diff options
Diffstat (limited to 'ffmpeg/libavformat/lmlm4.c')
| -rw-r--r-- | ffmpeg/libavformat/lmlm4.c | 127 |
1 files changed, 0 insertions, 127 deletions
diff --git a/ffmpeg/libavformat/lmlm4.c b/ffmpeg/libavformat/lmlm4.c deleted file mode 100644 index c8ea421..0000000 --- a/ffmpeg/libavformat/lmlm4.c +++ /dev/null @@ -1,127 +0,0 @@ -/* - * Linux Media Labs MPEG-4 demuxer - * Copyright (c) 2008 Ivo van Poorten - * - * Due to a lack of sample files, only files with one channel are supported. - * u-law and ADPCM audio are unsupported for the same reason. - * - * This file is part of FFmpeg. - * - * FFmpeg 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 2.1 of the License, or (at your option) any later version. - * - * FFmpeg 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 FFmpeg; if not, write to the Free Software - * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA - */ - -#include "libavutil/intreadwrite.h" -#include "avformat.h" -#include "internal.h" - -#define LMLM4_I_FRAME 0x00 -#define LMLM4_P_FRAME 0x01 -#define LMLM4_B_FRAME 0x02 -#define LMLM4_INVALID 0x03 -#define LMLM4_MPEG1L2 0x04 - -#define LMLM4_MAX_PACKET_SIZE 1024 * 1024 - -static int lmlm4_probe(AVProbeData * pd) { - const unsigned char *buf = pd->buf; - unsigned int frame_type, packet_size; - - frame_type = AV_RB16(buf+2); - packet_size = AV_RB32(buf+4); - - if (!AV_RB16(buf) && frame_type <= LMLM4_MPEG1L2 && packet_size && - frame_type != LMLM4_INVALID && packet_size <= LMLM4_MAX_PACKET_SIZE) { - - if (frame_type == LMLM4_MPEG1L2) { - if ((AV_RB16(buf+8) & 0xfffe) != 0xfffc) - return 0; - /* I could calculate the audio framesize and compare with - * packet_size-8, but that seems overkill */ - return AVPROBE_SCORE_MAX / 3; - } else if (AV_RB24(buf+8) == 0x000001) { /* PES Signal */ - return AVPROBE_SCORE_MAX / 5; - } - } - - return 0; -} - -static int lmlm4_read_header(AVFormatContext *s) { - AVStream *st; - - if (!(st = avformat_new_stream(s, NULL))) - return AVERROR(ENOMEM); - st->codec->codec_type = AVMEDIA_TYPE_VIDEO; - st->codec->codec_id = AV_CODEC_ID_MPEG4; - st->need_parsing = AVSTREAM_PARSE_HEADERS; - avpriv_set_pts_info(st, 64, 1001, 30000); - - if (!(st = avformat_new_stream(s, NULL))) - return AVERROR(ENOMEM); - st->codec->codec_type = AVMEDIA_TYPE_AUDIO; - st->codec->codec_id = AV_CODEC_ID_MP2; - st->need_parsing = AVSTREAM_PARSE_HEADERS; - - /* the parameters will be extracted from the compressed bitstream */ - return 0; -} - -static int lmlm4_read_packet(AVFormatContext *s, AVPacket *pkt) { - AVIOContext *pb = s->pb; - int ret; - unsigned int frame_type, packet_size, padding, frame_size; - - avio_rb16(pb); /* channel number */ - frame_type = avio_rb16(pb); - packet_size = avio_rb32(pb); - padding = -packet_size & 511; - frame_size = packet_size - 8; - - if (frame_type > LMLM4_MPEG1L2 || frame_type == LMLM4_INVALID) { - av_log(s, AV_LOG_ERROR, "invalid or unsupported frame_type\n"); - return AVERROR(EIO); - } - if (packet_size > LMLM4_MAX_PACKET_SIZE || packet_size<=8) { - av_log(s, AV_LOG_ERROR, "packet size %d is invalid\n", packet_size); - return AVERROR(EIO); - } - - if ((ret = av_get_packet(pb, pkt, frame_size)) <= 0) - return AVERROR(EIO); - - avio_skip(pb, padding); - - switch (frame_type) { - case LMLM4_I_FRAME: - pkt->flags = AV_PKT_FLAG_KEY; - case LMLM4_P_FRAME: - case LMLM4_B_FRAME: - pkt->stream_index = 0; - break; - case LMLM4_MPEG1L2: - pkt->stream_index = 1; - break; - } - - return ret; -} - -AVInputFormat ff_lmlm4_demuxer = { - .name = "lmlm4", - .long_name = NULL_IF_CONFIG_SMALL("raw lmlm4"), - .read_probe = lmlm4_probe, - .read_header = lmlm4_read_header, - .read_packet = lmlm4_read_packet, -}; |