mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-11-21 10:55:51 +02:00
569 lines
13 KiB
C
569 lines
13 KiB
C
/*
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* RAW encoder and decoder
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* Copyright (c) 2001 Fabrice Bellard.
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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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/* simple formats */
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static int raw_write_header(struct AVFormatContext *s)
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{
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return 0;
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}
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static int raw_write_packet(struct AVFormatContext *s, int stream_index,
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unsigned char *buf, int size, int force_pts)
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{
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put_buffer(&s->pb, buf, size);
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put_flush_packet(&s->pb);
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return 0;
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}
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static int raw_write_trailer(struct AVFormatContext *s)
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{
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return 0;
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}
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/* raw input */
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static int raw_read_header(AVFormatContext *s, AVFormatParameters *ap)
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{
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AVStream *st;
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int id;
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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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if (ap) {
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id = s->iformat->value;
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if (id == CODEC_ID_RAWVIDEO) {
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st->codec.codec_type = CODEC_TYPE_VIDEO;
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} else {
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st->codec.codec_type = CODEC_TYPE_AUDIO;
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}
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st->codec.codec_id = id;
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switch(st->codec.codec_type) {
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case CODEC_TYPE_AUDIO:
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st->codec.sample_rate = ap->sample_rate;
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st->codec.channels = ap->channels;
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break;
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case CODEC_TYPE_VIDEO:
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st->codec.frame_rate = ap->frame_rate;
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st->codec.frame_rate_base = ap->frame_rate_base;
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st->codec.width = ap->width;
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st->codec.height = ap->height;
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break;
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default:
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return -1;
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}
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} else {
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return -1;
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}
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return 0;
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}
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#define RAW_PACKET_SIZE 1024
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static int raw_read_packet(AVFormatContext *s, AVPacket *pkt)
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{
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int ret, size;
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// AVStream *st = s->streams[0];
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size= RAW_PACKET_SIZE;
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if (av_new_packet(pkt, size) < 0)
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return -EIO;
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pkt->stream_index = 0;
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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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return ret;
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}
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static int raw_read_close(AVFormatContext *s)
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{
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return 0;
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}
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/* mp3 read */
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static int mp3_read_header(AVFormatContext *s,
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AVFormatParameters *ap)
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{
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AVStream *st;
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int pos;
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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_AUDIO;
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st->codec.codec_id = CODEC_ID_MP2;
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/* looking for 11111111 111MMLLC - MPEG synchronization tag
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MM: 00 - MPEG-2.5, 10 - MPEG-2, 11 - MPEG-1
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LL: 11 - Layer I, 10 - Layer II, 01 - Layer III
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XXX: this code does not read more bytes from file
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so if ID3 (or other stuff) length > IO_BUFFER_SIZE it fails back to CODEC_ID_MP2 */
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for(pos=0; pos < s->pb.buffer_size-1; pos++)
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if( s->pb.buffer[pos] == 0xFF && (s->pb.buffer[pos] & 0xE0) == 0xE0 )
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break;
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if( pos < s->pb.buffer_size-1 && (s->pb.buffer[pos+1] & 6) == 2 )
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st->codec.codec_id = CODEC_ID_MP3LAME;
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/* the parameters will be extracted from the compressed bitstream */
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return 0;
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}
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/* ac3 read */
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static int ac3_read_header(AVFormatContext *s,
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AVFormatParameters *ap)
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{
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AVStream *st;
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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_AUDIO;
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st->codec.codec_id = CODEC_ID_AC3;
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/* the parameters will be extracted from the compressed bitstream */
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return 0;
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}
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/* mpeg1/h263 input */
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static int video_read_header(AVFormatContext *s,
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AVFormatParameters *ap)
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{
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AVStream *st;
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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 = s->iformat->value;
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/* for mjpeg, specify frame rate */
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/* for mpeg4 specify it too (most mpeg4 streams dont have the fixed_vop_rate set ...)*/
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if (st->codec.codec_id == CODEC_ID_MJPEG || st->codec.codec_id == CODEC_ID_MPEG4) {
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if (ap) {
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st->codec.frame_rate = ap->frame_rate;
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st->codec.frame_rate_base = ap->frame_rate_base;
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} else {
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st->codec.frame_rate = 25;
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st->codec.frame_rate_base = 1;
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}
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}
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return 0;
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}
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#define SEQ_START_CODE 0x000001b3
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#define GOP_START_CODE 0x000001b8
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#define PICTURE_START_CODE 0x00000100
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/* XXX: improve that by looking at several start codes */
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static int mpegvideo_probe(AVProbeData *p)
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{
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int code;
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const uint8_t *d;
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/* we search the first start code. If it is a sequence, gop or
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picture start code then we decide it is an mpeg video
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stream. We do not send highest value to give a chance to mpegts */
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/* NOTE: the search range was restricted to avoid too many false
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detections */
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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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code = (d[0] << 24) | (d[1] << 16) | (d[2] << 8) | (d[3]);
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if ((code & 0xffffff00) == 0x100) {
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if (code == SEQ_START_CODE ||
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code == GOP_START_CODE ||
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code == PICTURE_START_CODE)
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return 50 - 1;
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else
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return 0;
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}
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return 0;
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}
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AVInputFormat mp3_iformat = {
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"mp3",
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"MPEG audio",
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0,
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NULL,
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mp3_read_header,
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raw_read_packet,
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raw_read_close,
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.extensions = "mp2,mp3", /* XXX: use probe */
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};
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AVOutputFormat mp2_oformat = {
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"mp2",
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"MPEG audio layer 2",
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"audio/x-mpeg",
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"mp2,mp3",
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0,
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CODEC_ID_MP2,
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0,
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raw_write_header,
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raw_write_packet,
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raw_write_trailer,
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};
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AVInputFormat ac3_iformat = {
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"ac3",
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"raw ac3",
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0,
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NULL,
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ac3_read_header,
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raw_read_packet,
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raw_read_close,
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.extensions = "ac3",
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};
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AVOutputFormat ac3_oformat = {
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"ac3",
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"raw ac3",
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"audio/x-ac3",
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"ac3",
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0,
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CODEC_ID_AC3,
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0,
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raw_write_header,
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raw_write_packet,
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raw_write_trailer,
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};
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AVOutputFormat h263_oformat = {
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"h263",
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"raw h263",
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"video/x-h263",
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"h263",
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0,
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0,
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CODEC_ID_H263,
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raw_write_header,
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raw_write_packet,
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raw_write_trailer,
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};
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AVInputFormat m4v_iformat = {
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"m4v",
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"raw MPEG4 video format",
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0,
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NULL /*mpegvideo_probe*/,
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video_read_header,
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raw_read_packet,
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raw_read_close,
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.extensions = "m4v", //FIXME remove after writing mpeg4_probe
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.value = CODEC_ID_MPEG4,
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};
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AVOutputFormat m4v_oformat = {
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"m4v",
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"raw MPEG4 video format",
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NULL,
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"m4v",
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0,
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CODEC_ID_NONE,
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CODEC_ID_MPEG4,
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raw_write_header,
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raw_write_packet,
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raw_write_trailer,
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};
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AVInputFormat h264_iformat = {
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"h264",
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"raw H264 video format",
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0,
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NULL /*mpegvideo_probe*/,
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video_read_header,
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raw_read_packet,
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raw_read_close,
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.extensions = "h26l,h264", //FIXME remove after writing mpeg4_probe
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.value = CODEC_ID_H264,
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};
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AVOutputFormat h264_oformat = {
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"h264",
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"raw H264 video format",
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NULL,
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"h264",
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0,
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CODEC_ID_NONE,
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CODEC_ID_H264,
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raw_write_header,
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raw_write_packet,
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raw_write_trailer,
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};
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AVInputFormat mpegvideo_iformat = {
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"mpegvideo",
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"MPEG video",
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0,
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mpegvideo_probe,
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video_read_header,
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raw_read_packet,
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raw_read_close,
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.value = CODEC_ID_MPEG1VIDEO,
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};
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AVOutputFormat mpeg1video_oformat = {
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"mpeg1video",
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"MPEG video",
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"video/x-mpeg",
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"mpg,mpeg",
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0,
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0,
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CODEC_ID_MPEG1VIDEO,
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raw_write_header,
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raw_write_packet,
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raw_write_trailer,
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};
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AVInputFormat mjpeg_iformat = {
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"mjpeg",
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"MJPEG video",
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0,
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NULL,
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video_read_header,
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raw_read_packet,
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raw_read_close,
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.extensions = "mjpg,mjpeg",
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.value = CODEC_ID_MJPEG,
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};
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AVOutputFormat mjpeg_oformat = {
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"mjpeg",
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"MJPEG video",
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"video/x-mjpeg",
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"mjpg,mjpeg",
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0,
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0,
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CODEC_ID_MJPEG,
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raw_write_header,
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raw_write_packet,
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raw_write_trailer,
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};
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/* pcm formats */
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#define PCMDEF(name, long_name, ext, codec) \
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AVInputFormat pcm_ ## name ## _iformat = {\
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#name,\
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long_name,\
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0,\
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NULL,\
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raw_read_header,\
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raw_read_packet,\
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raw_read_close,\
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.extensions = ext,\
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.value = codec,\
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};\
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\
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AVOutputFormat pcm_ ## name ## _oformat = {\
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#name,\
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long_name,\
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NULL,\
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ext,\
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0,\
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codec,\
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0,\
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raw_write_header,\
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raw_write_packet,\
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raw_write_trailer,\
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};
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#ifdef WORDS_BIGENDIAN
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#define BE_DEF(s) s
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#define LE_DEF(s) NULL
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#else
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#define BE_DEF(s) NULL
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#define LE_DEF(s) s
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#endif
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PCMDEF(s16le, "pcm signed 16 bit little endian format",
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LE_DEF("sw"), CODEC_ID_PCM_S16LE)
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PCMDEF(s16be, "pcm signed 16 bit big endian format",
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BE_DEF("sw"), CODEC_ID_PCM_S16BE)
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PCMDEF(u16le, "pcm unsigned 16 bit little endian format",
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LE_DEF("uw"), CODEC_ID_PCM_U16LE)
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PCMDEF(u16be, "pcm unsigned 16 bit big endian format",
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BE_DEF("uw"), CODEC_ID_PCM_U16BE)
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PCMDEF(s8, "pcm signed 8 bit format",
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"sb", CODEC_ID_PCM_S8)
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PCMDEF(u8, "pcm unsigned 8 bit format",
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"ub", CODEC_ID_PCM_U8)
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PCMDEF(mulaw, "pcm mu law format",
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"ul", CODEC_ID_PCM_MULAW)
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PCMDEF(alaw, "pcm A law format",
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"al", CODEC_ID_PCM_ALAW)
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static int rawvideo_read_packet(AVFormatContext *s, AVPacket *pkt)
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{
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int packet_size, ret, width, height;
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AVStream *st = s->streams[0];
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width = st->codec.width;
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height = st->codec.height;
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switch(st->codec.pix_fmt) {
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case PIX_FMT_YUV420P:
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packet_size = (width * height * 3) / 2;
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break;
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case PIX_FMT_YUV422:
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packet_size = (width * height * 2);
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break;
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case PIX_FMT_BGR24:
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case PIX_FMT_RGB24:
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packet_size = (width * height * 3);
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break;
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default:
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av_abort();
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break;
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}
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if (av_new_packet(pkt, packet_size) < 0)
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return -EIO;
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pkt->stream_index = 0;
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#if 0
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/* bypass buffered I/O */
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ret = url_read(url_fileno(&s->pb), pkt->data, pkt->size);
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#else
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ret = get_buffer(&s->pb, pkt->data, pkt->size);
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#endif
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if (ret != pkt->size) {
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av_free_packet(pkt);
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return -EIO;
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} else {
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return 0;
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}
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}
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AVInputFormat rawvideo_iformat = {
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"rawvideo",
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"raw video format",
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0,
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NULL,
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raw_read_header,
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rawvideo_read_packet,
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raw_read_close,
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.extensions = "yuv",
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.value = CODEC_ID_RAWVIDEO,
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};
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AVOutputFormat rawvideo_oformat = {
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"rawvideo",
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"raw video format",
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NULL,
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"yuv",
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0,
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CODEC_ID_NONE,
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CODEC_ID_RAWVIDEO,
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raw_write_header,
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raw_write_packet,
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raw_write_trailer,
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};
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|
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static int null_write_packet(struct AVFormatContext *s,
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int stream_index,
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unsigned char *buf, int size, int force_pts)
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{
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return 0;
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}
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|
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AVOutputFormat null_oformat = {
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"null",
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"null video format",
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NULL,
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NULL,
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0,
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#ifdef WORDS_BIGENDIAN
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CODEC_ID_PCM_S16BE,
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#else
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CODEC_ID_PCM_S16LE,
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#endif
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CODEC_ID_RAWVIDEO,
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raw_write_header,
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null_write_packet,
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raw_write_trailer,
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.flags = AVFMT_NOFILE | AVFMT_RAWPICTURE,
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};
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|
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int raw_init(void)
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{
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av_register_input_format(&mp3_iformat);
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av_register_output_format(&mp2_oformat);
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av_register_input_format(&ac3_iformat);
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av_register_output_format(&ac3_oformat);
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av_register_output_format(&h263_oformat);
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av_register_input_format(&m4v_iformat);
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av_register_output_format(&m4v_oformat);
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av_register_input_format(&h264_iformat);
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av_register_output_format(&h264_oformat);
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av_register_input_format(&mpegvideo_iformat);
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av_register_output_format(&mpeg1video_oformat);
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av_register_input_format(&mjpeg_iformat);
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av_register_output_format(&mjpeg_oformat);
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av_register_input_format(&pcm_s16le_iformat);
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av_register_output_format(&pcm_s16le_oformat);
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av_register_input_format(&pcm_s16be_iformat);
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av_register_output_format(&pcm_s16be_oformat);
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av_register_input_format(&pcm_u16le_iformat);
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av_register_output_format(&pcm_u16le_oformat);
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av_register_input_format(&pcm_u16be_iformat);
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av_register_output_format(&pcm_u16be_oformat);
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av_register_input_format(&pcm_s8_iformat);
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av_register_output_format(&pcm_s8_oformat);
|
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av_register_input_format(&pcm_u8_iformat);
|
|
av_register_output_format(&pcm_u8_oformat);
|
|
av_register_input_format(&pcm_mulaw_iformat);
|
|
av_register_output_format(&pcm_mulaw_oformat);
|
|
av_register_input_format(&pcm_alaw_iformat);
|
|
av_register_output_format(&pcm_alaw_oformat);
|
|
|
|
av_register_input_format(&rawvideo_iformat);
|
|
av_register_output_format(&rawvideo_oformat);
|
|
|
|
av_register_output_format(&null_oformat);
|
|
return 0;
|
|
}
|