diff options
Diffstat (limited to 'libavformat/ffmenc.c')
| -rw-r--r-- | libavformat/ffmenc.c | 374 |
1 files changed, 374 insertions, 0 deletions
diff --git a/libavformat/ffmenc.c b/libavformat/ffmenc.c new file mode 100644 index 0000000000..3abbfdd08f --- /dev/null +++ b/libavformat/ffmenc.c @@ -0,0 +1,374 @@ +/* + * 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, +}; 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