From b958a7f1114a49b0a0e36479ba96c83c4fe4c3b3 Mon Sep 17 00:00:00 2001 From: Måns Rullgård Date: Sun, 15 Jul 2007 18:24:26 +0000 Subject: separate en/decoder specific parts from png.c Originally committed as revision 9686 to svn://svn.ffmpeg.org/ffmpeg/trunk --- libavcodec/png.c | 872 +------------------------------------------------------ 1 file changed, 13 insertions(+), 859 deletions(-) (limited to 'libavcodec/png.c') diff --git a/libavcodec/png.c b/libavcodec/png.c index 5f9b1cdccd..2af7700630 100644 --- a/libavcodec/png.c +++ b/libavcodec/png.c @@ -20,127 +20,43 @@ */ #include "avcodec.h" #include "bytestream.h" +#include "png.h" -/* TODO: - * - add 2, 4 and 16 bit depth support - * - use filters when generating a png (better compression) - */ - -#include - -//#define DEBUG - -#define PNG_COLOR_MASK_PALETTE 1 -#define PNG_COLOR_MASK_COLOR 2 -#define PNG_COLOR_MASK_ALPHA 4 - -#define PNG_COLOR_TYPE_GRAY 0 -#define PNG_COLOR_TYPE_PALETTE (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_PALETTE) -#define PNG_COLOR_TYPE_RGB (PNG_COLOR_MASK_COLOR) -#define PNG_COLOR_TYPE_RGB_ALPHA (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_ALPHA) -#define PNG_COLOR_TYPE_GRAY_ALPHA (PNG_COLOR_MASK_ALPHA) - -#define PNG_FILTER_VALUE_NONE 0 -#define PNG_FILTER_VALUE_SUB 1 -#define PNG_FILTER_VALUE_UP 2 -#define PNG_FILTER_VALUE_AVG 3 -#define PNG_FILTER_VALUE_PAETH 4 - -#define PNG_IHDR 0x0001 -#define PNG_IDAT 0x0002 -#define PNG_ALLIMAGE 0x0004 -#define PNG_PLTE 0x0008 - -#define NB_PASSES 7 - -#define IOBUF_SIZE 4096 - -typedef struct PNGContext { - uint8_t *bytestream; - uint8_t *bytestream_start; - uint8_t *bytestream_end; - AVFrame picture; - - int state; - int width, height; - int bit_depth; - int color_type; - int compression_type; - int interlace_type; - int filter_type; - int channels; - int bits_per_pixel; - int bpp; - - uint8_t *image_buf; - int image_linesize; - uint32_t palette[256]; - uint8_t *crow_buf; - uint8_t *last_row; - uint8_t *tmp_row; - int pass; - int crow_size; /* compressed row size (include filter type) */ - int row_size; /* decompressed row size */ - int pass_row_size; /* decompress row size of the current pass */ - int y; - z_stream zstream; - uint8_t buf[IOBUF_SIZE]; -} PNGContext; - -static const uint8_t pngsig[8] = {137, 80, 78, 71, 13, 10, 26, 10}; +const uint8_t ff_pngsig[8] = {137, 80, 78, 71, 13, 10, 26, 10}; /* Mask to determine which y pixels are valid in a pass */ -static const uint8_t png_pass_ymask[NB_PASSES] = { +const uint8_t ff_png_pass_ymask[NB_PASSES] = { 0x80, 0x80, 0x08, 0x88, 0x22, 0xaa, 0x55, }; -/* Mask to determine which y pixels can be written in a pass */ -static const uint8_t png_pass_dsp_ymask[NB_PASSES] = { - 0xff, 0xff, 0x0f, 0xcc, 0x33, 0xff, 0x55, -}; - /* minimum x value */ -static const uint8_t png_pass_xmin[NB_PASSES] = { +const uint8_t ff_png_pass_xmin[NB_PASSES] = { 0, 4, 0, 2, 0, 1, 0 }; /* x shift to get row width */ -static const uint8_t png_pass_xshift[NB_PASSES] = { +const uint8_t ff_png_pass_xshift[NB_PASSES] = { 3, 3, 2, 2, 1, 1, 0 }; /* Mask to determine which pixels are valid in a pass */ -static const uint8_t png_pass_mask[NB_PASSES] = { +const uint8_t ff_png_pass_mask[NB_PASSES] = { 0x80, 0x08, 0x88, 0x22, 0xaa, 0x55, 0xff }; -/* Mask to determine which pixels to overwrite while displaying */ -static const uint8_t png_pass_dsp_mask[NB_PASSES] = { - 0xff, 0x0f, 0xff, 0x33, 0xff, 0x55, 0xff -}; -#if 0 -static int png_probe(AVProbeData *pd) -{ - if (pd->buf_size >= 8 && - memcmp(pd->buf, pngsig, 8) == 0) - return AVPROBE_SCORE_MAX; - else - return 0; -} -#endif -static void *png_zalloc(void *opaque, unsigned int items, unsigned int size) +void *ff_png_zalloc(void *opaque, unsigned int items, unsigned int size) { if(items >= UINT_MAX / size) return NULL; return av_malloc(items * size); } -static void png_zfree(void *opaque, void *ptr) +void ff_png_zfree(void *opaque, void *ptr) { av_free(ptr); } -static int png_get_nb_channels(int color_type) +int ff_png_get_nb_channels(int color_type) { int channels; channels = 1; @@ -153,580 +69,19 @@ static int png_get_nb_channels(int color_type) } /* compute the row size of an interleaved pass */ -static int png_pass_row_size(int pass, int bits_per_pixel, int width) +int ff_png_pass_row_size(int pass, int bits_per_pixel, int width) { int shift, xmin, pass_width; - xmin = png_pass_xmin[pass]; + xmin = ff_png_pass_xmin[pass]; if (width <= xmin) return 0; - shift = png_pass_xshift[pass]; + shift = ff_png_pass_xshift[pass]; pass_width = (width - xmin + (1 << shift) - 1) >> shift; return (pass_width * bits_per_pixel + 7) >> 3; } -/* NOTE: we try to construct a good looking image at each pass. width - is the original image width. We also do pixel format convertion at - this stage */ -static void png_put_interlaced_row(uint8_t *dst, int width, - int bits_per_pixel, int pass, - int color_type, const uint8_t *src) -{ - int x, mask, dsp_mask, j, src_x, b, bpp; - uint8_t *d; - const uint8_t *s; - - mask = png_pass_mask[pass]; - dsp_mask = png_pass_dsp_mask[pass]; - switch(bits_per_pixel) { - case 1: - /* we must initialize the line to zero before writing to it */ - if (pass == 0) - memset(dst, 0, (width + 7) >> 3); - src_x = 0; - for(x = 0; x < width; x++) { - j = (x & 7); - if ((dsp_mask << j) & 0x80) { - b = (src[src_x >> 3] >> (7 - (src_x & 7))) & 1; - dst[x >> 3] |= b << (7 - j); - } - if ((mask << j) & 0x80) - src_x++; - } - break; - default: - bpp = bits_per_pixel >> 3; - d = dst; - s = src; - if (color_type == PNG_COLOR_TYPE_RGB_ALPHA) { - for(x = 0; x < width; x++) { - j = x & 7; - if ((dsp_mask << j) & 0x80) { - *(uint32_t *)d = (s[3] << 24) | (s[0] << 16) | (s[1] << 8) | s[2]; - } - d += bpp; - if ((mask << j) & 0x80) - s += bpp; - } - } else { - for(x = 0; x < width; x++) { - j = x & 7; - if ((dsp_mask << j) & 0x80) { - memcpy(d, s, bpp); - } - d += bpp; - if ((mask << j) & 0x80) - s += bpp; - } - } - break; - } -} - -#ifdef CONFIG_ENCODERS -static void png_get_interlaced_row(uint8_t *dst, int row_size, - int bits_per_pixel, int pass, - const uint8_t *src, int width) -{ - int x, mask, dst_x, j, b, bpp; - uint8_t *d; - const uint8_t *s; - - mask = png_pass_mask[pass]; - switch(bits_per_pixel) { - case 1: - memset(dst, 0, row_size); - dst_x = 0; - for(x = 0; x < width; x++) { - j = (x & 7); - if ((mask << j) & 0x80) { - b = (src[x >> 3] >> (7 - j)) & 1; - dst[dst_x >> 3] |= b << (7 - (dst_x & 7)); - dst_x++; - } - } - break; - default: - bpp = bits_per_pixel >> 3; - d = dst; - s = src; - for(x = 0; x < width; x++) { - j = x & 7; - if ((mask << j) & 0x80) { - memcpy(d, s, bpp); - d += bpp; - } - s += bpp; - } - break; - } -} -#endif - -/* XXX: optimize */ -/* NOTE: 'dst' can be equal to 'last' */ -static void png_filter_row(uint8_t *dst, int filter_type, - uint8_t *src, uint8_t *last, int size, int bpp) -{ - int i, p; - - switch(filter_type) { - case PNG_FILTER_VALUE_NONE: - memcpy(dst, src, size); - break; - case PNG_FILTER_VALUE_SUB: - for(i = 0; i < bpp; i++) { - dst[i] = src[i]; - } - for(i = bpp; i < size; i++) { - p = dst[i - bpp]; - dst[i] = p + src[i]; - } - break; - case PNG_FILTER_VALUE_UP: - for(i = 0; i < size; i++) { - p = last[i]; - dst[i] = p + src[i]; - } - break; - case PNG_FILTER_VALUE_AVG: - for(i = 0; i < bpp; i++) { - p = (last[i] >> 1); - dst[i] = p + src[i]; - } - for(i = bpp; i < size; i++) { - p = ((dst[i - bpp] + last[i]) >> 1); - dst[i] = p + src[i]; - } - break; - case PNG_FILTER_VALUE_PAETH: - for(i = 0; i < bpp; i++) { - p = last[i]; - dst[i] = p + src[i]; - } - for(i = bpp; i < size; i++) { - int a, b, c, pa, pb, pc; - - a = dst[i - bpp]; - b = last[i]; - c = last[i - bpp]; - - p = b - c; - pc = a - c; - - pa = abs(p); - pb = abs(pc); - pc = abs(p + pc); - - if (pa <= pb && pa <= pc) - p = a; - else if (pb <= pc) - p = b; - else - p = c; - dst[i] = p + src[i]; - } - break; - } -} - -#ifdef CONFIG_ENCODERS -static void convert_from_rgb32(uint8_t *dst, const uint8_t *src, int width) -{ - uint8_t *d; - int j; - unsigned int v; - - d = dst; - for(j = 0; j < width; j++) { - v = ((const uint32_t *)src)[j]; - d[0] = v >> 16; - d[1] = v >> 8; - d[2] = v; - d[3] = v >> 24; - d += 4; - } -} -#endif - -#ifdef CONFIG_DECODERS -static void convert_to_rgb32(uint8_t *dst, const uint8_t *src, int width) -{ - int j; - unsigned int r, g, b, a; - - for(j = 0;j < width; j++) { - r = src[0]; - g = src[1]; - b = src[2]; - a = src[3]; - *(uint32_t *)dst = (a << 24) | (r << 16) | (g << 8) | b; - dst += 4; - src += 4; - } -} - -/* process exactly one decompressed row */ -static void png_handle_row(PNGContext *s) -{ - uint8_t *ptr, *last_row; - int got_line; - - if (!s->interlace_type) { - ptr = s->image_buf + s->image_linesize * s->y; - /* need to swap bytes correctly for RGB_ALPHA */ - if (s->color_type == PNG_COLOR_TYPE_RGB_ALPHA) { - png_filter_row(s->tmp_row, s->crow_buf[0], s->crow_buf + 1, - s->last_row, s->row_size, s->bpp); - memcpy(s->last_row, s->tmp_row, s->row_size); - convert_to_rgb32(ptr, s->tmp_row, s->width); - } else { - /* in normal case, we avoid one copy */ - if (s->y == 0) - last_row = s->last_row; - else - last_row = ptr - s->image_linesize; - - png_filter_row(ptr, s->crow_buf[0], s->crow_buf + 1, - last_row, s->row_size, s->bpp); - } - s->y++; - if (s->y == s->height) { - s->state |= PNG_ALLIMAGE; - } - } else { - got_line = 0; - for(;;) { - ptr = s->image_buf + s->image_linesize * s->y; - if ((png_pass_ymask[s->pass] << (s->y & 7)) & 0x80) { - /* if we already read one row, it is time to stop to - wait for the next one */ - if (got_line) - break; - png_filter_row(s->tmp_row, s->crow_buf[0], s->crow_buf + 1, - s->last_row, s->pass_row_size, s->bpp); - memcpy(s->last_row, s->tmp_row, s->pass_row_size); - got_line = 1; - } - if ((png_pass_dsp_ymask[s->pass] << (s->y & 7)) & 0x80) { - /* NOTE: RGB32 is handled directly in png_put_interlaced_row */ - png_put_interlaced_row(ptr, s->width, s->bits_per_pixel, s->pass, - s->color_type, s->last_row); - } - s->y++; - if (s->y == s->height) { - for(;;) { - if (s->pass == NB_PASSES - 1) { - s->state |= PNG_ALLIMAGE; - goto the_end; - } else { - s->pass++; - s->y = 0; - s->pass_row_size = png_pass_row_size(s->pass, - s->bits_per_pixel, - s->width); - s->crow_size = s->pass_row_size + 1; - if (s->pass_row_size != 0) - break; - /* skip pass if empty row */ - } - } - } - } - the_end: ; - } -} - -static int png_decode_idat(PNGContext *s, int length) -{ - int ret; - s->zstream.avail_in = length; - s->zstream.next_in = s->bytestream; - s->bytestream += length; - - if(s->bytestream > s->bytestream_end) - return -1; - - /* decode one line if possible */ - while (s->zstream.avail_in > 0) { - ret = inflate(&s->zstream, Z_PARTIAL_FLUSH); - if (ret != Z_OK && ret != Z_STREAM_END) { - return -1; - } - if (s->zstream.avail_out == 0) { - if (!(s->state & PNG_ALLIMAGE)) { - png_handle_row(s); - } - s->zstream.avail_out = s->crow_size; - s->zstream.next_out = s->crow_buf; - } - } - return 0; -} - -static int decode_frame(AVCodecContext *avctx, - void *data, int *data_size, - uint8_t *buf, int buf_size) -{ - PNGContext * const s = avctx->priv_data; - AVFrame *picture = data; - AVFrame * const p= (AVFrame*)&s->picture; - uint32_t tag, length; - int ret, crc; - - s->bytestream_start= - s->bytestream= buf; - s->bytestream_end= buf + buf_size; - - /* check signature */ - if (memcmp(s->bytestream, pngsig, 8) != 0) - return -1; - s->bytestream+= 8; - s->y= - s->state=0; -// memset(s, 0, sizeof(PNGContext)); - /* init the zlib */ - s->zstream.zalloc = png_zalloc; - s->zstream.zfree = png_zfree; - s->zstream.opaque = NULL; - ret = inflateInit(&s->zstream); - if (ret != Z_OK) - return -1; - for(;;) { - int tag32; - if (s->bytestream >= s->bytestream_end) - goto fail; - length = bytestream_get_be32(&s->bytestream); - if (length > 0x7fffffff) - goto fail; - tag32 = bytestream_get_be32(&s->bytestream); - tag = bswap_32(tag32); -#ifdef DEBUG - av_log(avctx, AV_LOG_DEBUG, "png: tag=%c%c%c%c length=%u\n", - (tag & 0xff), - ((tag >> 8) & 0xff), - ((tag >> 16) & 0xff), - ((tag >> 24) & 0xff), length); -#endif - switch(tag) { - case MKTAG('I', 'H', 'D', 'R'): - if (length != 13) - goto fail; - s->width = bytestream_get_be32(&s->bytestream); - s->height = bytestream_get_be32(&s->bytestream); - if(avcodec_check_dimensions(avctx, s->width, s->height)){ - s->width= s->height= 0; - goto fail; - } - s->bit_depth = *s->bytestream++; - s->color_type = *s->bytestream++; - s->compression_type = *s->bytestream++; - s->filter_type = *s->bytestream++; - s->interlace_type = *s->bytestream++; - crc = bytestream_get_be32(&s->bytestream); - s->state |= PNG_IHDR; -#ifdef DEBUG - av_log(avctx, AV_LOG_DEBUG, "width=%d height=%d depth=%d color_type=%d compression_type=%d filter_type=%d interlace_type=%d\n", - s->width, s->height, s->bit_depth, s->color_type, - s->compression_type, s->filter_type, s->interlace_type); -#endif - break; - case MKTAG('I', 'D', 'A', 'T'): - if (!(s->state & PNG_IHDR)) - goto fail; - if (!(s->state & PNG_IDAT)) { - /* init image info */ - avctx->width = s->width; - avctx->height = s->height; - - s->channels = png_get_nb_channels(s->color_type); - s->bits_per_pixel = s->bit_depth * s->channels; - s->bpp = (s->bits_per_pixel + 7) >> 3; - s->row_size = (avctx->width * s->bits_per_pixel + 7) >> 3; - - if (s->bit_depth == 8 && - s->color_type == PNG_COLOR_TYPE_RGB) { - avctx->pix_fmt = PIX_FMT_RGB24; - } else if (s->bit_depth == 8 && - s->color_type == PNG_COLOR_TYPE_RGB_ALPHA) { - avctx->pix_fmt = PIX_FMT_RGB32; - } else if (s->bit_depth == 8 && - s->color_type == PNG_COLOR_TYPE_GRAY) { - avctx->pix_fmt = PIX_FMT_GRAY8; - } else if (s->bit_depth == 16 && - s->color_type == PNG_COLOR_TYPE_GRAY) { - avctx->pix_fmt = PIX_FMT_GRAY16BE; - } else if (s->bit_depth == 1 && - s->color_type == PNG_COLOR_TYPE_GRAY) { - avctx->pix_fmt = PIX_FMT_MONOBLACK; - } else if (s->color_type == PNG_COLOR_TYPE_PALETTE) { - avctx->pix_fmt = PIX_FMT_PAL8; - } else { - goto fail; - } - if(p->data[0]) - avctx->release_buffer(avctx, p); - - p->reference= 0; - if(avctx->get_buffer(avctx, p) < 0){ - av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n"); - goto fail; - } - p->pict_type= FF_I_TYPE; - p->key_frame= 1; - p->interlaced_frame = !!s->interlace_type; - - /* compute the compressed row size */ - if (!s->interlace_type) { - s->crow_size = s->row_size + 1; - } else { - s->pass = 0; - s->pass_row_size = png_pass_row_size(s->pass, - s->bits_per_pixel, - s->width); - s->crow_size = s->pass_row_size + 1; - } -#ifdef DEBUG - av_log(avctx, AV_LOG_DEBUG, "row_size=%d crow_size =%d\n", - s->row_size, s->crow_size); -#endif - s->image_buf = p->data[0]; - s->image_linesize = p->linesize[0]; - /* copy the palette if needed */ - if (s->color_type == PNG_COLOR_TYPE_PALETTE) - memcpy(p->data[1], s->palette, 256 * sizeof(uint32_t)); - /* empty row is used if differencing to the first row */ - s->last_row = av_mallocz(s->row_size); - if (!s->last_row) - goto fail; - if (s->interlace_type || - s->color_type == PNG_COLOR_TYPE_RGB_ALPHA) { - s->tmp_row = av_malloc(s->row_size); - if (!s->tmp_row) - goto fail; - } - /* compressed row */ - s->crow_buf = av_malloc(s->row_size + 1); - if (!s->crow_buf) - goto fail; - s->zstream.avail_out = s->crow_size; - s->zstream.next_out = s->crow_buf; - } - s->state |= PNG_IDAT; - if (png_decode_idat(s, length) < 0) - goto fail; - /* skip crc */ - crc = bytestream_get_be32(&s->bytestream); - break; - case MKTAG('P', 'L', 'T', 'E'): - { - int n, i, r, g, b; - - if ((length % 3) != 0 || length > 256 * 3) - goto skip_tag; - /* read the palette */ - n = length / 3; - for(i=0;ibytestream++; - g = *s->bytestream++; - b = *s->bytestream++; - s->palette[i] = (0xff << 24) | (r << 16) | (g << 8) | b; - } - for(;i<256;i++) { - s->palette[i] = (0xff << 24); - } - s->state |= PNG_PLTE; - crc = bytestream_get_be32(&s->bytestream); - } - break; - case MKTAG('t', 'R', 'N', 'S'): - { - int v, i; - - /* read the transparency. XXX: Only palette mode supported */ - if (s->color_type != PNG_COLOR_TYPE_PALETTE || - length > 256 || - !(s->state & PNG_PLTE)) - goto skip_tag; - for(i=0;ibytestream++; - s->palette[i] = (s->palette[i] & 0x00ffffff) | (v << 24); - } - crc = bytestream_get_be32(&s->bytestream); - } - break; - case MKTAG('I', 'E', 'N', 'D'): - if (!(s->state & PNG_ALLIMAGE)) - goto fail; - crc = bytestream_get_be32(&s->bytestream); - goto exit_loop; - default: - /* skip tag */ - skip_tag: - s->bytestream += length + 4; - break; - } - } - exit_loop: - *picture= *(AVFrame*)&s->picture; - *data_size = sizeof(AVPicture); - - ret = s->bytestream - s->bytestream_start; - the_end: - inflateEnd(&s->zstream); - av_freep(&s->crow_buf); - av_freep(&s->last_row); - av_freep(&s->tmp_row); - return ret; - fail: - ret = -1; - goto the_end; -} -#endif - -#ifdef CONFIG_ENCODERS -static void png_write_chunk(uint8_t **f, uint32_t tag, - const uint8_t *buf, int length) -{ - uint32_t crc; - uint8_t tagbuf[4]; - - bytestream_put_be32(f, length); - crc = crc32(0, Z_NULL, 0); - AV_WL32(tagbuf, tag); - crc = crc32(crc, tagbuf, 4); - bytestream_put_be32(f, bswap_32(tag)); - if (length > 0) { - crc = crc32(crc, buf, length); - memcpy(*f, buf, length); - *f += length; - } - bytestream_put_be32(f, crc); -} - -/* XXX: do filtering */ -static int png_write_row(PNGContext *s, const uint8_t *data, int size) -{ - int ret; - - s->zstream.avail_in = size; - s->zstream.next_in = (uint8_t *)data; - while (s->zstream.avail_in > 0) { - ret = deflate(&s->zstream, Z_NO_FLUSH); - if (ret != Z_OK) - return -1; - if (s->zstream.avail_out == 0) { - if(s->bytestream_end - s->bytestream > IOBUF_SIZE + 100) - png_write_chunk(&s->bytestream, MKTAG('I', 'D', 'A', 'T'), s->buf, IOBUF_SIZE); - s->zstream.avail_out = IOBUF_SIZE; - s->zstream.next_out = s->buf; - } - } - return 0; -} -#endif /* CONFIG_ENCODERS */ - -static int common_init(AVCodecContext *avctx){ +int ff_png_common_init(AVCodecContext *avctx){ PNGContext *s = avctx->priv_data; avcodec_get_frame_defaults((AVFrame*)&s->picture); @@ -735,204 +90,3 @@ static int common_init(AVCodecContext *avctx){ return 0; } - -#ifdef CONFIG_ENCODERS -static int encode_frame(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data){ - PNGContext *s = avctx->priv_data; - AVFrame *pict = data; - AVFrame * const p= (AVFrame*)&s->picture; - int bit_depth, color_type, y, len, row_size, ret, is_progressive; - int bits_per_pixel, pass_row_size; - uint8_t *ptr; - uint8_t *crow_buf = NULL; - uint8_t *tmp_buf = NULL; - - *p = *pict; - p->pict_type= FF_I_TYPE; - p->key_frame= 1; - - s->bytestream_start= - s->bytestream= buf; - s->bytestream_end= buf+buf_size; - - is_progressive = !!(avctx->flags & CODEC_FLAG_INTERLACED_DCT); - switch(avctx->pix_fmt) { - case PIX_FMT_RGB32: - bit_depth = 8; - color_type = PNG_COLOR_TYPE_RGB_ALPHA; - break; - case PIX_FMT_RGB24: - bit_depth = 8; - color_type = PNG_COLOR_TYPE_RGB; - break; - case PIX_FMT_GRAY8: - bit_depth = 8; - color_type = PNG_COLOR_TYPE_GRAY; - break; - case PIX_FMT_MONOBLACK: - bit_depth = 1; - color_type = PNG_COLOR_TYPE_GRAY; - break; - case PIX_FMT_PAL8: - bit_depth = 8; - color_type = PNG_COLOR_TYPE_PALETTE; - break; - default: - return -1; - } - bits_per_pixel = png_get_nb_channels(color_type) * bit_depth; - row_size = (avctx->width * bits_per_pixel + 7) >> 3; - - s->zstream.zalloc = png_zalloc; - s->zstream.zfree = png_zfree; - s->zstream.opaque = NULL; - ret = deflateInit2(&s->zstream, Z_DEFAULT_COMPRESSION, - Z_DEFLATED, 15, 8, Z_DEFAULT_STRATEGY); - if (ret != Z_OK) - return -1; - crow_buf = av_malloc(row_size + 1); - if (!crow_buf) - goto fail; - if (is_progressive) { - tmp_buf = av_malloc(row_size + 1); - if (!tmp_buf) - goto fail; - } - - /* write png header */ - memcpy(s->bytestream, pngsig, 8); - s->bytestream += 8; - - AV_WB32(s->buf, avctx->width); - AV_WB32(s->buf + 4, avctx->height); - s->buf[8] = bit_depth; - s->buf[9] = color_type; - s->buf[10] = 0; /* compression type */ - s->buf[11] = 0; /* filter type */ - s->buf[12] = is_progressive; /* interlace type */ - - png_write_chunk(&s->bytestream, MKTAG('I', 'H', 'D', 'R'), s->buf, 13); - - /* put the palette if needed */ - if (color_type == PNG_COLOR_TYPE_PALETTE) { - int has_alpha, alpha, i; - unsigned int v; - uint32_t *palette; - uint8_t *alpha_ptr; - - palette = (uint32_t *)p->data[1]; - ptr = s->buf; - alpha_ptr = s->buf + 256 * 3; - has_alpha = 0; - for(i = 0; i < 256; i++) { - v = palette[i]; - alpha = v >> 24; - if (alpha && alpha != 0xff) - has_alpha = 1; - *alpha_ptr++ = alpha; - bytestream_put_be24(&ptr, v); - } - png_write_chunk(&s->bytestream, MKTAG('P', 'L', 'T', 'E'), s->buf, 256 * 3); - if (has_alpha) { - png_write_chunk(&s->bytestream, MKTAG('t', 'R', 'N', 'S'), s->buf + 256 * 3, 256); - } - } - - /* now put each row */ - s->zstream.avail_out = IOBUF_SIZE; - s->zstream.next_out = s->buf; - if (is_progressive) { - uint8_t *ptr1; - int pass; - - for(pass = 0; pass < NB_PASSES; pass++) { - /* NOTE: a pass is completely omited if no pixels would be - output */ - pass_row_size = png_pass_row_size(pass, bits_per_pixel, avctx->width); - if (pass_row_size > 0) { - for(y = 0; y < avctx->height; y++) { - if ((png_pass_ymask[pass] << (y & 7)) & 0x80) { - ptr = p->data[0] + y * p->linesize[0]; - if (color_type == PNG_COLOR_TYPE_RGB_ALPHA) { - convert_from_rgb32(tmp_buf, ptr, avctx->width); - ptr1 = tmp_buf; - } else { - ptr1 = ptr; - } - png_get_interlaced_row(crow_buf + 1, pass_row_size, - bits_per_pixel, pass, - ptr1, avctx->width); - crow_buf[0] = PNG_FILTER_VALUE_NONE; - png_write_row(s, crow_buf, pass_row_size + 1); - } - } - } - } - } else { - for(y = 0; y < avctx->height; y++) { - ptr = p->data[0] + y * p->linesize[0]; - if (color_type == PNG_COLOR_TYPE_RGB_ALPHA) - convert_from_rgb32(crow_buf + 1, ptr, avctx->width); - else - memcpy(crow_buf + 1, ptr, row_size); - crow_buf[0] = PNG_FILTER_VALUE_NONE; - png_write_row(s, crow_buf, row_size + 1); - } - } - /* compress last bytes */ - for(;;) { - ret = deflate(&s->zstream, Z_FINISH); - if (ret == Z_OK || ret == Z_STREAM_END) { - len = IOBUF_SIZE - s->zstream.avail_out; - if (len > 0 && s->bytestream_end - s->bytestream > len + 100) { - png_write_chunk(&s->bytestream, MKTAG('I', 'D', 'A', 'T'), s->buf, len); - } - s->zstream.avail_out = IOBUF_SIZE; - s->zstream.next_out = s->buf; - if (ret == Z_STREAM_END) - break; - } else { - goto fail; - } - } - png_write_chunk(&s->bytestream, MKTAG('I', 'E', 'N', 'D'), NULL, 0); - - ret = s->bytestream - s->bytestream_start; - the_end: - av_free(crow_buf); - av_free(tmp_buf); - deflateEnd(&s->zstream); - return ret; - fail: - ret = -1; - goto the_end; -} -#endif - -#ifdef CONFIG_PNG_DECODER -AVCodec png_decoder = { - "png", - CODEC_TYPE_VIDEO, - CODEC_ID_PNG, - sizeof(PNGContext), - common_init, - NULL, - NULL, //decode_end, - decode_frame, - 0 /*CODEC_CAP_DR1*/ /*| CODEC_CAP_DRAW_HORIZ_BAND*/, - NULL -}; -#endif - -#ifdef CONFIG_PNG_ENCODER -AVCodec png_encoder = { - "png", - CODEC_TYPE_VIDEO, - CODEC_ID_PNG, - sizeof(PNGContext), - common_init, - encode_frame, - NULL, //encode_end, - .pix_fmts= (enum PixelFormat[]){PIX_FMT_RGB24, PIX_FMT_RGB32, PIX_FMT_PAL8, PIX_FMT_GRAY8, PIX_FMT_MONOBLACK, -1}, -}; -#endif // CONFIG_PNG_ENCODER -- cgit v1.2.3