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4349 | Serge | 1 | /* |
2 | * RAW HEVC video demuxer |
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3 | * Copyright (c) 2013 Dirk Farin |
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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 "avformat.h" |
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23 | #include "rawdec.h" |
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24 | |||
25 | #include "libavcodec/hevc.h" |
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26 | |||
27 | static int hevc_probe(AVProbeData *p) |
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28 | { |
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29 | uint32_t code = -1; |
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30 | int vps = 0, sps = 0, pps = 0, irap = 0; |
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31 | int i; |
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32 | |||
33 | for (i = 0; i < p->buf_size - 1; i++) { |
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34 | code = (code << 8) + p->buf[i]; |
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35 | if ((code & 0xffffff00) == 0x100) { |
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36 | uint8_t nal2 = p->buf[i + 1]; |
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37 | int type = (code & 0x7E) >> 1; |
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38 | |||
39 | if (code & 0x81) // forbidden and reserved zero bits |
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40 | return 0; |
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41 | |||
42 | if (nal2 & 0xf8) // reserved zero |
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43 | return 0; |
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44 | |||
45 | switch (type) { |
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46 | case NAL_VPS: vps++; break; |
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47 | case NAL_SPS: sps++; break; |
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48 | case NAL_PPS: pps++; break; |
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49 | case NAL_BLA_N_LP: |
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50 | case NAL_BLA_W_LP: |
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51 | case NAL_BLA_W_RADL: |
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52 | case NAL_CRA_NUT: |
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53 | case NAL_IDR_N_LP: |
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54 | case NAL_IDR_W_RADL: irap++; break; |
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55 | } |
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56 | } |
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57 | } |
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58 | |||
59 | // printf("vps=%d, sps=%d, pps=%d, irap=%d\n", vps, sps, pps, irap); |
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60 | |||
61 | if (vps && sps && pps && irap) |
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62 | return AVPROBE_SCORE_EXTENSION + 1; // 1 more than .mpg |
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63 | return 0; |
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64 | } |
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65 | |||
66 | FF_DEF_RAWVIDEO_DEMUXER(hevc, "raw HEVC video", hevc_probe, "hevc,h265,265", AV_CODEC_ID_HEVC)><>> |