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exr: track channels properties 

Needed for proper decoding of channels with subsampling
and also for remaining compression methods.

Signed-off-by: Paul B Mahol <onemda@gmail.com>
This commit is contained in:
Paul B Mahol 2013-02-28 16:50:33 +00:00
parent d9fad53f4b
commit a71926a548
1 changed files with 25 additions and 0 deletions
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25
libavcodec/exr.c
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@ -48,6 +48,17 @@ enum ExrCompr {
EXR_B44A = 7,
};
enum ExrPixelType {
EXR_UINT,
EXR_HALF,
EXR_FLOAT
};
typedef struct EXRChannel {
int xsub, ysub;
enum ExrPixelType pixel_type;
} EXRChannel;
typedef struct EXRThreadData {
uint8_t *uncompressed_data;
int uncompressed_size;
@ -73,6 +84,9 @@ typedef struct EXRContext {
const uint8_t *buf, *table;
int buf_size;
EXRChannel *channels;
int nb_channels;
EXRThreadData *thread_data;
int thread_data_size;
} EXRContext;
@ -405,6 +419,7 @@ static int decode_frame(AVCodecContext *avctx,
s->channel_offsets[2] = -1;
s->channel_offsets[3] = -1;
s->bits_per_color_id = -1;
s->nb_channels = 0;
s->compr = -1;
s->buf = buf;
s->buf_size = buf_size;
@ -443,6 +458,7 @@ static int decode_frame(AVCodecContext *avctx,
channel_list_end = buf + variable_buffer_data_size;
while (channel_list_end - buf >= 19) {
EXRChannel *channel;
int current_bits_per_color_id = -1;
int channel_index = -1;
int xsub, ysub;
@ -489,6 +505,14 @@ static int decode_frame(AVCodecContext *avctx,
s->channel_offsets[channel_index] = current_channel_offset;
}
s->channels = av_realloc_f(s->channels, ++s->nb_channels, sizeof(EXRChannel));
if (!s->channels)
return AVERROR(ENOMEM);
channel = &s->channels[s->nb_channels - 1];
channel->pixel_type = current_bits_per_color_id;
channel->xsub = xsub;
channel->ysub = ysub;
current_channel_offset += 1 << current_bits_per_color_id;
}
@ -725,6 +749,7 @@ static av_cold int decode_end(AVCodecContext *avctx)
av_freep(&s->thread_data);
s->thread_data_size = 0;
av_freep(&s->channels);
return 0;
}