[FFmpeg-cvslog] r17856 - in trunk/libavcodec: aac.c aac.h
alexc
subversion
Fri Mar 6 20:47:01 CET 2009
Author: alexc
Date: Fri Mar 6 20:47:01 2009
New Revision: 17856
Log:
Fix the channel allocation bug/assumption (issue 800).
Approved by Rob on IRC.
Modified:
trunk/libavcodec/aac.c
trunk/libavcodec/aac.h
Modified: trunk/libavcodec/aac.c
==============================================================================
--- trunk/libavcodec/aac.c Fri Mar 6 11:18:39 2009 (r17855)
+++ trunk/libavcodec/aac.c Fri Mar 6 20:47:01 2009 (r17856)
@@ -97,6 +97,56 @@ static VLC vlc_scalefactors;
static VLC vlc_spectral[11];
+static ChannelElement* get_che(AACContext *ac, int type, int elem_id) {
+ static const int8_t tags_per_config[16] = { 0, 1, 1, 2, 3, 3, 4, 5, 0, 0, 0, 0, 0, 0, 0, 0 };
+ if (ac->tag_che_map[type][elem_id]) {
+ return ac->tag_che_map[type][elem_id];
+ }
+ if (ac->tags_mapped >= tags_per_config[ac->m4ac.chan_config]) {
+ return NULL;
+ }
+ switch (ac->m4ac.chan_config) {
+ case 7:
+ if (ac->tags_mapped == 3 && type == TYPE_CPE) {
+ ac->tags_mapped++;
+ return ac->tag_che_map[TYPE_CPE][elem_id] = ac->che[TYPE_CPE][2];
+ }
+ case 6:
+ /* Some streams incorrectly code 5.1 audio as SCE[0] CPE[0] CPE[1] SCE[1]
+ instead of SCE[0] CPE[0] CPE[0] LFE[0]. If we seem to have
+ encountered such a stream, transfer the LFE[0] element to SCE[1] */
+ if (ac->tags_mapped == tags_per_config[ac->m4ac.chan_config] - 1 && (type == TYPE_LFE || type == TYPE_SCE)) {
+ ac->tags_mapped++;
+ return ac->tag_che_map[type][elem_id] = ac->che[TYPE_LFE][0];
+ }
+ case 5:
+ if (ac->tags_mapped == 2 && type == TYPE_CPE) {
+ ac->tags_mapped++;
+ return ac->tag_che_map[TYPE_CPE][elem_id] = ac->che[TYPE_CPE][1];
+ }
+ case 4:
+ if (ac->tags_mapped == 2 && ac->m4ac.chan_config == 4 && type == TYPE_SCE) {
+ ac->tags_mapped++;
+ return ac->tag_che_map[TYPE_SCE][elem_id] = ac->che[TYPE_SCE][1];
+ }
+ case 3:
+ case 2:
+ if (ac->tags_mapped == (ac->m4ac.chan_config != 2) && type == TYPE_CPE) {
+ ac->tags_mapped++;
+ return ac->tag_che_map[TYPE_CPE][elem_id] = ac->che[TYPE_CPE][0];
+ } else if (ac->m4ac.chan_config == 2) {
+ return NULL;
+ }
+ case 1:
+ if (!ac->tags_mapped && type == TYPE_SCE) {
+ ac->tags_mapped++;
+ return ac->tag_che_map[TYPE_SCE][elem_id] = ac->che[TYPE_SCE][0];
+ }
+ default:
+ return NULL;
+ }
+}
+
/**
* Configure output channel order based on the current program configuration element.
*
@@ -106,7 +156,7 @@ static VLC vlc_spectral[11];
* @return Returns error status. 0 - OK, !0 - error
*/
static int output_configure(AACContext *ac, enum ChannelPosition che_pos[4][MAX_ELEM_ID],
- enum ChannelPosition new_che_pos[4][MAX_ELEM_ID]) {
+ enum ChannelPosition new_che_pos[4][MAX_ELEM_ID], int channel_config) {
AVCodecContext *avctx = ac->avccontext;
int i, type, channels = 0;
@@ -140,7 +190,16 @@ static int output_configure(AACContext *
}
}
+ if (channel_config) {
+ memset(ac->tag_che_map, 0, 4 * MAX_ELEM_ID * sizeof(ac->che[0][0]));
+ ac->tags_mapped = 0;
+ } else {
+ memcpy(ac->tag_che_map, ac->che, 4 * MAX_ELEM_ID * sizeof(ac->che[0][0]));
+ ac->tags_mapped = 4*MAX_ELEM_ID;
+ }
+
avctx->channels = channels;
+
return 0;
}
@@ -286,7 +345,7 @@ static int decode_ga_specific_config(AAC
if((ret = set_default_channel_config(ac, new_che_pos, channel_config)))
return ret;
}
- if((ret = output_configure(ac, ac->che_pos, new_che_pos)))
+ if((ret = output_configure(ac, ac->che_pos, new_che_pos, channel_config)))
return ret;
if (extension_flag) {
@@ -394,7 +453,7 @@ static av_cold int aac_decode_init(AVCod
memset(new_che_pos, 0, 4 * MAX_ELEM_ID * sizeof(new_che_pos[0][0]));
if(set_default_channel_config(ac, new_che_pos, avccontext->channels - (avccontext->channels == 8)))
return -1;
- if(output_configure(ac, ac->che_pos, new_che_pos))
+ if(output_configure(ac, ac->che_pos, new_che_pos, 1))
return -1;
ac->m4ac.sample_rate = avccontext->sample_rate;
} else {
@@ -1552,6 +1611,7 @@ static int parse_adts_frame_header(AACCo
static int aac_decode_frame(AVCodecContext * avccontext, void * data, int * data_size, const uint8_t * buf, int buf_size) {
AACContext * ac = avccontext->priv_data;
+ ChannelElement * che = NULL;
GetBitContext gb;
enum RawDataBlockType elem_type;
int err, elem_id, data_size_tmp;
@@ -1574,15 +1634,7 @@ static int aac_decode_frame(AVCodecConte
elem_id = get_bits(&gb, 4);
err = -1;
- if(elem_type == TYPE_SCE && elem_id == 1 &&
- !ac->che[TYPE_SCE][elem_id] && ac->che[TYPE_LFE][0]) {
- /* Some streams incorrectly code 5.1 audio as SCE[0] CPE[0] CPE[1] SCE[1]
- instead of SCE[0] CPE[0] CPE[0] LFE[0]. If we seem to have
- encountered such a stream, transfer the LFE[0] element to SCE[1] */
- ac->che[TYPE_SCE][elem_id] = ac->che[TYPE_LFE][0];
- ac->che[TYPE_LFE][0] = NULL;
- }
- if(elem_type < TYPE_DSE && !ac->che[elem_type][elem_id]) {
+ if(elem_type < TYPE_DSE && !(che=get_che(ac, elem_type, elem_id))) {
av_log(ac->avccontext, AV_LOG_ERROR, "channel element %d.%d is not allocated\n", elem_type, elem_id);
return -1;
}
@@ -1590,19 +1642,19 @@ static int aac_decode_frame(AVCodecConte
switch (elem_type) {
case TYPE_SCE:
- err = decode_ics(ac, &ac->che[TYPE_SCE][elem_id]->ch[0], &gb, 0, 0);
+ err = decode_ics(ac, &che->ch[0], &gb, 0, 0);
break;
case TYPE_CPE:
- err = decode_cpe(ac, &gb, ac->che[TYPE_CPE][elem_id]);
+ err = decode_cpe(ac, &gb, che);
break;
case TYPE_CCE:
- err = decode_cce(ac, &gb, ac->che[TYPE_CCE][elem_id]);
+ err = decode_cce(ac, &gb, che);
break;
case TYPE_LFE:
- err = decode_ics(ac, &ac->che[TYPE_LFE][elem_id]->ch[0], &gb, 0, 0);
+ err = decode_ics(ac, &che->ch[0], &gb, 0, 0);
break;
case TYPE_DSE:
@@ -1616,7 +1668,7 @@ static int aac_decode_frame(AVCodecConte
memset(new_che_pos, 0, 4 * MAX_ELEM_ID * sizeof(new_che_pos[0][0]));
if((err = decode_pce(ac, new_che_pos, &gb)))
break;
- err = output_configure(ac, ac->che_pos, new_che_pos);
+ err = output_configure(ac, ac->che_pos, new_che_pos, 0);
break;
}
Modified: trunk/libavcodec/aac.h
==============================================================================
--- trunk/libavcodec/aac.h Fri Mar 6 11:18:39 2009 (r17855)
+++ trunk/libavcodec/aac.h Fri Mar 6 20:47:01 2009 (r17856)
@@ -260,6 +260,8 @@ typedef struct {
* first index as the first 4 raw data block types
*/
ChannelElement * che[4][MAX_ELEM_ID];
+ ChannelElement * tag_che_map[4][MAX_ELEM_ID];
+ int tags_mapped;
/** @} */
/**
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