| /* |
| * FFM (ffserver live feed) muxer |
| * Copyright (c) 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 "libavutil/intreadwrite.h" |
| #include "libavutil/intfloat.h" |
| #include "libavutil/avassert.h" |
| #include "libavutil/parseutils.h" |
| #include "libavutil/opt.h" |
| #include "avformat.h" |
| #include "avio_internal.h" |
| #include "internal.h" |
| #include "ffm.h" |
| |
| static void flush_packet(AVFormatContext *s) |
| { |
| FFMContext *ffm = s->priv_data; |
| int fill_size, h; |
| AVIOContext *pb = s->pb; |
| |
| fill_size = ffm->packet_end - ffm->packet_ptr; |
| memset(ffm->packet_ptr, 0, fill_size); |
| |
| av_assert1(avio_tell(pb) % ffm->packet_size == 0); |
| |
| /* put header */ |
| avio_wb16(pb, PACKET_ID); |
| avio_wb16(pb, fill_size); |
| avio_wb64(pb, ffm->dts); |
| h = ffm->frame_offset; |
| if (ffm->first_packet) |
| h |= 0x8000; |
| avio_wb16(pb, h); |
| avio_write(pb, ffm->packet, ffm->packet_end - ffm->packet); |
| avio_flush(pb); |
| |
| /* prepare next packet */ |
| ffm->frame_offset = 0; /* no key frame */ |
| ffm->packet_ptr = ffm->packet; |
| ffm->first_packet = 0; |
| } |
| |
| /* 'first' is true if first data of a frame */ |
| static void ffm_write_data(AVFormatContext *s, |
| const uint8_t *buf, int size, |
| int64_t dts, int header) |
| { |
| FFMContext *ffm = s->priv_data; |
| int len; |
| |
| if (header && ffm->frame_offset == 0) { |
| ffm->frame_offset = ffm->packet_ptr - ffm->packet + FFM_HEADER_SIZE; |
| ffm->dts = dts; |
| } |
| |
| /* write as many packets as needed */ |
| while (size > 0) { |
| len = ffm->packet_end - ffm->packet_ptr; |
| if (len > size) |
| len = size; |
| memcpy(ffm->packet_ptr, buf, len); |
| |
| ffm->packet_ptr += len; |
| buf += len; |
| size -= len; |
| if (ffm->packet_ptr >= ffm->packet_end) |
| flush_packet(s); |
| } |
| } |
| |
| static void write_header_chunk(AVIOContext *pb, AVIOContext *dpb, unsigned id) |
| { |
| uint8_t *dyn_buf; |
| int dyn_size= avio_close_dyn_buf(dpb, &dyn_buf); |
| avio_wb32(pb, id); |
| avio_wb32(pb, dyn_size); |
| avio_write(pb, dyn_buf, dyn_size); |
| av_free(dyn_buf); |
| } |
| |
| static int ffm_write_header_codec_private_ctx(AVFormatContext *s, AVCodecContext *ctx, int type) |
| { |
| AVIOContext *pb = s->pb; |
| AVIOContext *tmp; |
| char *buf = NULL; |
| int ret; |
| const AVCodec *enc = ctx->codec ? ctx->codec : avcodec_find_encoder(ctx->codec_id); |
| |
| if (!enc) { |
| av_log(s, AV_LOG_WARNING, "Stream codec is not found. Codec private options are not stored.\n"); |
| return 0; |
| } |
| if (ctx->priv_data && enc->priv_class && enc->priv_data_size) { |
| if ((ret = av_opt_serialize(ctx->priv_data, AV_OPT_FLAG_ENCODING_PARAM | type, |
| AV_OPT_SERIALIZE_SKIP_DEFAULTS, &buf, '=', ',')) < 0) |
| return ret; |
| if (buf && strlen(buf)) { |
| if (avio_open_dyn_buf(&tmp) < 0) { |
| av_free(buf); |
| return AVERROR(ENOMEM); |
| } |
| avio_put_str(tmp, buf); |
| write_header_chunk(pb, tmp, MKBETAG('C', 'P', 'R', 'V')); |
| } |
| av_free(buf); |
| } |
| return 0; |
| } |
| |
| static int ffm_write_header_codec_ctx(AVIOContext *pb, AVCodecContext *ctx, unsigned tag, int type) |
| { |
| AVIOContext *tmp; |
| char *buf = NULL; |
| int ret, need_coma = 0; |
| |
| #define SKIP_DEFAULTS AV_OPT_SERIALIZE_SKIP_DEFAULTS |
| #define OPT_FLAGS_EXACT AV_OPT_SERIALIZE_OPT_FLAGS_EXACT |
| #define ENC AV_OPT_FLAG_ENCODING_PARAM |
| |
| if (avio_open_dyn_buf(&tmp) < 0) |
| return AVERROR(ENOMEM); |
| if ((ret = av_opt_serialize(ctx, ENC | type, SKIP_DEFAULTS, &buf, '=', ',')) < 0) |
| goto fail; |
| if (buf && strlen(buf)) { |
| avio_write(tmp, buf, strlen(buf)); |
| av_freep(&buf); |
| need_coma = 1; |
| } |
| if ((ret = av_opt_serialize(ctx, 0, SKIP_DEFAULTS | OPT_FLAGS_EXACT, &buf, '=', ',')) < 0) |
| goto fail; |
| if (buf && strlen(buf)) { |
| if (need_coma) |
| avio_w8(tmp, ','); |
| avio_write(tmp, buf, strlen(buf)); |
| } |
| av_freep(&buf); |
| avio_w8(tmp, 0); |
| write_header_chunk(pb, tmp, tag); |
| return 0; |
| fail: |
| av_free(buf); |
| ffio_free_dyn_buf(&tmp); |
| return ret; |
| |
| #undef SKIP_DEFAULTS |
| #undef OPT_FLAGS_EXACT |
| #undef ENC |
| } |
| |
| static int ffm_write_recommended_config(AVIOContext *pb, AVCodecContext *ctx, unsigned tag, |
| const char *configuration) |
| { |
| int ret; |
| const AVCodec *enc = ctx->codec ? ctx->codec : avcodec_find_encoder(ctx->codec_id); |
| AVIOContext *tmp; |
| AVDictionaryEntry *t = NULL; |
| AVDictionary *all = NULL, *comm = NULL, *prv = NULL; |
| char *buf = NULL; |
| |
| if (!enc || !enc->priv_class || !enc->priv_data_size) { |
| /* codec is not known/has no private options, so save everything as common options */ |
| if (avio_open_dyn_buf(&tmp) < 0) |
| return AVERROR(ENOMEM); |
| avio_put_str(tmp, configuration); |
| write_header_chunk(pb, tmp, tag); |
| return 0; |
| } |
| |
| if ((ret = av_dict_parse_string(&all, configuration, "=", ",", 0)) < 0) |
| return ret; |
| |
| while ((t = av_dict_get(all, "", t, AV_DICT_IGNORE_SUFFIX))) { |
| if (av_opt_find((void *)&enc->priv_class, t->key, NULL, 0, AV_OPT_SEARCH_FAKE_OBJ)) { |
| if ((ret = av_dict_set(&prv, t->key, t->value, 0)) < 0) |
| goto fail; |
| } else if ((ret = av_dict_set(&comm, t->key, t->value, 0)) < 0) |
| goto fail; |
| } |
| |
| if (comm) { |
| if ((ret = av_dict_get_string(comm, &buf, '=', ',')) < 0 || |
| (ret = avio_open_dyn_buf(&tmp)) < 0) |
| goto fail; |
| avio_put_str(tmp, buf); |
| av_freep(&buf); |
| write_header_chunk(pb, tmp, tag); |
| } |
| if (prv) { |
| if ((ret = av_dict_get_string(prv, &buf, '=', ',')) < 0 || |
| (ret = avio_open_dyn_buf(&tmp)) < 0) |
| goto fail; |
| avio_put_str(tmp, buf); |
| write_header_chunk(pb, tmp, MKBETAG('C', 'P', 'R', 'V')); |
| } |
| |
| fail: |
| av_free(buf); |
| av_dict_free(&all); |
| av_dict_free(&comm); |
| av_dict_free(&prv); |
| return ret; |
| } |
| |
| static int ffm_write_header(AVFormatContext *s) |
| { |
| FFMContext *ffm = s->priv_data; |
| AVDictionaryEntry *t; |
| AVStream *st; |
| AVIOContext *pb = s->pb; |
| AVCodecContext *codec; |
| int bit_rate, i, ret; |
| |
| if (t = av_dict_get(s->metadata, "creation_time", NULL, 0)) { |
| ret = av_parse_time(&ffm->start_time, t->value, 0); |
| if (ret < 0) |
| return ret; |
| } |
| |
| ffm->packet_size = FFM_PACKET_SIZE; |
| |
| /* header */ |
| avio_wl32(pb, MKTAG('F', 'F', 'M', '2')); |
| avio_wb32(pb, ffm->packet_size); |
| avio_wb64(pb, 0); /* current write position */ |
| |
| if(avio_open_dyn_buf(&pb) < 0) |
| return AVERROR(ENOMEM); |
| |
| avio_wb32(pb, s->nb_streams); |
| bit_rate = 0; |
| for(i=0;i<s->nb_streams;i++) { |
| st = s->streams[i]; |
| bit_rate += st->codec->bit_rate; |
| } |
| avio_wb32(pb, bit_rate); |
| |
| write_header_chunk(s->pb, pb, MKBETAG('M', 'A', 'I', 'N')); |
| |
| /* list of streams */ |
| for(i=0;i<s->nb_streams;i++) { |
| st = s->streams[i]; |
| avpriv_set_pts_info(st, 64, 1, 1000000); |
| if(avio_open_dyn_buf(&pb) < 0) |
| return AVERROR(ENOMEM); |
| |
| codec = st->codec; |
| /* generic info */ |
| avio_wb32(pb, codec->codec_id); |
| avio_w8(pb, codec->codec_type); |
| avio_wb32(pb, codec->bit_rate); |
| avio_wb32(pb, codec->flags); |
| avio_wb32(pb, codec->flags2); |
| avio_wb32(pb, codec->debug); |
| if (codec->flags & CODEC_FLAG_GLOBAL_HEADER) { |
| avio_wb32(pb, codec->extradata_size); |
| avio_write(pb, codec->extradata, codec->extradata_size); |
| } |
| write_header_chunk(s->pb, pb, MKBETAG('C', 'O', 'M', 'M')); |
| /* specific info */ |
| switch(codec->codec_type) { |
| case AVMEDIA_TYPE_VIDEO: |
| if (st->recommended_encoder_configuration) { |
| av_log(NULL, AV_LOG_DEBUG, "writing recommended configuration: %s\n", |
| st->recommended_encoder_configuration); |
| if ((ret = ffm_write_recommended_config(s->pb, codec, MKBETAG('S', '2', 'V', 'I'), |
| st->recommended_encoder_configuration)) < 0) |
| return ret; |
| } else if ((ret = ffm_write_header_codec_ctx(s->pb, codec, MKBETAG('S', '2', 'V', 'I'), AV_OPT_FLAG_VIDEO_PARAM)) < 0 || |
| (ret = ffm_write_header_codec_private_ctx(s, codec, AV_OPT_FLAG_VIDEO_PARAM)) < 0) |
| return ret; |
| break; |
| case AVMEDIA_TYPE_AUDIO: |
| if (st->recommended_encoder_configuration) { |
| av_log(NULL, AV_LOG_DEBUG, "writing recommended configuration: %s\n", |
| st->recommended_encoder_configuration); |
| if ((ret = ffm_write_recommended_config(s->pb, codec, MKBETAG('S', '2', 'A', 'U'), |
| st->recommended_encoder_configuration)) < 0) |
| return ret; |
| } else if ((ret = ffm_write_header_codec_ctx(s->pb, codec, MKBETAG('S', '2', 'A', 'U'), AV_OPT_FLAG_AUDIO_PARAM)) < 0 || |
| (ret = ffm_write_header_codec_private_ctx(s, codec, AV_OPT_FLAG_AUDIO_PARAM)) < 0) |
| return ret; |
| break; |
| default: |
| return -1; |
| } |
| } |
| pb = s->pb; |
| |
| avio_wb64(pb, 0); // end of header |
| |
| /* flush until end of block reached */ |
| while ((avio_tell(pb) % ffm->packet_size) != 0) |
| avio_w8(pb, 0); |
| |
| avio_flush(pb); |
| |
| /* init packet mux */ |
| ffm->packet_ptr = ffm->packet; |
| ffm->packet_end = ffm->packet + ffm->packet_size - FFM_HEADER_SIZE; |
| av_assert0(ffm->packet_end >= ffm->packet); |
| ffm->frame_offset = 0; |
| ffm->dts = 0; |
| ffm->first_packet = 1; |
| |
| return 0; |
| } |
| |
| static int ffm_write_packet(AVFormatContext *s, AVPacket *pkt) |
| { |
| FFMContext *ffm = s->priv_data; |
| int64_t dts; |
| uint8_t header[FRAME_HEADER_SIZE+4]; |
| int header_size = FRAME_HEADER_SIZE; |
| |
| dts = ffm->start_time + pkt->dts; |
| /* packet size & key_frame */ |
| header[0] = pkt->stream_index; |
| header[1] = 0; |
| if (pkt->flags & AV_PKT_FLAG_KEY) |
| header[1] |= FLAG_KEY_FRAME; |
| AV_WB24(header+2, pkt->size); |
| AV_WB24(header+5, pkt->duration); |
| AV_WB64(header+8, ffm->start_time + pkt->pts); |
| if (pkt->pts != pkt->dts) { |
| header[1] |= FLAG_DTS; |
| AV_WB32(header+16, pkt->pts - pkt->dts); |
| header_size += 4; |
| } |
| ffm_write_data(s, header, header_size, dts, 1); |
| ffm_write_data(s, pkt->data, pkt->size, dts, 0); |
| |
| return 0; |
| } |
| |
| static int ffm_write_trailer(AVFormatContext *s) |
| { |
| FFMContext *ffm = s->priv_data; |
| |
| /* flush packets */ |
| if (ffm->packet_ptr > ffm->packet) |
| flush_packet(s); |
| |
| return 0; |
| } |
| |
| AVOutputFormat ff_ffm_muxer = { |
| .name = "ffm", |
| .long_name = NULL_IF_CONFIG_SMALL("FFM (FFserver live feed)"), |
| .extensions = "ffm", |
| .priv_data_size = sizeof(FFMContext), |
| .audio_codec = AV_CODEC_ID_MP2, |
| .video_codec = AV_CODEC_ID_MPEG1VIDEO, |
| .write_header = ffm_write_header, |
| .write_packet = ffm_write_packet, |
| .write_trailer = ffm_write_trailer, |
| .flags = AVFMT_TS_NEGATIVE, |
| }; |