* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
-#include "libavutil/avassert.h"
+#include "libavutil/parseutils.h"
#include "avio_internal.h"
#include "avformat.h"
#include "internal.h"
typedef struct DHAVContext {
unsigned type;
+ unsigned subtype;
+ unsigned channel;
+ unsigned frame_subnumber;
+ unsigned frame_number;
+ unsigned date;
+ unsigned timestamp;
int width, height;
int video_codec;
int frame_rate;
- int channels;
+ int audio_channels;
int audio_codec;
int sample_rate;
- int64_t pts;
+ int64_t last_good_pos;
+ int64_t duration;
int video_stream_index;
int audio_stream_index;
} DHAVContext;
-static int dhav_probe(AVProbeData *p)
+typedef struct DHAVStream {
+ int64_t last_timestamp;
+ int64_t last_time;
+ int64_t pts;
+} DHAVStream;
+
+static int dhav_probe(const AVProbeData *p)
{
if (!memcmp(p->buf, "DAHUA", 5))
return AVPROBE_SCORE_MAX;
return 0;
}
-static int dhav_read_header(AVFormatContext *s)
-{
- DHAVContext *dhav = s->priv_data;
- uint8_t signature[5];
-
- ffio_ensure_seekback(s->pb, 5);
- avio_read(s->pb, signature, sizeof(signature));
- if (!memcmp(signature, "DAHUA", 5))
- avio_skip(s->pb, 0x400 - 5);
- else
- avio_seek(s->pb, -5, SEEK_CUR);
-
- s->ctx_flags |= AVFMTCTX_NOHEADER;
- dhav->video_stream_index = -1;
- dhav->audio_stream_index = -1;
-
- return 0;
-}
-
static const uint32_t sample_rates[] = {
8000, 4000, 8000, 11025, 16000,
20000, 22050, 32000, 44100, 48000,
static int parse_ext(AVFormatContext *s, int length)
{
DHAVContext *dhav = s->priv_data;
- int index;
+ int index, ret = 0;
while (length > 0) {
int type = avio_r8(s->pb);
switch (type) {
case 0x80:
- avio_skip(s->pb, 1);
+ ret = avio_skip(s->pb, 1);
dhav->width = 8 * avio_r8(s->pb);
dhav->height = 8 * avio_r8(s->pb);
length -= 4;
break;
case 0x81:
- avio_skip(s->pb, 1);
+ ret = avio_skip(s->pb, 1);
dhav->video_codec = avio_r8(s->pb);
dhav->frame_rate = avio_r8(s->pb);
length -= 4;
break;
case 0x82:
- avio_skip(s->pb, 3);
+ ret = avio_skip(s->pb, 3);
dhav->width = avio_rl16(s->pb);
dhav->height = avio_rl16(s->pb);
length -= 8;
break;
case 0x83:
- dhav->channels = avio_r8(s->pb);
+ dhav->audio_channels = avio_r8(s->pb);
dhav->audio_codec = avio_r8(s->pb);
index = avio_r8(s->pb);
if (index < FF_ARRAY_ELEMS(sample_rates)) {
length -= 4;
break;
case 0x88:
- avio_skip(s->pb, 7);
+ ret = avio_skip(s->pb, 7);
length -= 8;
break;
case 0x8c:
- avio_skip(s->pb, 1);
- dhav->channels = avio_r8(s->pb);
+ ret = avio_skip(s->pb, 1);
+ dhav->audio_channels = avio_r8(s->pb);
dhav->audio_codec = avio_r8(s->pb);
index = avio_r8(s->pb);
if (index < FF_ARRAY_ELEMS(sample_rates)) {
} else {
dhav->sample_rate = 8000;
}
- avio_skip(s->pb, 3);
+ ret = avio_skip(s->pb, 3);
length -= 8;
break;
case 0x91:
case 0x9a:
case 0x9b: // sample aspect ratio
case 0xb3:
- avio_skip(s->pb, 7);
+ ret = avio_skip(s->pb, 7);
length -= 8;
break;
case 0x84:
case 0xa0:
case 0xb2:
case 0xb4:
- avio_skip(s->pb, 3);
+ ret = avio_skip(s->pb, 3);
length -= 4;
break;
default:
av_log(s, AV_LOG_INFO, "Unknown type: %X, skipping rest of header.\n", type);
- avio_skip(s->pb, length - 1);
+ ret = avio_skip(s->pb, length - 1);
length = 0;
}
+
+ if (ret < 0)
+ return ret;
}
return 0;
static int read_chunk(AVFormatContext *s)
{
DHAVContext *dhav = s->priv_data;
- unsigned size, skip;
+ int frame_length, ext_length;
int64_t start, end;
int ret;
- start = avio_tell(s->pb);
-
if (avio_feof(s->pb))
return AVERROR_EOF;
- if (avio_rl32(s->pb) != MKTAG('D','H','A','V'))
- return AVERROR_INVALIDDATA;
+ if (avio_rl32(s->pb) != MKTAG('D','H','A','V')) {
+ dhav->last_good_pos += 0x8000;
+ avio_seek(s->pb, dhav->last_good_pos, SEEK_SET);
+
+ while (avio_rl32(s->pb) != MKTAG('D','H','A','V')) {
+ if (avio_feof(s->pb))
+ return AVERROR_EOF;
+ dhav->last_good_pos += 0x8000;
+ ret = avio_skip(s->pb, 0x8000 - 4);
+ if (ret < 0)
+ return ret;
+ }
+ }
+ start = avio_tell(s->pb) - 4;
+ dhav->last_good_pos = start;
dhav->type = avio_r8(s->pb);
- avio_skip(s->pb, 3);
- dhav->pts = avio_rl32(s->pb);
- size = avio_rl32(s->pb);
- if (size < 24)
+ dhav->subtype = avio_r8(s->pb);
+ dhav->channel = avio_r8(s->pb);
+ dhav->frame_subnumber = avio_r8(s->pb);
+ dhav->frame_number = avio_rl32(s->pb);
+ frame_length = avio_rl32(s->pb);
+ dhav->date = avio_rl32(s->pb);
+
+ if (frame_length < 24)
return AVERROR_INVALIDDATA;
if (dhav->type == 0xf1) {
- avio_skip(s->pb, size - 16);
- return 0;
+ ret = avio_skip(s->pb, frame_length - 20);
+ return ret < 0 ? ret : 0;
}
- avio_rl32(s->pb);
- avio_skip(s->pb, 2);
- skip = avio_r8(s->pb);
- avio_skip(s->pb, 1);
+ dhav->timestamp = avio_rl16(s->pb);
+ ext_length = avio_r8(s->pb);
+ avio_skip(s->pb, 1); // checksum
- ret = parse_ext(s, skip);
+ ret = parse_ext(s, ext_length);
if (ret < 0)
return ret;
end = avio_tell(s->pb);
- return size - 8 - (end - start);
+ return frame_length - 8 - (end - start);
}
-static int dhav_read_packet(AVFormatContext *s, AVPacket *pkt)
+static void get_timeinfo(unsigned date, struct tm *timeinfo)
+{
+ int year, month, day, hour, min, sec;
+
+ sec = date & 0x3F;
+ min = (date >> 6) & 0x3F;
+ hour = (date >> 12) & 0x1F;
+ day = (date >> 17) & 0x1F;
+ month = (date >> 22) & 0x0F;
+ year = ((date >> 26) & 0x3F) + 2000;
+
+ timeinfo->tm_year = year - 1900;
+ timeinfo->tm_mon = month - 1;
+ timeinfo->tm_mday = day;
+ timeinfo->tm_hour = hour;
+ timeinfo->tm_min = min;
+ timeinfo->tm_sec = sec;
+}
+
+static int64_t get_duration(AVFormatContext *s)
{
DHAVContext *dhav = s->priv_data;
- int64_t start;
- int ret;
+ int64_t start_pos = avio_tell(s->pb);
+ int64_t start = 0, end = 0;
+ struct tm timeinfo;
+
+ if (!s->pb->seekable)
+ return 0;
+
+ avio_seek(s->pb, avio_size(s->pb) - 8, SEEK_SET);
+ if (avio_rl32(s->pb) == MKTAG('d','h','a','v')) {
+ int seek_back = avio_rl32(s->pb);
+
+ avio_seek(s->pb, -seek_back, SEEK_CUR);
+ read_chunk(s);
+ get_timeinfo(dhav->date, &timeinfo);
+ end = av_timegm(&timeinfo) * 1000LL;
+ } else {
+ avio_seek(s->pb, start_pos, SEEK_SET);
+ return 0;
+ }
+
+ avio_seek(s->pb, start_pos, SEEK_SET);
+
+ read_chunk(s);
+ get_timeinfo(dhav->date, &timeinfo);
+ start = av_timegm(&timeinfo) * 1000LL;
+
+ avio_seek(s->pb, start_pos, SEEK_SET);
+
+ return end - start;
+}
+
+static int dhav_read_header(AVFormatContext *s)
+{
+ DHAVContext *dhav = s->priv_data;
+ uint8_t signature[5];
+
+ ffio_ensure_seekback(s->pb, 5);
+ avio_read(s->pb, signature, sizeof(signature));
+ if (!memcmp(signature, "DAHUA", 5)) {
+ avio_skip(s->pb, 0x400 - 5);
+ dhav->last_good_pos = avio_tell(s->pb);
+ } else {
+ if (!memcmp(signature, "DHAV", 4)) {
+ avio_seek(s->pb, -5, SEEK_CUR);
+ dhav->last_good_pos = avio_tell(s->pb);
+ } else if (s->pb->seekable) {
+ avio_seek(s->pb, avio_size(s->pb) - 8, SEEK_SET);
+ while (avio_rl32(s->pb) == MKTAG('d','h','a','v')) {
+ int seek_back;
+
+ seek_back = avio_rl32(s->pb) + 8;
+ dhav->last_good_pos = avio_tell(s->pb);
+ avio_seek(s->pb, -seek_back, SEEK_CUR);
+ }
+ avio_seek(s->pb, dhav->last_good_pos, SEEK_SET);
+ }
+ }
- start = avio_tell(s->pb);
+ dhav->duration = get_duration(s);
+ dhav->last_good_pos = avio_tell(s->pb);
+ s->ctx_flags |= AVFMTCTX_NOHEADER;
+ dhav->video_stream_index = -1;
+ dhav->audio_stream_index = -1;
+ return 0;
+}
+
+static int64_t get_pts(AVFormatContext *s, int stream_index)
+{
+ DHAVStream *dst = s->streams[stream_index]->priv_data;
+ DHAVContext *dhav = s->priv_data;
+ struct tm timeinfo;
+ time_t t;
+
+ get_timeinfo(dhav->date, &timeinfo);
+
+ t = av_timegm(&timeinfo);
+ if (dst->last_time == t) {
+ int64_t diff = dhav->timestamp - dst->last_timestamp;
+
+ if (diff < 0)
+ diff += 65535;
+ dst->pts += diff;
+ } else {
+ dst->pts = t * 1000LL;
+ }
+
+ dst->last_time = t;
+ dst->last_timestamp = dhav->timestamp;
+
+ return dst->pts;
+}
+
+static int dhav_read_packet(AVFormatContext *s, AVPacket *pkt)
+{
+ DHAVContext *dhav = s->priv_data;
+ int size, ret, stream_index;
+
+retry:
while ((ret = read_chunk(s)) == 0)
;
if (dhav->type == 0xfd && dhav->video_stream_index == -1) {
AVStream *st = avformat_new_stream(s, NULL);
+ DHAVStream *dst;
if (!st)
return AVERROR(ENOMEM);
case 0xc: st->codecpar->codec_id = AV_CODEC_ID_HEVC; break;
default: avpriv_request_sample(s, "Unknown video codec %X\n", dhav->video_codec);
}
+ st->duration = dhav->duration;
st->codecpar->width = dhav->width;
st->codecpar->height = dhav->height;
+ st->avg_frame_rate.num = dhav->frame_rate;
+ st->avg_frame_rate.den = 1;
+ st->priv_data = dst = av_mallocz(sizeof(DHAVStream));
+ if (!st->priv_data)
+ return AVERROR(ENOMEM);
+ dst->last_time = AV_NOPTS_VALUE;
dhav->video_stream_index = st->index;
- avpriv_set_pts_info(st, 64, 1, dhav->frame_rate);
+ avpriv_set_pts_info(st, 64, 1, 1000);
} else if (dhav->type == 0xf0 && dhav->audio_stream_index == -1) {
AVStream *st = avformat_new_stream(s, NULL);
+ DHAVStream *dst;
if (!st)
return AVERROR(ENOMEM);
case 0x0d: st->codecpar->codec_id = AV_CODEC_ID_ADPCM_MS; break;
default: avpriv_request_sample(s, "Unknown audio codec %X\n", dhav->audio_codec);
}
- st->codecpar->channels = dhav->channels;
+ st->duration = dhav->duration;
+ st->codecpar->channels = dhav->audio_channels;
st->codecpar->sample_rate = dhav->sample_rate;
+ st->priv_data = dst = av_mallocz(sizeof(DHAVStream));
+ if (!st->priv_data)
+ return AVERROR(ENOMEM);
+ dst->last_time = AV_NOPTS_VALUE;
dhav->audio_stream_index = st->index;
- avpriv_set_pts_info(st, 64, ret, dhav->sample_rate);
+ avpriv_set_pts_info(st, 64, 1, 1000);
+ }
+
+ stream_index = dhav->type == 0xf0 ? dhav->audio_stream_index : dhav->video_stream_index;
+ if (stream_index < 0) {
+ avio_skip(s->pb, ret);
+ if (avio_rl32(s->pb) == MKTAG('d','h','a','v'))
+ avio_skip(s->pb, 4);
+ goto retry;
}
- ret = av_get_packet(s->pb, pkt, ret);
+ size = ret;
+ ret = av_get_packet(s->pb, pkt, size);
if (ret < 0)
return ret;
- pkt->stream_index = dhav->type == 0xf0 ? dhav->audio_stream_index : dhav->video_stream_index;
+ pkt->stream_index = stream_index;
if (dhav->type != 0xfc)
pkt->flags |= AV_PKT_FLAG_KEY;
- pkt->pts = dhav->pts;
pkt->duration = 1;
- pkt->pos = start;
- if (avio_rl32(s->pb) != MKTAG('d','h','a','v'))
- return AVERROR_INVALIDDATA;
- avio_skip(s->pb, 4);
+ if (pkt->stream_index >= 0)
+ pkt->pts = get_pts(s, pkt->stream_index);
+ pkt->pos = dhav->last_good_pos;
+ if (avio_rl32(s->pb) == MKTAG('d','h','a','v'))
+ avio_skip(s->pb, 4);
return ret;
}
+static int dhav_read_seek(AVFormatContext *s, int stream_index,
+ int64_t timestamp, int flags)
+{
+ DHAVContext *dhav = s->priv_data;
+ AVStream *st = s->streams[stream_index];
+ int index = av_index_search_timestamp(st, timestamp, flags);
+ int64_t pts;
+
+ if (index < 0)
+ return -1;
+ if (avio_seek(s->pb, st->index_entries[index].pos, SEEK_SET) < 0)
+ return -1;
+
+ pts = st->index_entries[index].timestamp;
+
+ for (int n = 0; n < s->nb_streams; n++) {
+ AVStream *st = s->streams[n];
+ DHAVStream *dst = st->priv_data;
+
+ dst->pts = pts;
+ dst->last_time = AV_NOPTS_VALUE;
+ }
+ dhav->last_good_pos = avio_tell(s->pb);
+
+ return 0;
+}
+
AVInputFormat ff_dhav_demuxer = {
.name = "dhav",
.long_name = NULL_IF_CONFIG_SMALL("Video DAV"),
.read_probe = dhav_probe,
.read_header = dhav_read_header,
.read_packet = dhav_read_packet,
+ .read_seek = dhav_read_seek,
.extensions = "dav",
- .flags = AVFMT_GENERIC_INDEX | AVFMT_NO_BYTE_SEEK,
+ .flags = AVFMT_GENERIC_INDEX | AVFMT_NO_BYTE_SEEK | AVFMT_TS_DISCONT | AVFMT_TS_NONSTRICT,
};
projects / ffmpeg / blobdiff