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-rw-r--r--media/ffvpx/libavcodec/cbs.c1028
1 files changed, 1028 insertions, 0 deletions
diff --git a/media/ffvpx/libavcodec/cbs.c b/media/ffvpx/libavcodec/cbs.c
new file mode 100644
index 0000000000..504197e06d
--- /dev/null
+++ b/media/ffvpx/libavcodec/cbs.c
@@ -0,0 +1,1028 @@
+/*
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <string.h>
+
+#include "config.h"
+
+#include "libavutil/avassert.h"
+#include "libavutil/buffer.h"
+#include "libavutil/common.h"
+#include "libavutil/opt.h"
+
+#include "avcodec.h"
+#include "cbs.h"
+#include "cbs_internal.h"
+
+
+static const CodedBitstreamType *const cbs_type_table[] = {
+#if CONFIG_CBS_AV1
+ &ff_cbs_type_av1,
+#endif
+#if CONFIG_CBS_H264
+ &ff_cbs_type_h264,
+#endif
+#if CONFIG_CBS_H265
+ &ff_cbs_type_h265,
+#endif
+#if CONFIG_CBS_JPEG
+ &ff_cbs_type_jpeg,
+#endif
+#if CONFIG_CBS_MPEG2
+ &ff_cbs_type_mpeg2,
+#endif
+#if CONFIG_CBS_VP9
+ &ff_cbs_type_vp9,
+#endif
+};
+
+const enum AVCodecID ff_cbs_all_codec_ids[] = {
+#if CONFIG_CBS_AV1
+ AV_CODEC_ID_AV1,
+#endif
+#if CONFIG_CBS_H264
+ AV_CODEC_ID_H264,
+#endif
+#if CONFIG_CBS_H265
+ AV_CODEC_ID_H265,
+#endif
+#if CONFIG_CBS_JPEG
+ AV_CODEC_ID_MJPEG,
+#endif
+#if CONFIG_CBS_MPEG2
+ AV_CODEC_ID_MPEG2VIDEO,
+#endif
+#if CONFIG_CBS_VP9
+ AV_CODEC_ID_VP9,
+#endif
+ AV_CODEC_ID_NONE
+};
+
+av_cold int ff_cbs_init(CodedBitstreamContext **ctx_ptr,
+ enum AVCodecID codec_id, void *log_ctx)
+{
+ CodedBitstreamContext *ctx;
+ const CodedBitstreamType *type;
+ int i;
+
+ type = NULL;
+ for (i = 0; i < FF_ARRAY_ELEMS(cbs_type_table); i++) {
+ if (cbs_type_table[i]->codec_id == codec_id) {
+ type = cbs_type_table[i];
+ break;
+ }
+ }
+ if (!type)
+ return AVERROR(EINVAL);
+
+ ctx = av_mallocz(sizeof(*ctx));
+ if (!ctx)
+ return AVERROR(ENOMEM);
+
+ ctx->log_ctx = log_ctx;
+ ctx->codec = type; /* Must be before any error */
+
+ if (type->priv_data_size) {
+ ctx->priv_data = av_mallocz(ctx->codec->priv_data_size);
+ if (!ctx->priv_data) {
+ av_freep(&ctx);
+ return AVERROR(ENOMEM);
+ }
+ if (type->priv_class) {
+ *(const AVClass **)ctx->priv_data = type->priv_class;
+ av_opt_set_defaults(ctx->priv_data);
+ }
+ }
+
+ ctx->decompose_unit_types = NULL;
+
+ ctx->trace_enable = 0;
+ ctx->trace_level = AV_LOG_TRACE;
+
+ *ctx_ptr = ctx;
+ return 0;
+}
+
+av_cold void ff_cbs_flush(CodedBitstreamContext *ctx)
+{
+ if (ctx->codec->flush)
+ ctx->codec->flush(ctx);
+}
+
+av_cold void ff_cbs_close(CodedBitstreamContext **ctx_ptr)
+{
+ CodedBitstreamContext *ctx = *ctx_ptr;
+
+ if (!ctx)
+ return;
+
+ if (ctx->codec->close)
+ ctx->codec->close(ctx);
+
+ av_freep(&ctx->write_buffer);
+
+ if (ctx->codec->priv_class && ctx->priv_data)
+ av_opt_free(ctx->priv_data);
+
+ av_freep(&ctx->priv_data);
+ av_freep(ctx_ptr);
+}
+
+static void cbs_unit_uninit(CodedBitstreamUnit *unit)
+{
+ av_buffer_unref(&unit->content_ref);
+ unit->content = NULL;
+
+ av_buffer_unref(&unit->data_ref);
+ unit->data = NULL;
+ unit->data_size = 0;
+ unit->data_bit_padding = 0;
+}
+
+void ff_cbs_fragment_reset(CodedBitstreamFragment *frag)
+{
+ int i;
+
+ for (i = 0; i < frag->nb_units; i++)
+ cbs_unit_uninit(&frag->units[i]);
+ frag->nb_units = 0;
+
+ av_buffer_unref(&frag->data_ref);
+ frag->data = NULL;
+ frag->data_size = 0;
+ frag->data_bit_padding = 0;
+}
+
+av_cold void ff_cbs_fragment_free(CodedBitstreamFragment *frag)
+{
+ ff_cbs_fragment_reset(frag);
+
+ av_freep(&frag->units);
+ frag->nb_units_allocated = 0;
+}
+
+static int cbs_read_fragment_content(CodedBitstreamContext *ctx,
+ CodedBitstreamFragment *frag)
+{
+ int err, i, j;
+
+ for (i = 0; i < frag->nb_units; i++) {
+ CodedBitstreamUnit *unit = &frag->units[i];
+
+ if (ctx->decompose_unit_types) {
+ for (j = 0; j < ctx->nb_decompose_unit_types; j++) {
+ if (ctx->decompose_unit_types[j] == unit->type)
+ break;
+ }
+ if (j >= ctx->nb_decompose_unit_types)
+ continue;
+ }
+
+ av_buffer_unref(&unit->content_ref);
+ unit->content = NULL;
+
+ av_assert0(unit->data && unit->data_ref);
+
+ err = ctx->codec->read_unit(ctx, unit);
+ if (err == AVERROR(ENOSYS)) {
+ av_log(ctx->log_ctx, AV_LOG_VERBOSE,
+ "Decomposition unimplemented for unit %d "
+ "(type %"PRIu32").\n", i, unit->type);
+ } else if (err == AVERROR(EAGAIN)) {
+ av_log(ctx->log_ctx, AV_LOG_VERBOSE,
+ "Skipping decomposition of unit %d "
+ "(type %"PRIu32").\n", i, unit->type);
+ av_buffer_unref(&unit->content_ref);
+ unit->content = NULL;
+ } else if (err < 0) {
+ av_log(ctx->log_ctx, AV_LOG_ERROR, "Failed to read unit %d "
+ "(type %"PRIu32").\n", i, unit->type);
+ return err;
+ }
+ }
+
+ return 0;
+}
+
+static int cbs_fill_fragment_data(CodedBitstreamFragment *frag,
+ const uint8_t *data, size_t size)
+{
+ av_assert0(!frag->data && !frag->data_ref);
+
+ frag->data_ref =
+ av_buffer_alloc(size + AV_INPUT_BUFFER_PADDING_SIZE);
+ if (!frag->data_ref)
+ return AVERROR(ENOMEM);
+
+ frag->data = frag->data_ref->data;
+ frag->data_size = size;
+
+ memcpy(frag->data, data, size);
+ memset(frag->data + size, 0,
+ AV_INPUT_BUFFER_PADDING_SIZE);
+
+ return 0;
+}
+
+static int cbs_read_data(CodedBitstreamContext *ctx,
+ CodedBitstreamFragment *frag,
+ AVBufferRef *buf,
+ const uint8_t *data, size_t size,
+ int header)
+{
+ int err;
+
+ if (buf) {
+ frag->data_ref = av_buffer_ref(buf);
+ if (!frag->data_ref)
+ return AVERROR(ENOMEM);
+
+ frag->data = (uint8_t *)data;
+ frag->data_size = size;
+
+ } else {
+ err = cbs_fill_fragment_data(frag, data, size);
+ if (err < 0)
+ return err;
+ }
+
+ err = ctx->codec->split_fragment(ctx, frag, header);
+ if (err < 0)
+ return err;
+
+ return cbs_read_fragment_content(ctx, frag);
+}
+
+int ff_cbs_read_extradata(CodedBitstreamContext *ctx,
+ CodedBitstreamFragment *frag,
+ const AVCodecParameters *par)
+{
+ return cbs_read_data(ctx, frag, NULL,
+ par->extradata,
+ par->extradata_size, 1);
+}
+
+int ff_cbs_read_extradata_from_codec(CodedBitstreamContext *ctx,
+ CodedBitstreamFragment *frag,
+ const AVCodecContext *avctx)
+{
+ return cbs_read_data(ctx, frag, NULL,
+ avctx->extradata,
+ avctx->extradata_size, 1);
+}
+
+int ff_cbs_read_packet(CodedBitstreamContext *ctx,
+ CodedBitstreamFragment *frag,
+ const AVPacket *pkt)
+{
+ return cbs_read_data(ctx, frag, pkt->buf,
+ pkt->data, pkt->size, 0);
+}
+
+int ff_cbs_read_packet_side_data(CodedBitstreamContext *ctx,
+ CodedBitstreamFragment *frag,
+ const AVPacket *pkt)
+{
+ size_t side_data_size;
+ const uint8_t *side_data =
+ av_packet_get_side_data(pkt, AV_PKT_DATA_NEW_EXTRADATA,
+ &side_data_size);
+
+ return cbs_read_data(ctx, frag, NULL,
+ side_data, side_data_size, 1);
+}
+
+int ff_cbs_read(CodedBitstreamContext *ctx,
+ CodedBitstreamFragment *frag,
+ const uint8_t *data, size_t size)
+{
+ return cbs_read_data(ctx, frag, NULL,
+ data, size, 0);
+}
+
+/**
+ * Allocate a new internal data buffer of the given size in the unit.
+ *
+ * The data buffer will have input padding.
+ */
+static int cbs_alloc_unit_data(CodedBitstreamUnit *unit,
+ size_t size)
+{
+ av_assert0(!unit->data && !unit->data_ref);
+
+ unit->data_ref = av_buffer_alloc(size + AV_INPUT_BUFFER_PADDING_SIZE);
+ if (!unit->data_ref)
+ return AVERROR(ENOMEM);
+
+ unit->data = unit->data_ref->data;
+ unit->data_size = size;
+
+ memset(unit->data + size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
+
+ return 0;
+}
+
+static int cbs_write_unit_data(CodedBitstreamContext *ctx,
+ CodedBitstreamUnit *unit)
+{
+ PutBitContext pbc;
+ int ret;
+
+ if (!ctx->write_buffer) {
+ // Initial write buffer size is 1MB.
+ ctx->write_buffer_size = 1024 * 1024;
+
+ reallocate_and_try_again:
+ ret = av_reallocp(&ctx->write_buffer, ctx->write_buffer_size);
+ if (ret < 0) {
+ av_log(ctx->log_ctx, AV_LOG_ERROR, "Unable to allocate a "
+ "sufficiently large write buffer (last attempt "
+ "%"SIZE_SPECIFIER" bytes).\n", ctx->write_buffer_size);
+ return ret;
+ }
+ }
+
+ init_put_bits(&pbc, ctx->write_buffer, ctx->write_buffer_size);
+
+ ret = ctx->codec->write_unit(ctx, unit, &pbc);
+ if (ret < 0) {
+ if (ret == AVERROR(ENOSPC)) {
+ // Overflow.
+ if (ctx->write_buffer_size == INT_MAX / 8)
+ return AVERROR(ENOMEM);
+ ctx->write_buffer_size = FFMIN(2 * ctx->write_buffer_size, INT_MAX / 8);
+ goto reallocate_and_try_again;
+ }
+ // Write failed for some other reason.
+ return ret;
+ }
+
+ // Overflow but we didn't notice.
+ av_assert0(put_bits_count(&pbc) <= 8 * ctx->write_buffer_size);
+
+ if (put_bits_count(&pbc) % 8)
+ unit->data_bit_padding = 8 - put_bits_count(&pbc) % 8;
+ else
+ unit->data_bit_padding = 0;
+
+ flush_put_bits(&pbc);
+
+ ret = cbs_alloc_unit_data(unit, put_bytes_output(&pbc));
+ if (ret < 0)
+ return ret;
+
+ memcpy(unit->data, ctx->write_buffer, unit->data_size);
+
+ return 0;
+}
+
+int ff_cbs_write_fragment_data(CodedBitstreamContext *ctx,
+ CodedBitstreamFragment *frag)
+{
+ int err, i;
+
+ for (i = 0; i < frag->nb_units; i++) {
+ CodedBitstreamUnit *unit = &frag->units[i];
+
+ if (!unit->content)
+ continue;
+
+ av_buffer_unref(&unit->data_ref);
+ unit->data = NULL;
+
+ err = cbs_write_unit_data(ctx, unit);
+ if (err < 0) {
+ av_log(ctx->log_ctx, AV_LOG_ERROR, "Failed to write unit %d "
+ "(type %"PRIu32").\n", i, unit->type);
+ return err;
+ }
+ av_assert0(unit->data && unit->data_ref);
+ }
+
+ av_buffer_unref(&frag->data_ref);
+ frag->data = NULL;
+
+ err = ctx->codec->assemble_fragment(ctx, frag);
+ if (err < 0) {
+ av_log(ctx->log_ctx, AV_LOG_ERROR, "Failed to assemble fragment.\n");
+ return err;
+ }
+ av_assert0(frag->data && frag->data_ref);
+
+ return 0;
+}
+
+int ff_cbs_write_extradata(CodedBitstreamContext *ctx,
+ AVCodecParameters *par,
+ CodedBitstreamFragment *frag)
+{
+ int err;
+
+ err = ff_cbs_write_fragment_data(ctx, frag);
+ if (err < 0)
+ return err;
+
+ av_freep(&par->extradata);
+ par->extradata_size = 0;
+
+ if (!frag->data_size)
+ return 0;
+
+ par->extradata = av_malloc(frag->data_size +
+ AV_INPUT_BUFFER_PADDING_SIZE);
+ if (!par->extradata)
+ return AVERROR(ENOMEM);
+
+ memcpy(par->extradata, frag->data, frag->data_size);
+ memset(par->extradata + frag->data_size, 0,
+ AV_INPUT_BUFFER_PADDING_SIZE);
+ par->extradata_size = frag->data_size;
+
+ return 0;
+}
+
+int ff_cbs_write_packet(CodedBitstreamContext *ctx,
+ AVPacket *pkt,
+ CodedBitstreamFragment *frag)
+{
+ AVBufferRef *buf;
+ int err;
+
+ err = ff_cbs_write_fragment_data(ctx, frag);
+ if (err < 0)
+ return err;
+
+ buf = av_buffer_ref(frag->data_ref);
+ if (!buf)
+ return AVERROR(ENOMEM);
+
+ av_buffer_unref(&pkt->buf);
+
+ pkt->buf = buf;
+ pkt->data = frag->data;
+ pkt->size = frag->data_size;
+
+ return 0;
+}
+
+
+void ff_cbs_trace_header(CodedBitstreamContext *ctx,
+ const char *name)
+{
+ if (!ctx->trace_enable)
+ return;
+
+ av_log(ctx->log_ctx, ctx->trace_level, "%s\n", name);
+}
+
+void ff_cbs_trace_syntax_element(CodedBitstreamContext *ctx, int position,
+ const char *str, const int *subscripts,
+ const char *bits, int64_t value)
+{
+ char name[256];
+ size_t name_len, bits_len;
+ int pad, subs, i, j, k, n;
+
+ if (!ctx->trace_enable)
+ return;
+
+ av_assert0(value >= INT_MIN && value <= UINT32_MAX);
+
+ subs = subscripts ? subscripts[0] : 0;
+ n = 0;
+ for (i = j = 0; str[i];) {
+ if (str[i] == '[') {
+ if (n < subs) {
+ ++n;
+ k = snprintf(name + j, sizeof(name) - j, "[%d", subscripts[n]);
+ av_assert0(k > 0 && j + k < sizeof(name));
+ j += k;
+ for (++i; str[i] && str[i] != ']'; i++);
+ av_assert0(str[i] == ']');
+ } else {
+ while (str[i] && str[i] != ']')
+ name[j++] = str[i++];
+ av_assert0(str[i] == ']');
+ }
+ } else {
+ av_assert0(j + 1 < sizeof(name));
+ name[j++] = str[i++];
+ }
+ }
+ av_assert0(j + 1 < sizeof(name));
+ name[j] = 0;
+ av_assert0(n == subs);
+
+ name_len = strlen(name);
+ bits_len = strlen(bits);
+
+ if (name_len + bits_len > 60)
+ pad = bits_len + 2;
+ else
+ pad = 61 - name_len;
+
+ av_log(ctx->log_ctx, ctx->trace_level, "%-10d %s%*s = %"PRId64"\n",
+ position, name, pad, bits, value);
+}
+
+int ff_cbs_read_unsigned(CodedBitstreamContext *ctx, GetBitContext *gbc,
+ int width, const char *name,
+ const int *subscripts, uint32_t *write_to,
+ uint32_t range_min, uint32_t range_max)
+{
+ uint32_t value;
+ int position;
+
+ av_assert0(width > 0 && width <= 32);
+
+ if (get_bits_left(gbc) < width) {
+ av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid value at "
+ "%s: bitstream ended.\n", name);
+ return AVERROR_INVALIDDATA;
+ }
+
+ if (ctx->trace_enable)
+ position = get_bits_count(gbc);
+
+ value = get_bits_long(gbc, width);
+
+ if (ctx->trace_enable) {
+ char bits[33];
+ int i;
+ for (i = 0; i < width; i++)
+ bits[i] = value >> (width - i - 1) & 1 ? '1' : '0';
+ bits[i] = 0;
+
+ ff_cbs_trace_syntax_element(ctx, position, name, subscripts,
+ bits, value);
+ }
+
+ if (value < range_min || value > range_max) {
+ av_log(ctx->log_ctx, AV_LOG_ERROR, "%s out of range: "
+ "%"PRIu32", but must be in [%"PRIu32",%"PRIu32"].\n",
+ name, value, range_min, range_max);
+ return AVERROR_INVALIDDATA;
+ }
+
+ *write_to = value;
+ return 0;
+}
+
+int ff_cbs_write_unsigned(CodedBitstreamContext *ctx, PutBitContext *pbc,
+ int width, const char *name,
+ const int *subscripts, uint32_t value,
+ uint32_t range_min, uint32_t range_max)
+{
+ av_assert0(width > 0 && width <= 32);
+
+ if (value < range_min || value > range_max) {
+ av_log(ctx->log_ctx, AV_LOG_ERROR, "%s out of range: "
+ "%"PRIu32", but must be in [%"PRIu32",%"PRIu32"].\n",
+ name, value, range_min, range_max);
+ return AVERROR_INVALIDDATA;
+ }
+
+ if (put_bits_left(pbc) < width)
+ return AVERROR(ENOSPC);
+
+ if (ctx->trace_enable) {
+ char bits[33];
+ int i;
+ for (i = 0; i < width; i++)
+ bits[i] = value >> (width - i - 1) & 1 ? '1' : '0';
+ bits[i] = 0;
+
+ ff_cbs_trace_syntax_element(ctx, put_bits_count(pbc),
+ name, subscripts, bits, value);
+ }
+
+ if (width < 32)
+ put_bits(pbc, width, value);
+ else
+ put_bits32(pbc, value);
+
+ return 0;
+}
+
+int ff_cbs_read_signed(CodedBitstreamContext *ctx, GetBitContext *gbc,
+ int width, const char *name,
+ const int *subscripts, int32_t *write_to,
+ int32_t range_min, int32_t range_max)
+{
+ int32_t value;
+ int position;
+
+ av_assert0(width > 0 && width <= 32);
+
+ if (get_bits_left(gbc) < width) {
+ av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid value at "
+ "%s: bitstream ended.\n", name);
+ return AVERROR_INVALIDDATA;
+ }
+
+ if (ctx->trace_enable)
+ position = get_bits_count(gbc);
+
+ value = get_sbits_long(gbc, width);
+
+ if (ctx->trace_enable) {
+ char bits[33];
+ int i;
+ for (i = 0; i < width; i++)
+ bits[i] = value & (1U << (width - i - 1)) ? '1' : '0';
+ bits[i] = 0;
+
+ ff_cbs_trace_syntax_element(ctx, position, name, subscripts,
+ bits, value);
+ }
+
+ if (value < range_min || value > range_max) {
+ av_log(ctx->log_ctx, AV_LOG_ERROR, "%s out of range: "
+ "%"PRId32", but must be in [%"PRId32",%"PRId32"].\n",
+ name, value, range_min, range_max);
+ return AVERROR_INVALIDDATA;
+ }
+
+ *write_to = value;
+ return 0;
+}
+
+int ff_cbs_write_signed(CodedBitstreamContext *ctx, PutBitContext *pbc,
+ int width, const char *name,
+ const int *subscripts, int32_t value,
+ int32_t range_min, int32_t range_max)
+{
+ av_assert0(width > 0 && width <= 32);
+
+ if (value < range_min || value > range_max) {
+ av_log(ctx->log_ctx, AV_LOG_ERROR, "%s out of range: "
+ "%"PRId32", but must be in [%"PRId32",%"PRId32"].\n",
+ name, value, range_min, range_max);
+ return AVERROR_INVALIDDATA;
+ }
+
+ if (put_bits_left(pbc) < width)
+ return AVERROR(ENOSPC);
+
+ if (ctx->trace_enable) {
+ char bits[33];
+ int i;
+ for (i = 0; i < width; i++)
+ bits[i] = value & (1U << (width - i - 1)) ? '1' : '0';
+ bits[i] = 0;
+
+ ff_cbs_trace_syntax_element(ctx, put_bits_count(pbc),
+ name, subscripts, bits, value);
+ }
+
+ if (width < 32)
+ put_sbits(pbc, width, value);
+ else
+ put_bits32(pbc, value);
+
+ return 0;
+}
+
+
+static int cbs_insert_unit(CodedBitstreamFragment *frag,
+ int position)
+{
+ CodedBitstreamUnit *units;
+
+ if (frag->nb_units < frag->nb_units_allocated) {
+ units = frag->units;
+
+ if (position < frag->nb_units)
+ memmove(units + position + 1, units + position,
+ (frag->nb_units - position) * sizeof(*units));
+ } else {
+ units = av_malloc_array(frag->nb_units*2 + 1, sizeof(*units));
+ if (!units)
+ return AVERROR(ENOMEM);
+
+ frag->nb_units_allocated = 2*frag->nb_units_allocated + 1;
+
+ if (position > 0)
+ memcpy(units, frag->units, position * sizeof(*units));
+
+ if (position < frag->nb_units)
+ memcpy(units + position + 1, frag->units + position,
+ (frag->nb_units - position) * sizeof(*units));
+ }
+
+ memset(units + position, 0, sizeof(*units));
+
+ if (units != frag->units) {
+ av_free(frag->units);
+ frag->units = units;
+ }
+
+ ++frag->nb_units;
+
+ return 0;
+}
+
+int ff_cbs_insert_unit_content(CodedBitstreamFragment *frag,
+ int position,
+ CodedBitstreamUnitType type,
+ void *content,
+ AVBufferRef *content_buf)
+{
+ CodedBitstreamUnit *unit;
+ AVBufferRef *content_ref;
+ int err;
+
+ if (position == -1)
+ position = frag->nb_units;
+ av_assert0(position >= 0 && position <= frag->nb_units);
+
+ if (content_buf) {
+ content_ref = av_buffer_ref(content_buf);
+ if (!content_ref)
+ return AVERROR(ENOMEM);
+ } else {
+ content_ref = NULL;
+ }
+
+ err = cbs_insert_unit(frag, position);
+ if (err < 0) {
+ av_buffer_unref(&content_ref);
+ return err;
+ }
+
+ unit = &frag->units[position];
+ unit->type = type;
+ unit->content = content;
+ unit->content_ref = content_ref;
+
+ return 0;
+}
+
+static int cbs_insert_unit_data(CodedBitstreamFragment *frag,
+ CodedBitstreamUnitType type,
+ uint8_t *data, size_t data_size,
+ AVBufferRef *data_buf,
+ int position)
+{
+ CodedBitstreamUnit *unit;
+ AVBufferRef *data_ref;
+ int err;
+
+ av_assert0(position >= 0 && position <= frag->nb_units);
+
+ if (data_buf)
+ data_ref = av_buffer_ref(data_buf);
+ else
+ data_ref = av_buffer_create(data, data_size, NULL, NULL, 0);
+ if (!data_ref) {
+ if (!data_buf)
+ av_free(data);
+ return AVERROR(ENOMEM);
+ }
+
+ err = cbs_insert_unit(frag, position);
+ if (err < 0) {
+ av_buffer_unref(&data_ref);
+ return err;
+ }
+
+ unit = &frag->units[position];
+ unit->type = type;
+ unit->data = data;
+ unit->data_size = data_size;
+ unit->data_ref = data_ref;
+
+ return 0;
+}
+
+int ff_cbs_append_unit_data(CodedBitstreamFragment *frag,
+ CodedBitstreamUnitType type,
+ uint8_t *data, size_t data_size,
+ AVBufferRef *data_buf)
+{
+ return cbs_insert_unit_data(frag, type,
+ data, data_size, data_buf,
+ frag->nb_units);
+}
+
+void ff_cbs_delete_unit(CodedBitstreamFragment *frag,
+ int position)
+{
+ av_assert0(0 <= position && position < frag->nb_units
+ && "Unit to be deleted not in fragment.");
+
+ cbs_unit_uninit(&frag->units[position]);
+
+ --frag->nb_units;
+
+ if (frag->nb_units > 0)
+ memmove(frag->units + position,
+ frag->units + position + 1,
+ (frag->nb_units - position) * sizeof(*frag->units));
+}
+
+static void cbs_default_free_unit_content(void *opaque, uint8_t *data)
+{
+ const CodedBitstreamUnitTypeDescriptor *desc = opaque;
+
+ for (int i = 0; i < desc->type.ref.nb_offsets; i++) {
+ void **ptr = (void**)(data + desc->type.ref.offsets[i]);
+ av_buffer_unref((AVBufferRef**)(ptr + 1));
+ }
+ av_free(data);
+}
+
+static const CodedBitstreamUnitTypeDescriptor
+ *cbs_find_unit_type_desc(CodedBitstreamContext *ctx,
+ CodedBitstreamUnit *unit)
+{
+ const CodedBitstreamUnitTypeDescriptor *desc;
+ int i, j;
+
+ if (!ctx->codec->unit_types)
+ return NULL;
+
+ for (i = 0;; i++) {
+ desc = &ctx->codec->unit_types[i];
+ if (desc->nb_unit_types == 0)
+ break;
+ if (desc->nb_unit_types == CBS_UNIT_TYPE_RANGE) {
+ if (unit->type >= desc->unit_type.range.start &&
+ unit->type <= desc->unit_type.range.end)
+ return desc;
+ } else {
+ for (j = 0; j < desc->nb_unit_types; j++) {
+ if (desc->unit_type.list[j] == unit->type)
+ return desc;
+ }
+ }
+ }
+ return NULL;
+}
+
+int ff_cbs_alloc_unit_content(CodedBitstreamContext *ctx,
+ CodedBitstreamUnit *unit)
+{
+ const CodedBitstreamUnitTypeDescriptor *desc;
+
+ av_assert0(!unit->content && !unit->content_ref);
+
+ desc = cbs_find_unit_type_desc(ctx, unit);
+ if (!desc)
+ return AVERROR(ENOSYS);
+
+ unit->content = av_mallocz(desc->content_size);
+ if (!unit->content)
+ return AVERROR(ENOMEM);
+
+ unit->content_ref =
+ av_buffer_create(unit->content, desc->content_size,
+ desc->content_type == CBS_CONTENT_TYPE_COMPLEX
+ ? desc->type.complex.content_free
+ : cbs_default_free_unit_content,
+ (void*)desc, 0);
+ if (!unit->content_ref) {
+ av_freep(&unit->content);
+ return AVERROR(ENOMEM);
+ }
+
+ return 0;
+}
+
+static int cbs_clone_internal_refs_unit_content(AVBufferRef **clone_ref,
+ const CodedBitstreamUnit *unit,
+ const CodedBitstreamUnitTypeDescriptor *desc)
+{
+ const uint8_t *src;
+ uint8_t *copy;
+ int err, i;
+
+ av_assert0(unit->content);
+ src = unit->content;
+
+ copy = av_memdup(src, desc->content_size);
+ if (!copy)
+ return AVERROR(ENOMEM);
+
+ for (i = 0; i < desc->type.ref.nb_offsets; i++) {
+ const uint8_t *const *src_ptr = (const uint8_t* const*)(src + desc->type.ref.offsets[i]);
+ const AVBufferRef *src_buf = *(AVBufferRef**)(src_ptr + 1);
+ uint8_t **copy_ptr = (uint8_t**)(copy + desc->type.ref.offsets[i]);
+ AVBufferRef **copy_buf = (AVBufferRef**)(copy_ptr + 1);
+
+ if (!*src_ptr) {
+ av_assert0(!src_buf);
+ continue;
+ }
+ if (!src_buf) {
+ // We can't handle a non-refcounted pointer here - we don't
+ // have enough information to handle whatever structure lies
+ // at the other end of it.
+ err = AVERROR(EINVAL);
+ goto fail;
+ }
+
+ *copy_buf = av_buffer_ref(src_buf);
+ if (!*copy_buf) {
+ err = AVERROR(ENOMEM);
+ goto fail;
+ }
+ }
+
+ *clone_ref = av_buffer_create(copy, desc->content_size,
+ cbs_default_free_unit_content,
+ (void*)desc, 0);
+ if (!*clone_ref) {
+ err = AVERROR(ENOMEM);
+ goto fail;
+ }
+
+ return 0;
+
+fail:
+ for (--i; i >= 0; i--)
+ av_buffer_unref((AVBufferRef**)(copy + desc->type.ref.offsets[i]));
+ av_freep(&copy);
+ *clone_ref = NULL;
+ return err;
+}
+
+/*
+ * On success, unit->content and unit->content_ref are updated with
+ * the new content; unit is untouched on failure.
+ * Any old content_ref is simply overwritten and not freed.
+ */
+static int cbs_clone_unit_content(CodedBitstreamContext *ctx,
+ CodedBitstreamUnit *unit)
+{
+ const CodedBitstreamUnitTypeDescriptor *desc;
+ AVBufferRef *ref;
+ int err;
+
+ desc = cbs_find_unit_type_desc(ctx, unit);
+ if (!desc)
+ return AVERROR(ENOSYS);
+
+ switch (desc->content_type) {
+ case CBS_CONTENT_TYPE_INTERNAL_REFS:
+ err = cbs_clone_internal_refs_unit_content(&ref, unit, desc);
+ break;
+
+ case CBS_CONTENT_TYPE_COMPLEX:
+ if (!desc->type.complex.content_clone)
+ return AVERROR_PATCHWELCOME;
+ err = desc->type.complex.content_clone(&ref, unit);
+ break;
+
+ default:
+ av_assert0(0 && "Invalid content type.");
+ }
+
+ if (err < 0)
+ return err;
+
+ unit->content_ref = ref;
+ unit->content = ref->data;
+ return 0;
+}
+
+int ff_cbs_make_unit_refcounted(CodedBitstreamContext *ctx,
+ CodedBitstreamUnit *unit)
+{
+ av_assert0(unit->content);
+ if (unit->content_ref)
+ return 0;
+ return cbs_clone_unit_content(ctx, unit);
+}
+
+int ff_cbs_make_unit_writable(CodedBitstreamContext *ctx,
+ CodedBitstreamUnit *unit)
+{
+ AVBufferRef *ref = unit->content_ref;
+ int err;
+
+ av_assert0(unit->content);
+ if (ref && av_buffer_is_writable(ref))
+ return 0;
+
+ err = cbs_clone_unit_content(ctx, unit);
+ if (err < 0)
+ return err;
+ av_buffer_unref(&ref);
+ return 0;
+}