| /* |
| * FFM (ffserver live feed) demuxer |
| * 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 "avformat.h" |
| #include "ffm.h" |
| #if CONFIG_FFSERVER |
| #include <unistd.h> |
| |
| int64_t ffm_read_write_index(int fd) |
| { |
| uint8_t buf[8]; |
| |
| lseek(fd, 8, SEEK_SET); |
| if (read(fd, buf, 8) != 8) |
| return AVERROR(EIO); |
| return AV_RB64(buf); |
| } |
| |
| int ffm_write_write_index(int fd, int64_t pos) |
| { |
| uint8_t buf[8]; |
| int i; |
| |
| for(i=0;i<8;i++) |
| buf[i] = (pos >> (56 - i * 8)) & 0xff; |
| lseek(fd, 8, SEEK_SET); |
| if (write(fd, buf, 8) != 8) |
| return AVERROR(EIO); |
| return 8; |
| } |
| |
| void ffm_set_write_index(AVFormatContext *s, int64_t pos, int64_t file_size) |
| { |
| FFMContext *ffm = s->priv_data; |
| ffm->write_index = pos; |
| ffm->file_size = file_size; |
| } |
| #endif // CONFIG_FFSERVER |
| |
| static int ffm_is_avail_data(AVFormatContext *s, int size) |
| { |
| FFMContext *ffm = s->priv_data; |
| int64_t pos, avail_size; |
| int len; |
| |
| len = ffm->packet_end - ffm->packet_ptr; |
| if (size <= len) |
| return 1; |
| pos = url_ftell(s->pb); |
| if (pos == ffm->write_index) { |
| /* exactly at the end of stream */ |
| return 0; |
| } else if (pos < ffm->write_index) { |
| avail_size = ffm->write_index - pos; |
| } else { |
| avail_size = (ffm->file_size - pos) + (ffm->write_index - FFM_PACKET_SIZE); |
| } |
| avail_size = (avail_size / ffm->packet_size) * (ffm->packet_size - FFM_HEADER_SIZE) + len; |
| if (size <= avail_size) |
| return 1; |
| else |
| return 0; |
| } |
| |
| /* first is true if we read the frame header */ |
| static int ffm_read_data(AVFormatContext *s, |
| uint8_t *buf, int size, int header) |
| { |
| FFMContext *ffm = s->priv_data; |
| ByteIOContext *pb = s->pb; |
| int len, fill_size, size1, frame_offset; |
| |
| size1 = size; |
| while (size > 0) { |
| redo: |
| len = ffm->packet_end - ffm->packet_ptr; |
| if (len < 0) |
| return -1; |
| if (len > size) |
| len = size; |
| if (len == 0) { |
| if (url_ftell(pb) == ffm->file_size) |
| url_fseek(pb, ffm->packet_size, SEEK_SET); |
| retry_read: |
| get_be16(pb); /* PACKET_ID */ |
| fill_size = get_be16(pb); |
| ffm->dts = get_be64(pb); |
| frame_offset = get_be16(pb); |
| get_buffer(pb, ffm->packet, ffm->packet_size - FFM_HEADER_SIZE); |
| ffm->packet_end = ffm->packet + (ffm->packet_size - FFM_HEADER_SIZE - fill_size); |
| if (ffm->packet_end < ffm->packet || frame_offset < 0) |
| return -1; |
| /* if first packet or resynchronization packet, we must |
| handle it specifically */ |
| if (ffm->first_packet || (frame_offset & 0x8000)) { |
| if (!frame_offset) { |
| /* This packet has no frame headers in it */ |
| if (url_ftell(pb) >= ffm->packet_size * 3) { |
| url_fseek(pb, -ffm->packet_size * 2, SEEK_CUR); |
| goto retry_read; |
| } |
| /* This is bad, we cannot find a valid frame header */ |
| return 0; |
| } |
| ffm->first_packet = 0; |
| if ((frame_offset & 0x7fff) < FFM_HEADER_SIZE) |
| return -1; |
| ffm->packet_ptr = ffm->packet + (frame_offset & 0x7fff) - FFM_HEADER_SIZE; |
| if (!header) |
| break; |
| } else { |
| ffm->packet_ptr = ffm->packet; |
| } |
| goto redo; |
| } |
| memcpy(buf, ffm->packet_ptr, len); |
| buf += len; |
| ffm->packet_ptr += len; |
| size -= len; |
| header = 0; |
| } |
| return size1 - size; |
| } |
| |
| //#define DEBUG_SEEK |
| |
| /* pos is between 0 and file_size - FFM_PACKET_SIZE. It is translated |
| by the write position inside this function */ |
| static void ffm_seek1(AVFormatContext *s, int64_t pos1) |
| { |
| FFMContext *ffm = s->priv_data; |
| ByteIOContext *pb = s->pb; |
| int64_t pos; |
| |
| pos = pos1 + ffm->write_index; |
| if (pos >= ffm->file_size) |
| pos -= (ffm->file_size - FFM_PACKET_SIZE); |
| #ifdef DEBUG_SEEK |
| av_log(s, AV_LOG_DEBUG, "seek to %"PRIx64" -> %"PRIx64"\n", pos1, pos); |
| #endif |
| url_fseek(pb, pos, SEEK_SET); |
| } |
| |
| static int64_t get_dts(AVFormatContext *s, int64_t pos) |
| { |
| ByteIOContext *pb = s->pb; |
| int64_t dts; |
| |
| ffm_seek1(s, pos); |
| url_fskip(pb, 4); |
| dts = get_be64(pb); |
| #ifdef DEBUG_SEEK |
| av_log(s, AV_LOG_DEBUG, "pts=%0.6f\n", pts / 1000000.0); |
| #endif |
| return dts; |
| } |
| |
| static void adjust_write_index(AVFormatContext *s) |
| { |
| FFMContext *ffm = s->priv_data; |
| ByteIOContext *pb = s->pb; |
| int64_t pts; |
| //int64_t orig_write_index = ffm->write_index; |
| int64_t pos_min, pos_max; |
| int64_t pts_start; |
| int64_t ptr = url_ftell(pb); |
| |
| |
| pos_min = 0; |
| pos_max = ffm->file_size - 2 * FFM_PACKET_SIZE; |
| |
| pts_start = get_dts(s, pos_min); |
| |
| pts = get_dts(s, pos_max); |
| |
| if (pts - 100000 > pts_start) |
| goto end; |
| |
| ffm->write_index = FFM_PACKET_SIZE; |
| |
| pts_start = get_dts(s, pos_min); |
| |
| pts = get_dts(s, pos_max); |
| |
| if (pts - 100000 <= pts_start) { |
| while (1) { |
| int64_t newpos; |
| int64_t newpts; |
| |
| newpos = ((pos_max + pos_min) / (2 * FFM_PACKET_SIZE)) * FFM_PACKET_SIZE; |
| |
| if (newpos == pos_min) |
| break; |
| |
| newpts = get_dts(s, newpos); |
| |
| if (newpts - 100000 <= pts) { |
| pos_max = newpos; |
| pts = newpts; |
| } else { |
| pos_min = newpos; |
| } |
| } |
| ffm->write_index += pos_max; |
| } |
| |
| //printf("Adjusted write index from %"PRId64" to %"PRId64": pts=%0.6f\n", orig_write_index, ffm->write_index, pts / 1000000.); |
| //printf("pts range %0.6f - %0.6f\n", get_dts(s, 0) / 1000000. , get_dts(s, ffm->file_size - 2 * FFM_PACKET_SIZE) / 1000000. ); |
| |
| end: |
| url_fseek(pb, ptr, SEEK_SET); |
| } |
| |
| |
| static int ffm_read_header(AVFormatContext *s, AVFormatParameters *ap) |
| { |
| FFMContext *ffm = s->priv_data; |
| AVStream *st; |
| ByteIOContext *pb = s->pb; |
| AVCodecContext *codec; |
| int i, nb_streams; |
| uint32_t tag; |
| |
| /* header */ |
| tag = get_le32(pb); |
| if (tag != MKTAG('F', 'F', 'M', '1')) |
| goto fail; |
| ffm->packet_size = get_be32(pb); |
| if (ffm->packet_size != FFM_PACKET_SIZE) |
| goto fail; |
| ffm->write_index = get_be64(pb); |
| /* get also filesize */ |
| if (!url_is_streamed(pb)) { |
| ffm->file_size = url_fsize(pb); |
| adjust_write_index(s); |
| } else { |
| ffm->file_size = (UINT64_C(1) << 63) - 1; |
| } |
| |
| nb_streams = get_be32(pb); |
| get_be32(pb); /* total bitrate */ |
| /* read each stream */ |
| for(i=0;i<nb_streams;i++) { |
| char rc_eq_buf[128]; |
| |
| st = av_new_stream(s, 0); |
| if (!st) |
| goto fail; |
| s->streams[i] = st; |
| |
| av_set_pts_info(st, 64, 1, 1000000); |
| |
| codec = st->codec; |
| /* generic info */ |
| codec->codec_id = get_be32(pb); |
| codec->codec_type = get_byte(pb); /* codec_type */ |
| codec->bit_rate = get_be32(pb); |
| st->quality = get_be32(pb); |
| codec->flags = get_be32(pb); |
| codec->flags2 = get_be32(pb); |
| codec->debug = get_be32(pb); |
| /* specific info */ |
| switch(codec->codec_type) { |
| case CODEC_TYPE_VIDEO: |
| codec->time_base.num = get_be32(pb); |
| codec->time_base.den = get_be32(pb); |
| codec->width = get_be16(pb); |
| codec->height = get_be16(pb); |
| codec->gop_size = get_be16(pb); |
| codec->pix_fmt = get_be32(pb); |
| codec->qmin = get_byte(pb); |
| codec->qmax = get_byte(pb); |
| codec->max_qdiff = get_byte(pb); |
| codec->qcompress = get_be16(pb) / 10000.0; |
| codec->qblur = get_be16(pb) / 10000.0; |
| codec->bit_rate_tolerance = get_be32(pb); |
| codec->rc_eq = av_strdup(get_strz(pb, rc_eq_buf, sizeof(rc_eq_buf))); |
| codec->rc_max_rate = get_be32(pb); |
| codec->rc_min_rate = get_be32(pb); |
| codec->rc_buffer_size = get_be32(pb); |
| codec->i_quant_factor = av_int2dbl(get_be64(pb)); |
| codec->b_quant_factor = av_int2dbl(get_be64(pb)); |
| codec->i_quant_offset = av_int2dbl(get_be64(pb)); |
| codec->b_quant_offset = av_int2dbl(get_be64(pb)); |
| codec->dct_algo = get_be32(pb); |
| codec->strict_std_compliance = get_be32(pb); |
| codec->max_b_frames = get_be32(pb); |
| codec->luma_elim_threshold = get_be32(pb); |
| codec->chroma_elim_threshold = get_be32(pb); |
| codec->mpeg_quant = get_be32(pb); |
| codec->intra_dc_precision = get_be32(pb); |
| codec->me_method = get_be32(pb); |
| codec->mb_decision = get_be32(pb); |
| codec->nsse_weight = get_be32(pb); |
| codec->frame_skip_cmp = get_be32(pb); |
| codec->rc_buffer_aggressivity = av_int2dbl(get_be64(pb)); |
| codec->codec_tag = get_be32(pb); |
| codec->thread_count = get_byte(pb); |
| break; |
| case CODEC_TYPE_AUDIO: |
| codec->sample_rate = get_be32(pb); |
| codec->channels = get_le16(pb); |
| codec->frame_size = get_le16(pb); |
| break; |
| default: |
| goto fail; |
| } |
| if (codec->flags & CODEC_FLAG_GLOBAL_HEADER) { |
| codec->extradata_size = get_be32(pb); |
| codec->extradata = av_malloc(codec->extradata_size); |
| if (!codec->extradata) |
| return AVERROR(ENOMEM); |
| get_buffer(pb, codec->extradata, codec->extradata_size); |
| } |
| } |
| |
| /* get until end of block reached */ |
| while ((url_ftell(pb) % ffm->packet_size) != 0) |
| get_byte(pb); |
| |
| /* init packet demux */ |
| ffm->packet_ptr = ffm->packet; |
| ffm->packet_end = ffm->packet; |
| ffm->frame_offset = 0; |
| ffm->dts = 0; |
| ffm->read_state = READ_HEADER; |
| ffm->first_packet = 1; |
| return 0; |
| fail: |
| for(i=0;i<s->nb_streams;i++) { |
| st = s->streams[i]; |
| if (st) { |
| av_free(st); |
| } |
| } |
| return -1; |
| } |
| |
| /* return < 0 if eof */ |
| static int ffm_read_packet(AVFormatContext *s, AVPacket *pkt) |
| { |
| int size; |
| FFMContext *ffm = s->priv_data; |
| int duration; |
| |
| if (url_fsize(s->pb) == FFM_PACKET_SIZE) |
| return -1; |
| |
| switch(ffm->read_state) { |
| case READ_HEADER: |
| if (!ffm_is_avail_data(s, FRAME_HEADER_SIZE+4)) { |
| return AVERROR(EAGAIN); |
| } |
| dprintf(s, "pos=%08"PRIx64" spos=%"PRIx64", write_index=%"PRIx64" size=%"PRIx64"\n", |
| url_ftell(s->pb), s->pb->pos, ffm->write_index, ffm->file_size); |
| if (ffm_read_data(s, ffm->header, FRAME_HEADER_SIZE, 1) != |
| FRAME_HEADER_SIZE) |
| return AVERROR(EAGAIN); |
| if (ffm->header[1] & FLAG_DTS) |
| if (ffm_read_data(s, ffm->header+16, 4, 1) != 4) |
| return AVERROR(EAGAIN); |
| #if 0 |
| av_hexdump_log(s, AV_LOG_DEBUG, ffm->header, FRAME_HEADER_SIZE); |
| #endif |
| ffm->read_state = READ_DATA; |
| /* fall thru */ |
| case READ_DATA: |
| size = AV_RB24(ffm->header + 2); |
| if (!ffm_is_avail_data(s, size)) { |
| return AVERROR(EAGAIN); |
| } |
| |
| duration = AV_RB24(ffm->header + 5); |
| |
| av_new_packet(pkt, size); |
| pkt->stream_index = ffm->header[0]; |
| if ((unsigned)pkt->stream_index >= s->nb_streams) { |
| av_log(s, AV_LOG_ERROR, "invalid stream index %d\n", pkt->stream_index); |
| av_free_packet(pkt); |
| ffm->read_state = READ_HEADER; |
| return AVERROR(EAGAIN); |
| } |
| pkt->pos = url_ftell(s->pb); |
| if (ffm->header[1] & FLAG_KEY_FRAME) |
| pkt->flags |= PKT_FLAG_KEY; |
| |
| ffm->read_state = READ_HEADER; |
| if (ffm_read_data(s, pkt->data, size, 0) != size) { |
| /* bad case: desynchronized packet. we cancel all the packet loading */ |
| av_free_packet(pkt); |
| return AVERROR(EAGAIN); |
| } |
| pkt->pts = AV_RB64(ffm->header+8); |
| if (ffm->header[1] & FLAG_DTS) |
| pkt->dts = pkt->pts - AV_RB32(ffm->header+16); |
| else |
| pkt->dts = pkt->pts; |
| pkt->duration = duration; |
| break; |
| } |
| return 0; |
| } |
| |
| /* seek to a given time in the file. The file read pointer is |
| positioned at or before pts. XXX: the following code is quite |
| approximative */ |
| static int ffm_seek(AVFormatContext *s, int stream_index, int64_t wanted_pts, int flags) |
| { |
| FFMContext *ffm = s->priv_data; |
| int64_t pos_min, pos_max, pos; |
| int64_t pts_min, pts_max, pts; |
| double pos1; |
| |
| #ifdef DEBUG_SEEK |
| av_log(s, AV_LOG_DEBUG, "wanted_pts=%0.6f\n", wanted_pts / 1000000.0); |
| #endif |
| /* find the position using linear interpolation (better than |
| dichotomy in typical cases) */ |
| pos_min = 0; |
| pos_max = ffm->file_size - 2 * FFM_PACKET_SIZE; |
| while (pos_min <= pos_max) { |
| pts_min = get_dts(s, pos_min); |
| pts_max = get_dts(s, pos_max); |
| /* linear interpolation */ |
| pos1 = (double)(pos_max - pos_min) * (double)(wanted_pts - pts_min) / |
| (double)(pts_max - pts_min); |
| pos = (((int64_t)pos1) / FFM_PACKET_SIZE) * FFM_PACKET_SIZE; |
| if (pos <= pos_min) |
| pos = pos_min; |
| else if (pos >= pos_max) |
| pos = pos_max; |
| pts = get_dts(s, pos); |
| /* check if we are lucky */ |
| if (pts == wanted_pts) { |
| goto found; |
| } else if (pts > wanted_pts) { |
| pos_max = pos - FFM_PACKET_SIZE; |
| } else { |
| pos_min = pos + FFM_PACKET_SIZE; |
| } |
| } |
| pos = (flags & AVSEEK_FLAG_BACKWARD) ? pos_min : pos_max; |
| if (pos > 0) |
| pos -= FFM_PACKET_SIZE; |
| found: |
| ffm_seek1(s, pos); |
| |
| /* reset read state */ |
| ffm->read_state = READ_HEADER; |
| ffm->packet_ptr = ffm->packet; |
| ffm->packet_end = ffm->packet; |
| ffm->first_packet = 1; |
| |
| return 0; |
| } |
| |
| static int ffm_probe(AVProbeData *p) |
| { |
| if ( |
| p->buf[0] == 'F' && p->buf[1] == 'F' && p->buf[2] == 'M' && |
| p->buf[3] == '1') |
| return AVPROBE_SCORE_MAX + 1; |
| return 0; |
| } |
| |
| AVInputFormat ffm_demuxer = { |
| "ffm", |
| NULL_IF_CONFIG_SMALL("FFM (FFserver live feed) format"), |
| sizeof(FFMContext), |
| ffm_probe, |
| ffm_read_header, |
| ffm_read_packet, |
| NULL, |
| ffm_seek, |
| }; |
