diff options
Diffstat (limited to 'libavformat/nuv.c')
| -rw-r--r-- | libavformat/nuv.c | 101 |
1 files changed, 88 insertions, 13 deletions
diff --git a/libavformat/nuv.c b/libavformat/nuv.c index 9336912..e7f0eea 100644 --- a/libavformat/nuv.c +++ b/libavformat/nuv.c @@ -2,20 +2,20 @@ * 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 */ @@ -72,7 +72,7 @@ static int get_codec_data(AVIOContext *pb, AVStream *vst, if (!vst && !myth) return 1; // no codec data needed - while (!pb->eof_reached) { + while (!avio_feof(pb)) { int size, subtype; frametype = avio_r8(pb); @@ -86,11 +86,8 @@ static int get_codec_data(AVIOContext *pb, AVStream *vst, av_freep(&vst->codec->extradata); vst->codec->extradata_size = 0; } - vst->codec->extradata = av_malloc(size); - if (!vst->codec->extradata) + if (ff_get_extradata(vst->codec, pb, size) < 0) return AVERROR(ENOMEM); - vst->codec->extradata_size = size; - avio_read(pb, vst->codec->extradata, size); size = 0; if (!myth) return 0; @@ -195,6 +192,9 @@ static int nuv_header(AVFormatContext *s) vst->codec->bits_per_coded_sample = 10; vst->sample_aspect_ratio = av_d2q(aspect * height / width, 10000); +#if FF_API_R_FRAME_RATE + vst->r_frame_rate = +#endif vst->avg_frame_rate = av_d2q(fps, 60000); avpriv_set_pts_info(vst, 32, 1, 1000); } else @@ -236,7 +236,7 @@ static int nuv_packet(AVFormatContext *s, AVPacket *pkt) nuv_frametype frametype; int ret, size; - while (!pb->eof_reached) { + while (!avio_feof(pb)) { int copyhdrsize = ctx->rtjpg_video ? HDRSIZE : 0; uint64_t pos = avio_tell(pb); @@ -262,10 +262,9 @@ static int nuv_packet(AVFormatContext *s, AVPacket *pkt) 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); @@ -303,6 +302,81 @@ static int nuv_packet(AVFormatContext *s, AVPacket *pkt) 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(!avio_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 (!avio_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"), @@ -310,5 +384,6 @@ AVInputFormat ff_nuv_demuxer = { .read_probe = nuv_probe, .read_header = nuv_header, .read_packet = nuv_packet, + .read_timestamp = nuv_read_dts, .flags = AVFMT_GENERIC_INDEX, }; |
