mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-11-21 10:55:51 +02:00
7308439158
Since 596e5d4783, this is not necessary anymore. It also allows to
actually disable the flushing, improving write performance (but
possibly giving worse latency in real-time streaming).
Signed-off-by: Martin Storsjö <martin@martin.st>
479 lines
16 KiB
C
479 lines
16 KiB
C
/*
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* "Real" compatible muxer.
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* Copyright (c) 2000, 2001 Fabrice Bellard
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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 "avformat.h"
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#include "avio_internal.h"
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#include "rm.h"
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#include "libavutil/dict.h"
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typedef struct {
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int nb_packets;
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int packet_total_size;
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int packet_max_size;
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/* codec related output */
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int bit_rate;
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float frame_rate;
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int nb_frames; /* current frame number */
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int total_frames; /* total number of frames */
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int num;
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AVCodecContext *enc;
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} StreamInfo;
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typedef struct {
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StreamInfo streams[2];
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StreamInfo *audio_stream, *video_stream;
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int data_pos; /* position of the data after the header */
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} RMMuxContext;
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/* in ms */
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#define BUFFER_DURATION 0
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static void put_str(AVIOContext *s, const char *tag)
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{
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avio_wb16(s,strlen(tag));
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while (*tag) {
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avio_w8(s, *tag++);
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}
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}
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static void put_str8(AVIOContext *s, const char *tag)
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{
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avio_w8(s, strlen(tag));
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while (*tag) {
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avio_w8(s, *tag++);
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}
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}
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static int rv10_write_header(AVFormatContext *ctx,
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int data_size, int index_pos)
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{
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RMMuxContext *rm = ctx->priv_data;
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AVIOContext *s = ctx->pb;
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StreamInfo *stream;
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unsigned char *data_offset_ptr, *start_ptr;
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const char *desc, *mimetype;
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int nb_packets, packet_total_size, packet_max_size, size, packet_avg_size, i;
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int bit_rate, v, duration, flags, data_pos;
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AVDictionaryEntry *tag;
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start_ptr = s->buf_ptr;
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ffio_wfourcc(s, ".RMF");
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avio_wb32(s,18); /* header size */
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avio_wb16(s,0);
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avio_wb32(s,0);
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avio_wb32(s,4 + ctx->nb_streams); /* num headers */
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ffio_wfourcc(s,"PROP");
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avio_wb32(s, 50);
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avio_wb16(s, 0);
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packet_max_size = 0;
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packet_total_size = 0;
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nb_packets = 0;
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bit_rate = 0;
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duration = 0;
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for(i=0;i<ctx->nb_streams;i++) {
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StreamInfo *stream = &rm->streams[i];
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bit_rate += stream->bit_rate;
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if (stream->packet_max_size > packet_max_size)
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packet_max_size = stream->packet_max_size;
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nb_packets += stream->nb_packets;
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packet_total_size += stream->packet_total_size;
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/* select maximum duration */
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v = (int) (1000.0 * (float)stream->total_frames / stream->frame_rate);
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if (v > duration)
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duration = v;
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}
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avio_wb32(s, bit_rate); /* max bit rate */
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avio_wb32(s, bit_rate); /* avg bit rate */
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avio_wb32(s, packet_max_size); /* max packet size */
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if (nb_packets > 0)
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packet_avg_size = packet_total_size / nb_packets;
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else
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packet_avg_size = 0;
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avio_wb32(s, packet_avg_size); /* avg packet size */
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avio_wb32(s, nb_packets); /* num packets */
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avio_wb32(s, duration); /* duration */
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avio_wb32(s, BUFFER_DURATION); /* preroll */
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avio_wb32(s, index_pos); /* index offset */
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/* computation of data the data offset */
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data_offset_ptr = s->buf_ptr;
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avio_wb32(s, 0); /* data offset : will be patched after */
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avio_wb16(s, ctx->nb_streams); /* num streams */
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flags = 1 | 2; /* save allowed & perfect play */
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if (!s->seekable)
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flags |= 4; /* live broadcast */
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avio_wb16(s, flags);
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/* comments */
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ffio_wfourcc(s,"CONT");
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size = 4 * 2 + 10;
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for(i=0; i<FF_ARRAY_ELEMS(ff_rm_metadata); i++) {
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tag = av_dict_get(ctx->metadata, ff_rm_metadata[i], NULL, 0);
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if(tag) size += strlen(tag->value);
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}
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avio_wb32(s,size);
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avio_wb16(s,0);
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for(i=0; i<FF_ARRAY_ELEMS(ff_rm_metadata); i++) {
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tag = av_dict_get(ctx->metadata, ff_rm_metadata[i], NULL, 0);
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put_str(s, tag ? tag->value : "");
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}
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for(i=0;i<ctx->nb_streams;i++) {
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int codec_data_size;
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stream = &rm->streams[i];
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if (stream->enc->codec_type == AVMEDIA_TYPE_AUDIO) {
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desc = "The Audio Stream";
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mimetype = "audio/x-pn-realaudio";
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codec_data_size = 73;
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} else {
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desc = "The Video Stream";
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mimetype = "video/x-pn-realvideo";
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codec_data_size = 34;
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}
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ffio_wfourcc(s,"MDPR");
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size = 10 + 9 * 4 + strlen(desc) + strlen(mimetype) + codec_data_size;
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avio_wb32(s, size);
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avio_wb16(s, 0);
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avio_wb16(s, i); /* stream number */
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avio_wb32(s, stream->bit_rate); /* max bit rate */
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avio_wb32(s, stream->bit_rate); /* avg bit rate */
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avio_wb32(s, stream->packet_max_size); /* max packet size */
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if (stream->nb_packets > 0)
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packet_avg_size = stream->packet_total_size /
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stream->nb_packets;
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else
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packet_avg_size = 0;
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avio_wb32(s, packet_avg_size); /* avg packet size */
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avio_wb32(s, 0); /* start time */
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avio_wb32(s, BUFFER_DURATION); /* preroll */
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/* duration */
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if (!s->seekable || !stream->total_frames)
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avio_wb32(s, (int)(3600 * 1000));
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else
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avio_wb32(s, (int)(stream->total_frames * 1000 / stream->frame_rate));
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put_str8(s, desc);
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put_str8(s, mimetype);
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avio_wb32(s, codec_data_size);
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if (stream->enc->codec_type == AVMEDIA_TYPE_AUDIO) {
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int coded_frame_size, fscode, sample_rate;
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sample_rate = stream->enc->sample_rate;
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coded_frame_size = (stream->enc->bit_rate *
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stream->enc->frame_size) / (8 * sample_rate);
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/* audio codec info */
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avio_write(s, ".ra", 3);
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avio_w8(s, 0xfd);
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avio_wb32(s, 0x00040000); /* version */
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ffio_wfourcc(s, ".ra4");
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avio_wb32(s, 0x01b53530); /* stream length */
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avio_wb16(s, 4); /* unknown */
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avio_wb32(s, 0x39); /* header size */
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switch(sample_rate) {
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case 48000:
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case 24000:
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case 12000:
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fscode = 1;
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break;
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default:
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case 44100:
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case 22050:
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case 11025:
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fscode = 2;
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break;
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case 32000:
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case 16000:
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case 8000:
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fscode = 3;
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}
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avio_wb16(s, fscode); /* codec additional info, for AC-3, seems
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to be a frequency code */
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/* special hack to compensate rounding errors... */
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if (coded_frame_size == 557)
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coded_frame_size--;
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avio_wb32(s, coded_frame_size); /* frame length */
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avio_wb32(s, 0x51540); /* unknown */
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avio_wb32(s, stream->enc->bit_rate / 8 * 60); /* bytes per minute */
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avio_wb32(s, stream->enc->bit_rate / 8 * 60); /* bytes per minute */
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avio_wb16(s, 0x01);
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/* frame length : seems to be very important */
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avio_wb16(s, coded_frame_size);
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avio_wb32(s, 0); /* unknown */
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avio_wb16(s, stream->enc->sample_rate); /* sample rate */
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avio_wb32(s, 0x10); /* unknown */
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avio_wb16(s, stream->enc->channels);
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put_str8(s, "Int0"); /* codec name */
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if (stream->enc->codec_tag) {
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avio_w8(s, 4); /* tag length */
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avio_wl32(s, stream->enc->codec_tag);
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} else {
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av_log(ctx, AV_LOG_ERROR, "Invalid codec tag\n");
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return -1;
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}
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avio_wb16(s, 0); /* title length */
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avio_wb16(s, 0); /* author length */
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avio_wb16(s, 0); /* copyright length */
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avio_w8(s, 0); /* end of header */
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} else {
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/* video codec info */
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avio_wb32(s,34); /* size */
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ffio_wfourcc(s, "VIDO");
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if(stream->enc->codec_id == AV_CODEC_ID_RV10)
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ffio_wfourcc(s,"RV10");
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else
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ffio_wfourcc(s,"RV20");
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avio_wb16(s, stream->enc->width);
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avio_wb16(s, stream->enc->height);
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avio_wb16(s, (int) stream->frame_rate); /* frames per seconds ? */
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avio_wb32(s,0); /* unknown meaning */
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avio_wb16(s, (int) stream->frame_rate); /* unknown meaning */
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avio_wb32(s,0); /* unknown meaning */
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avio_wb16(s, 8); /* unknown meaning */
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/* Seems to be the codec version: only use basic H263. The next
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versions seems to add a diffential DC coding as in
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MPEG... nothing new under the sun */
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if(stream->enc->codec_id == AV_CODEC_ID_RV10)
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avio_wb32(s,0x10000000);
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else
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avio_wb32(s,0x20103001);
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//avio_wb32(s,0x10003000);
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}
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}
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/* patch data offset field */
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data_pos = s->buf_ptr - start_ptr;
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rm->data_pos = data_pos;
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data_offset_ptr[0] = data_pos >> 24;
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data_offset_ptr[1] = data_pos >> 16;
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data_offset_ptr[2] = data_pos >> 8;
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data_offset_ptr[3] = data_pos;
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/* data stream */
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ffio_wfourcc(s, "DATA");
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avio_wb32(s,data_size + 10 + 8);
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avio_wb16(s,0);
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avio_wb32(s, nb_packets); /* number of packets */
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avio_wb32(s,0); /* next data header */
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return 0;
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}
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static void write_packet_header(AVFormatContext *ctx, StreamInfo *stream,
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int length, int key_frame)
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{
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int timestamp;
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AVIOContext *s = ctx->pb;
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stream->nb_packets++;
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stream->packet_total_size += length;
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if (length > stream->packet_max_size)
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stream->packet_max_size = length;
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avio_wb16(s,0); /* version */
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avio_wb16(s,length + 12);
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avio_wb16(s, stream->num); /* stream number */
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timestamp = (1000 * (float)stream->nb_frames) / stream->frame_rate;
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avio_wb32(s, timestamp); /* timestamp */
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avio_w8(s, 0); /* reserved */
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avio_w8(s, key_frame ? 2 : 0); /* flags */
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}
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static int rm_write_header(AVFormatContext *s)
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{
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RMMuxContext *rm = s->priv_data;
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StreamInfo *stream;
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int n;
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AVCodecContext *codec;
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if (s->nb_streams > 2) {
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av_log(s, AV_LOG_ERROR, "At most 2 streams are currently supported for muxing in RM\n");
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return AVERROR_PATCHWELCOME;
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}
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for(n=0;n<s->nb_streams;n++) {
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s->streams[n]->id = n;
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codec = s->streams[n]->codec;
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stream = &rm->streams[n];
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memset(stream, 0, sizeof(StreamInfo));
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stream->num = n;
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stream->bit_rate = codec->bit_rate;
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stream->enc = codec;
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switch(codec->codec_type) {
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case AVMEDIA_TYPE_AUDIO:
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rm->audio_stream = stream;
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stream->frame_rate = (float)codec->sample_rate / (float)codec->frame_size;
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/* XXX: dummy values */
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stream->packet_max_size = 1024;
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stream->nb_packets = 0;
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stream->total_frames = stream->nb_packets;
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break;
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case AVMEDIA_TYPE_VIDEO:
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rm->video_stream = stream;
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stream->frame_rate = (float)codec->time_base.den / (float)codec->time_base.num;
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/* XXX: dummy values */
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stream->packet_max_size = 4096;
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stream->nb_packets = 0;
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stream->total_frames = stream->nb_packets;
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break;
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default:
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return -1;
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}
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}
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if (rv10_write_header(s, 0, 0))
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return AVERROR_INVALIDDATA;
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avio_flush(s->pb);
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return 0;
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}
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static int rm_write_audio(AVFormatContext *s, const uint8_t *buf, int size, int flags)
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{
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uint8_t *buf1;
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RMMuxContext *rm = s->priv_data;
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AVIOContext *pb = s->pb;
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StreamInfo *stream = rm->audio_stream;
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int i;
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/* XXX: suppress this malloc */
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buf1 = av_malloc(size * sizeof(uint8_t));
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write_packet_header(s, stream, size, !!(flags & AV_PKT_FLAG_KEY));
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if (stream->enc->codec_id == AV_CODEC_ID_AC3) {
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/* for AC-3, the words seem to be reversed */
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for(i=0;i<size;i+=2) {
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buf1[i] = buf[i+1];
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buf1[i+1] = buf[i];
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}
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avio_write(pb, buf1, size);
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} else {
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avio_write(pb, buf, size);
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}
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stream->nb_frames++;
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av_free(buf1);
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return 0;
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}
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static int rm_write_video(AVFormatContext *s, const uint8_t *buf, int size, int flags)
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{
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RMMuxContext *rm = s->priv_data;
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AVIOContext *pb = s->pb;
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StreamInfo *stream = rm->video_stream;
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int key_frame = !!(flags & AV_PKT_FLAG_KEY);
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/* XXX: this is incorrect: should be a parameter */
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/* Well, I spent some time finding the meaning of these bits. I am
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not sure I understood everything, but it works !! */
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#if 1
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write_packet_header(s, stream, size + 7 + (size >= 0x4000)*4, key_frame);
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/* bit 7: '1' if final packet of a frame converted in several packets */
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avio_w8(pb, 0x81);
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/* bit 7: '1' if I frame. bits 6..0 : sequence number in current
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frame starting from 1 */
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if (key_frame) {
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avio_w8(pb, 0x81);
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} else {
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avio_w8(pb, 0x01);
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}
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if(size >= 0x4000){
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avio_wb32(pb, size); /* total frame size */
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avio_wb32(pb, size); /* offset from the start or the end */
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}else{
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avio_wb16(pb, 0x4000 | size); /* total frame size */
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avio_wb16(pb, 0x4000 | size); /* offset from the start or the end */
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}
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#else
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/* full frame */
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write_packet_header(s, size + 6);
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avio_w8(pb, 0xc0);
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avio_wb16(pb, 0x4000 + size); /* total frame size */
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avio_wb16(pb, 0x4000 + packet_number * 126); /* position in stream */
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#endif
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avio_w8(pb, stream->nb_frames & 0xff);
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avio_write(pb, buf, size);
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stream->nb_frames++;
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return 0;
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}
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static int rm_write_packet(AVFormatContext *s, AVPacket *pkt)
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{
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if (s->streams[pkt->stream_index]->codec->codec_type ==
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AVMEDIA_TYPE_AUDIO)
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return rm_write_audio(s, pkt->data, pkt->size, pkt->flags);
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else
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return rm_write_video(s, pkt->data, pkt->size, pkt->flags);
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}
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static int rm_write_trailer(AVFormatContext *s)
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{
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RMMuxContext *rm = s->priv_data;
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int data_size, index_pos, i;
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AVIOContext *pb = s->pb;
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if (s->pb->seekable) {
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/* end of file: finish to write header */
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index_pos = avio_tell(pb);
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data_size = index_pos - rm->data_pos;
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/* FIXME: write index */
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/* undocumented end header */
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avio_wb32(pb, 0);
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avio_wb32(pb, 0);
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avio_seek(pb, 0, SEEK_SET);
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for(i=0;i<s->nb_streams;i++)
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rm->streams[i].total_frames = rm->streams[i].nb_frames;
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rv10_write_header(s, data_size, 0);
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} else {
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/* undocumented end header */
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avio_wb32(pb, 0);
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avio_wb32(pb, 0);
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}
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return 0;
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}
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AVOutputFormat ff_rm_muxer = {
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.name = "rm",
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.long_name = NULL_IF_CONFIG_SMALL("RealMedia"),
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.mime_type = "application/vnd.rn-realmedia",
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.extensions = "rm,ra",
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.priv_data_size = sizeof(RMMuxContext),
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.audio_codec = AV_CODEC_ID_AC3,
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.video_codec = AV_CODEC_ID_RV10,
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.write_header = rm_write_header,
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.write_packet = rm_write_packet,
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.write_trailer = rm_write_trailer,
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.codec_tag = (const AVCodecTag* const []){ ff_rm_codec_tags, 0 },
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};
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