diff options
author | Sebastian Vater <cdgs.basty@googlemail.com> | 2011-04-20 13:56:56 +0200 |
---|---|---|
committer | Michael Niedermayer <michaelni@gmx.at> | 2011-04-24 12:45:19 +0200 |
commit | 183132872a1d8bc8a32e7fd8f994fa2f1b2d6bfc (patch) | |
tree | 71158e36dd5936690b9a17a431ef89551fdc2fe4 /libavformat | |
parent | c2a8f125855aef72efcde8a06dd73a5fbe5dcf25 (diff) |
HAM6/HAM8 support for IFF demuxer/decoder
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
Diffstat (limited to 'libavformat')
-rw-r--r-- | libavformat/iff.c | 78 |
1 files changed, 71 insertions, 7 deletions
diff --git a/libavformat/iff.c b/libavformat/iff.c index 24942122ad..da4e858501 100644 --- a/libavformat/iff.c +++ b/libavformat/iff.c @@ -29,6 +29,7 @@ * http://wiki.multimedia.cx/index.php?title=IFF */ +#include "libavcodec/bytestream.h" #include "libavutil/intreadwrite.h" #include "avformat.h" @@ -40,6 +41,7 @@ #define ID_PBM MKTAG('P','B','M',' ') #define ID_ILBM MKTAG('I','L','B','M') #define ID_BMHD MKTAG('B','M','H','D') +#define ID_CAMG MKTAG('C','A','M','G') #define ID_CMAP MKTAG('C','M','A','P') #define ID_FORM MKTAG('F','O','R','M') @@ -60,6 +62,16 @@ #define PACKET_SIZE 1024 +/** + * This number of bytes if added at the beginning of each AVPacket + * which contain additional information about video properties + * which has to be shared between demuxer and decoder. + * This number may change between frames, e.g. the demuxer might + * set it to smallest possible size of 2 to indicate that there's + * no extradata changing in this frame. + */ +#define IFF_EXTRA_VIDEO_SIZE 9 + typedef enum { COMP_NONE, COMP_FIB, @@ -76,6 +88,12 @@ typedef struct { uint32_t body_size; uint32_t sent_bytes; uint32_t audio_frame_count; + unsigned compression; ///< delta compression method used + unsigned bpp; ///< bits per plane to decode (differs from bits_per_coded_sample if HAM) + unsigned ham; ///< 0 if non-HAM or number of hold bits (6 for bpp > 6, 4 otherwise) + unsigned flags; ///< 1 for EHB, 0 is no extra half darkening + unsigned transparency; ///< transparency color index in palette + unsigned masking; ///< masking method used } IffDemuxContext; @@ -126,8 +144,12 @@ static int iff_read_header(AVFormatContext *s, IffDemuxContext *iff = s->priv_data; AVIOContext *pb = s->pb; AVStream *st; + uint8_t *buf; uint32_t chunk_id, data_size; int compression = -1; + uint32_t screenmode = 0; + unsigned transparency = 0; + unsigned masking = 0; // no mask st = av_new_stream(s, 0); if (!st) @@ -171,12 +193,18 @@ static int iff_read_header(AVFormatContext *s, st->codec->channels = (avio_rb32(pb) < 6) ? 1 : 2; break; + case ID_CAMG: + if (data_size < 4) + return AVERROR_INVALIDDATA; + screenmode = avio_rb32(pb); + break; + case ID_CMAP: - st->codec->extradata_size = data_size; - st->codec->extradata = av_malloc(data_size); + st->codec->extradata_size = data_size + IFF_EXTRA_VIDEO_SIZE; + st->codec->extradata = av_malloc(data_size + IFF_EXTRA_VIDEO_SIZE + FF_INPUT_BUFFER_PADDING_SIZE); if (!st->codec->extradata) return AVERROR(ENOMEM); - if (avio_read(pb, st->codec->extradata, data_size) < 0) + if (avio_read(pb, st->codec->extradata + IFF_EXTRA_VIDEO_SIZE, data_size) < 0) return AVERROR(EIO); break; @@ -188,12 +216,15 @@ static int iff_read_header(AVFormatContext *s, st->codec->height = avio_rb16(pb); avio_skip(pb, 4); // x, y offset st->codec->bits_per_coded_sample = avio_r8(pb); - if (data_size >= 11) { - avio_skip(pb, 1); // masking + if (data_size >= 10) + masking = avio_r8(pb); + if (data_size >= 11) compression = avio_r8(pb); + if (data_size >= 14) { + avio_skip(pb, 1); // padding + transparency = avio_rb16(pb); } if (data_size >= 16) { - avio_skip(pb, 3); // paddding, transparent st->sample_aspect_ratio.num = avio_r8(pb); st->sample_aspect_ratio.den = avio_r8(pb); } @@ -253,6 +284,31 @@ static int iff_read_header(AVFormatContext *s, break; case AVMEDIA_TYPE_VIDEO: + iff->compression = compression; + iff->bpp = st->codec->bits_per_coded_sample; + if ((screenmode & 0x800 /* Hold And Modify */) && iff->bpp <= 8) { + iff->ham = iff->bpp > 6 ? 6 : 4; + st->codec->bits_per_coded_sample = 24; + } + iff->flags = (screenmode & 0x80 /* Extra HalfBrite */) && iff->bpp <= 8; + iff->masking = masking; + iff->transparency = transparency; + + if (!st->codec->extradata) { + st->codec->extradata_size = IFF_EXTRA_VIDEO_SIZE; + st->codec->extradata = av_malloc(IFF_EXTRA_VIDEO_SIZE + FF_INPUT_BUFFER_PADDING_SIZE); + if (!st->codec->extradata) + return AVERROR(ENOMEM); + } + buf = st->codec->extradata; + bytestream_put_be16(&buf, IFF_EXTRA_VIDEO_SIZE); + bytestream_put_byte(&buf, iff->compression); + bytestream_put_byte(&buf, iff->bpp); + bytestream_put_byte(&buf, iff->ham); + bytestream_put_byte(&buf, iff->flags); + bytestream_put_be16(&buf, iff->transparency); + bytestream_put_byte(&buf, iff->masking); + switch (compression) { case BITMAP_RAW: st->codec->codec_id = CODEC_ID_IFF_ILBM; @@ -293,7 +349,15 @@ static int iff_read_packet(AVFormatContext *s, } interleave_stereo(sample_buffer, pkt->data, PACKET_SIZE); } else if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) { - ret = av_get_packet(pb, pkt, iff->body_size); + uint8_t *buf; + + if (av_new_packet(pkt, iff->body_size + 2) < 0) { + return AVERROR(ENOMEM); + } + + buf = pkt->data; + bytestream_put_be16(&buf, 2); + ret = avio_read(pb, buf, iff->body_size); } else { ret = av_get_packet(pb, pkt, PACKET_SIZE); } |