*
* AAC LATM decoder
* Copyright (c) 2008-2010 Paul Kendall <paul@kcbbs.gen.nz>
- * Copyright (c) 2010 Janne Grunau <janne-ffmpeg@jannau.net>
+ * Copyright (c) 2010 Janne Grunau <janne-libav@jannau.net>
*
* This file is part of Libav.
*
static const char overread_err[] = "Input buffer exhausted before END element found\n";
-static ChannelElement *get_che(AACContext *ac, int type, int elem_id)
-{
- // For PCE based channel configurations map the channels solely based on tags.
- if (!ac->m4ac.chan_config) {
- return ac->tag_che_map[type][elem_id];
- }
- // For indexed channel configurations map the channels solely based on position.
- 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[1] LFE[0]. If we seem to have
- encountered such a stream, transfer the LFE[0] element to the SCE[1]'s mapping */
- 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;
- }
-}
-
static int count_channels(uint8_t (*layout)[3], int tags)
{
int i, sum = 0;
break;
if (layout_map[i][0] == TYPE_CPE) {
if (sce_parity) {
- if (pos == AAC_CHANNEL_FRONT || !first_cpe) {
+ if (pos == AAC_CHANNEL_FRONT && !first_cpe) {
sce_parity = 0;
} else {
return -1;
static uint64_t sniff_channel_order(uint8_t (*layout_map)[3], int tags)
{
int i, n, total_non_cc_elements;
- struct elem_to_channel e2c_vec[MAX_ELEM_ID] = {{ 0 }};
+ struct elem_to_channel e2c_vec[4*MAX_ELEM_ID] = {{ 0 }};
int num_front_channels, num_side_channels, num_back_channels;
uint64_t layout;
+ if (FF_ARRAY_ELEMS(e2c_vec) < tags)
+ return 0;
+
i = 0;
num_front_channels =
count_paired_channels(layout_map, tags, AAC_CHANNEL_FRONT, &i);
/**
* Configure output channel order based on the current program configuration element.
*
- * @param che_pos current channel position configuration
- *
* @return Returns error status. 0 - OK, !0 - error
*/
static av_cold int output_configure(AACContext *ac,
return 0;
}
+/**
+ * Set up channel positions based on a default channel configuration
+ * as specified in table 1.17.
+ *
+ * @return Returns error status. 0 - OK, !0 - error
+ */
+static av_cold int set_default_channel_config(AVCodecContext *avctx,
+ uint8_t (*layout_map)[3],
+ int *tags,
+ int channel_config)
+{
+ if (channel_config < 1 || channel_config > 7) {
+ av_log(avctx, AV_LOG_ERROR, "invalid default channel configuration (%d)\n",
+ channel_config);
+ return -1;
+ }
+ *tags = tags_per_config[channel_config];
+ memcpy(layout_map, aac_channel_layout_map[channel_config-1], *tags * sizeof(*layout_map));
+ return 0;
+}
+
+static ChannelElement *get_che(AACContext *ac, int type, int elem_id)
+{
+ // For PCE based channel configurations map the channels solely based on tags.
+ if (!ac->m4ac.chan_config) {
+ return ac->tag_che_map[type][elem_id];
+ }
+ // Allow single CPE stereo files to be signalled with mono configuration.
+ if (!ac->tags_mapped && type == TYPE_CPE && ac->m4ac.chan_config == 1) {
+ uint8_t layout_map[MAX_ELEM_ID*4][3];
+ int layout_map_tags;
+
+ if (set_default_channel_config(ac->avctx, layout_map, &layout_map_tags,
+ 2) < 0)
+ return NULL;
+ if (output_configure(ac, layout_map, layout_map_tags,
+ 2, OC_TRIAL_FRAME) < 0)
+ return NULL;
+
+ ac->m4ac.chan_config = 2;
+ }
+ // For indexed channel configurations map the channels solely based on position.
+ 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[1] LFE[0]. If we seem to have
+ encountered such a stream, transfer the LFE[0] element to the SCE[1]'s mapping */
+ 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;
+ }
+}
+
/**
* Decode an array of 4 bit element IDs, optionally interleaved with a stereo/mono switching bit.
*
- * @param cpe_map Stereo (Channel Pair Element) map, NULL if stereo bit is not present.
- * @param sce_map mono (Single Channel Element) map
* @param type speaker type/position for these channels
*/
static void decode_channel_map(uint8_t layout_map[][3],
return tags;
}
-/**
- * Set up channel positions based on a default channel configuration
- * as specified in table 1.17.
- *
- * @return Returns error status. 0 - OK, !0 - error
- */
-static av_cold int set_default_channel_config(AVCodecContext *avctx,
- uint8_t (*layout_map)[3],
- int *tags,
- int channel_config)
-{
- if (channel_config < 1 || channel_config > 7) {
- av_log(avctx, AV_LOG_ERROR, "invalid default channel configuration (%d)\n",
- channel_config);
- return -1;
- }
- *tags = tags_per_config[channel_config];
- memcpy(layout_map, aac_channel_layout_map[channel_config-1], *tags * sizeof(*layout_map));
- return 0;
-}
-
/**
* Decode GA "General Audio" specific configuration; reference: table 4.1.
*
av_log(ac->avctx, AV_LOG_ERROR, "invalid band type\n");
return -1;
}
- while ((sect_len_incr = get_bits(gb, bits)) == (1 << bits) - 1)
+ do {
+ sect_len_incr = get_bits(gb, bits);
sect_end += sect_len_incr;
- sect_end += sect_len_incr;
- if (get_bits_left(gb) < 0) {
- av_log(ac->avctx, AV_LOG_ERROR, overread_err);
- return -1;
- }
- if (sect_end > ics->max_sfb) {
- av_log(ac->avctx, AV_LOG_ERROR,
- "Number of bands (%d) exceeds limit (%d).\n",
- sect_end, ics->max_sfb);
- return -1;
- }
+ if (get_bits_left(gb) < 0) {
+ av_log(ac->avctx, AV_LOG_ERROR, overread_err);
+ return -1;
+ }
+ if (sect_end > ics->max_sfb) {
+ av_log(ac->avctx, AV_LOG_ERROR,
+ "Number of bands (%d) exceeds limit (%d).\n",
+ sect_end, ics->max_sfb);
+ return -1;
+ }
+ } while (sect_len_incr == (1 << bits) - 1);
for (; k < sect_end; k++) {
band_type [idx] = sect_band_type;
band_type_run_end[idx++] = sect_end;
int offset[3] = { global_gain, global_gain - 90, 0 };
int clipped_offset;
int noise_flag = 1;
- static const char *sf_str[3] = { "Global gain", "Noise gain", "Intensity stereo position" };
for (g = 0; g < ics->num_window_groups; g++) {
for (i = 0; i < ics->max_sfb;) {
int run_end = band_type_run_end[idx];
offset[0] += get_vlc2(gb, vlc_scalefactors.table, 7, 3) - 60;
if (offset[0] > 255U) {
av_log(ac->avctx, AV_LOG_ERROR,
- "%s (%d) out of range.\n", sf_str[0], offset[0]);
+ "Scalefactor (%d) out of range.\n", offset[0]);
return -1;
}
sf[idx] = -ff_aac_pow2sf_tab[offset[0] - 100 + POW_SF2_ZERO];
projects / ffmpeg / blobdiff