diff options
Diffstat (limited to 'ffmpeg/libavformat/rmenc.c')
| -rw-r--r-- | ffmpeg/libavformat/rmenc.c | 480 |
1 files changed, 480 insertions, 0 deletions
diff --git a/ffmpeg/libavformat/rmenc.c b/ffmpeg/libavformat/rmenc.c new file mode 100644 index 0000000..a96c429 --- /dev/null +++ b/ffmpeg/libavformat/rmenc.c @@ -0,0 +1,480 @@ +/* + * "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 { + int nb_packets; + int packet_total_size; + int packet_max_size; + /* codec related output */ + int bit_rate; + float frame_rate; + int nb_frames; /* current frame number */ + int total_frames; /* total number of frames */ + int num; + AVCodecContext *enc; +} StreamInfo; + +typedef struct { + 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 + + +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 = (int) (1000.0 * (float)stream->total_frames / stream->frame_rate); + 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, (int)(stream->total_frames * 1000 / stream->frame_rate)); + 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, (int) stream->frame_rate); /* frames per seconds ? */ + avio_wb32(s,0); /* unknown meaning */ + avio_wb16(s, (int) stream->frame_rate); /* 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 = (1000 * (float)stream->nb_frames) / stream->frame_rate; + 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++) { + 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 = (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 AVMEDIA_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; + } + } + + 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) +{ + uint8_t *buf1; + RMMuxContext *rm = s->priv_data; + AVIOContext *pb = s->pb; + StreamInfo *stream = rm->audio_stream; + int i; + + /* XXX: suppress this malloc */ + buf1 = av_malloc(size * sizeof(uint8_t)); + + 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) { + buf1[i] = buf[i+1]; + buf1[i+1] = buf[i]; + } + avio_write(pb, buf1, size); + } else { + avio_write(pb, buf, size); + } + avio_flush(pb); + stream->nb_frames++; + av_free(buf1); + 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 + 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); + avio_flush(pb); + + 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 }, +}; |