mirror of https://github.com/FFmpeg/FFmpeg.git
Fixes ticket #2956. Signed-off-by: Swaraj Hota <swarajhota353@gmail.com> Signed-off-by: Peter Ross <pross@xvid.org>pull/315/head
Swaraj Hota
6 years ago
committed by
Peter Ross
parent
18dab6175b
commit
d70fece560
6 changed files with 311 additions and 2 deletions
@ -0,0 +1,304 @@ |
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/*
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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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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, 0x5c); |
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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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