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add a 'format' field to WebPBitstreamFeatures

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Change-Id: I79a688e4c34fb77527127bbdf4bc844efa6aa9a4
This commit is contained in:
Pascal Massimino
2013-08-21 21:56:35 +00:00
committed by James Zern
parent dde91fde96
commit 86c0031eb2
3 changed files with 26 additions and 11 deletions
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17
src/dec/webp.c
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@ -285,6 +285,7 @@ static VP8StatusCode ParseHeadersInternal(const uint8_t* data,
int* const height,
int* const has_alpha,
int* const has_animation,
int* const format,
WebPHeaderStructure* const headers) {
int canvas_width = 0;
int canvas_height = 0;
@ -292,6 +293,9 @@ static VP8StatusCode ParseHeadersInternal(const uint8_t* data,
int image_height = 0;
int found_riff = 0;
int found_vp8x = 0;
int animation_present = 0;
int fragments_present = 0;
VP8StatusCode status;
WebPHeaderStructure hdrs;
@ -312,8 +316,6 @@ static VP8StatusCode ParseHeadersInternal(const uint8_t* data,
// Skip over VP8X.
{
uint32_t flags = 0;
int animation_present;
int fragments_present;
status = ParseVP8X(&data, &data_size, &found_vp8x,
&canvas_width, &canvas_height, &flags);
if (status != VP8_STATUS_OK) {
@ -328,6 +330,7 @@ static VP8StatusCode ParseHeadersInternal(const uint8_t* data,
}
if (has_alpha != NULL) *has_alpha = !!(flags & ALPHA_FLAG);
if (has_animation != NULL) *has_animation = animation_present;
if (format != NULL) *format = 0; // default = undefined
if (found_vp8x && (animation_present || fragments_present) &&
headers == NULL) {
@ -359,6 +362,10 @@ static VP8StatusCode ParseHeadersInternal(const uint8_t* data,
return VP8_STATUS_BITSTREAM_ERROR;
}
if (format != NULL && !(animation_present || fragments_present)) {
*format = hdrs.is_lossless ? 2 : 1;
}
if (!hdrs.is_lossless) {
if (data_size < VP8_FRAME_HEADER_SIZE) {
return VP8_STATUS_NOT_ENOUGH_DATA;
@ -405,7 +412,8 @@ VP8StatusCode WebPParseHeaders(WebPHeaderStructure* const headers) {
assert(headers != NULL);
// fill out headers, ignore width/height/has_alpha.
status = ParseHeadersInternal(headers->data, headers->data_size,
NULL, NULL, NULL, &has_animation, headers);
NULL, NULL, NULL, &has_animation,
NULL, headers);
if (status == VP8_STATUS_OK || status == VP8_STATUS_NOT_ENOUGH_DATA) {
// TODO(jzern): full support of animation frames will require API additions.
if (has_animation) {
@ -652,7 +660,6 @@ uint8_t* WebPDecodeYUV(const uint8_t* data, size_t data_size,
static void DefaultFeatures(WebPBitstreamFeatures* const features) {
assert(features != NULL);
memset(features, 0, sizeof(*features));
features->bitstream_version = 0;
}
static VP8StatusCode GetFeatures(const uint8_t* const data, size_t data_size,
@ -666,7 +673,7 @@ static VP8StatusCode GetFeatures(const uint8_t* const data, size_t data_size,
return ParseHeadersInternal(data, data_size,
&features->width, &features->height,
&features->has_alpha, &features->has_animation,
NULL);
&features->format, NULL);
}
//------------------------------------------------------------------------------

4
src/webp/decode.h
View File

@ -20,7 +20,7 @@
extern "C" {
#endif
#define WEBP_DECODER_ABI_VERSION 0x0201 // MAJOR(8b) + MINOR(8b)
#define WEBP_DECODER_ABI_VERSION 0x0202 // MAJOR(8b) + MINOR(8b)
// Note: forward declaring enumerations is not allowed in (strict) C and C++,
// the types are left here for reference.
@ -404,9 +404,9 @@ struct WebPBitstreamFeatures {
int height; // Height in pixels, as read from the bitstream.
int has_alpha; // True if the bitstream contains an alpha channel.
int has_animation; // True if the bitstream is an animation.
int format; // 0 = undefined (/mixed), 1 = lossy, 2 = lossless
// Unused for now:
int bitstream_version; // should be 0 for now. TODO(later)
int no_incremental_decoding; // if true, using incremental decoding is not
// recommended.
int rotate; // TODO(later)