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author | Aurelien Jacobs <aurel@gnuage.org> | 2007-05-30 09:44:16 +0000 |
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committer | Aurelien Jacobs <aurel@gnuage.org> | 2007-05-30 09:44:16 +0000 |
commit | 7b2a2ce5561ca33006de84dae6c1263611bf1fd9 (patch) | |
tree | d0c98b2f2ffd014efa4e42a09018e95937cc95a6 /libavformat/rmenc.c | |
parent | 2db27aadcb6e7543321d5d68d06b2fdc4fd63491 (diff) | |
download | ffmpeg-7b2a2ce5561ca33006de84dae6c1263611bf1fd9.tar.gz |
split rm muxer and demuxer in their own files
Originally committed as revision 9156 to svn://svn.ffmpeg.org/ffmpeg/trunk
Diffstat (limited to 'libavformat/rmenc.c')
-rw-r--r-- | libavformat/rmenc.c | 439 |
1 files changed, 439 insertions, 0 deletions
diff --git a/libavformat/rmenc.c b/libavformat/rmenc.c new file mode 100644 index 0000000000..74f944317c --- /dev/null +++ b/libavformat/rmenc.c @@ -0,0 +1,439 @@ +/* + * "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 "rm.h" + +/* in ms */ +#define BUFFER_DURATION 0 + + +static void put_str(ByteIOContext *s, const char *tag) +{ + put_be16(s,strlen(tag)); + while (*tag) { + put_byte(s, *tag++); + } +} + +static void put_str8(ByteIOContext *s, const char *tag) +{ + put_byte(s, strlen(tag)); + while (*tag) { + put_byte(s, *tag++); + } +} + +static void rv10_write_header(AVFormatContext *ctx, + int data_size, int index_pos) +{ + RMContext *rm = ctx->priv_data; + ByteIOContext *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; + + start_ptr = s->buf_ptr; + + put_tag(s, ".RMF"); + put_be32(s,18); /* header size */ + put_be16(s,0); + put_be32(s,0); + put_be32(s,4 + ctx->nb_streams); /* num headers */ + + put_tag(s,"PROP"); + put_be32(s, 50); + put_be16(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 = (int) (1000.0 * (float)stream->total_frames / stream->frame_rate); + if (v > duration) + duration = v; + } + put_be32(s, bit_rate); /* max bit rate */ + put_be32(s, bit_rate); /* avg bit rate */ + put_be32(s, packet_max_size); /* max packet size */ + if (nb_packets > 0) + packet_avg_size = packet_total_size / nb_packets; + else + packet_avg_size = 0; + put_be32(s, packet_avg_size); /* avg packet size */ + put_be32(s, nb_packets); /* num packets */ + put_be32(s, duration); /* duration */ + put_be32(s, BUFFER_DURATION); /* preroll */ + put_be32(s, index_pos); /* index offset */ + /* computation of data the data offset */ + data_offset_ptr = s->buf_ptr; + put_be32(s, 0); /* data offset : will be patched after */ + put_be16(s, ctx->nb_streams); /* num streams */ + flags = 1 | 2; /* save allowed & perfect play */ + if (url_is_streamed(s)) + flags |= 4; /* live broadcast */ + put_be16(s, flags); + + /* comments */ + + put_tag(s,"CONT"); + size = strlen(ctx->title) + strlen(ctx->author) + strlen(ctx->copyright) + + strlen(ctx->comment) + 4 * 2 + 10; + put_be32(s,size); + put_be16(s,0); + put_str(s, ctx->title); + put_str(s, ctx->author); + put_str(s, ctx->copyright); + put_str(s, ctx->comment); + + for(i=0;i<ctx->nb_streams;i++) { + int codec_data_size; + + stream = &rm->streams[i]; + + if (stream->enc->codec_type == CODEC_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; + } + + put_tag(s,"MDPR"); + size = 10 + 9 * 4 + strlen(desc) + strlen(mimetype) + codec_data_size; + put_be32(s, size); + put_be16(s, 0); + + put_be16(s, i); /* stream number */ + put_be32(s, stream->bit_rate); /* max bit rate */ + put_be32(s, stream->bit_rate); /* avg bit rate */ + put_be32(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; + put_be32(s, packet_avg_size); /* avg packet size */ + put_be32(s, 0); /* start time */ + put_be32(s, BUFFER_DURATION); /* preroll */ + /* duration */ + if (url_is_streamed(s) || !stream->total_frames) + put_be32(s, (int)(3600 * 1000)); + else + put_be32(s, (int)(stream->total_frames * 1000 / stream->frame_rate)); + put_str8(s, desc); + put_str8(s, mimetype); + put_be32(s, codec_data_size); + + if (stream->enc->codec_type == CODEC_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 */ + put_tag(s, ".ra"); + put_byte(s, 0xfd); + put_be32(s, 0x00040000); /* version */ + put_tag(s, ".ra4"); + put_be32(s, 0x01b53530); /* stream length */ + put_be16(s, 4); /* unknown */ + put_be32(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; + } + put_be16(s, fscode); /* codec additional info, for AC3, seems + to be a frequency code */ + /* special hack to compensate rounding errors... */ + if (coded_frame_size == 557) + coded_frame_size--; + put_be32(s, coded_frame_size); /* frame length */ + put_be32(s, 0x51540); /* unknown */ + put_be32(s, 0x249f0); /* unknown */ + put_be32(s, 0x249f0); /* unknown */ + put_be16(s, 0x01); + /* frame length : seems to be very important */ + put_be16(s, coded_frame_size); + put_be32(s, 0); /* unknown */ + put_be16(s, stream->enc->sample_rate); /* sample rate */ + put_be32(s, 0x10); /* unknown */ + put_be16(s, stream->enc->channels); + put_str8(s, "Int0"); /* codec name */ + put_str8(s, "dnet"); /* codec name */ + put_be16(s, 0); /* title length */ + put_be16(s, 0); /* author length */ + put_be16(s, 0); /* copyright length */ + put_byte(s, 0); /* end of header */ + } else { + /* video codec info */ + put_be32(s,34); /* size */ + if(stream->enc->codec_id == CODEC_ID_RV10) + put_tag(s,"VIDORV10"); + else + put_tag(s,"VIDORV20"); + put_be16(s, stream->enc->width); + put_be16(s, stream->enc->height); + put_be16(s, (int) stream->frame_rate); /* frames per seconds ? */ + put_be32(s,0); /* unknown meaning */ + put_be16(s, (int) stream->frame_rate); /* unknown meaning */ + put_be32(s,0); /* unknown meaning */ + put_be16(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 == CODEC_ID_RV10) + put_be32(s,0x10000000); + else + put_be32(s,0x20103001); + //put_be32(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 */ + put_tag(s,"DATA"); + put_be32(s,data_size + 10 + 8); + put_be16(s,0); + + put_be32(s, nb_packets); /* number of packets */ + put_be32(s,0); /* next data header */ +} + +static void write_packet_header(AVFormatContext *ctx, StreamInfo *stream, + int length, int key_frame) +{ + int timestamp; + ByteIOContext *s = &ctx->pb; + + stream->nb_packets++; + stream->packet_total_size += length; + if (length > stream->packet_max_size) + stream->packet_max_size = length; + + put_be16(s,0); /* version */ + put_be16(s,length + 12); + put_be16(s, stream->num); /* stream number */ + timestamp = (1000 * (float)stream->nb_frames) / stream->frame_rate; + put_be32(s, timestamp); /* timestamp */ + put_byte(s, 0); /* reserved */ + put_byte(s, key_frame ? 2 : 0); /* flags */ +} + +static int rm_write_header(AVFormatContext *s) +{ + RMContext *rm = s->priv_data; + StreamInfo *stream; + int n; + AVCodecContext *codec; + + for(n=0;n<s->nb_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 CODEC_TYPE_AUDIO: + rm->audio_stream = stream; + stream->frame_rate = (float)codec->sample_rate / (float)codec->frame_size; + /* XXX: dummy values */ + stream->packet_max_size = 1024; + stream->nb_packets = 0; + stream->total_frames = stream->nb_packets; + break; + case CODEC_TYPE_VIDEO: + rm->video_stream = stream; + stream->frame_rate = (float)codec->time_base.den / (float)codec->time_base.num; + /* XXX: dummy values */ + stream->packet_max_size = 4096; + stream->nb_packets = 0; + stream->total_frames = stream->nb_packets; + break; + default: + return -1; + } + } + + rv10_write_header(s, 0, 0); + put_flush_packet(&s->pb); + return 0; +} + +static int rm_write_audio(AVFormatContext *s, const uint8_t *buf, int size, int flags) +{ + uint8_t *buf1; + RMContext *rm = s->priv_data; + ByteIOContext *pb = &s->pb; + StreamInfo *stream = rm->audio_stream; + int i; + + /* XXX: suppress this malloc */ + buf1= (uint8_t*) av_malloc( size * sizeof(uint8_t) ); + + write_packet_header(s, stream, size, !!(flags & PKT_FLAG_KEY)); + + /* for AC3, the words seems to be reversed */ + for(i=0;i<size;i+=2) { + buf1[i] = buf[i+1]; + buf1[i+1] = buf[i]; + } + put_buffer(pb, buf1, size); + put_flush_packet(pb); + stream->nb_frames++; + av_free(buf1); + return 0; +} + +static int rm_write_video(AVFormatContext *s, const uint8_t *buf, int size, int flags) +{ + RMContext *rm = s->priv_data; + ByteIOContext *pb = &s->pb; + StreamInfo *stream = rm->video_stream; + int key_frame = !!(flags & 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 + write_packet_header(s, stream, size + 7, key_frame); + /* bit 7: '1' if final packet of a frame converted in several packets */ + put_byte(pb, 0x81); + /* bit 7: '1' if I frame. bits 6..0 : sequence number in current + frame starting from 1 */ + if (key_frame) { + put_byte(pb, 0x81); + } else { + put_byte(pb, 0x01); + } + put_be16(pb, 0x4000 + (size)); /* total frame size */ + put_be16(pb, 0x4000 + (size)); /* offset from the start or the end */ +#else + /* full frame */ + write_packet_header(s, size + 6); + put_byte(pb, 0xc0); + put_be16(pb, 0x4000 + size); /* total frame size */ + put_be16(pb, 0x4000 + packet_number * 126); /* position in stream */ +#endif + put_byte(pb, stream->nb_frames & 0xff); + + put_buffer(pb, buf, size); + put_flush_packet(pb); + + stream->nb_frames++; + return 0; +} + +static int rm_write_packet(AVFormatContext *s, AVPacket *pkt) +{ + if (s->streams[pkt->stream_index]->codec->codec_type == + CODEC_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) +{ + RMContext *rm = s->priv_data; + int data_size, index_pos, i; + ByteIOContext *pb = &s->pb; + + if (!url_is_streamed(&s->pb)) { + /* end of file: finish to write header */ + index_pos = url_fseek(pb, 0, SEEK_CUR); + data_size = index_pos - rm->data_pos; + + /* index */ + put_tag(pb, "INDX"); + put_be32(pb, 10 + 10 * s->nb_streams); + put_be16(pb, 0); + + for(i=0;i<s->nb_streams;i++) { + put_be32(pb, 0); /* zero indices */ + put_be16(pb, i); /* stream number */ + put_be32(pb, 0); /* next index */ + } + /* undocumented end header */ + put_be32(pb, 0); + put_be32(pb, 0); + + url_fseek(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, index_pos); + } else { + /* undocumented end header */ + put_be32(pb, 0); + put_be32(pb, 0); + } + put_flush_packet(pb); + return 0; +} + + +AVOutputFormat rm_muxer = { + "rm", + "rm format", + "application/vnd.rn-realmedia", + "rm,ra", + sizeof(RMContext), + CODEC_ID_AC3, + CODEC_ID_RV10, + rm_write_header, + rm_write_packet, + rm_write_trailer, +}; |