| /* |
| * 4X Technologies .4xm File Demuxer (no muxer) |
| * Copyright (c) 2003 The FFmpeg project |
| * |
| * 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 |
| */ |
| |
| /** |
| * @file |
| * 4X Technologies file demuxer |
| * by Mike Melanson (melanson@pcisys.net) |
| * for more information on the .4xm file format, visit: |
| * http://www.pcisys.net/~melanson/codecs/ |
| */ |
| |
| #include "libavutil/intreadwrite.h" |
| #include "libavutil/intfloat.h" |
| #include "libavcodec/internal.h" |
| #include "avformat.h" |
| #include "internal.h" |
| |
| #define RIFF_TAG MKTAG('R', 'I', 'F', 'F') |
| #define FOURXMV_TAG MKTAG('4', 'X', 'M', 'V') |
| #define LIST_TAG MKTAG('L', 'I', 'S', 'T') |
| #define HEAD_TAG MKTAG('H', 'E', 'A', 'D') |
| #define TRK__TAG MKTAG('T', 'R', 'K', '_') |
| #define MOVI_TAG MKTAG('M', 'O', 'V', 'I') |
| #define VTRK_TAG MKTAG('V', 'T', 'R', 'K') |
| #define STRK_TAG MKTAG('S', 'T', 'R', 'K') |
| #define std__TAG MKTAG('s', 't', 'd', '_') |
| #define name_TAG MKTAG('n', 'a', 'm', 'e') |
| #define vtrk_TAG MKTAG('v', 't', 'r', 'k') |
| #define strk_TAG MKTAG('s', 't', 'r', 'k') |
| #define ifrm_TAG MKTAG('i', 'f', 'r', 'm') |
| #define pfrm_TAG MKTAG('p', 'f', 'r', 'm') |
| #define cfrm_TAG MKTAG('c', 'f', 'r', 'm') |
| #define ifr2_TAG MKTAG('i', 'f', 'r', '2') |
| #define pfr2_TAG MKTAG('p', 'f', 'r', '2') |
| #define cfr2_TAG MKTAG('c', 'f', 'r', '2') |
| #define snd__TAG MKTAG('s', 'n', 'd', '_') |
| |
| #define vtrk_SIZE 0x44 |
| #define strk_SIZE 0x28 |
| |
| #define GET_LIST_HEADER() \ |
| fourcc_tag = avio_rl32(pb); \ |
| size = avio_rl32(pb); \ |
| if (fourcc_tag != LIST_TAG) { \ |
| ret = AVERROR_INVALIDDATA; \ |
| goto fail; \ |
| } \ |
| fourcc_tag = avio_rl32(pb); |
| |
| typedef struct AudioTrack { |
| int sample_rate; |
| int bits; |
| int channels; |
| int stream_index; |
| int adpcm; |
| int64_t audio_pts; |
| } AudioTrack; |
| |
| typedef struct FourxmDemuxContext { |
| int video_stream_index; |
| int track_count; |
| AudioTrack *tracks; |
| |
| int64_t video_pts; |
| AVRational fps; |
| } FourxmDemuxContext; |
| |
| static int fourxm_probe(const AVProbeData *p) |
| { |
| if ((AV_RL32(&p->buf[0]) != RIFF_TAG) || |
| (AV_RL32(&p->buf[8]) != FOURXMV_TAG)) |
| return 0; |
| |
| return AVPROBE_SCORE_MAX; |
| } |
| |
| static int parse_vtrk(AVFormatContext *s, |
| FourxmDemuxContext *fourxm, uint8_t *buf, int size, |
| int left) |
| { |
| AVStream *st; |
| /* check that there is enough data */ |
| if (size != vtrk_SIZE || left < size + 8) { |
| return AVERROR_INVALIDDATA; |
| } |
| |
| /* allocate a new AVStream */ |
| st = avformat_new_stream(s, NULL); |
| if (!st) |
| return AVERROR(ENOMEM); |
| |
| avpriv_set_pts_info(st, 60, fourxm->fps.den, fourxm->fps.num); |
| |
| fourxm->video_stream_index = st->index; |
| |
| st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO; |
| st->codecpar->codec_id = AV_CODEC_ID_4XM; |
| |
| st->codecpar->extradata = av_mallocz(4 + AV_INPUT_BUFFER_PADDING_SIZE); |
| if (!st->codecpar->extradata) |
| return AVERROR(ENOMEM); |
| st->codecpar->extradata_size = 4; |
| AV_WL32(st->codecpar->extradata, AV_RL32(buf + 16)); |
| st->codecpar->width = AV_RL32(buf + 36); |
| st->codecpar->height = AV_RL32(buf + 40); |
| |
| return 0; |
| } |
| |
| |
| static int parse_strk(AVFormatContext *s, |
| FourxmDemuxContext *fourxm, uint8_t *buf, int size, |
| int left) |
| { |
| AVStream *st; |
| int track; |
| /* check that there is enough data */ |
| if (size != strk_SIZE || left < size + 8) |
| return AVERROR_INVALIDDATA; |
| |
| track = AV_RL32(buf + 8); |
| if ((unsigned)track >= UINT_MAX / sizeof(AudioTrack) - 1) { |
| av_log(s, AV_LOG_ERROR, "current_track too large\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| if (track + 1 > fourxm->track_count) { |
| if (av_reallocp_array(&fourxm->tracks, track + 1, sizeof(AudioTrack))) |
| return AVERROR(ENOMEM); |
| memset(&fourxm->tracks[fourxm->track_count], 0, |
| sizeof(AudioTrack) * (track + 1 - fourxm->track_count)); |
| fourxm->track_count = track + 1; |
| } |
| fourxm->tracks[track].adpcm = AV_RL32(buf + 12); |
| fourxm->tracks[track].channels = AV_RL32(buf + 36); |
| fourxm->tracks[track].sample_rate = AV_RL32(buf + 40); |
| fourxm->tracks[track].bits = AV_RL32(buf + 44); |
| fourxm->tracks[track].audio_pts = 0; |
| |
| if (fourxm->tracks[track].channels <= 0 || |
| fourxm->tracks[track].channels > FF_SANE_NB_CHANNELS || |
| fourxm->tracks[track].sample_rate <= 0 || |
| fourxm->tracks[track].bits <= 0 || |
| fourxm->tracks[track].bits > INT_MAX / FF_SANE_NB_CHANNELS) { |
| av_log(s, AV_LOG_ERROR, "audio header invalid\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| if (!fourxm->tracks[track].adpcm && fourxm->tracks[track].bits<8) { |
| av_log(s, AV_LOG_ERROR, "bits unspecified for non ADPCM\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| if (fourxm->tracks[track].sample_rate > INT64_MAX / fourxm->tracks[track].bits / fourxm->tracks[track].channels) { |
| av_log(s, AV_LOG_ERROR, "Overflow during bit rate calculation %d * %d * %d\n", |
| fourxm->tracks[track].sample_rate, fourxm->tracks[track].bits, fourxm->tracks[track].channels); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| /* allocate a new AVStream */ |
| st = avformat_new_stream(s, NULL); |
| if (!st) |
| return AVERROR(ENOMEM); |
| |
| st->id = track; |
| avpriv_set_pts_info(st, 60, 1, fourxm->tracks[track].sample_rate); |
| |
| fourxm->tracks[track].stream_index = st->index; |
| |
| st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; |
| st->codecpar->codec_tag = 0; |
| st->codecpar->channels = fourxm->tracks[track].channels; |
| st->codecpar->sample_rate = fourxm->tracks[track].sample_rate; |
| st->codecpar->bits_per_coded_sample = fourxm->tracks[track].bits; |
| st->codecpar->bit_rate = (int64_t)st->codecpar->channels * |
| st->codecpar->sample_rate * |
| st->codecpar->bits_per_coded_sample; |
| st->codecpar->block_align = st->codecpar->channels * |
| st->codecpar->bits_per_coded_sample; |
| |
| if (fourxm->tracks[track].adpcm){ |
| st->codecpar->codec_id = AV_CODEC_ID_ADPCM_4XM; |
| } else if (st->codecpar->bits_per_coded_sample == 8) { |
| st->codecpar->codec_id = AV_CODEC_ID_PCM_U8; |
| } else |
| st->codecpar->codec_id = AV_CODEC_ID_PCM_S16LE; |
| |
| return 0; |
| } |
| |
| static int fourxm_read_header(AVFormatContext *s) |
| { |
| AVIOContext *pb = s->pb; |
| unsigned int fourcc_tag; |
| unsigned int size; |
| int header_size; |
| FourxmDemuxContext *fourxm = s->priv_data; |
| unsigned char *header = NULL; |
| int i, ret; |
| |
| fourxm->track_count = 0; |
| fourxm->tracks = NULL; |
| fourxm->fps = (AVRational){1,1}; |
| fourxm->video_stream_index = -1; |
| |
| /* skip the first 3 32-bit numbers */ |
| avio_skip(pb, 12); |
| |
| /* check for LIST-HEAD */ |
| GET_LIST_HEADER(); |
| header_size = size - 4; |
| if (fourcc_tag != HEAD_TAG || header_size < 0) |
| return AVERROR_INVALIDDATA; |
| |
| /* allocate space for the header and load the whole thing */ |
| header = av_malloc(header_size); |
| if (!header) |
| return AVERROR(ENOMEM); |
| if (avio_read(pb, header, header_size) != header_size) { |
| av_free(header); |
| return AVERROR(EIO); |
| } |
| |
| /* take the lazy approach and search for any and all vtrk and strk chunks */ |
| for (i = 0; i < header_size - 8; i++) { |
| fourcc_tag = AV_RL32(&header[i]); |
| size = AV_RL32(&header[i + 4]); |
| if (size > header_size - i - 8 && (fourcc_tag == vtrk_TAG || fourcc_tag == strk_TAG)) { |
| av_log(s, AV_LOG_ERROR, "chunk larger than array %d>%d\n", size, header_size - i - 8); |
| ret = AVERROR_INVALIDDATA; |
| goto fail; |
| } |
| |
| if (fourcc_tag == std__TAG) { |
| if (header_size - i < 16) { |
| av_log(s, AV_LOG_ERROR, "std TAG truncated\n"); |
| ret = AVERROR_INVALIDDATA; |
| goto fail; |
| } |
| fourxm->fps = av_d2q(av_int2float(AV_RL32(&header[i + 12])), 10000); |
| } else if (fourcc_tag == vtrk_TAG) { |
| if ((ret = parse_vtrk(s, fourxm, header + i, size, |
| header_size - i)) < 0) |
| goto fail; |
| |
| i += 8 + size; |
| } else if (fourcc_tag == strk_TAG) { |
| if ((ret = parse_strk(s, fourxm, header + i, size, |
| header_size - i)) < 0) |
| goto fail; |
| |
| i += 8 + size; |
| } |
| } |
| |
| /* skip over the LIST-MOVI chunk (which is where the stream should be */ |
| GET_LIST_HEADER(); |
| if (fourcc_tag != MOVI_TAG) { |
| ret = AVERROR_INVALIDDATA; |
| goto fail; |
| } |
| |
| av_free(header); |
| /* initialize context members */ |
| fourxm->video_pts = -1; /* first frame will push to 0 */ |
| |
| return 0; |
| fail: |
| av_freep(&fourxm->tracks); |
| av_free(header); |
| return ret; |
| } |
| |
| static int fourxm_read_packet(AVFormatContext *s, |
| AVPacket *pkt) |
| { |
| FourxmDemuxContext *fourxm = s->priv_data; |
| AVIOContext *pb = s->pb; |
| unsigned int fourcc_tag; |
| unsigned int size; |
| int ret = 0; |
| unsigned int track_number; |
| int packet_read = 0; |
| unsigned char header[8]; |
| int audio_frame_count; |
| |
| while (!packet_read) { |
| if ((ret = avio_read(s->pb, header, 8)) < 0) |
| return ret; |
| fourcc_tag = AV_RL32(&header[0]); |
| size = AV_RL32(&header[4]); |
| if (avio_feof(pb)) |
| return AVERROR(EIO); |
| switch (fourcc_tag) { |
| case LIST_TAG: |
| /* this is a good time to bump the video pts */ |
| fourxm->video_pts++; |
| |
| /* skip the LIST-* tag and move on to the next fourcc */ |
| avio_rl32(pb); |
| break; |
| |
| case ifrm_TAG: |
| case pfrm_TAG: |
| case cfrm_TAG: |
| case ifr2_TAG: |
| case pfr2_TAG: |
| case cfr2_TAG: |
| /* allocate 8 more bytes than 'size' to account for fourcc |
| * and size */ |
| if (size > INT_MAX - AV_INPUT_BUFFER_PADDING_SIZE - 8) |
| return AVERROR_INVALIDDATA; |
| if (fourxm->video_stream_index < 0) |
| return AVERROR_INVALIDDATA; |
| if ((ret = av_new_packet(pkt, size + 8)) < 0) |
| return ret; |
| pkt->stream_index = fourxm->video_stream_index; |
| pkt->pts = fourxm->video_pts; |
| pkt->pos = avio_tell(s->pb); |
| memcpy(pkt->data, header, 8); |
| ret = avio_read(s->pb, &pkt->data[8], size); |
| |
| if (ret < 0) { |
| av_packet_unref(pkt); |
| } else { |
| packet_read = 1; |
| av_shrink_packet(pkt, ret + 8); |
| } |
| break; |
| |
| case snd__TAG: |
| track_number = avio_rl32(pb); |
| avio_skip(pb, 4); |
| size -= 8; |
| |
| if (track_number < fourxm->track_count && |
| fourxm->tracks[track_number].channels > 0) { |
| ret = av_get_packet(s->pb, pkt, size); |
| if (ret < 0) |
| return ret; |
| pkt->stream_index = |
| fourxm->tracks[track_number].stream_index; |
| pkt->pts = fourxm->tracks[track_number].audio_pts; |
| packet_read = 1; |
| |
| /* pts accounting */ |
| audio_frame_count = size; |
| if (fourxm->tracks[track_number].adpcm) |
| audio_frame_count -= 2 * (fourxm->tracks[track_number].channels); |
| audio_frame_count /= fourxm->tracks[track_number].channels; |
| if (fourxm->tracks[track_number].adpcm) { |
| audio_frame_count *= 2; |
| } else |
| audio_frame_count /= |
| (fourxm->tracks[track_number].bits / 8); |
| fourxm->tracks[track_number].audio_pts += audio_frame_count; |
| } else { |
| avio_skip(pb, size); |
| } |
| break; |
| |
| default: |
| avio_skip(pb, size); |
| break; |
| } |
| } |
| return ret; |
| } |
| |
| static int fourxm_read_close(AVFormatContext *s) |
| { |
| FourxmDemuxContext *fourxm = s->priv_data; |
| |
| av_freep(&fourxm->tracks); |
| |
| return 0; |
| } |
| |
| AVInputFormat ff_fourxm_demuxer = { |
| .name = "4xm", |
| .long_name = NULL_IF_CONFIG_SMALL("4X Technologies"), |
| .priv_data_size = sizeof(FourxmDemuxContext), |
| .read_probe = fourxm_probe, |
| .read_header = fourxm_read_header, |
| .read_packet = fourxm_read_packet, |
| .read_close = fourxm_read_close, |
| }; |