mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-02 03:06:28 +02:00
362 lines
9.7 KiB
C
362 lines
9.7 KiB
C
/*
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* AVI encoder.
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* Copyright (c) 2000 Gerard Lantau.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include "avformat.h"
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#include "avi.h"
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/*
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* TODO:
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* - fill all fields if non streamed (nb_frames for example)
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*/
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typedef struct AVIIndex {
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unsigned char tag[4];
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unsigned int flags, pos, len;
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struct AVIIndex *next;
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} AVIIndex;
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typedef struct {
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offset_t movi_list;
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AVIIndex *first, *last;
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} AVIContext;
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offset_t start_tag(ByteIOContext *pb, char *tag)
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{
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put_tag(pb, tag);
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put_le32(pb, 0);
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return url_ftell(pb);
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}
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void end_tag(ByteIOContext *pb, offset_t start)
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{
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offset_t pos;
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pos = url_ftell(pb);
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url_fseek(pb, start - 4, SEEK_SET);
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put_le32(pb, (UINT32)(pos - start));
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url_fseek(pb, pos, SEEK_SET);
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}
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/* Note: when encoding, the first matching tag is used, so order is
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important if multiple tags possible for a given codec. */
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CodecTag codec_bmp_tags[] = {
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{ CODEC_ID_H263, MKTAG('U', '2', '6', '3') },
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{ CODEC_ID_H263I, MKTAG('I', '2', '6', '3') }, /* intel h263 */
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{ CODEC_ID_MJPEG, MKTAG('M', 'J', 'P', 'G') },
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{ CODEC_ID_MPEG4, MKTAG('D', 'I', 'V', 'X') },
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{ CODEC_ID_MPEG4, MKTAG('d', 'i', 'v', 'x') },
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{ CODEC_ID_MPEG4, MKTAG(0x04, 0, 0, 0) }, /* some broken avi use this */
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{ CODEC_ID_MSMPEG4, MKTAG('D', 'I', 'V', '3') }, /* default signature when using MSMPEG4 */
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{ CODEC_ID_MSMPEG4, MKTAG('M', 'P', '4', '3') },
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{ 0, 0 },
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};
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CodecTag codec_wav_tags[] = {
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{ CODEC_ID_MP2, 0x55 },
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{ CODEC_ID_MP2, 0x50 },
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{ CODEC_ID_AC3, 0x2000 },
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{ CODEC_ID_PCM, 0x01 },
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{ 0, 0 },
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};
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unsigned int codec_get_tag(CodecTag *tags, int id)
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{
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while (tags->id != 0) {
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if (tags->id == id)
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return tags->tag;
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tags++;
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}
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return 0;
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}
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int codec_get_id(CodecTag *tags, unsigned int tag)
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{
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while (tags->id != 0) {
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if (tags->tag == tag)
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return tags->id;
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tags++;
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}
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return 0;
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}
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unsigned int codec_get_bmp_tag(int id)
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{
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return codec_get_tag(codec_bmp_tags, id);
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}
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/* BITMAPINFOHEADER header */
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void put_bmp_header(ByteIOContext *pb, AVCodecContext *enc)
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{
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put_le32(pb, 40); /* size */
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put_le32(pb, enc->width);
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put_le32(pb, enc->height);
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put_le16(pb, 1); /* planes */
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put_le16(pb, 24); /* depth */
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/* compression type */
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put_le32(pb, codec_get_bmp_tag(enc->codec_id));
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put_le32(pb, enc->width * enc->height * 3);
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put_le32(pb, 0);
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put_le32(pb, 0);
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put_le32(pb, 0);
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put_le32(pb, 0);
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}
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/* WAVEFORMATEX header */
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void put_wav_header(ByteIOContext *pb, AVCodecContext *enc)
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{
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int tag;
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tag = codec_get_tag(codec_wav_tags, enc->codec_id);
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put_le16(pb, tag);
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put_le16(pb, enc->channels);
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put_le32(pb, enc->sample_rate);
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put_le32(pb, enc->bit_rate / 8);
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put_le16(pb, 1); /* block align */
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put_le16(pb, 16); /* bits per sample */
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put_le16(pb, 0); /* wav_extra_size */
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}
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static int avi_write_header(AVFormatContext *s)
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{
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AVIContext *avi;
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ByteIOContext *pb = &s->pb;
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int bitrate, n, i, nb_frames;
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AVCodecContext *stream, *video_enc;
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offset_t list1, list2, strh, strf;
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avi = malloc(sizeof(AVIContext));
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if (!avi)
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return -1;
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memset(avi, 0, sizeof(AVIContext));
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s->priv_data = avi;
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put_tag(pb, "RIFF");
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put_le32(pb, 0); /* file length */
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put_tag(pb, "AVI ");
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/* header list */
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list1 = start_tag(pb, "LIST");
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put_tag(pb, "hdrl");
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/* avi header */
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put_tag(pb, "avih");
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put_le32(pb, 14 * 4);
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bitrate = 0;
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video_enc = NULL;
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for(n=0;n<s->nb_streams;n++) {
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stream = &s->streams[n]->codec;
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bitrate += stream->bit_rate;
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if (stream->codec_type == CODEC_TYPE_VIDEO)
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video_enc = stream;
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}
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if (!video_enc) {
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free(avi);
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return -1;
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}
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nb_frames = 0;
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put_le32(pb, (UINT32)(INT64_C(1000000) * FRAME_RATE_BASE / video_enc->frame_rate));
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put_le32(pb, bitrate / 8); /* XXX: not quite exact */
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put_le32(pb, 0); /* padding */
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put_le32(pb, AVIF_TRUSTCKTYPE | AVIF_HASINDEX | AVIF_ISINTERLEAVED); /* flags */
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put_le32(pb, nb_frames); /* nb frames, filled later */
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put_le32(pb, 0); /* initial frame */
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put_le32(pb, s->nb_streams); /* nb streams */
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put_le32(pb, 1024 * 1024); /* suggested buffer size */
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put_le32(pb, video_enc->width);
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put_le32(pb, video_enc->height);
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put_le32(pb, 0); /* reserved */
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put_le32(pb, 0); /* reserved */
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put_le32(pb, 0); /* reserved */
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put_le32(pb, 0); /* reserved */
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/* stream list */
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for(i=0;i<n;i++) {
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list2 = start_tag(pb, "LIST");
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put_tag(pb, "strl");
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stream = &s->streams[i]->codec;
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/* stream generic header */
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strh = start_tag(pb, "strh");
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switch(stream->codec_type) {
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case CODEC_TYPE_VIDEO:
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put_tag(pb, "vids");
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put_le32(pb, codec_get_bmp_tag(stream->codec_id));
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put_le32(pb, 0); /* flags */
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put_le16(pb, 0); /* priority */
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put_le16(pb, 0); /* language */
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put_le32(pb, 0); /* initial frame */
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put_le32(pb, 1000); /* scale */
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put_le32(pb, (1000 * stream->frame_rate) / FRAME_RATE_BASE); /* rate */
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put_le32(pb, 0); /* start */
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put_le32(pb, nb_frames); /* length, XXX: fill later */
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put_le32(pb, 1024 * 1024); /* suggested buffer size */
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put_le32(pb, 10000); /* quality */
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put_le32(pb, stream->width * stream->height * 3); /* sample size */
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put_le16(pb, 0);
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put_le16(pb, 0);
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put_le16(pb, stream->width);
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put_le16(pb, stream->height);
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break;
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case CODEC_TYPE_AUDIO:
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put_tag(pb, "auds");
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put_le32(pb, 0);
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put_le32(pb, 0); /* flags */
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put_le16(pb, 0); /* priority */
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put_le16(pb, 0); /* language */
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put_le32(pb, 0); /* initial frame */
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put_le32(pb, 1); /* scale */
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put_le32(pb, stream->bit_rate / 8); /* rate */
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put_le32(pb, 0); /* start */
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put_le32(pb, 0); /* length, XXX: filled later */
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put_le32(pb, 12 * 1024); /* suggested buffer size */
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put_le32(pb, -1); /* quality */
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put_le32(pb, 1); /* sample size */
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put_le32(pb, 0);
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put_le32(pb, 0);
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break;
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}
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end_tag(pb, strh);
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strf = start_tag(pb, "strf");
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switch(stream->codec_type) {
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case CODEC_TYPE_VIDEO:
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put_bmp_header(pb, stream);
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break;
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case CODEC_TYPE_AUDIO:
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put_wav_header(pb, stream);
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break;
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}
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end_tag(pb, strf);
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end_tag(pb, list2);
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}
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end_tag(pb, list1);
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avi->movi_list = start_tag(pb, "LIST");
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avi->first = NULL;
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avi->last = NULL;
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put_tag(pb, "movi");
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put_flush_packet(pb);
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return 0;
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}
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static int avi_write_packet(AVFormatContext *s, int stream_index,
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UINT8 *buf, int size)
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{
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AVIContext *avi = s->priv_data;
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ByteIOContext *pb = &s->pb;
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AVIIndex *idx;
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unsigned char tag[5];
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unsigned int flags;
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AVCodecContext *enc;
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enc = &s->streams[stream_index]->codec;
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tag[0] = '0';
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tag[1] = '0' + stream_index;
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if (enc->codec_type == CODEC_TYPE_VIDEO) {
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tag[2] = 'd';
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tag[3] = 'c';
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flags = enc->key_frame ? 0x10 : 0x00;
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} else {
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tag[2] = 'w';
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tag[3] = 'b';
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flags = 0x10;
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}
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if (!url_is_streamed(&s->pb)) {
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idx = malloc(sizeof(AVIIndex));
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memcpy(idx->tag, tag, 4);
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idx->flags = flags;
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idx->pos = url_ftell(pb) - avi->movi_list;
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idx->len = size;
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idx->next = NULL;
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if (!avi->last)
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avi->first = idx;
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else
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avi->last->next = idx;
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avi->last = idx;
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}
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put_buffer(pb, tag, 4);
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put_le32(pb, size);
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put_buffer(pb, buf, size);
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if (size & 1)
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put_byte(pb, 0);
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put_flush_packet(pb);
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return 0;
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}
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static int avi_write_trailer(AVFormatContext *s)
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{
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ByteIOContext *pb = &s->pb;
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AVIContext *avi = s->priv_data;
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offset_t file_size, idx_chunk;
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AVIIndex *idx;
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if (!url_is_streamed(&s->pb)) {
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end_tag(pb, avi->movi_list);
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idx_chunk = start_tag(pb, "idx1");
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idx = avi->first;
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while (idx != NULL) {
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put_buffer(pb, idx->tag, 4);
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put_le32(pb, idx->flags);
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put_le32(pb, idx->pos);
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put_le32(pb, idx->len);
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idx = idx->next;
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}
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end_tag(pb, idx_chunk);
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/* update file size */
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file_size = url_ftell(pb);
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url_fseek(pb, 4, SEEK_SET);
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put_le32(pb, (UINT32)(file_size - 8));
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url_fseek(pb, file_size, SEEK_SET);
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}
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put_flush_packet(pb);
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free(avi);
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return 0;
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}
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AVFormat avi_format = {
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"avi",
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"avi format",
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"video/x-msvideo",
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"avi",
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CODEC_ID_MP2,
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CODEC_ID_MSMPEG4,
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avi_write_header,
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avi_write_packet,
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avi_write_trailer,
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avi_read_header,
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avi_read_packet,
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avi_read_close,
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};
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