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|---|---|---|---|
| 1 | /* | ||
| 2 | * MxPEG clip file demuxer | ||
| 3 | * Copyright (c) 2010 Anatoly Nenashev | ||
| 4 | * | ||
| 5 | * This file is part of FFmpeg. | ||
| 6 | * | ||
| 7 | * FFmpeg is free software; you can redistribute it and/or | ||
| 8 | * modify it under the terms of the GNU Lesser General Public | ||
| 9 | * License as published by the Free Software Foundation; either | ||
| 10 | * version 2.1 of the License, or (at your option) any later version. | ||
| 11 | * | ||
| 12 | * FFmpeg is distributed in the hope that it will be useful, | ||
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
| 15 | * Lesser General Public License for more details. | ||
| 16 | * | ||
| 17 | * You should have received a copy of the GNU Lesser General Public | ||
| 18 | * License along with FFmpeg; if not, write to the Free Software | ||
| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | ||
| 20 | */ | ||
| 21 | |||
| 22 | #include "libavutil/channel_layout.h" | ||
| 23 | #include "libavutil/internal.h" | ||
| 24 | #include "libavutil/intreadwrite.h" | ||
| 25 | #include "libavutil/mem.h" | ||
| 26 | #include "libavcodec/mjpeg.h" | ||
| 27 | #include "avformat.h" | ||
| 28 | #include "demux.h" | ||
| 29 | #include "internal.h" | ||
| 30 | #include "avio.h" | ||
| 31 | |||
| 32 | #define DEFAULT_PACKET_SIZE 1024 | ||
| 33 | #define OVERREAD_SIZE 3 | ||
| 34 | |||
| 35 | typedef struct MXGContext { | ||
| 36 | uint8_t *buffer; | ||
| 37 | uint8_t *buffer_ptr; | ||
| 38 | uint8_t *soi_ptr; | ||
| 39 | unsigned int buffer_size; | ||
| 40 | int64_t dts; | ||
| 41 | unsigned int cache_size; | ||
| 42 | } MXGContext; | ||
| 43 | |||
| 44 | 1 | static int mxg_read_header(AVFormatContext *s) | |
| 45 | { | ||
| 46 | AVStream *video_st, *audio_st; | ||
| 47 | 1 | MXGContext *mxg = s->priv_data; | |
| 48 | |||
| 49 | /* video parameters will be extracted from the compressed bitstream */ | ||
| 50 | 1 | video_st = avformat_new_stream(s, NULL); | |
| 51 |
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1 | if (!video_st) |
| 52 | ✗ | return AVERROR(ENOMEM); | |
| 53 | 1 | video_st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO; | |
| 54 | 1 | video_st->codecpar->codec_id = AV_CODEC_ID_MXPEG; | |
| 55 | 1 | avpriv_set_pts_info(video_st, 64, 1, 1000000); | |
| 56 | |||
| 57 | 1 | audio_st = avformat_new_stream(s, NULL); | |
| 58 |
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1 | if (!audio_st) |
| 59 | ✗ | return AVERROR(ENOMEM); | |
| 60 | 1 | audio_st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; | |
| 61 | 1 | audio_st->codecpar->codec_id = AV_CODEC_ID_PCM_ALAW; | |
| 62 | 1 | audio_st->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO; | |
| 63 | 1 | audio_st->codecpar->sample_rate = 8000; | |
| 64 | 1 | audio_st->codecpar->bits_per_coded_sample = 8; | |
| 65 | 1 | audio_st->codecpar->block_align = 1; | |
| 66 | 1 | avpriv_set_pts_info(audio_st, 64, 1, 1000000); | |
| 67 | |||
| 68 | 1 | mxg->soi_ptr = mxg->buffer_ptr = mxg->buffer = 0; | |
| 69 | 1 | mxg->buffer_size = 0; | |
| 70 | 1 | mxg->dts = AV_NOPTS_VALUE; | |
| 71 | 1 | mxg->cache_size = 0; | |
| 72 | |||
| 73 | 1 | return 0; | |
| 74 | } | ||
| 75 | |||
| 76 | 8365 | static uint8_t* mxg_find_startmarker(uint8_t *p, uint8_t *end) | |
| 77 | { | ||
| 78 |
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139149 | for (; p < end - 3; p += 4) { |
| 79 | 138625 | uint32_t x = AV_RN32(p); | |
| 80 | |||
| 81 |
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138625 | if (x & (~(x+0x01010101)) & 0x80808080) { |
| 82 |
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7841 | if (p[0] == 0xff) { |
| 83 | 1627 | return p; | |
| 84 |
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6214 | } else if (p[1] == 0xff) { |
| 85 | 1718 | return p+1; | |
| 86 |
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4496 | } else if (p[2] == 0xff) { |
| 87 | 2815 | return p+2; | |
| 88 |
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1681 | } else if (p[3] == 0xff) { |
| 89 | 1681 | return p+3; | |
| 90 | } | ||
| 91 | } | ||
| 92 | } | ||
| 93 | |||
| 94 |
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1274 | for (; p < end; ++p) { |
| 95 |
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763 | if (*p == 0xff) return p; |
| 96 | } | ||
| 97 | |||
| 98 | 511 | return end; | |
| 99 | } | ||
| 100 | |||
| 101 | 590 | static int mxg_update_cache(AVFormatContext *s, unsigned int cache_size) | |
| 102 | { | ||
| 103 | 590 | MXGContext *mxg = s->priv_data; | |
| 104 | 590 | unsigned int current_pos = mxg->buffer_ptr - mxg->buffer; | |
| 105 | unsigned int soi_pos; | ||
| 106 | uint8_t *buffer; | ||
| 107 | int ret; | ||
| 108 | |||
| 109 | /* reallocate internal buffer */ | ||
| 110 |
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590 | if (current_pos > current_pos + cache_size) |
| 111 | ✗ | return AVERROR(ENOMEM); | |
| 112 | 590 | soi_pos = mxg->soi_ptr - mxg->buffer; | |
| 113 | 590 | buffer = av_fast_realloc(mxg->buffer, &mxg->buffer_size, | |
| 114 | 590 | current_pos + cache_size + | |
| 115 | AV_INPUT_BUFFER_PADDING_SIZE); | ||
| 116 |
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590 | if (!buffer) |
| 117 | ✗ | return AVERROR(ENOMEM); | |
| 118 | 590 | mxg->buffer = buffer; | |
| 119 | 590 | mxg->buffer_ptr = mxg->buffer + current_pos; | |
| 120 |
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590 | if (mxg->soi_ptr) mxg->soi_ptr = mxg->buffer + soi_pos; |
| 121 | |||
| 122 | /* get data */ | ||
| 123 | 590 | ret = avio_read(s->pb, mxg->buffer_ptr + mxg->cache_size, | |
| 124 | 590 | cache_size - mxg->cache_size); | |
| 125 |
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590 | if (ret < 0) |
| 126 | ✗ | return ret; | |
| 127 | |||
| 128 | 590 | mxg->cache_size += ret; | |
| 129 | |||
| 130 | 590 | memset(mxg->buffer_ptr + mxg->cache_size, 0, AV_INPUT_BUFFER_PADDING_SIZE); | |
| 131 | |||
| 132 | 590 | return ret; | |
| 133 | } | ||
| 134 | |||
| 135 | 32 | static int mxg_read_packet(AVFormatContext *s, AVPacket *pkt) | |
| 136 | { | ||
| 137 | int ret; | ||
| 138 | unsigned int size; | ||
| 139 | uint8_t *startmarker_ptr, *end, *search_end, marker; | ||
| 140 | 32 | MXGContext *mxg = s->priv_data; | |
| 141 | |||
| 142 |
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8366 | while (!avio_feof(s->pb) && !s->pb->error){ |
| 143 |
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8365 | if (mxg->cache_size <= OVERREAD_SIZE) { |
| 144 | /* update internal buffer */ | ||
| 145 | 560 | ret = mxg_update_cache(s, DEFAULT_PACKET_SIZE + OVERREAD_SIZE); | |
| 146 |
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560 | if (ret < 0) |
| 147 | ✗ | return ret; | |
| 148 | } | ||
| 149 | 8365 | end = mxg->buffer_ptr + mxg->cache_size; | |
| 150 | |||
| 151 | /* find start marker - 0xff */ | ||
| 152 |
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8365 | if (mxg->cache_size > OVERREAD_SIZE) { |
| 153 | 8365 | search_end = end - OVERREAD_SIZE; | |
| 154 | 8365 | startmarker_ptr = mxg_find_startmarker(mxg->buffer_ptr, search_end); | |
| 155 | } else { | ||
| 156 | ✗ | search_end = end; | |
| 157 | ✗ | startmarker_ptr = mxg_find_startmarker(mxg->buffer_ptr, search_end); | |
| 158 | ✗ | if (startmarker_ptr >= search_end - 1 || | |
| 159 | ✗ | *(startmarker_ptr + 1) != EOI) break; | |
| 160 | } | ||
| 161 | |||
| 162 |
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8365 | if (startmarker_ptr != search_end) { /* start marker found */ |
| 163 | 7854 | marker = *(startmarker_ptr + 1); | |
| 164 | 7854 | mxg->buffer_ptr = startmarker_ptr + 2; | |
| 165 | 7854 | mxg->cache_size = end - mxg->buffer_ptr; | |
| 166 | |||
| 167 |
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7854 | if (marker == SOI) { |
| 168 | 31 | mxg->soi_ptr = startmarker_ptr; | |
| 169 |
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7823 | } else if (marker == EOI) { |
| 170 |
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30 | if (!mxg->soi_ptr) { |
| 171 | ✗ | av_log(s, AV_LOG_WARNING, "Found EOI before SOI, skipping\n"); | |
| 172 | ✗ | continue; | |
| 173 | } | ||
| 174 | |||
| 175 | 30 | size = mxg->buffer_ptr - mxg->soi_ptr; | |
| 176 | 30 | ret = av_new_packet(pkt, size); | |
| 177 |
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30 | if (ret < 0) |
| 178 | ✗ | return ret; | |
| 179 | 30 | memcpy(pkt->data, mxg->soi_ptr, size); | |
| 180 | |||
| 181 | 30 | pkt->pts = pkt->dts = mxg->dts; | |
| 182 | 30 | pkt->stream_index = 0; | |
| 183 | |||
| 184 |
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30 | if (mxg->soi_ptr - mxg->buffer > mxg->cache_size) { |
| 185 |
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14 | if (mxg->cache_size > 0) { |
| 186 | 14 | memmove(mxg->buffer, mxg->buffer_ptr, mxg->cache_size); | |
| 187 | } | ||
| 188 | |||
| 189 | 14 | mxg->buffer_ptr = mxg->buffer; | |
| 190 | } | ||
| 191 | 30 | mxg->soi_ptr = 0; | |
| 192 | |||
| 193 | 30 | return pkt->size; | |
| 194 |
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7793 | } else if ( (SOF0 <= marker && marker <= SOF15) || |
| 195 |
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128 | (SOS <= marker && marker <= COM) ) { |
| 196 | /* all other markers that start marker segment also contain | ||
| 197 | length value (see specification for JPEG Annex B.1) */ | ||
| 198 | 133 | size = AV_RB16(mxg->buffer_ptr); | |
| 199 |
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133 | if (size < 2) |
| 200 | ✗ | return AVERROR(EINVAL); | |
| 201 | |||
| 202 |
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133 | if (mxg->cache_size < size) { |
| 203 | 30 | ret = mxg_update_cache(s, size); | |
| 204 |
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30 | if (ret < 0) |
| 205 | ✗ | return ret; | |
| 206 | 30 | startmarker_ptr = mxg->buffer_ptr - 2; | |
| 207 | 30 | mxg->cache_size = 0; | |
| 208 | } else { | ||
| 209 | 103 | mxg->cache_size -= size; | |
| 210 | } | ||
| 211 | |||
| 212 | 133 | mxg->buffer_ptr += size; | |
| 213 | |||
| 214 |
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133 | if (marker == APP13 && size >= 16) { /* audio data */ |
| 215 | 1 | ret = av_new_packet(pkt, size - 14); | |
| 216 |
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1 | if (ret < 0) |
| 217 | ✗ | return ret; | |
| 218 | 1 | memcpy(pkt->data, startmarker_ptr + 16, size - 14); | |
| 219 | |||
| 220 | /* time (GMT) of first sample in usec since 1970, little-endian */ | ||
| 221 | 1 | pkt->pts = pkt->dts = AV_RL64(startmarker_ptr + 8); | |
| 222 | 1 | pkt->stream_index = 1; | |
| 223 | |||
| 224 |
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1 | if (startmarker_ptr - mxg->buffer > mxg->cache_size) { |
| 225 |
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1 | if (mxg->cache_size > 0) { |
| 226 | ✗ | memcpy(mxg->buffer, mxg->buffer_ptr, mxg->cache_size); | |
| 227 | } | ||
| 228 | 1 | mxg->buffer_ptr = mxg->buffer; | |
| 229 | } | ||
| 230 | |||
| 231 | 1 | return pkt->size; | |
| 232 |
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132 | } else if (marker == COM && size >= 18 && |
| 233 |
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63 | !strncmp(startmarker_ptr + 4, "MXF", 3)) { |
| 234 | /* time (GMT) of video frame in usec since 1970, little-endian */ | ||
| 235 | 31 | mxg->dts = AV_RL64(startmarker_ptr + 12); | |
| 236 | } | ||
| 237 | } | ||
| 238 | } else { | ||
| 239 | /* start marker not found */ | ||
| 240 | 511 | mxg->buffer_ptr = search_end; | |
| 241 | 511 | mxg->cache_size = OVERREAD_SIZE; | |
| 242 | } | ||
| 243 | } | ||
| 244 | |||
| 245 | 1 | return AVERROR_EOF; | |
| 246 | } | ||
| 247 | |||
| 248 | 1 | static int mxg_close(struct AVFormatContext *s) | |
| 249 | { | ||
| 250 | 1 | MXGContext *mxg = s->priv_data; | |
| 251 | 1 | av_freep(&mxg->buffer); | |
| 252 | 1 | return 0; | |
| 253 | } | ||
| 254 | |||
| 255 | const FFInputFormat ff_mxg_demuxer = { | ||
| 256 | .p.name = "mxg", | ||
| 257 | .p.long_name = NULL_IF_CONFIG_SMALL("MxPEG clip"), | ||
| 258 | .p.extensions = "mxg", | ||
| 259 | .priv_data_size = sizeof(MXGContext), | ||
| 260 | .read_header = mxg_read_header, | ||
| 261 | .read_packet = mxg_read_packet, | ||
| 262 | .read_close = mxg_close, | ||
| 263 | }; | ||
| 264 |