diff options
author | David Kment <info@davidkment.de> | 2013-10-28 04:38:02 +0400 |
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committer | Diego Biurrun <diego@biurrun.de> | 2013-10-31 20:45:46 +0400 |
commit | 9af7a8523a6bb517834ebed36093bdab11a8b38e (patch) | |
tree | c2a7ba04ea610925d5ce72d11399c656fd17ccf9 /libavformat/hnm.c | |
parent | ed1a11ed52bbd1f15bb9b0416d69b7924bee3191 (diff) |
HNM4/HNM4A demuxer & video decoder
Signed-off-by: Diego Biurrun <diego@biurrun.de>
Diffstat (limited to 'libavformat/hnm.c')
-rw-r--r-- | libavformat/hnm.c | 204 |
1 files changed, 204 insertions, 0 deletions
diff --git a/libavformat/hnm.c b/libavformat/hnm.c new file mode 100644 index 0000000000..ee34a14aa4 --- /dev/null +++ b/libavformat/hnm.c @@ -0,0 +1,204 @@ +/* + * Cryo Interactive Entertainment HNM4 demuxer + * + * Copyright (c) 2012 David Kment + * + * This file is part of Libav. + * + * Libav 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. + * + * Libav 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 Libav; 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 HNM4_TAG MKTAG('H', 'N', 'M', '4') + +#define HNM4_SAMPLE_RATE 22050 +#define HNM4_FRAME_FPS 24 + +#define HNM4_CHUNK_ID_PL 19536 +#define HNM4_CHUNK_ID_IZ 23113 +#define HNM4_CHUNK_ID_IU 21833 +#define HNM4_CHUNK_ID_SD 17491 + +typedef struct Hnm4DemuxContext { + uint8_t version; + uint16_t width; + uint16_t height; + uint32_t filesize; + uint32_t frames; + uint32_t taboffset; + uint16_t bits; + uint16_t channels; + uint32_t framesize; + uint32_t currentframe; + int64_t pts; + uint32_t superchunk_remaining; + AVPacket vpkt; +} Hnm4DemuxContext; + +static int hnm_probe(AVProbeData *p) +{ + if (p->buf_size < 4) + return 0; + + // check for HNM4 header. + // currently only HNM v4/v4A is supported + if (AV_RL32(&p->buf[0]) == HNM4_TAG) + return AVPROBE_SCORE_MAX; + + return 0; +} + +static int hnm_read_header(AVFormatContext *s) +{ + Hnm4DemuxContext *hnm = s->priv_data; + AVIOContext *pb = s->pb; + AVStream *vst; + + /* default context members */ + hnm->pts = 0; + av_init_packet(&hnm->vpkt); + hnm->vpkt.data = NULL; + hnm->vpkt.size = 0; + + hnm->superchunk_remaining = 0; + + avio_skip(pb, 8); + hnm->width = avio_rl16(pb); + hnm->height = avio_rl16(pb); + hnm->filesize = avio_rl32(pb); + hnm->frames = avio_rl32(pb); + hnm->taboffset = avio_rl32(pb); + hnm->bits = avio_rl16(pb); + hnm->channels = avio_rl16(pb); + hnm->framesize = avio_rl32(pb); + avio_skip(pb, 32); + + hnm->currentframe = 0; + + if (hnm->width < 320 || hnm->width > 640 || + hnm->height < 150 || hnm->height > 480) { + av_log(s, AV_LOG_ERROR, + "invalid resolution: %ux%u\n", hnm->width, hnm->height); + return AVERROR_INVALIDDATA; + } + + // TODO: find a better way to detect HNM4A + if (hnm->width == 640) + hnm->version = 0x4a; + else + hnm->version = 0x40; + + if (!(vst = avformat_new_stream(s, NULL))) + return AVERROR(ENOMEM); + + vst->codec->codec_type = AVMEDIA_TYPE_VIDEO; + vst->codec->codec_id = AV_CODEC_ID_HNM4_VIDEO; + vst->codec->codec_tag = 0; + vst->codec->width = hnm->width; + vst->codec->height = hnm->height; + vst->codec->extradata = av_mallocz(1); + + vst->codec->extradata_size = 1; + memcpy(vst->codec->extradata, &hnm->version, 1); + + vst->start_time = 0; + + avpriv_set_pts_info(vst, 33, 1, HNM4_FRAME_FPS); + + return 0; +} + +static int hnm_read_packet(AVFormatContext *s, AVPacket *pkt) +{ + Hnm4DemuxContext *hnm = s->priv_data; + AVIOContext *pb = s->pb; + int ret = 0; + + uint32_t superchunk_size, chunk_size; + uint16_t chunk_id; + + if (hnm->currentframe == hnm->frames || pb->eof_reached) + return AVERROR_EOF; + + if (hnm->superchunk_remaining == 0) { + /* parse next superchunk */ + superchunk_size = avio_rl24(pb); + avio_skip(pb, 1); + + hnm->superchunk_remaining = superchunk_size - 4; + } + + chunk_size = avio_rl24(pb); + avio_skip(pb, 1); + chunk_id = avio_rl16(pb); + avio_skip(pb, 2); + + if (chunk_size > hnm->superchunk_remaining) { + av_log(s, AV_LOG_ERROR, "invalid chunk size: %u, offset: %u\n", + chunk_size, (int) avio_tell(pb)); + avio_skip(pb, hnm->superchunk_remaining - 8); + hnm->superchunk_remaining = 0; + } + + switch (chunk_id) { + case HNM4_CHUNK_ID_PL: + case HNM4_CHUNK_ID_IZ: + case HNM4_CHUNK_ID_IU: + avio_seek(pb, -8, SEEK_CUR); + ret += av_get_packet(pb, pkt, chunk_size); + hnm->superchunk_remaining -= chunk_size; + if (chunk_id == HNM4_CHUNK_ID_IZ || chunk_id == HNM4_CHUNK_ID_IU) + hnm->currentframe++; + break; + + case HNM4_CHUNK_ID_SD: + avio_skip(pb, chunk_size - 8); + hnm->superchunk_remaining -= chunk_size; + break; + + default: + av_log(s, AV_LOG_WARNING, "unknown chunk found: %d, offset: %d\n", + chunk_id, (int) avio_tell(pb)); + avio_skip(pb, chunk_size - 8); + hnm->superchunk_remaining -= chunk_size; + break; + } + + return ret; +} + +static int hnm_read_close(AVFormatContext *s) +{ + Hnm4DemuxContext *hnm = s->priv_data; + + if (hnm->vpkt.size > 0) + av_free_packet(&hnm->vpkt); + + return 0; +} + +AVInputFormat ff_hnm_demuxer = { + .name = "hnm", + .long_name = NULL_IF_CONFIG_SMALL("Cryo HNM v4"), + .priv_data_size = sizeof(Hnm4DemuxContext), + .read_probe = hnm_probe, + .read_header = hnm_read_header, + .read_packet = hnm_read_packet, + .read_close = hnm_read_close, + .flags = AVFMT_NO_BYTE_SEEK | AVFMT_NOGENSEARCH | AVFMT_NOBINSEARCH +}; |