yading@11: /* yading@11: * 4X Technologies .4xm File Demuxer (no muxer) yading@11: * Copyright (c) 2003 The ffmpeg Project yading@11: * yading@11: * This file is part of FFmpeg. yading@11: * yading@11: * FFmpeg is free software; you can redistribute it and/or yading@11: * modify it under the terms of the GNU Lesser General Public yading@11: * License as published by the Free Software Foundation; either yading@11: * version 2.1 of the License, or (at your option) any later version. yading@11: * yading@11: * FFmpeg is distributed in the hope that it will be useful, yading@11: * but WITHOUT ANY WARRANTY; without even the implied warranty of yading@11: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU yading@11: * Lesser General Public License for more details. yading@11: * yading@11: * You should have received a copy of the GNU Lesser General Public yading@11: * License along with FFmpeg; if not, write to the Free Software yading@11: * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA yading@11: */ yading@11: yading@11: /** yading@11: * @file yading@11: * 4X Technologies file demuxer yading@11: * by Mike Melanson (melanson@pcisys.net) yading@11: * for more information on the .4xm file format, visit: yading@11: * http://www.pcisys.net/~melanson/codecs/ yading@11: */ yading@11: yading@11: #include "libavutil/intreadwrite.h" yading@11: #include "libavutil/intfloat.h" yading@11: #include "avformat.h" yading@11: #include "internal.h" yading@11: yading@11: #define RIFF_TAG MKTAG('R', 'I', 'F', 'F') yading@11: #define FOURXMV_TAG MKTAG('4', 'X', 'M', 'V') yading@11: #define LIST_TAG MKTAG('L', 'I', 'S', 'T') yading@11: #define HEAD_TAG MKTAG('H', 'E', 'A', 'D') yading@11: #define TRK__TAG MKTAG('T', 'R', 'K', '_') yading@11: #define MOVI_TAG MKTAG('M', 'O', 'V', 'I') yading@11: #define VTRK_TAG MKTAG('V', 'T', 'R', 'K') yading@11: #define STRK_TAG MKTAG('S', 'T', 'R', 'K') yading@11: #define std__TAG MKTAG('s', 't', 'd', '_') yading@11: #define name_TAG MKTAG('n', 'a', 'm', 'e') yading@11: #define vtrk_TAG MKTAG('v', 't', 'r', 'k') yading@11: #define strk_TAG MKTAG('s', 't', 'r', 'k') yading@11: #define ifrm_TAG MKTAG('i', 'f', 'r', 'm') yading@11: #define pfrm_TAG MKTAG('p', 'f', 'r', 'm') yading@11: #define cfrm_TAG MKTAG('c', 'f', 'r', 'm') yading@11: #define ifr2_TAG MKTAG('i', 'f', 'r', '2') yading@11: #define pfr2_TAG MKTAG('p', 'f', 'r', '2') yading@11: #define cfr2_TAG MKTAG('c', 'f', 'r', '2') yading@11: #define snd__TAG MKTAG('s', 'n', 'd', '_') yading@11: yading@11: #define vtrk_SIZE 0x44 yading@11: #define strk_SIZE 0x28 yading@11: yading@11: #define GET_LIST_HEADER() \ yading@11: fourcc_tag = avio_rl32(pb); \ yading@11: size = avio_rl32(pb); \ yading@11: if (fourcc_tag != LIST_TAG) \ yading@11: return AVERROR_INVALIDDATA; \ yading@11: fourcc_tag = avio_rl32(pb); yading@11: yading@11: typedef struct AudioTrack { yading@11: int sample_rate; yading@11: int bits; yading@11: int channels; yading@11: int stream_index; yading@11: int adpcm; yading@11: int64_t audio_pts; yading@11: } AudioTrack; yading@11: yading@11: typedef struct FourxmDemuxContext { yading@11: int width; yading@11: int height; yading@11: int video_stream_index; yading@11: int track_count; yading@11: AudioTrack *tracks; yading@11: yading@11: int64_t video_pts; yading@11: float fps; yading@11: } FourxmDemuxContext; yading@11: yading@11: static int fourxm_probe(AVProbeData *p) yading@11: { yading@11: if ((AV_RL32(&p->buf[0]) != RIFF_TAG) || yading@11: (AV_RL32(&p->buf[8]) != FOURXMV_TAG)) yading@11: return 0; yading@11: yading@11: return AVPROBE_SCORE_MAX; yading@11: } yading@11: yading@11: static int fourxm_read_header(AVFormatContext *s) yading@11: { yading@11: AVIOContext *pb = s->pb; yading@11: unsigned int fourcc_tag; yading@11: unsigned int size; yading@11: int header_size; yading@11: FourxmDemuxContext *fourxm = s->priv_data; yading@11: unsigned char *header; yading@11: int i, ret; yading@11: AVStream *st; yading@11: yading@11: fourxm->track_count = 0; yading@11: fourxm->tracks = NULL; yading@11: fourxm->fps = 1.0; yading@11: yading@11: /* skip the first 3 32-bit numbers */ yading@11: avio_skip(pb, 12); yading@11: yading@11: /* check for LIST-HEAD */ yading@11: GET_LIST_HEADER(); yading@11: header_size = size - 4; yading@11: if (fourcc_tag != HEAD_TAG || header_size < 0) yading@11: return AVERROR_INVALIDDATA; yading@11: yading@11: /* allocate space for the header and load the whole thing */ yading@11: header = av_malloc(header_size); yading@11: if (!header) yading@11: return AVERROR(ENOMEM); yading@11: if (avio_read(pb, header, header_size) != header_size){ yading@11: av_free(header); yading@11: return AVERROR(EIO); yading@11: } yading@11: yading@11: /* take the lazy approach and search for any and all vtrk and strk chunks */ yading@11: for (i = 0; i < header_size - 8; i++) { yading@11: fourcc_tag = AV_RL32(&header[i]); yading@11: size = AV_RL32(&header[i + 4]); yading@11: if (size > header_size - i - 8 && (fourcc_tag == vtrk_TAG || fourcc_tag == strk_TAG)) { yading@11: av_log(s, AV_LOG_ERROR, "chunk larger than array %d>%d\n", size, header_size - i - 8); yading@11: return AVERROR_INVALIDDATA; yading@11: } yading@11: yading@11: if (fourcc_tag == std__TAG) { yading@11: if (header_size < i + 16) { yading@11: av_log(s, AV_LOG_ERROR, "std TAG truncated\n"); yading@11: return AVERROR_INVALIDDATA; yading@11: } yading@11: fourxm->fps = av_int2float(AV_RL32(&header[i + 12])); yading@11: } else if (fourcc_tag == vtrk_TAG) { yading@11: /* check that there is enough data */ yading@11: if (size != vtrk_SIZE) { yading@11: ret= AVERROR_INVALIDDATA; yading@11: goto fail; yading@11: } yading@11: fourxm->width = AV_RL32(&header[i + 36]); yading@11: fourxm->height = AV_RL32(&header[i + 40]); yading@11: yading@11: /* allocate a new AVStream */ yading@11: st = avformat_new_stream(s, NULL); yading@11: if (!st){ yading@11: ret= AVERROR(ENOMEM); yading@11: goto fail; yading@11: } yading@11: avpriv_set_pts_info(st, 60, 1, fourxm->fps); yading@11: yading@11: fourxm->video_stream_index = st->index; yading@11: yading@11: st->codec->codec_type = AVMEDIA_TYPE_VIDEO; yading@11: st->codec->codec_id = AV_CODEC_ID_4XM; yading@11: st->codec->extradata_size = 4; yading@11: st->codec->extradata = av_malloc(4); yading@11: AV_WL32(st->codec->extradata, AV_RL32(&header[i + 16])); yading@11: st->codec->width = fourxm->width; yading@11: st->codec->height = fourxm->height; yading@11: yading@11: i += 8 + size; yading@11: } else if (fourcc_tag == strk_TAG) { yading@11: int current_track; yading@11: /* check that there is enough data */ yading@11: if (size != strk_SIZE) { yading@11: ret= AVERROR_INVALIDDATA; yading@11: goto fail; yading@11: } yading@11: current_track = AV_RL32(&header[i + 8]); yading@11: if((unsigned)current_track >= UINT_MAX / sizeof(AudioTrack) - 1){ yading@11: av_log(s, AV_LOG_ERROR, "current_track too large\n"); yading@11: ret = AVERROR_INVALIDDATA; yading@11: goto fail; yading@11: } yading@11: if (current_track + 1 > fourxm->track_count) { yading@11: fourxm->tracks = av_realloc_f(fourxm->tracks, yading@11: sizeof(AudioTrack), yading@11: current_track + 1); yading@11: if (!fourxm->tracks) { yading@11: ret = AVERROR(ENOMEM); yading@11: goto fail; yading@11: } yading@11: memset(&fourxm->tracks[fourxm->track_count], 0, yading@11: sizeof(AudioTrack) * (current_track + 1 - fourxm->track_count)); yading@11: fourxm->track_count = current_track + 1; yading@11: } yading@11: fourxm->tracks[current_track].adpcm = AV_RL32(&header[i + 12]); yading@11: fourxm->tracks[current_track].channels = AV_RL32(&header[i + 36]); yading@11: fourxm->tracks[current_track].sample_rate = AV_RL32(&header[i + 40]); yading@11: fourxm->tracks[current_track].bits = AV_RL32(&header[i + 44]); yading@11: fourxm->tracks[current_track].audio_pts = 0; yading@11: if( fourxm->tracks[current_track].channels <= 0 yading@11: || fourxm->tracks[current_track].sample_rate <= 0 yading@11: || fourxm->tracks[current_track].bits < 0){ yading@11: av_log(s, AV_LOG_ERROR, "audio header invalid\n"); yading@11: ret = AVERROR_INVALIDDATA; yading@11: goto fail; yading@11: } yading@11: if(!fourxm->tracks[current_track].adpcm && fourxm->tracks[current_track].bits<8){ yading@11: av_log(s, AV_LOG_ERROR, "bits unspecified for non ADPCM\n"); yading@11: ret = AVERROR_INVALIDDATA; yading@11: goto fail; yading@11: } yading@11: i += 8 + size; yading@11: yading@11: /* allocate a new AVStream */ yading@11: st = avformat_new_stream(s, NULL); yading@11: if (!st){ yading@11: ret= AVERROR(ENOMEM); yading@11: goto fail; yading@11: } yading@11: yading@11: st->id = current_track; yading@11: avpriv_set_pts_info(st, 60, 1, fourxm->tracks[current_track].sample_rate); yading@11: yading@11: fourxm->tracks[current_track].stream_index = st->index; yading@11: yading@11: st->codec->codec_type = AVMEDIA_TYPE_AUDIO; yading@11: st->codec->codec_tag = 0; yading@11: st->codec->channels = fourxm->tracks[current_track].channels; yading@11: st->codec->sample_rate = fourxm->tracks[current_track].sample_rate; yading@11: st->codec->bits_per_coded_sample = fourxm->tracks[current_track].bits; yading@11: st->codec->bit_rate = st->codec->channels * st->codec->sample_rate * yading@11: st->codec->bits_per_coded_sample; yading@11: st->codec->block_align = st->codec->channels * st->codec->bits_per_coded_sample; yading@11: if (fourxm->tracks[current_track].adpcm){ yading@11: st->codec->codec_id = AV_CODEC_ID_ADPCM_4XM; yading@11: }else if (st->codec->bits_per_coded_sample == 8){ yading@11: st->codec->codec_id = AV_CODEC_ID_PCM_U8; yading@11: }else yading@11: st->codec->codec_id = AV_CODEC_ID_PCM_S16LE; yading@11: } yading@11: } yading@11: yading@11: /* skip over the LIST-MOVI chunk (which is where the stream should be */ yading@11: GET_LIST_HEADER(); yading@11: if (fourcc_tag != MOVI_TAG){ yading@11: ret= AVERROR_INVALIDDATA; yading@11: goto fail; yading@11: } yading@11: yading@11: av_free(header); yading@11: /* initialize context members */ yading@11: fourxm->video_pts = -1; /* first frame will push to 0 */ yading@11: yading@11: return 0; yading@11: fail: yading@11: av_freep(&fourxm->tracks); yading@11: av_free(header); yading@11: return ret; yading@11: } yading@11: yading@11: static int fourxm_read_packet(AVFormatContext *s, yading@11: AVPacket *pkt) yading@11: { yading@11: FourxmDemuxContext *fourxm = s->priv_data; yading@11: AVIOContext *pb = s->pb; yading@11: unsigned int fourcc_tag; yading@11: unsigned int size; yading@11: int ret = 0; yading@11: unsigned int track_number; yading@11: int packet_read = 0; yading@11: unsigned char header[8]; yading@11: int audio_frame_count; yading@11: yading@11: while (!packet_read) { yading@11: yading@11: if ((ret = avio_read(s->pb, header, 8)) < 0) yading@11: return ret; yading@11: fourcc_tag = AV_RL32(&header[0]); yading@11: size = AV_RL32(&header[4]); yading@11: if (url_feof(pb)) yading@11: return AVERROR(EIO); yading@11: switch (fourcc_tag) { yading@11: yading@11: case LIST_TAG: yading@11: /* this is a good time to bump the video pts */ yading@11: fourxm->video_pts ++; yading@11: yading@11: /* skip the LIST-* tag and move on to the next fourcc */ yading@11: avio_rl32(pb); yading@11: break; yading@11: yading@11: case ifrm_TAG: yading@11: case pfrm_TAG: yading@11: case cfrm_TAG: yading@11: case ifr2_TAG: yading@11: case pfr2_TAG: yading@11: case cfr2_TAG: yading@11: /* allocate 8 more bytes than 'size' to account for fourcc yading@11: * and size */ yading@11: if (size + 8 < size || av_new_packet(pkt, size + 8)) yading@11: return AVERROR(EIO); yading@11: pkt->stream_index = fourxm->video_stream_index; yading@11: pkt->pts = fourxm->video_pts; yading@11: pkt->pos = avio_tell(s->pb); yading@11: memcpy(pkt->data, header, 8); yading@11: ret = avio_read(s->pb, &pkt->data[8], size); yading@11: yading@11: if (ret < 0){ yading@11: av_free_packet(pkt); yading@11: }else yading@11: packet_read = 1; yading@11: break; yading@11: yading@11: case snd__TAG: yading@11: track_number = avio_rl32(pb); yading@11: avio_skip(pb, 4); yading@11: size-=8; yading@11: yading@11: if (track_number < fourxm->track_count && fourxm->tracks[track_number].channels>0) { yading@11: ret= av_get_packet(s->pb, pkt, size); yading@11: if(ret<0) yading@11: return AVERROR(EIO); yading@11: pkt->stream_index = yading@11: fourxm->tracks[track_number].stream_index; yading@11: pkt->pts = fourxm->tracks[track_number].audio_pts; yading@11: packet_read = 1; yading@11: yading@11: /* pts accounting */ yading@11: audio_frame_count = size; yading@11: if (fourxm->tracks[track_number].adpcm) yading@11: audio_frame_count -= yading@11: 2 * (fourxm->tracks[track_number].channels); yading@11: audio_frame_count /= yading@11: fourxm->tracks[track_number].channels; yading@11: if (fourxm->tracks[track_number].adpcm){ yading@11: audio_frame_count *= 2; yading@11: }else yading@11: audio_frame_count /= yading@11: (fourxm->tracks[track_number].bits / 8); yading@11: fourxm->tracks[track_number].audio_pts += audio_frame_count; yading@11: yading@11: } else { yading@11: avio_skip(pb, size); yading@11: } yading@11: break; yading@11: yading@11: default: yading@11: avio_skip(pb, size); yading@11: break; yading@11: } yading@11: } yading@11: return ret; yading@11: } yading@11: yading@11: static int fourxm_read_close(AVFormatContext *s) yading@11: { yading@11: FourxmDemuxContext *fourxm = s->priv_data; yading@11: yading@11: av_freep(&fourxm->tracks); yading@11: yading@11: return 0; yading@11: } yading@11: yading@11: AVInputFormat ff_fourxm_demuxer = { yading@11: .name = "4xm", yading@11: .long_name = NULL_IF_CONFIG_SMALL("4X Technologies"), yading@11: .priv_data_size = sizeof(FourxmDemuxContext), yading@11: .read_probe = fourxm_probe, yading@11: .read_header = fourxm_read_header, yading@11: .read_packet = fourxm_read_packet, yading@11: .read_close = fourxm_read_close, yading@11: };