = e_next->timestamp;
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pkt->pos = e_next->pos;
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return 0;
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}
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static int ifv_read_seek(AVFormatContext *s, int stream_index, int64_t ts, int flags)
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{
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IFVContext *ifv = s->priv_data;
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for (unsigned i = 0; i < s->nb_streams; i++) {
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int index = av_index_search_timestamp(s->streams[i], ts, AVSEEK_FLAG_ANY);
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if (index < 0) {
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ifv->next_video_index = ifv->total_vframes - 1;
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ifv->next_audio_index = ifv->total_aframes - 1;
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return 0;
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}
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if (i == ifv->video_stream_index) {
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ifv->next_video_index = index;
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} else {
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ifv->next_audio_index = index;
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}
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}
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return 0;
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}
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AVInputFormat ff_ifv_demuxer = {
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.name = "ifv",
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.long_name = NULL_IF_CONFIG_SMALL("IFV CCTV DVR"),
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.priv_data_size = sizeof(IFVContext),
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.extensions = "ifv",
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.read_probe = ifv_probe,
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.read_header = ifv_read_header,
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.read_packet = ifv_read_packet,
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.read_seek = ifv_read_seek,
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};
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