[FFmpeg-devel] [PATCH] avformat/ifv: added support for ifv cctv files
Swaraj Hota
swarajhota353 at gmail.com
Fri Apr 26 20:58:17 EEST 2019
On Sat, Apr 20, 2019 at 05:44:40AM +0530, Swaraj Hota wrote:
> Fixes ticket #2956.
>
> Signed-off-by: Swaraj Hota <swarajhota353 at gmail.com>
> ---
> I have tested it on all the samples provided in the ticket and
> it works for all of them.
>
> Please comment.
> ---
> Changelog | 1 +
> libavformat/Makefile | 1 +
> libavformat/allformats.c | 1 +
> libavformat/ifv.c | 332 +++++++++++++++++++++++++++++++++++++++
> libavformat/version.h | 4 +-
> 5 files changed, 337 insertions(+), 2 deletions(-)
> create mode 100644 libavformat/ifv.c
>
> diff --git a/Changelog b/Changelog
> index 5b2b1e5af4..2a48c6b284 100644
> --- a/Changelog
> +++ b/Changelog
> @@ -24,6 +24,7 @@ version <next>:
> - KUX demuxer
> - AV1 frame split bitstream filter
> - lscr decoder
> +- IFV demuxer
>
>
> version 4.1:
> diff --git a/libavformat/Makefile b/libavformat/Makefile
> index 99be60d184..f68d41e4a5 100644
> --- a/libavformat/Makefile
> +++ b/libavformat/Makefile
> @@ -231,6 +231,7 @@ OBJS-$(CONFIG_ICO_MUXER) += icoenc.o
> OBJS-$(CONFIG_IDCIN_DEMUXER) += idcin.o
> OBJS-$(CONFIG_IDF_DEMUXER) += bintext.o sauce.o
> OBJS-$(CONFIG_IFF_DEMUXER) += iff.o
> +OBJS-$(CONFIG_IFV_DEMUXER) += ifv.o
> OBJS-$(CONFIG_ILBC_DEMUXER) += ilbc.o
> OBJS-$(CONFIG_ILBC_MUXER) += ilbc.o
> OBJS-$(CONFIG_IMAGE2_DEMUXER) += img2dec.o img2.o
> diff --git a/libavformat/allformats.c b/libavformat/allformats.c
> index d316a0529a..cd00834807 100644
> --- a/libavformat/allformats.c
> +++ b/libavformat/allformats.c
> @@ -188,6 +188,7 @@ extern AVOutputFormat ff_ico_muxer;
> extern AVInputFormat ff_idcin_demuxer;
> extern AVInputFormat ff_idf_demuxer;
> extern AVInputFormat ff_iff_demuxer;
> +extern AVInputFormat ff_ifv_demuxer;
> extern AVInputFormat ff_ilbc_demuxer;
> extern AVOutputFormat ff_ilbc_muxer;
> extern AVInputFormat ff_image2_demuxer;
> diff --git a/libavformat/ifv.c b/libavformat/ifv.c
> new file mode 100644
> index 0000000000..dc871c5b44
> --- /dev/null
> +++ b/libavformat/ifv.c
> @@ -0,0 +1,332 @@
> +/*
> + * IFV demuxer
> + *
> + * Copyright (c) 2018 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"
> +
> +#define IFV_MAGIC "\x11\xd2\xd3\xab\xba\xa9\xcf\x11\
> +\x8e\xe6\x00\xc0\x0c\x20\x53\x65\x44"
> +
> +typedef struct IFVIndexEntry {
> + uint32_t frame_offset;
> + uint32_t frame_size;
> + enum AVMediaType frame_type;
> +} IFVIndexEntry;
> +
> +typedef struct IFVContext {
> + IFVIndexEntry *vid_index;
> + IFVIndexEntry *aud_index;
> + uint32_t index_pos;
> + uint32_t total_vframes;
> + uint32_t total_aframes;
> +
> + int frame_rate;
> + int is_audio_present;
> + int sample_rate;
> +
> + int video_stream_index;
> + int audio_stream_index;
> +} IFVContext;
> +
> +static int ifv_probe(const AVProbeData *p)
> +{
> + if (!memcmp(p->buf, IFV_MAGIC, 17))
> + return AVPROBE_SCORE_MAX;
> + return 0;
> +}
> +
> +static int read_next_index_entry(AVFormatContext *s, enum AVMediaType frame_type)
> +{
> + IFVContext *ifv = s->priv_data;
> + IFVIndexEntry *e;
> +
> + if (frame_type == AVMEDIA_TYPE_VIDEO) {
> + if (ifv->index_pos >= ifv->total_vframes)
> + return 0;
> +
> + e = &ifv->vid_index[ifv->index_pos++];
> +
> + e->frame_offset = avio_rl32(s->pb);
> + e->frame_size = avio_rl32(s->pb);
> + e->frame_type = frame_type;
> +
> + avio_skip(s->pb, 20);
> +
> + } else if (frame_type == AVMEDIA_TYPE_AUDIO) {
> + if (ifv->index_pos >= ifv->total_aframes)
> + return 0;
> +
> + e = &ifv->aud_index[ifv->index_pos++];
> +
> + e->frame_offset = avio_rl32(s->pb);
> + e->frame_size = avio_rl32(s->pb);
> + e->frame_type = frame_type;
> +
> + avio_skip(s->pb, 16);
> + }
> +
> + return 1;
> +}
> +
> +static int read_index(AVFormatContext *s, enum AVMediaType frame_type)
> +{
> + IFVContext *ifv = s->priv_data;
> + int ret;
> +
> + if (frame_type == AVMEDIA_TYPE_VIDEO) {
> + ret = av_reallocp_array(&ifv->vid_index, ifv->total_vframes, sizeof(IFVIndexEntry));
> + if (ret < 0)
> + return ret;
> +
> + } else if (frame_type == AVMEDIA_TYPE_AUDIO) {
> + ret = av_reallocp_array(&ifv->aud_index, ifv->total_aframes, sizeof(IFVIndexEntry));
> + if (ret < 0)
> + return ret;
> + }
> +
> + while (read_next_index_entry(s, frame_type))
> + ;
> +
> + 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, 0x68);
> + vid_magic = avio_rl32(s->pb);
> +
> + if (vid_magic != MKTAG('H','2','6','4'))
> + avpriv_request_sample(s, "Unknown video codec %x\n", vid_magic);
> +
> + avio_skip(s->pb, 0x8);
> + ifv->frame_rate = avio_rl32(s->pb);
> +
> + avio_skip(s->pb, 0x20);
> + 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\n", 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;
> +
> + ifv->vid_index = NULL;
> + ifv->aud_index = NULL;
> +
> + /*read video index*/
> + avio_seek(s->pb, 0xf8, SEEK_SET);
> +
> + ifv->index_pos = 0;
> + ret = read_index(s, AVMEDIA_TYPE_VIDEO);
> + if (ret < 0)
> + return ret;
> +
> + if (ifv->is_audio_present) {
> + /*read audio index*/
> + avio_seek(s->pb, 0x14918, SEEK_SET);
> +
> + ifv->index_pos = 0;
> + ret = read_index(s, AVMEDIA_TYPE_AUDIO);
> + 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;
> + ifv->video_stream_index = st->index;
> +
> + avpriv_set_pts_info(st, 32, 1, ifv->frame_rate);
> +
> + 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;
> + }
> +
> + avio_skip(s->pb, ifv->vid_index->frame_offset - avio_tell(s->pb));
> +
> + return 0;
> +}
> +
> +static int ifv_read_packet(AVFormatContext *s, AVPacket *pkt)
> +{
> + IFVContext *ifv = s->priv_data;
> + IFVIndexEntry *e;
> + uint32_t pos, nb_new_vframes, nb_new_aframes, new_index_start;
> + int ret, i, j, vdiff, adiff;
> +
> + vdiff = adiff = INT_MAX;
> +
> + pos = avio_tell(s->pb);
> +
> + for (i = 0; i < ifv->total_vframes; i++) {
> + e = &ifv->vid_index[i];
> + if (e->frame_offset >= pos)
> + break;
> + }
> +
> + vdiff = e->frame_offset - pos;
> +
> + if (ifv->is_audio_present && vdiff) {
> + for (j = 0; j < ifv->total_aframes; j++) {
> + e = &ifv->aud_index[j];
> + if (e->frame_offset >= pos)
> + break;
> + }
> +
> + adiff = e->frame_offset - pos;
> + }
> +
> + if (vdiff >= 0 && adiff >= 0) {
> + /*skip to the boundary of next frame if needed*/
> + avio_skip(s->pb, FFMIN(vdiff, adiff));
> + if (vdiff && adiff)
> + return 0;
> + }
> +
> + if (i == ifv->total_vframes) {
> + if (ifv->is_audio_present && j == ifv->total_aframes) {
> + /*read new video and audio indexes*/
> +
> + avio_skip(s->pb, 0x1c);
> + nb_new_vframes = avio_rl32(s->pb);
> + nb_new_aframes = avio_rl32(s->pb);
> + avio_skip(s->pb, 0xc);
> +
> + if (avio_feof(s->pb))
> + return AVERROR_EOF;
> +
> + ifv->index_pos = new_index_start = ifv->total_vframes;
> + ifv->total_vframes += nb_new_vframes;
> +
> + ret = read_index(s, AVMEDIA_TYPE_VIDEO);
> + if (ret < 0)
> + return ret;
> +
> + ifv->index_pos = ifv->total_aframes;
> + ifv->total_aframes += nb_new_aframes;
> +
> + ret = read_index(s, AVMEDIA_TYPE_AUDIO);
> + if (ret < 0)
> + return ret;
> +
> + pos = avio_tell(s->pb);
> + avio_skip(s->pb, ifv->vid_index[new_index_start].frame_offset - pos);
> +
> + return 0;
> +
> + } else if (!ifv->is_audio_present) {
> + /*read new video index*/
> +
> + avio_skip(s->pb, 0x1c);
> + nb_new_vframes = avio_rl32(s->pb);
> + avio_skip(s->pb, 0x10);
> +
> + if (avio_feof(s->pb))
> + return AVERROR_EOF;
> +
> + ifv->index_pos = new_index_start = ifv->total_vframes;
> + ifv->total_vframes += nb_new_vframes;
> +
> + ret = read_index(s, AVMEDIA_TYPE_VIDEO);
> + if (ret < 0)
> + return ret;
> +
> + pos = avio_tell(s->pb);
> + avio_skip(s->pb, ifv->vid_index[new_index_start].frame_offset - pos);
> +
> + return 0;
> + }
> + }
> +
> + ret = av_get_packet(s->pb, pkt, e->frame_size);
> + if (ret < 0)
> + return ret;
> +
> + pkt->stream_index = e->frame_type == AVMEDIA_TYPE_VIDEO?
> + ifv->video_stream_index: ifv->audio_stream_index;
> +
> + return ret;
> +}
> +
> +static int ifv_read_close(AVFormatContext *s)
> +{
> + IFVContext *ifv = s->priv_data;
> +
> + av_freep(&ifv->vid_index);
> + if (ifv->is_audio_present)
> + av_freep(&ifv->aud_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_close = ifv_read_close,
> + .flags = AVFMT_NOTIMESTAMPS | AVFMT_NODIMENSIONS,
> +};
> diff --git a/libavformat/version.h b/libavformat/version.h
> index d57c151554..52dd95f5c6 100644
> --- a/libavformat/version.h
> +++ b/libavformat/version.h
> @@ -32,8 +32,8 @@
> // Major bumping may affect Ticket5467, 5421, 5451(compatibility with Chromium)
> // Also please add any ticket numbers that you believe might be affected here
> #define LIBAVFORMAT_VERSION_MAJOR 58
> -#define LIBAVFORMAT_VERSION_MINOR 27
> -#define LIBAVFORMAT_VERSION_MICRO 102
> +#define LIBAVFORMAT_VERSION_MINOR 28
> +#define LIBAVFORMAT_VERSION_MICRO 100
>
> #define LIBAVFORMAT_VERSION_INT AV_VERSION_INT(LIBAVFORMAT_VERSION_MAJOR, \
> LIBAVFORMAT_VERSION_MINOR, \
> --
> 2.21.0
Ping. Please comment.
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