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  1. /*
  2. * LXF demuxer
  3. * Copyright (c) 2010 Tomas Härdin
  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. #include "libavutil/intreadwrite.h"
  22. #include "avformat.h"
  23. #include "internal.h"
  24. #include "riff.h"
  25. #define LXF_PACKET_HEADER_SIZE 60
  26. #define LXF_HEADER_DATA_SIZE 120
  27. #define LXF_IDENT "LEITCH\0"
  28. #define LXF_IDENT_LENGTH 8
  29. #define LXF_SAMPLERATE 48000
  30. #define LXF_MAX_AUDIO_PACKET (8008*15*4) ///< 15-channel 32-bit NTSC audio frame
  31. static const AVCodecTag lxf_tags[] = {
  32. { CODEC_ID_MJPEG, 0 },
  33. { CODEC_ID_MPEG1VIDEO, 1 },
  34. { CODEC_ID_MPEG2VIDEO, 2 }, //MpMl, 4:2:0
  35. { CODEC_ID_MPEG2VIDEO, 3 }, //MpPl, 4:2:2
  36. { CODEC_ID_DVVIDEO, 4 }, //DV25
  37. { CODEC_ID_DVVIDEO, 5 }, //DVCPRO
  38. { CODEC_ID_DVVIDEO, 6 }, //DVCPRO50
  39. { CODEC_ID_RAWVIDEO, 7 }, //PIX_FMT_ARGB, where alpha is used for chroma keying
  40. { CODEC_ID_RAWVIDEO, 8 }, //16-bit chroma key
  41. { CODEC_ID_MPEG2VIDEO, 9 }, //4:2:2 CBP ("Constrained Bytes per Gop")
  42. { CODEC_ID_NONE, 0 },
  43. };
  44. typedef struct {
  45. int channels; ///< number of audio channels. zero means no audio
  46. uint8_t temp[LXF_MAX_AUDIO_PACKET]; ///< temp buffer for de-planarizing the audio data
  47. int frame_number; ///< current video frame
  48. } LXFDemuxContext;
  49. static int lxf_probe(AVProbeData *p)
  50. {
  51. if (!memcmp(p->buf, LXF_IDENT, LXF_IDENT_LENGTH))
  52. return AVPROBE_SCORE_MAX;
  53. return 0;
  54. }
  55. /**
  56. * Verify the checksum of an LXF packet header
  57. *
  58. * @param[in] header the packet header to check
  59. * @return zero if the checksum is OK, non-zero otherwise
  60. */
  61. static int check_checksum(const uint8_t *header)
  62. {
  63. int x;
  64. uint32_t sum = 0;
  65. for (x = 0; x < LXF_PACKET_HEADER_SIZE; x += 4)
  66. sum += AV_RL32(&header[x]);
  67. return sum;
  68. }
  69. /**
  70. * Read input until we find the next ident. If found, copy it to the header buffer
  71. *
  72. * @param[out] header where to copy the ident to
  73. * @return 0 if an ident was found, < 0 on I/O error
  74. */
  75. static int sync(AVFormatContext *s, uint8_t *header)
  76. {
  77. uint8_t buf[LXF_IDENT_LENGTH];
  78. int ret;
  79. if ((ret = avio_read(s->pb, buf, LXF_IDENT_LENGTH)) != LXF_IDENT_LENGTH)
  80. return ret < 0 ? ret : AVERROR_EOF;
  81. while (memcmp(buf, LXF_IDENT, LXF_IDENT_LENGTH)) {
  82. if (url_feof(s->pb))
  83. return AVERROR_EOF;
  84. memmove(buf, &buf[1], LXF_IDENT_LENGTH-1);
  85. buf[LXF_IDENT_LENGTH-1] = avio_r8(s->pb);
  86. }
  87. memcpy(header, LXF_IDENT, LXF_IDENT_LENGTH);
  88. return 0;
  89. }
  90. /**
  91. * Read and checksum the next packet header
  92. *
  93. * @param[out] header the read packet header
  94. * @param[out] format context dependent format information
  95. * @return the size of the payload following the header or < 0 on failure
  96. */
  97. static int get_packet_header(AVFormatContext *s, uint8_t *header, uint32_t *format)
  98. {
  99. AVIOContext *pb = s->pb;
  100. int track_size, samples, ret;
  101. AVStream *st;
  102. //find and read the ident
  103. if ((ret = sync(s, header)) < 0)
  104. return ret;
  105. //read the rest of the packet header
  106. if ((ret = avio_read(pb, header + LXF_IDENT_LENGTH,
  107. LXF_PACKET_HEADER_SIZE - LXF_IDENT_LENGTH)) !=
  108. LXF_PACKET_HEADER_SIZE - LXF_IDENT_LENGTH) {
  109. return ret < 0 ? ret : AVERROR_EOF;
  110. }
  111. if (check_checksum(header))
  112. av_log(s, AV_LOG_ERROR, "checksum error\n");
  113. *format = AV_RL32(&header[32]);
  114. ret = AV_RL32(&header[36]);
  115. //type
  116. switch (AV_RL32(&header[16])) {
  117. case 0:
  118. //video
  119. //skip VBI data and metadata
  120. avio_skip(pb, (int64_t)(uint32_t)AV_RL32(&header[44]) +
  121. (int64_t)(uint32_t)AV_RL32(&header[52]));
  122. break;
  123. case 1:
  124. //audio
  125. if (!(st = s->streams[1])) {
  126. av_log(s, AV_LOG_INFO, "got audio packet, but no audio stream present\n");
  127. break;
  128. }
  129. //set codec based on specified audio bitdepth
  130. //we only support tightly packed 16-, 20-, 24- and 32-bit PCM at the moment
  131. *format = AV_RL32(&header[40]);
  132. st->codec->bits_per_coded_sample = (*format >> 6) & 0x3F;
  133. if (st->codec->bits_per_coded_sample != (*format & 0x3F)) {
  134. av_log(s, AV_LOG_WARNING, "only tightly packed PCM currently supported\n");
  135. return AVERROR_PATCHWELCOME;
  136. }
  137. switch (st->codec->bits_per_coded_sample) {
  138. case 16: st->codec->codec_id = CODEC_ID_PCM_S16LE; break;
  139. case 20: st->codec->codec_id = CODEC_ID_PCM_LXF; break;
  140. case 24: st->codec->codec_id = CODEC_ID_PCM_S24LE; break;
  141. case 32: st->codec->codec_id = CODEC_ID_PCM_S32LE; break;
  142. default:
  143. av_log(s, AV_LOG_WARNING,
  144. "only 16-, 20-, 24- and 32-bit PCM currently supported\n");
  145. return AVERROR_PATCHWELCOME;
  146. }
  147. track_size = AV_RL32(&header[48]);
  148. samples = track_size * 8 / st->codec->bits_per_coded_sample;
  149. //use audio packet size to determine video standard
  150. //for NTSC we have one 8008-sample audio frame per five video frames
  151. if (samples == LXF_SAMPLERATE * 5005 / 30000) {
  152. avpriv_set_pts_info(s->streams[0], 64, 1001, 30000);
  153. } else {
  154. //assume PAL, but warn if we don't have 1920 samples
  155. if (samples != LXF_SAMPLERATE / 25)
  156. av_log(s, AV_LOG_WARNING,
  157. "video doesn't seem to be PAL or NTSC. guessing PAL\n");
  158. avpriv_set_pts_info(s->streams[0], 64, 1, 25);
  159. }
  160. //TODO: warning if track mask != (1 << channels) - 1?
  161. ret = av_popcount(AV_RL32(&header[44])) * track_size;
  162. break;
  163. default:
  164. break;
  165. }
  166. return ret;
  167. }
  168. static int lxf_read_header(AVFormatContext *s, AVFormatParameters *ap)
  169. {
  170. LXFDemuxContext *lxf = s->priv_data;
  171. AVIOContext *pb = s->pb;
  172. uint8_t header[LXF_PACKET_HEADER_SIZE], header_data[LXF_HEADER_DATA_SIZE];
  173. int ret;
  174. AVStream *st;
  175. uint32_t format, video_params, disk_params;
  176. uint16_t record_date, expiration_date;
  177. if ((ret = get_packet_header(s, header, &format)) < 0)
  178. return ret;
  179. if (ret != LXF_HEADER_DATA_SIZE) {
  180. av_log(s, AV_LOG_ERROR, "expected %d B size header, got %d\n",
  181. LXF_HEADER_DATA_SIZE, ret);
  182. return AVERROR_INVALIDDATA;
  183. }
  184. if ((ret = avio_read(pb, header_data, LXF_HEADER_DATA_SIZE)) != LXF_HEADER_DATA_SIZE)
  185. return ret < 0 ? ret : AVERROR_EOF;
  186. if (!(st = avformat_new_stream(s, NULL)))
  187. return AVERROR(ENOMEM);
  188. st->duration = AV_RL32(&header_data[32]);
  189. video_params = AV_RL32(&header_data[40]);
  190. record_date = AV_RL16(&header_data[56]);
  191. expiration_date = AV_RL16(&header_data[58]);
  192. disk_params = AV_RL32(&header_data[116]);
  193. st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
  194. st->codec->bit_rate = 1000000 * ((video_params >> 14) & 0xFF);
  195. st->codec->codec_tag = video_params & 0xF;
  196. st->codec->codec_id = ff_codec_get_id(lxf_tags, st->codec->codec_tag);
  197. av_log(s, AV_LOG_DEBUG, "record: %x = %i-%02i-%02i\n",
  198. record_date, 1900 + (record_date & 0x7F), (record_date >> 7) & 0xF,
  199. (record_date >> 11) & 0x1F);
  200. av_log(s, AV_LOG_DEBUG, "expire: %x = %i-%02i-%02i\n",
  201. expiration_date, 1900 + (expiration_date & 0x7F), (expiration_date >> 7) & 0xF,
  202. (expiration_date >> 11) & 0x1F);
  203. if ((video_params >> 22) & 1)
  204. av_log(s, AV_LOG_WARNING, "VBI data not yet supported\n");
  205. if ((lxf->channels = (disk_params >> 2) & 0xF)) {
  206. if (!(st = avformat_new_stream(s, NULL)))
  207. return AVERROR(ENOMEM);
  208. st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
  209. st->codec->sample_rate = LXF_SAMPLERATE;
  210. st->codec->channels = lxf->channels;
  211. avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
  212. }
  213. if (format == 1) {
  214. //skip extended field data
  215. avio_skip(s->pb, (uint32_t)AV_RL32(&header[40]));
  216. }
  217. return 0;
  218. }
  219. /**
  220. * De-planerize the PCM data in lxf->temp
  221. * FIXME: remove this once support for planar audio is added to libavcodec
  222. *
  223. * @param[out] out where to write the de-planerized data to
  224. * @param[in] bytes the total size of the PCM data
  225. */
  226. static void deplanarize(LXFDemuxContext *lxf, AVStream *ast, uint8_t *out, int bytes)
  227. {
  228. int x, y, z, i, bytes_per_sample = ast->codec->bits_per_coded_sample >> 3;
  229. for (z = i = 0; z < lxf->channels; z++)
  230. for (y = 0; y < bytes / bytes_per_sample / lxf->channels; y++)
  231. for (x = 0; x < bytes_per_sample; x++, i++)
  232. out[x + bytes_per_sample*(z + y*lxf->channels)] = lxf->temp[i];
  233. }
  234. static int lxf_read_packet(AVFormatContext *s, AVPacket *pkt)
  235. {
  236. LXFDemuxContext *lxf = s->priv_data;
  237. AVIOContext *pb = s->pb;
  238. uint8_t header[LXF_PACKET_HEADER_SIZE], *buf;
  239. AVStream *ast = NULL;
  240. uint32_t stream, format;
  241. int ret, ret2;
  242. if ((ret = get_packet_header(s, header, &format)) < 0)
  243. return ret;
  244. stream = AV_RL32(&header[16]);
  245. if (stream > 1) {
  246. av_log(s, AV_LOG_WARNING, "got packet with illegal stream index %u\n", stream);
  247. return AVERROR(EAGAIN);
  248. }
  249. if (stream == 1 && !(ast = s->streams[1])) {
  250. av_log(s, AV_LOG_ERROR, "got audio packet without having an audio stream\n");
  251. return AVERROR_INVALIDDATA;
  252. }
  253. //make sure the data fits in the de-planerization buffer
  254. if (ast && ret > LXF_MAX_AUDIO_PACKET) {
  255. av_log(s, AV_LOG_ERROR, "audio packet too large (%i > %i)\n",
  256. ret, LXF_MAX_AUDIO_PACKET);
  257. return AVERROR_INVALIDDATA;
  258. }
  259. if ((ret2 = av_new_packet(pkt, ret)) < 0)
  260. return ret2;
  261. //read non-20-bit audio data into lxf->temp so we can deplanarize it
  262. buf = ast && ast->codec->codec_id != CODEC_ID_PCM_LXF ? lxf->temp : pkt->data;
  263. if ((ret2 = avio_read(pb, buf, ret)) != ret) {
  264. av_free_packet(pkt);
  265. return ret2 < 0 ? ret2 : AVERROR_EOF;
  266. }
  267. pkt->stream_index = stream;
  268. if (ast) {
  269. if(ast->codec->codec_id != CODEC_ID_PCM_LXF)
  270. deplanarize(lxf, ast, pkt->data, ret);
  271. } else {
  272. //picture type (0 = closed I, 1 = open I, 2 = P, 3 = B)
  273. if (((format >> 22) & 0x3) < 2)
  274. pkt->flags |= AV_PKT_FLAG_KEY;
  275. pkt->dts = lxf->frame_number++;
  276. }
  277. return ret;
  278. }
  279. AVInputFormat ff_lxf_demuxer = {
  280. .name = "lxf",
  281. .long_name = NULL_IF_CONFIG_SMALL("VR native stream format (LXF)"),
  282. .priv_data_size = sizeof(LXFDemuxContext),
  283. .read_probe = lxf_probe,
  284. .read_header = lxf_read_header,
  285. .read_packet = lxf_read_packet,
  286. .codec_tag = (const AVCodecTag* const []){lxf_tags, 0},
  287. };