[FFmpeg-devel] [PATCH 02/10] lavfi: support unknown channel layouts.
Nicolas George
nicolas.george at normalesup.org
Wed Jan 16 17:50:16 CET 2013
Signed-off-by: Nicolas George <nicolas.george at normalesup.org>
---
libavfilter/audio.c | 2 +-
libavfilter/avcodec.c | 3 --
libavfilter/avfiltergraph.c | 85 ++++++++++++++++++++++++++++++++++++++++---
libavfilter/formats.c | 82 ++++++++++++++++++++++++++++++++++++-----
libavfilter/formats.h | 31 ++++++++++++++++
5 files changed, 184 insertions(+), 19 deletions(-)
Updated the comment about the score.
diff --git a/libavfilter/audio.c b/libavfilter/audio.c
index 72dcd14..c72979d 100644
--- a/libavfilter/audio.c
+++ b/libavfilter/audio.c
@@ -44,7 +44,7 @@ AVFilterBufferRef *ff_default_get_audio_buffer(AVFilterLink *link, int perms,
AVFilterBufferRef *samplesref = NULL;
uint8_t **data;
int planar = av_sample_fmt_is_planar(link->format);
- int nb_channels = av_get_channel_layout_nb_channels(link->channel_layout);
+ int nb_channels = link->channels;
int planes = planar ? nb_channels : 1;
int linesize;
int full_perms = AV_PERM_READ | AV_PERM_WRITE | AV_PERM_PRESERVE |
diff --git a/libavfilter/avcodec.c b/libavfilter/avcodec.c
index 0c1f02a..2343d19 100644
--- a/libavfilter/avcodec.c
+++ b/libavfilter/avcodec.c
@@ -96,9 +96,6 @@ AVFilterBufferRef *avfilter_get_audio_buffer_ref_from_frame(const AVFrame *frame
int channels = av_frame_get_channels(frame);
int64_t layout = av_frame_get_channel_layout(frame);
- if(av_frame_get_channels(frame) > 8) // libavfilter does not suport more than 8 channels FIXME, remove once libavfilter is fixed
- return NULL;
-
if (layout && av_get_channel_layout_nb_channels(layout) != av_frame_get_channels(frame)) {
av_log(0, AV_LOG_ERROR, "Layout indicates a different number of channels than actually present\n");
return NULL;
diff --git a/libavfilter/avfiltergraph.c b/libavfilter/avfiltergraph.c
index c05bbb7..4b7d194 100644
--- a/libavfilter/avfiltergraph.c
+++ b/libavfilter/avfiltergraph.c
@@ -185,9 +185,24 @@ AVFilterContext *avfilter_graph_get_filter(AVFilterGraph *graph, char *name)
return NULL;
}
+static void sanitize_channel_layouts(void *log, AVFilterChannelLayouts *l)
+{
+ if (!l)
+ return;
+ if (l->nb_channel_layouts) {
+ if (l->all_layouts || l->all_counts)
+ av_log(log, AV_LOG_WARNING, "All layouts set on non-empty list\n");
+ l->all_layouts = l->all_counts = 0;
+ } else {
+ if (l->all_counts && !l->all_layouts)
+ av_log(log, AV_LOG_WARNING, "All counts without all layouts\n");
+ l->all_layouts = 1;
+ }
+}
+
static int filter_query_formats(AVFilterContext *ctx)
{
- int ret;
+ int ret, i;
AVFilterFormats *formats;
AVFilterChannelLayouts *chlayouts;
AVFilterFormats *samplerates;
@@ -201,6 +216,11 @@ static int filter_query_formats(AVFilterContext *ctx)
return ret;
}
+ for (i = 0; i < ctx->nb_inputs; i++)
+ sanitize_channel_layouts(ctx, ctx->inputs[i]->out_channel_layouts);
+ for (i = 0; i < ctx->nb_outputs; i++)
+ sanitize_channel_layouts(ctx, ctx->outputs[i]->in_channel_layouts);
+
formats = ff_all_formats(type);
if (!formats)
return AVERROR(ENOMEM);
@@ -470,7 +490,7 @@ static int pick_format(AVFilterLink *link, AVFilterLink *ref)
link->in_samplerates->format_count = 1;
link->sample_rate = link->in_samplerates->formats[0];
- if (!link->in_channel_layouts->nb_channel_layouts) {
+ if (link->in_channel_layouts->all_layouts) {
av_log(link->src, AV_LOG_ERROR, "Cannot select channel layout for"
"the link between filters %s and %s.\n", link->src->name,
link->dst->name);
@@ -478,7 +498,10 @@ static int pick_format(AVFilterLink *link, AVFilterLink *ref)
}
link->in_channel_layouts->nb_channel_layouts = 1;
link->channel_layout = link->in_channel_layouts->channel_layouts[0];
- link->channels = av_get_channel_layout_nb_channels(link->channel_layout);
+ if ((link->channels = FF_LAYOUT2COUNT(link->channel_layout)))
+ link->channel_layout = 0;
+ else
+ link->channels = av_get_channel_layout_nb_channels(link->channel_layout);
}
ff_formats_unref(&link->in_formats);
@@ -534,8 +557,42 @@ static int reduce_formats_on_filter(AVFilterContext *filter)
format_count, ff_add_format);
REDUCE_FORMATS(int, AVFilterFormats, samplerates, formats,
format_count, ff_add_format);
- REDUCE_FORMATS(uint64_t, AVFilterChannelLayouts, channel_layouts,
- channel_layouts, nb_channel_layouts, ff_add_channel_layout);
+
+ /* reduce channel layouts */
+ for (i = 0; i < filter->nb_inputs; i++) {
+ AVFilterLink *inlink = filter->inputs[i];
+ uint64_t fmt;
+
+ if (!inlink->out_channel_layouts ||
+ inlink->out_channel_layouts->nb_channel_layouts != 1)
+ continue;
+ fmt = inlink->out_channel_layouts->channel_layouts[0];
+
+ for (j = 0; j < filter->nb_outputs; j++) {
+ AVFilterLink *outlink = filter->outputs[j];
+ AVFilterChannelLayouts *fmts;
+
+ fmts = outlink->in_channel_layouts;
+ if (inlink->type != outlink->type || fmts->nb_channel_layouts == 1)
+ continue;
+
+ if (fmts->all_layouts) {
+ /* Turn the infinite list into a singleton */
+ fmts->all_layouts = fmts->all_counts = 0;
+ ff_add_channel_layout(&outlink->in_channel_layouts, fmt);
+ break;
+ }
+
+ for (k = 0; k < outlink->in_channel_layouts->nb_channel_layouts; k++) {
+ if (fmts->channel_layouts[k] == fmt) {
+ fmts->channel_layouts[0] = fmt;
+ fmts->nb_channel_layouts = 1;
+ ret = 1;
+ break;
+ }
+ }
+ }
+ }
return ret;
}
@@ -663,7 +720,23 @@ static void swap_channel_layouts_on_filter(AVFilterContext *filter)
int out_channels = av_get_channel_layout_nb_channels(out_chlayout);
int count_diff = out_channels - in_channels;
int matched_channels, extra_channels;
- int score = 0;
+ int score = 100000;
+
+ if (FF_LAYOUT2COUNT(in_chlayout) || FF_LAYOUT2COUNT(out_chlayout)) {
+ /* Compute score in case the input or output layout encodes
+ a channel count; in this case the score is not altered by
+ the computation afterwards, as in_chlayout and
+ out_chlayout have both been set to 0 */
+ if (FF_LAYOUT2COUNT(in_chlayout))
+ in_channels = FF_LAYOUT2COUNT(in_chlayout);
+ if (FF_LAYOUT2COUNT(out_chlayout))
+ out_channels = FF_LAYOUT2COUNT(out_chlayout);
+ score -= 10000 + FFABS(out_channels - in_channels) +
+ (in_channels > out_channels ? 10000 : 0);
+ in_chlayout = out_chlayout = 0;
+ /* Let the remaining computation run, even if the score
+ value is not altered */
+ }
/* channel substitution */
for (k = 0; k < FF_ARRAY_ELEMS(ch_subst); k++) {
diff --git a/libavfilter/formats.c b/libavfilter/formats.c
index ea9a184..296e4f4 100644
--- a/libavfilter/formats.c
+++ b/libavfilter/formats.c
@@ -19,6 +19,7 @@
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
+#include "libavutil/avassert.h"
#include "libavutil/channel_layout.h"
#include "libavutil/common.h"
#include "libavutil/eval.h"
@@ -28,6 +29,8 @@
#include "internal.h"
#include "formats.h"
+#define KNOWN(l) (!FF_LAYOUT2COUNT(l)) /* for readability */
+
/**
* Add all refs from a to ret and destroy a.
*/
@@ -136,21 +139,77 @@ AVFilterChannelLayouts *ff_merge_channel_layouts(AVFilterChannelLayouts *a,
AVFilterChannelLayouts *b)
{
AVFilterChannelLayouts *ret = NULL;
+ unsigned a_all = a->all_layouts + a->all_counts;
+ unsigned b_all = b->all_layouts + b->all_counts;
+ int ret_max, ret_nb = 0, i, j, round;
if (a == b) return a;
- if (a->nb_channel_layouts && b->nb_channel_layouts) {
- MERGE_FORMATS(ret, a, b, channel_layouts, nb_channel_layouts,
- AVFilterChannelLayouts, fail);
- } else if (a->nb_channel_layouts) {
- MERGE_REF(a, b, channel_layouts, AVFilterChannelLayouts, fail);
- ret = a;
- } else {
+ /* Put the most generic set in a, to avoid doing everything twice */
+ if (a_all < b_all) {
+ FFSWAP(AVFilterChannelLayouts *, a, b);
+ FFSWAP(unsigned, a_all, b_all);
+ }
+ if (a_all) {
+ if (a_all == 1 && !b_all) {
+ /* keep only known layouts in b; works also for b_all = 1 */
+ for (i = j = 0; i < b->nb_channel_layouts; i++)
+ if (KNOWN(b->channel_layouts[i]))
+ b->channel_layouts[j++] = b->channel_layouts[i];
+ b->nb_channel_layouts = j;
+ }
MERGE_REF(b, a, channel_layouts, AVFilterChannelLayouts, fail);
- ret = b;
+ return b;
}
+ ret_max = a->nb_channel_layouts + b->nb_channel_layouts;
+ if (!(ret = av_mallocz(sizeof(*ret))) ||
+ !(ret->channel_layouts = av_malloc(sizeof(*ret->channel_layouts) *
+ ret_max)))
+ goto fail;
+
+ /* a[known] intersect b[known] */
+ for (i = 0; i < a->nb_channel_layouts; i++) {
+ if (!KNOWN(a->channel_layouts[i]))
+ continue;
+ for (j = 0; j < b->nb_channel_layouts; j++) {
+ if (a->channel_layouts[i] == b->channel_layouts[j]) {
+ ret->channel_layouts[ret_nb++] = a->channel_layouts[i];
+ a->channel_layouts[i] = b->channel_layouts[j] = 0;
+ }
+ }
+ }
+ /* 1st round: a[known] intersect b[generic]
+ 2nd round: a[generic] intersect b[known] */
+ for (round = 0; round < 2; round++) {
+ for (i = 0; i < a->nb_channel_layouts; i++) {
+ uint64_t fmt = a->channel_layouts[i], bfmt;
+ if (!fmt || !KNOWN(fmt))
+ continue;
+ bfmt = FF_COUNT2LAYOUT(av_get_channel_layout_nb_channels(fmt));
+ for (j = 0; j < b->nb_channel_layouts; j++)
+ if (b->channel_layouts[j] == bfmt)
+ ret->channel_layouts[ret_nb++] = a->channel_layouts[i];
+ }
+ /* 1st round: swap to prepare 2nd round; 2nd round: put it back */
+ FFSWAP(AVFilterChannelLayouts *, a, b);
+ }
+ /* a[generic] intersect b[generic] */
+ for (i = 0; i < a->nb_channel_layouts; i++) {
+ if (KNOWN(a->channel_layouts[i]))
+ continue;
+ for (j = 0; j < b->nb_channel_layouts; j++)
+ if (a->channel_layouts[i] == b->channel_layouts[j])
+ ret->channel_layouts[ret_nb++] = a->channel_layouts[i];
+ }
+
+ ret->nb_channel_layouts = ret_nb;
+ if (!ret->nb_channel_layouts)
+ goto fail;
+ MERGE_REF(ret, a, channel_layouts, AVFilterChannelLayouts, fail);
+ MERGE_REF(ret, b, channel_layouts, AVFilterChannelLayouts, fail);
return ret;
+
fail:
if (ret) {
av_freep(&ret->refs);
@@ -248,17 +307,19 @@ do { \
\
(*f)->list = fmts; \
(*f)->list[(*f)->nb++] = fmt; \
- return 0; \
} while (0)
int ff_add_format(AVFilterFormats **avff, int64_t fmt)
{
ADD_FORMAT(avff, fmt, int, formats, format_count);
+ return 0;
}
int ff_add_channel_layout(AVFilterChannelLayouts **l, uint64_t channel_layout)
{
+ av_assert1(!(*l && (*l)->all_layouts));
ADD_FORMAT(l, channel_layout, uint64_t, channel_layouts, nb_channel_layouts);
+ return 0;
}
AVFilterFormats *ff_all_formats(enum AVMediaType type)
@@ -309,6 +370,9 @@ AVFilterFormats *ff_all_samplerates(void)
AVFilterChannelLayouts *ff_all_channel_layouts(void)
{
AVFilterChannelLayouts *ret = av_mallocz(sizeof(*ret));
+ if (!ret)
+ return NULL;
+ ret->all_layouts = 1;
return ret;
}
diff --git a/libavfilter/formats.h b/libavfilter/formats.h
index c5a4e3d..dd52ec8 100644
--- a/libavfilter/formats.h
+++ b/libavfilter/formats.h
@@ -69,15 +69,46 @@ struct AVFilterFormats {
struct AVFilterFormats ***refs; ///< references to this list
};
+/**
+ * A list of supported channel layouts.
+ *
+ * The list works the same as AVFilterFormats, except for the following
+ * differences:
+ * - A list with all_layouts = 1 means all channel layouts with a known
+ * disposition; nb_channel_layouts must then be 0.
+ * - A list with all_counts = 1 means all channel counts, with a known or
+ * unknown disposition ; nb_channel_layouts must then be 0 and all_layouts 1.
+ * - The list must not contain a layout with a known disposition and a
+ * channel count with unknown disposition with the same number of channels
+ * (e.g. AV_CH_LAYOUT_STEREO and FF_COUNT2LAYOUT(2).
+ */
typedef struct AVFilterChannelLayouts {
uint64_t *channel_layouts; ///< list of channel layouts
int nb_channel_layouts; ///< number of channel layouts
+ char all_layouts; ///< accept any known channel layout
+ char all_counts; ///< accept any channel layout or count
unsigned refcount; ///< number of references to this list
struct AVFilterChannelLayouts ***refs; ///< references to this list
} AVFilterChannelLayouts;
/**
+ * Encode a channel count as a channel layout.
+ * FF_COUNT2LAYOUT(c) means any channel layout with c channels, with a known
+ * or unknown disposition.
+ * The result is only valid inside AVFilterChannelLayouts and immediately
+ * related functions.
+ */
+#define FF_COUNT2LAYOUT(c) (0x8000000000000000ULL | (c))
+
+/**
+ * Decode a channel count encoded as a channel layout.
+ * Return 0 if the channel layout was a real one.
+ */
+#define FF_LAYOUT2COUNT(l) (((l) & 0x8000000000000000ULL) ? \
+ (int)((l) & 0x7FFFFFFF) : 0)
+
+/**
* Return a channel layouts/samplerates list which contains the intersection of
* the layouts/samplerates of a and b. Also, all the references of a, all the
* references of b, and a and b themselves will be deallocated.
--
1.7.10.4
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