* NuppelVideo demuxer.
* Copyright (c) 2006 Reimar Doeffinger
*
- * This file is part of Libav.
+ * This file is part of FFmpeg.
*
- * Libav is free software; you can redistribute it and/or
+ * 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.
*
- * Libav is distributed in the hope that it will be useful,
+ * 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 Libav; if not, write to the Free Software
+ * License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
* @param vst video stream of which to change parameters
* @param ast video stream of which to change parameters
* @param myth set if this is a MythTVVideo format file
- * @return 1 if all required codec data was found
+ * @return 0 or AVERROR code
*/
static int get_codec_data(AVIOContext *pb, AVStream *vst,
AVStream *ast, int myth)
if (!vst && !myth)
return 1; // no codec data needed
- while (!pb->eof_reached) {
+ while (!url_feof(pb)) {
int size, subtype;
frametype = avio_r8(pb);
avio_skip(pb, 6);
size = PKTSIZE(avio_rl32(pb));
if (vst && subtype == 'R') {
+ if (vst->codec->extradata) {
+ av_freep(&vst->codec->extradata);
+ vst->codec->extradata_size = 0;
+ }
+ vst->codec->extradata = av_malloc(size);
+ if (!vst->codec->extradata)
+ return AVERROR(ENOMEM);
vst->codec->extradata_size = size;
- vst->codec->extradata = av_malloc(size);
avio_read(pb, vst->codec->extradata, size);
size = 0;
if (!myth)
- return 1;
+ return 0;
}
break;
case NUV_MYTHEXT:
size -= 6 * 4;
avio_skip(pb, size);
- return 1;
+ return 0;
case NUV_SEEKP:
size = 11;
break;
AVIOContext *pb = s->pb;
char id_string[12];
double aspect, fps;
- int is_mythtv, width, height, v_packs, a_packs;
+ int is_mythtv, width, height, v_packs, a_packs, ret;
AVStream *vst = NULL, *ast = NULL;
avio_read(pb, id_string, 12);
} else
ctx->a_id = -1;
- get_codec_data(pb, vst, ast, is_mythtv);
+ if ((ret = get_codec_data(pb, vst, ast, is_mythtv)) < 0)
+ return ret;
+
ctx->rtjpg_video = vst && vst->codec->codec_id == AV_CODEC_ID_NUV;
return 0;
nuv_frametype frametype;
int ret, size;
- while (!pb->eof_reached) {
+ while (!url_feof(pb)) {
int copyhdrsize = ctx->rtjpg_video ? HDRSIZE : 0;
uint64_t pos = avio_tell(pb);
ret = av_new_packet(pkt, copyhdrsize + size);
if (ret < 0)
return ret;
- // HACK: we have no idea if it is a keyframe,
- // but if we mark none seeking will not work at all.
- pkt->flags |= AV_PKT_FLAG_KEY;
+
pkt->pos = pos;
+ pkt->flags |= hdr[2] == 0 ? AV_PKT_FLAG_KEY : 0;
pkt->pts = AV_RL32(&hdr[4]);
pkt->stream_index = ctx->v_id;
memcpy(pkt->data, hdr, copyhdrsize);
return AVERROR(EIO);
}
+/**
+ * \brief looks for the string RTjjjjjjjjjj in the stream too resync reading
+ * \return 1 if the syncword is found 0 otherwise.
+ */
+static int nuv_resync(AVFormatContext *s, int64_t pos_limit) {
+ AVIOContext *pb = s->pb;
+ uint32_t tag = 0;
+ while(!url_feof(pb) && avio_tell(pb) < pos_limit) {
+ tag = (tag << 8) | avio_r8(pb);
+ if (tag == MKBETAG('R','T','j','j') &&
+ (tag = avio_rb32(pb)) == MKBETAG('j','j','j','j') &&
+ (tag = avio_rb32(pb)) == MKBETAG('j','j','j','j'))
+ return 1;
+ }
+ return 0;
+}
+
+/**
+ * \brief attempts to read a timestamp from stream at the given stream position
+ * \return timestamp if successful and AV_NOPTS_VALUE if failure
+ */
+static int64_t nuv_read_dts(AVFormatContext *s, int stream_index,
+ int64_t *ppos, int64_t pos_limit)
+{
+ NUVContext *ctx = s->priv_data;
+ AVIOContext *pb = s->pb;
+ uint8_t hdr[HDRSIZE];
+ nuv_frametype frametype;
+ int size, key, idx;
+ int64_t pos, dts;
+
+ if (avio_seek(pb, *ppos, SEEK_SET) < 0)
+ return AV_NOPTS_VALUE;
+
+ if (!nuv_resync(s, pos_limit))
+ return AV_NOPTS_VALUE;
+
+ while (!url_feof(pb) && avio_tell(pb) < pos_limit) {
+ if (avio_read(pb, hdr, HDRSIZE) < HDRSIZE)
+ return AV_NOPTS_VALUE;
+ frametype = hdr[0];
+ size = PKTSIZE(AV_RL32(&hdr[8]));
+ switch (frametype) {
+ case NUV_SEEKP:
+ break;
+ case NUV_AUDIO:
+ case NUV_VIDEO:
+ if (frametype == NUV_VIDEO) {
+ idx = ctx->v_id;
+ key = hdr[2] == 0;
+ } else {
+ idx = ctx->a_id;
+ key = 1;
+ }
+ if (stream_index == idx) {
+
+ pos = avio_tell(s->pb) - HDRSIZE;
+ dts = AV_RL32(&hdr[4]);
+
+ // TODO - add general support in av_gen_search, so it adds positions after reading timestamps
+ av_add_index_entry(s->streams[stream_index], pos, dts, size + HDRSIZE, 0,
+ key ? AVINDEX_KEYFRAME : 0);
+
+ *ppos = pos;
+ return dts;
+ }
+ default:
+ avio_skip(pb, size);
+ break;
+ }
+ }
+ return AV_NOPTS_VALUE;
+}
+
+
AVInputFormat ff_nuv_demuxer = {
.name = "nuv",
.long_name = NULL_IF_CONFIG_SMALL("NuppelVideo"),
.read_probe = nuv_probe,
.read_header = nuv_header,
.read_packet = nuv_packet,
+ .read_timestamp = nuv_read_dts,
.flags = AVFMT_GENERIC_INDEX,
};
projects / ffmpeg / blobdiff