mirror of https://git.ffmpeg.org/ffmpeg.git
157 lines
3.7 KiB
C
157 lines
3.7 KiB
C
/*
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* FLV encoder.
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* Copyright (c) 2003 The FFmpeg Project.
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*
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* This library 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 of the License, or (at your option) any later version.
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*
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* This library 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 this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "avformat.h"
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unsigned int get_be24(ByteIOContext *s)
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{
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unsigned int val;
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val = get_byte(s) << 16;
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val |= get_byte(s) << 8;
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val |= get_byte(s);
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return val;
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}
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static int flv_probe(AVProbeData *p)
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{
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const uint8_t *d;
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if (p->buf_size < 6)
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return 0;
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d = p->buf;
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if (d[0] == 'F' && d[1] == 'L' && d[2] == 'V') {
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return 50;
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}
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return 0;
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}
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static int flv_read_header(AVFormatContext *s,
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AVFormatParameters *ap)
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{
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int offset, flags;
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AVStream *st;
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av_set_pts_info(s, 24, 1, 1000); /* 24 bit pts in ms */
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url_fskip(&s->pb, 4);
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flags = get_byte(&s->pb);
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if ((flags & 1)) {
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st = av_new_stream(s, 0);
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if (!st)
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return AVERROR_NOMEM;
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st->codec.codec_type = CODEC_TYPE_VIDEO;
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st->codec.codec_id = CODEC_ID_FLV1;
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}
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if ((flags & 4)) {
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st = av_new_stream(s, 1);
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if (!st)
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return AVERROR_NOMEM;
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st->codec.codec_type = CODEC_TYPE_AUDIO;
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st->codec.codec_id = CODEC_ID_MP3LAME;
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}
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offset = get_be32(&s->pb);
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url_fseek(&s->pb, offset, SEEK_SET);
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return 0;
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}
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static int flv_read_packet(AVFormatContext *s, AVPacket *pkt)
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{
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int ret, i, type, size, pts, flags;
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AVStream *st;
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redo:
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url_fskip(&s->pb, 4); /* size of previous packet */
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type = get_byte(&s->pb);
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size = get_be24(&s->pb);
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pts = get_be24(&s->pb);
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if (url_feof(&s->pb))
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return -EIO;
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url_fskip(&s->pb, 4); /* reserved */
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flags = 0;
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if (type == 8) {
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flags = get_byte(&s->pb);
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size--;
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if ((flags >> 4) != 2) { /* 0: uncompressed 1: ADPCM 2: mp3 5: Nellymoser 8kHz mono 6: Nellymoser*/
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goto skip;
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}
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} else if (type == 9) {
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flags = get_byte(&s->pb);
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size--;
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if ((flags & 0xF) != 2) { /* 2: only format */
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goto skip;
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}
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} else {
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skip:
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/* skip packet */
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printf("skipping flv packet: type %d, size %d, flags %d\n", type, size, flags);
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url_fskip(&s->pb, size);
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goto redo;
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}
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/* now find stream */
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for(i=0;i<s->nb_streams;i++) {
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st = s->streams[i];
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if (st->id == ((type == 9) ? 0 : 1))
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goto found;
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}
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goto skip;
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found:
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if (av_new_packet(pkt, size) < 0)
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return -EIO;
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ret = get_buffer(&s->pb, pkt->data, size);
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if (ret <= 0) {
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av_free_packet(pkt);
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return -EIO;
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}
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/* note: we need to modify the packet size here to handle the last
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packet */
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pkt->size = ret;
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pkt->pts = pts;
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pkt->stream_index = st->index;
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return ret;
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}
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static int flv_read_close(AVFormatContext *s)
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{
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return 0;
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}
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AVInputFormat flv_iformat = {
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"flv",
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"flv format",
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0,
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flv_probe,
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flv_read_header,
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flv_read_packet,
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flv_read_close,
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.extensions = "flv",
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.value = CODEC_ID_FLV1,
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};
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int flvdec_init(void)
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{
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av_register_input_format(&flv_iformat);
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return 0;
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}
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