0,0 → 1,483 |
/* |
* "Real" compatible muxer. |
* Copyright (c) 2000, 2001 Fabrice Bellard |
* |
* This file is part of FFmpeg. |
* |
* FFmpeg is free software; you can redistribute it and/or |
* modify it under the terms of the GNU Lesser General Public |
* License as published by the Free Software Foundation; either |
* version 2.1 of the License, or (at your option) any later version. |
* |
* FFmpeg is distributed in the hope that it will be useful, |
* but WITHOUT ANY WARRANTY; without even the implied warranty of |
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
* Lesser General Public License for more details. |
* |
* You should have received a copy of the GNU Lesser General Public |
* License along with FFmpeg; if not, write to the Free Software |
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
*/ |
#include "avformat.h" |
#include "avio_internal.h" |
#include "rm.h" |
#include "libavutil/dict.h" |
|
typedef struct StreamInfo { |
int nb_packets; |
int packet_total_size; |
int packet_max_size; |
/* codec related output */ |
int bit_rate; |
AVRational frame_rate; |
int nb_frames; /* current frame number */ |
int total_frames; /* total number of frames */ |
int num; |
AVCodecContext *enc; |
} StreamInfo; |
|
typedef struct RMMuxContext { |
StreamInfo streams[2]; |
StreamInfo *audio_stream, *video_stream; |
int data_pos; /* position of the data after the header */ |
} RMMuxContext; |
|
/* in ms */ |
#define BUFFER_DURATION 0 |
/* the header needs at most 7 + 4 + 12 B */ |
#define MAX_HEADER_SIZE (7 + 4 + 12) |
/* UINT16_MAX is the maximal chunk size */ |
#define MAX_PACKET_SIZE (UINT16_MAX - MAX_HEADER_SIZE) |
|
|
static void put_str(AVIOContext *s, const char *tag) |
{ |
avio_wb16(s,strlen(tag)); |
while (*tag) { |
avio_w8(s, *tag++); |
} |
} |
|
static void put_str8(AVIOContext *s, const char *tag) |
{ |
avio_w8(s, strlen(tag)); |
while (*tag) { |
avio_w8(s, *tag++); |
} |
} |
|
static int rv10_write_header(AVFormatContext *ctx, |
int data_size, int index_pos) |
{ |
RMMuxContext *rm = ctx->priv_data; |
AVIOContext *s = ctx->pb; |
StreamInfo *stream; |
unsigned char *data_offset_ptr, *start_ptr; |
const char *desc, *mimetype; |
int nb_packets, packet_total_size, packet_max_size, size, packet_avg_size, i; |
int bit_rate, v, duration, flags, data_pos; |
AVDictionaryEntry *tag; |
|
start_ptr = s->buf_ptr; |
|
ffio_wfourcc(s, ".RMF"); |
avio_wb32(s,18); /* header size */ |
avio_wb16(s,0); |
avio_wb32(s,0); |
avio_wb32(s,4 + ctx->nb_streams); /* num headers */ |
|
ffio_wfourcc(s,"PROP"); |
avio_wb32(s, 50); |
avio_wb16(s, 0); |
packet_max_size = 0; |
packet_total_size = 0; |
nb_packets = 0; |
bit_rate = 0; |
duration = 0; |
for(i=0;i<ctx->nb_streams;i++) { |
StreamInfo *stream = &rm->streams[i]; |
bit_rate += stream->bit_rate; |
if (stream->packet_max_size > packet_max_size) |
packet_max_size = stream->packet_max_size; |
nb_packets += stream->nb_packets; |
packet_total_size += stream->packet_total_size; |
/* select maximum duration */ |
v = av_rescale_q_rnd(stream->total_frames, (AVRational){1000, 1}, stream->frame_rate, AV_ROUND_ZERO); |
if (v > duration) |
duration = v; |
} |
avio_wb32(s, bit_rate); /* max bit rate */ |
avio_wb32(s, bit_rate); /* avg bit rate */ |
avio_wb32(s, packet_max_size); /* max packet size */ |
if (nb_packets > 0) |
packet_avg_size = packet_total_size / nb_packets; |
else |
packet_avg_size = 0; |
avio_wb32(s, packet_avg_size); /* avg packet size */ |
avio_wb32(s, nb_packets); /* num packets */ |
avio_wb32(s, duration); /* duration */ |
avio_wb32(s, BUFFER_DURATION); /* preroll */ |
avio_wb32(s, index_pos); /* index offset */ |
/* computation of data the data offset */ |
data_offset_ptr = s->buf_ptr; |
avio_wb32(s, 0); /* data offset : will be patched after */ |
avio_wb16(s, ctx->nb_streams); /* num streams */ |
flags = 1 | 2; /* save allowed & perfect play */ |
if (!s->seekable) |
flags |= 4; /* live broadcast */ |
avio_wb16(s, flags); |
|
/* comments */ |
|
ffio_wfourcc(s,"CONT"); |
size = 4 * 2 + 10; |
for(i=0; i<FF_ARRAY_ELEMS(ff_rm_metadata); i++) { |
tag = av_dict_get(ctx->metadata, ff_rm_metadata[i], NULL, 0); |
if(tag) size += strlen(tag->value); |
} |
avio_wb32(s,size); |
avio_wb16(s,0); |
for(i=0; i<FF_ARRAY_ELEMS(ff_rm_metadata); i++) { |
tag = av_dict_get(ctx->metadata, ff_rm_metadata[i], NULL, 0); |
put_str(s, tag ? tag->value : ""); |
} |
|
for(i=0;i<ctx->nb_streams;i++) { |
int codec_data_size; |
|
stream = &rm->streams[i]; |
|
if (stream->enc->codec_type == AVMEDIA_TYPE_AUDIO) { |
desc = "The Audio Stream"; |
mimetype = "audio/x-pn-realaudio"; |
codec_data_size = 73; |
} else { |
desc = "The Video Stream"; |
mimetype = "video/x-pn-realvideo"; |
codec_data_size = 34; |
} |
|
ffio_wfourcc(s,"MDPR"); |
size = 10 + 9 * 4 + strlen(desc) + strlen(mimetype) + codec_data_size; |
avio_wb32(s, size); |
avio_wb16(s, 0); |
|
avio_wb16(s, i); /* stream number */ |
avio_wb32(s, stream->bit_rate); /* max bit rate */ |
avio_wb32(s, stream->bit_rate); /* avg bit rate */ |
avio_wb32(s, stream->packet_max_size); /* max packet size */ |
if (stream->nb_packets > 0) |
packet_avg_size = stream->packet_total_size / |
stream->nb_packets; |
else |
packet_avg_size = 0; |
avio_wb32(s, packet_avg_size); /* avg packet size */ |
avio_wb32(s, 0); /* start time */ |
avio_wb32(s, BUFFER_DURATION); /* preroll */ |
/* duration */ |
if (!s->seekable || !stream->total_frames) |
avio_wb32(s, (int)(3600 * 1000)); |
else |
avio_wb32(s, av_rescale_q_rnd(stream->total_frames, (AVRational){1000, 1}, stream->frame_rate, AV_ROUND_ZERO)); |
put_str8(s, desc); |
put_str8(s, mimetype); |
avio_wb32(s, codec_data_size); |
|
if (stream->enc->codec_type == AVMEDIA_TYPE_AUDIO) { |
int coded_frame_size, fscode, sample_rate; |
sample_rate = stream->enc->sample_rate; |
coded_frame_size = (stream->enc->bit_rate * |
stream->enc->frame_size) / (8 * sample_rate); |
/* audio codec info */ |
avio_write(s, ".ra", 3); |
avio_w8(s, 0xfd); |
avio_wb32(s, 0x00040000); /* version */ |
ffio_wfourcc(s, ".ra4"); |
avio_wb32(s, 0x01b53530); /* stream length */ |
avio_wb16(s, 4); /* unknown */ |
avio_wb32(s, 0x39); /* header size */ |
|
switch(sample_rate) { |
case 48000: |
case 24000: |
case 12000: |
fscode = 1; |
break; |
default: |
case 44100: |
case 22050: |
case 11025: |
fscode = 2; |
break; |
case 32000: |
case 16000: |
case 8000: |
fscode = 3; |
} |
avio_wb16(s, fscode); /* codec additional info, for AC-3, seems |
to be a frequency code */ |
/* special hack to compensate rounding errors... */ |
if (coded_frame_size == 557) |
coded_frame_size--; |
avio_wb32(s, coded_frame_size); /* frame length */ |
avio_wb32(s, 0x51540); /* unknown */ |
avio_wb32(s, stream->enc->bit_rate / 8 * 60); /* bytes per minute */ |
avio_wb32(s, stream->enc->bit_rate / 8 * 60); /* bytes per minute */ |
avio_wb16(s, 0x01); |
/* frame length : seems to be very important */ |
avio_wb16(s, coded_frame_size); |
avio_wb32(s, 0); /* unknown */ |
avio_wb16(s, stream->enc->sample_rate); /* sample rate */ |
avio_wb32(s, 0x10); /* unknown */ |
avio_wb16(s, stream->enc->channels); |
put_str8(s, "Int0"); /* codec name */ |
if (stream->enc->codec_tag) { |
avio_w8(s, 4); /* tag length */ |
avio_wl32(s, stream->enc->codec_tag); |
} else { |
av_log(ctx, AV_LOG_ERROR, "Invalid codec tag\n"); |
return -1; |
} |
avio_wb16(s, 0); /* title length */ |
avio_wb16(s, 0); /* author length */ |
avio_wb16(s, 0); /* copyright length */ |
avio_w8(s, 0); /* end of header */ |
} else { |
/* video codec info */ |
avio_wb32(s,34); /* size */ |
ffio_wfourcc(s, "VIDO"); |
if(stream->enc->codec_id == AV_CODEC_ID_RV10) |
ffio_wfourcc(s,"RV10"); |
else |
ffio_wfourcc(s,"RV20"); |
avio_wb16(s, stream->enc->width); |
avio_wb16(s, stream->enc->height); |
avio_wb16(s, stream->frame_rate.num / stream->frame_rate.den); /* frames per seconds ? */ |
avio_wb32(s,0); /* unknown meaning */ |
avio_wb16(s, stream->frame_rate.num / stream->frame_rate.den); /* unknown meaning */ |
avio_wb32(s,0); /* unknown meaning */ |
avio_wb16(s, 8); /* unknown meaning */ |
/* Seems to be the codec version: only use basic H263. The next |
versions seems to add a diffential DC coding as in |
MPEG... nothing new under the sun */ |
if(stream->enc->codec_id == AV_CODEC_ID_RV10) |
avio_wb32(s,0x10000000); |
else |
avio_wb32(s,0x20103001); |
//avio_wb32(s,0x10003000); |
} |
} |
|
/* patch data offset field */ |
data_pos = s->buf_ptr - start_ptr; |
rm->data_pos = data_pos; |
data_offset_ptr[0] = data_pos >> 24; |
data_offset_ptr[1] = data_pos >> 16; |
data_offset_ptr[2] = data_pos >> 8; |
data_offset_ptr[3] = data_pos; |
|
/* data stream */ |
ffio_wfourcc(s, "DATA"); |
avio_wb32(s,data_size + 10 + 8); |
avio_wb16(s,0); |
|
avio_wb32(s, nb_packets); /* number of packets */ |
avio_wb32(s,0); /* next data header */ |
return 0; |
} |
|
static void write_packet_header(AVFormatContext *ctx, StreamInfo *stream, |
int length, int key_frame) |
{ |
int timestamp; |
AVIOContext *s = ctx->pb; |
|
stream->nb_packets++; |
stream->packet_total_size += length; |
if (length > stream->packet_max_size) |
stream->packet_max_size = length; |
|
avio_wb16(s,0); /* version */ |
avio_wb16(s,length + 12); |
avio_wb16(s, stream->num); /* stream number */ |
timestamp = av_rescale_q_rnd(stream->nb_frames, (AVRational){1000, 1}, stream->frame_rate, AV_ROUND_ZERO); |
avio_wb32(s, timestamp); /* timestamp */ |
avio_w8(s, 0); /* reserved */ |
avio_w8(s, key_frame ? 2 : 0); /* flags */ |
} |
|
static int rm_write_header(AVFormatContext *s) |
{ |
RMMuxContext *rm = s->priv_data; |
StreamInfo *stream; |
int n; |
AVCodecContext *codec; |
|
if (s->nb_streams > 2) { |
av_log(s, AV_LOG_ERROR, "At most 2 streams are currently supported for muxing in RM\n"); |
return AVERROR_PATCHWELCOME; |
} |
|
for(n=0;n<s->nb_streams;n++) { |
AVStream *st = s->streams[n]; |
|
s->streams[n]->id = n; |
codec = s->streams[n]->codec; |
stream = &rm->streams[n]; |
memset(stream, 0, sizeof(StreamInfo)); |
stream->num = n; |
stream->bit_rate = codec->bit_rate; |
stream->enc = codec; |
|
switch(codec->codec_type) { |
case AVMEDIA_TYPE_AUDIO: |
rm->audio_stream = stream; |
stream->frame_rate = (AVRational){codec->sample_rate, codec->frame_size}; |
/* XXX: dummy values */ |
stream->packet_max_size = 1024; |
stream->nb_packets = 0; |
stream->total_frames = stream->nb_packets; |
break; |
case AVMEDIA_TYPE_VIDEO: |
rm->video_stream = stream; |
// TODO: should be avg_frame_rate |
stream->frame_rate = av_inv_q(st->time_base); |
/* XXX: dummy values */ |
stream->packet_max_size = 4096; |
stream->nb_packets = 0; |
stream->total_frames = stream->nb_packets; |
break; |
default: |
return -1; |
} |
} |
|
if (rv10_write_header(s, 0, 0)) |
return AVERROR_INVALIDDATA; |
avio_flush(s->pb); |
return 0; |
} |
|
static int rm_write_audio(AVFormatContext *s, const uint8_t *buf, int size, int flags) |
{ |
RMMuxContext *rm = s->priv_data; |
AVIOContext *pb = s->pb; |
StreamInfo *stream = rm->audio_stream; |
int i; |
|
write_packet_header(s, stream, size, !!(flags & AV_PKT_FLAG_KEY)); |
|
if (stream->enc->codec_id == AV_CODEC_ID_AC3) { |
/* for AC-3, the words seem to be reversed */ |
for (i = 0; i < size; i += 2) { |
avio_w8(pb, buf[i + 1]); |
avio_w8(pb, buf[i]); |
} |
} else { |
avio_write(pb, buf, size); |
} |
stream->nb_frames++; |
return 0; |
} |
|
static int rm_write_video(AVFormatContext *s, const uint8_t *buf, int size, int flags) |
{ |
RMMuxContext *rm = s->priv_data; |
AVIOContext *pb = s->pb; |
StreamInfo *stream = rm->video_stream; |
int key_frame = !!(flags & AV_PKT_FLAG_KEY); |
|
/* XXX: this is incorrect: should be a parameter */ |
|
/* Well, I spent some time finding the meaning of these bits. I am |
not sure I understood everything, but it works !! */ |
#if 1 |
if (size > MAX_PACKET_SIZE) { |
av_log(s, AV_LOG_ERROR, "Muxing packets larger than 64 kB (%d) is not supported\n", size); |
return AVERROR_PATCHWELCOME; |
} |
write_packet_header(s, stream, size + 7 + (size >= 0x4000)*4, key_frame); |
/* bit 7: '1' if final packet of a frame converted in several packets */ |
avio_w8(pb, 0x81); |
/* bit 7: '1' if I frame. bits 6..0 : sequence number in current |
frame starting from 1 */ |
if (key_frame) { |
avio_w8(pb, 0x81); |
} else { |
avio_w8(pb, 0x01); |
} |
if(size >= 0x4000){ |
avio_wb32(pb, size); /* total frame size */ |
avio_wb32(pb, size); /* offset from the start or the end */ |
}else{ |
avio_wb16(pb, 0x4000 | size); /* total frame size */ |
avio_wb16(pb, 0x4000 | size); /* offset from the start or the end */ |
} |
#else |
/* full frame */ |
write_packet_header(s, size + 6); |
avio_w8(pb, 0xc0); |
avio_wb16(pb, 0x4000 + size); /* total frame size */ |
avio_wb16(pb, 0x4000 + packet_number * 126); /* position in stream */ |
#endif |
avio_w8(pb, stream->nb_frames & 0xff); |
|
avio_write(pb, buf, size); |
|
stream->nb_frames++; |
return 0; |
} |
|
static int rm_write_packet(AVFormatContext *s, AVPacket *pkt) |
{ |
if (s->streams[pkt->stream_index]->codec->codec_type == |
AVMEDIA_TYPE_AUDIO) |
return rm_write_audio(s, pkt->data, pkt->size, pkt->flags); |
else |
return rm_write_video(s, pkt->data, pkt->size, pkt->flags); |
} |
|
static int rm_write_trailer(AVFormatContext *s) |
{ |
RMMuxContext *rm = s->priv_data; |
int data_size, index_pos, i; |
AVIOContext *pb = s->pb; |
|
if (s->pb->seekable) { |
/* end of file: finish to write header */ |
index_pos = avio_tell(pb); |
data_size = index_pos - rm->data_pos; |
|
/* FIXME: write index */ |
|
/* undocumented end header */ |
avio_wb32(pb, 0); |
avio_wb32(pb, 0); |
|
avio_seek(pb, 0, SEEK_SET); |
for(i=0;i<s->nb_streams;i++) |
rm->streams[i].total_frames = rm->streams[i].nb_frames; |
rv10_write_header(s, data_size, 0); |
} else { |
/* undocumented end header */ |
avio_wb32(pb, 0); |
avio_wb32(pb, 0); |
} |
|
return 0; |
} |
|
|
AVOutputFormat ff_rm_muxer = { |
.name = "rm", |
.long_name = NULL_IF_CONFIG_SMALL("RealMedia"), |
.mime_type = "application/vnd.rn-realmedia", |
.extensions = "rm,ra", |
.priv_data_size = sizeof(RMMuxContext), |
.audio_codec = AV_CODEC_ID_AC3, |
.video_codec = AV_CODEC_ID_RV10, |
.write_header = rm_write_header, |
.write_packet = rm_write_packet, |
.write_trailer = rm_write_trailer, |
.codec_tag = (const AVCodecTag* const []){ ff_rm_codec_tags, 0 }, |
}; |