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author | Paul B Mahol <onemda@gmail.com> | 2012-07-08 00:04:46 +0000 |
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committer | Paul B Mahol <onemda@gmail.com> | 2012-07-11 20:46:56 +0000 |
commit | 74f3c53b575cf275d87c0a0d3c74d79889a4493d (patch) | |
tree | 169cca1e6e035460f2265ae8fe7185f57c25488b /libavcodec/exr.c | |
parent | 5ee41d00f6bc7cb85fd8f7e5cbae184fdf9099c5 (diff) | |
download | ffmpeg-streaming-74f3c53b575cf275d87c0a0d3c74d79889a4493d.zip ffmpeg-streaming-74f3c53b575cf275d87c0a0d3c74d79889a4493d.tar.gz |
exr: zip decompression
Signed-off-by: Paul B Mahol <onemda@gmail.com>
Diffstat (limited to 'libavcodec/exr.c')
-rw-r--r-- | libavcodec/exr.c | 186 |
1 files changed, 148 insertions, 38 deletions
diff --git a/libavcodec/exr.c b/libavcodec/exr.c index 2628a8c..184687e 100644 --- a/libavcodec/exr.c +++ b/libavcodec/exr.c @@ -30,6 +30,8 @@ * exr_flt2uint() and exr_halflt2uint() is credited to Reimar Döffinger */ +#include <zlib.h> + #include "avcodec.h" #include "bytestream.h" #include "libavutil/imgutils.h" @@ -40,7 +42,8 @@ enum ExrCompr { EXR_ZIP1 = 2, EXR_ZIP16 = 3, EXR_PIZ = 4, - EXR_B44 = 6 + EXR_B44 = 6, + EXR_B44A = 7, }; typedef struct EXRContext { @@ -48,6 +51,12 @@ typedef struct EXRContext { int compr; int bits_per_color_id; int8_t channel_offsets[4]; // 0 = red, 1 = green, 2 = blue and 3 = alpha + + uint8_t *uncompressed_data; + int uncompressed_size; + + uint8_t *tmp; + int tmp_size;; } EXRContext; /** @@ -142,6 +151,38 @@ static int check_header_variable(AVCodecContext *avctx, return -1; } +static void predictor(uint8_t *src, int size) +{ + uint8_t *t = src + 1; + uint8_t *stop = src + size; + + while (t < stop) { + int d = (int)t[-1] + (int)t[0] - 128; + t[0] = d; + ++t; + } +} + +static void reorder_pixels(uint8_t *src, uint8_t *dst, int size) +{ + const int8_t *t1 = src; + const int8_t *t2 = src + (size + 1) / 2; + int8_t *s = dst; + int8_t *stop = s + size; + + while (1) { + if (s < stop) + *(s++) = *(t1++); + else + break; + + if (s < stop) + *(s++) = *(t2++); + else + break; + } +} + static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, @@ -165,6 +206,10 @@ static int decode_frame(AVCodecContext *avctx, unsigned int ymax = ~0; unsigned int xdelta = ~0; + int scan_lines_per_block; + unsigned long scan_line_size; + unsigned long uncompressed_size; + unsigned int current_channel_offset = 0; s->channel_offsets[0] = -1; @@ -319,10 +364,10 @@ static int decode_frame(AVCodecContext *avctx, s->compr = *buf; switch (s->compr) { case EXR_RAW: - break; - case EXR_RLE: case EXR_ZIP1: case EXR_ZIP16: + break; + case EXR_RLE: case EXR_PIZ: case EXR_B44: default: @@ -382,6 +427,16 @@ static int decode_frame(AVCodecContext *avctx, return AVERROR_INVALIDDATA; } + switch (s->compr) { + case EXR_RAW: + case EXR_ZIP1: + scan_lines_per_block = 1; + break; + case EXR_ZIP16: + scan_lines_per_block = 16; + break; + } + if (s->picture.data[0]) avctx->release_buffer(avctx, &s->picture); if (av_image_check_size(w, h, 0, avctx)) @@ -397,6 +452,16 @@ static int decode_frame(AVCodecContext *avctx, avcodec_set_dimensions(avctx, w, h); } + scan_line_size = xdelta * av_pix_fmt_descriptors[avctx->pix_fmt].nb_components * FFMAX(2 * s->bits_per_color_id, 1); + uncompressed_size = scan_line_size * scan_lines_per_block; + + if (s->compr != EXR_RAW) { + av_fast_padded_malloc(&s->uncompressed_data, &s->uncompressed_size, uncompressed_size); + av_fast_padded_malloc(&s->tmp, &s->tmp_size, uncompressed_size); + if (!s->uncompressed_data || !s->tmp) + return AVERROR(ENOMEM); + } + if ((ret = avctx->get_buffer(avctx, p)) < 0) { av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n"); return ret; @@ -411,55 +476,94 @@ static int decode_frame(AVCodecContext *avctx, ptr += stride; } - // Process the actual lines - for (y = ymin; y <= ymax; y++) { + // Process the actual scan line blocks + for (y = ymin; y <= ymax; y += scan_lines_per_block) { uint16_t *ptr_x = (uint16_t *)ptr; if (buf_end - buf > 8) { /* Read the lineoffset from the line offset table and add 8 bytes to skip the coordinates and data size fields */ const uint64_t line_offset = bytestream_get_le64(&buf) + 8; + int32_t data_size; + // Check if the buffer has the required bytes needed from the offset - if (line_offset > avpkt->size - xdelta * current_channel_offset) { + if ((line_offset > buf_size) || + (s->compr == EXR_RAW && line_offset > avpkt->size - xdelta * current_channel_offset) || + (s->compr != EXR_RAW && line_offset > buf_size - (data_size = AV_RL32(avpkt->data + line_offset - 4)))) { // Line offset is probably wrong and not inside the buffer av_log(avctx, AV_LOG_WARNING, "Line offset for line %d is out of reach setting it to black\n", y); - memset(ptr_x, 0, avctx->width * 2 * av_pix_fmt_descriptors[avctx->pix_fmt].nb_components); + for (i = 0; i < scan_lines_per_block && y + i <= ymax; i++, ptr += stride) { + ptr_x = (uint16_t *)ptr; + memset(ptr_x, 0, avctx->width * 2 * av_pix_fmt_descriptors[avctx->pix_fmt].nb_components); + } } else { - const uint8_t *red_channel_buffer = avpkt->data + line_offset + xdelta * s->channel_offsets[0]; - const uint8_t *green_channel_buffer = avpkt->data + line_offset + xdelta * s->channel_offsets[1]; - const uint8_t *blue_channel_buffer = avpkt->data + line_offset + xdelta * s->channel_offsets[2]; - const uint8_t *alpha_channel_buffer = 0; - - if (s->channel_offsets[3] >= 0) - alpha_channel_buffer = avpkt->data + line_offset + xdelta * s->channel_offsets[3]; - - // Zero out the start if xmin is not 0 - memset(ptr_x, 0, xmin * 2 * av_pix_fmt_descriptors[avctx->pix_fmt].nb_components); - ptr_x += xmin * av_pix_fmt_descriptors[avctx->pix_fmt].nb_components; - if (s->bits_per_color_id == 2) { - // 32-bit - for (x = 0; x < xdelta; x++) { - *ptr_x++ = exr_flt2uint(bytestream_get_le32(&red_channel_buffer)); - *ptr_x++ = exr_flt2uint(bytestream_get_le32(&green_channel_buffer)); - *ptr_x++ = exr_flt2uint(bytestream_get_le32(&blue_channel_buffer)); - if (alpha_channel_buffer) - *ptr_x++ = exr_flt2uint(bytestream_get_le32(&alpha_channel_buffer)); + const uint8_t *red_channel_buffer, *green_channel_buffer, *blue_channel_buffer, *alpha_channel_buffer = 0; + + if ((s->compr == EXR_ZIP1 || s->compr == EXR_ZIP16) && data_size < uncompressed_size) { + if (uncompress(s->tmp, &uncompressed_size, avpkt->data + line_offset, data_size) != Z_OK) { + av_log(avctx, AV_LOG_ERROR, "error during zlib decompression\n"); + return AVERROR(EINVAL); } + + predictor(s->tmp, uncompressed_size); + reorder_pixels(s->tmp, s->uncompressed_data, uncompressed_size); + + red_channel_buffer = s->uncompressed_data + xdelta * s->channel_offsets[0]; + green_channel_buffer = s->uncompressed_data + xdelta * s->channel_offsets[1]; + blue_channel_buffer = s->uncompressed_data + xdelta * s->channel_offsets[2]; + if (s->channel_offsets[3] >= 0) + alpha_channel_buffer = s->uncompressed_data + xdelta * s->channel_offsets[3]; } else { - // 16-bit - for (x = 0; x < xdelta; x++) { - *ptr_x++ = exr_halflt2uint(bytestream_get_le16(&red_channel_buffer)); - *ptr_x++ = exr_halflt2uint(bytestream_get_le16(&green_channel_buffer)); - *ptr_x++ = exr_halflt2uint(bytestream_get_le16(&blue_channel_buffer)); - if (alpha_channel_buffer) - *ptr_x++ = exr_halflt2uint(bytestream_get_le16(&alpha_channel_buffer)); - } + red_channel_buffer = avpkt->data + line_offset + xdelta * s->channel_offsets[0]; + green_channel_buffer = avpkt->data + line_offset + xdelta * s->channel_offsets[1]; + blue_channel_buffer = avpkt->data + line_offset + xdelta * s->channel_offsets[2]; + if (s->channel_offsets[3] >= 0) + alpha_channel_buffer = avpkt->data + line_offset + xdelta * s->channel_offsets[3]; } - // Zero out the end if xmax+1 is not w - memset(ptr_x, 0, (avctx->width - (xmax + 1)) * 2 * av_pix_fmt_descriptors[avctx->pix_fmt].nb_components); + for (i = 0; i < scan_lines_per_block && y + i <= ymax; i++, ptr += stride) { + const uint8_t *r, *g, *b, *a; + + r = red_channel_buffer; + g = green_channel_buffer; + b = blue_channel_buffer; + if (alpha_channel_buffer) + a = alpha_channel_buffer; + + ptr_x = (uint16_t *)ptr; + + // Zero out the start if xmin is not 0 + memset(ptr_x, 0, xmin * 2 * av_pix_fmt_descriptors[avctx->pix_fmt].nb_components); + ptr_x += xmin * av_pix_fmt_descriptors[avctx->pix_fmt].nb_components; + if (s->bits_per_color_id == 2) { + // 32-bit + for (x = 0; x < xdelta; x++) { + *ptr_x++ = exr_flt2uint(bytestream_get_le32(&r)); + *ptr_x++ = exr_flt2uint(bytestream_get_le32(&g)); + *ptr_x++ = exr_flt2uint(bytestream_get_le32(&b)); + if (alpha_channel_buffer) + *ptr_x++ = exr_flt2uint(bytestream_get_le32(&a)); + } + } else { + // 16-bit + for (x = 0; x < xdelta; x++) { + *ptr_x++ = exr_halflt2uint(bytestream_get_le16(&r)); + *ptr_x++ = exr_halflt2uint(bytestream_get_le16(&g)); + *ptr_x++ = exr_halflt2uint(bytestream_get_le16(&b)); + if (alpha_channel_buffer) + *ptr_x++ = exr_halflt2uint(bytestream_get_le16(&a)); + } + } + + // Zero out the end if xmax+1 is not w + memset(ptr_x, 0, (avctx->width - (xmax + 1)) * 2 * av_pix_fmt_descriptors[avctx->pix_fmt].nb_components); + + red_channel_buffer += scan_line_size; + green_channel_buffer += scan_line_size; + blue_channel_buffer += scan_line_size; + if (alpha_channel_buffer) + alpha_channel_buffer += scan_line_size; + } } - // Move to next line - ptr += stride; } } @@ -478,17 +582,23 @@ static int decode_frame(AVCodecContext *avctx, static av_cold int decode_init(AVCodecContext *avctx) { EXRContext *s = avctx->priv_data; + avcodec_get_frame_defaults(&s->picture); avctx->coded_frame = &s->picture; + return 0; } static av_cold int decode_end(AVCodecContext *avctx) { EXRContext *s = avctx->priv_data; + if (s->picture.data[0]) avctx->release_buffer(avctx, &s->picture); + av_freep(&s->uncompressed_data); + av_freep(&s->tmp); + return 0; } |