| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * MJPEG A dump header bitstream filter | ||
| 3 | * Copyright (c) 2006 Baptiste Coudurier | ||
| 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 | /** | ||
| 23 | * @file | ||
| 24 | * MJPEG A dump header bitstream filter | ||
| 25 | * modifies bitstream to be decoded by quicktime | ||
| 26 | */ | ||
| 27 | |||
| 28 | #include "bsf.h" | ||
| 29 | #include "bsf_internal.h" | ||
| 30 | #include "bytestream.h" | ||
| 31 | #include "mjpeg.h" | ||
| 32 | |||
| 33 | |||
| 34 | ✗ | static int mjpega_dump_header(AVBSFContext *ctx, AVPacket *out) | |
| 35 | { | ||
| 36 | AVPacket *in; | ||
| 37 | uint8_t *out_buf; | ||
| 38 | ✗ | unsigned dqt = 0, dht = 0, sof0 = 0; | |
| 39 | ✗ | int ret = 0, i; | |
| 40 | |||
| 41 | ✗ | ret = ff_bsf_get_packet(ctx, &in); | |
| 42 | ✗ | if (ret < 0) | |
| 43 | ✗ | return ret; | |
| 44 | |||
| 45 | ✗ | ret = av_new_packet(out, in->size + 44); | |
| 46 | ✗ | if (ret < 0) | |
| 47 | ✗ | goto fail; | |
| 48 | |||
| 49 | ✗ | ret = av_packet_copy_props(out, in); | |
| 50 | ✗ | if (ret < 0) | |
| 51 | ✗ | goto fail; | |
| 52 | |||
| 53 | ✗ | out_buf = out->data; | |
| 54 | ✗ | bytestream_put_byte(&out_buf, 0xff); | |
| 55 | ✗ | bytestream_put_byte(&out_buf, SOI); | |
| 56 | ✗ | bytestream_put_byte(&out_buf, 0xff); | |
| 57 | ✗ | bytestream_put_byte(&out_buf, APP1); | |
| 58 | ✗ | bytestream_put_be16(&out_buf, 42); /* size */ | |
| 59 | ✗ | bytestream_put_be32(&out_buf, 0); | |
| 60 | ✗ | bytestream_put_buffer(&out_buf, "mjpg", 4); | |
| 61 | ✗ | bytestream_put_be32(&out_buf, in->size + 44); /* field size */ | |
| 62 | ✗ | bytestream_put_be32(&out_buf, in->size + 44); /* pad field size */ | |
| 63 | ✗ | bytestream_put_be32(&out_buf, 0); /* next ptr */ | |
| 64 | |||
| 65 | ✗ | for (i = 0; i < in->size - 1; i++) { | |
| 66 | ✗ | if (in->data[i] == 0xff) { | |
| 67 | ✗ | switch (in->data[i + 1]) { | |
| 68 | ✗ | case DQT: dqt = i + 46; break; | |
| 69 | ✗ | case DHT: dht = i + 46; break; | |
| 70 | ✗ | case SOF0: sof0 = i + 46; break; | |
| 71 | ✗ | case SOS: | |
| 72 | ✗ | bytestream_put_be32(&out_buf, dqt); /* quant off */ | |
| 73 | ✗ | bytestream_put_be32(&out_buf, dht); /* huff off */ | |
| 74 | ✗ | bytestream_put_be32(&out_buf, sof0); /* image off */ | |
| 75 | ✗ | bytestream_put_be32(&out_buf, i + 46); /* scan off */ | |
| 76 | ✗ | bytestream_put_be32(&out_buf, i + 46 + AV_RB16(in->data + i + 2)); /* data off */ | |
| 77 | ✗ | bytestream_put_buffer(&out_buf, in->data + 2, in->size - 2); /* skip already written SOI */ | |
| 78 | |||
| 79 | ✗ | out->size = out_buf - out->data; | |
| 80 | ✗ | av_packet_free(&in); | |
| 81 | ✗ | return 0; | |
| 82 | ✗ | case APP1: | |
| 83 | ✗ | if (i + 8 < in->size && AV_RL32(in->data + i + 8) == AV_RL32("mjpg")) { | |
| 84 | ✗ | av_log(ctx, AV_LOG_ERROR, "bitstream already formatted\n"); | |
| 85 | ✗ | av_packet_unref(out); | |
| 86 | ✗ | av_packet_move_ref(out, in); | |
| 87 | ✗ | av_packet_free(&in); | |
| 88 | ✗ | return 0; | |
| 89 | } | ||
| 90 | } | ||
| 91 | } | ||
| 92 | } | ||
| 93 | ✗ | av_log(ctx, AV_LOG_ERROR, "could not find SOS marker in bitstream\n"); | |
| 94 | ✗ | fail: | |
| 95 | ✗ | av_packet_unref(out); | |
| 96 | ✗ | av_packet_free(&in); | |
| 97 | ✗ | return AVERROR_INVALIDDATA; | |
| 98 | } | ||
| 99 | |||
| 100 | static const enum AVCodecID codec_ids[] = { | ||
| 101 | AV_CODEC_ID_MJPEG, AV_CODEC_ID_NONE, | ||
| 102 | }; | ||
| 103 | |||
| 104 | const FFBitStreamFilter ff_mjpega_dump_header_bsf = { | ||
| 105 | .p.name = "mjpegadump", | ||
| 106 | .p.codec_ids = codec_ids, | ||
| 107 | .filter = mjpega_dump_header, | ||
| 108 | }; | ||
| 109 |