From 183132872a1d8bc8a32e7fd8f994fa2f1b2d6bfc Mon Sep 17 00:00:00 2001 From: Sebastian Vater Date: Wed, 20 Apr 2011 13:56:56 +0200 Subject: HAM6/HAM8 support for IFF demuxer/decoder Signed-off-by: Michael Niedermayer --- libavcodec/iff.c | 276 ++++++++++++++++++++++++++++++++++++++++++++++++++++--- 1 file changed, 262 insertions(+), 14 deletions(-) (limited to 'libavcodec/iff.c') diff --git a/libavcodec/iff.c b/libavcodec/iff.c index e64ce1eeb6..2467781537 100644 --- a/libavcodec/iff.c +++ b/libavcodec/iff.c @@ -30,10 +30,72 @@ #include "avcodec.h" #include "get_bits.h" +// TODO: masking bits +typedef enum { + MASK_NONE, + MASK_HAS_MASK, + MASK_HAS_TRANSPARENT_COLOR, + MASK_LASSO +} mask_type; + +/** + * Gets the actual extra data after video preperties which contains + * the raw CMAP palette data beyond the IFF extra context. + * + * @param avctx the AVCodecContext where to extract raw palette data from + * @return pointer to raw CMAP palette data + */ +static av_always_inline uint8_t *get_palette_data(const AVCodecContext *const avctx) { + return avctx->extradata + AV_RB16(avctx->extradata); +} + +/** + * Gets the size of CMAP palette data beyond the IFF extra context. + * Please note that any value < 2 of IFF extra context or + * raw extradata < 0 is considered as illegal extradata. + * + * @param avctx the AVCodecContext where to extract palette data size from + * @return size of raw palette data in bytes + */ +static av_always_inline int get_palette_size(const AVCodecContext *const avctx) { + return avctx->extradata_size - AV_RB16(avctx->extradata); +} + +/** + * Gets the actual raw image data after video properties which + * contains the raw image data beyond the IFF extra context. + * + * @param avpkt the AVPacket where to extract raw image data from + * @return pointer to raw image data + */ +static av_always_inline uint8_t *get_image_data(const AVPacket *const avpkt) { + return avpkt->data + AV_RB16(avpkt->data); +} + +/** + * Gets the size of raw image data beyond the IFF extra context. + * Please note that any value < 2 of either IFF extra context + * or raw image data is considered as an illegal packet. + * + * @param avpkt the AVPacket where to extract image data size from + * @return size of raw image data in bytes + */ +static av_always_inline int get_image_size(const AVPacket *const avpkt) { + return avpkt->size - AV_RB16(avpkt->data); +} + typedef struct { AVFrame frame; int planesize; uint8_t * planebuf; + uint8_t * ham_buf; ///< temporary buffer for planar to chunky conversation + uint32_t *ham_palbuf; ///< HAM decode table + 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; ///< TODO: transparency color index in palette + unsigned masking; ///< TODO: masking method used int init; // 1 if buffer and palette data already initialized, 0 otherwise } IffContext; @@ -122,6 +184,7 @@ static av_always_inline uint32_t gray2rgb(const uint32_t x) { static int ff_cmap_read_palette(AVCodecContext *avctx, uint32_t *pal) { int count, i; + const uint8_t *const extradata = get_palette_data(avctx); if (avctx->bits_per_coded_sample > 8) { av_log(avctx, AV_LOG_ERROR, "bit_per_coded_sample > 8 not supported\n"); @@ -130,10 +193,10 @@ static int ff_cmap_read_palette(AVCodecContext *avctx, uint32_t *pal) count = 1 << avctx->bits_per_coded_sample; // If extradata is smaller than actually needed, fill the remaining with black. - count = FFMIN(avctx->extradata_size / 3, count); + count = FFMIN(get_palette_size(avctx) / 3, count); if (count) { for (i=0; i < count; i++) { - pal[i] = 0xFF000000 | AV_RB24( avctx->extradata + i*3 ); + pal[i] = 0xFF000000 | AV_RB24(extradata + i*3); } } else { // Create gray-scale color palette for bps < 8 count = 1 << avctx->bits_per_coded_sample; @@ -145,15 +208,123 @@ static int ff_cmap_read_palette(AVCodecContext *avctx, uint32_t *pal) return 0; } +/** + * Extracts the IFF extra context and updates internal + * decoder structures. + * + * @param avctx the AVCodecContext where to extract extra context to + * @param avpkt the AVPacket to extract extra context from or NULL to use avctx + * @return 0 in case of success, a negative error code otherwise + */ +static int extract_header(AVCodecContext *const avctx, + const AVPacket *const avpkt) { + const uint8_t *buf; + unsigned buf_size; + IffContext *s = avctx->priv_data; + if (avpkt) { + if (avpkt->size < 2) + return AVERROR_INVALIDDATA; + buf = avpkt->data; + buf_size = bytestream_get_be16(&buf); + if (buf_size <= 1 || get_image_size(avpkt) <= 1) { + av_log(avctx, AV_LOG_ERROR, + "Invalid image size received: %u -> image data offset: %d\n", + buf_size, get_image_size(avpkt)); + return AVERROR_INVALIDDATA; + } + } else { + if (avctx->extradata_size < 2) + return AVERROR_INVALIDDATA; + buf = avctx->extradata; + buf_size = bytestream_get_be16(&buf); + if (buf_size <= 1 || get_palette_size(avctx) < 0) { + av_log(avctx, AV_LOG_ERROR, + "Invalid palette size received: %u -> palette data offset: %d\n", + buf_size, get_palette_size(avctx)); + return AVERROR_INVALIDDATA; + } + } + + if (buf_size > 8) { + s->compression = bytestream_get_byte(&buf); + s->bpp = bytestream_get_byte(&buf); + s->ham = bytestream_get_byte(&buf); + s->flags = bytestream_get_byte(&buf); + s->transparency = bytestream_get_be16(&buf); + s->masking = bytestream_get_byte(&buf); + if (s->masking == MASK_HAS_TRANSPARENT_COLOR) { + av_log(avctx, AV_LOG_ERROR, "Transparency not supported\n"); + return AVERROR_PATCHWELCOME; + } else if (s->masking != MASK_NONE) { + av_log(avctx, AV_LOG_ERROR, "Masking not supported\n"); + return AVERROR_PATCHWELCOME; + } + if (!s->bpp || s->bpp > 32) { + av_log(avctx, AV_LOG_ERROR, "Invalid number of bitplanes: %u\n", s->bpp); + return AVERROR_INVALIDDATA; + } else if (s->ham >= 8) { + av_log(avctx, AV_LOG_ERROR, "Invalid number of hold bits for HAM: %u\n", s->ham); + return AVERROR_INVALIDDATA; + } + + av_freep(&s->ham_buf); + av_freep(&s->ham_palbuf); + + if (s->ham) { + int i, count = FFMIN(get_palette_size(avctx) / 3, 1 << s->ham); + const uint8_t *const extradata = get_palette_data(avctx); + s->ham_buf = av_malloc((s->planesize * 8) + FF_INPUT_BUFFER_PADDING_SIZE); + if (!s->ham_buf) + return AVERROR(ENOMEM); + + s->ham_palbuf = av_malloc((8 * (1 << s->ham) * sizeof (uint32_t)) + FF_INPUT_BUFFER_PADDING_SIZE); + if (!s->ham_palbuf) { + av_freep(&s->ham_buf); + return AVERROR(ENOMEM); + } + + if (count) { // HAM with color palette attached + // prefill with black and palette and set HAM take direct value mask to zero + memset(s->ham_palbuf, 0, (1 << s->ham) * 2 * sizeof (uint32_t)); + for (i=0; i < count; i++) { + s->ham_palbuf[i*2+1] = AV_RL24(extradata + i*3); + } + count = 1 << s->ham; + } else { // HAM with grayscale color palette + count = 1 << s->ham; + for (i=0; i < count; i++) { + s->ham_palbuf[i*2] = 0; // take direct color value from palette + s->ham_palbuf[i*2+1] = av_le2ne32(gray2rgb((i * 255) >> s->ham)); + } + } + for (i=0; i < count; i++) { + uint32_t tmp = i << (8 - s->ham); + tmp |= tmp >> s->ham; + s->ham_palbuf[(i+count)*2] = 0x00FFFF; // just modify blue color component + s->ham_palbuf[(i+count*2)*2] = 0xFFFF00; // just modify red color component + s->ham_palbuf[(i+count*3)*2] = 0xFF00FF; // just modify green color component + s->ham_palbuf[(i+count)*2+1] = tmp << 16; + s->ham_palbuf[(i+count*2)*2+1] = tmp; + s->ham_palbuf[(i+count*3)*2+1] = tmp << 8; + } + } else if (s->flags & 1) { // EHB (ExtraHalfBrite) color palette + av_log(avctx, AV_LOG_ERROR, "ExtraHalfBrite (EHB) mode not supported\n"); + return AVERROR_PATCHWELCOME; + } + } + + return 0; +} + static av_cold int decode_init(AVCodecContext *avctx) { IffContext *s = avctx->priv_data; int err; if (avctx->bits_per_coded_sample <= 8) { - avctx->pix_fmt = (avctx->bits_per_coded_sample < 8 || - avctx->extradata_size) ? PIX_FMT_PAL8 - : PIX_FMT_GRAY8; + avctx->pix_fmt = (avctx->bits_per_coded_sample < 8) || + (avctx->extradata_size >= 2 && get_palette_size(avctx)) ? PIX_FMT_PAL8 + : PIX_FMT_GRAY8; } else if (avctx->bits_per_coded_sample <= 32) { avctx->pix_fmt = PIX_FMT_BGR32; } else { @@ -167,6 +338,10 @@ static av_cold int decode_init(AVCodecContext *avctx) if (!s->planebuf) return AVERROR(ENOMEM); + s->bpp = avctx->bits_per_coded_sample; + + if ((err = extract_header(avctx, NULL)) < 0) + return err; s->frame.reference = 1; return 0; @@ -214,6 +389,39 @@ static void decodeplane32(uint32_t *dst, const uint8_t *buf, int buf_size, int p } while (--buf_size); } +#define DECODE_HAM_PLANE32(x) \ + first = buf[x] << 1; \ + second = buf[(x)+1] << 1; \ + delta &= pal[first++]; \ + delta |= pal[first]; \ + dst[x] = delta; \ + delta &= pal[second++]; \ + delta |= pal[second]; \ + dst[(x)+1] = delta + +/** + * Converts one line of HAM6/8-encoded chunky buffer to 24bpp. + * + * @param dst the destination 24bpp buffer + * @param buf the source 8bpp chunky buffer + * @param pal the HAM decode table + * @param buf_size the plane size in bytes + */ +static void decode_ham_plane32(uint32_t *dst, const uint8_t *buf, + const uint32_t *const pal, unsigned buf_size) +{ + uint32_t delta = 0; + do { + uint32_t first, second; + DECODE_HAM_PLANE32(0); + DECODE_HAM_PLANE32(2); + DECODE_HAM_PLANE32(4); + DECODE_HAM_PLANE32(6); + buf += 8; + dst += 8; + } while (--buf_size); +} + /** * Decode one complete byterun1 encoded line. * @@ -250,11 +458,14 @@ static int decode_frame_ilbm(AVCodecContext *avctx, AVPacket *avpkt) { IffContext *s = avctx->priv_data; - const uint8_t *buf = avpkt->data; - int buf_size = avpkt->size; + const uint8_t *buf = avpkt->size >= 2 ? get_image_data(avpkt) : NULL; + const int buf_size = avpkt->size >= 2 ? get_image_size(avpkt) : 0; const uint8_t *buf_end = buf+buf_size; int y, plane, res; + if ((res = extract_header(avctx, avpkt)) < 0) + return res; + if (s->init) { if ((res = avctx->reget_buffer(avctx, &s->frame)) < 0) { av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n"); @@ -274,16 +485,26 @@ static int decode_frame_ilbm(AVCodecContext *avctx, for(y = 0; y < avctx->height; y++ ) { uint8_t *row = &s->frame.data[0][ y*s->frame.linesize[0] ]; memset(row, 0, avctx->width); - for (plane = 0; plane < avctx->bits_per_coded_sample && buf < buf_end; plane++) { + for (plane = 0; plane < s->bpp && buf < buf_end; plane++) { decodeplane8(row, buf, FFMIN(s->planesize, buf_end - buf), plane); buf += s->planesize; } } + } else if (s->ham) { // HAM to PIX_FMT_BGR32 + for (y = 0; y < avctx->height; y++) { + uint8_t *row = &s->frame.data[0][ y*s->frame.linesize[0] ]; + memset(s->ham_buf, 0, avctx->width); + for (plane = 0; plane < s->bpp && buf < buf_end; plane++) { + decodeplane8(s->ham_buf, buf, FFMIN(s->planesize, buf_end - buf), plane); + buf += s->planesize; + } + decode_ham_plane32((uint32_t *) row, s->ham_buf, s->ham_palbuf, s->planesize); + } } else { // PIX_FMT_BGR32 for(y = 0; y < avctx->height; y++ ) { uint8_t *row = &s->frame.data[0][y*s->frame.linesize[0]]; memset(row, 0, avctx->width << 2); - for (plane = 0; plane < avctx->bits_per_coded_sample && buf < buf_end; plane++) { + for (plane = 0; plane < s->bpp && buf < buf_end; plane++) { decodeplane32((uint32_t *) row, buf, FFMIN(s->planesize, buf_end - buf), plane); buf += s->planesize; } @@ -295,6 +516,13 @@ static int decode_frame_ilbm(AVCodecContext *avctx, memcpy(row, buf, FFMIN(avctx->width, buf_end - buf)); buf += avctx->width + (avctx->width % 2); // padding if odd } + } else { // IFF-PBM: HAM to PIX_FMT_BGR32 + for (y = 0; y < avctx->height; y++) { + uint8_t *row = &s->frame.data[0][ y*s->frame.linesize[0] ]; + memcpy(s->ham_buf, buf, FFMIN(avctx->width, buf_end - buf)); + buf += avctx->width + (avctx->width & 1); // padding if odd + decode_ham_plane32((uint32_t *) row, s->ham_buf, s->ham_palbuf, avctx->width); + } } *data_size = sizeof(AVFrame); @@ -307,11 +535,13 @@ static int decode_frame_byterun1(AVCodecContext *avctx, AVPacket *avpkt) { IffContext *s = avctx->priv_data; - const uint8_t *buf = avpkt->data; - int buf_size = avpkt->size; + const uint8_t *buf = avpkt->size >= 2 ? get_image_data(avpkt) : NULL; + const int buf_size = avpkt->size >= 2 ? get_image_size(avpkt) : 0; const uint8_t *buf_end = buf+buf_size; int y, plane, res; + if ((res = extract_header(avctx, avpkt)) < 0) + return res; if (s->init) { if ((res = avctx->reget_buffer(avctx, &s->frame)) < 0) { av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n"); @@ -331,26 +561,42 @@ static int decode_frame_byterun1(AVCodecContext *avctx, for(y = 0; y < avctx->height ; y++ ) { uint8_t *row = &s->frame.data[0][ y*s->frame.linesize[0] ]; memset(row, 0, avctx->width); - for (plane = 0; plane < avctx->bits_per_coded_sample; plane++) { + for (plane = 0; plane < s->bpp; plane++) { buf += decode_byterun(s->planebuf, s->planesize, buf, buf_end); decodeplane8(row, s->planebuf, s->planesize, plane); } } + } else if (s->ham) { // HAM to PIX_FMT_BGR32 + for (y = 0; y < avctx->height ; y++) { + uint8_t *row = &s->frame.data[0][y*s->frame.linesize[0]]; + memset(s->ham_buf, 0, avctx->width); + for (plane = 0; plane < s->bpp; plane++) { + buf += decode_byterun(s->planebuf, s->planesize, buf, buf_end); + decodeplane8(s->ham_buf, s->planebuf, s->planesize, plane); + } + decode_ham_plane32((uint32_t *) row, s->ham_buf, s->ham_palbuf, s->planesize); + } } else { //PIX_FMT_BGR32 for(y = 0; y < avctx->height ; y++ ) { uint8_t *row = &s->frame.data[0][y*s->frame.linesize[0]]; memset(row, 0, avctx->width << 2); - for (plane = 0; plane < avctx->bits_per_coded_sample; plane++) { + for (plane = 0; plane < s->bpp; plane++) { buf += decode_byterun(s->planebuf, s->planesize, buf, buf_end); decodeplane32((uint32_t *) row, s->planebuf, s->planesize, plane); } } } - } else { + } else if (avctx->pix_fmt == PIX_FMT_PAL8 || avctx->pix_fmt == PIX_FMT_GRAY8) { // IFF-PBM for(y = 0; y < avctx->height ; y++ ) { uint8_t *row = &s->frame.data[0][y*s->frame.linesize[0]]; buf += decode_byterun(row, avctx->width, buf, buf_end); } + } else { // IFF-PBM: HAM to PIX_FMT_BGR32 + for (y = 0; y < avctx->height ; y++) { + uint8_t *row = &s->frame.data[0][y*s->frame.linesize[0]]; + buf += decode_byterun(s->ham_buf, avctx->width, buf, buf_end); + decode_ham_plane32((uint32_t *) row, s->ham_buf, s->ham_palbuf, avctx->width); + } } *data_size = sizeof(AVFrame); @@ -364,6 +610,8 @@ static av_cold int decode_end(AVCodecContext *avctx) if (s->frame.data[0]) avctx->release_buffer(avctx, &s->frame); av_freep(&s->planebuf); + av_freep(&s->ham_buf); + av_freep(&s->ham_palbuf); return 0; } -- cgit v1.2.3