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https://git.ffmpeg.org/ffmpeg.git
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b800327f4c
This commit does for AVInputFormat what commit59c9dc82f4
did for AVOutputFormat: It adds a new type FFInputFormat, moves all the internals of AVInputFormat to it and adds a now reduced AVInputFormat as first member. This does not affect/improve extensibility of both public or private fields for demuxers (it is still a mess due to lavd). This is possible since50f34172e0
(which removed the last usage of an internal field of AVInputFormat in fftools). (Hint: tools/probetest.c accesses the internals of FFInputFormat as well, but given that it is a testing tool this is not considered a problem.) Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
219 lines
6.0 KiB
C
219 lines
6.0 KiB
C
/*
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* RAW EVC video demuxer
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*
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* Copyright (c) 2021 Dawid Kozinski <d.kozinski@samsung.com>
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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 "libavcodec/evc.h"
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#include "libavcodec/bsf.h"
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#include "libavutil/opt.h"
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#include "avformat.h"
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#include "avio_internal.h"
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#include "demux.h"
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#include "evc.h"
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#include "internal.h"
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#define RAW_PACKET_SIZE 1024
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typedef struct EVCDemuxContext {
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const AVClass *class;
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AVRational framerate;
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AVBSFContext *bsf;
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} EVCDemuxContext;
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#define DEC AV_OPT_FLAG_DECODING_PARAM
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#define OFFSET(x) offsetof(EVCDemuxContext, x)
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static const AVOption evc_options[] = {
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{ "framerate", "", OFFSET(framerate), AV_OPT_TYPE_VIDEO_RATE, {.str = "25"}, 0, INT_MAX, DEC},
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{ NULL },
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};
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#undef OFFSET
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static const AVClass evc_demuxer_class = {
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.class_name = "EVC Annex B demuxer",
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.item_name = av_default_item_name,
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.option = evc_options,
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.version = LIBAVUTIL_VERSION_INT,
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};
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static int annexb_probe(const AVProbeData *p)
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{
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int nalu_type;
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size_t nalu_size;
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int got_sps = 0, got_pps = 0, got_idr = 0, got_nonidr = 0;
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const unsigned char *bits = p->buf;
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int bytes_to_read = p->buf_size;
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while (bytes_to_read > EVC_NALU_LENGTH_PREFIX_SIZE) {
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nalu_size = evc_read_nal_unit_length(bits, EVC_NALU_LENGTH_PREFIX_SIZE);
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if (nalu_size == 0) break;
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bits += EVC_NALU_LENGTH_PREFIX_SIZE;
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bytes_to_read -= EVC_NALU_LENGTH_PREFIX_SIZE;
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if(bytes_to_read < nalu_size) break;
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nalu_type = evc_get_nalu_type(bits, bytes_to_read);
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if (nalu_type == EVC_SPS_NUT)
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got_sps++;
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else if (nalu_type == EVC_PPS_NUT)
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got_pps++;
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else if (nalu_type == EVC_IDR_NUT )
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got_idr++;
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else if (nalu_type == EVC_NOIDR_NUT)
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got_nonidr++;
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bits += nalu_size;
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bytes_to_read -= nalu_size;
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}
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if (got_sps && got_pps && (got_idr || got_nonidr > 3))
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return AVPROBE_SCORE_EXTENSION + 1; // 1 more than .mpg
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return 0;
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}
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static int evc_read_header(AVFormatContext *s)
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{
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AVStream *st;
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FFStream *sti;
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const AVBitStreamFilter *filter = av_bsf_get_by_name("evc_frame_merge");
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EVCDemuxContext *c = s->priv_data;
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int ret = 0;
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st = avformat_new_stream(s, NULL);
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if (!st) {
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ret = AVERROR(ENOMEM);
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goto fail;
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}
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sti = ffstream(st);
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st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
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st->codecpar->codec_id = AV_CODEC_ID_EVC;
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// This causes sending to the parser full frames, not chunks of data
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// The flag PARSER_FLAG_COMPLETE_FRAMES will be set in demux.c (demux.c: 1316)
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sti->need_parsing = AVSTREAM_PARSE_HEADERS;
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st->avg_frame_rate = c->framerate;
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// taken from rawvideo demuxers
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avpriv_set_pts_info(st, 64, 1, 1200000);
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ret = av_bsf_alloc(filter, &c->bsf);
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if (ret < 0)
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return ret;
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ret = avcodec_parameters_copy(c->bsf->par_in, st->codecpar);
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if (ret < 0)
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return ret;
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ret = av_bsf_init(c->bsf);
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if (ret < 0)
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return ret;
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fail:
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return ret;
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}
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static int evc_read_packet(AVFormatContext *s, AVPacket *pkt)
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{
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int ret;
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uint32_t nalu_size;
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int au_end_found = 0;
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EVCDemuxContext *const c = s->priv_data;
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while(!au_end_found) {
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uint8_t buf[EVC_NALU_LENGTH_PREFIX_SIZE];
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if (avio_feof(s->pb))
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goto end;
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ret = ffio_ensure_seekback(s->pb, EVC_NALU_LENGTH_PREFIX_SIZE);
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if (ret < 0)
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return ret;
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ret = avio_read(s->pb, buf, EVC_NALU_LENGTH_PREFIX_SIZE);
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if (ret < 0)
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return ret;
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if (ret != EVC_NALU_LENGTH_PREFIX_SIZE)
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return AVERROR_INVALIDDATA;
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nalu_size = evc_read_nal_unit_length(buf, EVC_NALU_LENGTH_PREFIX_SIZE);
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if (!nalu_size || nalu_size > INT_MAX)
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return AVERROR_INVALIDDATA;
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avio_seek(s->pb, -EVC_NALU_LENGTH_PREFIX_SIZE, SEEK_CUR);
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ret = av_get_packet(s->pb, pkt, nalu_size + EVC_NALU_LENGTH_PREFIX_SIZE);
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if (ret < 0)
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return ret;
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if (ret != (nalu_size + EVC_NALU_LENGTH_PREFIX_SIZE))
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return AVERROR_INVALIDDATA;
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end:
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ret = av_bsf_send_packet(c->bsf, pkt);
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if (ret < 0) {
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av_log(s, AV_LOG_ERROR, "Failed to send packet to "
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"evc_frame_merge filter\n");
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return ret;
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}
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ret = av_bsf_receive_packet(c->bsf, pkt);
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if (ret < 0 && ret != AVERROR(EAGAIN) && ret != AVERROR_EOF)
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av_log(s, AV_LOG_ERROR, "evc_frame_merge filter failed to "
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"send output packet\n");
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if (ret != AVERROR(EAGAIN))
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au_end_found = 1;
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}
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return ret;
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}
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static int evc_read_close(AVFormatContext *s)
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{
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EVCDemuxContext *const c = s->priv_data;
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av_bsf_free(&c->bsf);
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return 0;
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}
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const FFInputFormat ff_evc_demuxer = {
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.p.name = "evc",
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.p.long_name = NULL_IF_CONFIG_SMALL("EVC Annex B"),
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.p.extensions = "evc",
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.p.flags = AVFMT_GENERIC_INDEX | AVFMT_NOTIMESTAMPS,
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.p.priv_class = &evc_demuxer_class,
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.read_probe = annexb_probe,
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.read_header = evc_read_header, // annexb_read_header
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.read_packet = evc_read_packet, // annexb_read_packet
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.read_close = evc_read_close,
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.flags_internal = FF_FMT_INIT_CLEANUP,
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.raw_codec_id = AV_CODEC_ID_EVC,
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.priv_data_size = sizeof(EVCDemuxContext),
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};
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