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https://gitee.com/openharmony/third_party_ffmpeg
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4bf90e095b
To make it consistent with other muxers. The user can still control the generic flushing behaviour after write_header (same way as after packets) using the -flush_packets option, the default typically means to flush unless a non-streamed file output is used. Therefore this change should have no adverse effect on streaming, even if it is assumed that the first packet has a clean buffer, so small seekbacks within the output buffer work even when the IO context is not seekable. Signed-off-by: Marton Balint <cus@passwd.hu>
147 lines
4.5 KiB
C
147 lines
4.5 KiB
C
/*
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* SMJPEG muxer
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* Copyright (c) 2012 Paul B Mahol
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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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/**
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* @file
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* This is a muxer for Loki SDL Motion JPEG files
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*/
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#include "avformat.h"
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#include "internal.h"
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#include "smjpeg.h"
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typedef struct SMJPEGMuxContext {
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uint32_t duration;
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} SMJPEGMuxContext;
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static int smjpeg_write_header(AVFormatContext *s)
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{
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AVDictionaryEntry *t = NULL;
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AVIOContext *pb = s->pb;
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int n, tag;
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if (s->nb_streams > 2) {
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av_log(s, AV_LOG_ERROR, "more than >2 streams are not supported\n");
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return AVERROR(EINVAL);
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}
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avio_write(pb, SMJPEG_MAGIC, 8);
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avio_wb32(pb, 0);
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avio_wb32(pb, 0);
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ff_standardize_creation_time(s);
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while ((t = av_dict_get(s->metadata, "", t, AV_DICT_IGNORE_SUFFIX))) {
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avio_wl32(pb, SMJPEG_TXT);
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avio_wb32(pb, strlen(t->key) + strlen(t->value) + 3);
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avio_write(pb, t->key, strlen(t->key));
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avio_write(pb, " = ", 3);
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avio_write(pb, t->value, strlen(t->value));
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}
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for (n = 0; n < s->nb_streams; n++) {
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AVStream *st = s->streams[n];
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AVCodecParameters *par = st->codecpar;
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if (par->codec_type == AVMEDIA_TYPE_AUDIO) {
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tag = ff_codec_get_tag(ff_codec_smjpeg_audio_tags, par->codec_id);
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if (!tag) {
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av_log(s, AV_LOG_ERROR, "unsupported audio codec\n");
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return AVERROR(EINVAL);
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}
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avio_wl32(pb, SMJPEG_SND);
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avio_wb32(pb, 8);
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avio_wb16(pb, par->sample_rate);
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avio_w8(pb, par->bits_per_coded_sample);
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avio_w8(pb, par->channels);
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avio_wl32(pb, tag);
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avpriv_set_pts_info(st, 32, 1, 1000);
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} else if (par->codec_type == AVMEDIA_TYPE_VIDEO) {
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tag = ff_codec_get_tag(ff_codec_smjpeg_video_tags, par->codec_id);
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if (!tag) {
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av_log(s, AV_LOG_ERROR, "unsupported video codec\n");
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return AVERROR(EINVAL);
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}
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avio_wl32(pb, SMJPEG_VID);
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avio_wb32(pb, 12);
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avio_wb32(pb, 0);
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avio_wb16(pb, par->width);
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avio_wb16(pb, par->height);
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avio_wl32(pb, tag);
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avpriv_set_pts_info(st, 32, 1, 1000);
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}
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}
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avio_wl32(pb, SMJPEG_HEND);
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return 0;
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}
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static int smjpeg_write_packet(AVFormatContext *s, AVPacket *pkt)
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{
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SMJPEGMuxContext *smc = s->priv_data;
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AVIOContext *pb = s->pb;
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AVStream *st = s->streams[pkt->stream_index];
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AVCodecParameters *par = st->codecpar;
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if (par->codec_type == AVMEDIA_TYPE_AUDIO)
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avio_wl32(pb, SMJPEG_SNDD);
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else if (par->codec_type == AVMEDIA_TYPE_VIDEO)
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avio_wl32(pb, SMJPEG_VIDD);
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else
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return 0;
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avio_wb32(pb, pkt->pts);
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avio_wb32(pb, pkt->size);
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avio_write(pb, pkt->data, pkt->size);
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smc->duration = FFMAX(smc->duration, pkt->pts + pkt->duration);
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return 0;
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}
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static int smjpeg_write_trailer(AVFormatContext *s)
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{
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SMJPEGMuxContext *smc = s->priv_data;
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AVIOContext *pb = s->pb;
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int64_t currentpos;
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if (pb->seekable & AVIO_SEEKABLE_NORMAL) {
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currentpos = avio_tell(pb);
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avio_seek(pb, 12, SEEK_SET);
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avio_wb32(pb, smc->duration);
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avio_seek(pb, currentpos, SEEK_SET);
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}
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avio_wl32(pb, SMJPEG_DONE);
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return 0;
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}
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AVOutputFormat ff_smjpeg_muxer = {
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.name = "smjpeg",
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.long_name = NULL_IF_CONFIG_SMALL("Loki SDL MJPEG"),
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.priv_data_size = sizeof(SMJPEGMuxContext),
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.audio_codec = AV_CODEC_ID_PCM_S16LE,
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.video_codec = AV_CODEC_ID_MJPEG,
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.write_header = smjpeg_write_header,
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.write_packet = smjpeg_write_packet,
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.write_trailer = smjpeg_write_trailer,
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.flags = AVFMT_GLOBALHEADER | AVFMT_TS_NONSTRICT,
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.codec_tag = (const AVCodecTag *const []){ ff_codec_smjpeg_video_tags, ff_codec_smjpeg_audio_tags, 0 },
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};
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