From cc0bc648f0e0ae63ce181dda7b4f98404c0061df Mon Sep 17 00:00:00 2001 From: Reimar Döffinger Date: Mon, 3 Jul 2006 16:32:57 +0000 Subject: add GXF demuxer Originally committed as revision 5598 to svn://svn.ffmpeg.org/ffmpeg/trunk --- libavformat/gxf.c | 259 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 259 insertions(+) create mode 100644 libavformat/gxf.c (limited to 'libavformat/gxf.c') diff --git a/libavformat/gxf.c b/libavformat/gxf.c new file mode 100644 index 0000000000..3056e35d5a --- /dev/null +++ b/libavformat/gxf.c @@ -0,0 +1,259 @@ +/* + * GXF demuxer. + * Copyright (c) 2006 Reimar Doeffinger. + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ +#include "avformat.h" +#include "avi.h" + +typedef enum { + PKT_MAP = 0xbc, + PKT_MEDIA = 0xbf, + PKT_EOS = 0xfb, + PKT_FLT = 0xfc, + PKT_UMF = 0xfd +} pkt_type_t; + +/** + * \brief parses a packet header, extracting type and length + * \param pb ByteIOContext to read header from + * \param type detected packet type is stored here + * \param length detected packet length, excluding header is stored here + * \return 0 if header not found or contains invalid data, 1 otherwise + */ +static int parse_packet_header(ByteIOContext *pb, pkt_type_t *type, int *length) { + if (get_be32(pb)) + return 0; + if (get_byte(pb) != 1) + return 0; + *type = get_byte(pb); + *length = get_be32(pb); + if ((*length >> 24) || *length < 16) + return 0; + *length -= 16; + if (get_be32(pb)) + return 0; + if (get_byte(pb) != 0xe1) + return 0; + if (get_byte(pb) != 0xe2) + return 0; + return 1; +} + +/** + * \brief check if file starts with a PKT_MAP header + */ +static int gxf_probe(AVProbeData *p) { + static const uint8_t startcode[] = {0, 0, 0, 0, 1, 0xbc}; // start with map packet + static const uint8_t endcode[] = {0, 0, 0, 0, 0xe1, 0xe2}; + if (p->buf_size < 16) + return 0; + if (!memcmp(p->buf, startcode, sizeof(startcode)) && + !memcmp(&p->buf[16 - sizeof(endcode)], endcode, sizeof(endcode))) + return AVPROBE_SCORE_MAX; + return 0; +} + +/** + * \brief gets the stream index for the track with the specified id, creates new + * stream if not found + * \param stream id of stream to find / add + * \param format stream format identifier + */ +static int get_sindex(AVFormatContext *s, int id, int format) { + int i; + AVStream *st = NULL; + for (i = 0; i < s->nb_streams; i++) { + if (s->streams[i]->id == id) + return i; + } + st = av_new_stream(s, id); + switch (format) { + case 3: + case 4: + st->codec->codec_type = CODEC_TYPE_VIDEO; + st->codec->codec_id = CODEC_ID_MJPEG; + st->codec->codec_tag = MKTAG('M', 'J', 'P', 'G'); + break; + case 13: + case 15: + st->codec->codec_type = CODEC_TYPE_VIDEO; + st->codec->codec_id = CODEC_ID_DVVIDEO; + st->codec->codec_tag = MKTAG('d', 'v', 'c', ' '); + break; + case 14: + case 16: + st->codec->codec_type = CODEC_TYPE_VIDEO; + st->codec->codec_id = CODEC_ID_DVVIDEO; + st->codec->codec_tag = MKTAG('d', 'v', 'c', 'p'); + break; + case 11: + case 12: + case 20: + st->codec->codec_type = CODEC_TYPE_VIDEO; + st->codec->codec_id = CODEC_ID_MPEG2VIDEO; + st->codec->codec_tag = MKTAG('M', 'P', 'G', '2'); + break; + case 22: + case 23: + st->codec->codec_type = CODEC_TYPE_VIDEO; + st->codec->codec_id = CODEC_ID_MPEG1VIDEO; + st->codec->codec_tag = MKTAG('M', 'P', 'G', '1'); + break; + case 9: + st->codec->codec_type = CODEC_TYPE_AUDIO; + st->codec->codec_id = CODEC_ID_PCM_S24LE; + st->codec->codec_tag = 0x1; + st->codec->channels = 1; + st->codec->sample_rate = 48000; + st->codec->bit_rate = 3 * 1 * 48000 * 8; + st->codec->block_align = 3 * 1; + st->codec->bits_per_sample = 24; + break; + case 10: + st->codec->codec_type = CODEC_TYPE_AUDIO; + st->codec->codec_id = CODEC_ID_PCM_S16LE; + st->codec->codec_tag = 0x1; + st->codec->channels = 1; + st->codec->sample_rate = 48000; + st->codec->bit_rate = 2 * 1 * 48000 * 8; + st->codec->block_align = 2 * 1; + st->codec->bits_per_sample = 16; + break; + case 17: + st->codec->codec_type = CODEC_TYPE_AUDIO; + st->codec->codec_id = CODEC_ID_AC3; + st->codec->codec_tag = 0x2000; + st->codec->channels = 2; + st->codec->sample_rate = 48000; + break; + default: + st->codec->codec_type = CODEC_TYPE_UNKNOWN; + st->codec->codec_id = CODEC_ID_NONE; + break; + } + return s->nb_streams - 1; +} + +static int gxf_header(AVFormatContext *s, AVFormatParameters *ap) { + ByteIOContext *pb = &s->pb; + pkt_type_t pkt_type; + int map_len; + int len; + if (!parse_packet_header(pb, &pkt_type, &map_len) || pkt_type != PKT_MAP) { + av_log(s, AV_LOG_ERROR, "GXF: map packet not found\n"); + return 0; + } + map_len -= 2; + if (get_byte(pb) != 0x0e0 || get_byte(pb) != 0xff) { + av_log(s, AV_LOG_ERROR, "GXF: unknown version or invalid map preamble\n"); + return 0; + } + map_len -= 2; + len = get_be16(pb); // length of material data section + if (len > map_len) { + av_log(s, AV_LOG_ERROR, "GXF: material data longer than map data\n"); + return 0; + } + map_len -= len; + url_fskip(pb, len); + map_len -= 2; + len = get_be16(pb); // length of track description + if (len > map_len) { + av_log(s, AV_LOG_ERROR, "GXF: track description longer than map data\n"); + return 0; + } + map_len -= len; + while (len > 0) { + int track_type, track_id, track_len; + len -= 4; + track_type = get_byte(pb); + track_id = get_byte(pb); + track_len = get_be16(pb); + len -= track_len; + url_fskip(pb, track_len); + if (!(track_type & 0x80)) { + av_log(s, AV_LOG_ERROR, "GXF: invalid track type %x\n", track_type); + continue; + } + track_type &= 0x7f; + if ((track_id & 0xc0) != 0xc0) { + av_log(s, AV_LOG_ERROR, "GXF: invalid track id %x\n", track_id); + continue; + } + track_id &= 0x3f; + get_sindex(s, track_id, track_type); + } + if (len < 0) + av_log(s, AV_LOG_ERROR, "GXF: invalid track description length specified\n"); + if (map_len) + url_fskip(pb, map_len); + return 0; +} + +static int gxf_packet(AVFormatContext *s, AVPacket *pkt) { + ByteIOContext *pb = &s->pb; + pkt_type_t pkt_type; + int pkt_len; + while (!url_feof(pb)) { + int track_type, track_id, ret; + if (!parse_packet_header(pb, &pkt_type, &pkt_len)) { + if (!url_feof(pb)) + av_log(s, AV_LOG_ERROR, "GXF: sync lost\n"); + return -1; + } + if (pkt_type != PKT_MEDIA) { + url_fskip(pb, pkt_len); + continue; + } + if (pkt_len < 16) { + av_log(s, AV_LOG_ERROR, "GXF: invalid media packet length\n"); + continue; + } + pkt_len -= 16; + track_type = get_byte(pb); + track_id = get_byte(pb); + get_be32(pb); // field number + get_be32(pb); // field information + get_be32(pb); // "timeline" field number + get_byte(pb); // flags + get_byte(pb); // reserved + // NOTE: there is also data length information in the + // field information, it might be better to take this int account + // as well. + ret = av_get_packet(pb, pkt, pkt_len); + pkt->stream_index = get_sindex(s, track_id, track_type); + return ret; + } + return AVERROR_IO; +} + +static AVInputFormat gxf_iformat = { + "gxf", + "GXF format", + 0, + gxf_probe, + gxf_header, + gxf_packet, + NULL, + NULL, +}; + +int gxf_init(void) { + av_register_input_format(&gxf_iformat); + return 0; +} + -- cgit v1.2.3