Details | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 6148 | serge | 1 | /* |
| 2 | * FFM (ffserver live feed) demuxer |
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| 3 | * Copyright (c) 2001 Fabrice Bellard |
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| 4 | * |
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| 5 | * This file is part of FFmpeg. |
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| 6 | * |
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| 7 | * FFmpeg is free software; you can redistribute it and/or |
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| 8 | * modify it under the terms of the GNU Lesser General Public |
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| 9 | * License as published by the Free Software Foundation; either |
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| 10 | * version 2.1 of the License, or (at your option) any later version. |
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| 11 | * |
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| 12 | * FFmpeg is distributed in the hope that it will be useful, |
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| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 15 | * Lesser General Public License for more details. |
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| 16 | * |
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| 17 | * You should have received a copy of the GNU Lesser General Public |
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| 18 | * License along with FFmpeg; if not, write to the Free Software |
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| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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| 20 | */ |
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| 21 | |||
| 22 | #include "libavutil/intreadwrite.h" |
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| 23 | #include "libavutil/intfloat.h" |
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| 24 | #include "avformat.h" |
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| 25 | #include "internal.h" |
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| 26 | #include "ffm.h" |
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| 27 | #include "avio_internal.h" |
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| 28 | |||
| 29 | static int ffm_is_avail_data(AVFormatContext *s, int size) |
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| 30 | { |
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| 31 | FFMContext *ffm = s->priv_data; |
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| 32 | int64_t pos, avail_size; |
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| 33 | int len; |
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| 34 | |||
| 35 | len = ffm->packet_end - ffm->packet_ptr; |
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| 36 | if (size <= len) |
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| 37 | return 1; |
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| 38 | pos = avio_tell(s->pb); |
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| 39 | if (!ffm->write_index) { |
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| 40 | if (pos == ffm->file_size) |
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| 41 | return AVERROR_EOF; |
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| 42 | avail_size = ffm->file_size - pos; |
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| 43 | } else { |
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| 44 | if (pos == ffm->write_index) { |
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| 45 | /* exactly at the end of stream */ |
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| 46 | return AVERROR(EAGAIN); |
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| 47 | } else if (pos < ffm->write_index) { |
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| 48 | avail_size = ffm->write_index - pos; |
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| 49 | } else { |
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| 50 | avail_size = (ffm->file_size - pos) + (ffm->write_index - FFM_PACKET_SIZE); |
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| 51 | } |
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| 52 | } |
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| 53 | avail_size = (avail_size / ffm->packet_size) * (ffm->packet_size - FFM_HEADER_SIZE) + len; |
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| 54 | if (size <= avail_size) |
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| 55 | return 1; |
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| 56 | else |
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| 57 | return AVERROR(EAGAIN); |
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| 58 | } |
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| 59 | |||
| 60 | static int ffm_resync(AVFormatContext *s, int state) |
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| 61 | { |
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| 62 | av_log(s, AV_LOG_ERROR, "resyncing\n"); |
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| 63 | while (state != PACKET_ID) { |
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| 64 | if (url_feof(s->pb)) { |
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| 65 | av_log(s, AV_LOG_ERROR, "cannot find FFM syncword\n"); |
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| 66 | return -1; |
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| 67 | } |
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| 68 | state = (state << 8) | avio_r8(s->pb); |
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| 69 | } |
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| 70 | return 0; |
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| 71 | } |
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| 72 | |||
| 73 | /* first is true if we read the frame header */ |
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| 74 | static int ffm_read_data(AVFormatContext *s, |
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| 75 | uint8_t *buf, int size, int header) |
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| 76 | { |
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| 77 | FFMContext *ffm = s->priv_data; |
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| 78 | AVIOContext *pb = s->pb; |
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| 79 | int len, fill_size, size1, frame_offset, id; |
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| 80 | |||
| 81 | size1 = size; |
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| 82 | while (size > 0) { |
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| 83 | redo: |
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| 84 | len = ffm->packet_end - ffm->packet_ptr; |
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| 85 | if (len < 0) |
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| 86 | return -1; |
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| 87 | if (len > size) |
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| 88 | len = size; |
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| 89 | if (len == 0) { |
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| 90 | if (avio_tell(pb) == ffm->file_size) |
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| 91 | avio_seek(pb, ffm->packet_size, SEEK_SET); |
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| 92 | retry_read: |
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| 93 | if (pb->buffer_size != ffm->packet_size) { |
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| 94 | int64_t tell = avio_tell(pb); |
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| 95 | ffio_set_buf_size(pb, ffm->packet_size); |
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| 96 | avio_seek(pb, tell, SEEK_SET); |
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| 97 | } |
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| 98 | id = avio_rb16(pb); /* PACKET_ID */ |
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| 99 | if (id != PACKET_ID) |
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| 100 | if (ffm_resync(s, id) < 0) |
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| 101 | return -1; |
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| 102 | fill_size = avio_rb16(pb); |
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| 103 | ffm->dts = avio_rb64(pb); |
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| 104 | frame_offset = avio_rb16(pb); |
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| 105 | avio_read(pb, ffm->packet, ffm->packet_size - FFM_HEADER_SIZE); |
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| 106 | ffm->packet_end = ffm->packet + (ffm->packet_size - FFM_HEADER_SIZE - fill_size); |
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| 107 | if (ffm->packet_end < ffm->packet || frame_offset < 0) |
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| 108 | return -1; |
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| 109 | /* if first packet or resynchronization packet, we must |
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| 110 | handle it specifically */ |
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| 111 | if (ffm->first_packet || (frame_offset & 0x8000)) { |
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| 112 | if (!frame_offset) { |
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| 113 | /* This packet has no frame headers in it */ |
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| 114 | if (avio_tell(pb) >= ffm->packet_size * 3LL) { |
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| 115 | avio_seek(pb, -ffm->packet_size * 2LL, SEEK_CUR); |
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| 116 | goto retry_read; |
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| 117 | } |
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| 118 | /* This is bad, we cannot find a valid frame header */ |
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| 119 | return 0; |
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| 120 | } |
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| 121 | ffm->first_packet = 0; |
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| 122 | if ((frame_offset & 0x7fff) < FFM_HEADER_SIZE) |
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| 123 | return -1; |
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| 124 | ffm->packet_ptr = ffm->packet + (frame_offset & 0x7fff) - FFM_HEADER_SIZE; |
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| 125 | if (!header) |
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| 126 | break; |
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| 127 | } else { |
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| 128 | ffm->packet_ptr = ffm->packet; |
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| 129 | } |
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| 130 | goto redo; |
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| 131 | } |
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| 132 | memcpy(buf, ffm->packet_ptr, len); |
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| 133 | buf += len; |
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| 134 | ffm->packet_ptr += len; |
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| 135 | size -= len; |
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| 136 | header = 0; |
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| 137 | } |
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| 138 | return size1 - size; |
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| 139 | } |
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| 140 | |||
| 141 | /* ensure that acutal seeking happens between FFM_PACKET_SIZE |
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| 142 | and file_size - FFM_PACKET_SIZE */ |
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| 143 | static int64_t ffm_seek1(AVFormatContext *s, int64_t pos1) |
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| 144 | { |
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| 145 | FFMContext *ffm = s->priv_data; |
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| 146 | AVIOContext *pb = s->pb; |
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| 147 | int64_t pos; |
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| 148 | |||
| 149 | pos = FFMIN(pos1, ffm->file_size - FFM_PACKET_SIZE); |
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| 150 | pos = FFMAX(pos, FFM_PACKET_SIZE); |
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| 151 | av_dlog(s, "seek to %"PRIx64" -> %"PRIx64"\n", pos1, pos); |
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| 152 | return avio_seek(pb, pos, SEEK_SET); |
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| 153 | } |
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| 154 | |||
| 155 | static int64_t get_dts(AVFormatContext *s, int64_t pos) |
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| 156 | { |
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| 157 | AVIOContext *pb = s->pb; |
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| 158 | int64_t dts; |
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| 159 | |||
| 160 | ffm_seek1(s, pos); |
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| 161 | avio_skip(pb, 4); |
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| 162 | dts = avio_rb64(pb); |
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| 163 | av_dlog(s, "dts=%0.6f\n", dts / 1000000.0); |
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| 164 | return dts; |
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| 165 | } |
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| 166 | |||
| 167 | static void adjust_write_index(AVFormatContext *s) |
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| 168 | { |
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| 169 | FFMContext *ffm = s->priv_data; |
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| 170 | AVIOContext *pb = s->pb; |
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| 171 | int64_t pts; |
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| 172 | //int64_t orig_write_index = ffm->write_index; |
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| 173 | int64_t pos_min, pos_max; |
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| 174 | int64_t pts_start; |
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| 175 | int64_t ptr = avio_tell(pb); |
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| 176 | |||
| 177 | |||
| 178 | pos_min = 0; |
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| 179 | pos_max = ffm->file_size - 2 * FFM_PACKET_SIZE; |
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| 180 | |||
| 181 | pts_start = get_dts(s, pos_min); |
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| 182 | |||
| 183 | pts = get_dts(s, pos_max); |
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| 184 | |||
| 185 | if (pts - 100000 > pts_start) |
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| 186 | goto end; |
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| 187 | |||
| 188 | ffm->write_index = FFM_PACKET_SIZE; |
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| 189 | |||
| 190 | pts_start = get_dts(s, pos_min); |
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| 191 | |||
| 192 | pts = get_dts(s, pos_max); |
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| 193 | |||
| 194 | if (pts - 100000 <= pts_start) { |
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| 195 | while (1) { |
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| 196 | int64_t newpos; |
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| 197 | int64_t newpts; |
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| 198 | |||
| 199 | newpos = ((pos_max + pos_min) / (2 * FFM_PACKET_SIZE)) * FFM_PACKET_SIZE; |
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| 200 | |||
| 201 | if (newpos == pos_min) |
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| 202 | break; |
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| 203 | |||
| 204 | newpts = get_dts(s, newpos); |
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| 205 | |||
| 206 | if (newpts - 100000 <= pts) { |
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| 207 | pos_max = newpos; |
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| 208 | pts = newpts; |
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| 209 | } else { |
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| 210 | pos_min = newpos; |
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| 211 | } |
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| 212 | } |
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| 213 | ffm->write_index += pos_max; |
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| 214 | } |
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| 215 | |||
| 216 | end: |
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| 217 | avio_seek(pb, ptr, SEEK_SET); |
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| 218 | } |
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| 219 | |||
| 220 | |||
| 221 | static int ffm_close(AVFormatContext *s) |
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| 222 | { |
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| 223 | int i; |
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| 224 | |||
| 225 | for (i = 0; i < s->nb_streams; i++) |
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| 226 | av_freep(&s->streams[i]->codec->rc_eq); |
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| 227 | |||
| 228 | return 0; |
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| 229 | } |
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| 230 | |||
| 231 | static int ffm2_read_header(AVFormatContext *s) |
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| 232 | { |
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| 233 | FFMContext *ffm = s->priv_data; |
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| 234 | AVStream *st; |
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| 235 | AVIOContext *pb = s->pb; |
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| 236 | AVCodecContext *codec; |
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| 237 | |||
| 238 | ffm->packet_size = avio_rb32(pb); |
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| 239 | if (ffm->packet_size != FFM_PACKET_SIZE) |
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| 240 | goto fail; |
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| 241 | ffm->write_index = avio_rb64(pb); |
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| 242 | /* get also filesize */ |
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| 243 | if (pb->seekable) { |
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| 244 | ffm->file_size = avio_size(pb); |
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| 245 | if (ffm->write_index && 0) |
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| 246 | adjust_write_index(s); |
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| 247 | } else { |
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| 248 | ffm->file_size = (UINT64_C(1) << 63) - 1; |
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| 249 | } |
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| 250 | |||
| 251 | while(!url_feof(pb)) { |
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| 252 | unsigned id = avio_rb32(pb); |
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| 253 | unsigned size = avio_rb32(pb); |
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| 254 | int64_t next = avio_tell(pb) + size; |
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| 255 | char rc_eq_buf[128]; |
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| 256 | |||
| 257 | if(!id) |
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| 258 | break; |
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| 259 | |||
| 260 | switch(id) { |
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| 261 | case MKBETAG('M', 'A', 'I', 'N'): |
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| 262 | avio_rb32(pb); /* nb_streams */ |
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| 263 | avio_rb32(pb); /* total bitrate */ |
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| 264 | break; |
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| 265 | case MKBETAG('C', 'O', 'M', 'M'): |
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| 266 | st = avformat_new_stream(s, NULL); |
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| 267 | if (!st) |
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| 268 | goto fail; |
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| 269 | |||
| 270 | avpriv_set_pts_info(st, 64, 1, 1000000); |
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| 271 | |||
| 272 | codec = st->codec; |
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| 273 | /* generic info */ |
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| 274 | codec->codec_id = avio_rb32(pb); |
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| 275 | codec->codec_type = avio_r8(pb); |
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| 276 | codec->bit_rate = avio_rb32(pb); |
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| 277 | codec->flags = avio_rb32(pb); |
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| 278 | codec->flags2 = avio_rb32(pb); |
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| 279 | codec->debug = avio_rb32(pb); |
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| 280 | if (codec->flags & CODEC_FLAG_GLOBAL_HEADER) { |
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| 281 | if (ff_alloc_extradata(codec, avio_rb32(pb))) |
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| 282 | return AVERROR(ENOMEM); |
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| 283 | avio_read(pb, codec->extradata, codec->extradata_size); |
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| 284 | } |
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| 285 | avio_seek(pb, next, SEEK_SET); |
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| 286 | id = avio_rb32(pb); |
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| 287 | size = avio_rb32(pb); |
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| 288 | next = avio_tell(pb) + size; |
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| 289 | switch(id) { |
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| 290 | case MKBETAG('S', 'T', 'V', 'I'): |
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| 291 | codec->time_base.num = avio_rb32(pb); |
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| 292 | codec->time_base.den = avio_rb32(pb); |
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| 293 | codec->width = avio_rb16(pb); |
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| 294 | codec->height = avio_rb16(pb); |
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| 295 | codec->gop_size = avio_rb16(pb); |
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| 296 | codec->pix_fmt = avio_rb32(pb); |
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| 297 | codec->qmin = avio_r8(pb); |
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| 298 | codec->qmax = avio_r8(pb); |
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| 299 | codec->max_qdiff = avio_r8(pb); |
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| 300 | codec->qcompress = avio_rb16(pb) / 10000.0; |
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| 301 | codec->qblur = avio_rb16(pb) / 10000.0; |
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| 302 | codec->bit_rate_tolerance = avio_rb32(pb); |
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| 303 | avio_get_str(pb, INT_MAX, rc_eq_buf, sizeof(rc_eq_buf)); |
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| 304 | codec->rc_eq = av_strdup(rc_eq_buf); |
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| 305 | codec->rc_max_rate = avio_rb32(pb); |
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| 306 | codec->rc_min_rate = avio_rb32(pb); |
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| 307 | codec->rc_buffer_size = avio_rb32(pb); |
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| 308 | codec->i_quant_factor = av_int2double(avio_rb64(pb)); |
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| 309 | codec->b_quant_factor = av_int2double(avio_rb64(pb)); |
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| 310 | codec->i_quant_offset = av_int2double(avio_rb64(pb)); |
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| 311 | codec->b_quant_offset = av_int2double(avio_rb64(pb)); |
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| 312 | codec->dct_algo = avio_rb32(pb); |
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| 313 | codec->strict_std_compliance = avio_rb32(pb); |
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| 314 | codec->max_b_frames = avio_rb32(pb); |
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| 315 | codec->mpeg_quant = avio_rb32(pb); |
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| 316 | codec->intra_dc_precision = avio_rb32(pb); |
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| 317 | codec->me_method = avio_rb32(pb); |
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| 318 | codec->mb_decision = avio_rb32(pb); |
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| 319 | codec->nsse_weight = avio_rb32(pb); |
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| 320 | codec->frame_skip_cmp = avio_rb32(pb); |
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| 321 | codec->rc_buffer_aggressivity = av_int2double(avio_rb64(pb)); |
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| 322 | codec->codec_tag = avio_rb32(pb); |
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| 323 | codec->thread_count = avio_r8(pb); |
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| 324 | codec->coder_type = avio_rb32(pb); |
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| 325 | codec->me_cmp = avio_rb32(pb); |
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| 326 | codec->me_subpel_quality = avio_rb32(pb); |
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| 327 | codec->me_range = avio_rb32(pb); |
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| 328 | codec->keyint_min = avio_rb32(pb); |
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| 329 | codec->scenechange_threshold = avio_rb32(pb); |
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| 330 | codec->b_frame_strategy = avio_rb32(pb); |
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| 331 | codec->qcompress = av_int2double(avio_rb64(pb)); |
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| 332 | codec->qblur = av_int2double(avio_rb64(pb)); |
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| 333 | codec->max_qdiff = avio_rb32(pb); |
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| 334 | codec->refs = avio_rb32(pb); |
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| 335 | break; |
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| 336 | case MKBETAG('S', 'T', 'A', 'U'): |
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| 337 | codec->sample_rate = avio_rb32(pb); |
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| 338 | codec->channels = avio_rl16(pb); |
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| 339 | codec->frame_size = avio_rl16(pb); |
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| 340 | break; |
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| 341 | } |
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| 342 | break; |
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| 343 | } |
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| 344 | avio_seek(pb, next, SEEK_SET); |
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| 345 | } |
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| 346 | |||
| 347 | /* get until end of block reached */ |
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| 348 | while ((avio_tell(pb) % ffm->packet_size) != 0) |
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| 349 | avio_r8(pb); |
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| 350 | |||
| 351 | /* init packet demux */ |
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| 352 | ffm->packet_ptr = ffm->packet; |
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| 353 | ffm->packet_end = ffm->packet; |
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| 354 | ffm->frame_offset = 0; |
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| 355 | ffm->dts = 0; |
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| 356 | ffm->read_state = READ_HEADER; |
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| 357 | ffm->first_packet = 1; |
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| 358 | return 0; |
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| 359 | fail: |
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| 360 | ffm_close(s); |
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| 361 | return -1; |
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| 362 | } |
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| 363 | |||
| 364 | static int ffm_read_header(AVFormatContext *s) |
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| 365 | { |
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| 366 | FFMContext *ffm = s->priv_data; |
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| 367 | AVStream *st; |
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| 368 | AVIOContext *pb = s->pb; |
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| 369 | AVCodecContext *codec; |
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| 370 | int i, nb_streams; |
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| 371 | uint32_t tag; |
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| 372 | |||
| 373 | /* header */ |
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| 374 | tag = avio_rl32(pb); |
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| 375 | if (tag == MKTAG('F', 'F', 'M', '2')) |
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| 376 | return ffm2_read_header(s); |
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| 377 | if (tag != MKTAG('F', 'F', 'M', '1')) |
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| 378 | goto fail; |
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| 379 | ffm->packet_size = avio_rb32(pb); |
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| 380 | if (ffm->packet_size != FFM_PACKET_SIZE) |
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| 381 | goto fail; |
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| 382 | ffm->write_index = avio_rb64(pb); |
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| 383 | /* get also filesize */ |
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| 384 | if (pb->seekable) { |
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| 385 | ffm->file_size = avio_size(pb); |
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| 386 | if (ffm->write_index && 0) |
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| 387 | adjust_write_index(s); |
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| 388 | } else { |
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| 389 | ffm->file_size = (UINT64_C(1) << 63) - 1; |
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| 390 | } |
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| 391 | |||
| 392 | nb_streams = avio_rb32(pb); |
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| 393 | avio_rb32(pb); /* total bitrate */ |
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| 394 | /* read each stream */ |
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| 395 | for(i=0;i |
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| 396 | char rc_eq_buf[128]; |
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| 397 | |||
| 398 | st = avformat_new_stream(s, NULL); |
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| 399 | if (!st) |
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| 400 | goto fail; |
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| 401 | |||
| 402 | avpriv_set_pts_info(st, 64, 1, 1000000); |
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| 403 | |||
| 404 | codec = st->codec; |
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| 405 | /* generic info */ |
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| 406 | codec->codec_id = avio_rb32(pb); |
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| 407 | codec->codec_type = avio_r8(pb); /* codec_type */ |
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| 408 | codec->bit_rate = avio_rb32(pb); |
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| 409 | codec->flags = avio_rb32(pb); |
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| 410 | codec->flags2 = avio_rb32(pb); |
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| 411 | codec->debug = avio_rb32(pb); |
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| 412 | /* specific info */ |
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| 413 | switch(codec->codec_type) { |
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| 414 | case AVMEDIA_TYPE_VIDEO: |
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| 415 | codec->time_base.num = avio_rb32(pb); |
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| 416 | codec->time_base.den = avio_rb32(pb); |
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| 417 | codec->width = avio_rb16(pb); |
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| 418 | codec->height = avio_rb16(pb); |
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| 419 | codec->gop_size = avio_rb16(pb); |
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| 420 | codec->pix_fmt = avio_rb32(pb); |
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| 421 | codec->qmin = avio_r8(pb); |
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| 422 | codec->qmax = avio_r8(pb); |
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| 423 | codec->max_qdiff = avio_r8(pb); |
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| 424 | codec->qcompress = avio_rb16(pb) / 10000.0; |
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| 425 | codec->qblur = avio_rb16(pb) / 10000.0; |
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| 426 | codec->bit_rate_tolerance = avio_rb32(pb); |
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| 427 | avio_get_str(pb, INT_MAX, rc_eq_buf, sizeof(rc_eq_buf)); |
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| 428 | codec->rc_eq = av_strdup(rc_eq_buf); |
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| 429 | codec->rc_max_rate = avio_rb32(pb); |
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| 430 | codec->rc_min_rate = avio_rb32(pb); |
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| 431 | codec->rc_buffer_size = avio_rb32(pb); |
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| 432 | codec->i_quant_factor = av_int2double(avio_rb64(pb)); |
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| 433 | codec->b_quant_factor = av_int2double(avio_rb64(pb)); |
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| 434 | codec->i_quant_offset = av_int2double(avio_rb64(pb)); |
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| 435 | codec->b_quant_offset = av_int2double(avio_rb64(pb)); |
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| 436 | codec->dct_algo = avio_rb32(pb); |
||
| 437 | codec->strict_std_compliance = avio_rb32(pb); |
||
| 438 | codec->max_b_frames = avio_rb32(pb); |
||
| 439 | codec->mpeg_quant = avio_rb32(pb); |
||
| 440 | codec->intra_dc_precision = avio_rb32(pb); |
||
| 441 | codec->me_method = avio_rb32(pb); |
||
| 442 | codec->mb_decision = avio_rb32(pb); |
||
| 443 | codec->nsse_weight = avio_rb32(pb); |
||
| 444 | codec->frame_skip_cmp = avio_rb32(pb); |
||
| 445 | codec->rc_buffer_aggressivity = av_int2double(avio_rb64(pb)); |
||
| 446 | codec->codec_tag = avio_rb32(pb); |
||
| 447 | codec->thread_count = avio_r8(pb); |
||
| 448 | codec->coder_type = avio_rb32(pb); |
||
| 449 | codec->me_cmp = avio_rb32(pb); |
||
| 450 | codec->me_subpel_quality = avio_rb32(pb); |
||
| 451 | codec->me_range = avio_rb32(pb); |
||
| 452 | codec->keyint_min = avio_rb32(pb); |
||
| 453 | codec->scenechange_threshold = avio_rb32(pb); |
||
| 454 | codec->b_frame_strategy = avio_rb32(pb); |
||
| 455 | codec->qcompress = av_int2double(avio_rb64(pb)); |
||
| 456 | codec->qblur = av_int2double(avio_rb64(pb)); |
||
| 457 | codec->max_qdiff = avio_rb32(pb); |
||
| 458 | codec->refs = avio_rb32(pb); |
||
| 459 | break; |
||
| 460 | case AVMEDIA_TYPE_AUDIO: |
||
| 461 | codec->sample_rate = avio_rb32(pb); |
||
| 462 | codec->channels = avio_rl16(pb); |
||
| 463 | codec->frame_size = avio_rl16(pb); |
||
| 464 | break; |
||
| 465 | default: |
||
| 466 | goto fail; |
||
| 467 | } |
||
| 468 | if (codec->flags & CODEC_FLAG_GLOBAL_HEADER) { |
||
| 469 | if (ff_alloc_extradata(codec, avio_rb32(pb))) |
||
| 470 | return AVERROR(ENOMEM); |
||
| 471 | avio_read(pb, codec->extradata, codec->extradata_size); |
||
| 472 | } |
||
| 473 | } |
||
| 474 | |||
| 475 | /* get until end of block reached */ |
||
| 476 | while ((avio_tell(pb) % ffm->packet_size) != 0) |
||
| 477 | avio_r8(pb); |
||
| 478 | |||
| 479 | /* init packet demux */ |
||
| 480 | ffm->packet_ptr = ffm->packet; |
||
| 481 | ffm->packet_end = ffm->packet; |
||
| 482 | ffm->frame_offset = 0; |
||
| 483 | ffm->dts = 0; |
||
| 484 | ffm->read_state = READ_HEADER; |
||
| 485 | ffm->first_packet = 1; |
||
| 486 | return 0; |
||
| 487 | fail: |
||
| 488 | ffm_close(s); |
||
| 489 | return -1; |
||
| 490 | } |
||
| 491 | |||
| 492 | /* return < 0 if eof */ |
||
| 493 | static int ffm_read_packet(AVFormatContext *s, AVPacket *pkt) |
||
| 494 | { |
||
| 495 | int size; |
||
| 496 | FFMContext *ffm = s->priv_data; |
||
| 497 | int duration, ret; |
||
| 498 | |||
| 499 | switch(ffm->read_state) { |
||
| 500 | case READ_HEADER: |
||
| 501 | if ((ret = ffm_is_avail_data(s, FRAME_HEADER_SIZE+4)) < 0) |
||
| 502 | return ret; |
||
| 503 | |||
| 504 | av_dlog(s, "pos=%08"PRIx64" spos=%"PRIx64", write_index=%"PRIx64" size=%"PRIx64"\n", |
||
| 505 | avio_tell(s->pb), s->pb->pos, ffm->write_index, ffm->file_size); |
||
| 506 | if (ffm_read_data(s, ffm->header, FRAME_HEADER_SIZE, 1) != |
||
| 507 | FRAME_HEADER_SIZE) |
||
| 508 | return -1; |
||
| 509 | if (ffm->header[1] & FLAG_DTS) |
||
| 510 | if (ffm_read_data(s, ffm->header+16, 4, 1) != 4) |
||
| 511 | return -1; |
||
| 512 | ffm->read_state = READ_DATA; |
||
| 513 | /* fall thru */ |
||
| 514 | case READ_DATA: |
||
| 515 | size = AV_RB24(ffm->header + 2); |
||
| 516 | if ((ret = ffm_is_avail_data(s, size)) < 0) |
||
| 517 | return ret; |
||
| 518 | |||
| 519 | duration = AV_RB24(ffm->header + 5); |
||
| 520 | |||
| 521 | if (av_new_packet(pkt, size) < 0) { |
||
| 522 | return AVERROR(ENOMEM); |
||
| 523 | } |
||
| 524 | pkt->stream_index = ffm->header[0]; |
||
| 525 | if ((unsigned)pkt->stream_index >= s->nb_streams) { |
||
| 526 | av_log(s, AV_LOG_ERROR, "invalid stream index %d\n", pkt->stream_index); |
||
| 527 | av_free_packet(pkt); |
||
| 528 | ffm->read_state = READ_HEADER; |
||
| 529 | return -1; |
||
| 530 | } |
||
| 531 | pkt->pos = avio_tell(s->pb); |
||
| 532 | if (ffm->header[1] & FLAG_KEY_FRAME) |
||
| 533 | pkt->flags |= AV_PKT_FLAG_KEY; |
||
| 534 | |||
| 535 | ffm->read_state = READ_HEADER; |
||
| 536 | if (ffm_read_data(s, pkt->data, size, 0) != size) { |
||
| 537 | /* bad case: desynchronized packet. we cancel all the packet loading */ |
||
| 538 | av_free_packet(pkt); |
||
| 539 | return -1; |
||
| 540 | } |
||
| 541 | pkt->pts = AV_RB64(ffm->header+8); |
||
| 542 | if (ffm->header[1] & FLAG_DTS) |
||
| 543 | pkt->dts = pkt->pts - AV_RB32(ffm->header+16); |
||
| 544 | else |
||
| 545 | pkt->dts = pkt->pts; |
||
| 546 | pkt->duration = duration; |
||
| 547 | break; |
||
| 548 | } |
||
| 549 | return 0; |
||
| 550 | } |
||
| 551 | |||
| 552 | /* seek to a given time in the file. The file read pointer is |
||
| 553 | positioned at or before pts. XXX: the following code is quite |
||
| 554 | approximative */ |
||
| 555 | static int ffm_seek(AVFormatContext *s, int stream_index, int64_t wanted_pts, int flags) |
||
| 556 | { |
||
| 557 | FFMContext *ffm = s->priv_data; |
||
| 558 | int64_t pos_min, pos_max, pos; |
||
| 559 | int64_t pts_min, pts_max, pts; |
||
| 560 | double pos1; |
||
| 561 | |||
| 562 | av_dlog(s, "wanted_pts=%0.6f\n", wanted_pts / 1000000.0); |
||
| 563 | /* find the position using linear interpolation (better than |
||
| 564 | dichotomy in typical cases) */ |
||
| 565 | if (ffm->write_index && ffm->write_index < ffm->file_size) { |
||
| 566 | if (get_dts(s, FFM_PACKET_SIZE) < wanted_pts) { |
||
| 567 | pos_min = FFM_PACKET_SIZE; |
||
| 568 | pos_max = ffm->write_index - FFM_PACKET_SIZE; |
||
| 569 | } else { |
||
| 570 | pos_min = ffm->write_index; |
||
| 571 | pos_max = ffm->file_size - FFM_PACKET_SIZE; |
||
| 572 | } |
||
| 573 | } else { |
||
| 574 | pos_min = FFM_PACKET_SIZE; |
||
| 575 | pos_max = ffm->file_size - FFM_PACKET_SIZE; |
||
| 576 | } |
||
| 577 | while (pos_min <= pos_max) { |
||
| 578 | pts_min = get_dts(s, pos_min); |
||
| 579 | pts_max = get_dts(s, pos_max); |
||
| 580 | if (pts_min > wanted_pts || pts_max <= wanted_pts) { |
||
| 581 | pos = pts_min > wanted_pts ? pos_min : pos_max; |
||
| 582 | goto found; |
||
| 583 | } |
||
| 584 | /* linear interpolation */ |
||
| 585 | pos1 = (double)(pos_max - pos_min) * (double)(wanted_pts - pts_min) / |
||
| 586 | (double)(pts_max - pts_min); |
||
| 587 | pos = (((int64_t)pos1) / FFM_PACKET_SIZE) * FFM_PACKET_SIZE; |
||
| 588 | if (pos <= pos_min) |
||
| 589 | pos = pos_min; |
||
| 590 | else if (pos >= pos_max) |
||
| 591 | pos = pos_max; |
||
| 592 | pts = get_dts(s, pos); |
||
| 593 | /* check if we are lucky */ |
||
| 594 | if (pts == wanted_pts) { |
||
| 595 | goto found; |
||
| 596 | } else if (pts > wanted_pts) { |
||
| 597 | pos_max = pos - FFM_PACKET_SIZE; |
||
| 598 | } else { |
||
| 599 | pos_min = pos + FFM_PACKET_SIZE; |
||
| 600 | } |
||
| 601 | } |
||
| 602 | pos = (flags & AVSEEK_FLAG_BACKWARD) ? pos_min : pos_max; |
||
| 603 | |||
| 604 | found: |
||
| 605 | if (ffm_seek1(s, pos) < 0) |
||
| 606 | return -1; |
||
| 607 | |||
| 608 | /* reset read state */ |
||
| 609 | ffm->read_state = READ_HEADER; |
||
| 610 | ffm->packet_ptr = ffm->packet; |
||
| 611 | ffm->packet_end = ffm->packet; |
||
| 612 | ffm->first_packet = 1; |
||
| 613 | |||
| 614 | return 0; |
||
| 615 | } |
||
| 616 | |||
| 617 | static int ffm_probe(AVProbeData *p) |
||
| 618 | { |
||
| 619 | if ( |
||
| 620 | p->buf[0] == 'F' && p->buf[1] == 'F' && p->buf[2] == 'M' && |
||
| 621 | (p->buf[3] == '1' || p->buf[3] == '2')) |
||
| 622 | return AVPROBE_SCORE_MAX + 1; |
||
| 623 | return 0; |
||
| 624 | } |
||
| 625 | |||
| 626 | AVInputFormat ff_ffm_demuxer = { |
||
| 627 | .name = "ffm", |
||
| 628 | .long_name = NULL_IF_CONFIG_SMALL("FFM (FFserver live feed)"), |
||
| 629 | .priv_data_size = sizeof(FFMContext), |
||
| 630 | .read_probe = ffm_probe, |
||
| 631 | .read_header = ffm_read_header, |
||
| 632 | .read_packet = ffm_read_packet, |
||
| 633 | .read_close = ffm_close, |
||
| 634 | .read_seek = ffm_seek, |
||
| 635 | }; |